WIP adding support for tracking network requests.

ext/clementine-tagreader/tagreaderworker.cpp

@@ -24,8 +24,13 @@
 #include <QTextCodec>
 #include <QUrl>
 
+#include "core/recordingnetworkaccessmanager.h"
+
+using pb::tagreader::NetworkStatisticsResponse;
+
 TagReaderWorker::TagReaderWorker(QIODevice* socket, QObject* parent)
-    : AbstractMessageHandler<pb::tagreader::Message>(socket, parent) {}
+    : AbstractMessageHandler<pb::tagreader::Message>(socket, parent),
+      tag_reader_(new RecordingNetworkAccessManager) {}
 
 void TagReaderWorker::MessageArrived(const pb::tagreader::Message& message) {
   pb::tagreader::Message reply;
@@ -80,6 +85,8 @@ void TagReaderWorker::MessageArrived(const pb::tagreader::Message& message) {
       reply.mutable_read_cloud_file_response()->clear_metadata();
     }
 #endif
+  } else if (message.has_network_statistics_request()) {
+    ReportNetworkStatistics(reply.mutable_network_statistics_response());
   }
 
   SendReply(message, &reply);
@@ -90,3 +97,16 @@ void TagReaderWorker::DeviceClosed() {
 
   qApp->exit();
 }
+
+void TagReaderWorker::ReportNetworkStatistics(
+    NetworkStatisticsResponse* response) const {
+  QList<RecordingNetworkAccessManager::NetworkStat*> stats =
+      RecordingNetworkAccessManager::GetNetworkStatistics();
+  for (RecordingNetworkAccessManager::NetworkStat* stat : stats) {
+    NetworkStatisticsResponse::Entry* entry = response->add_entry();
+    entry->set_url(stat->url.toStdString());
+    entry->set_operation(
+        static_cast<NetworkStatisticsResponse::Operation>(stat->operation));
+    entry->set_bytes_received(stat->bytes_received);
+  }
+}

ext/clementine-tagreader/tagreaderworker.h

@@ -32,6 +32,9 @@ class TagReaderWorker : public AbstractMessageHandler<pb::tagreader::Message> {
   void DeviceClosed();
 
  private:
+  void ReportNetworkStatistics(
+      pb::tagreader::NetworkStatisticsResponse* response) const;
+
   TagReader tag_reader_;
 };
 

ext/libclementine-common/CMakeLists.txt

@@ -10,6 +10,7 @@ set(SOURCES
   core/logging.cpp
   core/messagehandler.cpp
   core/messagereply.cpp
+  core/recordingnetworkaccessmanager.cpp
   core/waitforsignal.cpp
   core/workerpool.cpp
 )
@@ -18,6 +19,7 @@ set(HEADERS
   core/closure.h
   core/messagehandler.h
   core/messagereply.h
+  core/recordingnetworkaccessmanager.h
   core/workerpool.h
 )
 

ext/libclementine-common/core/closure.cpp

@@ -26,8 +26,9 @@ ClosureBase::ClosureBase(ObjectHelper* helper) : helper_(helper) {}
 ClosureBase::~ClosureBase() {}
 
 CallbackClosure::CallbackClosure(QObject* sender, const char* signal,
-                                 std::function<void()> callback)
-    : ClosureBase(new ObjectHelper(sender, signal, this)),
+                                 std::function<void()> callback,
+                                 bool permanent)
+    : ClosureBase(new ObjectHelper(sender, signal, this, permanent)),
       callback_(callback) {}
 
 void CallbackClosure::Invoke() { callback_(); }
@@ -35,15 +36,16 @@ void CallbackClosure::Invoke() { callback_(); }
 ObjectHelper* ClosureBase::helper() const { return helper_; }
 
