76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
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// Copyright 2022 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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#pragma once
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#include "pw_assert/check.h"
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#include "pw_containers/intrusive_list.h"
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#include "pw_containers/vector.h"
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#include "pw_metric/metric.h"
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#include "pw_status/status.h"
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#include "pw_tokenizer/tokenize.h"
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namespace pw::metric::internal {
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class MetricWriter {
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public:
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virtual ~MetricWriter() = default;
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virtual Status Write(const Metric& metric, const Vector<Token>& path) = 0;
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};
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// Walk a metric tree recursively; passing metrics with their path (names) to a
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// MetricWriter that can consume them.
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class MetricWalker {
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public:
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MetricWalker(MetricWriter& writer) : writer_(writer) {}
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Status Walk(const IntrusiveList<Metric>& metrics) {
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for (const auto& m : metrics) {
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ScopedName scoped_name(m.name(), *this);
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PW_TRY(writer_.Write(m, path_));
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}
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return OkStatus();
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}
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Status Walk(const IntrusiveList<Group>& groups) {
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for (const auto& g : groups) {
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PW_TRY(Walk(g));
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}
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return OkStatus();
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}
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Status Walk(const Group& group) {
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ScopedName scoped_name(group.name(), *this);
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PW_TRY(Walk(group.children()));
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PW_TRY(Walk(group.metrics()));
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return OkStatus();
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}
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private:
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// Exists to safely push/pop parent groups from the explicit stack.
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struct ScopedName {
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ScopedName(Token name, MetricWalker& rhs) : walker(rhs) {
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// Metrics are too deep; bump path_ capacity.
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PW_ASSERT(walker.path_.size() < walker.path_.capacity());
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walker.path_.push_back(name);
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}
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~ScopedName() { walker.path_.pop_back(); }
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MetricWalker& walker;
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};
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Vector<Token, /*capacity=*/4> path_;
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MetricWriter& writer_;
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};
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} // namespace pw::metric::internal
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