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zmsg.c
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zmsg.c
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/* =========================================================================
zmsg - working with multipart messages
-------------------------------------------------------------------------
Copyright (c) 1991-2011 iMatix Corporation <www.imatix.com>
Copyright other contributors as noted in the AUTHORS file.
This file is part of CZMQ, the high-level C binding for 0MQ:
http://czmq.zeromq.org.
This 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.
This software 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/>.
=========================================================================
*/
/*
@header
The zmsg class provides methods to send and receive multipart messages
across 0MQ sockets. This class provides a list-like container interface,
with methods to work with the overall container. zmsg_t messages are
composed of zero or more zframe_t frames.
@discuss
@end
*/
#include "../include/czmq_prelude.h"
#include "../include/zctx.h"
#include "../include/zframe.h"
#include "../include/zlist.h"
#include "../include/zsocket.h"
#include "../include/zmsg.h"
// Structure of our class
struct _zmsg_t {
zlist_t *frames; // List of frames
size_t content_size; // Total content size
};
// --------------------------------------------------------------------------
// Constructor
zmsg_t *
zmsg_new (void)
{
zmsg_t
*self;
self = (zmsg_t *) zmalloc (sizeof (zmsg_t));
if (!self)
goto end;
self->frames = zlist_new ();
if (!(self->frames)) {
free (self);
self = NULL;
goto end;
}
end:
return self;
}
// --------------------------------------------------------------------------
// Destructor
void
zmsg_destroy (zmsg_t **self_p)
{
assert (self_p);
if (*self_p) {
zmsg_t *self = *self_p;
while (zlist_size (self->frames) > 0) {
zframe_t *frame = (zframe_t *) zlist_pop (self->frames);
zframe_destroy (&frame);
}
zlist_destroy (&self->frames);
free (self);
*self_p = NULL;
}
}
// --------------------------------------------------------------------------
// Receive message from socket, returns zmsg_t object or NULL if the recv
// was interrupted. Does a blocking recv, if you want to not block then use
// the zloop class or zmq_poll to check for socket input before receiving.
zmsg_t *
zmsg_recv (void *socket)
{
assert (socket);
zmsg_t *self = zmsg_new ();
if (!self)
goto end;
while (1) {
zframe_t *frame = zframe_recv (socket);
if (!frame) {
zmsg_destroy (&self);
break; // Interrupted or terminated
}
if (zmsg_add (self, frame)) {
zmsg_destroy (&self);
break;
}
if (!zframe_more (frame))
break; // Last message frame
}
end:
return self;
}
// --------------------------------------------------------------------------
// Send message to socket, destroy after sending. If the message has no
// frames, sends nothing but destroys the message anyhow. Safe to call
// if zmsg is null.
void
zmsg_send (zmsg_t **self_p, void *socket)
{
assert (self_p);
assert (socket);
zmsg_t *self = *self_p;
if (self) {
zframe_t *frame = (zframe_t *) zlist_pop (self->frames);
while (frame) {
int rc;
rc = zframe_send (&frame, socket,
zlist_size (self->frames)? ZFRAME_MORE: 0);
assert(rc == 0);
frame = (zframe_t *) zlist_pop (self->frames);
}
zmsg_destroy (self_p);
}
}
// --------------------------------------------------------------------------
// Return size of message, i.e. number of frames (0 or more).
size_t
zmsg_size (zmsg_t *self)
{
assert (self);
return zlist_size (self->frames);
}
// --------------------------------------------------------------------------
// Return size of message, i.e. number of frames (0 or more).
size_t
zmsg_content_size (zmsg_t *self)
{
assert (self);
return self->content_size;
}
// --------------------------------------------------------------------------
// Push frame to the front of the message, i.e. before all other frames.
// Message takes ownership of frame, will destroy it when message is sent.
// Returns 0 on success;
int
zmsg_push (zmsg_t *self, zframe_t *frame)
{
assert (self);
assert (frame);
int error = 0;
self->content_size += zframe_size (frame);
error = zlist_push (self->frames, (void *) frame);
return error;
}
// --------------------------------------------------------------------------
// Remove first frame from message, if any. Returns frame, or NULL. Caller
// now owns frame and must destroy it when finished with it.
zframe_t *
zmsg_pop (zmsg_t *self)
{
assert (self);
zframe_t *frame = zlist_pop (self->frames);
if (frame)
self->content_size -= zframe_size (frame);
return frame;
}
// --------------------------------------------------------------------------
// Add frame to the end of the message, i.e. after all other frames.
