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63 lines
2.0 KiB
63 lines
2.0 KiB
// Copyright 2021 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_multisink/multisink.h"
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#include <cstring>
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#include "pw_assert/light.h"
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#include "pw_multisink/drain.h"
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#include "pw_status/try.h"
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#include "pw_varint/varint.h"
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namespace pw {
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namespace multisink {
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Result<ConstByteSpan> MultiSink::GetEntry(Drain& drain,
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ByteSpan buffer,
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uint32_t& sequence_id_out) {
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size_t bytes_read = 0;
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// Exit immediately if there's no multisink attached to this drain.
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if (drain.multisink_ == nullptr) {
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return Status::FailedPrecondition();
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}
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const Status status =
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drain.reader_.PeekFrontWithPreamble(buffer, sequence_id_out, bytes_read);
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if (status.IsOutOfRange()) {
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// If the drain has caught up, report the last handled sequence ID so that
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// it can still process any dropped entries.
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sequence_id_out = drain.multisink_->sequence_id_ - 1;
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return status;
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}
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PW_CHECK(drain.reader_.PopFront().ok());
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return std::as_bytes(buffer.first(bytes_read));
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}
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Status MultiSink::AttachDrain(Drain& drain) {
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PW_DCHECK(drain.multisink_ == nullptr);
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drain.multisink_ = this;
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drain.last_handled_sequence_id_ = sequence_id_ - 1;
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return ring_buffer_.AttachReader(drain.reader_);
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}
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Status MultiSink::DetachDrain(Drain& drain) {
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PW_DCHECK(drain.multisink_ == this);
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drain.multisink_ = nullptr;
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return ring_buffer_.DetachReader(drain.reader_);
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}
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} // namespace multisink
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} // namespace pw
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