test_stream.cpp

/*
    Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "testutil.hpp"

//  ZMTP protocol greeting structure

typedef unsigned char byte;
typedef struct {
    byte signature [10];    //  0xFF 8*0x00 0x7F
    byte version [2];       //  0x03 0x00 for ZMTP/3.0
    byte mechanism [20];    //  "NULL"
    byte as_server;
    byte filler [31];
} zmtp_greeting_t;

#define ZMTP_DEALER  5      //  Socket type constants

//  This is a greeting matching what 0MQ will send us; note the
//  8-byte size is set to 1 for backwards compatibility

static zmtp_greeting_t greeting
    = { { 0xFF, 0, 0, 0, 0, 0, 0, 0, 1, 0x7F }, { 3, 0 }, { 'N', 'U', 'L', 'L'} };

static void
test_stream_to_dealer (void) 
{
    int rc;

    //  Set up our context and sockets
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    //  We'll be using this socket in raw mode
    void *stream = zmq_socket (ctx, ZMQ_STREAM);
    assert (stream);

    int zero = 0;
    rc = zmq_setsockopt (stream, ZMQ_LINGER, &zero, sizeof (zero));
    assert (rc == 0);
    rc = zmq_bind (stream, "tcp://127.0.0.1:5556");
    assert (rc == 0);

    //  We'll be using this socket as the other peer
    void *dealer = zmq_socket (ctx, ZMQ_DEALER);
    assert (dealer);
    rc = zmq_setsockopt (dealer, ZMQ_LINGER, &zero, sizeof (zero));
    assert (rc == 0);
    rc = zmq_connect (dealer, "tcp://localhost:5556");

    //  Send a message on the dealer socket
    rc = zmq_send (dealer, "Hello", 5, 0);
    assert (rc == 5);

    //  First frame is identity
    zmq_msg_t identity;
    rc = zmq_msg_init (&identity);
    assert (rc == 0);
    rc = zmq_msg_recv (&identity, stream, 0);
    assert (rc > 0);
    assert (zmq_msg_more (&identity));

    //  Second frame is greeting signature
    byte buffer [255];
    rc = zmq_recv (stream, buffer, 255, 0);
    assert (rc == 10);
    assert (memcmp (buffer, greeting.signature, 10) == 0);

    //  Send our own protocol greeting
    rc = zmq_msg_send (&identity, stream, ZMQ_SNDMORE);
    assert (rc > 0);
    rc = zmq_send (stream, &greeting, sizeof (greeting), 0);
    assert (rc == sizeof (greeting));

    //  Now we expect the data from the DEALER socket
    //  We want the rest of greeting along with the Ready command
    int bytes_read = 0;
    while (bytes_read < 97) {
        //  First frame is the identity of the connection (each time)
        rc = zmq_msg_recv (&identity, stream, 0);
        assert (rc > 0);
        assert (zmq_msg_more (&identity));
        //  Second frame contains the next chunk of data
        rc = zmq_recv (stream, buffer + bytes_read, 255 - bytes_read, 0);
        assert (rc >= 0);
        bytes_read += rc;
    }

    //  First two bytes are major and minor version numbers.
    assert (buffer [0] == 3);       //  ZMTP/3.0
    assert (buffer [1] == 0);

    //  Mechanism is "NULL"
    assert (memcmp (buffer + 2, "NULL\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 20) == 0);
    assert (memcmp (buffer + 54, "\4\51\5READY", 8) == 0);
    assert (memcmp (buffer + 62, "\13Socket-Type\0\0\0\6DEALER", 22) == 0);
    assert (memcmp (buffer + 84, "\10Identity\0\0\0\0", 13) == 0);

    //  Announce we are ready
    memcpy (buffer, "\4\51\5READY", 8);
    memcpy (buffer + 8, "\13Socket-Type\0\0\0\6ROUTER", 22);
    memcpy (buffer + 30, "\10Identity\0\0\0\0", 13);

