1 files changed, 185 insertions, 0 deletions
diff --git a/src/rocksdb/logging/posix_logger.h b/src/rocksdb/logging/posix_logger.h
new file mode 100644
index 000000000..fbd297c68
--- /dev/null
+++ b/src/rocksdb/logging/posix_logger.h
@@ -0,0 +1,185 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+//
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// Logger implementation that can be shared by all environments
+// where enough posix functionality is available.
+
+#pragma once
+#include <algorithm>
+#include <stdio.h>
+#include "port/sys_time.h"
+#include <time.h>
+#include <fcntl.h>
+
+#ifdef OS_LINUX
+#ifndef FALLOC_FL_KEEP_SIZE
+#include <linux/falloc.h>
+#endif
+#endif
+
+#include <atomic>
+#include "env/io_posix.h"
+#include "monitoring/iostats_context_imp.h"
+#include "rocksdb/env.h"
+#include "test_util/sync_point.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class PosixLogger : public Logger {
+ private:
+  Status PosixCloseHelper() {
+    int ret;
+
+    ret = fclose(file_);
+    if (ret) {
+      return IOError("Unable to close log file", "", ret);
+    }
+    return Status::OK();
+  }
+  FILE* file_;
+  uint64_t (*gettid_)();  // Return the thread id for the current thread
+  std::atomic_size_t log_size_;
+  int fd_;
+  const static uint64_t flush_every_seconds_ = 5;
+  std::atomic_uint_fast64_t last_flush_micros_;
+  Env* env_;
+  std::atomic<bool> flush_pending_;
+
+ protected:
+  virtual Status CloseImpl() override { return PosixCloseHelper(); }
+
+ public:
+  PosixLogger(FILE* f, uint64_t (*gettid)(), Env* env,
+              const InfoLogLevel log_level = InfoLogLevel::ERROR_LEVEL)
+      : Logger(log_level),
+        file_(f),
+        gettid_(gettid),
+        log_size_(0),
+        fd_(fileno(f)),
+        last_flush_micros_(0),
+        env_(env),
+        flush_pending_(false) {}
+  virtual ~PosixLogger() {
+    if (!closed_) {
+      closed_ = true;
+      PosixCloseHelper();
+    }
+  }
+  virtual void Flush() override {
+    TEST_SYNC_POINT("PosixLogger::Flush:Begin1");
+    TEST_SYNC_POINT("PosixLogger::Flush:Begin2");
+    if (flush_pending_) {
+      flush_pending_ = false;
+      fflush(file_);
+    }
+    last_flush_micros_ = env_->NowMicros();
+  }
+
+  using Logger::Logv;
+  virtual void Logv(const char* format, va_list ap) override {
+    IOSTATS_TIMER_GUARD(logger_nanos);
+
+    const uint64_t thread_id = (*gettid_)();
+
+    // We try twice: the first time with a fixed-size stack allocated buffer,
+    // and the second time with a much larger dynamically allocated buffer.
+    char buffer[500];
+    for (int iter = 0; iter < 2; iter++) {
+      char* base;
+      int bufsize;
+      if (iter == 0) {
+        bufsize = sizeof(buffer);
+        base = buffer;
+      } else {
+        bufsize = 65536;
+        base = new char[bufsize];
+      }
+      char* p = base;
+      char* limit = base + bufsize;
+
+      struct timeval now_tv;
+      gettimeofday(&now_tv, nullptr);
+      const time_t seconds = now_tv.tv_sec;
+      struct tm t;
+      localtime_r(&seconds, &t);
+      p += snprintf(p, limit - p,
+                    "%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));
+
+      // Print the message
+      if (p < limit) {
+        va_list backup_ap;
+        va_copy(backup_ap, ap);
+        p += vsnprintf(p, limit - p, format, backup_ap);
+        va_end(backup_ap);
+      }
+
+      // Truncate to available space if necessary
+      if (p >= limit) {
+        if (iter == 0) {
+          continue;       // Try again with larger buffer
+        } else {
+          p = limit - 1;
+        }
+      }
+
+      // Add newline if necessary
+      if (p == base || p[-1] != '\n') {
+        *p++ = '\n';
+      }
+
+      assert(p <= limit);
+      const size_t write_size = p - base;
+
+#ifdef ROCKSDB_FALLOCATE_PRESENT
+      const int kDebugLogChunkSize = 128 * 1024;
+
+      // If this write would cross a boundary of kDebugLogChunkSize
+      // space, pre-allocate more space to avoid overly large
+      // allocations from filesystem allocsize options.
+      const size_t log_size = log_size_;
+      const size_t last_allocation_chunk =
+        ((kDebugLogChunkSize - 1 + log_size) / kDebugLogChunkSize);
+      const size_t desired_allocation_chunk =
+        ((kDebugLogChunkSize - 1 + log_size + write_size) /
+           kDebugLogChunkSize);
+      if (last_allocation_chunk != desired_allocation_chunk) {
+        fallocate(
+            fd_, FALLOC_FL_KEEP_SIZE, 0,
+            static_cast<off_t>(desired_allocation_chunk * kDebugLogChunkSize));
+      }
+#endif
+
+      size_t sz = fwrite(base, 1, write_size, file_);
+      flush_pending_ = true;
+      if (sz > 0) {
+        log_size_ += write_size;
+      }
+      uint64_t now_micros = static_cast<uint64_t>(now_tv.tv_sec) * 1000000 +
+        now_tv.tv_usec;
+      if (now_micros - last_flush_micros_ >= flush_every_seconds_ * 1000000) {
+        Flush();
+      }
+      if (base != buffer) {
+        delete[] base;
+      }
+      break;
+    }
+  }
+  size_t GetLogFileSize() const override { return log_size_; }
+};
+
+}  // namespace ROCKSDB_NAMESPACE