Alexei Frolov | 22ee114 | 2022-02-03 13:59:01 -0800 | [diff] [blame] | 1 | // Copyright 2022 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
| 15 | #define PW_LOG_MODULE_NAME "TRN" |
| 16 | |
| 17 | #include "pw_transfer/transfer_thread.h" |
| 18 | |
| 19 | #include "pw_assert/check.h" |
| 20 | #include "pw_log/log.h" |
| 21 | #include "pw_transfer/internal/chunk.h" |
| 22 | |
Wyatt Hepler | 70a6210 | 2022-02-11 15:14:35 -0800 | [diff] [blame] | 23 | PW_MODIFY_DIAGNOSTICS_PUSH(); |
| 24 | PW_MODIFY_DIAGNOSTIC(ignored, "-Wmissing-field-initializers"); |
| 25 | |
Alexei Frolov | 22ee114 | 2022-02-03 13:59:01 -0800 | [diff] [blame] | 26 | namespace pw::transfer::internal { |
| 27 | |
| 28 | void TransferThread::Terminate() { |
| 29 | next_event_ownership_.acquire(); |
| 30 | next_event_.type = EventType::kTerminate; |
| 31 | event_notification_.release(); |
| 32 | } |
| 33 | |
| 34 | void TransferThread::SimulateTimeout(EventType type, uint32_t transfer_id) { |
| 35 | next_event_ownership_.acquire(); |
| 36 | |
| 37 | next_event_.type = type; |
| 38 | next_event_.chunk = {}; |
| 39 | next_event_.chunk.transfer_id = transfer_id; |
| 40 | |
| 41 | event_notification_.release(); |
| 42 | |
| 43 | WaitUntilEventIsProcessed(); |
| 44 | } |
| 45 | |
| 46 | void TransferThread::Run() { |
| 47 | // Next event starts freed. |
| 48 | next_event_ownership_.release(); |
| 49 | |
| 50 | while (true) { |
| 51 | if (event_notification_.try_acquire_until(GetNextTransferTimeout())) { |
| 52 | if (next_event_.type == EventType::kTerminate) { |
| 53 | return; |
| 54 | } |
| 55 | |
| 56 | HandleEvent(next_event_); |
| 57 | |
| 58 | // Finished processing the event. Allow the next_event struct to be |
| 59 | // overwritten. |
| 60 | next_event_ownership_.release(); |
| 61 | } |
| 62 | |
| 63 | // Regardless of whether an event was received or not, check for any |
| 64 | // transfers which have timed out and process them if so. |
| 65 | for (Context& context : client_transfers_) { |
| 66 | if (context.timed_out()) { |
| 67 | context.HandleEvent({.type = EventType::kClientTimeout}); |
| 68 | } |
| 69 | } |
| 70 | for (Context& context : server_transfers_) { |
| 71 | if (context.timed_out()) { |
| 72 | context.HandleEvent({.type = EventType::kServerTimeout}); |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | chrono::SystemClock::time_point TransferThread::GetNextTransferTimeout() const { |
| 79 | chrono::SystemClock::time_point timeout = |
| 80 | chrono::SystemClock::TimePointAfterAtLeast(kMaxTimeout); |
| 81 | |
| 82 | for (Context& context : client_transfers_) { |
| 83 | auto ctx_timeout = context.timeout(); |
| 84 | if (ctx_timeout.has_value() && ctx_timeout.value() < timeout) { |
| 85 | timeout = ctx_timeout.value(); |
| 86 | } |
| 87 | } |
| 88 | for (Context& context : server_transfers_) { |
| 89 | auto ctx_timeout = context.timeout(); |
| 90 | if (ctx_timeout.has_value() && ctx_timeout.value() < timeout) { |
| 91 | timeout = ctx_timeout.value(); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | return timeout; |
| 96 | } |
| 97 | |
| 98 | void TransferThread::StartTransfer(TransferType type, |
| 99 | uint32_t transfer_id, |
| 100 | uint32_t handler_id, |
| 101 | stream::Stream* stream, |
| 102 | const TransferParameters& max_parameters, |
| 103 | Function<void(Status)>&& on_completion, |
| 104 | chrono::SystemClock::duration timeout, |
| 105 | uint8_t max_retries) { |
| 106 | // Block until the last event has been processed. |
| 107 | next_event_ownership_.acquire(); |
| 108 | |
| 109 | bool is_client_transfer = stream != nullptr; |
| 110 | |
| 111 | next_event_.type = is_client_transfer ? EventType::kNewClientTransfer |
| 112 | : EventType::kNewServerTransfer; |
| 113 | next_event_.new_transfer = { |
| 114 | .type = type, |
| 115 | .transfer_id = transfer_id, |
| 116 | .handler_id = handler_id, |
| 117 | .max_parameters = &max_parameters, |
| 118 | .timeout = timeout, |