// Message takes ownership of frame, will destroy it when message is sent.
// Returns 0 on success
int
zmsg_add (zmsg_t *self, zframe_t *frame)
{
assert (self);
assert (frame);
int error = 0;
self->content_size += zframe_size (frame);
error = zlist_append (self->frames, frame);
return error;
}
// --------------------------------------------------------------------------
// Push block of memory to front of message, as a new frame.
int
zmsg_pushmem (zmsg_t *self, const void *src, size_t size)
{
assert (self);
int error = 0;
zframe_t *frame = zframe_new (src, size);
if (frame) {
self->content_size += size;
error = zlist_push (self->frames, frame);
}
else
error = ENOMEM;
return error;
}
// --------------------------------------------------------------------------
// Add block of memory to the end of the message, as a new frame.
int
zmsg_addmem (zmsg_t *self, const void *src, size_t size)
{
assert (self);
int error = 0;
zframe_t *frame = zframe_new (src, size);
if (frame) {
self->content_size += size;
error = zlist_append (self->frames, frame);
}
else
error = ENOMEM;
return error;
}
// --------------------------------------------------------------------------
// Handle the mechanics of pushing the string frame into the list - the list
// function passed in determines how the frame containing the string
// enters the list
static int zmsg_add_str_to_framelist (
int (*list_fxn) (zlist_t *, void *),
zmsg_t *self,
const char *format,
va_list argptr)
{
assert (list_fxn);
assert (self);
assert (format);
int error = 0;
int size = 255 + 1;
char *string = (char *) malloc (size);
if (!string) {
error = ENOMEM;
goto end;
}
int required = vsnprintf (string, size, format, argptr);
if (required >= size) {
char *tmpstring;
size = required + 1;
tmpstring = (char *) realloc (string, size);
if (!tmpstring) {
error = ENOMEM;
goto end;
}
string = tmpstring;
vsnprintf (string, size, format, argptr);
}
self->content_size += strlen (string);
zframe_t *frame = zframe_new (string, strlen (string));
if (!frame) {
error = ENOMEM;
goto end;
}
error = list_fxn (self->frames, frame);
end:
free (string);
return error;
}
// --------------------------------------------------------------------------
// Push string as new frame to front of message
int zmsg_pushstr (zmsg_t *self, const char *format, ...)
{
assert (format);
va_list argptr;
va_start (argptr, format);
int error = zmsg_add_str_to_framelist (&zlist_push, self, format, argptr);
va_end (argptr);
return error;
}
// --------------------------------------------------------------------------
// Push string as new frame to end of message
int
zmsg_addstr (zmsg_t *self, const char *format, ...)
{
assert (format);
va_list argptr;
va_start (argptr, format);
int error = zmsg_add_str_to_framelist (&zlist_append, self, format, argptr);
va_end (argptr);
return error;
}
// --------------------------------------------------------------------------
// Pop frame off front of message, return as fresh string
char *
zmsg_popstr (zmsg_t *self)
{
assert (self);
zframe_t *frame = (zframe_t *) zlist_pop (self->frames);
char *string = NULL;
if (frame) {
self->content_size -= zframe_size (frame);
string = zframe_strdup (frame);
zframe_destroy (&frame);
}
return string;
}
// --------------------------------------------------------------------------
// Push frame plus empty frame to front of message, before first frame.
// Message takes ownership of frame, will destroy it when message is sent.
int
zmsg_wrap (zmsg_t *self, zframe_t *frame)
{
assert (self);
assert (frame);
int error = 0;
error = zmsg_pushmem (self, "", 0);
if (error)
goto end;
error = zmsg_push (self, frame);
if (error) {
// Rewind the empty frame
zmsg_pop (self);
goto end;
}
end:
return error;
}
// --------------------------------------------------------------------------
// Pop frame off front of message, caller now owns frame
// If next frame is empty, pops and destroys that empty frame.
zframe_t *
zmsg_unwrap (zmsg_t *self)
{
assert (self);
zframe_t *frame = zmsg_pop (self);
zframe_t *empty = zmsg_first (self);
if (zframe_size (empty) == 0) {
empty = zmsg_pop (self);
zframe_destroy (&empty);
}
return frame;
}
// --------------------------------------------------------------------------
// Remove specified frame from list, if present. Does not destroy frame.
