make basalt optionnal during compilation

.drone.yml

@@ -1,7 +1,21 @@
 kind: pipeline
 name: default
 
+workspace:
+  base: /drone
+
+clone:
+  disable: true
+
 steps:
+  - name: clone
+    image: alpine/git
+    commands:
+      - mkdir -p cargo
+      - git clone $DRONE_GIT_HTTP_URL
+      - cd netapp
+      - git checkout $DRONE_COMMIT
+
   - name: restore-cache
     image: meltwater/drone-cache:dev
     environment:
@@ -14,21 +28,29 @@ steps:
       restore: true
       archive_format: "gzip"
       bucket: drone-cache
-      cache_key: '{{ .Repo.Name }}_{{ checksum "Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
+      cache_key: '{{ .Repo.Name }}_{{ checksum "netapp/Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
       region: garage
       mount:
-        - 'target'
+        - 'netapp/target'
+        - 'cargo/registry/index'
+        - 'cargo/registry/cache'
+        - 'cargo/bin'
+        - 'cargo/git/db'
       path_style: true
       endpoint: https://garage.deuxfleurs.fr
 
   - name: build
     image: rustlang/rust:nightly
+    environment:
+      CARGO_HOME: /drone/cargo
     commands:
       - apt-get update
       - apt-get install --yes libsodium-dev
-      - cargo build
+      - cargo install cargo-all-features
+      - cd netapp
+      - cargo build-all-features
       - cargo build --example fullmesh
-      - cargo build --example basalt
+      - cargo build --example basalt --features "basalt"
 
   - name: rebuild-cache
     image: meltwater/drone-cache:dev
@@ -42,9 +64,13 @@ steps:
       rebuild: true
       archive_format: "gzip"
       bucket: drone-cache
-      cache_key: '{{ .Repo.Name }}_{{ checksum "Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
+      cache_key: '{{ .Repo.Name }}_{{ checksum "netapp/Cargo.lock" }}_{{ arch }}_{{ os }}_gzip'
       region: garage
       mount:
-        - 'target'
+        - 'netapp/target'
+        - 'cargo/registry/index'
+        - 'cargo/registry/cache'
+        - 'cargo/bin'
+        - 'cargo/git/db'
       path_style: true
       endpoint: https://garage.deuxfleurs.fr

Cargo.toml

@@ -14,6 +14,10 @@ categories = ["asynchronous", "network-programming"]
 [lib]
 name = "netapp"
 
+[features]
+default = []
+basalt = ["lru", "rand"]
+
 [dependencies]
 async-std = { version = "1.5.0", default-features = false }
 tokio = { version = "0.2", default-features = false, features = ["net", "tcp", "rt-core", "rt-threaded", "sync", "time", "macros"] }
@@ -24,7 +28,7 @@ hex = "0.4.2"
 base64 = "0.12.1"
 
 structopt = { version = "0.3", default-features = false }
-rand = "0.5.5"
+rand = { version = "0.5.5", optional = true }
 chrono = "0.4"
 
 log = "0.4.8"
@@ -33,8 +37,10 @@ arc-swap = "1.1"
 async-trait = "0.1.7"
 err-derive = "0.2.3"
 bytes = "0.6.0"
-lru = "0.6"
+lru = { version = "0.6", optional = true }
 
 sodiumoxide = { version = "0.2.5-0", package = "kuska-sodiumoxide" }
 kuska-handshake = { version = "0.1.2", features = ["default", "tokio_compat"] }
 
+[package.metadata.cargo-all-features]
+skip_optional_dependencies = true

src/peering/mod.rs

@@ -1,2 +1,4 @@
 pub mod fullmesh;
+
+#[cfg(feature = "basalt")]
 pub mod basalt;