/brz/remove-bazaar

# Copyright (C) 2006, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import BaseHTTPServer

import errno

import httplib

import os

import posixpath

import random

import re

import SimpleHTTPServer

import socket

import SocketServer

import sys

import threading

import time

import urllib

import urlparse

from bzrlib import transport

from bzrlib.transport import local

class WebserverNotAvailable(Exception):

    pass

class BadWebserverPath(ValueError):

    def __str__(self):

        return 'path %s is not in %s' % self.args

class TestingHTTPRequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):

    """Handles one request.

    A TestingHTTPRequestHandler is instantiated for every request

    received by the associated server.

    """

    # The Message-like class used to parse the request headers

    MessageClass = httplib.HTTPMessage

    def log_message(self, format, *args):

        tcs = self.server.test_case_server

        tcs.log('webserver - %s - - [%s] %s "%s" "%s"',

                self.address_string(),

                self.log_date_time_string(),

                format % args,

                self.headers.get('referrer', '-'),

                self.headers.get('user-agent', '-'))

    def handle_one_request(self):

        """Handle a single HTTP request.

        We catch all socket errors occurring when the client close the

        connection early to avoid polluting the test results.

        """

        try:

            SimpleHTTPServer.SimpleHTTPRequestHandler.handle_one_request(self)

        except socket.error, e:

            if (len(e.args) > 0

                and e.args[0] in (errno.EPIPE, errno.ECONNRESET,

                                  errno.ECONNABORTED,)):

                self.close_connection = 1

            else:

                raise

    _range_regexp = re.compile(r'^(?P<start>\d+)-(?P<end>\d+)$')

    _tail_regexp = re.compile(r'^-(?P<tail>\d+)$')

    def parse_ranges(self, ranges_header):

        """Parse the range header value and returns ranges and tail.

        RFC2616 14.35 says that syntactically invalid range

        specifiers MUST be ignored. In that case, we return 0 for

        tail and [] for ranges.

        """

        tail = 0

        ranges = []

        if not ranges_header.startswith('bytes='):

            # Syntactically invalid header

            return 0, []

        ranges_header = ranges_header[len('bytes='):]

        for range_str in ranges_header.split(','):

            # FIXME: RFC2616 says end is optional and default to file_size

            range_match = self._range_regexp.match(range_str)

            if range_match is not None:

                start = int(range_match.group('start'))

                end = int(range_match.group('end'))

                if start > end:

                    # Syntactically invalid range

                    return 0, []

                ranges.append((start, end))

            else:

                tail_match = self._tail_regexp.match(range_str)

                if tail_match is not None:

                    tail = int(tail_match.group('tail'))

                else:

                    # Syntactically invalid range

                    return 0, []

        return tail, ranges

    def send_range_content(self, file, start, length):

        file.seek(start)

        self.wfile.write(file.read(length))

    def get_single_range(self, file, file_size, start, end):

        self.send_response(206)

        length = end - start + 1

        self.send_header('Accept-Ranges', 'bytes')

        self.send_header("Content-Length", "%d" % length)

        self.send_header("Content-Type", 'application/octet-stream')

        self.send_header("Content-Range", "bytes %d-%d/%d" % (start,

                                                              end,

                                                              file_size))

        self.end_headers()

        self.send_range_content(file, start, length)

    def get_multiple_ranges(self, file, file_size, ranges):

        self.send_response(206)

        self.send_header('Accept-Ranges', 'bytes')

        boundary = "%d" % random.randint(0,0x7FFFFFFF)

        self.send_header("Content-Type",

                         "multipart/byteranges; boundary=%s" % boundary)

        self.end_headers()

        for (start, end) in ranges:

            self.wfile.write("--%s\r\n" % boundary)

            self.send_header("Content-type", 'application/octet-stream')

            self.send_header("Content-Range", "bytes %d-%d/%d" % (start,

                                                                  end,

                                                                  file_size))

            self.end_headers()

            self.send_range_content(file, start, end - start + 1)

        # Final boundary

        self.wfile.write("--%s\r\n" % boundary)

    def do_GET(self):

        """Serve a GET request.

