#!/usr/bin/env python

#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#

import platform
import copy
import os
import signal
import socket
import subprocess
import sys
import time
from optparse import OptionParser

from util import local_libpath

SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))

SCRIPTS = [
    'FastbinaryTest.py',
    'TestFrozen.py',
    'TestRenderedDoubleConstants.py',
    'TSimpleJSONProtocolTest.py',
    'SerializationTest.py',
    'TestEof.py',
    'TestSyntax.py',
    'TestSocket.py',
    'TestTypes.py'
]
FRAMED = ["TNonblockingServer"]
SKIP_ZLIB = ['TNonblockingServer', 'THttpServer']
SKIP_SSL = ['THttpServer']
EXTRA_DELAY = dict(TProcessPoolServer=5.5)

PROTOS = [
    'accel',
    'accelc',
    'binary',
    'compact',
    'json',
    'header',
]


def default_servers():
    servers = [
        'TSimpleServer',
        'TThreadedServer',
        'TThreadPoolServer',
        'TNonblockingServer',
        'THttpServer',
    ]
    if platform.system() != 'Windows':
        servers.append('TProcessPoolServer')
        servers.append('TForkingServer')
    return servers


def relfile(fname):
    return os.path.join(SCRIPT_DIR, fname)


def setup_pypath(libdir, gendir):
    dirs = [libdir, gendir]
    env = copy.deepcopy(os.environ)
    pypath = env.get('PYTHONPATH', None)
    if pypath:
        dirs.append(pypath)
    env['PYTHONPATH'] = os.pathsep.join(dirs)
    if gendir.endswith('gen-py-no_utf8strings'):
        env['THRIFT_TEST_PY_NO_UTF8STRINGS'] = '1'
    return env


def runScriptTest(libdir, genbase, genpydir, script):
    env = setup_pypath(libdir, os.path.join(genbase, genpydir))
    script_args = [sys.executable, relfile(script)]
    print('\nTesting script: %s\n----' % (' '.join(script_args)))
    ret = subprocess.call(script_args, env=env)
    if ret != 0:
        print('*** FAILED ***', file=sys.stderr)
        print('LIBDIR: %s' % libdir, file=sys.stderr)
        print('PY_GEN: %s' % genpydir, file=sys.stderr)
        print('SCRIPT: %s' % script, file=sys.stderr)
        raise Exception("Script subprocess failed, retcode=%d, args: %s" % (ret, ' '.join(script_args)))


def pick_unused_port():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.bind(('127.0.0.1', 0))
    port = sock.getsockname()[1]
    sock.close()
    return port


def runServiceTest(libdir, genbase, genpydir, server_class, proto, port, use_zlib, use_ssl, verbose):
    env = setup_pypath(libdir, os.path.join(genbase, genpydir))
    # Build command line arguments
    server_args = [sys.executable, relfile('TestServer.py')]
    cli_args = [sys.executable, relfile('TestClient.py')]
    for which in (server_args, cli_args):
        which.append('--protocol=%s' % proto)  # accel, binary, compact or json
        which.append('--port=%d' % port)  # default to 9090
        if use_zlib:
            which.append('--zlib')
        if use_ssl:
            which.append('--ssl')
        if verbose == 0:
            which.append('-q')
        if verbose == 2:
            which.append('-v')
    # server-specific option to select server class
    server_args.append(server_class)
    # client-specific cmdline options
    if server_class in FRAMED:
        cli_args.append('--transport=framed')
    else:
        cli_args.append('--transport=buffered')
    if server_class == 'THttpServer':
        cli_args.append('--http=/')
    if verbose > 0:
        print('Testing server %s: %s' % (server_class, ' '.join(server_args)))
    popen_kwargs = {'env': env}
    # Windows uses process groups; POSIX starts a new session so we can killpg().
    if platform.system() == 'Windows':
        if hasattr(subprocess, 'CREATE_NEW_PROCESS_GROUP'):
            popen_kwargs['creationflags'] = subprocess.CREATE_NEW_PROCESS_GROUP
    else:
        popen_kwargs['start_new_session'] = True
    serverproc = subprocess.Popen(server_args, **popen_kwargs)

    def ensureServerAlive():
        if serverproc.poll() is not None:
            print(('FAIL: Server process (%s) failed with retcode %d')
                  % (' '.join(server_args), serverproc.returncode))
            raise Exception('Server subprocess %s died, args: %s'
                            % (server_class, ' '.join(server_args)))