| 119 | .max_retries = max_retries, |
| 120 | .transfer_thread = this, |
| 121 | }; |
| 122 | |
| 123 | staged_on_completion_ = std::move(on_completion); |
| 124 | |
| 125 | // The transfer is initialized with either a stream (client-side) or a handler |
| 126 | // (server-side). If no stream is provided, try to find a registered handler |
| 127 | // with the specified ID. |
| 128 | if (is_client_transfer) { |
| 129 | next_event_.new_transfer.stream = stream; |
| 130 | next_event_.new_transfer.rpc_writer = &static_cast<rpc::Writer&>( |
| 131 | type == TransferType::kTransmit ? client_write_stream_ |
| 132 | : client_read_stream_); |
| 133 | } else { |
| 134 | auto handler = std::find_if(handlers_.begin(), |
| 135 | handlers_.end(), |
| 136 | [&](auto& h) { return h.id() == handler_id; }); |
| 137 | if (handler != handlers_.end()) { |
| 138 | next_event_.new_transfer.handler = &*handler; |
| 139 | next_event_.new_transfer.rpc_writer = &static_cast<rpc::Writer&>( |
| 140 | type == TransferType::kTransmit ? server_read_stream_ |
| 141 | : server_write_stream_); |
| 142 | } else { |
| 143 | // No handler exists for the transfer: return a NOT_FOUND. |
| 144 | next_event_.type = EventType::kSendStatusChunk; |
| 145 | next_event_.send_status_chunk = { |
| 146 | .transfer_id = transfer_id, |
| 147 | .status = Status::NotFound().code(), |
| 148 | .stream = type == TransferType::kTransmit |
| 149 | ? TransferStream::kServerRead |
| 150 | : TransferStream::kServerWrite, |
| 151 | }; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | event_notification_.release(); |
| 156 | } |
| 157 | |
| 158 | void TransferThread::ProcessChunk(EventType type, ConstByteSpan chunk) { |
| 159 | // If this assert is hit, there is a bug in the transfer implementation. |
| 160 | // Contexts' max_chunk_size_bytes fields should be set based on the size of |
| 161 | // chunk_buffer_. |
| 162 | PW_CHECK(chunk.size() <= chunk_buffer_.size(), |
| 163 | "Transfer received a larger chunk than it can handle."); |
| 164 | |
| 165 | Result<uint32_t> transfer_id = ExtractTransferId(chunk); |
| 166 | if (!transfer_id.ok()) { |
| 167 | PW_LOG_ERROR("Received a malformed chunk without a transfer ID"); |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | // Block until the last event has been processed. |
| 172 | next_event_ownership_.acquire(); |
| 173 | |
| 174 | std::memcpy(chunk_buffer_.data(), chunk.data(), chunk.size()); |
| 175 | |
| 176 | next_event_.type = type; |
| 177 | next_event_.chunk = { |
| 178 | .transfer_id = *transfer_id, |
| 179 | .data = chunk_buffer_.data(), |
| 180 | .size = chunk.size(), |
| 181 | }; |
| 182 | |
| 183 | event_notification_.release(); |
| 184 | } |
| 185 | |
| 186 | void TransferThread::SetClientStream(TransferStream type, |
| 187 | rpc::RawClientReaderWriter& stream) { |
| 188 | // Block until the last event has been processed. |
| 189 | next_event_ownership_.acquire(); |
| 190 | |
| 191 | next_event_.type = EventType::kSetTransferStream; |
| 192 | next_event_.set_transfer_stream = type; |
| 193 | staged_client_stream_ = std::move(stream); |
| 194 | |
| 195 | event_notification_.release(); |
| 196 | } |
| 197 | |
| 198 | void TransferThread::SetServerStream(TransferStream type, |
| 199 | rpc::RawServerReaderWriter& stream) { |
| 200 | // Block until the last event has been processed. |
| 201 | next_event_ownership_.acquire(); |
| 202 | |
| 203 | next_event_.type = EventType::kSetTransferStream; |
| 204 | next_event_.set_transfer_stream = type; |
| 205 | staged_server_stream_ = std::move(stream); |
| 206 | |
| 207 | event_notification_.release(); |
| 208 | } |
| 209 | |
| 210 | void TransferThread::TransferHandlerEvent(EventType type, |
| 211 | internal::Handler& handler) { |
| 212 | // Block until the last event has been processed. |
| 213 | next_event_ownership_.acquire(); |
| 214 | |
| 215 | next_event_.type = type; |
| 216 | if (type == EventType::kAddTransferHandler) { |
