return an HTTP 5xx error in case we mess up something in the Pool

Sebastien Stormacq · Sebastien Stormacq · commit ab77e5a8bb47 · 2025-10-17T12:35:08.000+02:00
diff --git a/Sources/AWSLambdaRuntime/Lambda+LocalServer.swift b/Sources/AWSLambdaRuntime/Lambda+LocalServer.swift
@@ -428,11 +428,11 @@ internal struct LambdaHTTPServer {
                     }
                 }
             } catch let error as LambdaHTTPServer.Pool<LambdaHTTPServer.LocalServerResponse>.PoolError {
-                logger.trace("PoolError caught")
+                logger.trace("PoolError caught", metadata: ["error": "\(error)"])
                 // detect concurrent invocations of POST and gently decline the requests while we're processing one.
                 let response = LocalServerResponse(
                     id: requestId,
-                    status: .badRequest,
+                    status: .internalServerError,
                     body: ByteBuffer(
                         string:
                             "\(error): It is not allowed to invoke multiple Lambda function executions in parallel. (The Lambda runtime environment on AWS will never do that)"

Original file line number	Diff line number	Diff line change
`@@ -428,11 +428,11 @@ internal struct LambdaHTTPServer {`
`428`	`428`	`}`
`429`	`429`	`}`
`430`	`430`	`} catch let error as LambdaHTTPServer.Pool<LambdaHTTPServer.LocalServerResponse>.PoolError {`
`431`		`- logger.trace("PoolError caught")`
	`431`	`+ logger.trace("PoolError caught", metadata: ["error": "\(error)"])`
`432`	`432`	`// detect concurrent invocations of POST and gently decline the requests while we're processing one.`
`433`	`433`	`let response = LocalServerResponse(`
`434`	`434`	`id: requestId,`
`435`		`- status: .badRequest,`
	`435`	`+ status: .internalServerError,`
`436`	`436`	`body: ByteBuffer(`
`437`	`437`	`string:`
`438`	`438`	`"\(error): It is not allowed to invoke multiple Lambda function executions in parallel. (The Lambda runtime environment on AWS will never do that)"`