    //  Send Ready command
    rc = zmq_msg_send (&identity, stream, ZMQ_SNDMORE);
    assert (rc > 0);
    rc = zmq_send (stream, buffer, 43, 0);
    assert (rc == 43);

    //  Now we expect the data from the DEALER socket
    //  First frame is, again, the identity of the connection
    rc = zmq_msg_recv (&identity, stream, 0);
    assert (rc > 0);
    assert (zmq_msg_more (&identity));

    //  Third frame contains Hello message from DEALER
    rc = zmq_recv (stream, buffer, sizeof buffer, 0);
    assert (rc == 7);

    //  Then we have a 5-byte message "Hello"
    assert (buffer [0] == 0);       //  Flags = 0
    assert (buffer [1] == 5);       //  Size = 5
    assert (memcmp (buffer + 2, "Hello", 5) == 0);

    //  Send "World" back to DEALER
    rc = zmq_msg_send (&identity, stream, ZMQ_SNDMORE);
    assert (rc > 0);
    byte world [] = { 0, 5, 'W', 'o', 'r', 'l', 'd' };
    rc = zmq_send (stream, world, sizeof (world), 0);
    assert (rc == sizeof (world));

    //  Expect response on DEALER socket
    rc = zmq_recv (dealer, buffer, 255, 0);
    assert (rc == 5);
    assert (memcmp (buffer, "World", 5) == 0);

    rc = zmq_close (dealer);
    assert (rc == 0);

    rc = zmq_close (stream);
    assert (rc == 0);

    rc = zmq_ctx_term (ctx);
    assert (rc == 0);
}


static void
test_stream_to_stream (void)
{
    int rc;
    //  Set-up our context and sockets
    void *ctx = zmq_ctx_new ();
    assert (ctx);
    
    void *server = zmq_socket (ctx, ZMQ_STREAM);
    assert (server);
    rc = zmq_bind (server, "tcp://127.0.0.1:9080");
    assert (rc == 0);

    void *client = zmq_socket (ctx, ZMQ_STREAM);
    assert (client);
    rc = zmq_connect (client, "tcp://localhost:9080");
    assert (rc == 0);
    //  It would be less surprising to get an empty message instead
    //  of having to fetch the identity like this [PH 2013/06/27]
    uint8_t id [256];
    size_t id_size = 256;
    rc = zmq_getsockopt (client, ZMQ_IDENTITY, id, &id_size);
    assert (rc == 0);
    
    //  Sent HTTP request on client socket
    //  First frame is server identity
    rc = zmq_send (client, id, id_size, ZMQ_SNDMORE);
    assert (rc == (int) id_size);
    //  Second frame is HTTP GET request
    rc = zmq_send (client, "GET /\n\n", 7, 0);
    assert (rc == 7);
    
    //  Get HTTP request; ID frame and then request
    id_size = zmq_recv (server, id, 256, 0);
    assert (id_size > 0);
    uint8_t buffer [256];
    rc = zmq_recv (server, buffer, 256, 0);
    assert (rc > 0);
    assert (memcmp (buffer, "GET /\n\n", 7) == 0);
    
    //  Send reply back to client
    char http_response [] =
        "HTTP/1.0 200 OK\r\n" 
        "Content-Type: text/plain\r\n" 
        "\r\n" 
        "Hello, World!";
    zmq_send (server, id, id_size, ZMQ_SNDMORE);
    zmq_send (server, http_response, sizeof (http_response), 0);

    //  Get reply at client and check that it's complete
    id_size = zmq_recv (client, id, 256, 0);
    assert (id_size > 0);
    rc = zmq_recv (client, buffer, 256, 0);
    assert (rc == sizeof (http_response));
    assert (memcmp (buffer, http_response, sizeof (http_response)) == 0);
}


int main (void)
{
    setup_test_environment();
    test_stream_to_dealer ();
    test_stream_to_stream ();
}