ruselknow · October 17, 2019 22:36 · Jun 18, 2018 · Jun 18, 2018 · Jun 18, 2018
diff --git a/setup.sh b/setup.sh
@@ -15,7 +15,7 @@ awslocal lambda create-function \
     --runtime nodejs8.10 \
     --handler lambda.apiHandler \
     --memory-size 128 \
-    --zip-file fileb://apiHandler.zip \
+    --zip-file fileb://api-handler.zip \
     --role arn:aws:iam::123456:role/irrelevant
 
 [ $? == 0 ] || fail 1 "Failed: AWS / lambda / create-function"

diff --git a/README.md b/README.md
@@ -0,0 +1,20 @@
+
+## About
+
+Example on how to run locally an AWS Lambda via API Gateway using [localstack](https://github.com/localstack/localstack).
+
+Based on...
+1. https://stackoverflow.com/questions/44547574/create-api-gateway-in-localstack/48682628
+1. https://ig.nore.me/2016/03/setting-up-lambda-and-a-gateway-through-the-cli/
+
+## Usage
+
+1. Build a zip containing `lambda.js`, name it `api-handler.zip`
+1. Launch localstack in whatever way you can. See sample `docker-compose.yml`.
+1. Run `setup.sh`
+
+## Pending
+
+1. ~~Catch any URL `/api/whatever`~~.
+1. Pass all HTTP verbs. Only `GET` is configured here. Other verbs require their own integration as `ANY` [is not supported yet](https://github.com/localstack/localstack/issues/667).
+1. No query parameters yet.
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -0,0 +1,18 @@
+version: '2.1'
+
+services:
+  localstack:
+    image: localstack/localstack
+    ports:
+      - "4567-4583:4567-4583"
+      - "${PORT_WEB_UI-4566}:${PORT_WEB_UI-8080}"
+    environment:
+      - SERVICES=${SERVICES-lambda,apigateway }
+      - DEBUG=${DEBUG- }
+      - DATA_DIR=${DATA_DIR- }
+      - PORT_WEB_UI=${PORT_WEB_UI- }
+      - LAMBDA_EXECUTOR=${LAMBDA_EXECUTOR-docker-reuse }
+      - KINESIS_ERROR_PROBABILITY=${KINESIS_ERROR_PROBABILITY- }
+      - DOCKER_HOST=unix:///var/run/docker.sock
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock"
diff --git a/lambda.js b/lambda.js
@@ -0,0 +1,18 @@
+'use strict'
+
+const apiHandler = (payload, context, callback) => {
+    console.log(`Function apiHandler called with payload ${JSON.stringify(payload)}`);
+    callback(null, {
+        statusCode: 201,
+        body: JSON.stringify({
+            message: 'Hello World'
+        }),
+        headers: {
+            'X-Custom-Header': 'ASDF'
+        }
+    }); 
+}
+
+module.exports = {
+    apiHandler,
+}
diff --git a/setup.sh b/setup.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+API_NAME=api
+REGION=us-east-1
+STAGE=test
+
+function fail() {
+    echo $2
+    exit $1
+}
+
+awslocal lambda create-function \
+    --region ${REGION} \
+    --function-name ${API_NAME} \
+    --runtime nodejs8.10 \
+    --handler lambda.apiHandler \
+    --memory-size 128 \
+    --zip-file fileb://apiHandler.zip \
+    --role arn:aws:iam::123456:role/irrelevant
+
+[ $? == 0 ] || fail 1 "Failed: AWS / lambda / create-function"
+
+LAMBDA_ARN=$(awslocal lambda list-functions --query "Functions[?FunctionName==\`${API_NAME}\`].FunctionArn" --output text --region ${REGION})
+
+awslocal apigateway create-rest-api \
+    --region ${REGION} \
+    --name ${API_NAME}
+
+[ $? == 0 ] || fail 2 "Failed: AWS / apigateway / create-rest-api"
+
+API_ID=$(awslocal apigateway get-rest-apis --query "items[?name==\`${API_NAME}\`].id" --output text --region ${REGION})
+PARENT_RESOURCE_ID=$(awslocal apigateway get-resources --rest-api-id ${API_ID} --query 'items[?path==`/`].id' --output text --region ${REGION})
+
+awslocal apigateway create-resource \
+    --region ${REGION} \
+    --rest-api-id ${API_ID} \
+    --parent-id ${PARENT_RESOURCE_ID} \
+    --path-part "{somethingId}"
+
+[ $? == 0 ] || fail 3 "Failed: AWS / apigateway / create-resource"
+
+RESOURCE_ID=$(awslocal apigateway get-resources --rest-api-id ${API_ID} --query 'items[?path==`/{somethingId}`].id' --output text --region ${REGION})
+
+awslocal apigateway put-method \
+    --region ${REGION} \
+    --rest-api-id ${API_ID} \
+    --resource-id ${RESOURCE_ID} \
+    --http-method GET \
+    --request-parameters "method.request.path.somethingId=true" \
+    --authorization-type "NONE" \
+
+[ $? == 0 ] || fail 4 "Failed: AWS / apigateway / put-method"
+
+awslocal apigateway put-integration \
+    --region ${REGION} \
+    --rest-api-id ${API_ID} \
+    --resource-id ${RESOURCE_ID} \
+    --http-method GET \
+    --type AWS_PROXY \
+    --integration-http-method POST \
+    --uri arn:aws:apigateway:${REGION}:lambda:path/2015-03-31/functions/${LAMBDA_ARN}/invocations \
+    --passthrough-behavior WHEN_NO_MATCH \
+
+[ $? == 0 ] || fail 5 "Failed: AWS / apigateway / put-integration"
+
+awslocal apigateway create-deployment \
+    --region ${REGION} \
+    --rest-api-id ${API_ID} \
+    --stage-name ${STAGE} \
+
+[ $? == 0 ] || fail 6 "Failed: AWS / apigateway / create-deployment"
+
+ENDPOINT=http://localhost:4567/restapis/${API_ID}/${STAGE}/_user_request_/HowMuchIsTheFish
+
+echo "API available at: ${ENDPOINT}"
+
+echo "Testing GET:"
+curl -i ${ENDPOINT}
+
+echo "Testing POST:"
+curl -iX POST ${ENDPOINT}