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128 lines
3.2 KiB
128 lines
3.2 KiB
// 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_metric/metric.h"
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#include <array>
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#include <span>
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#include "pw_log/log.h"
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#include "pw_tokenizer/base64.h"
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namespace pw::metric {
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namespace {
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template <typename T>
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std::span<const std::byte> AsSpan(const T& t) {
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return std::span<const std::byte>(reinterpret_cast<const std::byte*>(&t),
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sizeof(t));
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}
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// A convenience class to encode a token as base64 while managing the storage.
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// TODO(keir): Consider putting this into upstream pw_tokenizer.
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struct Base64EncodedToken {
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Base64EncodedToken(Token token) {
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int encoded_size = tokenizer::PrefixedBase64Encode(AsSpan(token), data);
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data[encoded_size] = 0;
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}
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const char* value() { return data.data(); }
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std::array<char, 16> data;
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};
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const char* Indent(int level) {
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static const char* kWhitespace8 = " ";
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level = std::min(level, 4);
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return kWhitespace8 + 8 - 2 * level;
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}
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} // namespace
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// Enable easier registration when used as a member.
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Metric::Metric(Token name, float value, IntrusiveList<Metric>& metrics)
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: Metric(name, value) {
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metrics.push_front(*this);
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}
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Metric::Metric(Token name, uint32_t value, IntrusiveList<Metric>& metrics)
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: Metric(name, value) {
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metrics.push_front(*this);
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}
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float Metric::as_float() const {
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PW_DCHECK(is_float());
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return float_;
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}
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uint32_t Metric::as_int() const {
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PW_DCHECK(is_int());
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return uint_;
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}
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void Metric::Increment(uint32_t amount) {
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PW_DCHECK(is_int());
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uint_ += amount;
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}
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void Metric::SetInt(uint32_t value) {
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PW_DCHECK(is_int());
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uint_ = value;
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}
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void Metric::SetFloat(float value) {
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PW_DCHECK(is_float());
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float_ = value;
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}
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void Metric::Dump(int level) {
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Base64EncodedToken encoded_name(name());
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const char* indent = Indent(level);
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if (is_float()) {
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PW_LOG_INFO("%s \"%s\": %f,", indent, encoded_name.value(), as_float());
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} else {
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PW_LOG_INFO("%s \"%s\": %u,",
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indent,
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encoded_name.value(),
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static_cast<unsigned int>(as_int()));
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}
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}
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void Metric::Dump(IntrusiveList<Metric>& metrics, int level) {
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for (auto& m : metrics) {
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m.Dump(level);
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}
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}
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Group::Group(Token name) : name_(name) {}
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Group::Group(Token name, IntrusiveList<Group>& groups) : name_(name) {
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groups.push_front(*this);
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}
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void Group::Dump(int level) {
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Base64EncodedToken encoded_name(name());
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const char* indent = Indent(level);
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PW_LOG_INFO("%s \"%s\": {", indent, encoded_name.value());
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Group::Dump(children(), level + 1);
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Metric::Dump(metrics(), level + 1);
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PW_LOG_INFO("%s }", indent);
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}
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void Group::Dump(IntrusiveList<Group>& groups, int level) {
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for (auto& group : groups) {
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group.Dump(level);
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}
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}
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} // namespace pw::metric
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