allow for rust options at the function level

Author: softprops

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 * bump lambda rust docker version to 0.1.0-rust-1.27.2
 * speed up deployments by ~3.2 seconds by disabling excludeDevDependencies. it's on by default but it's not useful for for Rust focused services
+* the `custom.rust` config object can be overrided at the function level
+
+```yaml
+functions:
+  hello:
+    rust:
+      cargoFlags: '--features ...'
+    handler: liblambda.handler
+    package:
+      include:
+        - liblambda.so
+    events:
+      - schedule: rate(5 minutes)
+```
 
 # 0.1.3
 

index.js

@@ -38,7 +38,7 @@ class ServerlessPlugin {
     this.artifacts = [];
   }
 
-  runDocker(args, captureOutput) {
+  runDocker(funcArgs, captureOutput) {
     const defaultArgs = [
       'run',
       '--rm',
@@ -47,9 +47,10 @@ class ServerlessPlugin {
       `-v`, `${process.env['HOME']}/.cargo/git:/root/.cargo/git`,
     ];
     const customArgs = [];
-    if (this.custom.cargoFlags) {
+    const cargoFlags = (funcArgs || {}).cargoFlags || this.custom.cargoFlags;
+    if (cargoFlags) {
       // --features python3-sys, ect
-      customArgs.push('-e', `CARGO_FLAGS=${this.custom.cargoFlags}`);
+      customArgs.push('-e', `CARGO_FLAGS=${cargoFlags}`);
     };
     return spawnSync(
       'docker',
@@ -68,7 +69,7 @@ class ServerlessPlugin {
       const func = service.getFunction(funcName);
       const [crate, fn] = func.handler.split('.');
       this.serverless.cli.log(`Building native Rust ${func.handler} func...`);
-      const res = this.runDocker();
+      const res = this.runDocker(func.rust);
       if (res.error || res.status > 0) {
         this.serverless.cli.log(`Dockerized Rust build encountered an error.`);
         throw new Error(res.error);