 ObjectHelper::ObjectHelper(QObject* sender, const char* signal,
-                           ClosureBase* closure)
-    : closure_(closure) {
+                           ClosureBase* closure, bool permanent)
+    : closure_(closure),
+      permanent_(permanent) {
   connect(sender, signal, SLOT(Invoked()));
   connect(sender, SIGNAL(destroyed()), SLOT(deleteLater()));
 }
 
 void ObjectHelper::Invoked() {
   closure_->Invoke();
-  deleteLater();
+  if (!permanent_) deleteLater();
 }
 
 void Unpack(QList<QGenericArgument>*) {}
@@ -55,6 +57,11 @@ _detail::ClosureBase* NewClosure(QObject* sender, const char* signal,
   return new _detail::CallbackClosure(sender, signal, callback);
 }
 
+_detail::ClosureBase* NewPermanentClosure(QObject* sender, const char* signal,
+                                 std::function<void()> callback) {
+  return new _detail::CallbackClosure(sender, signal, callback, true);
+}
+
 void DoAfter(QObject* receiver, const char* slot, int msec) {
   QTimer::singleShot(msec, receiver, slot);
 }

ext/libclementine-common/core/closure.h

@@ -54,13 +54,15 @@ class ClosureBase {
 class ObjectHelper : public QObject {
   Q_OBJECT
  public:
-  ObjectHelper(QObject* parent, const char* signal, ClosureBase* closure);
+  ObjectHelper(QObject* parent, const char* signal, ClosureBase* closure,
+               bool permanent = false);
 
  private slots:
   void Invoked();
 
  private:
   std::unique_ptr<ClosureBase> closure_;
+  bool permanent_;
   Q_DISABLE_COPY(ObjectHelper);
 };
 
@@ -139,7 +141,7 @@ class SharedClosure : public Closure<Args...> {
 class CallbackClosure : public ClosureBase {
  public:
   CallbackClosure(QObject* sender, const char* signal,
-                  std::function<void()> callback);
+                  std::function<void()> callback, bool permanent = false);
 
   virtual void Invoke();
 
@@ -168,6 +170,9 @@ _detail::ClosureBase* NewClosure(QSharedPointer<T> sender, const char* signal,
 _detail::ClosureBase* NewClosure(QObject* sender, const char* signal,
                                  std::function<void()> callback);
 
+_detail::ClosureBase* NewPermanentClosure(QObject* sender, const char* signal,
+                                          std::function<void()> callback);
+
 template <typename... Args>
 _detail::ClosureBase* NewClosure(QObject* sender, const char* signal,
                                  std::function<void(Args...)> callback,

ext/libclementine-common/core/messagereply.h

@@ -39,7 +39,7 @@ class _MessageReplyBase : public QObject {
   // Waits for the reply to finish by waiting on a semaphore.  Never call this
   // from the MessageHandler's thread or it will block forever.
   // Returns true if the call was successful.
-  bool WaitForFinished();
+  virtual bool WaitForFinished();
 
   void Abort();
 
@@ -64,7 +64,7 @@ class MessageReply : public _MessageReplyBase {
   const MessageType& request_message() const { return request_message_; }
   const MessageType& message() const { return reply_message_; }
 
-  void SetReply(const MessageType& message);
+  virtual void SetReply(const MessageType& message);
 
  private:
   MessageType request_message_;

