~didrocks/unity/altf10 : contents of grackle/service.py at revision 67

~didrocks/unity/altf10 : (revision 67)

__metaclass__ = type

import httplib
import logging
import os
from signal import SIGKILL
import simplejson
import sys
from wsgiref.simple_server import make_server
from wsgiref.util import shift_path_info
from grackle.store import (
    MemoryStore,
    )


class GrackleService:
    """A request handler that forwards to server.store."""

    def __init__(self, store):
        self.store = store
        self.logger = logging.getLogger('http')

    def __call__(self, environ, start_response):
        self.environ = environ
        self.start_response = start_response
        self.method = environ['REQUEST_METHOD']
        self.host_port = shift_path_info(environ)
        self.application = shift_path_info(environ)
        self.path = environ['PATH_INFO'].split('/')[1:]
        self.query_string = environ['QUERY_STRING']
        return self.handle_request()

    def handle_request(self):
        if self.method == 'PUT':
            return self.do_PUT()
        if self.method == 'POST':
            return self.do_POST()
        if self.method == 'GET':
            return self.do_GET()

    def send_response(self, code, response='', reason=None, headers={}):
        if reason is None:
            reason = httplib.responses[code]
        response_code = '%s %s' % (code, reason)
        response_headers = {'content-type': 'application/json'}
        response_headers.update(headers.items())
        self.start_response(response_code, response_headers.items())
        return [response]

    def do_PUT(self):
        """Create an archive or message on PUT."""
        if len(self.path) == 1:
            # This expected path is /archive/archive_id.
            try:
                self.store.put_archive(self.path[0])
                return self.send_response(httplib.CREATED)
            except Exception, error:
                return self.send_response(
                    httplib.BAD_REQUEST, reason=error.__doc__)
        elif len(self.path) == 2:
            # This expected path is /archive/archive_id/message_id.
            try:
                put_input = self.environ['wsgi.input']
                message = put_input.read(int(self.environ['CONTENT_LENGTH']))
                self.store.put_message(self.path[0], self.path[1], message)
                return self.send_response(httplib.CREATED)
            except Exception, error:
                return self.send_response(
                    httplib.BAD_REQUEST, reason=error.__doc__)

    def do_POST(self):
        """Change a message on POST."""
        if len(self.path) == 2:
            # This expected path is /archive/archive_id/message_id.
            try:
                # This expected path is /archive/archive_id/message_id.
                response = self.store.hide_message(
                    self.path[0], self.path[1], self.query_string)
                response = simplejson.dumps(response)
                return self.send_response(httplib.OK, response=response)
            except Exception, error:
                return self.send_response(
                    httplib.BAD_REQUEST, reason=error.__doc__)

    def do_GET(self):
        """Retrieve a list of messages on GET."""
        try:
            response = self.store.get_messages(
                self.path[0], self.query_string)
            response = simplejson.dumps(response)
            return self.send_response(httplib.OK, response=response)
        except Exception, error:
            return self.send_response(
                httplib.BAD_REQUEST, reason=error.__doc__)

    def log_message(self, format, *args):
        """Override log_message to use standard Python logging."""
        message = "%s - - [%s] %s\n" % (
            self.address_string(), self.log_date_time_string(), format % args)
        self.logger.info(message)


class ForkedFakeService:
    """A Grackle service fake, as a ContextManager."""

    def __init__(self, port, message_archives=None, write_logs=False):
        """Constructor.

        :param port: The tcp port to use.
        :param message_archives: A dict of lists of dicts representing
            archives of messages. The outer dict represents the archive,
            the list represents the list of messages for that archive.
        :param write_logs: If true, log messages will be written to stdout.
        """
        self.pid = None
        self.port = port
        if message_archives is None:
            self.message_archives = {}
        else:
            self.message_archives = message_archives
        self.read_end, self.write_end = os.pipe()
        self.write_logs = write_logs

    @staticmethod
    def from_client(client, message_archives=None):
        """Instantiate a ForkedFakeService from the client.

