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awslambda-mock.js
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232 lines (206 loc) · 7.8 KB
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var fs = require('fs')
var crypto = require('crypto')
var http = require('http')
var child_process = require('child_process')
var PING_RETRIES = 20
var LOGS = ''
var LOG_TAIL = false
var HAS_BUFFER_FROM = Buffer.from && Buffer.from !== Uint8Array.from
var STAY_OPEN = process.env.DOCKER_LAMBDA_STAY_OPEN
var HANDLER = process.argv[2] || process.env.AWS_LAMBDA_FUNCTION_HANDLER || process.env._HANDLER || 'index.handler'
var EVENT_BODY = process.argv[3] || process.env.AWS_LAMBDA_EVENT_BODY ||
(process.env.DOCKER_LAMBDA_USE_STDIN && fs.readFileSync('/dev/stdin', 'utf8')) || '{}'
var FN_NAME = process.env.AWS_LAMBDA_FUNCTION_NAME || 'test'
var VERSION = process.env.AWS_LAMBDA_FUNCTION_VERSION || '$LATEST'
var MEM_SIZE = process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE || '1536'
var TIMEOUT = process.env.AWS_LAMBDA_FUNCTION_TIMEOUT || '300'
var REGION = process.env.AWS_REGION || process.env.AWS_DEFAULT_REGION || 'us-east-1'
var ACCOUNT_ID = process.env.AWS_ACCOUNT_ID || randomAccountId()
var ACCESS_KEY_ID = process.env.AWS_ACCESS_KEY_ID || 'SOME_ACCESS_KEY_ID'
var SECRET_ACCESS_KEY = process.env.AWS_SECRET_ACCESS_KEY || 'SOME_SECRET_ACCESS_KEY'
var SESSION_TOKEN = process.env.AWS_SESSION_TOKEN
var INVOKED_ARN = process.env.AWS_LAMBDA_FUNCTION_INVOKED_ARN || arn(REGION, ACCOUNT_ID, FN_NAME)
var TRACE_ID = process.env._X_AMZN_TRACE_ID || 'root=1-5d9639c7-ac2df104a29f3070f507bdb4;sampled=0'
var CLIENT_CONTEXT = process.env.AWS_LAMBDA_CLIENT_CONTEXT
var COGNITO_IDENTITY = process.env.AWS_LAMBDA_COGNITO_IDENTITY
var COGNITO_IDENTITY_ID = (tryParse(COGNITO_IDENTITY) || {}).identity_id
var COGNITO_IDENTITY_POOL_ID = (tryParse(COGNITO_IDENTITY) || {}).identity_pool_id
var DEADLINE_MS = Date.now() + (TIMEOUT * 1000)
process.on('SIGINT', () => process.exit(0))
// Don't think this can be done in the Docker image
process.umask(2)
process.env.AWS_LAMBDA_FUNCTION_NAME = FN_NAME
process.env.AWS_LAMBDA_FUNCTION_VERSION = VERSION
process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE = MEM_SIZE
process.env.AWS_LAMBDA_LOG_GROUP_NAME = '/aws/lambda/' + FN_NAME
process.env.AWS_LAMBDA_LOG_STREAM_NAME = new Date().toISOString().slice(0, 10).replace(/-/g, '/') +
'/[' + VERSION + ']' + crypto.randomBytes(16).toString('hex')
process.env.AWS_REGION = REGION
process.env.AWS_DEFAULT_REGION = REGION
process.env._HANDLER = HANDLER
var mockServerProcess = child_process.spawn('/var/runtime/mockserver', {
stdio: ['pipe', 'inherit', 'inherit'],
env: Object.assign({
DOCKER_LAMBDA_NO_BOOTSTRAP: 1,
DOCKER_LAMBDA_USE_STDIN: 1,
}, process.env)
})
mockServerProcess.on('error', console.error)
mockServerProcess.stdin.end(EVENT_BODY)
mockServerProcess.unref()
var OPTIONS = {
invokeId: uuid(),
handler: HANDLER,
suppressInit: true,
credentials: {
key: ACCESS_KEY_ID,
secret: SECRET_ACCESS_KEY,
session: SESSION_TOKEN,
},
eventBody: EVENT_BODY,
contextObjects: {
clientContext: CLIENT_CONTEXT,
cognitoIdentityId: COGNITO_IDENTITY_ID,
cognitoPoolId: COGNITO_IDENTITY_POOL_ID,
},
invokedFunctionArn: INVOKED_ARN,
'x-amzn-trace-id': TRACE_ID
}
// Some weird spelling error in the source?
