from tests import LimitedTestCase, skip_with_pyevent, main
from eventlet import greenio
from eventlet import debug
from eventlet.green import socket
from eventlet.green.socket import GreenSSLObject
import errno

import eventlet
import os
import sys

def bufsized(sock, size=1):
    """ Resize both send and receive buffers on a socket.
    Useful for testing trampoline.  Returns the socket.
    
    >>> import socket
    >>> sock = bufsized(socket.socket(socket.AF_INET, socket.SOCK_STREAM))
    """
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, size)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, size)
    return sock

def min_buf_size():
    """Return the minimum buffer size that the platform supports."""
    test_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    test_sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 1)
    return test_sock.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)

class TestGreenIo(LimitedTestCase):
    def test_connect_timeout(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(0.1)
        gs = greenio.GreenSocket(s)
        try:
            self.assertRaises(socket.timeout, gs.connect, ('192.0.2.1', 80))
        except socket.error, e:
            # unreachable is also a valid outcome
            if e[0] != errno.EHOSTUNREACH:
                raise

    def test_close_with_makefile(self):
        def accept_close_early(listener):
            # verify that the makefile and the socket are truly independent
            # by closing the socket prior to using the made file
            try:
                conn, addr = listener.accept()
                fd = conn.makefile()
                conn.close()
                fd.write('hello\n')
                fd.close()
                # socket._fileobjects are odd: writes don't check
                # whether the socket is closed or not, and you get an
                # AttributeError during flush if it is closed
                fd.write('a')
                self.assertRaises(Exception, fd.flush)
                self.assertRaises(socket.error, conn.send, 'b')
            finally:
                listener.close()

        def accept_close_late(listener):
            # verify that the makefile and the socket are truly independent
            # by closing the made file and then sending a character
            try:
                conn, addr = listener.accept()
                fd = conn.makefile()
                fd.write('hello')
                fd.close()
                conn.send('\n')
                conn.close()
                fd.write('a')
                self.assertRaises(Exception, fd.flush)
                self.assertRaises(socket.error, conn.send, 'b')
            finally:
                listener.close()
                
        def did_it_work(server):
            client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            client.connect(('127.0.0.1', server.getsockname()[1]))
            fd = client.makefile()
            client.close()
            assert fd.readline() == 'hello\n'    
            assert fd.read() == ''
            fd.close()
            
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        server.bind(('0.0.0.0', 0))
        server.listen(50)
        killer = eventlet.spawn(accept_close_early, server)
        did_it_work(server)
        killer.wait()
        
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        server.bind(('0.0.0.0', 0))
        server.listen(50)
        killer = eventlet.spawn(accept_close_late, server)
        did_it_work(server)
        killer.wait()
    
    def test_del_closes_socket(self):
        def accept_once(listener):
            # delete/overwrite the original conn
            # object, only keeping the file object around
            # closing the file object should close everything
            try:
                conn, addr = listener.accept()
                conn = conn.makefile()
                conn.write('hello\n')
                conn.close()
                conn.write('a')
                self.assertRaises(Exception, conn.flush)
            finally:
                listener.close()
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        server.bind(('127.0.0.1', 0))
        server.listen(50)
        killer = eventlet.spawn(accept_once, server)
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client.connect(('127.0.0.1', server.getsockname()[1]))
        fd = client.makefile()
        client.close()
        assert fd.read() == 'hello\n'    
        assert fd.read() == ''
        
        killer.wait()
     
    def test_full_duplex(self):
        large_data = '*' * 10 * min_buf_size()
        listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        listener.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        listener.bind(('127.0.0.1', 0))
        listener.listen(50)
        bufsized(listener)

        def send_large(sock):
            sock.sendall(large_data)
            
        def read_large(sock):
            result = sock.recv(len(large_data))
            expected = 'hello world'
            while len(result) < len(large_data):
                result += sock.recv(len(large_data))
            self.assertEquals(result, large_data)

        def server():
            (sock, addr) = listener.accept()
            sock = bufsized(sock)
            send_large_coro = eventlet.spawn(send_large, sock)
            eventlet.sleep(0)
            result = sock.recv(10)
            expected = 'hello world'
            while len(result) < len(expected):
                result += sock.recv(10)
            self.assertEquals(result, expected)
            send_large_coro.wait()
                
