Buildkite Lambda Function

about.md

We use this flow with AWS lambda, combined with CloudWatch Scheduled Events, to trigger our builds periodically.

It's nice, avoids duplication and keeps everything together easily.

example-event.json

{
  "organization": "your-org",
  "pipeline": "your-pipeline",
  "token": "write-only-key-here",
  "build": {
    "message": "Build Something"
  }
}

index.js

var https = require('https');

function extendHash(destination, source) {
    for (var property in source) {
        if (source.hasOwnProperty(property)) {
            destination[property] = source[property];
        }
    }
    return destination;
}

var DEFAULT_BUILD = {
  commit: "origin/master",
  branch: "master",
  message: "Triggered via CloudWatch",
  author: {
    name: "Automated Builds",
    email: "hello@world.tv"
  }
}


function isValidInput(event) {
    if(event.organization && event.pipeline && event.token) return true;
    return false;
}

function buildRequestOptions(input) {
  var options = extendHash({}, DEFAULT_BUILD);
  var build = input.build;
  if(build) extendHash(options, build);
  return options;
}

function requestPath(event) {
    return "/v2/organizations/" + event.organization + "/pipelines/" + event.pipeline + "/builds"
}

exports.handler = function(event, context) {

    if(!isValidInput(event)) {
        context.fail("Unable to generate for input data.")
        return;
    }

    var requestBody = JSON.stringify(buildRequestOptions(event));
    var path  = requestPath(event);

    var headers = {
      'Content-Type': 'application/json',
      'Content-Length': requestBody.length,
      'Authorization': ("Bearer " + event.token)
    };

    var options = {
      host: 'api.buildkite.com',
      path: path,
      port: 443,
      method: 'POST',
      headers: headers
    };

    var req = https.request(options, function(res) {
      console.log('Status:', res.statusCode);
      context.succeed();
      console.log("Succeeded...")
    });
    req.on('error', context.fail);
    req.write(requestBody);
    req.end();
}