        :param port: The client to provide service for.
        :param message_archives: A dict of lists of dicts representing
            archives of messages. The outer dict represents the archive,
            the list represents the list of messages for that archive.
        """
        return ForkedFakeService(client.port, message_archives)

    def is_ready(self):
        """Tell the parent process that the server is ready for writes."""
        os.write(self.write_end, 'asdf')

    def __enter__(self):
        """Run the service.

        Fork and start a server in the child.  Return when the server is ready
        for use."""
        pid = os.fork()
        if pid == 0:
            self.start_server()
        self.pid = pid
        os.read(self.read_end, 1)
        return

    def start_server(self):
        """Start the HTTP server."""
        app = GrackleService(MemoryStore(self.message_archives))
        service = make_server('', self.port, app)
        self.is_ready()
        if self.write_logs:
            logging.basicConfig(
                stream=sys.stderr, level=logging.INFO)
        service.serve_forever()

    def __exit__(self, exc_type, exc_val, traceback):
        os.kill(self.pid, SIGKILL)


def application(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/plain')])
    return "Hello World"


if __name__ == '__main__':
    app = GrackleService(MemoryStore({}))
    service = make_server('', 8787, app)
    service.serve_forever()

60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	1	__metaclass__ = type
	2
	3	import httplib
	4	import logging
	5	import os
	6	from signal import SIGKILL
	7	import simplejson
	8	import sys
	9	from wsgiref.simple_server import make_server
	10	from wsgiref.util import shift_path_info
	11	from grackle.store import (
	12	MemoryStore,
	13	)
	14
	15
	16	class GrackleService:
	17	"""A request handler that forwards to server.store."""
	18
	19	def __init__(self, store):
	20	self.store = store
	21	self.logger = logging.getLogger('http')
	22
	23	def __call__(self, environ, start_response):
	24	self.environ = environ
	25	self.start_response = start_response
	26	self.method = environ['REQUEST_METHOD']
	27	self.host_port = shift_path_info(environ)
	28	self.application = shift_path_info(environ)
	29	self.path = environ['PATH_INFO'].split('/')[1:]
	30	self.query_string = environ['QUERY_STRING']
	31	return self.handle_request()
	32
	33	def handle_request(self):
	34	if self.method == 'PUT':
	35	return self.do_PUT()
	36	if self.method == 'POST':
	37	return self.do_POST()
	38	if self.method == 'GET':
	39	return self.do_GET()
	40
67 by Curtis Hovey Change argument order to reflect common usage.	41	def send_response(self, code, response='', reason=None, headers={}):
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	42	if reason is None:
62 by Curtis Hovey No need to uppercase the reason.	43	reason = httplib.responses[code]
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	44	response_code = '%s %s' % (code, reason)
	45	response_headers = {'content-type': 'application/json'}
	46	response_headers.update(headers.items())
	47	self.start_response(response_code, response_headers.items())
66 by Curtis Hovey use send response to ensure a list of strings is returned.	48	return [response]
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	49
	50	def do_PUT(self):
	51	"""Create an archive or message on PUT."""
	52	if len(self.path) == 1:
	53	# This expected path is /archive/archive_id.
	54	try:
	55	self.store.put_archive(self.path[0])
66 by Curtis Hovey use send response to ensure a list of strings is returned.	56	return self.send_response(httplib.CREATED)
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	57	except Exception, error:
66 by Curtis Hovey use send response to ensure a list of strings is returned.	58	return self.send_response(
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	59	httplib.BAD_REQUEST, reason=error.__doc__)
64 by Curtis Hovey do_PUT aways returns a empty list.	60	elif len(self.path) == 2:
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	61	# This expected path is /archive/archive_id/message_id.
	62	try:
	63	put_input = self.environ['wsgi.input']
	64	message = put_input.read(int(self.environ['CONTENT_LENGTH']))
	65	self.store.put_message(self.path[0], self.path[1], message)
66 by Curtis Hovey use send response to ensure a list of strings is returned.	66	return self.send_response(httplib.CREATED)
