| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include "src/core/ext/transport/chttp2/transport/context_list.h" |
| #include "src/core/ext/transport/chttp2/transport/internal.h" |
| |
| #include <limits.h> |
| |
| #include <grpc/support/log.h> |
| |
| #include "src/core/lib/debug/stats.h" |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/transport/http2_errors.h" |
| |
| static void add_to_write_list(grpc_chttp2_write_cb** list, |
| grpc_chttp2_write_cb* cb) { |
| cb->next = *list; |
| *list = cb; |
| } |
| |
| static void finish_write_cb(grpc_chttp2_transport* t, grpc_chttp2_stream* s, |
| grpc_chttp2_write_cb* cb, grpc_error* error) { |
| grpc_chttp2_complete_closure_step(t, s, &cb->closure, error, |
| "finish_write_cb"); |
| cb->next = t->write_cb_pool; |
| t->write_cb_pool = cb; |
| } |
| |
| static void maybe_initiate_ping(grpc_chttp2_transport* t) { |
| grpc_chttp2_ping_queue* pq = &t->ping_queue; |
| if (grpc_closure_list_empty(pq->lists[GRPC_CHTTP2_PCL_NEXT])) { |
| /* no ping needed: wait */ |
| return; |
| } |
| if (!grpc_closure_list_empty(pq->lists[GRPC_CHTTP2_PCL_INFLIGHT])) { |
| /* ping already in-flight: wait */ |
| if (grpc_http_trace.enabled() || grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_INFO, "%s: Ping delayed [%p]: already pinging", |
| t->is_client ? "CLIENT" : "SERVER", t->peer_string); |
| } |
| return; |
| } |
| if (t->ping_state.pings_before_data_required == 0 && |
| t->ping_policy.max_pings_without_data != 0) { |
| /* need to receive something of substance before sending a ping again */ |
| if (grpc_http_trace.enabled() || grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_INFO, "%s: Ping delayed [%p]: too many recent pings: %d/%d", |
| t->is_client ? "CLIENT" : "SERVER", t->peer_string, |
| t->ping_state.pings_before_data_required, |
| t->ping_policy.max_pings_without_data); |
| } |
| return; |
| } |
| grpc_millis now = grpc_core::ExecCtx::Get()->Now(); |
| |
| grpc_millis next_allowed_ping_interval = |
| (t->keepalive_permit_without_calls == 0 && |
| grpc_chttp2_stream_map_size(&t->stream_map) == 0) |
| ? 7200 * GPR_MS_PER_SEC |
| : t->ping_policy.min_sent_ping_interval_without_data; |
| grpc_millis next_allowed_ping = |
| t->ping_state.last_ping_sent_time + next_allowed_ping_interval; |
| |
| if (next_allowed_ping > now) { |
| /* not enough elapsed time between successive pings */ |
| if (grpc_http_trace.enabled() || grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_INFO, |
| "%s: Ping delayed [%p]: not enough time elapsed since last ping. " |
| " Last ping %f: Next ping %f: Now %f", |
| t->is_client ? "CLIENT" : "SERVER", t->peer_string, |
| static_cast<double>(t->ping_state.last_ping_sent_time), |
| static_cast<double>(next_allowed_ping), static_cast<double>(now)); |
| } |
| if (!t->ping_state.is_delayed_ping_timer_set) { |
| t->ping_state.is_delayed_ping_timer_set = true; |
| GRPC_CHTTP2_REF_TRANSPORT(t, "retry_initiate_ping_locked"); |
| grpc_timer_init(&t->ping_state.delayed_ping_timer, next_allowed_ping, |
| &t->retry_initiate_ping_locked); |
| } |
| return; |
| } |
| |
| pq->inflight_id = t->ping_ctr; |
| t->ping_ctr++; |
| GRPC_CLOSURE_LIST_SCHED(&pq->lists[GRPC_CHTTP2_PCL_INITIATE]); |