    # Wait for the server to start accepting connections on the given port.
    sleep_time = 0.1  # Seconds
    max_attempts = 100
    attempt = 0
    while True:
        sock4 = socket.socket()
        sock6 = socket.socket(socket.AF_INET6)
        try:
            if sock4.connect_ex(('127.0.0.1', port)) == 0 \
                    or sock6.connect_ex(('::1', port)) == 0:
                break
            attempt += 1
            if attempt >= max_attempts:
                raise Exception("TestServer not ready on port %d after %.2f seconds"
                                % (port, sleep_time * attempt))
            ensureServerAlive()
            time.sleep(sleep_time)
        finally:
            sock4.close()
            sock6.close()

    try:
        if verbose > 0:
            print('Testing client: %s' % (' '.join(cli_args)))
        ret = subprocess.call(cli_args, env=env)
        if ret != 0:
            print('*** FAILED ***', file=sys.stderr)
            print('LIBDIR: %s' % libdir, file=sys.stderr)
            print('PY_GEN: %s' % genpydir, file=sys.stderr)
            raise Exception("Client subprocess failed, retcode=%d, args: %s" % (ret, ' '.join(cli_args)))
    finally:
        # check that server didn't die, but still attempt cleanup
        cleanup_exc = None
        try:
            ensureServerAlive()
        except Exception as exc:
            cleanup_exc = exc
        extra_sleep = EXTRA_DELAY.get(server_class, 0)
        if extra_sleep > 0 and verbose > 0:
            print('Giving %s (proto=%s,zlib=%s,ssl=%s) an extra %d seconds for child'
                  'processes to terminate via alarm'
                  % (server_class, proto, use_zlib, use_ssl, extra_sleep))
            time.sleep(extra_sleep)
        sig = signal.SIGKILL if platform.system() != 'Windows' else signal.SIGABRT
        try:
            if platform.system() == 'Windows':
                os.kill(serverproc.pid, sig)
            else:
                # POSIX: kill the whole process group to reap forked children.
                os.killpg(serverproc.pid, sig)
        except OSError:
            pass
        serverproc.wait()
        if cleanup_exc:
            raise cleanup_exc


class TestCases(object):
    def __init__(self, genbase, libdir, port, gendirs, servers, verbose):
        self.genbase = genbase
        self.libdir = libdir
        self.port = port
        self.verbose = verbose
        self.gendirs = gendirs
        self.servers = servers

    def default_conf(self):
        return {
            'gendir': self.gendirs[0],
            'server': self.servers[0],
            'proto': PROTOS[0],
            'zlib': False,
            'ssl': False,
        }

    def run(self, conf, test_count):
        with_zlib = conf['zlib']
        with_ssl = conf['ssl']
        try_server = conf['server']
        try_proto = conf['proto']
        genpydir = conf['gendir']
        # skip any servers that don't work with the Zlib transport
        if with_zlib and try_server in SKIP_ZLIB:
            return False
        # skip any servers that don't work with SSL
        if with_ssl and try_server in SKIP_SSL:
            return False
        # Skip SSL issues -> See THRIFT-5901
        if with_ssl:
            print('Skipping \'with_ssl\' tests')
            return False
        if self.verbose > 0:
            print('\nTest run #%d:  (includes %s) Server=%s,  Proto=%s,  zlib=%s,  SSL=%s'
                  % (test_count, genpydir, try_server, try_proto, with_zlib, with_ssl))
        port = self.port if self.port else pick_unused_port()
        runServiceTest(self.libdir, self.genbase, genpydir, try_server, try_proto, port, with_zlib, with_ssl, self.verbose)
        if self.verbose > 0:
            print('OK: Finished (includes %s)  %s / %s proto / zlib=%s / SSL=%s.   %d combinations tested.'
                  % (genpydir, try_server, try_proto, with_zlib, with_ssl, test_count))
        return True

    def test_feature(self, name, values):
        test_count = 0
        conf = self.default_conf()
        for try_server in values:
            conf[name] = try_server
            if self.run(conf, test_count):
                test_count += 1
        return test_count