ext/libclementine-common/core/recordingnetworkaccessmanager.cpp

@@ -0,0 +1,54 @@
+#include "recordingnetworkaccessmanager.h"
+
+#include <QMutexLocker>
+#include <QNetworkReply>
+
+#include "core/closure.h"
+#include "core/logging.h"
+
+QMutex RecordingNetworkAccessManager::sMutex;
+QList<RecordingNetworkAccessManager::NetworkStat*>*
+RecordingNetworkAccessManager::sTrafficStats;
+
+RecordingNetworkAccessManager::NetworkStat::NetworkStat(
+    QString url, QNetworkAccessManager::Operation op, int bytes_received)
+  : url(url), operation(op), bytes_received(bytes_received) {}
+
+RecordingNetworkAccessManager::RecordingNetworkAccessManager(QObject* parent)
+    : QNetworkAccessManager(parent) {
+  StaticInit();
+}
+
+QNetworkReply* RecordingNetworkAccessManager::createRequest(
+    Operation op, const QNetworkRequest& req, QIODevice* data) {
+  QNetworkReply* reply = QNetworkAccessManager::createRequest(op, req, data);
+  NewClosure(
+      reply, SIGNAL(finished()), this, SLOT(Finished(QNetworkReply*)), reply);
+  // TODO: Listen to uploadProgress() too.
+  return reply;
+}
+
+void RecordingNetworkAccessManager::Finished(QNetworkReply* reply) const {
+  RecordRequest(*reply);
+}
+
+void RecordingNetworkAccessManager::StaticInit() {
+  QMutexLocker l(&sMutex);
+  if (sTrafficStats == nullptr) {
+    sTrafficStats = new QList<NetworkStat*>;
+  }
+}
+
+void RecordingNetworkAccessManager::RecordRequest(const QNetworkReply& reply) {
+  qLog(Debug) << "Recording request" << reply.request().url() << sTrafficStats;
+  QMutexLocker l(&sMutex);
+  sTrafficStats->append(new NetworkStat(
+      reply.request().url().toString(), reply.operation(), reply.size()));
+  qLog(Debug) << "Stats:" << sTrafficStats->count();
+}
+
+QList<RecordingNetworkAccessManager::NetworkStat*>
+RecordingNetworkAccessManager::GetNetworkStatistics() {
+  QMutexLocker l(&sMutex);
+  return *sTrafficStats;
+}

ext/libclementine-common/core/recordingnetworkaccessmanager.h

@@ -0,0 +1,55 @@
+/* This file is part of Clementine.
+   Copyright 2015, John Maguire <john.maguire@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef RECORDINGNETWORKACCESSMANAGER_H
+#define RECORDINGNETWORKACCESSMANAGER_H
+
+#include <QMap>
+#include <QMutex>
+#include <QNetworkAccessManager>
+
+class RecordingNetworkAccessManager : public QNetworkAccessManager {
+  Q_OBJECT
+ public:
+  explicit RecordingNetworkAccessManager(QObject* parent = nullptr);
+
+  struct NetworkStat {
+    QString url;  // Stripped of params.
+    QNetworkAccessManager::Operation operation;
+    int bytes_received;
+
+    NetworkStat(QString, QNetworkAccessManager::Operation, int);
+  };
+
+  static QList<NetworkStat*> GetNetworkStatistics();
+
+ protected:
+  QNetworkReply* createRequest(
+      Operation op, const QNetworkRequest& req, QIODevice* data = 0) override;
+
+ private slots:
+  void Finished(QNetworkReply* reply) const;
+
+ private:
+  static void RecordRequest(const QNetworkReply& reply);
+  static void StaticInit();
+
+  static QMutex sMutex;
+  static QList<NetworkStat*>* sTrafficStats;
+};
+
+#endif  // RECORDINGNETWORKACCESSMANAGER_H

ext/libclementine-common/core/workerpool.h

@@ -21,6 +21,7 @@
 #include <QAtomicInt>
 #include <QCoreApplication>
 #include <QFile>
+#include <QList>
 #include <QLocalServer>
 #include <QLocalSocket>
 #include <QMutex>
@@ -88,6 +89,8 @@ class WorkerPool : public _WorkerPoolBase {
   // worker.  Can be called from any thread.
   ReplyType* SendMessageWithReply(MessageType* message);
 
+  QList<ReplyType*> BroadcastMessageWithReply(MessageType* message);
+
  protected:
   // These are all reimplemented slots, they are called on the WorkerPool's
   // thread.
@@ -141,6 +144,31 @@ class WorkerPool : public _WorkerPoolBase {
   // my thread.
   HandlerType* NextHandler() const;
 