| grpc_closure_list_move(&pq->lists[GRPC_CHTTP2_PCL_NEXT], |
| &pq->lists[GRPC_CHTTP2_PCL_INFLIGHT]); |
| grpc_slice_buffer_add(&t->outbuf, |
| grpc_chttp2_ping_create(false, pq->inflight_id)); |
| GRPC_STATS_INC_HTTP2_PINGS_SENT(); |
| t->ping_state.last_ping_sent_time = now; |
| if (grpc_http_trace.enabled() || grpc_bdp_estimator_trace.enabled()) { |
| gpr_log(GPR_INFO, "%s: Ping sent [%p]: %d/%d", |
| t->is_client ? "CLIENT" : "SERVER", t->peer_string, |
| t->ping_state.pings_before_data_required, |
| t->ping_policy.max_pings_without_data); |
| } |
| t->ping_state.pings_before_data_required -= |
| (t->ping_state.pings_before_data_required != 0); |
| } |
| |
| static bool update_list(grpc_chttp2_transport* t, grpc_chttp2_stream* s, |
| int64_t send_bytes, grpc_chttp2_write_cb** list, |
| int64_t* ctr, grpc_error* error) { |
| bool sched_any = false; |
| grpc_chttp2_write_cb* cb = *list; |
| *list = nullptr; |
| *ctr += send_bytes; |
| while (cb) { |
| grpc_chttp2_write_cb* next = cb->next; |
| if (cb->call_at_byte <= *ctr) { |
| sched_any = true; |
| finish_write_cb(t, s, cb, GRPC_ERROR_REF(error)); |
| } else { |
| add_to_write_list(list, cb); |
| } |
| cb = next; |
| } |
| GRPC_ERROR_UNREF(error); |
| return sched_any; |
| } |
| |
| static void report_stall(grpc_chttp2_transport* t, grpc_chttp2_stream* s, |
| const char* staller) { |
| if (grpc_flowctl_trace.enabled()) { |
| gpr_log( |
| GPR_DEBUG, |
| "%s:%p stream %d moved to stalled list by %s. This is FULLY expected " |
| "to happen in a healthy program that is not seeing flow control stalls." |
| " However, if you know that there are unwanted stalls, here is some " |
| "helpful data: [fc:pending=%" PRIdPTR ":pending-compressed=%" PRIdPTR |
| ":flowed=%" PRId64 ":peer_initwin=%d:t_win=%" PRId64 |
| ":s_win=%d:s_delta=%" PRId64 "]", |
| t->peer_string, t, s->id, staller, s->flow_controlled_buffer.length, |
| s->compressed_data_buffer.length, s->flow_controlled_bytes_flowed, |
| t->settings[GRPC_ACKED_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_INITIAL_WINDOW_SIZE], |
| t->flow_control->remote_window(), |
| static_cast<uint32_t> GPR_MAX( |
| 0, |
| s->flow_control->remote_window_delta() + |
| (int64_t)t->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_INITIAL_WINDOW_SIZE]), |
| s->flow_control->remote_window_delta()); |
| } |
| } |
| |
| static bool stream_ref_if_not_destroyed(gpr_refcount* r) { |
| gpr_atm count; |
| do { |
| count = gpr_atm_acq_load(&r->count); |
| if (count == 0) return false; |
| } while (!gpr_atm_rel_cas(&r->count, count, count + 1)); |
| return true; |
| } |
| |
| /* How many bytes would we like to put on the wire during a single syscall */ |
| static uint32_t target_write_size(grpc_chttp2_transport* t) { |
| return 1024 * 1024; |
| } |
| |
| // Returns true if initial_metadata contains only default headers. |
| static bool is_default_initial_metadata(grpc_metadata_batch* initial_metadata) { |
| return initial_metadata->list.default_count == initial_metadata->list.count; |
| } |
| |
| namespace { |
| class StreamWriteContext; |
| |
| class WriteContext { |
| public: |
| WriteContext(grpc_chttp2_transport* t) : t_(t) { |
| GRPC_STATS_INC_HTTP2_WRITES_BEGUN(); |
