dolphin/Source/Core/Common/Analytics.cpp
Lioncash 7935c27b52 Common/Analytics: Convert std::string overload into std::string_view
Allows for both string types to be non-allocating. We can't remove the
const char* overload in this case due to the fact that pointers can
implicitly convert to bool, so if we removed the overload all const
char arrays passed in would begin executing the bool overload instead of
the string_view overload, which is definitely not what we want to occur.
2019-06-05 13:24:31 -04:00

217 lines
5.2 KiB
C++

// Copyright 2016 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <cmath>
#include <cstdio>
#include <string>
#include <type_traits>
#include "Common/Analytics.h"
#include "Common/CommonTypes.h"
#include "Common/StringUtil.h"
#include "Common/Thread.h"
namespace Common
{
namespace
{
// Format version number, used as the first byte of every report sent.
// Increment for any change to the wire format.
constexpr u8 WIRE_FORMAT_VERSION = 1;
// Identifiers for the value types supported by the analytics reporting wire
// format.
enum class TypeId : u8
{
STRING = 0,
BOOL = 1,
UINT = 2,
SINT = 3,
FLOAT = 4,
// Flags which can be combined with other types.
ARRAY = 0x80,
};
TypeId operator|(TypeId l, TypeId r)
{
using ut = std::underlying_type_t<TypeId>;
return static_cast<TypeId>(static_cast<ut>(l) | static_cast<ut>(r));
}
void AppendBool(std::string* out, bool v)
{
out->push_back(v ? '\xFF' : '\x00');
}
void AppendVarInt(std::string* out, u64 v)
{
do
{
u8 current_byte = v & 0x7F;
v >>= 7;
current_byte |= (!!v) << 7;
out->push_back(current_byte);
} while (v);
}
void AppendBytes(std::string* out, const u8* bytes, u32 length, bool encode_length = true)
{
if (encode_length)
{
AppendVarInt(out, length);
}
out->append(reinterpret_cast<const char*>(bytes), length);
}
void AppendType(std::string* out, TypeId type)
{
out->push_back(static_cast<u8>(type));
}
} // namespace
AnalyticsReportBuilder::AnalyticsReportBuilder()
{
m_report.push_back(WIRE_FORMAT_VERSION);
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, std::string_view v)
{
AppendType(report, TypeId::STRING);
AppendBytes(report, reinterpret_cast<const u8*>(v.data()), static_cast<u32>(v.size()));
}
// We can't remove this overload despite the string_view overload due to the fact that
// pointers can implicitly convert to bool, so if we removed the overload, then all
// const char strings passed in would begin forwarding to the bool overload,
// which is definitely not what we want to occur.
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, const char* v)
{
AppendSerializedValue(report, std::string_view(v));
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, bool v)
{
AppendType(report, TypeId::BOOL);
AppendBool(report, v);
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, u64 v)
{
AppendType(report, TypeId::UINT);
AppendVarInt(report, v);
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, s64 v)
{
AppendType(report, TypeId::SINT);
AppendBool(report, v >= 0);
AppendVarInt(report, static_cast<u64>(std::abs(v)));
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, u32 v)
{
AppendSerializedValue(report, static_cast<u64>(v));
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, s32 v)
{
AppendSerializedValue(report, static_cast<s64>(v));
}
void AnalyticsReportBuilder::AppendSerializedValue(std::string* report, float v)
{
AppendType(report, TypeId::FLOAT);
AppendBytes(report, reinterpret_cast<u8*>(&v), sizeof(v), false);
}
void AnalyticsReportBuilder::AppendSerializedValueVector(std::string* report,
const std::vector<u32>& v)
{
AppendType(report, TypeId::UINT | TypeId::ARRAY);
AppendVarInt(report, v.size());
for (u32 x : v)
AppendVarInt(report, x);
}
AnalyticsReporter::AnalyticsReporter()
{
m_reporter_thread = std::thread(&AnalyticsReporter::ThreadProc, this);
}
AnalyticsReporter::~AnalyticsReporter()
{
// Set the exit request flag and wait for the thread to honor it.
m_reporter_stop_request.Set();
m_reporter_event.Set();
m_reporter_thread.join();
}
void AnalyticsReporter::Send(AnalyticsReportBuilder&& report)
{
#if defined(USE_ANALYTICS) && USE_ANALYTICS
// Put a bound on the size of the queue to avoid uncontrolled memory growth.
constexpr u32 QUEUE_SIZE_LIMIT = 25;
if (m_reports_queue.Size() < QUEUE_SIZE_LIMIT)
{
m_reports_queue.Push(report.Consume());
m_reporter_event.Set();
}
#endif
}
void AnalyticsReporter::ThreadProc()
{
Common::SetCurrentThreadName("Analytics");
while (true)
{
m_reporter_event.Wait();
if (m_reporter_stop_request.IsSet())
{
return;
}
while (!m_reports_queue.Empty())
{
std::shared_ptr<AnalyticsReportingBackend> backend(m_backend);
if (backend)
{
std::string report;
m_reports_queue.Pop(report);
backend->Send(std::move(report));
}
else
{
break;
}
// Recheck after each report sent.
if (m_reporter_stop_request.IsSet())
{
return;
}
}
}
}
void StdoutAnalyticsBackend::Send(std::string report)
{
printf("Analytics report sent:\n%s",
HexDump(reinterpret_cast<const u8*>(report.data()), report.size()).c_str());
}
HttpAnalyticsBackend::HttpAnalyticsBackend(std::string endpoint) : m_endpoint(std::move(endpoint))
{
}
HttpAnalyticsBackend::~HttpAnalyticsBackend() = default;
void HttpAnalyticsBackend::Send(std::string report)
{
if (m_http.IsValid())
m_http.Post(m_endpoint, report);
}
} // namespace Common