# 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 web tests."""

import logging
import socket

from blinkpy.web_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,
            'scheme': 'http'
        }, {
            'port': 8080,
            'scheme': 'http'
        }, {
            'port': 8443,
            'scheme': 'https',
            '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()

        test_dir = self._port_obj.web_tests_dir()
        document_root = self._filesystem.join(test_dir, 'http', 'tests')
        forms_test_resources_dir = self._filesystem.join(
            test_dir, 'fast', 'forms', 'resources')
        media_resources_dir = self._filesystem.join(test_dir, 'media')
        reporting_observer_resources_dir = self._filesystem.join(
            test_dir, 'reporting-observer', 'resources')
        webaudio_resources_dir = self._filesystem.join(test_dir, 'webaudio',
                                                       'resources')
        mime_types_path = self._filesystem.join(
            self._port_obj.apache_config_directory(), 'mime.types')
        cert_file = self._filesystem.join(
            self._port_obj.apache_config_directory(), 'webkit-httpd.pem')
        inspector_sources_dir = self._port_obj.inspector_build_directory()
        generated_sources_dir = self._port_obj.generated_sources_directory()
        php_ini_dir = self._filesystem.join(test_dir, "http", "conf")

        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()

        assert self._filesystem.exists(test_dir), \
            "'%s' does not exist." % test_dir
        assert self._filesystem.exists(output_dir), \
            "'%s' does not exist." % output_dir
        assert self._filesystem.exists(inspector_sources_dir), \
            "'%s' does not exist." % inspector_sources_dir
        assert self._filesystem.exists(generated_sources_dir), \
            "'%s' does not exist." % generated_sources_dir

        # yapf: disable
        start_cmd = [
            executable,
            '-f', '%s' % self._port_obj.path_to_apache_config_file(),
            '-C', 'ServerRoot "%s"' % self._port_obj.apache_server_root(),
            '-C', 'DocumentRoot "%s"' % document_root,
            '-c', 'Alias /js-test-resources "%s/resources"' % test_dir,
            '-c', 'Alias /geolocation-api/js-test-resources "%s/geolocation-api/resources"' % test_dir,
            # TODO(509038): To be removed after bluetooth tests are ported to WPT.
            '-c', 'Alias /resources/chromium "%s/external/wpt/resources/chromium"' % test_dir,
            '-c', 'Alias /resources/testharness.js "%s/resources/testharness.js"' % test_dir,
            '-c', 'Alias /resources/testharnessreport.js "%s/resources/testharnessreport.js"' % test_dir,
            '-c', 'Alias /resources/testdriver.js "%s/resources/testdriver.js"' % test_dir,
            '-c', 'Alias /resources/testdriver-vendor.js "%s/resources/testdriver-vendor.js"' % test_dir,
            '-c', 'Alias /w3c/resources "%s/resources"' % test_dir,
            # TODO(509038): To be removed after bluetooth tests are ported to WPT.
            '-c', 'Alias /bluetooth-resources "%s/external/wpt/bluetooth/resources"' % test_dir,
            '-c', 'Alias /forms-test-resources "%s"' % forms_test_resources_dir,
            '-c', 'Alias /media-resources "%s"' % media_resources_dir,
            '-c', 'Alias /reporting-observer-resources "%s"' % reporting_observer_resources_dir,
            '-c', 'Alias /webaudio-resources "%s"' % webaudio_resources_dir,
            '-c', 'Alias /inspector-sources "%s"' % inspector_sources_dir,
            '-c', 'Alias /gen "%s"' % generated_sources_dir,
            '-c', 'Alias /wpt_internal "%s/wpt_internal"' % test_dir,
            '-c', 'TypesConfig "%s"' % mime_types_path,
            '-c', 'CustomLog "%s" common' % self._access_log_path,
            '-c', 'ErrorLog "%s"' % self._error_log_path,
            '-c', 'PHPINIDir "%s"' % php_ini_dir,
            '-c', 'PidFile %s' % self._pid_file,
            '-c', 'SSLCertificateFile "%s"' % cert_file,
            '-c', 'DefaultType None',
        ]
        # yapf: enable

        if self._is_win:
            start_cmd += [
                '-c',
                'ThreadsPerChild %d' % (self._number_of_servers * 8)
            ]
        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"' % self._port_obj.host.environ.get(
                    'USERNAME', self._port_obj.host.environ.get('USER', '')),
                '-k', 'start'
            ]

        if self._port_obj.http_server_requires_http_protocol_options_unsafe():
            start_cmd += ['-c', 'HttpProtocolOptions Unsafe']

        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)
        retval = self._process.returncode
        if retval:
            raise server_base.ServerError(
                'Failed to start %s: %s' % (self._name, retval))

        # 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',
            'ServerRoot "%s"' % self._port_obj.apache_server_root(), '-c',
            'PidFile "%s"' % self._pid_file, '-k', 'stop'
        ])
        _, err = proc.communicate()
        retval = proc.returncode
        if retval or (err and len(err)):
            raise server_base.ServerError(
                'Failed to stop %s: %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)