Set the log level to LOG_LEVEL env variable (#417)

* set the log level to LOG_LEVEL env variable

* remove need for `var logger`

* swift-format

* [ci] update static sdk to 6.0.2

Author: sebsto

.github/workflows/pull_request.yml

@@ -47,12 +47,12 @@ jobs:
   # https://github.com/swiftlang/github-workflows/issues/34
   musl:
     runs-on: ubuntu-latest
-    container: swift:6.0-noble
+    container: swift:6.0.2-noble
     timeout-minutes: 30
     steps:
       - name: Check out code
         uses: actions/checkout@v4
       - name: Install SDK
-        run: swift sdk install https://download.swift.org/swift-6.0.1-release/static-sdk/swift-6.0.1-RELEASE/swift-6.0.1-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz --checksum d4f46ba40e11e697387468e18987ee622908bc350310d8af54eb5e17c2ff5481
+        run: swift sdk install https://download.swift.org/swift-6.0.2-release/static-sdk/swift-6.0.2-RELEASE/swift-6.0.2-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz --checksum aa5515476a403797223fc2aad4ca0c3bf83995d5427fb297cab1d93c68cee075
       - name: Build
         run: swift build --swift-sdk x86_64-swift-linux-musl

Sources/AWSLambdaRuntimeCore/LambdaRuntime.swift

@@ -33,6 +33,12 @@ public final class LambdaRuntime<Handler>: @unchecked Sendable where Handler: St
     ) {
         self.handlerMutex = NIOLockedValueBox(handler)
         self.eventLoop = eventLoop
+
+        // by setting the log level here, we understand it can not be changed dynamically at runtime
+        // developers have to wait for AWS Lambda to dispose and recreate a runtime environment to pickup a change
+        // this approach is less flexible but more performant than reading the value of the environment variable at each invocation
+        var log = logger
+        log.logLevel = Lambda.env("LOG_LEVEL").flatMap(Logger.Level.init) ?? .info
         self.logger = logger
     }