269 lines
8.0 KiB
C++
269 lines
8.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "dbus/dbus_statistics.h"
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#include <map>
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#include <tuple>
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#include "base/logging.h"
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#include "base/macros.h"
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#include "base/strings/stringprintf.h"
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#include "base/threading/platform_thread.h"
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#include "base/time/time.h"
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namespace dbus {
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namespace {
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struct StatKey {
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std::string service;
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std::string interface;
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std::string method;
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};
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bool operator<(const StatKey& lhs, const StatKey& rhs) {
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return std::tie(lhs.service, lhs.interface, lhs.method) <
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std::tie(rhs.service, rhs.interface, rhs.method);
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}
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struct StatValue {
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int sent_method_calls = 0;
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int received_signals = 0;
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int sent_blocking_method_calls = 0;
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};
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using StatMap = std::map<StatKey, StatValue>;
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//------------------------------------------------------------------------------
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// DBusStatistics
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// Simple class for gathering DBus usage statistics.
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class DBusStatistics {
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public:
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DBusStatistics()
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: start_time_(base::Time::Now()),
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origin_thread_id_(base::PlatformThread::CurrentId()) {
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}
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~DBusStatistics() {
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DCHECK_EQ(origin_thread_id_, base::PlatformThread::CurrentId());
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}
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// Enum to specify which field in Stat to increment in AddStat.
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enum StatType {
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TYPE_SENT_METHOD_CALLS,
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TYPE_RECEIVED_SIGNALS,
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TYPE_SENT_BLOCKING_METHOD_CALLS
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};
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// Add a call to |method| for |interface|. See also MethodCall in message.h.
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void AddStat(const std::string& service,
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const std::string& interface,
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const std::string& method,
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StatType type) {
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if (base::PlatformThread::CurrentId() != origin_thread_id_) {
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DVLOG(1) << "Ignoring DBusStatistics::AddStat call from thread: "
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<< base::PlatformThread::CurrentId();
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return;
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}
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StatValue* stat = GetStats(service, interface, method, true);
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DCHECK(stat);
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if (type == TYPE_SENT_METHOD_CALLS)
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++stat->sent_method_calls;
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else if (type == TYPE_RECEIVED_SIGNALS)
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++stat->received_signals;
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else if (type == TYPE_SENT_BLOCKING_METHOD_CALLS)
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++stat->sent_blocking_method_calls;
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else
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NOTREACHED();
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}
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// Look up the Stat entry in |stats_|. If |add_stat| is true, add a new entry
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// if one does not already exist.
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StatValue* GetStats(const std::string& service,
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const std::string& interface,
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const std::string& method,
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bool add_stat) {
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DCHECK_EQ(origin_thread_id_, base::PlatformThread::CurrentId());
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StatKey key = {service, interface, method};
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auto it = stats_.find(key);
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if (it != stats_.end())
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return &(it->second);
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if (!add_stat)
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return nullptr;
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return &(stats_[key]);
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}
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StatMap& stats() { return stats_; }
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base::Time start_time() { return start_time_; }
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private:
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StatMap stats_;
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base::Time start_time_;
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base::PlatformThreadId origin_thread_id_;
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DISALLOW_COPY_AND_ASSIGN(DBusStatistics);
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};
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DBusStatistics* g_dbus_statistics = nullptr;
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} // namespace
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//------------------------------------------------------------------------------
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namespace statistics {
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void Initialize() {
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if (g_dbus_statistics)
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delete g_dbus_statistics; // reset statistics
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g_dbus_statistics = new DBusStatistics();
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}
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void Shutdown() {
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delete g_dbus_statistics;
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g_dbus_statistics = nullptr;
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}
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void AddSentMethodCall(const std::string& service,
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const std::string& interface,
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const std::string& method) {
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if (!g_dbus_statistics)
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return;
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g_dbus_statistics->AddStat(
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service, interface, method, DBusStatistics::TYPE_SENT_METHOD_CALLS);
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}
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void AddReceivedSignal(const std::string& service,
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const std::string& interface,
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const std::string& method) {
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if (!g_dbus_statistics)
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return;
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g_dbus_statistics->AddStat(
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service, interface, method, DBusStatistics::TYPE_RECEIVED_SIGNALS);
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}
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void AddBlockingSentMethodCall(const std::string& service,
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const std::string& interface,
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const std::string& method) {
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if (!g_dbus_statistics)
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return;
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g_dbus_statistics->AddStat(
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service, interface, method,
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DBusStatistics::TYPE_SENT_BLOCKING_METHOD_CALLS);
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}
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// NOTE: If the output format is changed, be certain to change the test
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// expectations as well.