| GPR_TIMER_SCOPE("grpc_chttp2_begin_write", 0); |
| } |
| |
| // TODO(ctiller): make this the destructor |
| void FlushStats() { |
| GRPC_STATS_INC_HTTP2_SEND_INITIAL_METADATA_PER_WRITE( |
| initial_metadata_writes_); |
| GRPC_STATS_INC_HTTP2_SEND_MESSAGE_PER_WRITE(message_writes_); |
| GRPC_STATS_INC_HTTP2_SEND_TRAILING_METADATA_PER_WRITE( |
| trailing_metadata_writes_); |
| GRPC_STATS_INC_HTTP2_SEND_FLOWCTL_PER_WRITE(flow_control_writes_); |
| } |
| |
| void FlushSettings() { |
| if (t_->dirtied_local_settings && !t_->sent_local_settings) { |
| grpc_slice_buffer_add( |
| &t_->outbuf, grpc_chttp2_settings_create( |
| t_->settings[GRPC_SENT_SETTINGS], |
| t_->settings[GRPC_LOCAL_SETTINGS], |
| t_->force_send_settings, GRPC_CHTTP2_NUM_SETTINGS)); |
| t_->force_send_settings = false; |
| t_->dirtied_local_settings = false; |
| t_->sent_local_settings = true; |
| GRPC_STATS_INC_HTTP2_SETTINGS_WRITES(); |
| } |
| } |
| |
| void FlushQueuedBuffers() { |
| /* simple writes are queued to qbuf, and flushed here */ |
| grpc_slice_buffer_move_into(&t_->qbuf, &t_->outbuf); |
| GPR_ASSERT(t_->qbuf.count == 0); |
| } |
| |
| void FlushWindowUpdates() { |
| uint32_t transport_announce = |
| t_->flow_control->MaybeSendUpdate(t_->outbuf.count > 0); |
| if (transport_announce) { |
| grpc_transport_one_way_stats throwaway_stats; |
| grpc_slice_buffer_add( |
| &t_->outbuf, grpc_chttp2_window_update_create(0, transport_announce, |
| &throwaway_stats)); |
| ResetPingClock(); |
| } |
| } |
| |
| void FlushPingAcks() { |
| for (size_t i = 0; i < t_->ping_ack_count; i++) { |
| grpc_slice_buffer_add(&t_->outbuf, |
| grpc_chttp2_ping_create(true, t_->ping_acks[i])); |
| } |
| t_->ping_ack_count = 0; |
| } |
| |
| void EnactHpackSettings() { |
| grpc_chttp2_hpack_compressor_set_max_table_size( |
| &t_->hpack_compressor, |
| t_->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_HEADER_TABLE_SIZE]); |
| } |
| |
| void UpdateStreamsNoLongerStalled() { |
| grpc_chttp2_stream* s; |
| while (grpc_chttp2_list_pop_stalled_by_transport(t_, &s)) { |
| if (t_->closed_with_error == GRPC_ERROR_NONE && |
| grpc_chttp2_list_add_writable_stream(t_, s)) { |
| if (!stream_ref_if_not_destroyed(&s->refcount->refs)) { |
| grpc_chttp2_list_remove_writable_stream(t_, s); |
| } |
| } |
| } |
| } |
| |
| grpc_chttp2_stream* NextStream() { |
| if (t_->outbuf.length > target_write_size(t_)) { |
| result_.partial = true; |
| return nullptr; |
| } |
| |
| grpc_chttp2_stream* s; |
| if (!grpc_chttp2_list_pop_writable_stream(t_, &s)) { |
| return nullptr; |
| } |
| |
| return s; |
| } |
| |
| void ResetPingClock() { |
| if (!t_->is_client) { |
| t_->ping_recv_state.last_ping_recv_time = GRPC_MILLIS_INF_PAST; |
| t_->ping_recv_state.ping_strikes = 0; |
| } |
| t_->ping_state.pings_before_data_required = |
| t_->ping_policy.max_pings_without_data; |
| } |
| |
| void IncInitialMetadataWrites() { ++initial_metadata_writes_; } |
| void IncWindowUpdateWrites() { ++flow_control_writes_; } |
| void IncMessageWrites() { ++message_writes_; } |
| void IncTrailingMetadataWrites() { ++trailing_metadata_writes_; } |
| |
| void NoteScheduledResults() { result_.early_results_scheduled = true; } |
| |
| grpc_chttp2_transport* transport() const { return t_; } |
