Christopher Anderson christopheranderson

How to debug Node Azure Functions locally

This is a guide on how to set up the Azure Functions CLI to debug functions locally.

🚧 WARNING - This is very experimental and not yet very easy. I'm writing up this guide for the brave few. WARNING 🚧

🐲 Beyond here be dragons. 🐲

Requirements

How to use Functions in Visual Studio

This is super hacky, but just wanted to leave the notes somewhere reusable that isn't official documentation. This isn't "recommended", but it is possible. :)

Create your Functions via the Azure Functions portal UX is the easiest way. Otherwise, just follow the file format rules on the Azure Functions located here.
Download them via your scm site - {function app name}.scm.azurewebsites.net -> DebugConsole -> cd ./site -> click on the "download" button for wwwroot
Open Visual Studio, create a new Website, choose your unzipped wwwroot folder.
Now you should see all your Functions in a directory in your Visual Studio. You can edit them here. etc.
To Publish - Just right-click->publish on the project, choose an existing Web App (even though it's a function app, it speaks Web App apis, so it shows up here). Then publish with your changes. If might fail, just click on the "

	requests
	\| where timestamp > ago(30m)
	\| summarize percentiles(duration, 50, 95, 99) by bin(timestamp, 1m)
	\| render timechart

	{
	"$schema": "http://schemas.management.azure.com/schemas/2015-01-01-preview/deploymentTemplate.json#",
	"contentVersion": "1.0.0.0",
	"parameters": {
	"appName": {
	"type": "string",
	"metadata": {
	"description": "The name of the function app that you wish to create."
	}
	},

	<?xml version="1.0" encoding="utf-8"?>
	<key name="Software">
	<key name="ConEmu">
	<key name=".Vanilla" modified="2017-01-25 22:48:35" build="161206">
	<value name="StartType" type="hex" data="02"/>
	<value name="CmdLine" type="string" data=""/>
	<value name="StartTasksFile" type="string" data=""/>
	<value name="StartTasksName" type="string" data="{Shells::PowerShell}"/>
	<value name="StartFarFolders" type="hex" data="00"/>
	<value name="StartFarEditors" type="hex" data="00"/>

	var request = require('request');
	var uuid = require('node-uuid');

	/* Requires a Cognitive Services Text Analytics */
	/* Be sure to install the request and node-uuid packages and add the "COG_URL" and "COG_KEY" App Settings before running */

	module.exports = function(context, req) {
	context.log('Node.js HTTP trigger function processed a request. RequestUri=%s', req.originalUrl);

	// Make a call out to Cognitive Services


	using System.Net;
	using Microsoft.Bot.Connector;

	public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
	{
	log.Verbose($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");

	var msg = await req.Content.ReadAsAsync<Message>();

	module.exports = function(context, req) {
	var method = req.method.toLowerCase();
	context.log(JSON.stringify(req, null, " "));
	if(methods[method]){
	methods[method](context, req);
	} else {
	context.res = {
	status: 404,
	body: "No route found for VERB: " + req.method
	}

	{
	"frameworks": {
	"net46":{
	"dependencies": {
	"ChatWork.Api": "0.4.0"
	}
	}
	}
	}

	<!--
	To change this template, choose Tools \| Templates
	and open the template in the editor.
	-->
	<!DOCTYPE html>
	<html>
	<head>
	<title></title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	</head>