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std::string GetAsString(ShowInString show, FormatString format) {
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if (!g_dbus_statistics)
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return "DBusStatistics not initialized.";
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const StatMap& stats = g_dbus_statistics->stats();
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if (stats.empty())
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return "No DBus calls.";
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base::TimeDelta dtime = base::Time::Now() - g_dbus_statistics->start_time();
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int dminutes = dtime.InMinutes();
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dminutes = std::max(dminutes, 1);
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std::string result;
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int sent = 0, received = 0, sent_blocking = 0;
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// Stats are stored in order by service, then interface, then method.
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for (auto iter = stats.begin(); iter != stats.end();) {
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auto cur_iter = iter;
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auto next_iter = ++iter;
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const StatKey& stat_key = cur_iter->first;
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const StatValue& stat = cur_iter->second;
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sent += stat.sent_method_calls;
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received += stat.received_signals;
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sent_blocking += stat.sent_blocking_method_calls;
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// If this is not the last stat, and if the next stat matches the current
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// stat, continue.
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if (next_iter != stats.end() &&
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next_iter->first.service == stat_key.service &&
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(show < SHOW_INTERFACE ||
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next_iter->first.interface == stat_key.interface) &&
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(show < SHOW_METHOD || next_iter->first.method == stat_key.method))
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continue;
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if (!sent && !received && !sent_blocking)
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continue; // No stats collected for this line, skip it and continue.
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// Add a line to the result and clear the counts.
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std::string line;
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if (show == SHOW_SERVICE) {
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line += stat_key.service;
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} else {
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// The interface usually includes the service so don't show both.
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line += stat_key.interface;
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if (show >= SHOW_METHOD)
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line += "." + stat_key.method;
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}
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line += base::StringPrintf(":");
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if (sent_blocking) {
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line += base::StringPrintf(" Sent (BLOCKING):");
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if (format == FORMAT_TOTALS)
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line += base::StringPrintf(" %d", sent_blocking);
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else if (format == FORMAT_PER_MINUTE)
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line += base::StringPrintf(" %d/min", sent_blocking / dminutes);
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else if (format == FORMAT_ALL)
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line += base::StringPrintf(" %d (%d/min)",
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sent_blocking, sent_blocking / dminutes);
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}
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if (sent) {
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line += base::StringPrintf(" Sent:");
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if (format == FORMAT_TOTALS)
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line += base::StringPrintf(" %d", sent);
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else if (format == FORMAT_PER_MINUTE)
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line += base::StringPrintf(" %d/min", sent / dminutes);
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else if (format == FORMAT_ALL)
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line += base::StringPrintf(" %d (%d/min)", sent, sent / dminutes);
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}
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if (received) {
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line += base::StringPrintf(" Received:");
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if (format == FORMAT_TOTALS)
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line += base::StringPrintf(" %d", received);
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else if (format == FORMAT_PER_MINUTE)
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line += base::StringPrintf(" %d/min", received / dminutes);
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else if (format == FORMAT_ALL)
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line += base::StringPrintf(
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" %d (%d/min)", received, received / dminutes);
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}
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result += line + "\n";
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sent = 0;
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sent_blocking = 0;
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received = 0;
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}
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return result;
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}
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namespace testing {
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bool GetCalls(const std::string& service,
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const std::string& interface,
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const std::string& method,
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int* sent,
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int* received,
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int* blocking) {
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if (!g_dbus_statistics)
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return false;
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StatValue* stat =
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g_dbus_statistics->GetStats(service, interface, method, false);
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if (!stat)
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return false;
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*sent = stat->sent_method_calls;
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*received = stat->received_signals;
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*blocking = stat->sent_blocking_method_calls;
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return true;
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}
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} // namespace testing
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} // namespace statistics
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} // namespace dbus
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