NodeJS Lambda

A javascript node library to report lambda timing using IOT Agent

Warning

Use at your own risk. This code was developed to give nodejs lambda insights before the official NodeJS Lambda Agent was released. Official nodejs lambda support for AppDynamics is available. This wrapper should no longer be used as the official agent now exists. See https://docs.appdynamics.com/display/PRO45/Node.js+Serverless+Tracer for more details.

This uses the AppDynamics IOT api to send timing data for lambda. This requires iot licenses to report the data.

Prerequisites

An AppDynamics Controller.
An AppDynamics IOT API Key.
NPM

Usage

A step by step to quick get up and running

1. add appdynamics lib to your lambda

npm install git+https://github.com/Appdynamics/IOT-Node-Wrapper-for-Lambda.git

2. Import AppAgent.ts Transaction at top of each handler function

import { AppAgent } from '@appdynamicsnodelambda/nodelambda/appdynamics/AppAgent'

3. Initialize the AppAgent at end of your handler by passing in the handler function

import { AppAgent } from '@appdynamicsnodelambda/nodelambda/appdynamics/AppAgent'

var myhandler =  (event: any, context: any, callback: any) => {
    callback(null, 'success');
}
myhandler = AppAgent.init(myhandler, {
    lambdaHeaders: {
        "headertolookfor":DataType.STRING
    }
});
export { myhandler }

4. Add the following enivronment/stage variable in lambda

APPDYNAMICS_ENABLED

set value to "true" to enable the agent or "false" to disable the agent

5. Add the following enivronment/stage variable in lambda

APPDYNAMICS_APPKEY

set value to the appKey for your installation

*Note these can be set at environement or stageVariable level. The environment Variable takes precedence.

App Config

export interface AppConfig {
    /*App Key to IOT Application in AppDynamics*/
    appKey?: string;
    /*Optional key that will look at the event.headers for a uniqueid.  If none given, datetime.now() is used as a uniquekey */
    uniqueIDHeader?: string;
    /*String of which log level reporting to be done*/
    loglevel?: string;
    /*Map of header key to data type to look for in event.headers*/
    lambdaHeaders?:DataTypeMap;
    /*Map of header key to data type to look for in request.headers*/
    requestHeaders?:DataTypeMap;
    /*Map of header key to data type to look for in resp.headers*/
    responseHeaders?:DataTypeMap;
    /*Map of property to data type to look for in event*/
    eventData?:DataTypeMap;
    /*Map of parameter to data type to look for in aws services*/
    AWSData?:DataTypeMap;
}

Valid DataTypes should match this typing:

export enum DataType {
    STRING = "string",
    DATETIME = "datetime",
    BOOLEAN = "boolean",
    DOUBLE = "double"

}

Example:

import { AppAgent } from '@appdynamicsnodelambda/nodelambda/appdynamics/AppAgent'
import { DataType } from '@appdynamicsnodelambda/nodelambda/appdynamics/index';

var handler =  (event: any, context: any, callback: any) => {
    callback(null, 'success');
}
handler = AppAgent.init(handler, {
    eventData: {
        'EventDataPropert':DataType.STRING
    },    
    lambdaHeaders: {
        'sessionID':DataType.DOUBLE,
        'DateTimeKey': DataType.DATETIME,
        'TestBool': DataType.BOOLEAN
    },
    responseHeaders: {
        'sessionid':DataType.STRING
    }

});

export { handler }

Custom data

Custom Properties can be sent at a transactional level. The function takes an object that contains dictionaries for each of the different data types.

Signature:

stringProperties?: StringMap;
booleanProperties?: BooleanMap;
doubleProperties?: NumberMap;
datetimeProperties?: NumberMap;

stringProperties: object A map of the string properties of this event. There cannot be more than 16 string properties per event. Entry keys have a max length of 24 characters. Entry values have a max length of 128 characters. Entry keys cannot contain the pipe character '|'. Valid Examples: { "username": "john.doe" }

booleanProperties: object A map of the boolean properties of this event. There cannot be more than 16 boolean properties per event. Entry keys have a max length of 24 characters. Entry keys cannot contain the pipe character '|'. Valid Examples: { "error": false }

doubleProperties: object A map of the double properties of this event. There cannot be more than 16 double properties per event. Entry keys have a max length of 24 characters. Entry keys cannot contain the pipe character '|'. Valid Examples: { "Fahrenheit": 98.2 }

datetimeProperties: object A map of the datetime properties of this event, in millisecond epoch time. There cannot be more than 16 datetime properties per event. Entry keys have a max length of 24 characters. Entry keys cannot contain the pipe character '|'. Valid Examples: { "bootTime": 1487119625012 }

Example usage:

import { AppAgent } from '@appdynamicsnodelambda/nodelambda/appdynamics/AppAgent'


var handler =  (event: any, context: any, callback: any) => {
    if(global.txn){
        global.txn.customData({
            stringProperties: { 'MyProperty': 'MyStringValue'}
        });
    }
    callback(null, 'success');
}
handler = AppAgent.init(handler);
export { handler }

Exit Calls

By default, the agent will pick up any requests that utilize the http module or aws-sdk events. For exit points not picked up by default, custom code can be used like so to add an exit point to your transaction

  if(global.txn) {
        myexitcall = global.txn.createHTTPExitCall({
            url: 'urlofexitcall.com'
        }) as ExitCall;
    }

    mylibrary.getresults((data)=> {
        if(myexitcall) {
            myexitcall.stop();
        }
    });

Logging

APPDYNAMICS_LOGLEVEL can be added at the environment or stage level to enable logging

Authors

• Michael Sickles - Initial work - [email protected]