lambda local

Dockerfile

@@ -0,0 +1,11 @@
+FROM public.ecr.aws/lambda/nodejs:20
+
+# Copy function code
+COPY dist ${LAMBDA_TASK_ROOT}/dist
+COPY package.json package-lock.json  ${LAMBDA_TASK_ROOT}
+
+# Install NPM dependencies for function
+RUN npm install --omit=dev
+
+# Set the CMD to your handler (could also be done as a parameter override outside of the Dockerfile)
+# CMD [ "dist/addition.handler" ]

auto/lambda-local-logs

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd $(dirname $0)/..
+
+docker-compose -f compose.local.yaml logs -f

auto/lambda-local-start

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd $(dirname $0)/..
+
+docker-compose run --rm install
+docker-compose run --rm compile
+docker-compose -f compose.local.yaml build
+docker-compose -f compose.local.yaml up -d

auto/lambda-local-stop

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd $(dirname $0)/..
+
+docker-compose -f compose.local.yaml down

compose.local.yaml

@@ -0,0 +1,15 @@
+version: '3.9'
+services:
+  # curl -XPOST "http://localhost:9001/2015-03-31/functions/function/invocations" -d '{"a":2,"b":3}'
+  addition:
+    build: .
+    ports:
+      - '9001:8080'
+    command: dist/addition.handler
+
+  # curl -XPOST "http://localhost:9002/2015-03-31/functions/function/invocations" -d '{"a":5,"b":3}'
+  subtraction:
+    build: .
+    ports:
+      - '9002:8080'
+    command: dist/subtraction.handler

docker-compose.yml → compose.yaml

@@ -18,3 +18,7 @@ services:
   test:
     <<: *base
     command: npm test
+
+  compile:
+    <<: *base
+    command: npm run compile

package.json

@@ -23,6 +23,7 @@
   },
   "homepage": "https://github.com/brainstation-au/aws-lambda-container-nodejs#readme",
   "devDependencies": {
+    "@types/aws-lambda": "^8.10.129",
     "@types/eslint": "^8.44.7",
     "@types/jest": "^29.5.10",
     "@types/node": "^20.10.0",

src/addition.spec.ts

@@ -0,0 +1,18 @@
+import { Callback, Context } from 'aws-lambda';
+import { handler } from './addition';
+
+describe('addition', () => {
+  describe('handler', () => {
+    test('2 and 3 adds up to 5', async () => {
+      await expect(handler({a: 2, b: 3}, {} as Context, {} as Callback)).resolves.toEqual(5);
+    });
+
+    test('invalid event structure', async () => {
+      await expect(handler({a: 2}, {} as Context, {} as Callback)).rejects.toThrow();
+    });
+
+    test('invalid data types', async () => {
+      await expect(handler({a: 'x', b: 'y'}, {} as Context, {} as Callback)).rejects.toThrow();
+    });
+  });
+});

src/addition.ts

@@ -0,0 +1,10 @@
+import { Handler } from 'aws-lambda';
+
+export const handler: Handler = async (event) => {
+  if ('a' in event && typeof event['a'] == 'number'
+  && 'b' in event && typeof event['b'] == 'number') {
+    return event['a'] + event['b'];
+  } else {
+    throw new Error('event doesn\'t satisfy the type { a: number, b: number }');
+  }
+};

src/subtraction.spec.ts

@@ -0,0 +1,18 @@
+import { Callback, Context } from 'aws-lambda';
+import { handler } from './subtraction';
+
+describe('subtraction', () => {
+  describe('handler', () => {
+    test('2 take away 3 returns -1', async () => {
+      await expect(handler({a: 2, b: 3}, {} as Context, {} as Callback)).resolves.toEqual(-1);
+    });
+
+    test('invalid event structure', async () => {
+      await expect(handler({a: 2}, {} as Context, {} as Callback)).rejects.toThrow();
+    });
+
+    test('invalid data types', async () => {
+      await expect(handler({a: 'x', b: 'y'}, {} as Context, {} as Callback)).rejects.toThrow();
+    });
+  });
+});

src/subtraction.ts

@@ -0,0 +1,10 @@
+import { Handler } from 'aws-lambda';
+
+export const handler: Handler = async (event) => {
+  if ('a' in event && typeof event['a'] == 'number'
+  && 'b' in event && typeof event['b'] == 'number') {
+    return event['a'] - event['b'];
+  } else {
+    throw new Error('event doesn\'t satisfy the type { a: number, b: number }');
+  }
+};