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76 lines
2.5 KiB
76 lines
2.5 KiB
8 months ago
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// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_log_rpc/logs_rpc.h"
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#include "pw_log/log.h"
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#include "pw_log_proto/log.pwpb.h"
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#include "pw_status/try.h"
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namespace pw::log_rpc {
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namespace {
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Result<ConstByteSpan> GenerateDroppedEntryMessage(ByteSpan encode_buffer,
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size_t dropped_entries) {
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pw::protobuf::NestedEncoder nested_encoder(encode_buffer);
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pw::log::LogEntry::Encoder encoder(&nested_encoder);
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encoder.WriteDropped(dropped_entries);
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return nested_encoder.Encode();
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}
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} // namespace
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void Logs::Get(ServerContext&, ConstByteSpan, rpc::RawServerWriter& writer) {
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response_writer_ = std::move(writer);
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}
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Status Logs::Flush() {
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// If the response writer was not initialized or has since been closed,
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// ignore the flush operation.
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if (!response_writer_.open()) {
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return OkStatus();
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}
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// If previous calls to flush resulted in dropped entries, generate a
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// dropped entry message and write it before further log messages.
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if (dropped_entries_ > 0) {
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ByteSpan payload = response_writer_.PayloadBuffer();
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Result dropped_log = GenerateDroppedEntryMessage(payload, dropped_entries_);
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PW_TRY(dropped_log.status());
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PW_TRY(response_writer_.Write(dropped_log.value()));
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dropped_entries_ = 0;
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}
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// Write logs to the response writer. An important limitation of this
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// implementation is that if this RPC call fails, the logs are lost -
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// a subsequent call to the RPC will produce a drop count message.
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ByteSpan payload = response_writer_.PayloadBuffer();
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Result possible_logs = log_queue_.PopMultiple(payload);
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PW_TRY(possible_logs.status());
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if (possible_logs.value().entry_count == 0) {
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return OkStatus();
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}
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Status status = response_writer_.Write(possible_logs.value().entries);
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if (!status.ok()) {
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// On a failure to send logs, track the dropped entries.
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dropped_entries_ = possible_logs.value().entry_count;
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return status;
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}
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return OkStatus();
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}
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} // namespace pw::log_rpc
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