        Handles the Range header.

        """

        # Update statistics

        self.server.test_case_server.GET_request_nb += 1

        path = self.translate_path(self.path)

        ranges_header_value = self.headers.get('Range')

        if ranges_header_value is None or os.path.isdir(path):

            # Let the mother class handle most cases

            return SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)

        try:

            # Always read in binary mode. Opening files in text

            # mode may cause newline translations, making the

            # actual size of the content transmitted *less* than

            # the content-length!

            file = open(path, 'rb')

        except IOError:

            self.send_error(404, "File not found")

            return

        file_size = os.fstat(file.fileno())[6]

        tail, ranges = self.parse_ranges(ranges_header_value)

        # Normalize tail into ranges

        if tail != 0:

            ranges.append((file_size - tail, file_size))

        self._satisfiable_ranges = True

        if len(ranges) == 0:

            self._satisfiable_ranges = False

        else:

            def check_range(range_specifier):

                start, end = range_specifier

                # RFC2616 14.35, ranges are invalid if start >= file_size

                if start >= file_size:

                    self._satisfiable_ranges = False # Side-effect !

                    return 0, 0

                # RFC2616 14.35, end values should be truncated

                # to file_size -1 if they exceed it

                end = min(end, file_size - 1)

                return start, end

            ranges = map(check_range, ranges)

        if not self._satisfiable_ranges:

            # RFC2616 14.16 and 14.35 says that when a server

            # encounters unsatisfiable range specifiers, it

            # SHOULD return a 416.

            file.close()

            # FIXME: We SHOULD send a Content-Range header too,

            # but the implementation of send_error does not

            # allows that. So far.

            self.send_error(416, "Requested range not satisfiable")

            return

        if len(ranges) == 1:

            (start, end) = ranges[0]

            self.get_single_range(file, file_size, start, end)

        else:

            self.get_multiple_ranges(file, file_size, ranges)

        file.close()

    def translate_path(self, path):

        """Translate a /-separated PATH to the local filename syntax.

        If the server requires it, proxy the path before the usual translation

        """

        if self.server.test_case_server.proxy_requests:

            # We need to act as a proxy and accept absolute urls,

            # which SimpleHTTPRequestHandler (parent) is not

            # ready for. So we just drop the protocol://host:port

            # part in front of the request-url (because we know

            # we would not forward the request to *another*

            # proxy).

            # So we do what SimpleHTTPRequestHandler.translate_path

            # do beginning with python 2.4.3: abandon query

            # parameters, scheme, host port, etc (which ensure we

            # provide the right behaviour on all python versions).

            path = urlparse.urlparse(path)[2]

            # And now, we can apply *our* trick to proxy files

            path += '-proxied'

        return self._translate_path(path)

    def _translate_path(self, path):

        return SimpleHTTPServer.SimpleHTTPRequestHandler.translate_path(

            self, path)

    if sys.platform == 'win32':

        # On win32 you cannot access non-ascii filenames without

        # decoding them into unicode first.

        # However, under Linux, you can access bytestream paths

        # without any problems. If this function was always active

        # it would probably break tests when LANG=C was set

        def _translate_path(self, path):

            """Translate a /-separated PATH to the local filename syntax.

            For bzr, all url paths are considered to be utf8 paths.

            On Linux, you can access these paths directly over the bytestream

            request, but on win32, you must decode them, and access them

            as Unicode files.

            """

            # abandon query parameters

            path = urlparse.urlparse(path)[2]

            path = posixpath.normpath(urllib.unquote(path))

            path = path.decode('utf-8')

            words = path.split('/')

            words = filter(None, words)

            path = os.getcwdu()

            for word in words:

                drive, word = os.path.splitdrive(word)

                head, word = os.path.split(word)

                if word in (os.curdir, os.pardir): continue

                path = os.path.join(path, word)

            return path

class TestingHTTPServerWrapper(object):

    """Isolate the wrapper itself to make the server use transparent.

