fix woodpecker trigger

Reviewed-on: Deuxfleurs/tricot#11

.gitignore

@@ -1,3 +1,5 @@
 /target
+result
+result-bin
 run_local.sh
 dhat-heap.json

.woodpecker.yml

@@ -0,0 +1,26 @@
+when:
+  event:
+  - push
+  - pull_request
+  - tag
+  - cron
+  - manual
+
+steps:
+  - name: check formatting
+    image: nixpkgs/nix:nixos-22.05
+    environment:
+      NIX_PATH: 'nixpkgs=channel:nixos-22.05'
+    commands:
+      - nix-shell -p cargo -p rustfmt --run 'cargo fmt -- --check'
+
+  - name: build
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#debug.x86_64-linux.tricot
+
+  - name: test
+    image: nixpkgs/nix:nixos-22.05
+    commands:
+      - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#test.x86_64-linux.tricot
+      - ./result-bin/bin/tricot-*

Cargo.toml

@@ -7,34 +7,38 @@ authors = ["Alex Auvolat <alex@adnab.me>"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-anyhow = "1.0.28"
+anyhow = "1.0.66"
 envy = "0.4"
 futures = "0.3"
-log = "0.4"
-pretty_env_logger = "0.4"
+tracing = { version = "0.1.30" }
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 regex = "1"
 reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls-manual-roots" ] }
-serde = { version = "1.0.107", features = ["derive"] }
-serde_json = "1.0.53"
-tokio = { version = "1.0", default-features = false, features = ["rt", "rt-multi-thread", "io-util", "net", "time", "macros", "sync", "signal", "fs"] }
+serde = { version = "1.0.149", features = ["derive"] }
+serde_json = "1.0.89"
+tokio = { version = "1.22", default-features = false, features = ["rt", "rt-multi-thread", "io-util", "net", "time", "macros", "sync", "signal", "fs"] }
 bytes = "1"
 acme-micro = "0.12"
-rustls = { version =  "0.20", features = [ "dangerous_configuration" ] }
-rustls-pemfile = "0.2"
+rustls = { version =  "0.21", features = [ "dangerous_configuration" ] }
+rustls-pemfile = "1.0"
 chrono = { version = "0.4", features = [ "serde" ] }
 hyper = { version = "0.14", features = [ "full" ] }
 futures-util = "0.3"
-tokio-rustls = "0.23"
-hyper-rustls = "0.23"
+tokio-rustls = "0.24"
+hyper-rustls = "0.24"
 http = "0.2"
-hyper-reverse-proxy = "0.4"
 structopt = "0.3"
 glob = "0.3"
-rcgen = "0.8"
+rcgen = "0.11"
 accept-encoding-fork = "0.2.0-alpha.3"
-async-compression = { version = "0.3", features = ["tokio", "gzip", "zstd", "deflate", "brotli"] }
-tokio-util = { version = "0.6", features = ["io"] }
-uuid = { version = "0.8.2", features = ["v4"] }
+async-compression = { version = "0.4", features = ["tokio", "gzip", "zstd", "deflate", "brotli"] }
+tokio-util = { version = "0.7", features = ["io"] }
+uuid = { version = "1.2", features = ["v4"] }
+opentelemetry = "0.20"
+opentelemetry-prometheus = "0.13"
+prometheus = "0.13"
+df-consul = "0.3.5"
+
 dhat = { version = "0.3", optional = true }
 
 [profile.release]

Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.58-buster as builder
+FROM rust:1.68-buster as builder
 
 RUN apt-get update && \
     apt-get install -y libssl-dev pkg-config

LICENSE

@@ -0,0 +1,661 @@
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+or that patent license was granted, prior to 28 March 2007.
+
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+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
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+
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+  Notwithstanding any other provision of this License, you have
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+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
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+GNU Affero General Public License, you may choose any version ever published
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
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+
+                     END OF TERMS AND CONDITIONS
+
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+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+to attach them to the start of each source file to most effectively
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+
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+    Copyright (C) <year>  <name of author>
+
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+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
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+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,5 +1,7 @@
 # Tricot
 
+[![status-badge](https://woodpecker.deuxfleurs.fr/api/badges/36/status.svg)](https://woodpecker.deuxfleurs.fr/repos/36)
+
 Tricot is a reverse-proxy for exposing your services via TLS that integrates well with Consul and Nomad.
 
 Tricot does the following things:
@@ -27,7 +29,8 @@ Tricot uses the following environment variables for its configuration (they can
 - `TRICOT_ENABLE_COMPRESSION` (default: `false`): whether to enable transparent compression of data coming back from backends
 - `TRICOT_COMPRESS_MIME_TYPES` (default: `text/html,text/plain,text/css,text/javascript,text/xml,application/javascript,application/json,application/xml,image/svg+xml,font/ttf`): comma-separated list of MIME types for which Tricot will do compression
 
-[Here is an example of how to run Tricot as a Nomad service](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/branch/main/app/frontend/deploy/frontend-tricot.hcl) (in this example it also integrates with [Diplonat](https://git.deuxfleurs.fr/Deuxfleurs/diplonat)).
+[Here is an example of how to run Tricot as a Nomad service](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/commit/1a11ff42029e0a6cb5f5b9c34043af9d6d52e5ab/cluster/prod/app/core/deploy/tricot.hcl)
+(in this example it also integrates with [Diplonat](https://git.deuxfleurs.fr/Deuxfleurs/diplonat)).
 
 ## Adding and priorizing backends
 
@@ -39,15 +42,16 @@ Backends are configured by adding tags of the following form to the services in
 - `tricot myapp.example.com/path/to_subresource 10`: combining the previous two examples
 - `tricot-https myapp.example.com`: same, but indicates that the backend service handling the request expects an HTTPS request and not an HTTP request. In this case, Tricot will do everything in its power to NOT verify the backend's TLS certificate (ignore self-signed certificate, ignore TLS hostname, etc).
 - `tricot-add-header Access-Control-Allow-Origin *`: add the `Access-Control-Allow-Origin: *` header to all of the HTTP responses when they are proxied back to the client
+- `tricot-add-redirect old.example.com/maybe_subpath new.example.com/new/subpath 301`: redirects paths that match the first pattern to the second pattern with the given HTTP status code. More info in [PR#10](https://git.deuxfleurs.fr/Deuxfleurs/tricot/pulls/10).
 - `tricot-global-lb`: load-balance incoming requests to all matching backends
 - `tricot-site-lb`: load-balance incoming requests to all matching backends that are in the same site (geographical location); when site information about nodes is not available, this is equivalent to `tricot-global-lb`
 
 Any number of such rules can be combined freely.
 
-[Here](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/branch/main/app/dummy/deploy/dummy-nginx.hcl)
-[are](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/branch/main/app/garage-staging/deploy/garage.hcl)
-[some](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/branch/main/app/im/deploy/im.hcl)
-[examples](https://git.deuxfleurs.fr/Deuxfleurs/infrastructure/src/branch/main/app/jitsi/deploy/jitsi.hcl).
+[Here](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/commit/981294e3d7a180a3c08f8173dc652b73b6e2bd07/cluster/staging/app/dummy/deploy/dummy-nginx.hcl)
+[are](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/commit/1a11ff42029e0a6cb5f5b9c34043af9d6d52e5ab/cluster/prod/app/garage/deploy/garage.hcl)
+[some](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/commit/1a11ff42029e0a6cb5f5b9c34043af9d6d52e5ab/cluster/prod/app/matrix/deploy/im.hcl)
+[examples](https://git.deuxfleurs.fr/Deuxfleurs/nixcfg/src/commit/1a11ff42029e0a6cb5f5b9c34043af9d6d52e5ab/cluster/prod/app/jitsi/deploy/jitsi.hcl).
 
 ## How Tricot matches backends
 
@@ -67,3 +71,8 @@ Logs are the privileged place to get information about what Tricot is doing. You
 - `RUST_LOG=tricot=info`: Tricot will dump the proxy configuration (the set of rules it uses to match backends) each time it changes, and will show a line for each incoming request (but it won't indicate which backend the request was routed to). You will also get information about certificate obtention and renewal using Let's Encrypt.
 - `RUST_LOG=tricot=debug`: Tricot will show for each request the backend to which it is routed. It will also show all of its interactions with Consul
 - `RUST_LOG=tricot=trace`: Tricot will show details such as the request's headers for all request at all stages of proxying.
+
+
+## License
+
+This software is published under the AGPLv3 license.

doc/Grafana Tricot global.json

@@ -0,0 +1,964 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_DS_PROMETHEUS",
+      "label": "DS_PROMETHEUS",
+      "description": "",
+      "type": "datasource",
+      "pluginId": "prometheus",
+      "pluginName": "Prometheus"
+    }
+  ],
+  "__elements": {},
+  "__requires": [
+    {
+      "type": "panel",
+      "id": "gauge",
+      "name": "Gauge",
+      "version": ""
+    },
+    {
+      "type": "grafana",
+      "id": "grafana",
+      "name": "Grafana",
+      "version": "9.3.1"
+    },
+    {
+      "type": "panel",
+      "id": "piechart",
+      "name": "Pie chart",
+      "version": ""
+    },
+    {
+      "type": "datasource",
+      "id": "prometheus",
+      "name": "Prometheus",
+      "version": "1.0.0"
+    },
+    {
+      "type": "panel",
+      "id": "timeseries",
+      "name": "Time series",
+      "version": ""
+    }
+  ],
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "target": {
+          "limit": 100,
+          "matchAny": false,
+          "tags": [],
+          "type": "dashboard"
+        },
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": false,
+  "fiscalYearStartMonth": 0,
+  "graphTooltip": 0,
+  "id": null,
+  "links": [],
+  "liveNow": false,
+  "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_DS_PROMETHEUS}"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [],
+          "max": 300,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "yellow",
+                "value": 100
+              },
+              {
+                "color": "red",
+                "value": 200
+              }
+            ]
+          },
+          "unit": "reqps"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 6,
+        "x": 0,
+        "y": 0
+      },
+      "id": 8,
+      "options": {
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "showThresholdLabels": false,
+        "showThresholdMarkers": true
+      },
+      "pluginVersion": "9.3.1",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum (rate(https_requests_served{job=\"tricot\"}[$__rate_interval]))",
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "__auto",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Request rate",
+      "type": "gauge"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_DS_PROMETHEUS}"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 0,
+            "gradientMode": "opacity",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          },
+          "unit": "s"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 6,
+        "x": 6,
+        "y": 0
+      },
+      "id": 14,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "pluginVersion": "9.2.6",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum(rate(https_request_proxy_duration_sum{job=\"tricot\"}[$__rate_interval])) / sum(rate(https_request_proxy_duration_count{job=\"tricot\"}[$__rate_interval]))",
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "Average",
+          "range": true,
+          "refId": "A"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "histogram_quantile(0.5, sum(rate(https_request_proxy_duration_bucket[$__rate_interval])) by (le))",
+          "hide": false,
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "50%",
+          "range": true,
+          "refId": "D"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "histogram_quantile(0.90, sum(rate(https_request_proxy_duration_bucket[$__rate_interval])) by (le))",
+          "hide": false,
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "90%",
+          "range": true,
+          "refId": "B"
+        },
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "histogram_quantile(0.99, sum(rate(https_request_proxy_duration_bucket[$__rate_interval])) by (le))",
+          "hide": false,
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "99%",
+          "range": true,
+          "refId": "C"
+        }
+      ],
+      "title": "Response time",
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_DS_PROMETHEUS}"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            }
+          },
+          "mappings": [],
+          "unit": "reqps"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 4,
+        "x": 12,
+        "y": 0
+      },
+      "id": 11,
+      "options": {
+        "displayLabels": [
+          "name"
+        ],
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": false
+        },
+        "pieType": "pie",
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "exemplar": false,
+          "expr": "sum by(service) (rate(https_requests_served{status_code=~\"2.+\", job=\"tricot\"}[$__range]))",
+          "instant": true,
+          "interval": "",
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "{{service}}",
+          "range": false,
+          "refId": "A"
+        }
+      ],
+      "title": "Requests per service",
+      "type": "piechart"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${DS_DS_PROMETHEUS}"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "bars",
+            "fillOpacity": 100,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "auto",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "normal"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          },
+          "unit": "reqps"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 8,
+        "x": 16,
+        "y": 0
+      },
+      "id": 4,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${DS_DS_PROMETHEUS}"
+          },
+          "editorMode": "code",
+          "expr": "sum by(method, status_code) (rate(https_requests_served{status_code=~\"2.+\", job=\"tricot\"}[$__rate_interval]))",
+          "instant": false,
+          "key": "Q-b2139746-a221-47de-a50b-fadc128d0021-0",
+          "legendFormat": "{{method}} {{status_code}}",
+          "range": true,
+          "refId": "A"
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doc/Grafana Tricot per-service.json

