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// Copyright 2020 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <cstring>
#include "pw_log/log.h"
#include "pw_metric/metric.h"
#include "pw_metric_proto/metric_service.rpc.pb.h"
#include "pw_span/span.h"
namespace pw::metric {
// The MetricService will send metrics when requested by Get(). For now, each
// Get() request results in a stream of responses, containing the metrics from
// the supplied list of groups and metrics. This includes recursive traversal
// of subgroups. In the future, filtering will be supported.
// An important limitation of the current implementation is that the Get()
// method is blocking, and sends all metrics at once (though batched). In the
// future, we may switch to offering an async version where the Get() method
// returns immediately, and someone else is responsible for pumping the queue.
class MetricService final
: public proto::pw_rpc::nanopb::MetricService::Service<MetricService> {
MetricService(const IntrusiveList<Metric>& metrics,
const IntrusiveList<Group>& groups)
: metrics_(metrics), groups_(groups) {}
void Get(const pw_metric_proto_MetricRequest& request,
ServerWriter<pw_metric_proto_MetricResponse>& response);
const IntrusiveList<Metric>& metrics_;
const IntrusiveList<Group>& groups_;
} // namespace pw::metric