garnet/examples/inspection/example_server_app.cc

// Copyright 2019 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.

#include "example_server_app.h"

#include <lib/sys/cpp/component_context.h>

#include "lib/fidl/cpp/interface_request.h"

namespace example {

constexpr size_t kRequestHistogramBuckets = 10;
constexpr uint64_t kRequestHistogramFloor = 1;
constexpr uint64_t kRequestHistogramInitialStep = 1;
constexpr uint64_t kRequestHistogramStepMultiplier = 2;

ExampleServerApp::ExampleServerApp()
    : ExampleServerApp(sys::ComponentContext::Create()) {}

ExampleServerApp::ExampleServerApp(
    std::unique_ptr<sys::ComponentContext> context)
    : context_(std::move(context)) {
  inspector_ = inspect::ComponentInspector::Initialize(context_.get());
  connections_node_ =
      inspector_->root_tree()->GetRoot().CreateChild("connections");

  echo_stats_ = std::make_shared<EchoConnectionStats>(EchoConnectionStats{
      inspector_->root_tree()->GetRoot().CreateExponentialUIntHistogramMetric(
          "request_size_histogram", kRequestHistogramFloor,
          kRequestHistogramInitialStep, kRequestHistogramStepMultiplier,
          kRequestHistogramBuckets),
      inspector_->root_tree()->GetRoot().CreateUIntMetric("total_requests", 0),
  });

  context_->outgoing()->AddPublicService<EchoConnection::Echo>(
      [this](fidl::InterfaceRequest<EchoConnection::Echo> request) {
        bindings_.AddBinding(std::make_unique<EchoConnection>(
                                 connections_node_.CreateChild(
                                     std::to_string(connection_count_++)),
                                 echo_stats_),
                             std::move(request));
      });
}

}  // namespace example