        server_evt = eventlet.spawn(server)
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client.connect(('127.0.0.1', listener.getsockname()[1]))
        bufsized(client)
        large_evt = eventlet.spawn(read_large, client)
        eventlet.sleep(0)
        client.sendall('hello world')
        server_evt.wait()
        large_evt.wait()
        client.close()
     
    def test_sendall(self):
        # test adapted from Marcus Cavanaugh's email
        # it may legitimately take a while, but will eventually complete
        self.timer.cancel()
        second_bytes = 10
        def test_sendall_impl(many_bytes):
            bufsize = max(many_bytes/15, 2)
            def sender(listener):
                (sock, addr) = listener.accept()
                sock = bufsized(sock, size=bufsize)
                sock.sendall('x'*many_bytes)
                sock.sendall('y'*second_bytes)
            
            listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            listener.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
            listener.bind(("", 0))
            listener.listen(50)
            sender_coro = eventlet.spawn(sender, listener)
            client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            client.connect(('127.0.0.1', listener.getsockname()[1]))
            bufsized(client, size=bufsize)
            total = 0
            while total < many_bytes:
                data = client.recv(min(many_bytes - total, many_bytes/10))
                if data == '':
                    break
                total += len(data)
            
            total2 = 0
            while total < second_bytes:
                data = client.recv(second_bytes)
                if data == '':
                    break
                total2 += len(data)
    
            sender_coro.wait()
            client.close()
        
        for bytes in (1000, 10000, 100000, 1000000):
            test_sendall_impl(bytes)
        
    def test_wrap_socket(self):
        try:
            import ssl
        except ImportError:
            pass  # pre-2.6
        else:
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
            sock.bind(('127.0.0.1', 0))
            sock.listen(50)
            ssl_sock = ssl.wrap_socket(sock)
            
    def test_timeout_and_final_write(self):
        # This test verifies that a write on a socket that we've
        # stopped listening for doesn't result in an incorrect switch
        server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        server.bind(('127.0.0.1', 0))
        server.listen(50)
        bound_port = server.getsockname()[1]
        
        def sender(evt):
            s2, addr = server.accept()
            wrap_wfile = s2.makefile()
            
            eventlet.sleep(0.02)
            wrap_wfile.write('hi')
            s2.close()
            evt.send('sent via event')

        from eventlet import event
        evt = event.Event()
        eventlet.spawn(sender, evt)
        eventlet.sleep(0)  # lets the socket enter accept mode, which
                      # is necessary for connect to succeed on windows
        try:
            # try and get some data off of this pipe
            # but bail before any is sent
            eventlet.exc_after(0.01, eventlet.TimeoutError)
            client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            client.connect(('127.0.0.1', bound_port))
            wrap_rfile = client.makefile()
            _c = wrap_rfile.read(1)
            self.fail()
        except eventlet.TimeoutError:
            pass

        result = evt.wait()
        self.assertEquals(result, 'sent via event')
        server.close()
        client.close()
        

class TestGreenIoLong(LimitedTestCase):
    TEST_TIMEOUT=10  # the test here might take a while depending on the OS
    @skip_with_pyevent
    def test_multiple_readers(self):
        recvsize = 2 * min_buf_size()
        sendsize = 10 * recvsize        
        # test that we can have multiple coroutines reading
        # from the same fd.  We make no guarantees about which one gets which
        # bytes, but they should both get at least some
        def reader(sock, results):
            while True:
                data = sock.recv(recvsize)
                if data == '':
                    break
                results.append(data)
            
        results1 = []
        results2 = []
        listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        listener.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
        listener.bind(('127.0.0.1', 0))
        listener.listen(50)
        def server():
            (sock, addr) = listener.accept()
            sock = bufsized(sock)
            try:
                c1 = eventlet.spawn(reader, sock, results1)
                c2 = eventlet.spawn(reader, sock, results2)
                c1.wait()
                c2.wait()
            finally:
                c1.kill()
                c2.kill()
                sock.close()

        server_coro = eventlet.spawn(server)
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client.connect(('127.0.0.1', listener.getsockname()[1]))
        bufsized(client)
        client.sendall('*' * sendsize)
        client.close()
        server_coro.wait()
        listener.close()
        self.assert_(len(results1) > 0)
        self.assert_(len(results2) > 0)
        
                        
if __name__ == '__main__':
    main()