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from BaseHTTPServer import BaseHTTPRequestHandler
class FilterMatchError(Exception):
"""Used to describe when a filter does not match a request."""
pass
class WebhookRequestHandler(BaseHTTPRequestHandler):
"""Extends the BaseHTTPRequestHandler class and handles the incoming
HTTP requests."""
def do_POST(self):
"""Invoked on incoming POST requests"""
from threading import Timer
import logging
logger = logging.getLogger()
content_type = self.headers.getheader('content-type')
content_length = int(self.headers.getheader('content-length'))
request_body = self.rfile.read(content_length)
# Extract request headers and make all keys to lowercase (makes them easier to compare)
request_headers = dict(self.headers)
request_headers = dict((k.lower(), v) for k, v in request_headers.iteritems())
ServiceRequestParser = self.figure_out_service_from_request(request_headers, request_body)
self.send_response(200)
self.send_header('Content-type', 'text/plain')
self.end_headers()
# Unable to identify the source of the request
if not ServiceRequestParser:
logger.error('Unable to find appropriate handler for request. The source service is not supported.')
return
# Could be GitHubParser, GitLabParser or other
repo_configs, ref, action, repo_urls = ServiceRequestParser(self._config).get_repo_params_from_request(request_headers, request_body)
logger.info("Event details - ref: %s; action: %s" % (ref or "master", action))
#if success:
# print "Successfullt handled request using %s" % ServiceHandler.__name__
#else:
# print "Unable to handle request using %s" % ServiceHandler.__name__
if len(repo_configs) == 0:
logger.warning('Unable to find any of the repository URLs in the config: %s' % ', '.join(repo_urls))
return
# Wait one second before we do git pull (why?)
Timer(1.0, self.process_repositories, (repo_configs,
ref,
action, request_body)).start()
def log_message(self, format, *args):
"""Overloads the default message logging method to allow messages to
go through our custom logger instead."""
import logging
logger = logging.getLogger()
logger.info("%s - - [%s] %s\n" % (self.client_address[0],
self.log_date_time_string(),
format%args))
def figure_out_service_from_request(self, request_headers, request_body):
"""Parses the incoming request and attempts to determine whether
it originates from GitHub, GitLab or any other known service."""
import json
import logging
import parsers
logger = logging.getLogger()
data = json.loads(request_body)
user_agent = 'user-agent' in request_headers and request_headers['user-agent']
content_type = 'content-type' in request_headers and request_headers['content-type']
# Assume GitLab if the X-Gitlab-Event HTTP header is set
if 'x-gitlab-event' in request_headers:
logger.info("Received event from GitLab")
return parsers.GitLabRequestParser
# Assume GitHub if the X-GitHub-Event HTTP header is set
elif 'x-github-event' in request_headers:
logger.info("Received event from GitHub")
return parsers.GitHubRequestParser
# Assume BitBucket if the User-Agent HTTP header is set to
# 'Bitbucket-Webhooks/2.0' (or something similar)
elif user_agent and user_agent.lower().find('bitbucket') != -1:
logger.info("Received event from BitBucket")
return parsers.BitBucketRequestParser
# Special Case for Gitlab CI
elif content_type == "application/json" and "build_status" in data:
logger.info('Received event from Gitlab CI')
return parsers.GitLabCIRequestParser
# This handles old GitLab requests and Gogs requests for example.
elif content_type == "application/json":
logger.info("Received event from unknown origin.")
return parsers.GenericRequestParser
logger.error("Unable to recognize request origin. Don't know how to handle the request.")
return
def process_repositories(self, repo_configs, ref, action, request_body):
import os
import time
import logging
from wrappers import GitWrapper
from lock import Lock
import json
logger = logging.getLogger()
data = json.loads(request_body)
# Process each matching repository
for repo_config in repo_configs:
try:
# Verify that all filters matches the request (if any filters are specified)
if 'filters' in repo_config:
# at least one filter must match
for filter in repo_config['filters']:
# all options specified in the filter must match
for filter_key, filter_value in filter.iteritems():
# support for earlier version so it's non-breaking functionality
if filter_key == 'action' and filter_value == action:
continue
if filter_key not in data or filter_value != data[filter_key]:
raise FilterMatchError()
except FilterMatchError as e:
# Filter does not match, do not process this repo config
continue
# In case there is no path configured for the repository, no pull will
# be made.
if not 'path' in repo_config:
GitWrapper.deploy(repo_config)
continue
running_lock = Lock(os.path.join(repo_config['path'], 'status_running'))
waiting_lock = Lock(os.path.join(repo_config['path'], 'status_waiting'))
try:
# Attempt to obtain the status_running lock
while not running_lock.obtain():
# If we're unable, try once to obtain the status_waiting lock
if not waiting_lock.has_lock() and not waiting_lock.obtain():
logger.error("Unable to obtain the status_running lock nor the status_waiting lock. Another process is " +
"already waiting, so we'll ignore the request.")
# If we're unable to obtain the waiting lock, ignore the request
break
# Keep on attempting to obtain the status_running lock until we succeed
time.sleep(5)
n = 4
while 0 < n and 0 != GitWrapper.pull(repo_config):
n -= 1
if 0 < n:
GitWrapper.deploy(repo_config)
except Exception as e:
logger.error('Error during \'pull\' or \'deploy\' operation on path: %s' % repo_config['path'])
logger.error(e)
finally:
# Release the lock if it's ours
if running_lock.has_lock():
running_lock.release()
# Release the lock if it's ours
if waiting_lock.has_lock():
waiting_lock.release()
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