+
+  class BroadcastReply : public ReplyType {
+   public:
+    BroadcastReply(
+        const MessageType& request_message,
+        QList<ReplyType*> replies, QObject* parent = nullptr)
+        : ReplyType(request_message, parent),
+          replies_(replies) {
+      for (ReplyType* reply : replies_) {
+        NewClosure(reply, SIGNAL(Finished(bool)), [&]() {
+          int finished = 0;
+          for (ReplyType* reply : replies_) {
+            finished += reply->is_finished() ? 1 : 0;
+          }
+          if (finished == replies_.count()) {
+            emit this->Finished(true);
+          }
+        });
+      }
+    }
+
+   private:
+    QList<ReplyType*> replies_;
+  };
+
  private:
   QString local_server_name_;
   QString executable_name_;
@@ -369,6 +397,19 @@ WorkerPool<HandlerType>::SendMessageWithReply(MessageType* message) {
   return reply;
 }
 
+template <typename HandlerType>
+QList<typename WorkerPool<HandlerType>::ReplyType*>
+WorkerPool<HandlerType>::BroadcastMessageWithReply(MessageType* message) {
+  QList<ReplyType*> replies;
+  for (const Worker& worker : workers_) {
+    ReplyType* reply = NewReply(message);
+    replies << reply;
+    worker.handler_->SendRequest(reply);
+    qLog(Debug) << "Sent request to worker: " << &worker;
+  }
+  return replies;
+}
+
 template <typename HandlerType>
 void WorkerPool<HandlerType>::SendQueuedMessages() {
   QMutexLocker l(&message_queue_mutex_);

ext/libclementine-tagreader/tagreader.cpp

@@ -116,9 +116,9 @@ const char* kASF_OriginalDate_ID = "WM/OriginalReleaseTime";
 const char* kASF_OriginalYear_ID = "WM/OriginalReleaseYear";
 }
 
-TagReader::TagReader()
+TagReader::TagReader(QNetworkAccessManager* network)
     : factory_(new TagLibFileRefFactory),
-      network_(new QNetworkAccessManager),
+      network_(network ? network : new QNetworkAccessManager),
       kEmbeddedCover("(embedded)") {}
 
 void TagReader::ReadFile(const QString& filename,
@@ -1072,7 +1072,7 @@ bool TagReader::ReadCloudFile(const QUrl& download_url, const QString& title,
   qLog(Debug) << "Loading tags from" << title;
 
   std::unique_ptr<CloudStream> stream(new CloudStream(
-      download_url, title, size, authorisation_header, network_));
+      download_url, title, size, authorisation_header, network_.get()));
   stream->Precache();
   std::unique_ptr<TagLib::File> tag;
   if (mime_type == "audio/mpeg" && title.endsWith(".mp3")) {

ext/libclementine-tagreader/tagreader.h

@@ -18,7 +18,10 @@
 #ifndef TAGREADER_H
 #define TAGREADER_H
 
+#include <memory>
+
 #include <QByteArray>
+#include <QNetworkAccessManager>
 
 #include <taglib/xiphcomment.h>
 
@@ -49,7 +52,7 @@ class FileRefFactory;
  */
 class TagReader {
  public:
-  TagReader();
+  TagReader(QNetworkAccessManager* network = 0);
 
   void ReadFile(const QString& filename,
                 pb::tagreader::SongMetadata* song) const;
@@ -120,7 +123,7 @@ class TagReader {
       TagLib::ID3v2::Tag* tag);
 
   FileRefFactory* factory_;
-  QNetworkAccessManager* network_;
+  std::unique_ptr<QNetworkAccessManager> network_;
 
   const std::string kEmbeddedCover;
 };

ext/libclementine-tagreader/tagreadermessages.proto

@@ -118,6 +118,30 @@ message SaveSongRatingToFileResponse {
   optional bool success = 1;
 }
 
