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Reduce log overhead when logging disabled #711

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Reduce log overhead when logging disabled #711

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a451784
Prototype to reduce log overhead
isaacl Aug 2, 2024
d5fce7b
Add debug guess for NSLog
isaacl Aug 2, 2024
3ff32d8
Update AppleLogger.mm
isaacl Aug 2, 2024
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4 changes: 2 additions & 2 deletions package/android/src/main/cpp/AndroidLogger.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,9 @@
#include "MmkvLogger.h"
#include <android/log.h>

void MmkvLogger::log(const std::string& tag, const std::string& message) {
void MmkvLogger::log(const std::string& tag, const std::string& formatString, Args... args) {
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same here, not a template.

we can't even template this because our implementation is in two differnt spots (ios and android). so we might not be able to support Args....

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-security"
__android_log_print(ANDROID_LOG_INFO, tag.c_str(), message.c_str());
__android_log_print(ANDROID_LOG_INFO, tag.c_str(), formatString.c_str(), args);
#pragma clang diagnostic pop
}
17 changes: 2 additions & 15 deletions package/cpp/MmkvLogger.h
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Expand Up @@ -11,25 +11,12 @@ class MmkvLogger {
private:
MmkvLogger() = delete;

private:
template <typename... Args>
static std::string string_format(const std::string& format, Args... args) {
int size_s = std::snprintf(nullptr, 0, format.c_str(), args...) + 1; // Extra space for '\0'
if (size_s <= 0) {
throw std::runtime_error("Failed to format string!");
}
auto size = static_cast<size_t>(size_s);
std::unique_ptr<char[]> buf(new char[size]);
std::snprintf(buf.get(), size, format.c_str(), args...);
return std::string(buf.get(), buf.get() + size - 1); // We don't want the '\0' inside
}

public:
static void log(const std::string& tag, const std::string& message);
static void log(const std::string& tag, const std::string& formatString, Args... args);
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This is not a template, you cannot use Args... here. This is why the C++ build is now failing.

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yes, I understand, but I ended up not using this project for my work, so I don't have time to fully flesh out this patch. I was intending to simply illustrate some ways of avoiding the logging overhead and/or avoiding NSLog in release builds (which is discouraged)


template <typename... Args>
inline static void log(const std::string& tag, const std::string& formatString, Args&&... args) {
std::string formattedString = string_format(formatString, std::forward<Args>(args)...);
log(tag, formattedString);
log(tag, formatString, std::forward<Args>(args)...);
}
};
6 changes: 4 additions & 2 deletions package/ios/AppleLogger.mm
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Expand Up @@ -8,9 +8,11 @@
#import "MmkvLogger.h"
#import <Foundation/Foundation.h>

void MmkvLogger::log(const std::string& tag, const std::string& message) {
void MmkvLogger::log(const std::string& tag, const std::string& formatString, Args... args) {
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same here, not a template.

we can't even template this because our implementation is in two differnt spots (ios and android). so we might not be able to support Args....

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-security"
NSLog(@"[%s]: %s", tag.c_str(), message.c_str());
if (NSDebugEnabled) {
NSLog(@"[%s]: " + formatString.c_str(), tag.c_str(), args);
}
#pragma clang diagnostic pop
}