6 files changed, 104 insertions, 0 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index c733e5d21..57504529f 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -174,6 +174,7 @@ set(SRCS
             memory.cpp
             perf_stats.cpp
             settings.cpp
+            telemetry_session.cpp
             )
 
 set(HEADERS
@@ -366,6 +367,7 @@ set(HEADERS
             mmio.h
             perf_stats.h
             settings.h
+            telemetry_session.h
             )
 
 include_directories(../../externals/dynarmic/include)
diff --git a/src/core/core.cpp b/src/core/core.cpp
index 881f1e93c..450e7566d 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -132,6 +132,8 @@ System::ResultStatus System::Init(EmuWindow* emu_window, u32 system_mode) {
         cpu_core = std::make_unique<ARM_DynCom>(USER32MODE);
     }
 
+    telemetry_session = std::make_unique<Core::TelemetrySession>();
+
     CoreTiming::Init();
     HW::Init();
     Kernel::Init(system_mode);
@@ -162,6 +164,7 @@ void System::Shutdown() {
     CoreTiming::Shutdown();
     cpu_core = nullptr;
     app_loader = nullptr;
+    telemetry_session = nullptr;
 
     LOG_DEBUG(Core, "Shutdown OK");
 }
diff --git a/src/core/core.h b/src/core/core.h
index 6c9c936b5..6af772831 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -9,6 +9,7 @@
 #include "common/common_types.h"
 #include "core/memory.h"
 #include "core/perf_stats.h"
+#include "core/telemetry_session.h"
 
 class EmuWindow;
 class ARM_Interface;
@@ -80,6 +81,14 @@ public:
         return cpu_core != nullptr;
     }
 
+    /**
+     * Returns a reference to the telemetry session for this emulation session.
+     * @returns Reference to the telemetry session.
+     */
+    Core::TelemetrySession& TelemetrySession() const {
+        return *telemetry_session;
+    }
+
     /// Prepare the core emulation for a reschedule
     void PrepareReschedule();
 
@@ -117,6 +126,9 @@ private:
     /// When true, signals that a reschedule should happen
     bool reschedule_pending{};
 
+    /// Telemetry session for this emulation session
+    std::unique_ptr<Core::TelemetrySession> telemetry_session;
+
     static System s_instance;
 };
 
@@ -124,4 +136,8 @@ inline ARM_Interface& CPU() {
     return System::GetInstance().CPU();
 }
 
+inline TelemetrySession& Telemetry() {
+    return System::GetInstance().TelemetrySession();
+}
+
 } // namespace Core
diff --git a/src/core/loader/ncch.cpp b/src/core/loader/ncch.cpp
index 1a4e3efa8..beeb13ffa 100644
--- a/src/core/loader/ncch.cpp
+++ b/src/core/loader/ncch.cpp
@@ -9,6 +9,7 @@
 #include "common/logging/log.h"
 #include "common/string_util.h"
 #include "common/swap.h"
+#include "core/core.h"
 #include "core/file_sys/archive_selfncch.h"
 #include "core/hle/kernel/process.h"
 #include "core/hle/kernel/resource_limit.h"
@@ -339,6 +340,8 @@ ResultStatus AppLoader_NCCH::Load() {
 
     LOG_INFO(Loader, "Program ID: %016" PRIX64, ncch_header.program_id);
 
+    Core::Telemetry().AddField(Telemetry::FieldType::Session, "ProgramId", ncch_header.program_id);
+
     is_loaded = true; // Set state to loaded
 
     result = LoadExec(); // Load the executable into memory for booting
diff --git a/src/core/telemetry_session.cpp b/src/core/telemetry_session.cpp
new file mode 100644
index 000000000..ddc8b262e
--- /dev/null
+++ b/src/core/telemetry_session.cpp
@@ -0,0 +1,42 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstring>
+
+#include "common/scm_rev.h"
+#include "core/telemetry_session.h"
+
+namespace Core {
+
+TelemetrySession::TelemetrySession() {
+    // TODO(bunnei): Replace with a backend that logs to our web service
+    backend = std::make_unique<Telemetry::NullVisitor>();
+
+    // Log one-time session start information
+    const auto duration{std::chrono::steady_clock::now().time_since_epoch()};
+    const auto start_time{std::chrono::duration_cast<std::chrono::microseconds>(duration).count()};
+    AddField(Telemetry::FieldType::Session, "StartTime", start_time);
+
+    // Log one-time application information
+    const bool is_git_dirty{std::strstr(Common::g_scm_desc, "dirty") != nullptr};
+    AddField(Telemetry::FieldType::App, "GitIsDirty", is_git_dirty);
+    AddField(Telemetry::FieldType::App, "GitBranch", Common::g_scm_branch);
+    AddField(Telemetry::FieldType::App, "GitRevision", Common::g_scm_rev);
+}
+
+TelemetrySession::~TelemetrySession() {
+    // Log one-time session end information
+    const auto duration{std::chrono::steady_clock::now().time_since_epoch()};
+    const auto end_time{std::chrono::duration_cast<std::chrono::microseconds>(duration).count()};
+    AddField(Telemetry::FieldType::Session, "EndTime", end_time);
+
+    // Complete the session, submitting to web service if necessary
+    // This is just a placeholder to wrap up the session once the core completes and this is
+    // destroyed. This will be moved elsewhere once we are actually doing real I/O with the service.
+    field_collection.Accept(*backend);
+    backend->Complete();
+    backend = nullptr;
+}
+
+} // namespace Core
diff --git a/src/core/telemetry_session.h b/src/core/telemetry_session.h
new file mode 100644
index 000000000..cf53835c3
--- /dev/null
+++ b/src/core/telemetry_session.h
@@ -0,0 +1,38 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "common/telemetry.h"
+
+namespace Core {
+
+/**
+ * Instruments telemetry for this emulation session. Creates a new set of telemetry fields on each
+ * session, logging any one-time fields. Interfaces with the telemetry backend used for submitting
+ * data to the web service. Submits session data on close.
+ */
+class TelemetrySession : NonCopyable {
+public:
+    TelemetrySession();
+    ~TelemetrySession();
+
+    /**
+     * Wrapper around the Telemetry::FieldCollection::AddField method.
+     * @param type Type of the field to add.
+     * @param name Name of the field to add.
+     * @param value Value for the field to add.
+     */
+    template <typename T>
+    void AddField(Telemetry::FieldType type, const char* name, T value) {
+        field_collection.AddField(type, name, std::move(value));
+    }
+
+private:
+    Telemetry::FieldCollection field_collection; ///< Tracks all added fields for the session
+    std::unique_ptr<Telemetry::VisitorInterface> backend; ///< Backend interface that logs fields
+};
+
+} // namespace Core