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60
by Curtis Hovey
Converted gracle from a request handler to a wsgi app. |
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__metaclass__ = type |
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import httplib |
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import logging |
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import os |
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from signal import SIGKILL |
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import simplejson |
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import sys |
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from wsgiref.simple_server import make_server |
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from wsgiref.util import shift_path_info |
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from grackle.store import ( |
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MemoryStore, |
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)
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class GrackleService: |
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"""A request handler that forwards to server.store."""
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def __init__(self, store): |
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self.store = store |
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self.logger = logging.getLogger('http') |
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def __call__(self, environ, start_response): |
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self.environ = environ |
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self.start_response = start_response |
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self.method = environ['REQUEST_METHOD'] |
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self.host_port = shift_path_info(environ) |
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self.application = shift_path_info(environ) |
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self.path = environ['PATH_INFO'].split('/')[1:] |
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self.query_string = environ['QUERY_STRING'] |
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return self.handle_request() |
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def handle_request(self): |
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if self.method == 'PUT': |
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return self.do_PUT() |
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if self.method == 'POST': |
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return self.do_POST() |
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if self.method == 'GET': |
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return self.do_GET() |
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def send_response(self, code, headers={}, reason=None): |
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if reason is None: |
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62
by Curtis Hovey
No need to uppercase the reason. |
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reason = httplib.responses[code] |
|
60
by Curtis Hovey
Converted gracle from a request handler to a wsgi app. |
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response_code = '%s %s' % (code, reason) |
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response_headers = {'content-type': 'application/json'} |
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response_headers.update(headers.items()) |
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self.start_response(response_code, response_headers.items()) |
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def do_PUT(self): |
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"""Create an archive or message on PUT."""
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if len(self.path) == 1: |
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# This expected path is /archive/archive_id.
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try: |
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self.store.put_archive(self.path[0]) |
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self.send_response(httplib.CREATED) |
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return [''] |
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except Exception, error: |
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self.send_response( |
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httplib.BAD_REQUEST, reason=error.__doc__) |
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return [''] |
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if len(self.path) == 2: |
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# This expected path is /archive/archive_id/message_id.
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try: |
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put_input = self.environ['wsgi.input'] |
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message = put_input.read(int(self.environ['CONTENT_LENGTH'])) |
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self.store.put_message(self.path[0], self.path[1], message) |
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self.send_response(httplib.CREATED) |
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return [''] |
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except: |
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self.send_response(httplib.BAD_REQUEST) |
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return [''] |
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def do_POST(self): |
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"""Change a message on POST."""
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if len(self.path) == 2: |
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# This expected path is /archive/archive_id/message_id.
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try: |
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# This expected path is /archive/archive_id/message_id.
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response = self.store.hide_message( |
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self.path[0], self.path[1], self.query_string) |
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self.send_response(httplib.OK) |
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return [simplejson.dumps(response)] |
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except: |
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self.send_response(httplib.BAD_REQUEST) |
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return [''] |
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def do_GET(self): |
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"""Retrieve a list of messages on GET."""
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try: |
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response = self.store.get_messages( |
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self.path[0], self.query_string) |
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self.send_response(httplib.OK) |
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return [simplejson.dumps(response)] |
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except Exception, error: |
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self.send_response(httplib.BAD_REQUEST, reason=error.__doc__) |
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return [''] |
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def log_message(self, format, *args): |
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"""Override log_message to use standard Python logging."""
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message = "%s - - [%s] %s\n" % ( |
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self.address_string(), self.log_date_time_string(), format % args) |
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self.logger.info(message) |
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class ForkedFakeService: |
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"""A Grackle service fake, as a ContextManager."""
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def __init__(self, port, message_archives=None, write_logs=False): |
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"""Constructor.
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:param port: The tcp port to use.
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:param message_archives: A dict of lists of dicts representing
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archives of messages. The outer dict represents the archive,
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the list represents the list of messages for that archive.
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:param write_logs: If true, log messages will be written to stdout.
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"""
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self.pid = None |
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self.port = port |
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if message_archives is None: |
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self.message_archives = {} |
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else: |
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self.message_archives = message_archives |
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self.read_end, self.write_end = os.pipe() |
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self.write_logs = write_logs |
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@staticmethod
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def from_client(client, message_archives=None): |
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"""Instantiate a ForkedFakeService from the client.
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:param port: The client to provide service for.
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:param message_archives: A dict of lists of dicts representing
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archives of messages. The outer dict represents the archive,
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the list represents the list of messages for that archive.
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"""
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return ForkedFakeService(client.port, message_archives) |
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def is_ready(self): |
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"""Tell the parent process that the server is ready for writes."""
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os.write(self.write_end, 'asdf') |
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def __enter__(self): |
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"""Run the service.
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Fork and start a server in the child. Return when the server is ready
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for use."""
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pid = os.fork() |
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if pid == 0: |
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self.start_server() |
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self.pid = pid |
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os.read(self.read_end, 1) |
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return
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def start_server(self): |
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"""Start the HTTP server."""
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app = GrackleService(MemoryStore(self.message_archives)) |
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service = make_server('', self.port, app) |
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self.is_ready() |
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if self.write_logs: |
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logging.basicConfig( |
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stream=sys.stderr, level=logging.INFO) |
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service.serve_forever() |
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def __exit__(self, exc_type, exc_val, traceback): |
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os.kill(self.pid, SIGKILL) |
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def application(environ, start_response): |
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start_response('200 OK', [('Content-Type', 'text/plain')]) |
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return "Hello World" |
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if __name__ == '__main__': |
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app = GrackleService(MemoryStore({})) |
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service = make_server('', 8787, app) |
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service.serve_forever() |