    Daughter classes can override any method and/or directly call the _server

    methods.

    """

    def __init__(self, server_class, test_case_server,

                 server_address, request_handler_class):

        self._server = server_class(server_address, request_handler_class)

        # test_case_server can be used to communicate between the

        # tests and the server (or the request handler and the

        # server), allowing dynamic behaviors to be defined from

        # the tests cases.

        self._server.test_case_server = test_case_server

    def __getattr__(self, name):

        return getattr(self._server, name)

    def server_bind(self):

        """Override server_bind to store the server name."""

        self._server.server_bind()

        host, port = self._server.socket.getsockname()[:2]

        self._server.server_name = socket.getfqdn(host)

        self._server.server_port = port

    def server_close(self):

         """Called to clean-up the server.

         Since the server may be (surely is, even) in a blocking listen, we

         shutdown its socket before closing it.

         """

         # Note that is this executed as part of the implicit tear down in the

         # main thread while the server runs in its own thread. The clean way

         # to tear down the server will be to instruct him to stop accepting

         # connections and wait for the current connection to end naturally. To

         # end the connection naturally, the http transports should close their

         # socket when they do not need to talk to the server anymore.  We

         # don't want to impose such a constraint on the http transports (and

         # we can't anyway ;). So we must tear down here, from the main thread,

         # when the test have ended.  Note that since the server is in a

         # blocking operation and since python use select internally, shutting

         # down the socket is reliable and relatively clean.

         self._server.socket.shutdown(socket.SHUT_RDWR)

         # Let the server properly close the socket

         self._server.server_close()

class TestingHTTPServer(TestingHTTPServerWrapper):

    def __init__(self, server_address, request_handler_class, test_case_server):

        super(TestingHTTPServer, self).__init__(

            SocketServer.TCPServer, test_case_server,

            server_address, request_handler_class)

class TestingThreadingHTTPServer(TestingHTTPServerWrapper):

    """A threading HTTP test server for HTTP 1.1.

    Since tests can initiate several concurrent connections to the same http

    server, we need an independent connection for each of them. We achieve that

    by spawning a new thread for each connection.

    """

    def __init__(self, server_address, request_handler_class, test_case_server):

        super(TestingThreadingHTTPServer, self).__init__(

            SocketServer.ThreadingTCPServer, test_case_server,

            server_address, request_handler_class)

        # Decides how threads will act upon termination of the main

        # process. This is prophylactic as we should not leave the threads

        # lying around.

        self._server.daemon_threads = True

class HttpServer(transport.Server):

    """A test server for http transports.

    Subclasses can provide a specific request handler.

    """

    # The real servers depending on the protocol

    http_server_class = {'HTTP/1.0': TestingHTTPServer,

                         'HTTP/1.1': TestingThreadingHTTPServer,

                         }

    # Whether or not we proxy the requests (see

    # TestingHTTPRequestHandler.translate_path).

    proxy_requests = False

    # used to form the url that connects to this server

    _url_protocol = 'http'

    # Subclasses can provide a specific request handler

    def __init__(self, request_handler=TestingHTTPRequestHandler):

        transport.Server.__init__(self)

        self.request_handler = request_handler

        self.host = 'localhost'

        self.port = 0

        self._httpd = None

        # Allows tests to verify number of GET requests issued

        self.GET_request_nb = 0

    def _get_httpd(self):

        if self._httpd is None:

            rhandler = self.request_handler

            proto_vers = rhandler.protocol_version

            # Create the appropriate server for the required protocol

            serv_cls = self.http_server_class.get(proto_vers, None)

            if serv_cls is None:

                raise httplib.UnknownProtocol(proto_vers)

            else:

                self._httpd = serv_cls((self.host, self.port), rhandler, self)

            host, self.port = self._httpd.socket.getsockname()

        return self._httpd

    def _http_start(self):