@@ -0,0 +1,994 @@
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+          "refId": "A"
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+}

flake.lock

@@ -0,0 +1,151 @@
+{
+  "nodes": {
+    "cargo2nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1666087781,
+        "narHash": "sha256-trKVdjMZ8mNkGfLcY5LsJJGtdV3xJDZnMVrkFjErlcs=",
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Alexis211",
+        "repo": "cargo2nix",
+        "rev": "a7a61179b66054904ef6a195d8da736eaaa06c36",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
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+        "narHash": "sha256-mgOzQYTvaTT4bFopVOadlndy2RPwLy60rDjIWOGujwo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f902cb49892d300ff15cb237e48aa1cad79d68c3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1665657542,
+        "narHash": "sha256-mojxNyzbvmp8NtVtxqiHGhRfjCALLfk9i/Uup68Y5q8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
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+      "original": {
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+        "repo": "nixpkgs",
+        "rev": "a3073c49bc0163fea6a121c276f526837672b555",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "cargo2nix": "cargo2nix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1682389182,
+        "narHash": "sha256-8t2nmFnH+8V48+IJsf8AK51ebXNlVbOSVYOpiqJKvJE=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
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+        "type": "github"
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+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/a3073c49bc0163fea6a121c276f526837672b555";
+  inputs.cargo2nix = {
+    # As of 2022-10-18: two small patches over unstable branch, one for clippy and one to fix feature detection
+    url = "github:Alexis211/cargo2nix/a7a61179b66054904ef6a195d8da736eaaa06c36";
+
+    # Rust overlay as of 2023-04-25
+    inputs.rust-overlay.url =
+      "github:oxalica/rust-overlay/74f1a64dd28faeeb85ef081f32cad2989850322c";
+
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, cargo2nix }:
+  let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      overlays = [ cargo2nix.overlays.default ];
+    };
+    packageFun = import ./Cargo.nix;
+    rustVersion = "1.68.0";
+
+    compile = args: compileMode:
+      let
+        packageSet = pkgs.rustBuilder.makePackageSet ({
+          inherit packageFun rustVersion;
+        } // args);
+      in
+        packageSet.workspace.tricot {
+          inherit compileMode;
+        };
+  in
+  {
+    test.x86_64-linux.tricot = compile { release = false; } "test";
+    debug.x86_64-linux.tricot = compile { release = false; } "build";
+    packages.x86_64-linux.tricot = compile { release = true; } "build";
+    packages.x86_64-linux.default = self.packages.x86_64-linux.tricot;
+  };
+}

src/cert.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 
 use anyhow::Result;
 
-use chrono::{Date, NaiveDate, Utc};
+use chrono::{NaiveDate, Utc};
 use rustls::sign::CertifiedKey;
 use serde::{Deserialize, Serialize};
 
@@ -54,8 +54,7 @@ impl Cert {
 	}
 
 	pub fn is_old(&self) -> bool {
-		let date = Date::<Utc>::from_utc(self.ser.date, Utc);
-		let today = Utc::today();
-		today - date > chrono::Duration::days(self.ser.valid_days / 2)
+		let today = Utc::now().date_naive();
+		today - self.ser.date > chrono::Duration::days(self.ser.valid_days / 2)
 	}
 }

src/cert_store.rs

@@ -5,31 +5,40 @@ use std::time::{Duration, Instant};
 use anyhow::Result;
 use chrono::Utc;
 use futures::{FutureExt, TryFutureExt};
-use log::*;
 use tokio::select;
 use tokio::sync::{mpsc, watch};
 use tokio::task::block_in_place;
+use tracing::*;
 
 use acme_micro::create_p384_key;
 use acme_micro::{Directory, DirectoryUrl};
 use rustls::sign::CertifiedKey;
 
 use crate::cert::{Cert, CertSer};
-use crate::consul::*;
+use crate::consul::{self, Consul};
 use crate::proxy_config::*;
 
 pub struct CertStore {
 	consul: Consul,
+	node_name: String,
 	letsencrypt_email: String,
+
 	certs: RwLock<HashMap<String, Arc<Cert>>>,
 	self_signed_certs: RwLock<HashMap<String, Arc<Cert>>>,
+
 	rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
 	tx_need_cert: mpsc::UnboundedSender<String>,
 }
 
+struct ProcessedDomains {
+	static_domains: HashSet<String>,
+	on_demand_domains: Vec<(glob::Pattern, Option<String>)>,
+}
+
 impl CertStore {
 	pub fn new(
 		consul: Consul,
+		node_name: String,
 		rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
 		letsencrypt_email: String,
 		exit_on_err: impl Fn(anyhow::Error) + Send + 'static,
@@ -38,10 +47,11 @@ impl CertStore {
 
 		let cert_store = Arc::new(Self {
 			consul,
+			node_name,
+			letsencrypt_email,
 			certs: RwLock::new(HashMap::new()),
 			self_signed_certs: RwLock::new(HashMap::new()),
 			rx_proxy_config,
-			letsencrypt_email,
 			tx_need_cert: tx,
 		});
 
@@ -63,46 +73,72 @@ impl CertStore {
 		let mut rx_proxy_config = self.rx_proxy_config.clone();
 
 		let mut t_last_check: HashMap<String, Instant> = HashMap::new();
+		let mut proc_domains: Option<ProcessedDomains> = None;
 
 		loop {
-			let mut domains: HashSet<String> = HashSet::new();
-
-			select! {
+			let domains = select! {
+				// Refresh some internal states, schedule static_domains for renew
 				res = rx_proxy_config.changed() => {
 					if res.is_err() {
 						bail!("rx_proxy_config closed");
 					}
 
+					let mut static_domains: HashSet<String> = HashSet::new();
+					let mut on_demand_domains: Vec<(glob::Pattern, Option<String>)> = vec![];
+
 					let proxy_config: Arc<ProxyConfig> = rx_proxy_config.borrow().clone();
+
 					for ent in proxy_config.entries.iter() {
-						if let HostDescription::Hostname(domain) = &ent.host {
-							if let Some((host, _port)) = domain.split_once(':') {
-								domains.insert(host.to_string());
-							} else {
-								domains.insert(domain.clone());
-							}
+						// Eagerly generate certificates for domains that
+						// are not patterns
+						match &ent.url_prefix.host {
+							HostDescription::Hostname(domain) => {
+								if let Some((host, _port)) = domain.split_once(':') {
+									static_domains.insert(host.to_string());
+								} else {
+									static_domains.insert(domain.clone());
+								}
+							},
+							HostDescription::Pattern(pattern) => {
+								on_demand_domains.push((pattern.clone(), ent.on_demand_tls_ask.clone()));
+							},
 						}
 					}
+
+					// only static_domains are refreshed
+					proc_domains = Some(ProcessedDomains { static_domains: static_domains.clone(), on_demand_domains });
+					self.domain_validation(static_domains, proc_domains.as_ref()).await
 				}
+				// renew static and on-demand domains
 				need_cert = rx_need_cert.recv() => {
 					match need_cert {
 						Some(dom) => {
-							domains.insert(dom);
+							let mut candidates: HashSet<String> = HashSet::new();
+
+							// collect certificates as much as possible
+							candidates.insert(dom);
 							while let Ok(dom2) = rx_need_cert.try_recv() {
-								domains.insert(dom2);
+								candidates.insert(dom2);
 							}
+
+							self.domain_validation(candidates, proc_domains.as_ref()).await
 						}
 						None => bail!("rx_need_cert closed"),
-					};
+					}
 				}
-			}
+			};
 
+			// Now that we have our list of domains to check,
+			// actually do something
 			for dom in domains.iter() {
+				// Exclude from the list domains that were checked less than 60
+				// seconds ago
 				match t_last_check.get(dom) {
 					Some(t) if Instant::now() - *t < Duration::from_secs(60) => continue,
 					_ => t_last_check.insert(dom.to_string(), Instant::now()),
 				};
 
+				// Actual Let's Encrypt calls are done here (in sister function)
 				debug!("Checking cert for domain: {}", dom);
 				if let Err(e) = self.check_cert(dom).await {
 					warn!("({}) Could not get certificate: {}", dom, e);
@@ -111,18 +147,82 @@ impl CertStore {
 		}
 	}
 
-	fn get_cert_for_https(self: &Arc<Self>, domain: &str) -> Result<Arc<Cert>> {
-		// Check if domain is authorized
-		if !self
-			.rx_proxy_config
-			.borrow()
-			.entries
-			.iter()
-			.any(|ent| ent.host.matches(domain))
-		{
-			bail!("Domain {} should not have a TLS certificate.", domain);
+	async fn domain_validation(
+		&self,
+		candidates: HashSet<String>,
+		maybe_proc_domains: Option<&ProcessedDomains>,
+	) -> HashSet<String> {
+		let mut domains: HashSet<String> = HashSet::new();
+
+		// Handle initialization
+		let proc_domains = match maybe_proc_domains {
+			None => {
+				warn!("Proxy config is not yet loaded, refusing all certificate generation");
+				return domains;
+			}
+			Some(proc) => proc,
+		};
+
+		// Filter certificates...
+		'outer: for candidate in candidates.into_iter() {
+			// Disallow obvious wrong domains...
+			if !candidate.contains('.') || candidate.ends_with(".local") {
+				warn!("{} is probably not a publicly accessible domain, skipping (a self-signed certificate will be used)", candidate);
+				continue;
+			}
+
+			// Try to register domain as a static domain
+			if proc_domains.static_domains.contains(&candidate) {
+				trace!("domain {} validated as static domain", candidate);
+				domains.insert(candidate);
+				continue;
+			}
+
+			// It's not a static domain, maybe an on-demand domain?
+			for (pattern, maybe_check_url) in proc_domains.on_demand_domains.iter() {
+				// check glob pattern
+				if pattern.matches(&candidate) {
+					// if no check url is set, accept domain as long as it matches the pattern
+					let check_url = match maybe_check_url {
+						None => {
+							trace!(
+								"domain {} validated on glob pattern {} only",
+								candidate,
+								pattern
+							);
+							domains.insert(candidate);
+							continue 'outer;
+						}
+						Some(url) => url,
+					};
+
+					// if a check url is set, call it
+					// -- avoid DDoSing a backend
+					tokio::time::sleep(Duration::from_secs(2)).await;
+					match self.on_demand_tls_ask(check_url, &candidate).await {
+						Ok(()) => {
+							trace!(
+								"domain {} validated on glob pattern {} and on check url {}",
+								candidate,
+								pattern,
+								check_url
+							);
+							domains.insert(candidate);
+							continue 'outer;
+						}
+						Err(e) => {
+							warn!("domain {} validation refused  on glob pattern {} and on check url {} with error: {}", candidate, pattern, check_url, e);
+						}
+					}
+				}
+			}
 		}
 
+		return domains;
+	}
+
+	/// This function is also in charge of the refresh of the domain names
+	fn get_cert_for_https(self: &Arc<Self>, domain: &str) -> Result<Arc<Cert>> {
 		// Check in local memory if it exists
 		if let Some(cert) = self.certs.read().unwrap().get(domain) {
 			if cert.is_old() {
@@ -142,6 +242,57 @@ impl CertStore {
 		self.gen_self_signed_certificate(domain)
 	}
 