+message NetworkStatisticsRequest {
+}
+
+message NetworkStatisticsResponse {
+  // This should match QNetworkAccessManager::Operation.
+  enum Operation {
+    UNKNOWN = 0;
+    HEAD = 1;
+    GET = 2;
+    PUT = 3;
+    POST = 4;
+    DELETE = 5;
+    CUSTOM = 6;
+  }
+
+  message Entry {
+    optional string url = 1;
+    optional Operation operation = 2;
+    optional int32 bytes_sent = 3;
+    optional int32 bytes_received = 4;
+  }
+  repeated Entry entry = 1;
+}
+
 message Message {
   optional int32 id = 1;
 
@@ -135,10 +159,13 @@ message Message {
 
   optional ReadCloudFileRequest read_cloud_file_request = 10;
   optional ReadCloudFileResponse read_cloud_file_response = 11;
-  
+
   optional SaveSongStatisticsToFileRequest save_song_statistics_to_file_request = 12;
   optional SaveSongStatisticsToFileResponse save_song_statistics_to_file_response = 13;
-  
+
   optional SaveSongRatingToFileRequest save_song_rating_to_file_request = 14;
   optional SaveSongRatingToFileResponse save_song_rating_to_file_response = 15;
+
+  optional NetworkStatisticsRequest network_statistics_request = 16;
+  optional NetworkStatisticsResponse network_statistics_response = 17;
 }

src/CMakeLists.txt

@@ -1197,6 +1197,11 @@ optional_source(LINUX
   HEADERS core/ubuntuunityhack.h
 )
 
+optional_source(LINUX
+  SOURCES core/signalhandler.cpp
+  HEADERS core/signalhandler.h
+)
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
                ${CMAKE_CURRENT_BINARY_DIR}/config.h)
 

src/core/network.cpp

@@ -26,11 +26,15 @@
 #include <QNetworkReply>
 
 #include "core/closure.h"
-#include "utilities.h"
+#include "core/logging.h"
+#include "core/utilities.h"
 
 QMutex ThreadSafeNetworkDiskCache::sMutex;
 QNetworkDiskCache* ThreadSafeNetworkDiskCache::sCache = nullptr;
 
+QMutex NetworkAccessManager::sMutex;
+QMap<QString, int>* NetworkAccessManager::sTrafficAnalysis = nullptr;
+
 ThreadSafeNetworkDiskCache::ThreadSafeNetworkDiskCache(QObject* parent) {
   QMutexLocker l(&sMutex);
   if (!sCache) {
@@ -84,9 +88,23 @@ void ThreadSafeNetworkDiskCache::clear() {
 
 NetworkAccessManager::NetworkAccessManager(QObject* parent)
     : QNetworkAccessManager(parent) {
+  StaticInit();
   setCache(new ThreadSafeNetworkDiskCache(this));
 }
 
+void NetworkAccessManager::StaticInit() {
+  QMutexLocker l(&sMutex);
+  if (sTrafficAnalysis == nullptr) {
+    sTrafficAnalysis = new QMap<QString, int>;
+  }
+}
+
+void NetworkAccessManager::PrintNetworkStatistics() {
+  for (const auto& it : sTrafficAnalysis->toStdMap()) {
+    qLog(Debug) << it.first << it.second;
+  }
+}
+
 QNetworkReply* NetworkAccessManager::createRequest(
     Operation op, const QNetworkRequest& request, QIODevice* outgoingData) {
   QByteArray user_agent = QString("%1 %2")
@@ -116,9 +134,28 @@ QNetworkReply* NetworkAccessManager::createRequest(
                              QNetworkRequest::PreferCache);
   }
 
+  RecordRequest(new_request);
   return QNetworkAccessManager::createRequest(op, new_request, outgoingData);
 }
 