| |
| grpc_chttp2_begin_write_result Result() { |
| result_.writing = t_->outbuf.count > 0; |
| return result_; |
| } |
| |
| private: |
| grpc_chttp2_transport* const t_; |
| |
| /* stats histogram counters: we increment these throughout this function, |
| and at the end publish to the central stats histograms */ |
| int flow_control_writes_ = 0; |
| int initial_metadata_writes_ = 0; |
| int trailing_metadata_writes_ = 0; |
| int message_writes_ = 0; |
| grpc_chttp2_begin_write_result result_ = {false, false, false}; |
| }; |
| |
| class DataSendContext { |
| public: |
| DataSendContext(WriteContext* write_context, grpc_chttp2_transport* t, |
| grpc_chttp2_stream* s) |
| : write_context_(write_context), |
| t_(t), |
| s_(s), |
| sending_bytes_before_(s_->sending_bytes) {} |
| |
| uint32_t stream_remote_window() const { |
| return static_cast<uint32_t> GPR_MAX( |
| 0, s_->flow_control->remote_window_delta() + |
| (int64_t)t_->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_INITIAL_WINDOW_SIZE]); |
| } |
| |
| uint32_t max_outgoing() const { |
| return static_cast<uint32_t> GPR_MIN( |
| t_->settings[GRPC_PEER_SETTINGS][GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE], |
| GPR_MIN(stream_remote_window(), t_->flow_control->remote_window())); |
| } |
| |
| bool AnyOutgoing() const { return max_outgoing() > 0; } |
| |
| void FlushCompressedBytes() { |
| uint32_t send_bytes = static_cast<uint32_t> GPR_MIN( |
| max_outgoing(), s_->compressed_data_buffer.length); |
| bool is_last_data_frame = |
| (send_bytes == s_->compressed_data_buffer.length && |
| s_->flow_controlled_buffer.length == 0 && |
| s_->fetching_send_message == nullptr); |
| if (is_last_data_frame && s_->send_trailing_metadata != nullptr && |
| s_->stream_compression_ctx != nullptr) { |
| if (GPR_UNLIKELY(!grpc_stream_compress( |
| s_->stream_compression_ctx, &s_->flow_controlled_buffer, |
| &s_->compressed_data_buffer, nullptr, MAX_SIZE_T, |
| GRPC_STREAM_COMPRESSION_FLUSH_FINISH))) { |
| gpr_log(GPR_ERROR, "Stream compression failed."); |
| } |
| grpc_stream_compression_context_destroy(s_->stream_compression_ctx); |
| s_->stream_compression_ctx = nullptr; |
| /* After finish, bytes in s->compressed_data_buffer may be |
| * more than max_outgoing. Start another round of the current |
| * while loop so that send_bytes and is_last_data_frame are |
| * recalculated. */ |
| return; |
| } |
| is_last_frame_ = is_last_data_frame && |
| s_->send_trailing_metadata != nullptr && |
| grpc_metadata_batch_is_empty(s_->send_trailing_metadata); |
| grpc_chttp2_encode_data(s_->id, &s_->compressed_data_buffer, send_bytes, |
| is_last_frame_, &s_->stats.outgoing, &t_->outbuf); |
| s_->flow_control->SentData(send_bytes); |
| s_->byte_counter += send_bytes; |
| if (s_->compressed_data_buffer.length == 0) { |
| s_->sending_bytes += s_->uncompressed_data_size; |
| } |
| } |
| |
| void CompressMoreBytes() { |
| if (s_->stream_compression_ctx == nullptr) { |
| s_->stream_compression_ctx = |
| grpc_stream_compression_context_create(s_->stream_compression_method); |
| } |
| s_->uncompressed_data_size = s_->flow_controlled_buffer.length; |
| if (GPR_UNLIKELY(!grpc_stream_compress( |