+	pub async fn warmup_memory_store(self: &Arc<Self>) -> Result<()> {
+		let consul_certs = self
+			.consul
+			.kv_get_prefix("certs/", None)
+			.await?
+			.into_inner();
+
+		trace!(
+			"Fetched {} certificate entries from Consul",
+			consul_certs.len()
+		);
+		let mut loaded_certs: usize = 0;
+		for (key, cert) in consul_certs {
+			let certser: CertSer = match serde_json::from_slice(&cert) {
+				Ok(cs) => cs,
+				Err(e) => {
+					warn!("Could not deserialize CertSer for {key}: {e}");
+					continue;
+				}
+			};
+			let domain = certser.hostname.clone();
+
+			let cert = match Cert::new(certser) {
+				Ok(c) => c,
+				Err(e) => {
+					warn!("Could not create Cert from CertSer for domain {domain}: {e}");
+					continue;
+				}
+			};
+
+			self.certs
+				.write()
+				.unwrap()
+				.insert(domain.to_string(), Arc::new(cert));
+
+			debug!("({domain}) Certificate loaded from Consul to the Memory Store");
+			loaded_certs += 1;
+		}
+		info!("Memory store warmed up with {loaded_certs} certificates");
+		Ok(())
+	}
+
+	/// Check certificate ensure that the certificate is in the memory store
+	/// and that it does not need to be renewed.
+	///
+	/// If it's not in the memory store, it tries to load it from Consul,
+	/// if it's not in Consul, it calls Let's Encrypt.
+	///
+	/// If the certificate is outdated in the memory store, it tries to load
+	/// a more recent version in Consul, if the Consul version is also outdated,
+	/// it tries to renew it
 	pub async fn check_cert(self: &Arc<Self>, domain: &str) -> Result<()> {
 		// First, try locally.
 		{
@@ -159,41 +310,43 @@ impl CertStore {
 			.kv_get_json::<CertSer>(&format!("certs/{}", domain))
 			.await?
 		{
-			if let Ok(cert) = Cert::new(consul_cert) {
-				let cert = Arc::new(cert);
-				self.certs
-					.write()
-					.unwrap()
-					.insert(domain.to_string(), cert.clone());
-				if !cert.is_old() {
-					return Ok(());
+			match Cert::new(consul_cert) {
+				Ok(cert) => {
+					let cert = Arc::new(cert);
+					self.certs
+						.write()
+						.unwrap()
+						.insert(domain.to_string(), cert.clone());
+					debug!("({domain}) Certificate loaded from Consul to the Memory Store");
+
+					if !cert.is_old() {
+						return Ok(());
+					}
 				}
-			}
+				Err(e) => {
+					warn!("Could not create Cert from CertSer for domain {domain}: {e}");
+				}
+			};
 		}
 
 		// Third, ask from Let's Encrypt
 		self.renew_cert(domain).await
 	}
 
+	/// This is the place where certificates are generated or renewed
 	pub async fn renew_cert(self: &Arc<Self>, domain: &str) -> Result<()> {
 		info!("({}) Renewing certificate", domain);
 
-		// Basic sanity check (we could add more kinds of checks here)
-		// This is just to help avoid getting rate-limited against ACME server
-		if !domain.contains('.') || domain.ends_with(".local") {
-			bail!("Probably not a publicly accessible domain, skipping (a self-signed certificate will be used)");
-		}
-
 		// ---- Acquire lock ----
 		// the lock is acquired for half an hour,
 		// so that in case of an error we won't retry before
 		// that delay expires
 
 		let lock_path = format!("renew_lock/{}", domain);
-		let lock_name = format!("tricot/renew:{}@{}", domain, self.consul.local_node.clone());
+		let lock_name = format!("tricot/renew:{}@{}", domain, self.node_name);
 		let session = self
 			.consul
-			.create_session(&ConsulSessionRequest {
+			.create_session(&consul::locking::SessionRequest {
 				name: lock_name.clone(),
 				node: None,
 				lock_delay: Some("30m".into()),
@@ -278,7 +431,7 @@ impl CertStore {
 
 		let certser = CertSer {
 			hostname: domain.to_string(),
-			date: Utc::today().naive_utc(),
+			date: Utc::now().date_naive(),
 			valid_days: cert.valid_days_left()?,
 			key_pem,
 			cert_pem,
@@ -299,6 +452,19 @@ impl CertStore {
 		Ok(())
 	}
 
+	async fn on_demand_tls_ask(&self, check_url: &str, domain: &str) -> Result<()> {
+		let httpcli = reqwest::Client::new();
+		let chall_url = format!("{}?domain={}", check_url, domain);
+		info!("({}) On-demand TLS check", domain);
+
+		let httpresp = httpcli.get(&chall_url).send().await?;
+		if httpresp.status() != reqwest::StatusCode::OK {
+			bail!("{} is not authorized for on-demand TLS", domain);
+		}
+
+		Ok(())
+	}
+
 	async fn check_domain_accessibility(&self, domain: &str, session: &str) -> Result<()> {
 		// Returns Ok(()) only if domain is a correct domain name that
 		// redirects to this server
@@ -345,7 +511,7 @@ impl CertStore {
 
 		let certser = CertSer {
 			hostname: domain.to_string(),
-			date: Utc::today().naive_utc(),
+			date: Utc::now().date_naive(),
 			valid_days: 1024,
 			key_pem: cert.serialize_private_key_pem(),
 			cert_pem: cert.serialize_pem()?,

src/consul.rs

@@ -1,245 +0,0 @@
-use std::collections::HashMap;
-use std::fs::File;
-use std::io::Read;
-
-use anyhow::{bail, Result};
-use bytes::Bytes;
-use log::*;
-use reqwest::StatusCode;
-use serde::{Deserialize, Serialize};
-
-pub struct ConsulConfig {
-	pub addr: String,
-	pub ca_cert: Option<String>,
-	pub client_cert: Option<String>,
-	pub client_key: Option<String>,
-}
-
-// ---- Watch and retrieve Consul catalog ----
-//
-#[derive(Serialize, Deserialize, Debug)]
-pub struct ConsulNode {
-	#[serde(rename = "Node")]
-	pub node: String,
-	#[serde(rename = "Address")]
-	pub address: String,
-	#[serde(rename = "Meta")]
-	pub meta: HashMap<String, String>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct ConsulServiceEntry {
-	#[serde(rename = "Service")]
-	pub service: String,
-
-	#[serde(rename = "Address")]
-	pub address: String,
-
-	#[serde(rename = "Port")]
-	pub port: u16,
-
-	#[serde(rename = "Tags")]
-	pub tags: Vec<String>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct ConsulNodeCatalog {
-	#[serde(rename = "Node")]
-	pub node: ConsulNode,
-	#[serde(rename = "Services")]
-	pub services: HashMap<String, ConsulServiceEntry>,
-}
-
-// ---- Consul session management ----
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct ConsulSessionRequest {
-	#[serde(rename = "Name")]
-	pub name: String,
-
-	#[serde(rename = "Node")]
-	pub node: Option<String>,
-
-	#[serde(rename = "LockDelay")]
-	pub lock_delay: Option<String>,
-
-	#[serde(rename = "TTL")]
-	pub ttl: Option<String>,
-
-	#[serde(rename = "Behavior")]
-	pub behavior: Option<String>,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct ConsulSessionResponse {
-	#[serde(rename = "ID")]
-	pub id: String,
-}
-
-#[derive(Clone)]
-pub struct Consul {
-	client: reqwest::Client,
-
-	url: String,
-	kv_prefix: String,
-
-	pub local_node: String,
-}
-
-impl Consul {
-	pub fn new(config: ConsulConfig, kv_prefix: &str, local_node: &str) -> Result<Self> {
-		let client = match (&config.ca_cert, &config.client_cert, &config.client_key) {
-			(Some(ca_cert), Some(client_cert), Some(client_key)) => {
-				let mut ca_cert_buf = vec![];
-				File::open(ca_cert)?.read_to_end(&mut ca_cert_buf)?;
-
-				let mut client_cert_buf = vec![];
-				File::open(client_cert)?.read_to_end(&mut client_cert_buf)?;
-
-				let mut client_key_buf = vec![];
-				File::open(client_key)?.read_to_end(&mut client_key_buf)?;
-
-				reqwest::Client::builder()
-					.use_rustls_tls()
-					.add_root_certificate(reqwest::Certificate::from_pem(&ca_cert_buf[..])?)
-					.identity(reqwest::Identity::from_pem(
-						&[&client_cert_buf[..], &client_key_buf[..]].concat()[..],
-					)?)
-					.build()?
-			}
-			(None, None, None) => reqwest::Client::new(),
-			_ => bail!("Incomplete Consul TLS configuration parameters"),
-		};
-
-		Ok(Self {
-			client,
-			url: config.addr.trim_end_matches('/').to_string(),
-			kv_prefix: kv_prefix.to_string(),
-			local_node: local_node.into(),
-		})
-	}
-
-	pub async fn list_nodes(&self) -> Result<Vec<ConsulNode>> {
-		debug!("list_nodes");
-
-		let url = format!("{}/v1/catalog/nodes", self.url);
-
-		let http = self.client.get(&url).send().await?;
-		let resp: Vec<ConsulNode> = http.json().await?;
-		Ok(resp)
-	}
-
-	pub async fn watch_node(
-		&self,
-		host: &str,
-		idx: Option<usize>,
-	) -> Result<(ConsulNodeCatalog, usize)> {
-		debug!("watch_node {} {:?}", host, idx);
-
-		let url = match idx {
-			Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
-			None => format!("{}/v1/catalog/node/{}", self.url, host),
-		};
-
-		let http = self.client.get(&url).send().await?;
-		let new_idx = match http.headers().get("X-Consul-Index") {
-			Some(v) => v.to_str()?.parse::<usize>()?,
-			None => bail!("X-Consul-Index header not found"),
-		};
-
-		let resp: ConsulNodeCatalog = http.json().await?;
-		Ok((resp, new_idx))
-	}
-
-	// ---- KV get and put ----
-
-	pub async fn kv_get(&self, key: &str) -> Result<Option<Bytes>> {
-		debug!("kv_get {}", key);
-
-		let url = format!("{}/v1/kv/{}{}?raw", self.url, self.kv_prefix, key);
-		let http = self.client.get(&url).send().await?;
-		match http.status() {
-			StatusCode::OK => Ok(Some(http.bytes().await?)),
-			StatusCode::NOT_FOUND => Ok(None),
-			_ => Err(anyhow!(
-				"Consul request failed: {:?}",
-				http.error_for_status()
-			)),
-		}
-	}
-
-	pub async fn kv_get_json<T: for<'de> Deserialize<'de>>(&self, key: &str) -> Result<Option<T>> {
-		debug!("kv_get_json {}", key);
-
-		let url = format!("{}/v1/kv/{}{}?raw", self.url, self.kv_prefix, key);
-		let http = self.client.get(&url).send().await?;
-		match http.status() {
-			StatusCode::OK => Ok(Some(http.json().await?)),
-			StatusCode::NOT_FOUND => Ok(None),
-			_ => Err(anyhow!(
-				"Consul request failed: {:?}",
-				http.error_for_status()
-			)),
-		}
-	}
-
-	pub async fn kv_put(&self, key: &str, bytes: Bytes) -> Result<()> {
-		debug!("kv_put {}", key);
-
-		let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
-		let http = self.client.put(&url).body(bytes).send().await?;
-		http.error_for_status()?;
-		Ok(())
-	}
-
-	pub async fn kv_put_json<T: Serialize>(&self, key: &str, value: &T) -> Result<()> {
-		debug!("kv_put_json {}", key);
-
-		let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
-		let http = self.client.put(&url).json(value).send().await?;
-		http.error_for_status()?;
-		Ok(())
-	}
-
-	pub async fn kv_delete(&self, key: &str) -> Result<()> {
-		let url = format!("{}/v1/kv/{}{}", self.url, self.kv_prefix, key);
-		let http = self.client.delete(&url).send().await?;
-		http.error_for_status()?;
-		Ok(())
-	}
-
-	// ---- Locking ----
-
-	pub async fn create_session(&self, req: &ConsulSessionRequest) -> Result<String> {
-		debug!("create_session {:?}", req);
-
-		let url = format!("{}/v1/session/create", self.url);
-		let http = self.client.put(&url).json(req).send().await?;
-		let resp: ConsulSessionResponse = http.json().await?;
-		Ok(resp.id)
-	}
-
-	pub async fn acquire(&self, key: &str, bytes: Bytes, session: &str) -> Result<bool> {
-		debug!("acquire {}", key);
-
-		let url = format!(
-			"{}/v1/kv/{}{}?acquire={}",
-			self.url, self.kv_prefix, key, session
-		);
-		let http = self.client.put(&url).body(bytes).send().await?;
-		let resp: bool = http.json().await?;
-		Ok(resp)
-	}
-
-	pub async fn release(&self, key: &str, bytes: Bytes, session: &str) -> Result<()> {
-		debug!("release {}", key);
-
-		let url = format!(
-			"{}/v1/kv/{}{}?release={}",
-			self.url, self.kv_prefix, key, session
-		);
-		let http = self.client.put(&url).body(bytes).send().await?;
-		http.error_for_status()?;
-		Ok(())
-	}
-}

