From fe99c85704997343aded82b85c3cc0cbd936c34a Mon Sep 17 00:00:00 2001 From: Brett Andrews Date: Wed, 19 Jun 2019 12:08:50 -0700 Subject: [PATCH] feat: add custom mapping example * Request mapping functions must now return the body * Renamed CONTEXT_SUCCEED to CONTEXT * socketPath no longer needs to be returned by request mapping function --- README.md | 65 +- __tests__/unit.js | 19 +- examples/alb/README.md | 10 +- examples/alb/src/lambda.js | 5 +- examples/basic-starter/package.json | 2 +- examples/custom-mapper-dynamodb/.gitignore | 2 + examples/custom-mapper-dynamodb/README.md | 8 + .../dynamodb-event.json | 28 + examples/custom-mapper-dynamodb/local.js | 28 + .../custom-mapper-dynamodb/package-lock.json | 1182 +++++++++++++++++ examples/custom-mapper-dynamodb/package.json | 22 + examples/custom-mapper-dynamodb/src/app.js | 58 + .../src/dynamodb-event-mappings.js | 51 + examples/custom-mapper-dynamodb/src/lambda.js | 16 + .../src/package-lock.json | 1101 +++++++++++++++ examples/custom-mapper-dynamodb/template.yaml | 38 + src/event-mappings/alb.js | 2 +- src/event-mappings/api-gateway.js | 2 +- src/event-mappings/lambda-edge.js | 2 +- src/event-mappings/utils.js | 17 +- src/transport.js | 16 +- src/utils.js | 9 - 22 files changed, 2631 insertions(+), 52 deletions(-) create mode 100644 examples/custom-mapper-dynamodb/.gitignore create mode 100644 examples/custom-mapper-dynamodb/README.md create mode 100644 examples/custom-mapper-dynamodb/dynamodb-event.json create mode 100644 examples/custom-mapper-dynamodb/local.js create mode 100644 examples/custom-mapper-dynamodb/package-lock.json create mode 100644 examples/custom-mapper-dynamodb/package.json create mode 100644 examples/custom-mapper-dynamodb/src/app.js create mode 100644 examples/custom-mapper-dynamodb/src/dynamodb-event-mappings.js create mode 100644 examples/custom-mapper-dynamodb/src/lambda.js create mode 100644 examples/custom-mapper-dynamodb/src/package-lock.json create mode 100644 examples/custom-mapper-dynamodb/template.yaml diff --git a/README.md b/README.md index 5abd81fe..78aca8ba 100644 --- a/README.md +++ b/README.md @@ -13,15 +13,13 @@ npm install aws-serverless-express ```js // lambda.js -const awsServerlessExpress = require('aws-serverless-express') +const { configure } = require('aws-serverless-express') const app = require('./app') -const servererlessExpress = awsServerlessExpress.configure({ -}) - -exports.handler = (event, context) => { awsServerlessExpress.proxy(server, event, context) } +const servererlessExpress = configure({ app }) +exports.handler = servererlessExpress.handler ``` -[Package and create your Lambda function](http://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html), then configure a simple proxy API using Amazon API Gateway and integrate it with your Lambda function. +[Package and create your Lambda function](http://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html), then configure a simple proxy API using Amazon API Gateway and integrate it with your Lambda function. See the [basic starter example](examples/basic-starter) to get started. ## Quick Start/Example @@ -32,7 +30,60 @@ Want to get up and running quickly? [Check out our basic starter example](exampl - [Serverless Application Model (SAM)](https://github.com/awslabs/serverless-application-model)/[CloudFormation](https://aws.amazon.com/cloudformation/aws-cloudformation-templates/) template - Helper scripts to configure, deploy, and manage your application -## Accessing the event and context