| s_->stream_compression_ctx, &s_->flow_controlled_buffer, |
| &s_->compressed_data_buffer, nullptr, MAX_SIZE_T, |
| GRPC_STREAM_COMPRESSION_FLUSH_SYNC))) { |
| gpr_log(GPR_ERROR, "Stream compression failed."); |
| } |
| } |
| |
| bool is_last_frame() const { return is_last_frame_; } |
| |
| void CallCallbacks() { |
| if (update_list( |
| t_, s_, |
| static_cast<int64_t>(s_->sending_bytes - sending_bytes_before_), |
| &s_->on_flow_controlled_cbs, &s_->flow_controlled_bytes_flowed, |
| GRPC_ERROR_NONE)) { |
| write_context_->NoteScheduledResults(); |
| } |
| } |
| |
| private: |
| WriteContext* write_context_; |
| grpc_chttp2_transport* t_; |
| grpc_chttp2_stream* s_; |
| const size_t sending_bytes_before_; |
| bool is_last_frame_ = false; |
| }; |
| |
| class StreamWriteContext { |
| public: |
| StreamWriteContext(WriteContext* write_context, grpc_chttp2_stream* s) |
| : write_context_(write_context), t_(write_context->transport()), s_(s) { |
| GRPC_CHTTP2_IF_TRACING( |
| gpr_log(GPR_INFO, "W:%p %s[%d] im-(sent,send)=(%d,%d) announce=%d", t_, |
| t_->is_client ? "CLIENT" : "SERVER", s->id, |
| s->sent_initial_metadata, s->send_initial_metadata != nullptr, |
| (int)(s->flow_control->local_window_delta() - |
| s->flow_control->announced_window_delta()))); |
| } |
| |
| void FlushInitialMetadata() { |
| /* send initial metadata if it's available */ |
| if (s_->sent_initial_metadata) return; |
| if (s_->send_initial_metadata == nullptr) return; |
| |
| // We skip this on the server side if there is no custom initial |
| // metadata, there are no messages to send, and we are also sending |
| // trailing metadata. This results in a Trailers-Only response, |
| // which is required for retries, as per: |
| // https://github.com/grpc/proposal/blob/master/A6-client-retries.md#when-retries-are-valid |
| if (!t_->is_client && s_->fetching_send_message == nullptr && |
| s_->flow_controlled_buffer.length == 0 && |
| s_->compressed_data_buffer.length == 0 && |
| s_->send_trailing_metadata != nullptr && |
| is_default_initial_metadata(s_->send_initial_metadata)) { |
| ConvertInitialMetadataToTrailingMetadata(); |
| } else { |
| grpc_encode_header_options hopt = { |
| s_->id, // stream_id |
| false, // is_eof |
| t_->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_GRPC_ALLOW_TRUE_BINARY_METADATA] != |
| 0, // use_true_binary_metadata |
| t_->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE], // max_frame_size |
| &s_->stats.outgoing // stats |
| }; |
| grpc_chttp2_encode_header(&t_->hpack_compressor, nullptr, 0, |
| s_->send_initial_metadata, &hopt, &t_->outbuf); |
| write_context_->ResetPingClock(); |
| write_context_->IncInitialMetadataWrites(); |
| } |
| |
| s_->send_initial_metadata = nullptr; |
| s_->sent_initial_metadata = true; |
| write_context_->NoteScheduledResults(); |
| grpc_chttp2_complete_closure_step( |
| t_, s_, &s_->send_initial_metadata_finished, GRPC_ERROR_NONE, |
| "send_initial_metadata_finished"); |
| } |
| |
| void FlushWindowUpdates() { |
| /* send any window updates */ |
| const uint32_t stream_announce = s_->flow_control->MaybeSendUpdate(); |
| if (stream_announce == 0) return; |
| |
| grpc_slice_buffer_add( |
| &t_->outbuf, grpc_chttp2_window_update_create(s_->id, stream_announce, |