+void NetworkAccessManager::RecordRequest(const QNetworkRequest& request) {
+  QMutexLocker l(&sMutex);
+  if (sTrafficAnalysis == nullptr) return;
+
+  const QUrl& url = request.url();
+  const QString recorded = QString("%1://%2:%3%4")
+      .arg(url.scheme())
+      .arg(url.host())
+      .arg(url.port())
+      .arg(url.path());
+
+  if (sTrafficAnalysis->contains(recorded)) {
+    ++(*sTrafficAnalysis)[recorded];
+  } else {
+    (*sTrafficAnalysis)[recorded] = 1;
+  }
+}
+
 NetworkTimeouts::NetworkTimeouts(int timeout_msec, QObject* parent)
     : timeout_msec_(timeout_msec) {}
 

src/core/network.h

@@ -21,6 +21,7 @@
 #define CORE_NETWORK_H_
 
 #include <QAbstractNetworkCache>
+#include <QMap>
 #include <QMutex>
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
@@ -55,6 +56,14 @@ class NetworkAccessManager : public QNetworkAccessManager {
  protected:
   QNetworkReply* createRequest(Operation op, const QNetworkRequest& request,
                                QIODevice* outgoingData);
+
+ private:
+  static void RecordRequest(const QNetworkRequest& request);
+  static void StaticInit();
+  static void PrintNetworkStatistics();
+
+  static QMutex sMutex;
+  static QMap<QString, int>* sTrafficAnalysis;
 };
 
 class RedirectFollower : public QObject {

src/core/signalhandler.cpp

@@ -0,0 +1,54 @@
+#include "core/signalhandler.h"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/signalfd.h>
+#include <unistd.h>
+
+#include <QByteArray>
+#include <QSocketNotifier>
+
+#include "core/logging.h"
+
+SignalHandler::SignalHandler(QObject* parent)
+    : QObject(parent) {
+  sigset_t mask;
+  memset(&mask, 0, sizeof(mask));
+  sigemptyset(&mask);
+  sigaddset(&mask, SIGUSR1);
+  // Listen to the handled signals in a file descriptor.
+  const int fd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
+  if (fd == -1) {
+    perror(Q_FUNC_INFO);
+    qLog(Fatal) << "Failed to register signal handler with signalfd()";
+  }
+  notifier_ = new QSocketNotifier(fd, QSocketNotifier::Read, this);
+  connect(notifier_, SIGNAL(activated(int)), SLOT(SignalReceived()));
+}
+
+void SignalHandler::SignalReceived() {
+  qLog(Debug) << Q_FUNC_INFO;
+  QByteArray buffer(sizeof(signalfd_siginfo), 0);
+  // read() should fail with EAGAIN if there are no more signals.
+  forever {
+    int bytes_read = read(notifier_->socket(), buffer.data(), buffer.size());
+    if (bytes_read == buffer.size()) {
+      signalfd_siginfo* siginfo =
+          reinterpret_cast<signalfd_siginfo*>(buffer.data());
+      qLog(Debug) << Q_FUNC_INFO
+                  << siginfo->ssi_signo << strsignal(siginfo->ssi_signo);;
+      switch (siginfo->ssi_signo) {
+        case SIGUSR1:
+          emit SIG_USR1();
+          break;
+        // Add more signals here.
+        default:
+          break;
+      }
+    } else if (bytes_read <= 0) {
+      break;
+    }
+  }
+}

src/core/signalhandler.h

@@ -0,0 +1,23 @@
+#ifndef CORE_SIGNALHANDLER_H
+#define CORE_SIGNALHANDLER_H
+
+#include <QObject>
+
+class QSocketNotifier;
+
+class SignalHandler : public QObject {
+  Q_OBJECT
+ public:
+  explicit SignalHandler(QObject* parent = 0);
+
+ signals:
+  void SIG_USR1();
+
+ private slots:
+  void SignalReceived();
+
+ private:
+  QSocketNotifier* notifier_;
+};
+
+#endif  // CORE_SIGNALHANDLER_H

src/core/tagreaderclient.cpp

@@ -27,6 +27,10 @@
 #include <QThread>
 #include <QUrl>
 
+#include "core/waitforsignal.h"
+
+using pb::tagreader::NetworkStatisticsResponse;
+
 const char* TagReaderClient::kWorkerExecutableName = "clementine-tagreader";
 TagReaderClient* TagReaderClient::sInstance = nullptr;
 