        """Server thread main entry point. """

        self._http_running = False

        try:

            try:

                httpd = self._get_httpd()

                self._http_base_url = '%s://%s:%s/' % (self._url_protocol,

                                                       self.host, self.port)

                self._http_running = True

            except:

                # Whatever goes wrong, we save the exception for the main

                # thread. Note that since we are running in a thread, no signal

                # can be received, so we don't care about KeyboardInterrupt.

                self._http_exception = sys.exc_info()

        finally:

            # Release the lock or the main thread will block and the whole

            # process will hang.

            self._http_starting.release()

        # From now on, exceptions are taken care of by the

        # SocketServer.BaseServer or the request handler.

        while self._http_running:

            try:

                # Really an HTTP connection but the python framework is generic

                # and call them requests

                httpd.handle_request()

            except socket.timeout:

                pass

    def _get_remote_url(self, path):

        path_parts = path.split(os.path.sep)

        if os.path.isabs(path):

            if path_parts[:len(self._local_path_parts)] != \

                   self._local_path_parts:

                raise BadWebserverPath(path, self.test_dir)

            remote_path = '/'.join(path_parts[len(self._local_path_parts):])

        else:

            remote_path = '/'.join(path_parts)

        return self._http_base_url + remote_path

    def log(self, format, *args):

        """Capture Server log output."""

        self.logs.append(format % args)

    def setUp(self, backing_transport_server=None):

        """See bzrlib.transport.Server.setUp.

        :param backing_transport_server: The transport that requests over this

            protocol should be forwarded to. Note that this is currently not

            supported for HTTP.

        """

        # XXX: TODO: make the server back onto vfs_server rather than local

        # disk.

        assert backing_transport_server is None or \

            isinstance(backing_transport_server, local.LocalURLServer), \

            "HTTPServer currently assumes local transport, got %s" % \

            backing_transport_server

        self._home_dir = os.getcwdu()

        self._local_path_parts = self._home_dir.split(os.path.sep)

        self._http_base_url = None

        # Create the server thread

        self._http_starting = threading.Lock()

        self._http_starting.acquire()

        self._http_thread = threading.Thread(target=self._http_start)

        self._http_thread.setDaemon(True)

        self._http_exception = None

        self._http_thread.start()

        # Wait for the server thread to start (i.e release the lock)

        self._http_starting.acquire()

        if self._http_exception is not None:

            exc_class, exc_value, exc_tb = self._http_exception

            raise exc_class, exc_value, exc_tb

        self._http_starting.release()

        self.logs = []

    def tearDown(self):

        """See bzrlib.transport.Server.tearDown."""

        self._httpd.server_close()

        self._http_running = False

        self._http_thread.join()

    def get_url(self):

        """See bzrlib.transport.Server.get_url."""

        return self._get_remote_url(self._home_dir)

    def get_bogus_url(self):

        """See bzrlib.transport.Server.get_bogus_url."""

        # this is chosen to try to prevent trouble with proxies, weird dns,

        # etc

        return self._url_protocol + '://127.0.0.1:1/'

class HttpServer_urllib(HttpServer):

    """Subclass of HttpServer that gives http+urllib urls.

    This is for use in testing: connections to this server will always go

    through urllib where possible.

    """

    # urls returned by this server should require the urllib client impl

    _url_protocol = 'http+urllib'

class HttpServer_PyCurl(HttpServer):

    """Subclass of HttpServer that gives http+pycurl urls.

    This is for use in testing: connections to this server will always go

    through pycurl where possible.

    """

    # We don't care about checking the pycurl availability as

    # this server will be required only when pycurl is present

    # urls returned by this server should require the pycurl client impl

    _url_protocol = 'http+pycurl'