mirror of https://github.com/facebook/rocksdb.git
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
// Copyright (c) Meta Platforms, Inc. and affiliates.
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//
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "util/stderr_logger.h"
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#include "port/malloc.h"
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#include "port/sys_time.h"
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namespace ROCKSDB_NAMESPACE {
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StderrLogger::~StderrLogger() {
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if (log_prefix != nullptr) {
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free((void*)log_prefix);
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}
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}
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void StderrLogger::Logv(const char* format, va_list ap) {
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const uint64_t thread_id = Env::Default()->GetThreadID();
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port::TimeVal now_tv;
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port::GetTimeOfDay(&now_tv, nullptr);
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const time_t seconds = now_tv.tv_sec;
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struct tm t;
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port::LocalTimeR(&seconds, &t);
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// The string we eventually log has three parts: the context (time, thread),
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// optional user-supplied prefix, and the actual log message (the "suffix").
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//
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// We compute their lengths so that we can allocate a buffer big enough to
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// print it. The context string (with the date and thread id) is really only
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// 44 bytes, but we allocate 50 to be safe.
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//
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// ctx_len = 44 = ( 4+ 1+ 2+1+2+ 1+2+ 1+2+ 1+ 2+1+6+ 1+16+1)
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const char* ctx_prefix_fmt = "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx %s";
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size_t ctx_len = 50;
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va_list ap_copy;
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va_copy(ap_copy, ap);
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const size_t log_suffix_len = vsnprintf(nullptr, 0, format, ap_copy) + 1;
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va_end(ap_copy);
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// Allocate space for the context, log_prefix, and log itself
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// Extra byte for null termination
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size_t buf_len = ctx_len + log_prefix_len + log_suffix_len;
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std::unique_ptr<char[]> buf(new char[buf_len]);
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// If the logger was created without a prefix, the prefix is a nullptr
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const char* prefix = log_prefix == nullptr ? "" : log_prefix;
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// Write out the context and prefix string
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int written =
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snprintf(buf.get(), ctx_len + log_prefix_len, ctx_prefix_fmt,
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t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,
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t.tm_sec, static_cast<int>(now_tv.tv_usec),
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static_cast<long long unsigned int>(thread_id), prefix);
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vsnprintf(buf.get() + written, log_suffix_len, format, ap);
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fprintf(stderr, "%s%c", buf.get(), '\n');
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}
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} // namespace ROCKSDB_NAMESPACE
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