src/http.rs

@@ -2,7 +2,7 @@ use std::net::SocketAddr;
 use std::sync::Arc;
 
 use anyhow::Result;
-use log::*;
+use tracing::*;
 
 use futures::future::Future;
 use http::uri::Authority;

src/https.rs

@@ -1,10 +1,10 @@
 use std::convert::Infallible;
 use std::net::SocketAddr;
 use std::sync::{atomic::Ordering, Arc};
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 use anyhow::Result;
-use log::*;
+use tracing::*;
 
 use accept_encoding_fork::Encoding;
 use async_compression::tokio::bufread::*;
@@ -21,8 +21,10 @@ use tokio::sync::watch;
 use tokio_rustls::TlsAcceptor;
 use tokio_util::io::{ReaderStream, StreamReader};
 
+use opentelemetry::{metrics, KeyValue};
+
 use crate::cert_store::{CertStore, StoreResolver};
-use crate::proxy_config::ProxyConfig;
+use crate::proxy_config::{HostDescription, ProxyConfig, ProxyEntry};
 use crate::reverse_proxy;
 
 const MAX_CONNECTION_LIFETIME: Duration = Duration::from_secs(24 * 3600);
@@ -31,6 +33,15 @@ pub struct HttpsConfig {
 	pub bind_addr: SocketAddr,
 	pub enable_compression: bool,
 	pub compress_mime_types: Vec<String>,
+
+	// used internally to convert Instants to u64
+	pub time_origin: Instant,
+}
+
+struct HttpsMetrics {
+	requests_received: metrics::Counter<u64>,
+	requests_served: metrics::Counter<u64>,
+	request_proxy_duration: metrics::Histogram<f64>,
 }
 
 pub async fn serve_https(
@@ -41,6 +52,22 @@ pub async fn serve_https(
 ) -> Result<()> {
 	let config = Arc::new(config);
 
+	let meter = opentelemetry::global::meter("tricot");
+	let metrics = Arc::new(HttpsMetrics {
+		requests_received: meter
+			.u64_counter("https_requests_received")
+			.with_description("Total number of requests received over HTTPS")
+			.init(),
+		requests_served: meter
+			.u64_counter("https_requests_served")
+			.with_description("Total number of requests served over HTTPS")
+			.init(),
+		request_proxy_duration: meter
+			.f64_histogram("https_request_proxy_duration")
+			.with_description("Duration between time when request was received, and time when backend returned status code and headers")
+			.init(),
+	});
+
 	let mut tls_cfg = rustls::ServerConfig::builder()
 		.with_safe_defaults()
 		.with_no_client_auth()
@@ -71,20 +98,31 @@ pub async fn serve_https(
 		let rx_proxy_config = rx_proxy_config.clone();
 		let tls_acceptor = tls_acceptor.clone();
 		let config = config.clone();
+		let metrics = metrics.clone();
 
 		let mut must_exit_2 = must_exit.clone();
 		let conn = tokio::spawn(async move {
 			match tls_acceptor.accept(socket).await {
 				Ok(stream) => {
 					debug!("TLS handshake was successfull");
-					let http_conn = Http::new().serve_connection(
-						stream,
-						service_fn(move |req: Request<Body>| {
-							let https_config = config.clone();
-							let proxy_config: Arc<ProxyConfig> = rx_proxy_config.borrow().clone();
-							handle_outer(remote_addr, req, https_config, proxy_config)
-						}),
-					);
+					let http_conn = Http::new()
+						.serve_connection(
+							stream,
+							service_fn(move |req: Request<Body>| {
+								let https_config = config.clone();
+								let proxy_config: Arc<ProxyConfig> =
+									rx_proxy_config.borrow().clone();
+								let metrics = metrics.clone();
+								handle_request(
+									remote_addr,
+									req,
+									https_config,
+									proxy_config,
+									metrics,
+								)
+							}),
+						)
+						.with_upgrades();
 					let timeout = tokio::time::sleep(MAX_CONNECTION_LIFETIME);
 					tokio::pin!(http_conn, timeout);
 					let http_result = loop {
@@ -116,52 +154,89 @@ pub async fn serve_https(
 	Ok(())
 }
 
-async fn handle_outer(
+async fn handle_request(
 	remote_addr: SocketAddr,
 	req: Request<Body>,
 	https_config: Arc<HttpsConfig>,
 	proxy_config: Arc<ProxyConfig>,
+	metrics: Arc<HttpsMetrics>,
 ) -> Result<Response<Body>, Infallible> {
-	match handle(remote_addr, req, https_config, proxy_config).await {
-		Err(e) => {
-			warn!("Handler error: {}", e);
-			Ok(Response::builder()
-				.status(StatusCode::INTERNAL_SERVER_ERROR)
-				.body(Body::from(format!("{}", e)))
-				.unwrap())
-		}
-		Ok(r) => Ok(r),
-	}
+	let method_tag = KeyValue::new("method", req.method().to_string());
+
+	// The host tag is only included in the requests_received metric,
+	// as for other metrics it can easily lead to cardinality explosions.
+	let host_tag = KeyValue::new(
+		"host",
+		req.uri()
+			.authority()
+			.map(|auth| auth.to_string())
+			.or_else(|| {
+				req.headers()
+					.get("host")
+					.map(|host| host.to_str().unwrap_or_default().to_string())
+			})
+			.unwrap_or_default(),
+	);
+
+	metrics
+		.requests_received
+		.add(1, &[host_tag, method_tag.clone()]);
+
+	let mut tags = vec![method_tag];
+	let resp = select_target_and_proxy(
+		&https_config,
+		&proxy_config,
+		&metrics,
+		remote_addr,
+		req,
+		&mut tags,
+	)
+	.await;
+
+	tags.push(KeyValue::new("status_code", resp.status().as_u16() as i64));
+	metrics.requests_served.add(1, &tags);
+
+	Ok(resp)
 }
 
 // Custom echo service, handling two different routes and a
 // catch-all 404 responder.
-async fn handle(
+async fn select_target_and_proxy(
+	https_config: &HttpsConfig,
+	proxy_config: &ProxyConfig,
+	metrics: &HttpsMetrics,
 	remote_addr: SocketAddr,
 	req: Request<Body>,
-	https_config: Arc<HttpsConfig>,
-	proxy_config: Arc<ProxyConfig>,
-) -> Result<Response<Body>, anyhow::Error> {
+	tags: &mut Vec<KeyValue>,
+) -> Response<Body> {
+	let received_time = Instant::now();
+
 	let method = req.method().clone();
 	let uri = req.uri().to_string();
 
 	let host = if let Some(auth) = req.uri().authority() {
 		auth.as_str()
 	} else {
-		req.headers()
-			.get("host")
-			.ok_or_else(|| anyhow!("Missing host header"))?
-			.to_str()?
+		match req.headers().get("host").and_then(|x| x.to_str().ok()) {
+			Some(host) => host,
+			None => {
+				return Response::builder()
+					.status(StatusCode::BAD_REQUEST)
+					.body(Body::from("Missing Host header"))
+					.unwrap();
+			}
+		}
 	};
 	let path = req.uri().path();
-	let accept_encoding = accept_encoding_fork::encodings(req.headers()).unwrap_or_else(|_| vec![]);
 
 	let best_match = proxy_config
 		.entries
 		.iter()
 		.filter(|ent| {
-			ent.host.matches(host)
+			ent.flags.healthy
+				&& ent.url_prefix.host.matches(host)
 				&& ent
+					.url_prefix
 					.path_prefix
 					.as_ref()
 					.map(|prefix| path.starts_with(prefix))
@@ -170,67 +245,147 @@ async fn handle(
 		.max_by_key(|ent| {
 			(
 				ent.priority,
-				ent.path_prefix
+				ent.url_prefix
+					.path_prefix
 					.as_ref()
 					.map(|x| x.len() as i32)
 					.unwrap_or(0),
-				ent.same_node,
-				ent.same_site,
-				-ent.calls.load(Ordering::SeqCst),
+				(ent.flags.same_node || ent.flags.site_lb || ent.flags.global_lb),
+				(ent.flags.same_site || ent.flags.global_lb),
+				-ent.calls_in_progress.load(Ordering::SeqCst),
+				-ent.last_call.load(Ordering::SeqCst),
 			)
 		});
 
 	if let Some(proxy_to) = best_match {
-		proxy_to.calls.fetch_add(1, Ordering::SeqCst);
+		tags.push(KeyValue::new("service", proxy_to.service_name.clone()));
+		tags.push(KeyValue::new(
+			"target_addr",
+			proxy_to.target_addr.to_string(),
+		));
+		tags.push(KeyValue::new("same_node", proxy_to.flags.same_node));
+		tags.push(KeyValue::new("same_site", proxy_to.flags.same_site));
 
+		proxy_to.last_call.fetch_max(
+			(received_time - https_config.time_origin).as_millis() as i64,
+			Ordering::Relaxed,
+		);
+		proxy_to.calls_in_progress.fetch_add(1, Ordering::SeqCst);
+
+		// Forward to backend
 		debug!("{}{} -> {}", host, path, proxy_to);
 		trace!("Request: {:?}", req);
 
-		let mut response = if proxy_to.https_target {
-			let to_addr = format!("https://{}", proxy_to.target_addr);
-			handle_error(reverse_proxy::call_https(remote_addr.ip(), &to_addr, req).await)
+		let response = if let Some(http_res) = try_redirect(host, path, proxy_to) {
+			// redirection middleware
+			http_res
 		} else {
-			let to_addr = format!("http://{}", proxy_to.target_addr);
-			handle_error(reverse_proxy::call(remote_addr.ip(), &to_addr, req).await)
+			// proxying to backend
+			match do_proxy(https_config, remote_addr, req, proxy_to).await {
+				Ok(resp) => resp,
+				Err(e) => Response::builder()
+					.status(StatusCode::BAD_GATEWAY)
+					.body(Body::from(format!("Proxy error: {}", e)))
+					.unwrap(),
+			}
 		};
 
-		// Do further processing (compression, additionnal headers) only for 2xx responses
-		if !response.status().is_success() {
-			return Ok(response);
+		proxy_to.calls_in_progress.fetch_sub(1, Ordering::SeqCst);
+		metrics
+			.request_proxy_duration
+			.record(received_time.elapsed().as_secs_f64(), tags);
+
+		trace!("Final response: {:?}", response);
+		info!("{} {} {}", method, response.status().as_u16(), uri);
+		response
+	} else {
+		debug!("{}{} -> NOT FOUND", host, path);
+		info!("{} 404 {}", method, uri);
+
+		Response::builder()
+			.status(StatusCode::NOT_FOUND)
+			.body(Body::from("No matching proxy entry"))
+			.unwrap()
+	}
+}
+
+fn try_redirect(req_host: &str, req_path: &str, proxy_to: &ProxyEntry) -> Option<Response<Body>> {
+	let maybe_redirect = proxy_to.redirects.iter().find(|(src, _, _)| {
+		let mut matched: bool = src.host.matches(req_host);
+
+		if let Some(path) = &src.path_prefix {
+			matched &= req_path.starts_with(path);
 		}
 
