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context.ts
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context.ts
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'use strict';
/*
* Lambda's Context object.
* Refer to this documentation:
* https://docs.aws.amazon.com/en_us/lambda/latest/dg/nodejs-prog-model-context.html
*/
import utils = require('./utils.js');
import mute = require('./mute.js');
import { StreamingBody } from './streaming.js';
function Context() {
this.logger = null;
this.unmute = null;
this.verboseLevel = null;
this.finalCallback = null;
/*
* doneStatus & postDone were minimum; probably defined internally in Lambda.
*/
this.doneStatus = false;
this.postDone = function(error, message) {};
/*
* Used to determine the getRemainingTimeInMillis()
*/
this.startTime;
this.timeout;
/* Internal usage: timer handle */
this._timeout;
/*
* Context object properties
*/
this.callbackWaitsForEmptyEventLoop = false; // Unlike AWS, we default it to false because our implementation is a bit ugly
this.functionName = '';
this.functionVersion = process.env.AWS_LAMBDA_FUNCTION_VERSION;
this.invokedFunctionArn = null;
this.memoryLimitInMB = process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE;
this.awsRequestId = null;
this.logGroupName = 'Group name';
this.logStreamName = 'Stream name';
this.identity = null;
this.clientContext = null;
this.onInvocationEnd = null;
/*
* callback function called after done
*/
this.callback = function(result) {
return result;
};
}
/*
* create random invokeid.
* Assuming that invokeid follows the format:
* 8hex-4hex-4hex-4hex-12hex
*/
const createInvokeId = function() {
return [
utils.generateRandomHex(8),
utils.generateRandomHex(4),
utils.generateRandomHex(4),
utils.generateRandomHex(4),
utils.generateRandomHex(12)
].join('-');
}
/*
* create invoked function in the proper format
*/
Context.prototype.createInvokeFunctionArn = function() {
return [
'arn',
'aws',
'lambda',
process.env.AWS_REGION,
process.env.AWS_ACCOUNT_ID || Math.round(Math.random() * 1000000000000).toString(),
'function',
this.functionName,
this.functionVersion
].join(':');
}
/*
* Context initialization.
* Called from lambdalocal.js
*/
Context.prototype._initialize = function(options) {
/* set time */
this.startTime = new Date().getTime();
this.timeout = options.timeoutMs;
this.logger = options.logger;
this.verboseLevel = options.verboseLevel;
this.finalCallback = options.finalCallback;
/* set function name */
this.functionName = options.functionName;
/* set requestid */
this.awsRequestId = createInvokeId();
/* set invokedFunctionArn */
this.invokedFunctionArn = this.createInvokeFunctionArn();
/* Set callbackWaitsForEmptyEventLoop */
this.callbackWaitsForEmptyEventLoop = options.callbackWaitsForEmptyEventLoop;
if (this.verboseLevel > 1){
this.logger.log('info', 'START RequestId: ' + this.awsRequestId);
}
if (this.verboseLevel < 3 && this.verboseLevel >= 0){
this.unmute = mute();
}
this.clientContext = options.clientContext;
this.onInvocationEnd = options.onInvocationEnd;
return;
};
/*
* Timeout initialization.
* Called from lambdalocal.js
*/
Context.prototype._init_timeout = function(){
/* Handling timeout */
this._timeout = setTimeout((function() {
this.fail(new utils.TimeoutError('Task timed out after ' + (this.timeout / 1000).toFixed(2) + ' seconds'));
}).bind(this), this.timeout);
}
/*
* Util function used in lambdalocal.js to get parameters for the handler
*/
Context.prototype.generate_context = function(){
//https://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-context.html
var ctx = {
//FUNCTIONS
done: this.done.bind(this),
fail: this.fail.bind(this),
succeed: this.succeed.bind(this),
getRemainingTimeInMillis: this.getRemainingTimeInMillis.bind(this),
//VARS
callbackWaitsForEmptyEventLoop: this.callbackWaitsForEmptyEventLoop,
functionName: this.functionName,
functionVersion: this.functionVersion,
invokedFunctionArn: this.invokedFunctionArn,
memoryLimitInMB: this.memoryLimitInMB,
awsRequestId: this.awsRequestId,
logGroupName: this.logGroupName,
logStreamName: this.logStreamName,
identity: this.identity,
clientContext: this.clientContext,
_stopped: false,
// INTERNAL
__lambdaLocal: {
onInvocationEnd: this.onInvocationEnd
},
};
return ctx;
}
/*
* This `done` method is directly extracted from source.
*/
Context.prototype.done = function(err, message) {
// May only be called once
if (this._stopped) {
return;
}
this._stopped = true;
clearTimeout(this._timeout);
if(this.unmute != null) {
this.unmute();
this.unmute = null;
}
if(err instanceof Error){
//http://docs.aws.amazon.com/en_en/lambda/latest/dg/nodejs-prog-mode-exceptions.html
var _stack;
if (err.stack){
// Trim stack
_stack = err.stack.split("\n");
_stack.shift();
for (var i =0; i < _stack.length; i++){_stack[i] = _stack[i].trim().substr(3);}
err = {
"errorMessage": err.message,
"errorType": err.name,
"stackTrace": _stack
};
} else {
err = {
"errorMessage": err.message,
"errorType": err.name
};
}
}
if (err !== null && typeof err !== 'undefined') {
if (this.verboseLevel > 1){
this.logger.log('error', 'End - Error:');
}
if (this.verboseLevel > 0){
this.logger.log('error', utils.processJSON(err));
}
} else {
if (this.verboseLevel > 1){
this.logger.log('info', 'End - Result:');
}
if (this.verboseLevel > 0){
this.logger.log('info', utils.processJSON(message));
}
}
this.finalCallback(); //Destroy env...
const isStream = typeof message === "object" && message?.body instanceof StreamingBody
if (!isStream) {
this.onInvocationEnd?.();
}
/*
The finalCallback method will be instantly called if 'this.callbackWaitsForEmptyEventLoop' is False
Otherwise, lambda-local will wait for an empty loop then call it.
*/
if (this.callbackWaitsForEmptyEventLoop){
var that = this;
utils.waitForNodeJS(function(){
that.callback(err, message);
});
} else {
this.callback(err, message);
}
}
/*
* `fail` method calls the `done` method
*/
Context.prototype.fail = function(err) {
this.done(err);
};
/*
* `succeed` method calls the `done` method
*/
Context.prototype.succeed = function(message) {
this.done(null, message);
};
/*
* 'getRemainingTimeInMillis' method return time before task is killed
*/
Context.prototype.getRemainingTimeInMillis = function() {
var now = new Date().getTime();
return (this.timeout + this.startTime - now);
};
/*
* exports
*/
export = Context;