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"); } }
int grpc_chttp2_unlocking_check_writes( grpc_chttp2_transport_global *transport_global, grpc_chttp2_transport_writing *transport_writing) { grpc_chttp2_stream_global *stream_global; grpc_chttp2_stream_writing *stream_writing; grpc_chttp2_stream_global *first_reinserted_stream = NULL; gpr_uint32 window_delta; /* 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); 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; } /* 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)) { if (stream_global == first_reinserted_stream) { /* prevent infinite loop */ grpc_chttp2_list_add_first_writable_stream(transport_global, stream_global); break; } stream_writing->id = stream_global->id; stream_writing->send_closed = GRPC_DONT_SEND_CLOSED; if (stream_global->outgoing_sopb) { window_delta = grpc_chttp2_preencode(stream_global->outgoing_sopb->ops, &stream_global->outgoing_sopb->nops, GPR_MIN(transport_global->outgoing_window, stream_global->outgoing_window), &stream_writing->sopb); GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT( "write", transport_global, outgoing_window, -(gpr_int64)window_delta); GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global, outgoing_window, -(gpr_int64)window_delta); transport_global->outgoing_window -= window_delta; stream_global->outgoing_window -= window_delta; if (stream_global->write_state == GRPC_WRITE_STATE_QUEUED_CLOSE && stream_global->outgoing_sopb->nops == 0) { if (!transport_global->is_client && !stream_global->read_closed) { stream_writing->send_closed = GRPC_SEND_CLOSED_WITH_RST_STREAM; } else { stream_writing->send_closed = GRPC_SEND_CLOSED; } } if (stream_global->outgoing_window > 0 && stream_global->outgoing_sopb->nops != 0) { grpc_chttp2_list_add_writable_stream(transport_global, stream_global); if (first_reinserted_stream == NULL && transport_global->outgoing_window == 0) { first_reinserted_stream = stream_global; } } } if (!stream_global->read_closed && stream_global->unannounced_incoming_window > 0) { stream_writing->announce_window = stream_global->unannounced_incoming_window; GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global, incoming_window, stream_global->unannounced_incoming_window); GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global, unannounced_incoming_window, -(gpr_int64)stream_global->unannounced_incoming_window); stream_global->incoming_window += stream_global->unannounced_incoming_window; stream_global->unannounced_incoming_window = 0; grpc_chttp2_list_add_incoming_window_updated(transport_global, stream_global); stream_global->writing_now |= GRPC_CHTTP2_WRITING_WINDOW; } if (stream_writing->sopb.nops > 0 || stream_writing->send_closed != GRPC_DONT_SEND_CLOSED) { stream_global->writing_now |= GRPC_CHTTP2_WRITING_DATA; } if (stream_global->writing_now != 0) { grpc_chttp2_list_add_writing_stream(transport_writing, stream_writing); } } /* if the grpc_chttp2_transport is ready to send a window update, do so here also; 3/4 is a magic number that will likely get tuned soon */ if (transport_global->incoming_window < transport_global->connection_window_target * 3 / 4) { window_delta = transport_global->connection_window_target - transport_global->incoming_window; gpr_slice_buffer_add(&transport_writing->outbuf, grpc_chttp2_window_update_create(0, window_delta)); GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT("write", transport_global, incoming_window, window_delta); transport_global->incoming_window += window_delta; } return transport_writing->outbuf.count > 0 || grpc_chttp2_list_have_writing_streams(transport_writing); }