+		matched
+	});
+
+	let (src_prefix, dst_prefix, code) = match maybe_redirect {
+		None => return None,
+		Some(redirect) => redirect,
+	};
+
+	let new_host = match &dst_prefix.host {
+		HostDescription::Hostname(h) => h,
+		_ => unreachable!(), // checked when ProxyEntry is created
+	};
+
+	let new_prefix = dst_prefix.path_prefix.as_deref().unwrap_or("");
+	let original_prefix = src_prefix.path_prefix.as_deref().unwrap_or("");
+	let suffix = &req_path[original_prefix.len()..];
+
+	let uri = format!("https://{}{}{}", new_host, new_prefix, suffix);
+
+	let status = match StatusCode::from_u16(*code) {
+		Err(e) => {
+			warn!(
+				"Couldn't redirect {}{} to {} as code {} in invalid: {}",
+				req_host, req_path, uri, code, e
+			);
+			return None;
+		}
+		Ok(sc) => sc,
+	};
+
+	Response::builder()
+		.header("Location", uri.clone())
+		.status(status)
+		.body(Body::from(uri))
+		.ok()
+}
+
+async fn do_proxy(
+	https_config: &HttpsConfig,
+	remote_addr: SocketAddr,
+	req: Request<Body>,
+	proxy_to: &ProxyEntry,
+) -> Result<Response<Body>> {
+	let method = req.method().clone();
+	let accept_encoding = accept_encoding_fork::encodings(req.headers()).unwrap_or_else(|_| vec![]);
+
+	let mut response = if proxy_to.https_target {
+		let to_addr = format!("https://{}", proxy_to.target_addr);
+		reverse_proxy::call_https(remote_addr.ip(), &to_addr, req).await?
+	} else {
+		let to_addr = format!("http://{}", proxy_to.target_addr);
+		reverse_proxy::call(remote_addr.ip(), &to_addr, req).await?
+	};
+
+	if response.status().is_success() {
+		// (TODO: maybe we want to add these headers even if it's not a success?)
 		for (header, value) in proxy_to.add_headers.iter() {
 			response.headers_mut().insert(
 				HeaderName::from_bytes(header.as_bytes())?,
 				HeaderValue::from_str(value)?,
 			);
 		}
-		trace!("Response: {:?}", response);
-		info!("{} {} {}", method, response.status().as_u16(), uri);
-
-		if https_config.enable_compression {
-			try_compress(response, method, accept_encoding, &https_config).await
-		} else {
-			Ok(response)
-		}
-	} else {
-		debug!("{}{} -> NOT FOUND", host, path);
-		info!("{} 404 {}", method, uri);
-
-		Ok(Response::builder()
-			.status(StatusCode::NOT_FOUND)
-			.body(Body::from("No matching proxy entry"))?)
 	}
-}
 
-fn handle_error(resp: Result<Response<Body>>) -> Response<Body> {
-	match resp {
-		Ok(resp) => resp,
-		Err(e) => Response::builder()
-			.status(StatusCode::BAD_GATEWAY)
-			.body(Body::from(format!("Proxy error: {}", e)))
-			.unwrap(),
-	}
+	if https_config.enable_compression {
+		response = try_compress(response, method, accept_encoding, https_config).await?
+	};
+
+	Ok(response)
 }
 
 async fn try_compress(
@@ -240,10 +395,14 @@ async fn try_compress(
 	https_config: &HttpsConfig,
 ) -> Result<Response<Body>> {
 	// Don't bother compressing successfull responses for HEAD and PUT (they should have an empty body)
-	// Don't compress partial content, that would be wierd
-	// If already compressed, return as is
+	// Don't compress partial content as it causes issues
+	// Don't bother compressing non-2xx results
+	// Don't compress Upgrade responses (e.g. websockets)
+	// Don't compress responses that are already compressed
 	if (response.status().is_success() && (method == Method::HEAD || method == Method::PUT))
 		|| response.status() == StatusCode::PARTIAL_CONTENT
+		|| !response.status().is_success()
+		|| response.headers().get(header::CONNECTION) == Some(&HeaderValue::from_static("Upgrade"))
 		|| response.headers().get(header::CONTENT_ENCODING).is_some()
 	{
 		return Ok(response);

src/main.rs

@@ -1,8 +1,10 @@
 #[macro_use]
 extern crate anyhow;
 
-use log::*;
+use std::collections::BTreeMap;
 use std::sync::Arc;
+use std::time::Instant;
+use tracing::*;
 
 use futures::{FutureExt, TryFutureExt};
 use std::net::SocketAddr;
@@ -12,13 +14,14 @@ use tokio::sync::watch;
 
 mod cert;
 mod cert_store;
-mod consul;
 mod http;
 mod https;
+mod metrics;
 mod proxy_config;
 mod reverse_proxy;
 mod tls_util;
 
+pub use df_consul as consul;
 use proxy_config::ProxyConfig;
 
 #[cfg(feature = "dhat-heap")]
@@ -40,6 +43,10 @@ struct Opt {
 	#[structopt(long = "consul-ca-cert", env = "TRICOT_CONSUL_CA_CERT")]
 	pub consul_ca_cert: Option<String>,
 
+	/// Skip TLS verification for Consul
+	#[structopt(long = "consul-tls-skip-verify", env = "TRICOT_CONSUL_TLS_SKIP_VERIFY")]
+	pub consul_tls_skip_verify: bool,
+
 	/// Client certificate for Consul server with TLS
 	#[structopt(long = "consul-client-cert", env = "TRICOT_CONSUL_CLIENT_CERT")]
 	pub consul_client_cert: Option<String>,
@@ -76,6 +83,10 @@ struct Opt {
 	)]
 	pub https_bind_addr: SocketAddr,
 
+	/// Bind address for metrics server (Prometheus format over HTTP)
+	#[structopt(long = "metrics-bind-addr", env = "TRICOT_METRICS_BIND_ADDR")]
+	pub metrics_bind_addr: Option<SocketAddr>,
+
 	/// E-mail address for Let's Encrypt certificate requests
 	#[structopt(long = "letsencrypt-email", env = "TRICOT_LETSENCRYPT_EMAIL")]
 	pub letsencrypt_email: String,
@@ -91,6 +102,12 @@ struct Opt {
 		default_value = "text/html,text/plain,text/css,text/javascript,text/xml,application/javascript,application/json,application/xml,image/svg+xml,font/ttf"
 	)]
 	pub compress_mime_types: String,
+
+	#[structopt(
+		long = "warmup-cert-memory-store",
+		env = "TRICOT_WARMUP_CERT_MEMORY_STORE"
+	)]
+	pub warmup_cert_memory_store: bool,
 }
 
 #[tokio::main(flavor = "multi_thread", worker_threads = 10)]
@@ -101,7 +118,10 @@ async fn main() {
 	if std::env::var("RUST_LOG").is_err() {
 		std::env::set_var("RUST_LOG", "tricot=info")
 	}
-	pretty_env_logger::init();
+	tracing_subscriber::fmt()
+		.with_writer(std::io::stderr)
+		.with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
+		.init();
 
 	// Abort on panic (same behavior as in Go)
 	std::panic::set_hook(Box::new(|panic_info| {
@@ -119,24 +139,44 @@ async fn main() {
 		let _ = provoke_exit.send(true);
 	};
 
-	let consul_config = consul::ConsulConfig {
+	let metrics_server = metrics::MetricsServer::init(opt.metrics_bind_addr);
+
+	let consul_config = consul::Config {
 		addr: opt.consul_addr.clone(),
 		ca_cert: opt.consul_ca_cert.clone(),
+		tls_skip_verify: opt.consul_tls_skip_verify,
 		client_cert: opt.consul_client_cert.clone(),
 		client_key: opt.consul_client_key.clone(),
 	};
 
-	let consul = consul::Consul::new(consul_config, &opt.consul_kv_prefix, &opt.node_name)
+	let consul = consul::Consul::new(consul_config, &opt.consul_kv_prefix)
 		.expect("Error creating Consul client");
-	let rx_proxy_config =
-		proxy_config::spawn_proxy_config_task(consul.clone(), exit_signal.clone());
+	let rx_proxy_config = proxy_config::spawn_proxy_config_task(
+		consul.clone(),
+		opt.node_name.clone(),
+		exit_signal.clone(),
+	);
 
 	let cert_store = cert_store::CertStore::new(
 		consul.clone(),
+		opt.node_name.clone(),
 		rx_proxy_config.clone(),
 		opt.letsencrypt_email.clone(),
 		exit_on_err.clone(),
 	);
+	if opt.warmup_cert_memory_store {
+		match cert_store.warmup_memory_store().await {
+            Err(e) => error!("An error occured while warming up the certificate memory store with Consul data, continue without caching: {e}"),
+            _ => (),
+        };
+	}
+
+	let metrics_task = tokio::spawn(
+		metrics_server
+			.run(wait_from(exit_signal.clone()))
+			.map_err(exit_on_err.clone())
+			.then(|_| async { info!("Metrics server exited") }),
+	);
 
 	let http_task = tokio::spawn(
 		http::serve_http(
@@ -156,6 +196,7 @@ async fn main() {
 			.split(',')
 			.map(|x| x.to_string())
 			.collect(),
+		time_origin: Instant::now(),
 	};
 
 	let https_task = tokio::spawn(
@@ -171,29 +212,58 @@ async fn main() {
 
 	let dump_task = tokio::spawn(dump_config_on_change(rx_proxy_config, exit_signal.clone()));
 
-	let _ = http_task.await.expect("Tokio task await failure");
-	let _ = https_task.await.expect("Tokio task await failure");
-	let _ = dump_task.await.expect("Tokio task await failure");
+	metrics_task.await.expect("Tokio task await failure");
+	http_task.await.expect("Tokio task await failure");
+	https_task.await.expect("Tokio task await failure");
+	dump_task.await.expect("Tokio task await failure");
 }
 
 async fn dump_config_on_change(
 	mut rx_proxy_config: watch::Receiver<Arc<ProxyConfig>>,
 	mut must_exit: watch::Receiver<bool>,
 ) {
+	let mut old_cfg: Arc<ProxyConfig> = rx_proxy_config.borrow().clone();
+
 	while !*must_exit.borrow() {
 		select!(
 			c = rx_proxy_config.changed() => {
-				if !c.is_ok() {
+				if c.is_err() {
 					break;
 				}
 			}
 			_ = must_exit.changed() => continue,
 		);
-		println!("---- PROXY CONFIGURATION ----");
-		for ent in rx_proxy_config.borrow().entries.iter() {
-			println!("   {}", ent);
+
+		let cfg: Arc<ProxyConfig> = rx_proxy_config.borrow().clone();
+		if cfg != old_cfg {
+			let mut cfg_map = BTreeMap::<_, Vec<_>>::new();
+			for ent in cfg.entries.iter() {
+				cfg_map
+					.entry((&ent.url_prefix.host, &ent.url_prefix.path_prefix))
+					.or_default()
+					.push(ent);
+			}
+
+			println!(
+				"---- PROXY CONFIGURATION at {} ----",
+				chrono::offset::Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Secs, true)
+			);
+			for ((host, prefix), ents) in cfg_map.iter_mut() {
+				println!("{}{}:", host, prefix.as_deref().unwrap_or_default());
+				for ent in ents.iter() {
+					print!("    ");
+					if !ent.flags.healthy {
+						print!("/!\\ ");
+					} else {
+						print!("    ");
+					}
+					println!("{}", ent);
+				}
+			}
+			println!();
+
+			old_cfg = cfg;
 		}
-		println!();
 	}
 }
 

