~mnordhoff/loggerhead/cheezum

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#
# Copyright (C) 2008, 2009 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

"""Search for branches underneath a directory and serve them all."""

import logging
import os
import sys

from bzrlib.plugin import load_plugins

from paste import httpserver
from paste.httpexceptions import (
    HTTPExceptionHandler,
    HTTPForbidden,
    HTTPInternalServerError,
    HTTPMovedPermanently,
    )
from paste.translogger import TransLogger

from loggerhead import __version__
from loggerhead import config as _mod_config
from loggerhead.apps.transport import (
    BranchesFromTransportRoot, UserBranchesFromTransportRoot)
from loggerhead.util import Reloader
from loggerhead.apps.error import ErrorHandlerApp


def get_config_and_path(args):
    default_args = [
        '--port', '8004',
        '--host', '127.0.0.1',
        '--prefix', '/loggerhead',
        '--use-cdn',
        # Use a persistent cache directory
        # I'm disabling this code because the cache just got corrupted, so it's
        # safer when a new cache is created every time LH starts. I thought of
        # this issue when I originally wrote this code, but I never thought it
        # would actually happen.
        #'--cache-dir', '/home/mnordhoff/loggerhead/cache',
        '/srv/bzr',
    ]
    args = default_args + args

    config = _mod_config.LoggerheadConfig(args)

    if config.get_option('show_version'):
        print "loggerhead %s" % (__version__,)
        sys.exit(0)

    if config.arg_count > 1:
        config.print_help()
        sys.exit(1)
    elif config.arg_count == 1:
        base = config.get_arg(0)
    else:
        base = '.'

    if not config.get_option('allow_writes'):
        base = 'readonly+' + base

    return config, base


def setup_logging(config):
    # My logging setup is heavily based on start-loggerhead.py's
    # setup_logging()

    default_f = logging.Formatter('%(asctime)s %(levelname)-8s %(name)s: %(message)s')
    # XXX Do I need to explicitly specify the formatter in this case?
    null_f = logging.Formatter('%(message)s')

    access_log = logging.FileHandler('/home/mnordhoff/loggerhead/logs/access.log', 'a')
    access_log.setLevel(logging.INFO)
    access_log.setFormatter(null_f)

    debug_log = logging.FileHandler('/home/mnordhoff/loggerhead/logs/debug.log', 'a')
    debug_log.setLevel(logging.DEBUG)
    debug_log.setFormatter(default_f)

    stdout_log = logging.StreamHandler(sys.stdout)
    stdout_log.setLevel(logging.DEBUG)
    stdout_log.setFormatter(default_f)

    # XXX Loggerhead uses getLogger('loggerhead') here.
    logging.getLogger('').setLevel(logging.DEBUG)
    logging.getLogger('').addHandler(debug_log)
    logging.getLogger('').addHandler(stdout_log)
    # Paste's CLF-format log messages
    logging.getLogger('wsgi').addHandler(access_log)
    #logging.getLogger('wsgi').addHandler(debug_log)
    #logging.getLogger('wsgi').addHandler(stdout_log)

    def _restrict_logging(logger_name):
        logger = logging.getLogger(logger_name)
        if logger.getEffectiveLevel() < logging.INFO:
            logger.setLevel(logging.INFO)
    # simpleTAL is *very* verbose in DEBUG mode, which is otherwise the
    # default. So quiet it up a bit.
    _restrict_logging('simpleTAL')
    _restrict_logging('simpleTALES')

    return logging.getLogger('loggerhead')


def make_app_for_config_and_path(config, base):
    if config.get_option('trunk_dir') and not config.get_option('user_dirs'):
        print "--trunk-dir is only valid with --user-dirs"
        sys.exit(1)

    if config.get_option('reload'):
        if Reloader.is_installed():
            Reloader.install()
        else:
            return Reloader.restart_with_reloader()

    if config.get_option('user_dirs'):
        if not config.get_option('trunk_dir'):
            print "You didn't specify a directory for the trunk directories."
            sys.exit(1)
        app = UserBranchesFromTransportRoot(base, config)
    else:
        app = BranchesFromTransportRoot(base, config)

    setup_logging(config)

    def redirect_bzr_requests(application):
        """WSGI middleware to redirect /.bzr/ requests to /bzr"""
        def new_app(environ, start_response):
            path = environ['PATH_INFO']
            if '/.bzr/' in path:
                # This is probably always True, but I want to be careful.
                if path.startswith('/'):
                    new_url = 'http://bzr.mattnordhoff.com/bzr' + path
                else:
                    new_url = 'http://bzr.mattnordhoff.com/bzr/' + path
                raise HTTPMovedPermanently(new_url)
            return application(environ, start_response)
        return new_app

    app = redirect_bzr_requests(app)

    if config.get_option('profile'):
        from loggerhead.middleware.profile import LSProfMiddleware
        app = LSProfMiddleware(app)
    if config.get_option('memory_profile'):
        from dozer import Dozer
        app = Dozer(app)

    def block_broken_dozer_image(application):
        """One Dozer image gets thousands of pixels wide, crashing my browser.
        """
        # XXX Make the response a properly-sized image, so it displays nicely
        # on the page.
        msg = ("There is something wrong with the generation of this image, "
            "often leading to it being thousands of pixels wide and causing "
            "browser crashes, so you can't see it. Sorry.")
        def new_app(environ, start_response):
            if environ['PATH_INFO'] == '/_dozer/chart/ctypes.CFunctionType':
                raise HTTPForbidden(detail=msg)
            return application(environ, start_response)
        return new_app

    app = block_broken_dozer_image(app)

    if not config.get_option('user_prefix'):
        prefix = '/'
    else:
        prefix = config.get_option('user_prefix')
        if not prefix.startswith('/'):
            prefix = '/' + prefix

    try:
        from paste.deploy.config import PrefixMiddleware
    except ImportError:
        cant_proxy_correctly_message = (
            'Unsupported configuration: PasteDeploy not available, but '
            'loggerhead appears to be behind a proxy.')
        def check_not_proxied(app):
            def wrapped(environ, start_response):
                if 'HTTP_X_FORWARDED_SERVER' in environ:
                    exc = HTTPInternalServerError()
                    exc.explanation = cant_proxy_correctly_message
                    raise exc
                return app(environ, start_response)
            return wrapped
        app = check_not_proxied(app)
    else:
        app = PrefixMiddleware(app, prefix=prefix)

    app = HTTPExceptionHandler(app)
    app = ErrorHandlerApp(app)
    app = TransLogger(app, logger=logging.getLogger('wsgi'))

    return app


def main(args):
    load_plugins()

    config, path = get_config_and_path(args)

    app = make_app_for_config_and_path(config, path)

    if not config.get_option('user_port'):
        port = '8080'
    else:
        port = config.get_option('user_port')

    if not config.get_option('user_host'):
        host = '0.0.0.0'
    else:
        host = config.get_option('user_host')

    if not config.get_option('protocol'):
        protocol = 'http'
    else:
        protocol = config.get_option('protocol')

    if protocol == 'http':
        httpserver.serve(app,
            host=host,
            port=port,
            threadpool_options = dict(
                spawn_if_under=1,
            ),
            threadpool_workers=1,
        )
    else:
        if protocol == 'fcgi':
            from flup.server.fcgi import WSGIServer
        elif protocol == 'scgi':
            from flup.server.scgi import WSGIServer
        elif protocol == 'ajp':
            from flup.server.ajp import WSGIServer
        else:
            print 'Unknown protocol: %s.' % (protocol)
            sys.exit(1)
        WSGIServer(app, bindAddress=(host, int(port))).run()