@@ -124,6 +128,43 @@ TagReaderReply* TagReaderClient::LoadEmbeddedArt(const QString& filename) {
   return worker_pool_->SendMessageWithReply(&message);
 }
 
+class BroadcastReply : public TagReaderReply {
+ public:
+  BroadcastReply(
+      const pb::tagreader::Message& request_message,
+      const QList<TagReaderReply*>& replies,
+      QObject* parent = nullptr)
+      : TagReaderReply(request_message, parent),
+        replies_(replies) {
+    for (TagReaderReply* reply : replies_) {
+      NewClosure(reply, SIGNAL(Finished(bool)), [=]() {
+        if (IsFinished()) {
+          int successes = std::count_if(
+            replies_.constBegin(), replies_.constEnd(),
+            std::mem_fn(&TagReaderReply::is_successful));
+          emit this->Finished(successes == replies_.count());
+        }
+      });
+    }
+  }
+
+  const QList<TagReaderReply*>& replies() const { return replies_; }
+  bool WaitForFinished() override {
+    WaitForSignal(this, SIGNAL(Finished(bool)));
+    return IsFinished();
+  }
+
+ private:
+  bool IsFinished() const {
+    int finished = std::count_if(
+        replies_.constBegin(), replies_.constEnd(),
+        std::mem_fn(&TagReaderReply::is_finished));
+    return finished == replies_.count();
+  }
+
+  QList<TagReaderReply*> replies_;
+};
+
 TagReaderReply* TagReaderClient::ReadCloudFile(
     const QUrl& download_url, const QString& title, int size,
     const QString& mime_type, const QString& authorisation_header) {
@@ -141,6 +182,45 @@ TagReaderReply* TagReaderClient::ReadCloudFile(
   return worker_pool_->SendMessageWithReply(&message);
 }
 
+TagReaderReply* TagReaderClient::GetNetworkStatistics() {
+  pb::tagreader::Message message;
+  message.mutable_network_statistics_request();
+  QList<TagReaderReply*> replies =
+      worker_pool_->BroadcastMessageWithReply(&message);
+  return new BroadcastReply(message, replies);
+}
+
+void TagReaderClient::GetNetworkStatisticsBlocking() {
+  BroadcastReply* reply = static_cast<BroadcastReply*>(GetNetworkStatistics());
+  reply->WaitForFinished();
+  reply->deleteLater();
+  NetworkStatisticsResponse response;
+  for (TagReaderReply* r : reply->replies()) {
+    response.MergeFrom(r->message().network_statistics_response());
+  }
+
+  // Aggregate stats.
+  QMap<QString, int> requests_by_host;
+  QMap<QString, qint64> bytes_received_by_host;
+  for (const NetworkStatisticsResponse::Entry& entry : response.entry()) {
+    QUrl url(QStringFromStdString(entry.url()));
+    QString host = url.authority();
+    if (requests_by_host.contains(host)) {
+      ++requests_by_host[host];
+    } else {
+      requests_by_host[host] = 1;
+    }
+    if (bytes_received_by_host.contains(host)) {
+      bytes_received_by_host[host] += entry.bytes_received();
+    } else {
+      bytes_received_by_host[host] = entry.bytes_received();
+    }
+  }
+
+  qLog(Debug) << requests_by_host;
+  qLog(Debug) << bytes_received_by_host;
+}
+
 void TagReaderClient::ReadFileBlocking(const QString& filename, Song* song) {
   Q_ASSERT(QThread::currentThread() != thread());
 

src/core/tagreaderclient.h

@@ -53,6 +53,7 @@ class TagReaderClient : public QObject {
   ReplyType* ReadCloudFile(const QUrl& download_url, const QString& title,
                            int size, const QString& mime_type,
                            const QString& authorisation_header);
+  ReplyType* GetNetworkStatistics();
 
