Connect Google Container Builder to Github with Google Cloud Functions

index.js

// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// npm install github
var GitHubApiModule = require('github');
var githubapi = new GitHubApiModule();

// user token
githubapi.authenticate({
	type: 'token',
	// use a user token, or auth of your choice
	token: '<your user token>'
});

/**
 * Responds to Github Webhook
 * Connect this function to the Github Webhook
 * gcloud beta functions deploy github --trigger-http
 *
 * @param {Object} req Cloud Function request context.
 * @param {Object} res Cloud Function response context.
 */
exports.github = function github(req, res) {
	if (req.get('X-GitHub-Event') == "push") {
		console.log("Github push request recieved");

		var msg = req.body.head_commit.message;
		if (msg.includes("[skip ci]") || msg.includes("[ci skip]")) {
			console.log("Skipping CI");
			res.status(200).end();
			return;
		}

		var args = {
			owner: req.body.repository.owner.login,
			repo: req.body.repository.name,
			sha: req.body.head_commit.id,
			state: "pending",
			context: "build-bot",
			description: "Starting build process...",
		};
		console.log("Setting commit status:", args);

		githubapi.repos.createStatus(args)
			.then(() => res.status(200).end())
			.catch(err => {
				console.log("error setting status:", err);
				res.status(504).end();
			});
	} else {
		res.status(400).end();
	}
};

/**
 * Called on Google Cloud Container Builder builds
 * Connect this to the Google Container Builder pubsub topic
 * gcloud beta functions deploy builder --trigger-topic cloud-builds
 *
 * @param {object} event The Cloud Functions event.
 */
exports.builder = function builder(event) {
	// since we don't know the originating repo (as we sync to cloud source repo)
	// specify it here
	var owner = "<your repo>";
	
	var status = event.data.attributes.status;
	var buildId = event.data.attributes.buildId;
	var dataJSON = Buffer.from(event.data.data, 'base64').toString();
	var data = JSON.parse(dataJSON);
	
	console.log("received event: status:", status);
	console.log("received event: data:", data);
	
	var args = {
		owner: owner,
		repo: data.sourceProvenance.resolvedRepoSource.repoName, // we assume the repo names match
		sha: data.sourceProvenance.resolvedRepoSource.commitSha,
		context: "build-bot",
		target_url: data.logUrl,
	};
	
	switch (status) {
		case "QUEUED":
			args.state = "pending";
			args.description = "Build " + buildId + " is queued";
		break;
		case "WORKING":
			args.state = "pending";
			args.description = "Build " + buildId + " is working";
		break;
		case "SUCCESS":
			args.state = "success";
			args.description = "Build " + buildId + " succeeded";
		break;
		case "FAILURE":
			args.state = "failure";
			args.description = "Build " + buildId + " failed";
		break;
		// anything else means it failed somehow
		default:
			args.state = "error";
			args.description = "Build " + buildId + " errored with a status of: " + status;
		break;
	}

	console.log("Sending github status: ", args);
	return githubapi.repos.createStatus(args);	
};

Hey Mark,

Why is the first function even necessary (the github one)?
When the build is started ("QUEUED"), it will send a status anyway.

Cheers,
Mod

@Philmod - basically I was concerned that if the container builder step didn't even start, then a PR could still be pushed through.

It's more of a "just in case".