void
zmsg_remove (zmsg_t *self, zframe_t *frame)
{
assert (self);
self->content_size -= zframe_size (frame);
zlist_remove (self->frames, frame);
}
// --------------------------------------------------------------------------
// Set cursor to first frame in message. Returns frame, or NULL.
zframe_t *
zmsg_first (zmsg_t *self)
{
assert (self);
return (zframe_t *) zlist_first (self->frames);
}
// --------------------------------------------------------------------------
// Return the next frame. If there are no more frames, returns NULL. To move
// to the first frame call zmsg_first(). Advances the cursor.
zframe_t *
zmsg_next (zmsg_t *self)
{
assert (self);
return (zframe_t *) zlist_next (self->frames);
}
// --------------------------------------------------------------------------
// Return the last frame. If there are no frames, returns NULL.
zframe_t *
zmsg_last (zmsg_t *self)
{
assert (self);
zframe_t *frame = (zframe_t *) zlist_first (self->frames);
while (frame) {
zframe_t *next = (zframe_t *) zlist_next (self->frames);
if (!next)
break;
frame = next;
}
return frame;
}
// --------------------------------------------------------------------------
// Save message to an open file, return 0 if OK, else -1.
int
zmsg_save (zmsg_t *self, FILE *file)
{
assert (self);
assert (file);
zframe_t *frame = zmsg_first (self);
while (frame) {
size_t frame_size = zframe_size (frame);
if (fwrite (&frame_size, sizeof (frame_size), 1, file) != 1)
return -1;
if (fwrite (zframe_data (frame), frame_size, 1, file) != 1)
return -1;
frame = zmsg_next (self);
}
return 0;
}
// --------------------------------------------------------------------------
// Load/append an open file into message, create new message if
// null message provided. Return 0 if OK, non-zero otherwise. The
// returned message should be identical to the passed in message on
// error.
//
int
zmsg_load (zmsg_t *self, FILE *file, zmsg_t **return_self)
{
assert (file);
int error = 0;
int frame_count = 0;
int created_msg = 0;
zmsg_t *tmp_msg = NULL;
// NULL out return_self so the caller knows not to use it on failure
*return_self = NULL;
if (self)
tmp_msg = self;
else {
tmp_msg = zmsg_new ();
if (!tmp_msg) {
error = ENOMEM;
goto end;
}
created_msg = 1;
}
while (TRUE) {
size_t frame_size;
clearerr (file);
size_t rc = fread (&frame_size, sizeof (frame_size), 1, file);
if (rc == 1) {
zframe_t *frame = zframe_new (NULL, frame_size);
if (frame) {
if (frame_size) {
clearerr (file);
rc = fread (zframe_data (frame), frame_size, 1, file);
if (rc != 1) {
error = ferror (file);
if (!error)
error = 1;
goto end;
}
}
error = zmsg_add (tmp_msg, frame);
if (error)
goto end;
frame_count++;
}
else {
error = ENOMEM;
goto end; // Unable to allocate frame, quit
}
}
else {
if (feof (file))
goto end;
error = ferror (file);
if (!error)
error = 1;
goto end; // Unable to read properly, quit
}
}
end:
if (error) {
if (tmp_msg) {
// need to rewind the frames we added to the message
// to return the message to its original state
int i = 0;
zframe_t *lastframe;
for(i = 0; i < frame_count; i++) {
lastframe = zmsg_last (tmp_msg);
zmsg_remove (tmp_msg, lastframe);
zframe_destroy (&lastframe);
}
// Only destroy the message if we created it in this function
if (created_msg)
zmsg_destroy (&tmp_msg);
}
}
*return_self = tmp_msg;
return error;
}
// --------------------------------------------------------------------------
// Encode message to a new buffer, return buffer size
// Frame lengths are encoded as 1, 1+2, or 1+4 bytes
// 0..253 bytes octet + data
// 254..64k-1 bytes 0xFE + 2octet + data
// 64k..4Gb-1 bytes 0xFF + 4octet + data
#define ZMSG_SHORT_LEN 0xFE
#define ZMSG_LONG_LEN 0xFF
size_t
zmsg_encode (zmsg_t *self, byte **buffer)
{
assert (self);
// Calculate real size of buffer
size_t buffer_size = 0;
zframe_t *frame = zmsg_first (self);
while (frame) {
size_t frame_size = zframe_size (frame);
if (frame_size < ZMSG_SHORT_LEN)
buffer_size += frame_size + 1;
else
if (frame_size < 0x10000)
buffer_size += frame_size + 3;
else
buffer_size += frame_size + 5;
frame = zmsg_next (self);
}
*buffer = malloc (buffer_size);
// Encode message now
byte *dest = *buffer;
frame = zmsg_first (self);
while (frame) {
size_t frame_size = zframe_size (frame);
if (frame_size < ZMSG_SHORT_LEN) {
*dest++ = (byte) frame_size;
memcpy (dest, zframe_data (frame), frame_size);
dest += frame_size;
}
else
if (frame_size < 0x10000) {
*dest++ = ZMSG_SHORT_LEN;
*dest++ = (frame_size >> 8) & 255;
*dest++ = frame_size & 255;
memcpy (dest, zframe_data (frame), frame_size);
dest += frame_size;
}
else {
*dest++ = ZMSG_LONG_LEN;
*dest++ = (frame_size >> 24) & 255;
*dest++ = (frame_size >> 16) & 255;
*dest++ = (frame_size >> 8) & 255;
*dest++ = frame_size & 255;
memcpy (dest, zframe_data (frame), frame_size);
dest += frame_size;
}
frame = zmsg_next (self);
}
assert ((dest - *buffer) == buffer_size);
return buffer_size;
}
// --------------------------------------------------------------------------
// Decode a buffer into a new message, returns NULL if buffer is not
// properly formatted.
zmsg_t *
zmsg_decode (byte *buffer, size_t buffer_size)
{
zmsg_t *self = zmsg_new ();
if (!self)
goto end;
byte *source = buffer;
byte *limit = buffer + buffer_size;
while (source < limit) {
size_t frame_size = *source++;
if (frame_size == ZMSG_SHORT_LEN) {
if (source > limit - 2) {
zmsg_destroy (&self);
break;
}
frame_size = (source [0] << 8) + source [1];
source += 2;
}
else
if (frame_size == ZMSG_LONG_LEN) {
if (source > limit - 4) {
zmsg_destroy (&self);
break;
}
frame_size = (source [0] << 24)
+ (source [1] << 16)
+ (source [2] << 8)
+ source [3];
source += 4;
}
if (source > limit - frame_size) {
zmsg_destroy (&self);
break;
}
zframe_t *frame = zframe_new (source, frame_size);
if (frame) {
if (zmsg_add (self, frame)) {
zmsg_destroy (&self);
break;
}
source += frame_size;
}
else {
zmsg_destroy (&self);
break;
}
}
end:
return self;
}
// --------------------------------------------------------------------------
// Create copy of message, as new message object
// FIXME: It would be nice if this function returned the actual error
// up the stack rather than just passing back NULL on error.
zmsg_t *
zmsg_dup (zmsg_t *self)
{
assert (self);
int rc = 0;
zmsg_t *copy = NULL;
zframe_t *frame = zmsg_first (self);
if (!frame) {
goto end;
}
copy = zmsg_new ();
if (!copy)
goto end;
while (frame) {
rc = zmsg_addmem (copy, zframe_data (frame), zframe_size (frame));
if (rc) {
zmsg_destroy (©);
goto end;
}
frame = zmsg_next (self);
}
end:
return copy;
}
// --------------------------------------------------------------------------
// Dump message to stderr, for debugging and tracing
// Prints first 10 frames, for larger messages
void
zmsg_dump (zmsg_t *self)
{
fprintf (stderr, "--------------------------------------\n");
if (!self) {
fprintf (stderr, "NULL");
return;
}
zframe_t *frame = zmsg_first (self);
int frame_nbr = 0;
while (frame && frame_nbr++ < 10) {
zframe_print (frame, "");
frame = zmsg_next (self);
}
}
// --------------------------------------------------------------------------
// Selftest
int
zmsg_test (Bool verbose)
{
printf (" * zmsg: ");
int rc = 0;
// @selftest
zctx_t *ctx = zctx_new ();
assert (ctx);
void *output = zsocket_new (ctx, ZMQ_PAIR);
assert (output);
zsocket_bind (output, "inproc://zmsg.test");
void *input = zsocket_new (ctx, ZMQ_PAIR);
assert (input);
zsocket_connect (input, "inproc://zmsg.test");