| &s_->stats.outgoing)); |
| write_context_->ResetPingClock(); |
| write_context_->IncWindowUpdateWrites(); |
| } |
| |
| void FlushData() { |
| if (!s_->sent_initial_metadata) return; |
| |
| if (s_->flow_controlled_buffer.length == 0 && |
| s_->compressed_data_buffer.length == 0) { |
| return; // early out: nothing to do |
| } |
| |
| DataSendContext data_send_context(write_context_, t_, s_); |
| |
| if (!data_send_context.AnyOutgoing()) { |
| if (t_->flow_control->remote_window() <= 0) { |
| report_stall(t_, s_, "transport"); |
| grpc_chttp2_list_add_stalled_by_transport(t_, s_); |
| } else if (data_send_context.stream_remote_window() <= 0) { |
| report_stall(t_, s_, "stream"); |
| grpc_chttp2_list_add_stalled_by_stream(t_, s_); |
| } |
| return; // early out: nothing to do |
| } |
| |
| while ((s_->flow_controlled_buffer.length > 0 || |
| s_->compressed_data_buffer.length > 0) && |
| data_send_context.max_outgoing() > 0) { |
| if (s_->compressed_data_buffer.length > 0) { |
| data_send_context.FlushCompressedBytes(); |
| } else { |
| data_send_context.CompressMoreBytes(); |
| } |
| } |
| if (s_->traced && grpc_endpoint_can_track_err(t_->ep)) { |
| grpc_core::ContextList::Append(&t_->cl, s_); |
| } |
| write_context_->ResetPingClock(); |
| if (data_send_context.is_last_frame()) { |
| SentLastFrame(); |
| } |
| data_send_context.CallCallbacks(); |
| stream_became_writable_ = true; |
| if (s_->flow_controlled_buffer.length > 0 || |
| s_->compressed_data_buffer.length > 0) { |
| GRPC_CHTTP2_STREAM_REF(s_, "chttp2_writing:fork"); |
| grpc_chttp2_list_add_writable_stream(t_, s_); |
| } |
| write_context_->IncMessageWrites(); |
| } |
| |
| void FlushTrailingMetadata() { |
| if (!s_->sent_initial_metadata) return; |
| |
| if (s_->send_trailing_metadata == nullptr) return; |
| if (s_->fetching_send_message != nullptr) return; |
| if (s_->flow_controlled_buffer.length != 0) return; |
| if (s_->compressed_data_buffer.length != 0) return; |
| |
| GRPC_CHTTP2_IF_TRACING(gpr_log(GPR_INFO, "sending trailing_metadata")); |
| if (grpc_metadata_batch_is_empty(s_->send_trailing_metadata)) { |
| grpc_chttp2_encode_data(s_->id, &s_->flow_controlled_buffer, 0, true, |
| &s_->stats.outgoing, &t_->outbuf); |
| } else { |
| grpc_encode_header_options hopt = { |
| s_->id, true, |
| t_->settings[GRPC_PEER_SETTINGS] |
| [GRPC_CHTTP2_SETTINGS_GRPC_ALLOW_TRUE_BINARY_METADATA] != |
| 0, |
| |
| t_->settings[GRPC_PEER_SETTINGS][GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE], |
| &s_->stats.outgoing}; |
| grpc_chttp2_encode_header(&t_->hpack_compressor, |
| extra_headers_for_trailing_metadata_, |
| num_extra_headers_for_trailing_metadata_, |
| s_->send_trailing_metadata, &hopt, &t_->outbuf); |
| } |
| write_context_->IncTrailingMetadataWrites(); |
| write_context_->ResetPingClock(); |
| SentLastFrame(); |
| |
| write_context_->NoteScheduledResults(); |
| grpc_chttp2_complete_closure_step( |
| t_, s_, &s_->send_trailing_metadata_finished, GRPC_ERROR_NONE, |
| "send_trailing_metadata_finished"); |
| } |
| |
| bool stream_became_writable() { return stream_became_writable_; } |
| |
| private: |
| void ConvertInitialMetadataToTrailingMetadata() { |