src/metrics.rs

@@ -0,0 +1,111 @@
+use std::convert::Infallible;
+use std::net::SocketAddr;
+use std::sync::Arc;
+
+use anyhow::Result;
+use futures::future::*;
+use tracing::*;
+
+use hyper::{
+	header::CONTENT_TYPE,
+	service::{make_service_fn, service_fn},
+	Body, Method, Request, Response, Server,
+};
+use opentelemetry::sdk::metrics;
+use prometheus::{Encoder, TextEncoder};
+
+pub struct MetricsServer {
+	bind_addr: Option<SocketAddr>,
+	registry: prometheus::Registry,
+}
+
+impl MetricsServer {
+	pub fn init(bind_addr: Option<SocketAddr>) -> MetricsServer {
+		let registry = prometheus::Registry::new();
+		let exporter = opentelemetry_prometheus::exporter()
+			.with_registry(registry.clone())
+			.with_aggregation_selector(AggregationSelector)
+			.without_counter_suffixes()
+			.build()
+			.expect("build prometheus registry");
+		let mp = metrics::MeterProvider::builder()
+			.with_reader(exporter)
+			.build();
+		opentelemetry::global::set_meter_provider(mp);
+		Self {
+			bind_addr,
+			registry,
+		}
+	}
+
+	pub async fn run(self, shutdown_signal: impl Future<Output = ()>) -> Result<()> {
+		if let Some(addr) = self.bind_addr {
+			let metrics_server = Arc::new(self);
+
+			let make_svc = make_service_fn(move |_conn| {
+				let metrics_server = metrics_server.clone();
+				async move {
+					Ok::<_, Infallible>(service_fn(move |req| {
+						metrics_server.clone().serve_req(req)
+					}))
+				}
+			});
+
+			let server = Server::bind(&addr).serve(make_svc);
+			let graceful = server.with_graceful_shutdown(shutdown_signal);
+			info!("Metrics server listening on http://{}", addr);
+
+			graceful.await?;
+		} else {
+			info!("Metrics server is disabled");
+		}
+
+		Ok(())
+	}
+
+	async fn serve_req(
+		self: Arc<MetricsServer>,
+		req: Request<Body>,
+	) -> Result<Response<Body>, hyper::Error> {
+		debug!("{} {}", req.method(), req.uri());
+
+		let response = match (req.method(), req.uri().path()) {
+			(&Method::GET, "/metrics") => {
+				let mut buffer = vec![];
+				let encoder = TextEncoder::new();
+				let metric_families = self.registry.gather();
+				encoder.encode(&metric_families, &mut buffer).unwrap();
+
+				Response::builder()
+					.status(200)
+					.header(CONTENT_TYPE, encoder.format_type())
+					.body(Body::from(buffer))
+					.unwrap()
+			}
+			_ => Response::builder()
+				.status(404)
+				.body(Body::from("Not implemented"))
+				.unwrap(),
+		};
+
+		Ok(response)
+	}
+}
+
+struct AggregationSelector;
+
+impl metrics::reader::AggregationSelector for AggregationSelector {
+	fn aggregation(&self, kind: metrics::InstrumentKind) -> metrics::Aggregation {
+		match kind {
+			metrics::InstrumentKind::Histogram => metrics::Aggregation::ExplicitBucketHistogram {
+				boundaries: vec![
+					0.001, 0.0015, 0.002, 0.003, 0.005, 0.007, 0.01, 0.015, 0.02, 0.03, 0.05, 0.07,
+					0.1, 0.15, 0.2, 0.3, 0.5, 0.7, 1., 1.5, 2., 3., 5., 7., 10., 15., 20., 30.,
+					40., 50., 60., 70., 100.,
+				],
+				record_min_max: true,
+			},
+			_ => metrics::reader::DefaultAggregationSelector::new().aggregation(kind),
+		}
+	}
+}

src/proxy_config.rs

@@ -1,21 +1,19 @@
 use std::collections::HashMap;
 use std::net::SocketAddr;
 use std::sync::{atomic, Arc};
-use std::{cmp, time::Duration};
+use std::time::Duration;
 
 use anyhow::Result;
+use opentelemetry::{metrics, KeyValue};
 
-use futures::future::BoxFuture;
-use futures::stream::{FuturesUnordered, StreamExt};
+use tokio::{select, sync::watch};
+use tracing::*;
 
-use log::*;
-use tokio::{select, sync::watch, time::sleep};
-
-use crate::consul::*;
+use crate::consul;
 
 // ---- Extract proxy config from Consul catalog ----
 
-#[derive(Debug)]
+#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub enum HostDescription {
 	Hostname(String),
 	Pattern(glob::Pattern),
@@ -38,20 +36,153 @@ impl HostDescription {
 	}
 }
 
-#[derive(Debug)]
-pub struct ProxyEntry {
+impl std::fmt::Display for HostDescription {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		match self {
+			HostDescription::Hostname(h) => write!(f, "{}", h),
+			HostDescription::Pattern(p) => write!(f, "[{}]", p.as_str()),
+		}
+	}
+}
+
+#[derive(Debug, Clone)]
+pub struct UrlPrefix {
 	/// Publicly exposed TLS hostnames for matching this rule
 	pub host: HostDescription,
+
 	/// Path prefix for matching this rule
 	pub path_prefix: Option<String>,
+}
+
+impl PartialEq for UrlPrefix {
+	fn eq(&self, other: &Self) -> bool {
+		self.host == other.host && self.path_prefix == other.path_prefix
+	}
+}
+impl Eq for UrlPrefix {}
+
+impl UrlPrefix {
+	fn new(raw_prefix: &str) -> Option<Self> {
+		let (raw_host, path_prefix) = match raw_prefix.find('/') {
+			Some(i) => {
+				let (host, pp) = raw_prefix.split_at(i);
+				(host, Some(pp.to_string()))
+			}
+			None => (raw_prefix, None),
+		};
+
+		let host = match HostDescription::new(raw_host) {
+			Ok(h) => h,
+			Err(e) => {
+				warn!("Invalid hostname pattern {}: {}", raw_host, e);
+				return None;
+			}
+		};
+
+		Some(Self { host, path_prefix })
+	}
+}
+
+#[derive(Debug)]
+pub struct ProxyEntry {
+	/// An Url prefix is made of a host and maybe a path prefix
+	pub url_prefix: UrlPrefix,
 	/// Priority with which this rule is considered (highest first)
 	pub priority: u32,
 
+	/// Consul service name
+	pub service_name: String,
 	/// Node address (ip+port) to handle requests that match this entry
 	pub target_addr: SocketAddr,
 	/// Is the target serving HTTPS instead of HTTP?
 	pub https_target: bool,
 
+	/// Flags for target selection
+	pub flags: ProxyEntryFlags,
+
+	/// Add the following headers to all responses returned
+	/// when matching this rule
+	pub add_headers: Vec<(String, String)>,
+
+	/// Try to match all these redirection before forwarding to the backend
+	/// when matching this rule
+	pub redirects: Vec<(UrlPrefix, UrlPrefix, u16)>,
+
+	/// Wether or not the domain must be validated before asking a certificate
+	/// to let's encrypt (only for Glob patterns)
+	pub on_demand_tls_ask: Option<String>,
+
+	/// Number of calls in progress, used to deprioritize slow back-ends
+	pub calls_in_progress: atomic::AtomicI64,
+	/// Time of last call, used for round-robin selection
+	pub last_call: atomic::AtomicI64,
+}
+
+impl PartialEq for ProxyEntry {
+	fn eq(&self, other: &Self) -> bool {
+		self.url_prefix == other.url_prefix
+			&& self.priority == other.priority
+			&& self.service_name == other.service_name
+			&& self.target_addr == other.target_addr
+			&& self.https_target == other.https_target
+			&& self.flags == other.flags
+			&& self.add_headers == other.add_headers
+	}
+}
+impl Eq for ProxyEntry {}
+
+impl ProxyEntry {
+	fn new(
+		service_name: String,
+		frontend: MatchTag,
+		target_addr: SocketAddr,
+		middleware: &[ConfigTag],
+		flags: ProxyEntryFlags,
+	) -> Self {
+		let (url_prefix, priority, https_target) = match frontend {
+			MatchTag::Http(u, p) => (u, p, false),
+			MatchTag::HttpWithTls(u, p) => (u, p, true),
+		};
+
+		let mut add_headers = vec![];
+		let mut redirects = vec![];
+		let mut on_demand_tls_ask: Option<String> = None;
+		for mid in middleware.into_iter() {
+			// LocalLb and GlobalLb are handled in the parent function
+			match mid {
+				ConfigTag::AddHeader(k, v) => add_headers.push((k.to_string(), v.clone())),
+				ConfigTag::AddRedirect(m, r, c) => redirects.push(((*m).clone(), (*r).clone(), *c)),
+				ConfigTag::OnDemandTlsAsk(url) => on_demand_tls_ask = Some(url.to_string()),
+				ConfigTag::LocalLb | ConfigTag::GlobalLb => (),
+			};
+		}
+
+		ProxyEntry {
+			// id
+			service_name,
+			// frontend
+			url_prefix,
+			priority,
+			// backend
+			target_addr,
+			https_target,
+			// middleware
+			flags,
+			add_headers,
+			redirects,
+			on_demand_tls_ask,
+			// internal
+			last_call: atomic::AtomicI64::from(0),
+			calls_in_progress: atomic::AtomicI64::from(0),
+		}
+	}
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub struct ProxyEntryFlags {
+	/// Is the target healthy?
+	pub healthy: bool,
+
 	/// Is the target the same node as we are running on?
 	/// (if yes priorize it over other matching targets)
 	pub same_node: bool,
@@ -59,14 +190,10 @@ pub struct ProxyEntry {
 	/// (if yes priorize it over other matching targets)
 	pub same_site: bool,
 
-	/// Add the following headers to all responses returned
-	/// when matching this rule
-	pub add_headers: Vec<(String, String)>,
-
-	// Counts the number of times this proxy server has been called to
-	// This implements a round-robin load balancer if there are multiple
-	// entries for the same host and same path prefix.
-	pub calls: atomic::AtomicI64,
+	/// Is site-wide load balancing enabled for this service?
+	pub site_lb: bool,
+	/// Is global load balancing enabled for this service?
+	pub global_lb: bool,
 }
 
 impl std::fmt::Display for ProxyEntry {
@@ -75,148 +202,203 @@ impl std::fmt::Display for ProxyEntry {
 			write!(f, "https://")?;
 		}
 		write!(f, "{} ", self.target_addr)?;
-		match &self.host {
-			HostDescription::Hostname(h) => write!(f, "{}", h)?,
-			HostDescription::Pattern(p) => write!(f, "Pattern('{}')", p.as_str())?,
-		}
 		write!(
 			f,
-			"{} {}",
-			self.path_prefix.as_ref().unwrap_or(&String::new()),
+			"{}{} {}",
+			self.url_prefix.host,
+			self.url_prefix.path_prefix.as_deref().unwrap_or_default(),
 			self.priority
 		)?;
-		if self.same_node {
+		if !self.flags.healthy {
+			write!(f, " UNHEALTHY")?;
+		}
+		if self.flags.same_node {
 			write!(f, " OURSELF")?;
-		} else if self.same_site {
+		} else if self.flags.same_site {
 			write!(f, " SAME_SITE")?;
 		}
+		if self.flags.global_lb {
+			write!(f, " GLOBAL-LB")?;
+		} else if self.flags.site_lb {
+			write!(f, " SITE-LB")?;
+		}
 		if !self.add_headers.is_empty() {
 			write!(f, " +Headers: {:?}", self.add_headers)?;
 		}
-		write!(f, " ({})", self.calls.load(atomic::Ordering::Relaxed))
+		Ok(())
 	}
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct ProxyConfig {
 	pub entries: Vec<ProxyEntry>,
 }
 
-fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
-	// 1.2^x seems to be a good value to exponentially increase time at a good pace
-	// eg. 1.2^32 = 341 seconds ~= 5 minutes - ie. after 32 retries we wait 5
-	// minutes
-	Duration::from_secs(cmp::min(
-		max_time.as_secs(),
-		1.2f64.powf(retries as f64) as u64,
-	))
+#[derive(Debug)]
+enum ParsedTag<'a> {
+	Frontend(MatchTag),
+	Middleware(ConfigTag<'a>),
 }
 
