Proxy Jenkins build status to GitHub (#35)

This enables Jenkins jobs to push updates as POST requests to the bot,
which proxies the information given to the GitHub status API, resulting in
PRs getting inline build status like we're used to with Travis CI.

lib/push-jenkins-update.js

@@ -0,0 +1,46 @@
+'use strict'
+
+const githubClient = require('./github-client')
+
+function pushJenkinsUpdate (options, build) {
+  const statusOpts = extendWithBuildData(options, build)
+  const createGhStatus = createGhStatusFn(statusOpts)
+
+  createGhStatus(build.status, build.message)
+}
+
+function createGhStatusFn (options) {
+  const prInfo = prInfoStr(options)
+
+  return (state, message) => {
+    githubClient.statuses.create({
+      user: options.owner,
+      repo: options.repoName,
+      sha: options.sha,
+      target_url: options.url,
+      context: options.context,
+      state: state,
+      description: message
+    }, (err, res) => {
+      if (err) {
+        return console.error(`! ${prInfo} Error while updating Jenkins / GitHub PR status`, err)
+      }
+      console.log(`* ${prInfo} Jenkins / Github PR status updated to '${state}'`)
+    })
+  }
+}
+
+function extendWithBuildData (options, build) {
+  return Object.assign({
+    sha: build.commit,
+    url: build.url,
+    context: build.identifier
+  }, options)
+}
+
+function prInfoStr (options) {
+  const shortSha = options.sha.substr(0, 7)
+  return `${options.owner}/${options.repoName}/${shortSha}`
+}
+
+module.exports = pushJenkinsUpdate

package.json

@@ -23,9 +23,11 @@
   },
   "devDependencies": {
     "eventsource": "^0.2.1",
+    "nock": "^8.0.0",
     "nodemon": "^1.9.1",
     "request": "^2.72.0",
     "standard": "^6.0.7",
+    "supertest": "^1.2.0",
     "tap": "^5.7.1"
   }
 }

scripts/node-jenkins-status.js

@@ -0,0 +1,14 @@
+'use strict'
+
+const pushJenkinsUpdate = require('../lib/push-jenkins-update')
+
+module.exports = function (app) {
+  app.post('/node/jenkins', (req, res) => {
+    pushJenkinsUpdate({
+      owner: 'nodejs',
+      repoName: 'node'
+    }, req.body)
+
+    res.status(201).end()
+  })
+}

test/_fixtures/error-payload.json

@@ -0,0 +1,7 @@
+{
+    "identifier": "test/arm",
+    "status": "failure",
+    "message": "tests failed",
+    "commit": "8a5fec2a6bade91e544a30314d7cf21f8a200de1",
+    "url": "https://ci.nodejs.org/job/node-test-commit-arm/3087/"
+}

test/_fixtures/pending-payload.json

@@ -0,0 +1,7 @@
+{
+    "identifier": "test/linux",
+    "status": "pending",
+    "message": "checking for errors",
+    "commit": "8a5fec2a6bade91e544a30314d7cf21f8a200de1",
+    "url": "https://ci.nodejs.org/job/node-test-commit-linux/3176/"
+}

test/_fixtures/success-payload.json

@@ -0,0 +1,7 @@
+{
+    "identifier": "test/osx",
+    "status": "success",
+    "message": "tests passed",
+    "commit": "8a5fec2a6bade91e544a30314d7cf21f8a200de1",
+    "url": "https://ci.nodejs.org/job/node-test-commit-osx/3157/"
+}

test/push-jenkins-update.test.js

@@ -0,0 +1,62 @@
+'use strict'
+
+const tap = require('tap')
+const fs = require('fs')
+const path = require('path')
+const url = require('url')
+const nock = require('nock')
+const supertest = require('supertest')
+
+const app = require('../app')
+
+tap.test('Sends POST requests to https://api.github.com/repos/nodejs/node/statuses/<SHA>', (t) => {
+  const fixture = readFixture('success-payload.json')
+  const scope = nock('https://api.github.com')
+                  .filteringPath(ignoreQueryParams)
+                  .post('/repos/nodejs/node/statuses/8a5fec2a6bade91e544a30314d7cf21f8a200de1')
+                  .reply(201)
+
+  t.plan(1)
+  t.tearDown(() => scope.done())
+
+  supertest(app)
+    .post('/node/jenkins')
+    .send(fixture)
+    .expect(201)
+    .end((err, res) => {
+      t.equal(err, null)
+    })
+})
+
+tap.test('Forwards payload provided in incoming POST to GitHub status API', (t) => {
+  const fixture = readFixture('success-payload.json')
+  const scope = nock('https://api.github.com')
+                  .filteringPath(ignoreQueryParams)
+                  .post('/repos/nodejs/node/statuses/8a5fec2a6bade91e544a30314d7cf21f8a200de1', {
+                    state: 'success',
+                    context: 'test/osx',
+                    description: 'tests passed',
+                    target_url: 'https://ci.nodejs.org/job/node-test-commit-osx/3157/'
+                  })
+                  .reply(201)
+
+  t.plan(1)
+  t.tearDown(() => scope.done())
+
+  supertest(app)
+    .post('/node/jenkins')
+    .send(fixture)
+    .expect(201)
+    .end((err, res) => {
+      t.equal(err, null)
+    })
+})
+
+function ignoreQueryParams (pathAndQuery) {
+  return url.parse(pathAndQuery, true).pathname
+}
+
+function readFixture (fixtureName) {
+  const content = fs.readFileSync(path.join(__dirname, '_fixtures', fixtureName)).toString()
+  return JSON.parse(content)
+}