OPTIONS.invokeid = OPTIONS.invokeId
var invoked = false
var errored = false
var pingPromise = new Promise(resolve => ping(PING_RETRIES, resolve))
var reportDonePromise = new Promise(resolve => resolve())
module.exports = {
initRuntime: function () { return OPTIONS },
waitForInvoke: function (cb) {
Promise.all([pingPromise, reportDonePromise]).then(() => {
http.get({
hostname: '127.0.0.1',
port: 9001,
path: '/2018-06-01/runtime/invocation/next',
}, res => {
if (res.statusCode !== 200) {
console.error(`Mock server invocation/next returned a ${res.statusCode} response`)
return process.exit(1)
}
if (invoked) {
LOGS = ''
}
invoked = true
OPTIONS.invokeId = OPTIONS.initInvokeId = OPTIONS.invokeid = res.headers['lambda-runtime-aws-request-id']
OPTIONS.invokedFunctionArn = res.headers['lambda-runtime-invoked-function-arn']
OPTIONS['x-amzn-trace-id'] = res.headers['lambda-runtime-trace-id']
DEADLINE_MS = +res.headers['lambda-runtime-deadline-ms']
OPTIONS.contextObjects.clientContext = res.headers['lambda-runtime-client-context']
var cognitoIdentity = tryParse(res.headers['lambda-runtime-cognito-identity']) || {}
OPTIONS.contextObjects.cognitoIdentityId = cognitoIdentity.identity_id
OPTIONS.contextObjects.cognitoPoolId = cognitoIdentity.identity_pool_id
LOG_TAIL = res.headers['docker-lambda-log-type'] === 'Tail'
OPTIONS.eventBody = ''
res.setEncoding('utf8')
.on('data', data => OPTIONS.eventBody += data)
.on('end', () => cb(OPTIONS))
.on('error', function (err) {
console.error(err)
process.exit(1)
})
}).on('error', err => {
if (err.code === 'ECONNRESET') {
return process.exit(errored ? 1 : 0)
}
console.error(err)
process.exit(1)
})
})
},
reportRunning: function (invokeId) { }, // eslint-disable-line no-unused-vars
reportDone: function (invokeId, errType, resultStr) {
if (!invoked) return
if (errType) errored = true
reportDonePromise = new Promise(resolve => {
http.request({
method: 'POST',
hostname: '127.0.0.1',
port: 9001,
path: '/2018-06-01/runtime/invocation/' + invokeId + (errType == null ? '/response' : '/error'),
headers: LOG_TAIL ? { 'Docker-Lambda-Log-Result': newBuffer(LOGS).slice(-4096).toString('base64') } : {},
}, res => {
if (res.statusCode !== 202) {
console.error(err || 'Got status code: ' + res.statusCode)
process.exit(1)
}
resolve()
}).on('error', err => {
console.error(err)
process.exit(1)
}).end(resultStr)
})
},
reportFault: function (invokeId, msg, errName, errStack) {
errored = true
systemErr(msg + (errName ? ': ' + errName : ''))
if (errStack) systemErr(errStack)
},
reportUserInitStart: function () { },
reportUserInitEnd: function () { },
reportUserInvokeStart: function () { },
reportUserInvokeEnd: function () { },
reportException: function () { },
getRemainingTime: function () { return DEADLINE_MS - Date.now() },
sendConsoleLogs: consoleLog,
maxLoggerErrorSize: 256 * 1024,
}
function ping(retries, cb) {
http.get({ hostname: '127.0.0.1', port: 9001, path: '/2018-06-01/runtime/ping' }, cb).on('error', () => {
if (!retries) {
console.error('Mock server did not respond to pings in time')
process.exit(1)
}
setTimeout(ping, 5, retries - 1, cb)
})
}
function tryParse(cognitoIdentity) {
try {
return JSON.parse(cognitoIdentity)
} catch (e) {
return null
}
}
function consoleLog(str) {
if (STAY_OPEN) {
if (LOG_TAIL) {
LOGS += str
}
process.stdout.write(str)
} else {
process.stderr.write(formatConsole(str))
}
}
function systemErr(str) {
process.stderr.write(formatErr(str) + '\n')
}
function formatConsole(str) {
return str.replace(/^[0-9TZ:.-]+\t[0-9a-f-]+\t/, '\u001b[34m$&\u001b[0m')
}
function formatErr(str) {
return '\u001b[31m' + str + '\u001b[0m'
}
// Approximates the look of a v1 UUID
function uuid() {
return crypto.randomBytes(4).toString('hex') + '-' +
crypto.randomBytes(2).toString('hex') + '-' +
crypto.randomBytes(2).toString('hex').replace(/^./, '1') + '-' +
crypto.randomBytes(2).toString('hex') + '-' +
crypto.randomBytes(6).toString('hex')
}
function randomAccountId() {
return String(0x100000000 * Math.random())
}
function arn(region, accountId, fnName) {
return 'arn:aws:lambda:' + region + ':' + accountId.replace(/[^\d]/g, '') + ':function:' + fnName
}
function newBuffer(str) {
return HAS_BUFFER_FROM ? Buffer.from(str) : new Buffer(str)
}