"""\
@file util.py
@author Bob Ippolito

Copyright (c) 2005-2006, Bob Ippolito
Copyright (c) 2007, Linden Research, Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""

import os
import select
import socket
import errno

try:
    from OpenSSL import SSL
except ImportError:
    class SSL(object):
        class WantWriteError(object):
            pass

        class WantReadError(object):
            pass

        class ZeroReturnError(object):
            pass

        class SysCallError(object):
            pass


def g_log(*args):
    import sys
    import greenlet
    from eventlet.greenlib import greenlet_id
    g_id = greenlet_id()
    if g_id is None:
        if greenlet.getcurrent().parent is None:
            ident = 'greenlet-main'
        else:
            g_id = id(greenlet.getcurrent())
            if g_id < 0:
                g_id += 1 + ((sys.maxint + 1) << 1)
            ident = '%08X' % (g_id,)
    else:
        ident = 'greenlet-%d' % (g_id,)
    print >>sys.stderr, '[%s] %s' % (ident, ' '.join(map(str, args)))


__original_socket__ = socket.socket
__original_gethostbyname__ = socket.gethostbyname
__original_getaddrinfo__ = socket.getaddrinfo

def tcp_socket():
    s = __original_socket__(socket.AF_INET, socket.SOCK_STREAM)
    return s


__original_ssl__ = socket.ssl


def wrap_ssl(sock, certificate=None, private_key=None):
    from OpenSSL import SSL
    from eventlet import greenio, util
    context = SSL.Context(SSL.SSLv23_METHOD)
    print certificate, private_key
    if certificate is not None:
        context.use_certificate_file(certificate)
    if private_key is not None:
        context.use_privatekey_file(private_key)
    context.set_verify(SSL.VERIFY_NONE, lambda *x: True)

    ## TODO only do this on client sockets? how?
    connection = SSL.Connection(context, sock)
    connection.set_connect_state()
    return greenio.GreenSSL(connection)


socket_already_wrapped = False
def wrap_socket_with_coroutine_socket():
    global socket_already_wrapped
    if socket_already_wrapped:
        return

    def new_socket(*args, **kw):
        from eventlet import greenio
        return greenio.GreenSocket(__original_socket__(*args, **kw))
    socket.socket = new_socket

    socket.ssl = wrap_ssl

    from eventlet import tpool
    def new_gethostbyname(*args, **kw):
        return tpool.execute(
            __original_gethostbyname__, *args, **kw)
    socket.gethostbyname = new_gethostbyname

    def new_getaddrinfo(*args, **kw):
        return tpool.execute(
            __original_getaddrinfo__, *args, **kw)
    socket.getaddrinfo = new_getaddrinfo

    socket_already_wrapped = True


__original_fdopen__ = os.fdopen
__original_read__ = os.read
__original_write__ = os.write
__original_waitpid__ = os.waitpid
__original_fork__ = os.fork
## TODO wrappings for popen functions? not really needed since Process object exists?


pipes_already_wrapped = False
def wrap_pipes_with_coroutine_pipes():
    from eventlet import processes ## Make sure the signal handler is installed
    global pipes_already_wrapped
    if pipes_already_wrapped:
        return
    def new_fdopen(*args, **kw):
        from eventlet import greenio
        return greenio.GreenPipe(__original_fdopen__(*args, **kw))
    def new_read(fd, *args, **kw):
        from eventlet import api
        api.trampoline(fd, read=True)
        return __original_read__(fd, *args, **kw)
    def new_write(fd, *args, **kw):
        from eventlet import api
        api.trampoline(fd, write=True)
        return __original_write__(fd, *args, **kw)
    def new_fork(*args, **kwargs):
        pid = __original_fork__
        if pid:
            processes._add_child_pid(pid)
        return  pid
    def new_waitpid(pid, options):
        from eventlet import processes
        evt = processes.CHILD_EVENTS[pid]
        if options == os.WNOHANG:
            if evt.ready():
                return pid, evt.wait()
            return 0, 0
        elif options:
            return __original_waitpid__(pid, result)
        return pid, evt.wait()
    os.fdopen = new_fdopen
    os.read = new_read
    os.write = new_write
    os.fork = new_fork
    os.waitpid = new_waitpid


def socket_bind_and_listen(descriptor, addr=('', 0), backlog=50):
    set_reuse_addr(descriptor)
    descriptor.bind(addr)
    descriptor.listen(backlog)
    return descriptor


def set_reuse_addr(descriptor):
    try:
        descriptor.setsockopt(
            socket.SOL_SOCKET,
            socket.SO_REUSEADDR,
            descriptor.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) | 1,
        )
    except socket.error:
        pass