// Test send and receive of single-frame message
zmsg_t *msg = zmsg_new ();
assert (msg);
zframe_t *frame = zframe_new ("Hello", 5);
assert (frame);
zmsg_push (msg, frame);
assert (zmsg_size (msg) == 1);
assert (zmsg_content_size (msg) == 5);
zmsg_send (&msg, output);
assert (msg == NULL);
msg = zmsg_recv (input);
assert (msg);
assert (zmsg_size (msg) == 1);
assert (zmsg_content_size (msg) == 5);
zmsg_destroy (&msg);
// Test send and receive of multi-frame message
msg = zmsg_new ();
assert (msg);
rc = zmsg_addmem (msg, "Frame0", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame1", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame2", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame3", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame4", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame5", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame6", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame7", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame8", 6);
assert(rc == 0);
rc = zmsg_addmem (msg, "Frame9", 6);
assert(rc == 0);
zmsg_t *copy = zmsg_dup (msg);
assert (copy);
zmsg_send (©, output);
zmsg_send (&msg, output);
copy = zmsg_recv (input);
assert (copy);
assert (zmsg_size (copy) == 10);
assert (zmsg_content_size (copy) == 60);
zmsg_destroy (©);
msg = zmsg_recv (input);
assert (msg);
assert (zmsg_size (msg) == 10);
assert (zmsg_content_size (msg) == 60);
if (verbose)
zmsg_dump (msg);
// Save to a file, read back
FILE *file = fopen ("zmsg.test", "w");
assert (file);
rc = zmsg_save (msg, file);
assert (rc == 0);
fclose (file);
file = fopen ("zmsg.test", "r");
rc = zmsg_save (msg, file);
assert (rc == -1);
fclose (file);
zmsg_destroy (&msg);
file = fopen ("zmsg.test", "r");
rc = zmsg_load (NULL, file, &msg);
assert (rc == 0);
fclose (file);
remove ("zmsg.test");
assert (zmsg_size (msg) == 10);
assert (zmsg_content_size (msg) == 60);
// Remove all frames except first and last
int frame_nbr;
for (frame_nbr = 0; frame_nbr < 8; frame_nbr++) {
zmsg_first (msg);
frame = zmsg_next (msg);
zmsg_remove (msg, frame);
zframe_destroy (&frame);
}
// Test message frame manipulation
assert (zmsg_size (msg) == 2);
assert (zmsg_content_size (msg) == 12);
frame = zframe_new ("Address", 7);
assert (frame);
rc = zmsg_wrap (msg, frame);
assert (rc == 0);
assert (zmsg_size (msg) == 4);
rc = zmsg_addstr (msg, "Body");
assert (rc == 0);
assert (zmsg_size (msg) == 5);
frame = zmsg_unwrap (msg);
zframe_destroy (&frame);
assert (zmsg_size (msg) == 3);
char *body = zmsg_popstr (msg);
assert (streq (body, "Frame0"));
free (body);
zmsg_destroy (&msg);
// Test encoding/decoding
msg = zmsg_new ();
assert (msg);
byte *blank = zmalloc (100000);
assert (blank);
rc = zmsg_addmem (msg, blank, 0);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 1);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 253);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 254);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 255);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 256);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 65535);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 65536);
assert(rc == 0);
rc = zmsg_addmem (msg, blank, 65537);
assert(rc == 0);
free (blank);
assert (zmsg_size (msg) == 9);
byte *buffer;
size_t buffer_size = zmsg_encode (msg, &buffer);
zmsg_destroy (&msg);
msg = zmsg_decode (buffer, buffer_size);
assert (msg);
free (buffer);
zmsg_destroy (&msg);
// Now try methods on an empty message
msg = zmsg_new ();
assert (msg);
assert (zmsg_size (msg) == 0);
assert (zmsg_first (msg) == NULL);
assert (zmsg_next (msg) == NULL);
assert (zmsg_pop (msg) == NULL);
zmsg_destroy (&msg);
zctx_destroy (&ctx);
// @end
printf ("OK\n");
return 0;
}