feat: make GOARCH configurable in Makefile and auto-detect in installer

apm-lambda-extension/Makefile

@@ -1,10 +1,9 @@
 build:
-	GOOS=linux GOARCH=amd64 go build -o bin/extensions/apm-lambda-extension main.go
-
-build-GoExampleExtensionLayer:
-	GOOS=linux GOARCH=amd64 go build -o $(ARTIFACTS_DIR)/extensions/apm-lambda-extension main.go
-	chmod +x $(ARTIFACTS_DIR)/extensions/apm-lambda-extension
-
+ifndef GOARCH
+	GOARCH=amd64
+endif
+	GOOS=linux go build -o bin/extensions/apm-lambda-extension main.go
+	chmod +x bin/extensions/apm-lambda-extension
 build-and-publish:
 ifndef AWS_DEFAULT_REGION
 	$(error AWS_DEFAULT_REGION is undefined)
@@ -18,11 +17,15 @@ endif
 ifndef ELASTIC_LAYER_NAME
 	$(error ELASTIC_LAYER_NAME is undefined)
 endif
-	make build
-	cd bin && rm -f extension.zip || true && zip -r extension.zip extensions
+	GOARCH=${GOARCH} make build
+	GOARCH=${GOARCH} make zip
 	aws lambda publish-layer-version --layer-name "${ELASTIC_LAYER_NAME}" --zip-file "fileb://./bin/extension.zip"
-run-GoExampleExtensionLayer:
-	go run apm-lambda-extension/main.go
-
+zip:
+	cd bin && rm -f extension.zip || true && zip -r extension.zip extensions && cp extension.zip ${GOARCH}.zip
 test:
 	go test extension/*.go -v
+env:
+ifndef GOARCH
+	export GOARCH=amd64
+endif
+	env

apm-lambda-extension/cli/build-and-publish.js

@@ -30,6 +30,7 @@ function getLastJsonFromShellOutput(output) {
       jsonLines.push(line)
     }
   }
+
   const string = jsonLines.join('')
   const object = JSON.parse(string)
   return object

apm-lambda-extension/cli/install.js

@@ -15,6 +15,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
+const AWS = require('aws-sdk')
+AWS.config.update({region: process.env.AWS_DEFAULT_REGION});
 const fs = require('fs')
 const yaml = require('js-yaml')
 const { exec, /*execFile*/ } = require("child_process")
@@ -58,16 +60,33 @@ async function cmd(argv) {
   config.lambda_env.ELASTIC_APM_LAMBDA_APM_SERVER = config.lambda_env.ELASTIC_APM_SERVER_URL
   config.lambda_env.ELASTIC_APM_SERVER_URL = 'http://localhost:8200'
 
+  const lambda = new AWS.Lambda({apiVersion:'2015-03-31'})
+  const configuration = await lambda.getFunction({
+    FunctionName: config.function_name
+  }).promise();
+  console.log(configuration.Configuration.Architectures.length)
+  if( !Array.isArray(configuration.Configuration.Architectures) ||
+      configuration.Configuration.Architectures.length !== 1) {
+        console.log("Unexpected configuration.Configuration.Architectures type from function, exiting.")
+        process.exit(1)
+  }
+
+  const arch = configuration.Configuration.Architectures.pop()
+  if(arch !== 'arm64' && arch != 'amd64') {
+    console.log("Unexpected configuration.Configuration.Architectures value, exiting.")
+    process.exit(1)
+  }
 
   // run command to set env variables
   try {
+    process.env['GOARCH'] = arch
     const output = await runShellCommand(
       __dirname + '/elastic-lambda.js',
       ['update-function-env',config.function_name, JSON.stringify(config.lambda_env)],
       'updating lambda function\'s env variables'
     )
-    console.log(output)
   } catch(error) {
+    console.log(error)
     console.log('encountered error, exiting')
     process.exit(1)
   }