Watch multiple consul nodes
This commit is contained in:
parent
bb77e7c459
commit
0682c74e9d
5 changed files with 245 additions and 26 deletions
115
Cargo.lock
generated
115
Cargo.lock
generated
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@ -28,6 +28,15 @@ dependencies = [
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"memchr",
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]
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[[package]]
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name = "ansi_term"
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version = "0.12.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
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dependencies = [
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"winapi 0.3.9",
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]
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[[package]]
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name = "anyhow"
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version = "1.0.51"
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@ -136,6 +145,21 @@ version = "1.4.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"
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[[package]]
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name = "clap"
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version = "2.34.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
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dependencies = [
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"ansi_term",
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"atty",
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"bitflags",
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"strsim",
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"textwrap",
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"unicode-width",
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"vec_map",
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]
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[[package]]
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name = "cloudabi"
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version = "0.0.3"
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@ -491,6 +515,15 @@ version = "0.11.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
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[[package]]
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name = "heck"
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version = "0.3.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
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dependencies = [
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"unicode-segmentation",
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]
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[[package]]
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name = "hermit-abi"
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version = "0.1.19"
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@ -994,6 +1027,30 @@ dependencies = [
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"log",
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]
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[[package]]
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name = "proc-macro-error"
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version = "1.0.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
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dependencies = [
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"proc-macro-error-attr",
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"proc-macro2",
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"quote",
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"syn",
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"version_check",
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]
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[[package]]
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name = "proc-macro-error-attr"
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version = "1.0.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
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dependencies = [
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"proc-macro2",
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"quote",
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"version_check",
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]
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[[package]]
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name = "proc-macro-hack"
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version = "0.5.19"
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@ -1453,6 +1510,36 @@ dependencies = [
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"bytes 0.4.12",
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]
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[[package]]
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name = "strsim"
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version = "0.8.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
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[[package]]
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name = "structopt"
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version = "0.3.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "40b9788f4202aa75c240ecc9c15c65185e6a39ccdeb0fd5d008b98825464c87c"
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dependencies = [
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"clap",
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"lazy_static",
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"structopt-derive",
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]
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[[package]]
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name = "structopt-derive"
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version = "0.4.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
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dependencies = [
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"heck",
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"proc-macro-error",
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "syn"
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version = "1.0.82"
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@ -1487,6 +1574,15 @@ dependencies = [
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"winapi-util",
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]
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[[package]]
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name = "textwrap"
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version = "0.11.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
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dependencies = [
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"unicode-width",
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]
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[[package]]
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name = "time"
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version = "0.1.43"
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@ -1796,6 +1892,7 @@ dependencies = [
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"rustls-pemfile",
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"serde",
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"serde_json",
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"structopt",
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"tokio 1.14.0",
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"tokio-rustls",
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"unicase",
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@ -1831,6 +1928,18 @@ dependencies = [
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"tinyvec",
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]
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[[package]]
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name = "unicode-segmentation"
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version = "1.8.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
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[[package]]
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name = "unicode-width"
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version = "0.1.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
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[[package]]
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name = "unicode-xid"
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version = "0.2.2"
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@ -1880,6 +1989,12 @@ version = "0.2.15"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
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[[package]]
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name = "vec_map"
