Improve logging

OptiScaler/nvapi/fakenvapi/log.cpp

@@ -1,39 +1,59 @@
 #include "log.h"
 #include <fstream>
+#include <format>
 
-std::ofstream logFileStream;
+std::ostream null(nullptr);
+std::ostream* logStream = &null;
+std::ofstream fileStream;
+
+std::string getCurrentTimeFormatted() {
+    auto now = std::chrono::system_clock::now();
+    auto now_t = std::chrono::system_clock::to_time_t(now);
+    auto now_tm = *std::localtime(&now_t);
+    auto now_duration = now - std::chrono::system_clock::from_time_t(std::mktime(&now_tm));
+    auto now_us = std::chrono::duration_cast<std::chrono::microseconds>(now_duration);
+    std::ostringstream oss;
+    oss << std::setfill('0') << std::setw(2) << now_tm.tm_hour << ":"
+        << std::setfill('0') << std::setw(2) << now_tm.tm_min << ":"
+        << std::setfill('0') << std::setw(2) << now_tm.tm_sec << "."
+        << std::setfill('0') << std::setw(6) << now_us.count();
+
+    return oss.str();
+}
+
+void log(const std::string& log) {
+    *logStream << "[" << getCurrentTimeFormatted() << "] " << log << std::endl;
+}
 
 NvAPI_Status Ok(const std::source_location& location) {
-    log_time();
-    logFileStream << location.function_name() << ": OK" << std::endl;
+    log(std::format("{}: {}", location.function_name(), "OK"));
     return NVAPI_OK;
 }
 
 NvAPI_Status Error(const std::source_location& location) {
-    log_time();
-    logFileStream << location.function_name() << ": Error" << std::endl;
+    log(std::format("{}: {}", location.function_name(), "Error"));
     return NVAPI_ERROR;
 }
 
 NvAPI_Status Error(NvAPI_Status status, const std::source_location& location) {
-    log_time();
-    logFileStream << location.function_name() << ": " << status << std::endl;
+    log(std::format("{}: {}", location.function_name(), std::to_string(status)));
     return status;
 }
 
-void log_time() {
-    logFileStream << std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count() << ": ";
-}
-
-void log(std::string log) {
-    log_time();
-    logFileStream << log << std::endl;
-}
-
-void prepareLogging(std::string fileName) {
-    logFileStream = std::ofstream(fileName, std::ios_base::out | std::ios_base::app);
+void prepareLogging(std::optional<std::string> fileName) {
+    if (fileName.has_value()) {
+        fileStream.open(fileName.value(), std::ios_base::out | std::ios_base::app);
+        if (fileStream.is_open()) {
+            logStream = &fileStream;
+            return;
+        }
+        else {
+            std::cerr << "Failed to open log file: " << fileName.value() << std::endl;
+        }
+    }
+    // logStream = &std::cout;
 }
 
 void closeLogging() {
-    logFileStream.close();
+    fileStream.close();
 }

OptiScaler/nvapi/fakenvapi/log.h

@@ -6,10 +6,10 @@
 #include <source_location>
 #include "../include/nvapi.h"
 
-void log_time();
-void log(std::string log);
-void prepareLogging(std::string fileName);
+std::string getCurrentTimeFormatted();
+void log(const std::string& log);
+NvAPI_Status Ok(const std::source_location &location = std::source_location::current());
+NvAPI_Status Error(const std::source_location &location = std::source_location::current());
+NvAPI_Status Error(NvAPI_Status status, const std::source_location &location = std::source_location::current());
+void prepareLogging(std::optional<std::string> fileName);
 void closeLogging();
-NvAPI_Status Ok(const std::source_location& location = std::source_location::current());
-NvAPI_Status Error(const std::source_location& location = std::source_location::current());
-NvAPI_Status Error(NvAPI_Status status, const std::source_location& location = std::source_location::current());

OptiScaler/nvapi/fakenvapi/main.cpp

@@ -16,9 +16,13 @@
 #include "log.h"
 
 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
+    auto logEnv = std::getenv("NVAPI_LOG");
     switch (fdwReason) {
     case DLL_PROCESS_ATTACH:
-        prepareLogging("nvapi-dummy.log");
+        if (logEnv && *logEnv == '1')
+            prepareLogging("nvapi-dummy.log");
+        else
+            prepareLogging(std::nullopt);
         log("--------------");
         break;
     case DLL_PROCESS_DETACH: