int grpc_chttp2_unlocking_check_writes(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_global *transport_global,
grpc_chttp2_transport_writing *transport_writing) {
grpc_chttp2_stream_global *stream_global;
grpc_chttp2_stream_writing *stream_writing;
GPR_TIMER_BEGIN("grpc_chttp2_unlocking_check_writes", 0);
/* simple writes are queued to qbuf, and flushed here */
gpr_slice_buffer_swap(&transport_global->qbuf, &transport_writing->outbuf);
GPR_ASSERT(transport_global->qbuf.count == 0);
grpc_chttp2_hpack_compressor_set_max_table_size(
&transport_writing->hpack_compressor,
transport_global->settings[GRPC_PEER_SETTINGS]
[GRPC_CHTTP2_SETTINGS_HEADER_TABLE_SIZE]);
if (transport_global->dirtied_local_settings &&
!transport_global->sent_local_settings) {
gpr_slice_buffer_add(
&transport_writing->outbuf,
grpc_chttp2_settings_create(
transport_global->settings[GRPC_SENT_SETTINGS],
transport_global->settings[GRPC_LOCAL_SETTINGS],
transport_global->force_send_settings, GRPC_CHTTP2_NUM_SETTINGS));
transport_global->force_send_settings = 0;
transport_global->dirtied_local_settings = 0;
transport_global->sent_local_settings = 1;
}
GRPC_CHTTP2_FLOW_MOVE_TRANSPORT("write", transport_writing, outgoing_window,
transport_global, outgoing_window);
if (transport_writing->outgoing_window > 0) {
while (grpc_chttp2_list_pop_stalled_by_transport(transport_global,
&stream_global)) {
grpc_chttp2_become_writable(exec_ctx, transport_global, stream_global,
false, "transport.read_flow_control");
}
}
/* for each grpc_chttp2_stream that's become writable, frame it's data
(according to available window sizes) and add to the output buffer */
while (grpc_chttp2_list_pop_writable_stream(
transport_global, transport_writing, &stream_global, &stream_writing)) {
bool sent_initial_metadata = stream_writing->sent_initial_metadata;
bool become_writable = false;
stream_writing->id = stream_global->id;
stream_writing->read_closed = stream_global->read_closed;
GRPC_CHTTP2_FLOW_MOVE_STREAM("write", transport_writing, stream_writing,
outgoing_window, stream_global,
outgoing_window);
if (!sent_initial_metadata && stream_global->send_initial_metadata) {
stream_writing->send_initial_metadata =
stream_global->send_initial_metadata;
stream_global->send_initial_metadata = NULL;
become_writable = true;
sent_initial_metadata = true;
}
if (sent_initial_metadata) {
if (stream_global->send_message != NULL) {
gpr_slice hdr = gpr_slice_malloc(5);
uint8_t *p = GPR_SLICE_START_PTR(hdr);
uint32_t len = stream_global->send_message->length;
GPR_ASSERT(stream_writing->send_message == NULL);
p[0] = (stream_global->send_message->flags &
GRPC_WRITE_INTERNAL_COMPRESS) != 0;
p[1] = (uint8_t)(len >> 24);
p[2] = (uint8_t)(len >> 16);
p[3] = (uint8_t)(len >> 8);
p[4] = (uint8_t)(len);
gpr_slice_buffer_add(&stream_writing->flow_controlled_buffer, hdr);
if (stream_global->send_message->length > 0) {
stream_writing->send_message = stream_global->send_message;
} else {
stream_writing->send_message = NULL;
}
stream_writing->stream_fetched = 0;
stream_global->send_message = NULL;
}
if ((stream_writing->send_message != NULL ||
stream_writing->flow_controlled_buffer.length > 0) &&
stream_writing->outgoing_window > 0) {
if (transport_writing->outgoing_window > 0) {
become_writable = true;
} else {
grpc_chttp2_list_add_stalled_by_transport(transport_writing,
stream_writing);
}
}
if (stream_global->send_trailing_metadata) {
stream_writing->send_trailing_metadata =
stream_global->send_trailing_metadata;
stream_global->send_trailing_metadata = NULL;
become_writable = true;
}
}
if (!stream_global->read_closed &&
stream_global->unannounced_incoming_window_for_writing > 1024) {
GRPC_CHTTP2_FLOW_MOVE_STREAM("write", transport_global, stream_writing,
announce_window, stream_global,
unannounced_incoming_window_for_writing);
become_writable = true;
}
if (become_writable) {
grpc_chttp2_list_add_writing_stream(transport_writing, stream_writing);
} else {
GRPC_CHTTP2_STREAM_UNREF(exec_ctx, stream_global, "chttp2_writing");
}
}
void grpc_chttp2_hpack_compressor_set_max_usable_size(
grpc_chttp2_hpack_compressor *c, uint32_t max_table_size) {
c->max_usable_size = max_table_size;
grpc_chttp2_hpack_compressor_set_max_table_size(
c, GPR_MIN(c->max_table_size, max_table_size));
}