-fn parse_tricot_tag(
-	tag: &str,
-	target_addr: SocketAddr,
-	add_headers: &[(String, String)],
-	same_node: bool,
-	same_site: bool,
-) -> Option<ProxyEntry> {
-	let splits = tag.split(' ').collect::<Vec<_>>();
-	if (splits.len() != 2 && splits.len() != 3)
-		|| (splits[0] != "tricot" && splits[0] != "tricot-https")
-	{
-		return None;
-	}
+#[derive(Debug)]
+enum MatchTag {
+	/// HTTP backend (plain text)
+	Http(UrlPrefix, u32),
+	/// HTTPS backend (TLS encrypted)
+	HttpWithTls(UrlPrefix, u32),
+}
 
-	let (host, path_prefix) = match splits[1].find('/') {
-		Some(i) => {
-			let (host, pp) = splits[1].split_at(i);
-			(host, Some(pp.to_string()))
+#[derive(Debug)]
+enum ConfigTag<'a> {
+	AddHeader(&'a str, String),
+	AddRedirect(UrlPrefix, UrlPrefix, u16),
+	OnDemandTlsAsk(&'a str),
+	GlobalLb,
+	LocalLb,
+}
+
+fn parse_tricot_tags(tag: &str) -> Option<ParsedTag> {
+	let splits = tag.splitn(4, ' ').collect::<Vec<_>>();
+	let parsed_tag = match splits.as_slice() {
+		["tricot", raw_prefix, maybe_priority @ ..] => {
+			// priority is set to 100 when value is invalid or missing
+			let priority: u32 = maybe_priority
+				.iter()
+				.next()
+				.map_or(Ok(100), |x| x.parse::<u32>())
+				.unwrap_or(100);
+			UrlPrefix::new(raw_prefix)
+				.map(|prefix| ParsedTag::Frontend(MatchTag::Http(prefix, priority)))
 		}
-		None => (splits[1], None),
-	};
-
-	let priority = match splits.len() {
-		3 => splits[2].parse().ok()?,
-		_ => 100,
-	};
-
-	let host = match HostDescription::new(host) {
-		Ok(h) => h,
-		Err(e) => {
-			warn!("Invalid hostname pattern {}: {}", host, e);
-			return None;
+		["tricot-https", raw_prefix, maybe_priority @ ..] => {
+			// priority is set to 100 when value is invalid or missing
+			let priority: u32 = maybe_priority
+				.iter()
+				.next()
+				.map_or(Ok(100), |x| x.parse::<u32>())
+				.unwrap_or(100);
+			UrlPrefix::new(raw_prefix)
+				.map(|prefix| ParsedTag::Frontend(MatchTag::HttpWithTls(prefix, priority)))
 		}
-	};
+		["tricot-add-header", header_key, header_values @ ..] => Some(ParsedTag::Middleware(
+			ConfigTag::AddHeader(header_key, header_values.join(" ")),
+		)),
+		["tricot-add-redirect", raw_match, raw_replace, maybe_raw_code @ ..] => {
+			let (p_match, p_replace) =
+				match (UrlPrefix::new(raw_match), UrlPrefix::new(raw_replace)) {
+					(Some(m), Some(r)) => (m, r),
+					_ => {
+						debug!(
+							"tag {} is ignored, one of the url prefix can't be parsed",
+							tag
+						);
+						return None;
+					}
+				};
 
-	Some(ProxyEntry {
-		target_addr,
-		https_target: (splits[0] == "tricot-https"),
-		host,
-		same_node,
-		same_site,
-		path_prefix,
-		priority,
-		add_headers: add_headers.to_vec(),
-		calls: atomic::AtomicI64::from(0),
-	})
-}
+			if matches!(p_replace.host, HostDescription::Pattern(_)) {
+				debug!(
+					"tag {} ignored as redirect to a glob pattern is not supported",
+					tag
+				);
+				return None;
+			}
 
-fn parse_tricot_add_header_tag(tag: &str) -> Option<(String, String)> {
-	let splits = tag.split(' ').collect::<Vec<_>>();
-	if splits.len() == 3 && splits[0] == "tricot-add-header" {
-		Some((splits[1].to_string(), splits[2].to_string()))
-	} else {
-		None
-	}
-}
-
-fn parse_consul_catalog(
-	catalog: &ConsulNodeCatalog,
-	same_node: bool,
-	same_site: bool,
-) -> Vec<ProxyEntry> {
-	trace!("Parsing node catalog: {:#?}", catalog);
-
-	let mut entries = vec![];
-
-	for (_, svc) in catalog.services.iter() {
-		let ip_addr = match svc.address.parse() {
-			Ok(ip) => ip,
-			_ => match catalog.node.address.parse() {
-				Ok(ip) => ip,
+			let maybe_parsed_code = maybe_raw_code
+				.iter()
+				.next()
+				.map(|c| c.parse::<u16>().ok())
+				.flatten();
+			let http_code = match maybe_parsed_code {
+				Some(301) => 301,
+				Some(302) => 302,
+				Some(303) => 303,
+				Some(307) => 307,
 				_ => {
-					warn!(
-						"Could not get address for service {} at node {}",
-						svc.service, catalog.node.node
+					debug!(
+						"tag {} has a missing or invalid http code, setting it to 302",
+						tag
 					);
-					continue;
+					302
 				}
-			},
-		};
-		let addr = SocketAddr::new(ip_addr, svc.port);
+			};
 
-		let (same_node, same_site) = if svc.tags.contains(&"tricot-global-lb".into()) {
-			(false, false)
-		} else if svc.tags.contains(&"tricot-site-lb".into()) {
-			(false, same_site)
-		} else {
-			(same_node, same_site)
-		};
-
-		let mut add_headers = vec![];
-		for tag in svc.tags.iter() {
-			if let Some(pair) = parse_tricot_add_header_tag(tag) {
-				add_headers.push(pair);
-			}
+			Some(ParsedTag::Middleware(ConfigTag::AddRedirect(
+				p_match, p_replace, http_code,
+			)))
 		}
+		["tricot-on-demand-tls-ask", url, ..] => {
+			Some(ParsedTag::Middleware(ConfigTag::OnDemandTlsAsk(url)))
+		}
+		["tricot-global-lb", ..] => Some(ParsedTag::Middleware(ConfigTag::GlobalLb)),
+		["tricot-local-lb", ..] => Some(ParsedTag::Middleware(ConfigTag::LocalLb)),
+		_ => None,
+	};
 
-		for tag in svc.tags.iter() {
-			if let Some(ent) = parse_tricot_tag(tag, addr, &add_headers[..], same_node, same_site) {
-				entries.push(ent);
+	trace!("tag {} parsed as {:?}", tag, parsed_tag);
+	parsed_tag
+}
+
+fn parse_consul_service(
+	s: &consul::catalog::HealthServiceNode,
+	mut flags: ProxyEntryFlags,
+) -> Vec<ProxyEntry> {
+	trace!("Parsing service: {:#?}", s);
+
+	let ip_addr = match s.service.address.parse() {
+		Ok(ip) => ip,
+		_ => match s.node.address.parse() {
+			Ok(ip) => ip,
+			_ => {
+				warn!(
+					"Could not get address for service {} at node {}",
+					s.service.service, s.node.node
+				);
+				return vec![];
 			}
+		},
+	};
+	let addr = SocketAddr::new(ip_addr, s.service.port);
+
+	// tag parsing
+	let mut collected_middleware = vec![];
+	let mut collected_frontends = vec![];
+	for tag in s.service.tags.iter() {
+		match parse_tricot_tags(tag) {
+			Some(ParsedTag::Frontend(x)) => collected_frontends.push(x),
+			Some(ParsedTag::Middleware(y)) => collected_middleware.push(y),
+			_ => trace!(
+				"service {}: tag '{}' could not be parsed",
+				s.service.service,
+				tag
+			),
 		}
 	}
 
-	trace!("Result of parsing catalog:");
+	// some legacy processing that would need a refactor later
+	for mid in collected_middleware.iter() {
+		match mid {
+			ConfigTag::GlobalLb => flags.global_lb = true,
+			ConfigTag::LocalLb => flags.site_lb = true,
+			_ => (),
+		};
+	}
+
+	// build proxy entries
+	let entries = collected_frontends
+		.into_iter()
+		.map(|frt| {
+			ProxyEntry::new(
+				s.service.service.clone(),
+				frt,
+				addr,
+				collected_middleware.as_ref(),
+				flags,
+			)
+		})
+		.collect::<Vec<_>>();
+
+	trace!("Result of parsing service:");
 	for ent in entries.iter() {
 		trace!("    {}", ent);
 	}
@@ -224,131 +406,132 @@ fn parse_consul_catalog(
 	entries
 }
 
-#[derive(Default)]
-struct NodeWatchState {
-	last_idx: Option<usize>,
-	last_catalog: Option<ConsulNodeCatalog>,
-	retries: u32,
-}
-
 pub fn spawn_proxy_config_task(
-	consul: Consul,
+	consul: consul::Consul,
+	local_node: String,
 	mut must_exit: watch::Receiver<bool>,
 ) -> watch::Receiver<Arc<ProxyConfig>> {
 	let (tx, rx) = watch::channel(Arc::new(ProxyConfig {
 		entries: Vec::new(),
 	}));
 
+	let metrics = ProxyConfigMetrics::new(rx.clone());
 	let consul = Arc::new(consul);
 
 	tokio::spawn(async move {
-		let mut nodes = HashMap::new();
-		let mut watches = FuturesUnordered::<BoxFuture<'static, (String, Result<_>)>>::new();
-
-		let mut node_site = HashMap::new();
+		let mut catalog_rx = consul.watch_all_service_health(Duration::from_secs(300));
+		let mut local_node_site = None;
 
 		while !*must_exit.borrow() {
-			let list_nodes = select! {
-				ln = consul.list_nodes() => ln,
+			select! {
+				_ = catalog_rx.changed() => (),
 				_ = must_exit.changed() => continue,
 			};
 
-			match list_nodes {
-				Ok(consul_nodes) => {
-					info!("Watched consul nodes: {:?}", consul_nodes);
-					for consul_node in consul_nodes {
-						let node = &consul_node.node;
-						if !nodes.contains_key(node) {
-							nodes.insert(node.clone(), NodeWatchState::default());
-
-							let node = node.to_string();
-							let consul = consul.clone();
-
-							watches.push(Box::pin(async move {
-								let res = consul.watch_node(&node, None).await;
-								(node, res)
-							}));
-						}
-						if let Some(site) = consul_node.meta.get("site") {
-							node_site.insert(node.clone(), site.clone());
+			let services = catalog_rx.borrow_and_update().clone();
+			if local_node_site.is_none() {
+				for (_, svcnodes) in services.iter() {
+					for svcnode in svcnodes.iter() {
+						if svcnode.node.node == local_node {
+							if let Some(site) = svcnode.node.meta.get("site") {
+								local_node_site = Some(site.to_string());
+							}
 						}
 					}
 				}
-				Err(e) => {
-					warn!("Could not get Consul node list: {}", e);
-				}
-			}
-
-			let next_watch = select! {
-				nw = watches.next() => nw,
-				_ = must_exit.changed() => continue,
-			};
-
-			let (node, res): (String, Result<_>) = match next_watch {
-				Some(v) => v,
-				None => {
-					warn!("No nodes currently watched in proxy_config.rs");
-					sleep(Duration::from_secs(10)).await;
-					continue;
-				}
-			};
-
-			match res {
-				Ok((catalog, new_idx)) => {
-					let mut watch_state = nodes.get_mut(&node).unwrap();
-					watch_state.last_idx = Some(new_idx);
-					watch_state.last_catalog = Some(catalog);
-					watch_state.retries = 0;
-
-					let idx = watch_state.last_idx;
-					let consul = consul.clone();
-					watches.push(Box::pin(async move {
-						let res = consul.watch_node(&node, idx).await;
-						(node, res)
-					}));
-				}
-				Err(e) => {
-					let mut watch_state = nodes.get_mut(&node).unwrap();
-					watch_state.retries += 1;
-					watch_state.last_idx = None;
-
-					let will_retry_in =
-						retry_to_time(watch_state.retries, Duration::from_secs(600));
-					error!(
-						"Failed to query consul for node {}. Will retry in {}s. {}",
-						node,
-						will_retry_in.as_secs(),
-						e
-					);
-
-					let consul = consul.clone();
-					watches.push(Box::pin(async move {
-						sleep(will_retry_in).await;
-						let res = consul.watch_node(&node, None).await;
-						(node, res)
-					}));
-					continue;
-				}
 			}
 
 			let mut entries = vec![];
-			for (node_name, watch_state) in nodes.iter() {
-				if let Some(catalog) = &watch_state.last_catalog {
-					let same_node = *node_name == consul.local_node;
-					let same_site =
-						match (node_site.get(node_name), node_site.get(&consul.local_node)) {
-							(Some(s1), Some(s2)) => s1 == s2,
-							_ => false,
-						};
 
