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github_buildbot.py
executable file
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github_buildbot.py
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#!/usr/bin/env python
"""
github_buildbot.py is based on git_buildbot.py. Last revised on 2014-02-20.
github_buildbot.py will determine the repository information from the JSON
HTTP POST it receives from github.com and build the appropriate repository.
If your github repository is private, you must add a ssh key to the github
repository for the user who initiated the build on the buildslave.
This version of github_buildbot.py parses v3 of the github webhook api, with the
"application.vnd.github.v3+json" payload. Configure *only* "push" events to
trigger this webhook.
"""
import hmac
import logging
import os
import sys
from hashlib import sha1
from httplib import ACCEPTED
from httplib import BAD_REQUEST
from httplib import INTERNAL_SERVER_ERROR
from httplib import OK
from optparse import OptionParser
from twisted.cred import credentials
from twisted.internet import reactor
from twisted.spread import pb
from twisted.web import resource
from twisted.web import server
try:
import json
except ImportError:
import simplejson as json
class GitHubBuildBot(resource.Resource):
"""
GitHubBuildBot creates the webserver that responds to the GitHub Service
Hook.
"""
isLeaf = True
master = None
port = None
def render_POST(self, request):
"""
Responds only to POST events and starts the build process
:arguments:
request
the http request object
"""
# All responses are application/json
request.setHeader("Content-Type", "application/json")
content = request.content.read()
# Verify the message if a secret was provided
#
# NOTE: We always respond with '400 BAD REQUEST' if we can't
# validate the message. This is done to prevent malicious
# requests from learning about why they failed to POST data
# to us.
if self.secret is not None:
signature = request.getHeader("X-Hub-Signature")
if signature is None:
logging.error("Rejecting request. Signature is missing.")
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
try:
hash_type, hexdigest = signature.split("=")
except ValueError:
logging.error("Rejecting request. Bad signature format.")
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
else:
# sha1 is hard coded into github's source code so it's
# unlikely this will ever change.
if hash_type != "sha1":
logging.error("Rejecting request. Unexpected hash type.")
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
mac = hmac.new(self.secret, msg=content, digestmod=sha1)
if mac.hexdigest() != hexdigest:
logging.error("Rejecting request. Hash mismatch.")
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
event_type = request.getHeader("X-GitHub-Event")
logging.debug("X-GitHub-Event: %r", event_type)
if event_type == "ping":
request.setResponseCode(OK)
return json.dumps({"result": "pong"})
# Reject non-push, non-ping events
if event_type != "push":
logging.info(
"Rejecting request. Expected a push event but received %r instead.",
event_type)
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
try:
content_type = request.getHeader("Content-Type")
if content_type == "application/json":
payload = json.loads(content)
elif content_type == "application/x-www-form-urlencoded":
payload = json.loads(request.args["payload"][0])
else:
logging.info(
"Rejecting request. Unknown 'Content-Type', received %r",
content_type)
request.setResponseCode(BAD_REQUEST)
return json.dumps({"error": "Bad Request."})
logging.debug("Payload: %r", payload)
user = payload['pusher']['name']
repo = payload['repository']['name']
repo_url = payload['repository']['url']
self.private = payload['repository']['private']
project = request.args.get('project', None)
if project:
project = project[0]
self.process_change(payload, user, repo, repo_url, project, request)
return server.NOT_DONE_YET
except Exception, e:
logging.exception(e)
request.setResponseCode(INTERNAL_SERVER_ERROR)
return json.dumps({"error": e.message})
def process_change(self, payload, user, repo, repo_url, project, request):
"""
Consumes the JSON as a python object and actually starts the build.
:arguments:
payload
Python Object that represents the JSON sent by GitHub Service
Hook.
"""
changes = None
branch = payload['ref'].split('/')[-1]
if payload['deleted'] is True:
logging.info("Branch %r deleted, ignoring", branch)
else:
changes = []
for change in payload['commits']:
files = change['added'] + change['removed'] + change['modified']
who = "%s <%s>" % (
change['author']['username'], change['author']['email'])
changes.append(
{'revision': change['id'],
'revlink': change['url'],
'who': who,
'comments': change['message'],
'repository': payload['repository']['url'],
'files': files,
'project': project,
'branch': branch})
if not changes:
logging.warning("No changes found")
request.setResponseCode(OK)
request.write(json.dumps({"result": "No changes found."}))
request.finish()
return
host, port = self.master.split(':')
port = int(port)
if self.auth is not None:
auth = credentials.UsernamePassword(*self.auth.split(":"))
else:
auth = credentials.Anonymous()
factory = pb.PBClientFactory()
deferred = factory.login(auth)
reactor.connectTCP(host, port, factory)
deferred.addErrback(self.connectFailed, request)
deferred.addCallback(self.connected, changes, request)
def connectFailed(self, error, request):
"""
If connection is failed. Logs the error.