65 by Curtis Hovey Always return the error reason.	67	except Exception, error:
66 by Curtis Hovey use send response to ensure a list of strings is returned.	68	return self.send_response(
65 by Curtis Hovey Always return the error reason.	69	httplib.BAD_REQUEST, reason=error.__doc__)
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	70
	71	def do_POST(self):
	72	"""Change a message on POST."""
	73	if len(self.path) == 2:
	74	# This expected path is /archive/archive_id/message_id.
	75	try:
	76	# This expected path is /archive/archive_id/message_id.
	77	response = self.store.hide_message(
	78	self.path[0], self.path[1], self.query_string)
66 by Curtis Hovey use send response to ensure a list of strings is returned.	79	response = simplejson.dumps(response)
	80	return self.send_response(httplib.OK, response=response)
65 by Curtis Hovey Always return the error reason.	81	except Exception, error:
66 by Curtis Hovey use send response to ensure a list of strings is returned.	82	return self.send_response(
	83	httplib.BAD_REQUEST, reason=error.__doc__)
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	84
	85	def do_GET(self):
	86	"""Retrieve a list of messages on GET."""
	87	try:
	88	response = self.store.get_messages(
	89	self.path[0], self.query_string)
66 by Curtis Hovey use send response to ensure a list of strings is returned.	90	response = simplejson.dumps(response)
	91	return self.send_response(httplib.OK, response=response)
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	92	except Exception, error:
66 by Curtis Hovey use send response to ensure a list of strings is returned.	93	return self.send_response(
	94	httplib.BAD_REQUEST, reason=error.__doc__)
60 by Curtis Hovey Converted gracle from a request handler to a wsgi app.	95
	96	def log_message(self, format, *args):
	97	"""Override log_message to use standard Python logging."""
	98	message = "%s - - [%s] %s\n" % (
	99	self.address_string(), self.log_date_time_string(), format % args)
	100	self.logger.info(message)
	101
	102
	103	class ForkedFakeService:
	104	"""A Grackle service fake, as a ContextManager."""
	105
	106	def __init__(self, port, message_archives=None, write_logs=False):
	107	"""Constructor.
	108
	109	:param port: The tcp port to use.
	110	:param message_archives: A dict of lists of dicts representing
	111	archives of messages. The outer dict represents the archive,
	112	the list represents the list of messages for that archive.
	113	:param write_logs: If true, log messages will be written to stdout.
	114	"""
	115	self.pid = None
	116	self.port = port
	117	if message_archives is None:
	118	self.message_archives = {}
	119	else:
	120	self.message_archives = message_archives
	121	self.read_end, self.write_end = os.pipe()
	122	self.write_logs = write_logs
	123
	124	@staticmethod
	125	def from_client(client, message_archives=None):
	126	"""Instantiate a ForkedFakeService from the client.
	127
	128	:param port: The client to provide service for.
	129	:param message_archives: A dict of lists of dicts representing
	130	archives of messages. The outer dict represents the archive,
	131	the list represents the list of messages for that archive.
	132	"""
	133	return ForkedFakeService(client.port, message_archives)
	134
	135	def is_ready(self):
	136	"""Tell the parent process that the server is ready for writes."""
	137	os.write(self.write_end, 'asdf')
	138
	139	def __enter__(self):
	140	"""Run the service.
	141
	142	Fork and start a server in the child. Return when the server is ready
	143	for use."""
	144	pid = os.fork()
	145	if pid == 0:
	146	self.start_server()
	147	self.pid = pid
	148	os.read(self.read_end, 1)
	149	return
	150
	151	def start_server(self):
	152	"""Start the HTTP server."""
	153	app = GrackleService(MemoryStore(self.message_archives))
	154	service = make_server('', self.port, app)
	155	self.is_ready()
	156	if self.write_logs:
	157	logging.basicConfig(
	158	stream=sys.stderr, level=logging.INFO)
159	service.serve_forever()
160
161	def __exit__(self, exc_type, exc_val, traceback):
162	os.kill(self.pid, SIGKILL)
163
164
165	def application(environ, start_response):
166	start_response('200 OK', [('Content-Type', 'text/plain')])
167	return "Hello World"
168
169
170	if __name__ == '__main__':
171	app = GrackleService(MemoryStore({}))
172	service = make_server('', 8787, app)
173	service.serve_forever()