int pn_post_frame(pn_dispatcher_t *disp, uint16_t ch, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
pn_data_clear(disp->output_args);
int err = pn_data_vfill(disp->output_args, fmt, ap);
va_end(ap);
if (err) {
pn_transport_logf(disp->transport,
"error posting frame: %s, %s: %s", fmt, pn_code(err),
pn_error_text(pn_data_error(disp->output_args)));
return PN_ERR;
}
pn_do_trace(disp, ch, OUT, disp->output_args, disp->output_payload, disp->output_size);
encode_performatives:
pn_buffer_clear( disp->frame );
pn_bytes_t buf = pn_buffer_bytes( disp->frame );
buf.size = pn_buffer_available( disp->frame );
ssize_t wr = pn_data_encode( disp->output_args, buf.start, buf.size );
if (wr < 0) {
if (wr == PN_OVERFLOW) {
pn_buffer_ensure( disp->frame, pn_buffer_available( disp->frame ) * 2 );
goto encode_performatives;
}
pn_transport_logf(disp->transport,
"error posting frame: %s", pn_code(wr));
return PN_ERR;
}
pn_frame_t frame = {disp->frame_type};
frame.channel = ch;
frame.payload = buf.start;
frame.size = wr;
size_t n;
while (!(n = pn_write_frame(disp->output + disp->available,
disp->capacity - disp->available, frame))) {
disp->capacity *= 2;
disp->output = (char *) realloc(disp->output, disp->capacity);
}
disp->output_frames_ct += 1;
if (disp->trace & PN_TRACE_RAW) {
pn_string_set(disp->scratch, "RAW: \"");
pn_quote(disp->scratch, disp->output + disp->available, n);
pn_string_addf(disp->scratch, "\"");
pn_transport_log(disp->transport, pn_string_get(disp->scratch));
}
disp->available += n;
return 0;
}
size_t pn_buffer_head_space(pn_buffer_t *buf)
{
if (pn_buffer_wrapped(buf)) {
return pn_buffer_available(buf);
} else {
return pn_buffer_head(buf);
}
}
size_t pn_buffer_tail_space(pn_buffer_t *buf)
{
if (pn_buffer_wrapped(buf)) {
return pn_buffer_available(buf);
} else {
return buf->capacity - pn_buffer_tail(buf);
}
}
int pn_buffer_ensure(pn_buffer_t *buf, size_t size)
{
size_t old_capacity = buf->capacity;
size_t old_head = pn_buffer_head(buf);
bool wrapped = pn_buffer_wrapped(buf);
while (pn_buffer_available(buf) < size) {
buf->capacity = 2*(buf->capacity ? buf->capacity : 16);
}
if (buf->capacity != old_capacity) {
buf->bytes = (char *) realloc(buf->bytes, buf->capacity);
if (wrapped) {
size_t n = old_capacity - old_head;
memmove(buf->bytes + buf->capacity - n, buf->bytes + old_head, n);
buf->start = buf->capacity - n;
}
}
return 0;
}
int pn_post_transfer_frame(pn_dispatcher_t *disp, uint16_t ch,
uint32_t handle,
pn_sequence_t id,
const pn_bytes_t *tag,
uint32_t message_format,
bool settled,
bool more,
pn_sequence_t frame_limit)
{
bool more_flag = more;
int framecount = 0;
// create preformatives, assuming 'more' flag need not change
compute_performatives:
pn_data_clear(disp->output_args);
int err = pn_data_fill(disp->output_args, "DL[IIzIoo]", TRANSFER,
handle, id, tag->size, tag->start,
message_format,
settled, more_flag);
if (err) {
pn_transport_logf(disp->transport,
"error posting transfer frame: %s: %s", pn_code(err),
pn_error_text(pn_data_error(disp->output_args)));
return PN_ERR;
}
do { // send as many frames as possible without changing the 'more' flag...
encode_performatives:
pn_buffer_clear( disp->frame );
pn_bytes_t buf = pn_buffer_bytes( disp->frame );
buf.size = pn_buffer_available( disp->frame );
ssize_t wr = pn_data_encode(disp->output_args, buf.start, buf.size);
if (wr < 0) {
if (wr == PN_OVERFLOW) {
pn_buffer_ensure( disp->frame, pn_buffer_available( disp->frame ) * 2 );
goto encode_performatives;
}
pn_transport_logf(disp->transport, "error posting frame: %s", pn_code(wr));
return PN_ERR;
}
buf.size = wr;
// check if we need to break up the outbound frame
size_t available = disp->output_size;
if (disp->remote_max_frame) {
if ((available + buf.size) > disp->remote_max_frame - 8) {
available = disp->remote_max_frame - 8 - buf.size;
if (more_flag == false) {
more_flag = true;
goto compute_performatives; // deal with flag change
}
} else if (more_flag == true && more == false) {
// caller has no more, and this is the last frame
more_flag = false;
goto compute_performatives;
}
}
if (pn_buffer_available( disp->frame ) < (available + buf.size)) {
// not enough room for payload - try again...
pn_buffer_ensure( disp->frame, available + buf.size );
goto encode_performatives;
}
pn_do_trace(disp, ch, OUT, disp->output_args, disp->output_payload, available);
memmove( buf.start + buf.size, disp->output_payload, available);
disp->output_payload += available;
disp->output_size -= available;
buf.size += available;
pn_frame_t frame = {disp->frame_type};
frame.channel = ch;
frame.payload = buf.start;
frame.size = buf.size;
size_t n;
while (!(n = pn_write_frame(disp->output + disp->available,
disp->capacity - disp->available, frame))) {
disp->capacity *= 2;
disp->output = (char *) realloc(disp->output, disp->capacity);
}
disp->output_frames_ct += 1;
framecount++;
if (disp->trace & PN_TRACE_RAW) {
pn_string_set(disp->scratch, "RAW: \"");
pn_quote(disp->scratch, disp->output + disp->available, n);
pn_string_addf(disp->scratch, "\"");
pn_transport_log(disp->transport, pn_string_get(disp->scratch));
}
disp->available += n;
} while (disp->output_size > 0 && framecount < frame_limit);
disp->output_payload = NULL;
return framecount;
}