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version = "0.8.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
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[[package]]
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name = "version_check"
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version = "0.9.3"
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@ -30,3 +30,4 @@ http = "0.2"
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hyper-reverse-proxy = "0.4"
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unicase = "2"
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lazy_static = "1.4"
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structopt = "0.3"
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@ -7,6 +7,12 @@ use reqwest::StatusCode;
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use serde::{Deserialize, Serialize};
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// ---- Watch and retrieve Consul catalog ----
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//
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#[derive(Serialize, Deserialize, Debug)]
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pub struct ConsulNodeListNode {
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#[serde(rename = "Node")]
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pub node: String,
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}
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#[derive(Serialize, Deserialize, Debug)]
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pub struct ConsulServiceEntry {
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@ -59,8 +65,6 @@ pub struct Consul {
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url: String,
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kv_prefix: String,
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idx: Option<u64>,
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pub local_node: String,
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}
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@ -70,29 +74,36 @@ impl Consul {
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client: reqwest::Client::new(),
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url: url.to_string(),
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kv_prefix: kv_prefix.to_string(),
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idx: None,
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local_node: local_node.into(),
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};
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}
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pub fn watch_node_reset(&mut self) -> () {
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self.idx = None;
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pub async fn list_nodes(&self) -> Result<Vec<String>> {
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debug!("list_nodes");
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let url = format!("{}/v1/catalog/nodes", self.url);
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let http = self.client.get(&url).send().await?;
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let resp: Vec<ConsulNodeListNode> = http.json().await?;
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Ok(resp.into_iter().map(|n| n.node).collect::<Vec<_>>())
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}
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pub async fn watch_node(&mut self, host: &str) -> Result<ConsulNodeCatalog> {
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let url = match self.idx {
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pub async fn watch_node(&self, host: &str, idx: Option<usize>) -> Result<(ConsulNodeCatalog, usize)> {
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debug!("watch_node {} {:?}", host, idx);
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let url = match idx {
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Some(i) => format!("{}/v1/catalog/node/{}?index={}", self.url, host, i),
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None => format!("{}/v1/catalog/node/{}", self.url, host),
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};
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let http = self.client.get(&url).send().await?;
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self.idx = match http.headers().get("X-Consul-Index") {
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Some(v) => Some(v.to_str()?.parse::<u64>()?),
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None => return Err(anyhow!("X-Consul-Index header not found")),
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let new_idx = match http.headers().get("X-Consul-Index") {
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Some(v) => v.to_str()?.parse::<usize>()?,
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None => bail!("X-Consul-Index header not found"),
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};
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let resp: ConsulNodeCatalog = http.json().await?;
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return Ok(resp);
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return Ok((resp, new_idx));
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}
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// ---- KV get and put ----
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23
src/main.rs
23
src/main.rs
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@ -1,6 +1,8 @@
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#[macro_use]
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extern crate anyhow;
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use structopt::StructOpt;
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mod cert;
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mod cert_store;
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mod consul;
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@ -11,15 +13,34 @@ mod reverse_proxy;
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use log::*;
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#[derive(StructOpt, Debug)]
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#[structopt(name = "tricot")]
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struct Opt {
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/// Address of consul server
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#[structopt(long = "consul-addr", env = "TRICOT_CONSUL_HOST", default_value = "http://127.0.0.1:8500/")]
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pub consul_addr: String,
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/// Prefix of Tricot's entries in Consul KV space
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#[structopt(long = "consul-kv-prefix", env = "TRICOT_CONSUL_KV_PREFIX", default_value = "tricot/")]
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pub consul_kv_prefix: String,
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/// Node name
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#[structopt(long = "node-name", env = "TRICOT_NODE_NAME", default_value = "<none>")]
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pub node_name: String,
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}
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#[tokio::main(flavor = "multi_thread", worker_threads = 10)]
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async fn main() {
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if std::env::var("RUST_LOG").is_err() {
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std::env::set_var("RUST_LOG", "tricot=debug")
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}
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pretty_env_logger::init();
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let opt = Opt::from_args();
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info!("Starting Tricot");
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let consul = consul::Consul::new("http://10.42.0.21:8500", "tricot/", "carcajou");
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let consul = consul::Consul::new(&opt.consul_addr, &opt.consul_kv_prefix, &opt.node_name);
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let mut rx_proxy_config = proxy_config::spawn_proxy_config_task(consul.clone());
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let cert_store = cert_store::CertStore::new(consul.clone());
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@ -1,7 +1,13 @@
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use std::net::SocketAddr;
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use std::sync::{atomic, Arc};
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use std::collections::HashMap;
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use std::{cmp, time::Duration};
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use anyhow::Result;
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use futures::stream::{FuturesUnordered, StreamExt};