"""
logging.error("Could not connect to master: %s",
error.getErrorMessage())
request.setResponseCode(INTERNAL_SERVER_ERROR)
request.write(
json.dumps({"error": "Failed to connect to buildbot master."}))
request.finish()
return error
def addChange(self, _, remote, changei, src='git'):
"""
Sends changes from the commit to the buildmaster.
"""
logging.debug("addChange %r, %r", remote, changei)
try:
change = changei.next()
except StopIteration:
remote.broker.transport.loseConnection()
return None
logging.info("New revision: %s", change['revision'][:8])
for key, value in change.iteritems():
logging.debug(" %s: %s", key, value)
change['src'] = src
deferred = remote.callRemote('addChange', change)
deferred.addCallback(self.addChange, remote, changei, src)
return deferred
def connected(self, remote, changes, request):
"""
Responds to the connected event.
"""
# By this point we've connected to buildbot so
# we don't really need to keep github waiting any
# longer
request.setResponseCode(ACCEPTED)
request.write(json.dumps({"result": "Submitting changes."}))
request.finish()
return self.addChange(None, remote, changes.__iter__())
def setup_options():
"""
The main event loop that starts the server and configures it.
"""
usage = "usage: %prog [options]"
parser = OptionParser(usage)
parser.add_option("-p", "--port",
help="Port the HTTP server listens to for the GitHub "
"Service Hook [default: %default]",
default=9001, type=int, dest="port")
parser.add_option("-m", "--buildmaster",
help="Buildbot Master host and port. ie: localhost:9989 "
"[default: %default]",
default="localhost:9989", dest="buildmaster")
parser.add_option("--auth",
help="The username and password, separated by a colon, "
"to use when connecting to buildbot over the "
"perspective broker.",
default="change:changepw", dest="auth")
parser.add_option("--secret",
help="If provided then use the X-Hub-Signature header "
"to verify that the request is coming from "
"github. [default: %default]",
default=None, dest="secret")
parser.add_option("-l", "--log",
help="The absolute path, including filename, to save the "
"log to [default: %default]. This may also be "
"'stdout' indicating logs should output directly to "
"standard output instead.",
default="github_buildbot.log", dest="log")
parser.add_option("-L", "--level",
help="The logging level: debug, info, warn, error, "
"fatal [default: %default]", default='warn',
dest="level",
choices=("debug", "info", "warn", "error", "fatal"))
parser.add_option("-g", "--github",
help="The github server. Changing this is useful if"
" you've specified a specific HOST handle in "
"~/.ssh/config for github [default: %default]",
default='github.com', dest="github")
parser.add_option("--pidfile",
help="Write the process identifier (PID) to this "
"file on start. The file is removed on clean "
"exit. [default: %default]",
default=None, dest="pidfile")
(options, _) = parser.parse_args()
if options.auth is not None and ":" not in options.auth:
parser.error("--auth did not contain ':'")
if options.pidfile:
with open(options.pidfile, 'w') as f:
f.write(str(os.getpid()))
filename = options.log
log_format = "%(asctime)s - %(levelname)s - %(message)s"
if options.log != "stdout":
logging.basicConfig(filename=filename, format=log_format,
level=logging._levelNames[options.level.upper()])
else:
logging.basicConfig(format=log_format,
handlers=[logging.StreamHandler(stream=sys.stdout)],
level=logging._levelNames[options.level.upper()])
return options
def run_hook(options):
github_bot = GitHubBuildBot()
github_bot.github = options.github
github_bot.master = options.buildmaster
github_bot.secret = options.secret
github_bot.auth = options.auth
site = server.Site(github_bot)
reactor.listenTCP(options.port, site)
reactor.run()
def main():
options = setup_options()
run_hook(options)
if __name__ == '__main__':
main()