Refactor logging to use util::logf and add log utility header

src/util/hex.cc

@@ -2,7 +2,7 @@
 
 #include <string>
 
-#include "absl/strings/str_cat"
+#include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/str_join.h"
 

src/util/hex.h

@@ -2,6 +2,7 @@
 #define YAZE_UTIL_HEX_H
 
 #include <cstdint>
+#include <string>
 
 namespace yaze {
 namespace util {
@@ -17,4 +18,6 @@ std::string HexLong(uint32_t dword, HexStringParams params = {});
 std::string HexLongLong(uint64_t qword, HexStringParams params = {});
 
 }  // namespace util
-}  // namespace yaze
+}  // namespace yaze
+
+#endif

src/util/log.h

@@ -0,0 +1,36 @@
+#ifndef YAZE_UTIL_LOG_H
+#define YAZE_UTIL_LOG_H
+
+#include <chrono>
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+
+namespace yaze {
+namespace util {
+
+static const std::string kLogFileOut = "yaze_log.txt";
+
+template <typename... Args>
+static void logf(const absl::FormatSpec<Args...> &format, const Args &...args) {
+  std::string message = absl::StrFormat(format, args...);
+  auto timestamp = std::chrono::system_clock::now();
+
+  std::time_t now_tt = std::chrono::system_clock::to_time_t(timestamp);
+  std::tm tm = *std::localtime(&now_tt);
+  message = absl::StrCat("[", tm.tm_hour, ":", tm.tm_min, ":", tm.tm_sec, "] ",
+                         message, "\n");
+
+  if (ExperimentFlags::get().kLogToConsole) {
+    std::cout << message;
+  }
+  static std::ofstream fout(kLogFileOut, std::ios::out | std::ios::app);
+  fout << message;
+}
+
+}  // namespace util
+}  // namespace yaze