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use futures::future::{BoxFuture};
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use log::*;
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use tokio::{sync::watch, time::sleep};
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@ -63,7 +69,7 @@ fn parse_tricot_tag(target_addr: SocketAddr, tag: &str) -> Option<ProxyEntry> {
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})
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}
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fn parse_consul_catalog(catalog: &ConsulNodeCatalog) -> ProxyConfig {
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fn parse_consul_catalog(catalog: &ConsulNodeCatalog) -> Vec<ProxyEntry> {
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let mut entries = vec![];
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for (_, svc) in catalog.services.iter() {
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@ -79,37 +85,102 @@ fn parse_consul_catalog(catalog: &ConsulNodeCatalog) -> ProxyConfig {
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}
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}
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ProxyConfig { entries }
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entries
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}
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pub fn spawn_proxy_config_task(mut consul: Consul) -> watch::Receiver<Arc<ProxyConfig>> {
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#[derive(Default)]
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struct NodeWatchState {
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last_idx: Option<usize>,
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last_catalog: Option<ConsulNodeCatalog>,
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retries: u32,
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}
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pub fn spawn_proxy_config_task(consul: Consul) -> watch::Receiver<Arc<ProxyConfig>> {
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let (tx, rx) = watch::channel(Arc::new(ProxyConfig {
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entries: Vec::new(),
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}));
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let consul = Arc::new(consul);
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tokio::spawn(async move {
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let mut retries = 0;
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let node = consul.local_node.clone();
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let mut nodes = HashMap::new();
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let mut watches = FuturesUnordered::<BoxFuture<'static, (String, Result<_>)>>::new();
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loop {
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let catalog = match consul.watch_node(&node).await {
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Ok(c) => c,
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match consul.list_nodes().await {
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Ok(consul_nodes) => {
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info!("Watched consul nodes: {:?}", consul_nodes);
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for node in consul_nodes {
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if !nodes.contains_key(&node) {
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nodes.insert(node.clone(), NodeWatchState::default());
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let node = node.to_string();
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let consul = consul.clone();
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watches.push(Box::pin(async move {
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let res = consul.watch_node(&node, None).await;
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(node, res)
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}));
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}
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}
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}
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Err(e) => {
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consul.watch_node_reset();
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retries = cmp::min(std::u32::MAX - 1, retries) + 1;
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let will_retry_in = retry_to_time(retries, Duration::from_secs(600));
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warn!("Could not get Consul node list: {}", e);
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}
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}
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let (node, res): (String, Result<_>) = match watches.next().await {
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Some(v) => v,
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None => {
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warn!("No nodes currently watched in proxy_config.rs");
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sleep(Duration::from_secs(10)).await;
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continue;
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}
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};
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match res {
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Ok((catalog, new_idx)) => {
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let mut watch_state = nodes.get_mut(&node).unwrap();
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watch_state.last_idx = Some(new_idx);
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watch_state.last_catalog = Some(catalog);
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watch_state.retries = 0;
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let idx = watch_state.last_idx;
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let consul = consul.clone();
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watches.push(Box::pin(async move {
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let res = consul.watch_node(&node, idx).await;
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(node, res)
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}));
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}
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Err(e) => {
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let mut watch_state = nodes.get_mut(&node).unwrap();
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watch_state.retries += 1;
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watch_state.last_idx = None;
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let will_retry_in = retry_to_time(watch_state.retries, Duration::from_secs(600));
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error!(
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"Failed to query consul. Will retry in {}s. {}",
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will_retry_in.as_secs(),
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e
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);
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sleep(will_retry_in).await;
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let consul = consul.clone();
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watches.push(Box::pin(async move {
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sleep(will_retry_in).await;
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let res = consul.watch_node(&node, None).await;
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(node, res)
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}));
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continue;
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}
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};
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retries = 0;
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}
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let config = parse_consul_catalog(&catalog);
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let mut entries = vec![];
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for (_, watch_state) in nodes.iter() {
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if let Some(catalog) = &watch_state.last_catalog {
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entries.extend(parse_consul_catalog(catalog));
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}
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}
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let config = ProxyConfig { entries };
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debug!("Extracted configuration: {:#?}", config);
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tx.send(Arc::new(config)).expect("Internal error");
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