objects +## API + +## resolutionMode + +Lambda supports three methods to end the execution and return a result: context, callback, and promise. By default, aws-serverless-express uses promise resolution, but you can specify 'CONTEXT' or 'CALLBACK' ('PROMISE' by default) if you need to change this. If you specify 'CALLBACK', then `context.callbackWaitsForEmptyEventLoop = false` is also set for you. + +```js +configure({ + app, + resolutionMode: 'CALLBACK' +}) +``` + +## eventFns + +aws-serverless-express natively supports API Gateway, ALB, and Lambda@Edge. If you want to use Express with other AWS Services which can invoke a Lambda Function you can provide your own custom request/response mappings via `eventFns`. See the [custom-mapper-dynamodb example](examples/custom-mapper-dynamodb). + +```js +function requestMapper ({ event }) { + // Your logic here... + + return { + method, + path, + headers + } +} + +function responseMapper ({ + statusCode, + body, + headers, + isBase64Encoded +}) { + // Your logic here... + + return { + statusCode, + body, + headers, + isBase64Encoded + } +} + +configure({ + app, + eventFns: { + request: requestMapper, + response: responseMapper + } +}) +``` + +### Accessing the event and context objects This package exposes a function to easily get the `event` and `context` objects Lambda receives from the event source. diff --git a/__tests__/unit.js b/__tests__/unit.js index e040833e..c9cc8307 100644 --- a/__tests__/unit.js +++ b/__tests__/unit.js @@ -75,36 +75,35 @@ function mapApiGatewayEventToHttpRequest (multiValueHeaders = {}) { const context = { 'foo': 'bar' } - const socketPath = '/tmp/server0.sock' - const httpRequest = awsServerlessExpressEventMappings.mapApiGatewayEventToHttpRequest({ event, context, socketPath }) + const httpRequest = awsServerlessExpressEventMappings.mapApiGatewayEventToHttpRequest({ event, context }) return {httpRequest, eventClone, context} } test('mapApiGatewayEventToHttpRequest: with headers', () => { const r = mapApiGatewayEventToHttpRequest({'x-foo': ['foo']}) - + expect(r.httpRequest.body).toBeInstanceOf(Buffer) + delete r.httpRequest.body expect(r.httpRequest).toEqual({ method: 'GET', path: '/foo', headers: { 'x-foo': 'foo', 'Content-Length': Buffer.byteLength('Hello serverless!') - }, - socketPath: '/tmp/server0.sock' + } }) }) test('mapApiGatewayEventToHttpRequest: without headers', () => { const r = mapApiGatewayEventToHttpRequest() - + expect(r.httpRequest.body).toBeInstanceOf(Buffer) + delete r.httpRequest.body expect(r.httpRequest).toEqual({ method: 'GET', path: '/foo', headers: { 'Content-Length': Buffer.byteLength('Hello serverless!') - }, - socketPath: '/tmp/server0.sock' + } }) }) @@ -376,13 +375,13 @@ describe('forwardResponse: content-type encoding', () => { }) describe('makeResolver', () => { - test('CONTEXT_SUCCEED (specified)', () => { + test('CONTEXT (specified)', () => { return new Promise( (resolve) => { const context = new MockContext(resolve) const contextResolver = awsServerlessExpressTransport.makeResolver({ context, - resolutionMode: 'CONTEXT_SUCCEED' + resolutionMode: 'CONTEXT' }) return contextResolver.succeed({ diff --git a/examples/alb/README.md b/examples/alb/README.md index a716fa60..a47aa692 100644 --- a/examples/alb/README.md +++ b/examples/alb/README.md @@ -1,6 +1,8 @@ ## Development -1. `npm pack ../..