    def run_all_tests(self):
        test_count = 0
        for try_server in self.servers:
            for genpydir in self.gendirs:
                for try_proto in PROTOS:
                    for with_zlib in (False, True):
                        # skip any servers that don't work with the Zlib transport
                        if with_zlib and try_server in SKIP_ZLIB:
                            continue
                        for with_ssl in (False, True):
                            # skip any servers that don't work with SSL
                            if with_ssl and try_server in SKIP_SSL:
                                continue
                            # Skip SSL issues -> See THRIFT-5901
                            if with_ssl:
                                print('Skipping \'with_ssl\' tests')
                                continue
                            test_count += 1
                            if self.verbose > 0:
                                print('\nTest run #%d:  (includes %s) Server=%s,  Proto=%s,  zlib=%s,  SSL=%s'
                                      % (test_count, genpydir, try_server, try_proto, with_zlib, with_ssl))
                            port = self.port if self.port else pick_unused_port()
                            runServiceTest(self.libdir, self.genbase, genpydir, try_server, try_proto, port, with_zlib, with_ssl, self.verbose)
                            if self.verbose > 0:
                                print('OK: Finished (includes %s)  %s / %s proto / zlib=%s / SSL=%s.   %d combinations tested.'
                                      % (genpydir, try_server, try_proto, with_zlib, with_ssl, test_count))
        return test_count


def main():
    parser = OptionParser()
    parser.add_option('--all', action="store_true", dest='all')
    parser.add_option('--genpydirs', type='string', dest='genpydirs',
                      default='default,slots,oldstyle,no_utf8strings,dynamic,dynamicslots,enum,type_hints',
                      help='directory extensions for generated code, used as suffixes for \"gen-py-*\" added sys.path for individual tests')
    parser.add_option("--port", type="int", dest="port", default=0,
                      help="port number for server to listen on (0 = auto)")
    parser.add_option('-v', '--verbose', action="store_const",
                      dest="verbose", const=2,
                      help="verbose output")
    parser.add_option('-q', '--quiet', action="store_const",
                      dest="verbose", const=0,
                      help="minimal output")
    parser.add_option('-L', '--libdir', dest="libdir", default=local_libpath(),
                      help="directory path that contains Thrift Python library")
    parser.add_option('--gen-base', dest="gen_base", default=SCRIPT_DIR,
                      help="directory path that contains Thrift Python library")
    parser.set_defaults(verbose=1)
    options, args = parser.parse_args()

    generated_dirs = []
    for gp_dir in options.genpydirs.split(','):
        if gp_dir == 'type_hints' and (sys.version_info < (3, 7)):
            print('Skipping \'type_hints\' test since python 3.7 or later is required')
            continue
        generated_dirs.append('gen-py-%s' % (gp_dir))

    # commandline permits a single class name to be specified to override SERVERS=[...]
    servers = default_servers()
    if len(args) == 1:
        if args[0] in servers:
            servers = args
        else:
            print('Unavailable server type "%s", please choose one of: %s' % (args[0], servers))
            sys.exit(0)

    tests = TestCases(options.gen_base, options.libdir, options.port, generated_dirs, servers, options.verbose)

    # run tests without a client/server first
    print('----------------')
    print(' Executing individual test scripts with various generated code directories')
    print(' Directories to be tested: ' + ', '.join(generated_dirs))
    print(' Scripts to be tested: ' + ', '.join(SCRIPTS))
    print('----------------')
    for genpydir in generated_dirs:
        for script in SCRIPTS:
            runScriptTest(options.libdir, options.gen_base, genpydir, script)

    print('----------------')
    print(' Executing Client/Server tests with various generated code directories')
    print(' Servers to be tested: ' + ', '.join(servers))
    print(' Directories to be tested: ' + ', '.join(generated_dirs))
    print(' Protocols to be tested: ' + ', '.join(PROTOS))
    print(' Options to be tested: ZLIB(yes/no), SSL(yes/no)')
    print('----------------')

    if options.all:
        tests.run_all_tests()
    else:
        tests.test_feature('gendir', generated_dirs)
        tests.test_feature('server', servers)
        tests.test_feature('proto', PROTOS)
        tests.test_feature('zlib', [False, True])
        tests.test_feature('ssl', [False, True])


if __name__ == '__main__':
    sys.exit(main())