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// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#pragma once
#include <stdint.h>
#include <cobalt-client/cpp/collector.h>
#include <cobalt-client/cpp/histogram.h>
namespace fs {
// Vnode related histograms.
struct VnodeMetrics {
// Number of buckets used for the vnode metrics.
static constexpr uint32_t kHistogramBuckets = 10;
VnodeMetrics(cobalt_client::Collector* collector, const fbl::String& fs_name,
bool local_metrics);
cobalt_client::Histogram<kHistogramBuckets> close;
cobalt_client::Histogram<kHistogramBuckets> read;
cobalt_client::Histogram<kHistogramBuckets> write;
cobalt_client::Histogram<kHistogramBuckets> append;
cobalt_client::Histogram<kHistogramBuckets> truncate;
cobalt_client::Histogram<kHistogramBuckets> set_attr;
cobalt_client::Histogram<kHistogramBuckets> get_attr;
cobalt_client::Histogram<kHistogramBuckets> sync;
cobalt_client::Histogram<kHistogramBuckets> read_dir;
cobalt_client::Histogram<kHistogramBuckets> look_up;
cobalt_client::Histogram<kHistogramBuckets> create;
cobalt_client::Histogram<kHistogramBuckets> unlink;
cobalt_client::Histogram<kHistogramBuckets> link;
// Mirrors |Metrics::IsEnabled|, such that |VnodeMetrics| is self sufficient
// to determine whether metrics should be logged or not.
bool metrics_enabled = false;
// Provides a base class for collecting metrics in FS implementations. This is optional, but
// provides a source of truth of how data is collected for filesystems. Specific filesystem
// implementations with custom APIs can extend and collect more data, but for basic operations, this
// class provides the base infrastructure.
// TODO(gevalentino): Define the |event_code| per metric. Currently is ignored.
class Metrics {
Metrics() = delete;
Metrics(cobalt_client::CollectorOptions collector_options, bool local_metrics,
const fbl::String& fs_name);
Metrics(const Metrics&) = delete;
Metrics(Metrics&&) = delete;
Metrics& operator=(const Metrics&) = delete;
Metrics& operator=(Metrics&&) = delete;
virtual ~Metrics() = default;
// Sets metric collection status to |should_collect|.
void EnableMetrics(bool should_enable);
// Returns true if the Logger is collecting.
bool IsEnabled() const;
// Returns the collector.
const cobalt_client::Collector& collector() const { return collector_; }
// Returns the collector.
cobalt_client::Collector* mutable_collector() { return &collector_; }
const VnodeMetrics& vnode_metrics() const;
VnodeMetrics* mutable_vnode_metrics();
cobalt_client::Collector collector_;
VnodeMetrics vnode_metrics_;
bool is_enabled_ = false;
} // namespace fs