# Copyright (C) 2011 Google Inc. All rights reserved.
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"""Start and stop the Apache HTTP server as it is used by the layout tests."""

import logging
import os
import socket

from webkitpy.layout_tests.servers import server_base


_log = logging.getLogger(__name__)


class ApacheHTTP(server_base.ServerBase):
    def __init__(self, port_obj, output_dir, additional_dirs, number_of_servers):
        super(ApacheHTTP, self).__init__(port_obj, output_dir)
        # We use the name "httpd" instead of "apache" to make our paths (e.g. the pid file: /tmp/WebKit/httpd.pid)
        # match old-run-webkit-tests: https://bugs.webkit.org/show_bug.cgi?id=63956
        self._name = 'httpd'
        self._log_prefixes = ('access_log', 'error_log')
        self._mappings = [{'port': 8000},
                          {'port': 8080},
                          {'port': 8443, 'sslcert': True}]
        self._number_of_servers = number_of_servers

        self._pid_file = self._filesystem.join(self._runtime_path, '%s.pid' % self._name)

        executable = self._port_obj.path_to_apache()
        server_root = self._filesystem.dirname(self._filesystem.dirname(executable))

        test_dir = self._port_obj.layout_tests_dir()
        document_root = self._filesystem.join(test_dir, "http", "tests")
        js_test_resources_dir = self._filesystem.join(test_dir, "resources")
        media_resources_dir = self._filesystem.join(test_dir, "media")
        mime_types_path = self._filesystem.join(test_dir, "http", "conf", "mime.types")
        cert_file = self._filesystem.join(test_dir, "http", "conf", "webkit-httpd.pem")

        self._access_log_path = self._filesystem.join(output_dir, "access_log.txt")
        self._error_log_path = self._filesystem.join(output_dir, "error_log.txt")

        self._is_win = self._port_obj.host.platform.is_win()

        start_cmd = [executable,
            '-f', '%s' % self._port_obj.path_to_apache_config_file(),
            '-C', 'ServerRoot "%s"' % server_root,
            '-C', 'DocumentRoot "%s"' % document_root,
            '-c', 'Alias /js-test-resources "%s"' % js_test_resources_dir,
            '-c', 'Alias /media-resources "%s"' % media_resources_dir,
            '-c', 'TypesConfig "%s"' % mime_types_path,
            '-c', 'CustomLog "%s" common' % self._access_log_path,
            '-c', 'ErrorLog "%s"' % self._error_log_path,
            '-c', 'PidFile %s' % self._pid_file,
            '-c', 'SSLCertificateFile "%s"' % cert_file,
            ]

        if self._is_win:
            start_cmd += ['-c', "ThreadsPerChild %d" % (self._number_of_servers * 2)]
        else:
            start_cmd += ['-c', "StartServers %d" % self._number_of_servers,
                          '-c', "MinSpareServers %d" % self._number_of_servers,
                          '-c', "MaxSpareServers %d" % self._number_of_servers,
                          '-C', 'User "%s"' % os.environ.get('USERNAME', os.environ.get('USER', '')),
                          '-k', 'start']

        enable_ipv6 = self._port_obj.http_server_supports_ipv6()
        # Perform part of the checks Apache's APR does when trying to listen to
        # a specific host/port. This allows us to avoid trying to listen to
        # IPV6 addresses when it fails on Apache. APR itself tries to call
        # getaddrinfo() again without AI_ADDRCONFIG if the first call fails
        # with EBADFLAGS, but that is not how it normally fails in our use
        # cases, so ignore that for now.
        # See https://bugs.webkit.org/show_bug.cgi?id=98602#c7
        try:
            socket.getaddrinfo('::1', 0, 0, 0, 0, socket.AI_ADDRCONFIG)
        except:
            enable_ipv6 = False

        for mapping in self._mappings:
            port = mapping['port']

            start_cmd += ['-C', "Listen 127.0.0.1:%d" % port]

            # We listen to both IPv4 and IPv6 loop-back addresses, but ignore
            # requests to 8000 from random users on network.
            # See https://bugs.webkit.org/show_bug.cgi?id=37104
            if enable_ipv6:
                start_cmd += ['-C', "Listen [::1]:%d" % port]

        if additional_dirs:
            self._start_cmd = start_cmd
            for alias, path in additional_dirs.iteritems():
                start_cmd += ['-c', 'Alias %s "%s"' % (alias, path),
                        # Disable CGI handler for additional dirs.
                        '-c', '<Location %s>' % alias,
                        '-c', 'RemoveHandler .cgi .pl',
                        '-c', '</Location>']

        self._start_cmd = start_cmd

    def _spawn_process(self):
        _log.debug('Starting %s server, cmd="%s"' % (self._name, str(self._start_cmd)))
        self._process = self._executive.popen(self._start_cmd, stderr=self._executive.PIPE)
        if self._process.returncode is not None:
            retval = self._process.returncode
            err = self._process.stderr.read()
            if retval or len(err):
                raise server_base.ServerError('Failed to start %s: %s' % (self._name, err))

        # For some reason apache isn't guaranteed to have created the pid file before
        # the process exits, so we wait a little while longer.
        if not self._wait_for_action(lambda: self._filesystem.exists(self._pid_file)):
            self._log_errors_from_subprocess()
            raise server_base.ServerError('Failed to start %s: no pid file found' % self._name)

        return int(self._filesystem.read_text_file(self._pid_file))

    def stop(self):
        self._stop_running_server()

    def _stop_running_server(self):
        # If apache was forcefully killed, the pid file will not have been deleted, so check
        # that the process specified by the pid_file no longer exists before deleting the file.
        if self._pid and not self._executive.check_running_pid(self._pid):
            self._filesystem.remove(self._pid_file)
            return

        if self._is_win:
            self._executive.kill_process(self._pid)
            return

        proc = self._executive.popen([self._port_obj.path_to_apache(),
                                      '-f', self._port_obj.path_to_apache_config_file(),
                                      '-c', 'PidFile "%s"' % self._pid_file,
                                      '-k', 'stop'], stderr=self._executive.PIPE)
        proc.wait()
        retval = proc.returncode
        err = proc.stderr.read()
        if retval or len(err):
            raise server_base.ServerError('Failed to stop %s: %s' % (self._name, err))

        # For some reason apache isn't guaranteed to have actually stopped after
        # the stop command returns, so we wait a little while longer for the
        # pid file to be removed.
        if not self._wait_for_action(lambda: not self._filesystem.exists(self._pid_file)):
            raise server_base.ServerError('Failed to stop %s: pid file still exists' % self._name)