` -2. `npm install ./aws-serverless-express-3.3.5.tgz` -3. `npm install --prefix ./src ./` -4. `node local.js` \ No newline at end of file +```bash +npm pack ../.. +npm install ./aws-serverless-express-3.3.5.tgz +npm install --prefix ./src ./ +node local.js +``` diff --git a/examples/alb/src/lambda.js b/examples/alb/src/lambda.js index f67a53ab..fb4122c4 100644 --- a/examples/alb/src/lambda.js +++ b/examples/alb/src/lambda.js @@ -1,11 +1,8 @@ -// const awsServerlessExpress = require(process.env.NODE_ENV === 'test' ? '../../index' : 'aws-serverless-express') const awsServerlessExpress = require('aws-serverless-express') const app = require('./app') const ase = awsServerlessExpress.configure({ - app, - resolutionMode: 'PROMISE' - // eventSource: '' + app }) exports.handler = ase.handler diff --git a/examples/basic-starter/package.json b/examples/basic-starter/package.json index 715912ae..17dee76e 100644 --- a/examples/basic-starter/package.json +++ b/examples/basic-starter/package.json @@ -6,7 +6,7 @@ "config": { "s3BucketName": "sls-xpress2", "region": "us-east-1", - "cloudFormationStackName": "AwsServerlessExpressStackNew", + "cloudFormationStackName": "ServerlessExpress", "functionName": "AwsServerlessExpressStackNew-ExpressLambdaFunction-GU4XXGPADJ0E" }, "scripts": { diff --git a/examples/custom-mapper-dynamodb/.gitignore b/examples/custom-mapper-dynamodb/.gitignore new file mode 100644 index 00000000..6652e7c7 --- /dev/null +++ b/examples/custom-mapper-dynamodb/.gitignore @@ -0,0 +1,2 @@ +template.packaged.yaml +*.tgz \ No newline at end of file diff --git a/examples/custom-mapper-dynamodb/README.md b/examples/custom-mapper-dynamodb/README.md new file mode 100644 index 00000000..7f253106 --- /dev/null +++ b/examples/custom-mapper-dynamodb/README.md @@ -0,0 +1,8 @@ +## Development + +``` +npm pack ../.. +npm install ./aws-serverless-express-3.3.5.tgz +npm install --prefix ./src ./ +node local.js +``` \ No newline at end of file diff --git a/examples/custom-mapper-dynamodb/dynamodb-event.json b/examples/custom-mapper-dynamodb/dynamodb-event.json new file mode 100644 index 00000000..2181d534 --- /dev/null +++ b/examples/custom-mapper-dynamodb/dynamodb-event.json @@ -0,0 +1,28 @@ +{ + "Records": [ + { + "eventID": "93eea905b34daefbe0fe8a21858065a8", + "eventName": "INSERT", + "eventVersion": "1.1", + "eventSource": "aws:dynamodb", + "awsRegion": "us-east-1", + "dynamodb": { + "ApproximateCreationDateTime": 1560902007, + "Keys": { + "id": { + "S": "b" + } + }, + "NewImage": { + "id": { + "S": "b" + } + }, + "SequenceNumber": "200000000000235577791", + "SizeBytes": 6, + "StreamViewType": "NEW_IMAGE" + }, + "eventSourceARN": "arn:aws:dynamodb:us-east-1:123123123:table/aws-serverless-express-dynamodb-example-Table-191RH2M1OU01V/stream/2019-06-18T23:42:52.038" + } + ] +} \ No newline at end of file diff --git a/examples/custom-mapper-dynamodb/local.js b/examples/custom-mapper-dynamodb/local.js new file mode 100644 index 00000000..ce99c2d4 --- /dev/null +++ b/examples/custom-mapper-dynamodb/local.js @@ -0,0 +1,28 @@ +const lambdaFunction = require('./src/lambda.js') +const albEvent = require('./dynamodb-event.json') + +const server = lambdaFunction.handler(albEvent, {}) + .then(v => { + console.info(v) + process.exit(0) + }) + .catch(v => { + console.error(v) + process.exit(1) + }) + +process.stdin.resume() + +function exitHandler (options, err) { + if (options.cleanup && server && server.close) { + server.close() + } + + if (err) console.error(err.stack) + if (options.exit) process.exit() +} + +process.on('exit', exitHandler.bind(null, { cleanup: true })) +process.on('SIGINT', exitHandler.bind(null, { exit: true })) // ctrl+c event +process.on('SIGTSTP', exitHandler.bind(null, { exit: true })) // ctrl+v event +process.on('uncaughtException', exitHandler.bind(null, { exit: true })) diff --git a/examples/custom-mapper-dynamodb/package-lock.json b/examples/custom-mapper-dynamodb/package-lock.json new file mode 100644 index 00000000..0a0cbf14 --- /dev/null +++ b/examples/custom-mapper-dynamodb/package-lock.json @@ -0,0 +1,1182 @@ +{ + "name": "@aws-serverless-express/alb-example", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@types/babel-types": { + "version": "7.0.7", + "resolved": "https://registry.npmjs.org/@types/babel-types/-/babel-types-7.0.7.tgz", + "integrity": "sha512-dBtBbrc+qTHy1WdfHYjBwRln4+LWqASWakLHsWHR2NWHIFkv4W3O070IGoGLEBrJBvct3r0L1BUPuvURi7kYUQ==" + }, + "@types/babylon": { + 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"license": "Apache-2.0", + "dependencies": { + "aws-serverless-express": "file:aws-serverless-express-3.3.5.tgz", + "body-parser": "^1.19.0", + "cors": "^2.8.5", + "express": "^4.16.4", + "pug": "^2.0.3" + } +} diff --git a/examples/custom-mapper-dynamodb/src/app.js b/examples/custom-mapper-dynamodb/src/app.js new file mode 100644 index 00000000..a9c01044 --- /dev/null +++ b/examples/custom-mapper-dynamodb/src/app.js @@ -0,0 +1,58 @@ +const express = require('express') +const bodyParser = require('body-parser') +const app = express() +const router = express.Router() + +router.use(bodyParser.json()) +router.use(bodyParser.urlencoded({ extended: true })) + +router.get('/users', (req, res) => { + res.json(users) +}) +router.post('/users', (req, res) => { + const user = { + id: ++userIdCounter, + name: req.body.name + } + users.push(user) + res.status(201).json(user) +}) + +router.put('/users/:userId', (req, res) => { + const user = getUser(req.params.userId) + + if (!user) return res.status(404).json({}) + + user.name = req.body.name + res.json(user) +}) + +router.delete('/users/:userId', (req, res) => { + const userIndex = getUserIndex(req.params.userId) + + if (userIndex === -1) return res.status(404).json({}) + + users.splice(userIndex, 1) + res.json(users) +}) + +const getUser = (userId) => users.find(u => u.id === parseInt(userId)) +const getUserIndex = (userId) => users.findIndex(u => u.id === parseInt(userId)) + +// Ephemeral in-memory data store +const users = [{ + id: 1, + name: 'Joe' +}, { + id: 2, + name: 'Jane' +}] +let userIdCounter = users.length + +// The aws-serverless-express library creates a server and listens on a Unix +// Domain Socket for you, so you can remove the usual call to app.listen. +// app.listen(3000) +app.use('/', router) + +// Export your express server so you can import it in the lambda function. +module.exports = app diff --git a/examples/custom-mapper-dynamodb/src/dynamodb-event-mappings.js b/examples/custom-mapper-dynamodb/src/dynamodb-event-mappings.js new file mode 100644 index 00000000..13ae76b9 --- /dev/null +++ b/examples/custom-mapper-dynamodb/src/dynamodb-event-mappings.js @@ -0,0 +1,51 @@ +function getMethodBasedOnRecordEventName ({ record }) { + const { eventName } = record + switch (eventName) { + case 'INSERT': + return 'post' + case 'MODIFY': + return 'put' + case 'REMOVE': + return 'delete' + } +} + +function getPath ({ method, record }) { + switch (method) { + case 'post': + return '/users' + default: + return `/users/${record.dynamodb.NewImage.id.S}` + } +} + +function mapDynamoDbEventToHttpRequest ({ event }) { + const record = event.Records[0] + const method = getMethodBasedOnRecordEventName({ record }) + const path = getPath({ method, record }) + + return { + method, + path, + headers: {} + } +} + +function mapResponseToDynamoDb ({ + statusCode, + body, + headers, + isBase64Encoded +}) { + return { + statusCode, + body, + headers, + isBase64Encoded + } +} + +module.exports = { + mapDynamoDbEventToHttpRequest, + mapResponseToDynamoDb +} diff --git a/examples/custom-mapper-dynamodb/src/lambda.js b/examples/custom-mapper-dynamodb/src/lambda.js new file mode 100644 index 00000000..49acd9e9 --- /dev/null +++ b/examples/custom-mapper-dynamodb/src/lambda.js @@ -0,0 +1,16 @@ +const awsServerlessExpress = require('aws-serverless-express') +const app = require('./app') +const { mapDynamoDbEventToHttpRequest, mapResponseToDynamoDb } = require('./dynamodb-event-mappings') + +const ase = awsServerlessExpress.configure({ + app, + eventFns: { + request: mapDynamoDbEventToHttpRequest, + response: mapResponseToDynamoDb + }, + loggerConfig: { + level: 'debug' + } +}) + +exports.handler = ase.handler diff --git a/examples/custom-mapper-dynamodb/src/package-lock.json b/examples/custom-mapper-dynamodb/src/package-lock.json new file mode 100644 index 00000000..14420515 --- /dev/null +++ b/examples/custom-mapper-dynamodb/src/package-lock.json @@ -0,0 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lambda.handler + MemorySize: 1024 + Runtime: nodejs8.10 + Timeout: 3 + Events: + DynamoDB1: + Type: DynamoDB + Properties: + Stream: !GetAtt Table.StreamArn + StartingPosition: TRIM_HORIZON + BatchSize: 1 + Table: + Type: 'AWS::DynamoDB::Table' + Properties: + AttributeDefinitions: + - AttributeName: id + AttributeType: S + KeySchema: + - AttributeName: id + KeyType: HASH + ProvisionedThroughput: + ReadCapacityUnits: 5 + WriteCapacityUnits: 5 + StreamSpecification: + StreamViewType: NEW_IMAGE + +Outputs: + LambdaFunctionConsoleUrl: + Description: Console URL for the Lambda Function. + Value: !Sub https://${AWS::Region}.console.aws.amazon.com/lambda/home?region=${AWS::Region}#/functions/${ServerlessExpressFunction} diff --git a/src/event-mappings/alb.js b/src/event-mappings/alb.js index 0aaac562..401d1ae9 100644 --- a/src/event-mappings/alb.js +++ b/src/event-mappings/alb.js @@ -1,6 +1,6 @@ const { mapEventToHttpRequest, mapResponseToService } = require('./utils') -const mapAlbEventToHttpRequest = ({ event, socketPath }) => mapEventToHttpRequest({ event, socketPath }) +const mapAlbEventToHttpRequest = ({ event }) => mapEventToHttpRequest({ event }) const mapResponseToAlb = ({ statusCode, body, diff --git a/src/event-mappings/api-gateway.js b/src/event-mappings/api-gateway.js index 043d1276..6c2fad4d 100644 --- a/src/event-mappings/api-gateway.js +++ b/src/event-mappings/api-gateway.js @@ -1,6 +1,6 @@ const { mapEventToHttpRequest, mapResponseToService } = require('./utils') -const mapApiGatewayEventToHttpRequest = ({ event, socketPath }) => mapEventToHttpRequest({ event, socketPath }) +const mapApiGatewayEventToHttpRequest = ({ event }) => mapEventToHttpRequest({ event }) function mapResponseToApiGateway ({ statusCode, diff --git a/src/event-mappings/lambda-edge.js b/src/event-mappings/lambda-edge.js index 77f177aa..0379e7c1 100644 --- a/src/event-mappings/lambda-edge.js +++ b/src/event-mappings/lambda-edge.js @@ -1,6 +1,6 @@ const { mapEventToHttpRequest, mapResponseToService } = require('./utils') -const mapLambdaEdgeEventToHttpRequest = ({ event, socketPath }) => mapEventToHttpRequest({ event, socketPath }) +const mapLambdaEdgeEventToHttpRequest = ({ event }) => mapEventToHttpRequest({ event }) const mapResponseToLambdaEdge = ({ statusCode, body, diff --git a/src/event-mappings/utils.js b/src/event-mappings/utils.js index db94148e..bcaa0a7a 100644 --- a/src/event-mappings/utils.js +++ b/src/event-mappings/utils.js @@ -1,10 +1,17 @@ -const { getPathWithQueryStringParams, getEventBody } = require('../utils') +const { getPathWithQueryStringParams } = require('../utils') + +function getEventBody ({ + event, + body = event.body, + isBase64Encoded = event.isBase64Encoded +}) { + return Buffer.from(body, isBase64Encoded ? 'base64' : 'utf8') +} function mapEventToHttpRequest ({ event, method = event.httpMethod, path = getPathWithQueryStringParams({ event }), - socketPath, headers }) { if (!headers) { @@ -14,8 +21,10 @@ function mapEventToHttpRequest ({ }) } + let body + if (event.body) { - const body = getEventBody({ event }) + body = getEventBody({ event }) const isBase64Encoded = event.isBase64Encoded headers['Content-Length'] = Buffer.byteLength(body, isBase64Encoded ? 'base64' : 'utf8') } @@ -24,7 +33,7 @@ function mapEventToHttpRequest ({ method, path, headers, - socketPath + body // protocol: `${headers['X-Forwarded-Proto']}:`, // host: headers.Host, // hostname: headers.Host, // Alias for host diff --git a/src/transport.js b/src/transport.js index 417647e0..a61dc77a 100644 --- a/src/transport.js +++ b/src/transport.js @@ -4,8 +4,7 @@ const { } = require('./event-mappings') const { getContentType, - isContentTypeBinaryMimeType, - getEventBody + isContentTypeBinaryMimeType } = require('./utils') function forwardResponse ({ @@ -98,12 +97,10 @@ function forwardRequestToNodeServer ({ logger.debug('Forwarding request to application...') const eventResponseMapperFn = eventFns.response try { - const requestOptions = eventFns.request({ - event, - socketPath: getSocketPath({ socketPathSuffix: server._socketPathSuffix }) - }) + const socketPath = getSocketPath({ socketPathSuffix: server._socketPathSuffix }) + const { body, ...requestOptions } = eventFns.request({ event }) logger.debug('requestOptions', requestOptions) - const req = http.request(requestOptions, (response) => forwardResponse({ + const req = http.request({ socketPath, ...requestOptions }, (response) => forwardResponse({ server, response, resolver, @@ -111,8 +108,7 @@ function forwardRequestToNodeServer ({ logger })) - if (event.body) { - const body = getEventBody({ event }) + if (body) { logger.debug('body', body) req.write(body) } @@ -164,7 +160,7 @@ function makeResolver ({ return { succeed: ({ response }) => { - if (resolutionMode === 'CONTEXT_SUCCEED') return context.succeed(response) + if (resolutionMode === 'CONTEXT') return context.succeed(response) if (resolutionMode === 'CALLBACK') return callback(null, response) if (resolutionMode === 'PROMISE') return promise.resolve(response) } diff --git a/src/utils.js b/src/utils.js index 3ea1cdff..fa04ccdb 100644 --- a/src/utils.js +++ b/src/utils.js @@ -2,14 +2,6 @@ const url = require('url') const isType = require('type-is') -function getEventBody ({ - event, - body = event.body, - isBase64Encoded = event.isBase64Encoded -}) { - return Buffer.from(body, isBase64Encoded ? 'base64' : 'utf8') -} - function getContentType ({ contentTypeHeader }) { // only compare mime type; ignore encoding part return contentTypeHeader ? contentTypeHeader.split(';')[0] : '' @@ -40,7 +32,6 @@ function getRandomString () { module.exports = { getPathWithQueryStringParams, - getEventBody, isContentTypeBinaryMimeType, getContentType, getRandomString