-					entries.extend(parse_consul_catalog(catalog, same_node, same_site));
+			for (_service, svcnodes) in services.iter() {
+				for svcnode in svcnodes.iter() {
+					let healthy = !svcnode.checks.iter().any(|x| x.status == "critical");
+
+					let same_node = svcnode.node.node == local_node;
+					let same_site = match (svcnode.node.meta.get("site"), local_node_site.as_ref())
+					{
+						(Some(s1), Some(s2)) => s1 == s2,
+						_ => false,
+					};
+
+					let flags = ProxyEntryFlags {
+						healthy,
+						same_node,
+						same_site,
+						site_lb: false,
+						global_lb: false,
+					};
+
+					entries.extend(parse_consul_service(&svcnode, flags));
 				}
 			}
+
+			entries.sort_by_cached_key(|ent| ent.to_string());
+
 			let config = ProxyConfig { entries };
 
 			tx.send(Arc::new(config)).expect("Internal error");
 		}
+
+		drop(metrics); // ensure Metrics lives up to here
 	});
 
 	rx
 }
+
+// ----
+
+struct ProxyConfigMetrics {
+	_proxy_config_entries: metrics::ObservableGauge<u64>,
+}
+
+impl ProxyConfigMetrics {
+	fn new(rx: watch::Receiver<Arc<ProxyConfig>>) -> Self {
+		let meter = opentelemetry::global::meter("tricot");
+		Self {
+			_proxy_config_entries: meter
+				.u64_observable_gauge("proxy_config_entries")
+				.with_callback(move |observer| {
+					let mut patterns = HashMap::new();
+					for ent in rx.borrow().entries.iter() {
+						let attrs = (
+							ent.url_prefix.host.to_string(),
+							ent.url_prefix.path_prefix.clone().unwrap_or_default(),
+							ent.service_name.clone(),
+						);
+						*patterns.entry(attrs).or_default() += 1;
+					}
+					for ((host, prefix, svc), num) in patterns {
+						observer.observe(
+							num,
+							&[
+								KeyValue::new("host", host),
+								KeyValue::new("path_prefix", prefix),
+								KeyValue::new("service", svc),
+							],
+						);
+					}
+				})
+				.with_description("Number of proxy entries (back-ends) configured in Tricot")
+				.init(),
+		}
+	}
+}
+
+// ----
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn test_parse_tricot_add_header_tag() {
+		match parse_tricot_tags("tricot-add-header Content-Security-Policy default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'") {
+          Some(ParsedTag::Middleware(ConfigTag::AddHeader(name, value))) => {
+            assert_eq!(name, "Content-Security-Policy");
+            assert_eq!(value, "default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'");
+          }
+          _ => panic!("Passed a valid tag but the function says it is not valid")
+        }
+	}
+}

src/reverse_proxy.rs

@@ -8,9 +8,9 @@ use std::sync::Arc;
 use std::time::{Duration, SystemTime};
 
 use anyhow::Result;
-use log::*;
+use tracing::*;
 
-use http::header::HeaderName;
+use http::{header::HeaderName, StatusCode};
 use hyper::header::{HeaderMap, HeaderValue};
 use hyper::{client::HttpConnector, header, Body, Client, Request, Response, Uri};
 use rustls::client::{ServerCertVerified, ServerCertVerifier};
@@ -48,9 +48,25 @@ fn remove_hop_headers(headers: &HeaderMap<HeaderValue>) -> HeaderMap<HeaderValue
 	result
 }
 
-fn create_proxied_response<B>(mut response: Response<B>) -> Response<B> {
-	*response.headers_mut() = remove_hop_headers(response.headers());
-	response
+fn copy_upgrade_headers(
+	old_headers: &HeaderMap<HeaderValue>,
+	new_headers: &mut HeaderMap<HeaderValue>,
+) -> Result<bool> {
+	// The Connection header is stripped as it is a hop header that we are not supposed to proxy.
+	// However, it might also contain an Upgrade directive, e.g. for Websockets:
+	// when that happen, we do want to preserve that directive.
+	let mut is_upgrade = false;
+	if let Some(conn) = old_headers.get(header::CONNECTION) {
+		let conn_str = conn.to_str()?.to_lowercase();
+		if conn_str.split(',').map(str::trim).any(|x| x == "upgrade") {
+			if let Some(upgrade) = old_headers.get(header::UPGRADE) {
+				new_headers.insert(header::CONNECTION, "Upgrade".try_into()?);
+				new_headers.insert(header::UPGRADE, upgrade.clone());
+				is_upgrade = true;
+			}
+		}
+	}
+	Ok(is_upgrade)
 }
 
 fn forward_uri<B>(forward_url: &str, req: &Request<B>) -> Result<Uri> {
@@ -62,22 +78,23 @@ fn forward_uri<B>(forward_url: &str, req: &Request<B>) -> Result<Uri> {
 	Ok(Uri::from_str(forward_uri.as_str())?)
 }
 
-fn create_proxied_request<B>(
+fn create_proxied_request<B: std::default::Default>(
 	client_ip: IpAddr,
 	forward_url: &str,
 	request: Request<B>,
-) -> Result<Request<B>> {
+) -> Result<(Request<B>, Option<Request<B>>)> {
 	let mut builder = Request::builder()
 		.method(request.method())
 		.uri(forward_uri(forward_url, &request)?)
 		.version(hyper::Version::HTTP_11);
 
-	let headers = builder.headers_mut().unwrap();
+	let old_headers = request.headers();
+	let new_headers = builder.headers_mut().unwrap();
 
-	*headers = remove_hop_headers(request.headers());
+	*new_headers = remove_hop_headers(old_headers);
 
 	// If request does not have host header, add it from original URI authority
-	if let header::Entry::Vacant(entry) = headers.entry(header::HOST) {
+	if let header::Entry::Vacant(entry) = new_headers.entry(header::HOST) {
 		if let Some(authority) = request.uri().authority() {
 			entry.insert(authority.as_str().parse()?);
 		}
@@ -86,7 +103,7 @@ fn create_proxied_request<B>(
 	// Concatenate cookie headers into single header
 	// (HTTP/2 allows several cookie headers, but we are proxying to HTTP/1.1 that does not)
 	let mut cookie_concat = vec![];
-	for cookie in headers.get_all(header::COOKIE) {
+	for cookie in new_headers.get_all(header::COOKIE) {
 		if !cookie_concat.is_empty() {
 			cookie_concat.extend(b"; ");
 		}
@@ -94,12 +111,12 @@ fn create_proxied_request<B>(
 	}
 	if !cookie_concat.is_empty() {
 		// insert clears the old value of COOKIE and inserts the concatenated version instead
-		headers.insert(header::COOKIE, cookie_concat.try_into()?);
+		new_headers.insert(header::COOKIE, cookie_concat.try_into()?);
 	}
 
 	// Add forwarding information in the headers
 	let x_forwarded_for_header_name = "x-forwarded-for";
-	match headers.entry(x_forwarded_for_header_name) {
+	match new_headers.entry(x_forwarded_for_header_name) {
 		header::Entry::Vacant(entry) => {
 			entry.insert(client_ip.to_string().parse()?);
 		}
@@ -110,22 +127,63 @@ fn create_proxied_request<B>(
 		}
 	}
 
-	headers.insert(
+	new_headers.insert(
 		HeaderName::from_bytes(b"x-forwarded-proto")?,
 		"https".try_into()?,
 	);
 
 	// Proxy upgrade requests properly
-	if let Some(conn) = request.headers().get(header::CONNECTION) {
-		if conn.to_str()?.to_lowercase() == "upgrade" {
-			if let Some(upgrade) = request.headers().get(header::UPGRADE) {
-				headers.insert(header::CONNECTION, "Upgrade".try_into()?);
-				headers.insert(header::UPGRADE, upgrade.clone());
-			}
-		}
-	}
+	let is_upgrade = copy_upgrade_headers(old_headers, new_headers)?;
 
-	Ok(builder.body(request.into_body())?)
+	if is_upgrade {
+		Ok((builder.body(B::default())?, Some(request)))
+	} else {
+		Ok((builder.body(request.into_body())?, None))
+	}
+}
+
+async fn create_proxied_response<B: std::default::Default + Send + Sync + 'static>(
+	mut response: Response<B>,
+	upgrade_request: Option<Request<B>>,
+) -> Result<Response<B>> {
+	let old_headers = response.headers();
+
+	let mut new_headers = remove_hop_headers(old_headers);
+	copy_upgrade_headers(old_headers, &mut new_headers)?;
+
+	if response.status() == StatusCode::SWITCHING_PROTOCOLS {
+		if let Some(mut req) = upgrade_request {
+			let mut res_upgraded = hyper::upgrade::on(response).await?;
+
+			tokio::spawn(async move {
+				match hyper::upgrade::on(&mut req).await {
+					Ok(mut req_upgraded) => {
+						if let Err(e) =
+							tokio::io::copy_bidirectional(&mut req_upgraded, &mut res_upgraded)
+								.await
+						{
+							warn!("Error copying data in upgraded request: {}", e);
+						}
+					}
+					Err(e) => {
+						warn!(
+							"Could not upgrade client request when switching protocols: {}",
+							e
+						);
+					}
+				}
+			});
+
+			let mut new_res = Response::builder().status(StatusCode::SWITCHING_PROTOCOLS);
+			*new_res.headers_mut().unwrap() = new_headers;
+			Ok(new_res.body(B::default())?)
+		} else {
+			Err(anyhow!("Switching protocols but not an upgrade request"))
+		}
+	} else {
+		*response.headers_mut() = new_headers;
+		Ok(response)
+	}
 }
 
 pub async fn call(
@@ -133,7 +191,8 @@ pub async fn call(
 	forward_uri: &str,
 	request: Request<Body>,
 ) -> Result<Response<Body>> {
-	let proxied_request = create_proxied_request(client_ip, forward_uri, request)?;
+	let (proxied_request, upgrade_request) =
+		create_proxied_request(client_ip, forward_uri, request)?;
 
 	trace!("Proxied request: {:?}", proxied_request);
 
@@ -146,7 +205,7 @@ pub async fn call(
 
 	trace!("Inner response: {:?}", response);
 
-	let proxied_response = create_proxied_response(response);
+	let proxied_response = create_proxied_response(response, upgrade_request).await?;
 	Ok(proxied_response)
 }
 
@@ -155,7 +214,8 @@ pub async fn call_https(
 	forward_uri: &str,
 	request: Request<Body>,
 ) -> Result<Response<Body>> {
-	let proxied_request = create_proxied_request(client_ip, forward_uri, request)?;
+	let (proxied_request, upgrade_request) =
+		create_proxied_request(client_ip, forward_uri, request)?;
 
 	trace!("Proxied request (HTTPS): {:?}", proxied_request);
 
@@ -173,7 +233,7 @@ pub async fn call_https(
 
 	trace!("Inner response (HTTPS): {:?}", response);
 
-	let proxied_response = create_proxied_response(response);
+	let proxied_response = create_proxied_response(response, upgrade_request).await?;
 	Ok(proxied_response)
 }