   // Convenience functions that call the above functions and wait for a
   // response.  These block the calling thread with a semaphore, and must NOT
@@ -63,6 +64,7 @@ class TagReaderClient : public QObject {
   bool UpdateSongRatingBlocking(const Song& metadata);
   bool IsMediaFileBlocking(const QString& filename);
   QImage LoadEmbeddedArtBlocking(const QString& filename);
+  void GetNetworkStatisticsBlocking();
 
   // TODO(David Sansome): Make this not a singleton
   static TagReaderClient* Instance() { return sInstance; }

src/main.cpp

@@ -16,6 +16,7 @@
 */
 
 #include <memory>
+#include <signal.h>
 
 #include <QtGlobal>
 
@@ -83,6 +84,10 @@
 #include <sys/sysctl.h>
 #endif
 
+#ifdef Q_OS_LINUX
+#include "core/signalhandler.h"
+#endif
+
 #ifdef HAVE_LIBLASTFM
 #include "internet/lastfm/lastfmservice.h"
 #else
@@ -250,6 +255,15 @@ void ScanGIOModulePath() {
 #endif  // HAVE_GIO
 
 int main(int argc, char* argv[]) {
+#ifdef Q_OS_LINUX
+  sigset_t blocked_signals;
+  memset(&blocked_signals, 0, sizeof(blocked_signals));
+  sigemptyset(&blocked_signals);
+  sigaddset(&blocked_signals, SIGUSR1);
+  // This must be done before any other threads are spawned.
+  pthread_sigmask(SIG_BLOCK, &blocked_signals, nullptr);
+#endif
+
   if (CrashReporting::SendCrashReport(argc, argv)) {
     return 0;
   }
@@ -453,6 +467,16 @@ int main(int argc, char* argv[]) {
   app.cover_providers()->AddProvider(new AmazonCoverProvider);
   app.cover_providers()->AddProvider(new MusicbrainzCoverProvider);
 
+#ifdef Q_OS_LINUX
+  SignalHandler signal_handler;
+  NewPermanentClosure(&signal_handler, SIGNAL(SIG_USR1()), [&app]() {
+    qLog(Debug) << "Received SIGUSR1"
+                << "thread: " << QThread::currentThread()
+                << "main thread: " << qApp->thread();
+    app.tag_reader_client()->GetNetworkStatisticsBlocking();
+  });
+#endif
+
 #ifdef Q_OS_LINUX
   // In 11.04 Ubuntu decided that the system tray should be reserved for certain
   // whitelisted applications.  Clementine will override this setting and insert

src/ui/mainwindow.cpp

@@ -846,7 +846,7 @@ MainWindow::MainWindow(Application* app, SystemTrayIcon* tray_icon, OSD* osd,
   connect(ui_->action_kittens, SIGNAL(toggled(bool)), app_->network_remote(),
           SLOT(EnableKittens(bool)));
   // Hide the console
-  // connect(ui_->action_console, SIGNAL(triggered()), SLOT(ShowConsole()));
+  connect(ui_->action_console, SIGNAL(triggered()), SLOT(ShowConsole()));
   NowPlayingWidgetPositionChanged(ui_->now_playing->show_above_status_bar());
 
   // Load theme

src/ui/mainwindow.ui

@@ -461,6 +461,7 @@
     <addaction name="action_hypnotoad"/>
     <addaction name="action_enterprise"/>
     <addaction name="action_kittens"/>
+    <addaction name="action_console"/>
     <addaction name="separator"/>
    </widget>
    <widget class="QMenu" name="menu_tools">