| GRPC_CHTTP2_IF_TRACING( |
| gpr_log(GPR_INFO, "not sending initial_metadata (Trailers-Only)")); |
| // When sending Trailers-Only, we need to move the :status and |
| // content-type headers to the trailers. |
| if (s_->send_initial_metadata->idx.named.status != nullptr) { |
| extra_headers_for_trailing_metadata_ |
| [num_extra_headers_for_trailing_metadata_++] = |
| &s_->send_initial_metadata->idx.named.status->md; |
| } |
| if (s_->send_initial_metadata->idx.named.content_type != nullptr) { |
| extra_headers_for_trailing_metadata_ |
| [num_extra_headers_for_trailing_metadata_++] = |
| &s_->send_initial_metadata->idx.named.content_type->md; |
| } |
| } |
| |
| void SentLastFrame() { |
| s_->send_trailing_metadata = nullptr; |
| s_->sent_trailing_metadata = true; |
| s_->eos_sent = true; |
| |
| if (!t_->is_client && !s_->read_closed) { |
| grpc_slice_buffer_add( |
| &t_->outbuf, grpc_chttp2_rst_stream_create( |
| s_->id, GRPC_HTTP2_NO_ERROR, &s_->stats.outgoing)); |
| } |
| grpc_chttp2_mark_stream_closed(t_, s_, !t_->is_client, true, |
| GRPC_ERROR_NONE); |
| } |
| |
| WriteContext* const write_context_; |
| grpc_chttp2_transport* const t_; |
| grpc_chttp2_stream* const s_; |
| bool stream_became_writable_ = false; |
| grpc_mdelem* extra_headers_for_trailing_metadata_[2]; |
| size_t num_extra_headers_for_trailing_metadata_ = 0; |
| }; |
| } // namespace |
| |
| grpc_chttp2_begin_write_result grpc_chttp2_begin_write( |
| grpc_chttp2_transport* t) { |
| WriteContext ctx(t); |
| ctx.FlushSettings(); |
| ctx.FlushPingAcks(); |
| ctx.FlushQueuedBuffers(); |
| ctx.EnactHpackSettings(); |
| |
| if (t->flow_control->remote_window() > 0) { |
| ctx.UpdateStreamsNoLongerStalled(); |
| } |
| |
| /* 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_stream* s = ctx.NextStream()) { |
| StreamWriteContext stream_ctx(&ctx, s); |
| stream_ctx.FlushInitialMetadata(); |
| stream_ctx.FlushWindowUpdates(); |
| stream_ctx.FlushData(); |
| stream_ctx.FlushTrailingMetadata(); |
| |
| if (stream_ctx.stream_became_writable()) { |
| if (!grpc_chttp2_list_add_writing_stream(t, s)) { |
| /* already in writing list: drop ref */ |
| GRPC_CHTTP2_STREAM_UNREF(s, "chttp2_writing:already_writing"); |
| } else { |
| /* ref will be dropped at end of write */ |
| } |
| } else { |
| GRPC_CHTTP2_STREAM_UNREF(s, "chttp2_writing:no_write"); |
| } |
| } |
| |
| ctx.FlushWindowUpdates(); |
| |
| maybe_initiate_ping(t); |
| |
| return ctx.Result(); |
| } |
| |
| void grpc_chttp2_end_write(grpc_chttp2_transport* t, grpc_error* error) { |
| GPR_TIMER_SCOPE("grpc_chttp2_end_write", 0); |
| grpc_chttp2_stream* s; |
| |
| if (t->channelz_socket != nullptr) { |
| t->channelz_socket->RecordMessagesSent(t->num_messages_in_next_write); |
| } |
| t->num_messages_in_next_write = 0; |
| |
| while (grpc_chttp2_list_pop_writing_stream(t, &s)) { |
| if (s->sending_bytes != 0) { |
| update_list(t, s, static_cast<int64_t>(s->sending_bytes), |
| &s->on_write_finished_cbs, &s->flow_controlled_bytes_written, |
| GRPC_ERROR_REF(error)); |
| s->sending_bytes = 0; |
| } |
| GRPC_CHTTP2_STREAM_UNREF(s, "chttp2_writing:end"); |
| } |
| grpc_slice_buffer_reset_and_unref_internal(&t->outbuf); |
| GRPC_ERROR_UNREF(error); |
| } |