| 217 | next_event_.add_transfer_handler = &handler; |
| 218 | } else { |
| 219 | next_event_.remove_transfer_handler = &handler; |
| 220 | } |
| 221 | |
| 222 | event_notification_.release(); |
| 223 | } |
| 224 | |
| 225 | void TransferThread::HandleEvent(const internal::Event& event) { |
| 226 | switch (event.type) { |
| 227 | case EventType::kSendStatusChunk: |
| 228 | SendStatusChunk(event.send_status_chunk); |
| 229 | break; |
| 230 | |
| 231 | case EventType::kSetTransferStream: |
| 232 | switch (event.set_transfer_stream) { |
| 233 | case TransferStream::kClientRead: |
| 234 | client_read_stream_ = std::move(staged_client_stream_); |
| 235 | break; |
| 236 | |
| 237 | case TransferStream::kClientWrite: |
| 238 | client_write_stream_ = std::move(staged_client_stream_); |
| 239 | break; |
| 240 | |
| 241 | case TransferStream::kServerRead: |
| 242 | server_read_stream_ = std::move(staged_server_stream_); |
| 243 | break; |
| 244 | |
| 245 | case TransferStream::kServerWrite: |
| 246 | server_write_stream_ = std::move(staged_server_stream_); |
| 247 | break; |
| 248 | } |
| 249 | return; |
| 250 | |
| 251 | case EventType::kAddTransferHandler: |
| 252 | handlers_.push_front(*event.add_transfer_handler); |
| 253 | return; |
| 254 | |
| 255 | case EventType::kRemoveTransferHandler: |
| 256 | handlers_.remove(*event.remove_transfer_handler); |
| 257 | return; |
| 258 | |
| 259 | default: |
| 260 | // Other events are handled by individual transfer contexts. |
| 261 | break; |
| 262 | } |
| 263 | |
| 264 | if (Context* ctx = FindContextForEvent(event); ctx != nullptr) { |
| 265 | if (event.type == EventType::kNewClientTransfer) { |
| 266 | // TODO(frolv): This is terrible. |
| 267 | static_cast<ClientContext*>(ctx)->set_on_completion( |
| 268 | std::move(staged_on_completion_)); |
| 269 | } |
| 270 | |
| 271 | ctx->HandleEvent(event); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | Context* TransferThread::FindContextForEvent( |
| 276 | const internal::Event& event) const { |
| 277 | switch (event.type) { |
| 278 | case EventType::kNewClientTransfer: |
| 279 | return FindNewTransfer(client_transfers_, event.new_transfer.transfer_id); |
| 280 | case EventType::kNewServerTransfer: |
| 281 | return FindNewTransfer(server_transfers_, event.new_transfer.transfer_id); |
| 282 | case EventType::kClientChunk: |
| 283 | return FindActiveTransfer(client_transfers_, event.chunk.transfer_id); |
| 284 | case EventType::kServerChunk: |
| 285 | return FindActiveTransfer(server_transfers_, event.chunk.transfer_id); |
| 286 | case EventType::kClientTimeout: // Manually triggered client timeout |
| 287 | return FindActiveTransfer(client_transfers_, event.chunk.transfer_id); |
| 288 | case EventType::kServerTimeout: // Manually triggered server timeout |
| 289 | return FindActiveTransfer(server_transfers_, event.chunk.transfer_id); |
| 290 | default: |
| 291 | return nullptr; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | void TransferThread::SendStatusChunk( |
| 296 | const internal::SendStatusChunkEvent& event) { |
| 297 | rpc::Writer& destination = stream_for(event.stream); |
| 298 | |
| 299 | internal::Chunk chunk = {}; |
| 300 | chunk.transfer_id = event.transfer_id; |
| 301 | chunk.status = event.status; |
| 302 | |
| 303 | Result<ConstByteSpan> result = internal::EncodeChunk(chunk, chunk_buffer_); |
| 304 | |
| 305 | if (!result.ok()) { |
| 306 | PW_LOG_ERROR("Failed to encode final chunk for transfer %u", |
| 307 | static_cast<unsigned>(event.transfer_id)); |
| 308 | return; |
| 309 | } |
| 310 | |
| 311 | if (!destination.Write(result.value()).ok()) { |
| 312 | PW_LOG_ERROR("Failed to send final chunk for transfer %u", |
| 313 | static_cast<unsigned>(event.transfer_id)); |
| 314 | return; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | } // namespace pw::transfer::internal |
Wyatt Hepler | 70a6210 | 2022-02-11 15:14:35 -0800 | [diff] [blame] | 319 | |
| 320 | PW_MODIFY_DIAGNOSTICS_POP(); |