db_bench -use_stderr_info_logger to print timestamp (#10435)

Summary:
Right now db_bench -use_stderr_info_logger would redirect RocksDB info logging to stderr but no timetamp is printed out. Add timestamp to there.

Pull Request resolved: facebook/rocksdb#10435

Test Plan: Run "db_bench -use_stderr_info_logger"

Reviewed By: riversand963

Differential Revision: D38258699

fbshipit-source-id: 3fee6eb1205127b923bc6a660f86bd2742519aec

util/stderr_logger.h

@@ -8,6 +8,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#include "port/sys_time.h"
 #include "rocksdb/env.h"
 
 namespace ROCKSDB_NAMESPACE {
@@ -23,6 +24,18 @@ class StderrLogger : public Logger {
   using Logger::Logv;
 
   virtual void Logv(const char* format, va_list ap) override {
+    const uint64_t thread_id = Env::Default()->GetThreadID();
+
+    port::TimeVal now_tv;
+    port::GetTimeOfDay(&now_tv, nullptr);
+    const time_t seconds = now_tv.tv_sec;
+    struct tm t;
+    port::LocalTimeR(&seconds, &t);
+    fprintf(stderr, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
+            t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,
+            t.tm_sec, static_cast<int>(now_tv.tv_usec),
+            static_cast<long long unsigned int>(thread_id));
+
     vfprintf(stderr, format, ap);
     fprintf(stderr, "\n");
   }