1 files changed, 123 insertions, 0 deletions
diff --git a/src/rocksdb/db/db_info_dumper.cc b/src/rocksdb/db/db_info_dumper.cc
new file mode 100644
index 000000000..7008ca6ff
--- /dev/null
+++ b/src/rocksdb/db/db_info_dumper.cc
@@ -0,0 +1,123 @@
+//  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).
+
+#include "db/db_info_dumper.h"
+
+#include <stdio.h>
+#include <algorithm>
+#include <cinttypes>
+#include <string>
+#include <vector>
+
+#include "file/filename.h"
+#include "rocksdb/env.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+void DumpDBFileSummary(const ImmutableDBOptions& options,
+                       const std::string& dbname) {
+  if (options.info_log == nullptr) {
+    return;
+  }
+
+  auto* env = options.env;
+  uint64_t number = 0;
+  FileType type = kInfoLogFile;
+
+  std::vector<std::string> files;
+  uint64_t file_num = 0;
+  uint64_t file_size;
+  std::string file_info, wal_info;
+
+  Header(options.info_log, "DB SUMMARY\n");
+  // Get files in dbname dir
+  if (!env->GetChildren(dbname, &files).ok()) {
+    Error(options.info_log,
+          "Error when reading %s dir\n", dbname.c_str());
+  }
+  std::sort(files.begin(), files.end());
+  for (const std::string& file : files) {
+    if (!ParseFileName(file, &number, &type)) {
+      continue;
+    }
+    switch (type) {
+      case kCurrentFile:
+        Header(options.info_log, "CURRENT file:  %s\n", file.c_str());
+        break;
+      case kIdentityFile:
+        Header(options.info_log, "IDENTITY file:  %s\n", file.c_str());
+        break;
+      case kDescriptorFile:
+        env->GetFileSize(dbname + "/" + file, &file_size);
+        Header(options.info_log, "MANIFEST file:  %s size: %" PRIu64 " Bytes\n",
+               file.c_str(), file_size);
+        break;
+      case kLogFile:
+        env->GetFileSize(dbname + "/" + file, &file_size);
+        char str[16];
+        snprintf(str, sizeof(str), "%" PRIu64, file_size);
+        wal_info.append(file).append(" size: ").
+            append(str).append(" ; ");
+        break;
+      case kTableFile:
+        if (++file_num < 10) {
+          file_info.append(file).append(" ");
+        }
+        break;
+      default:
+        break;
+    }
+  }
+
+  // Get sst files in db_path dir
+  for (auto& db_path : options.db_paths) {
+    if (dbname.compare(db_path.path) != 0) {
+      if (!env->GetChildren(db_path.path, &files).ok()) {
+        Error(options.info_log,
+            "Error when reading %s dir\n",
+            db_path.path.c_str());
+        continue;
+      }
+      std::sort(files.begin(), files.end());
+      for (const std::string& file : files) {
+        if (ParseFileName(file, &number, &type)) {
+          if (type == kTableFile && ++file_num < 10) {
+            file_info.append(file).append(" ");
+          }
+        }
+      }
+    }
+    Header(options.info_log,
+           "SST files in %s dir, Total Num: %" PRIu64 ", files: %s\n",
+           db_path.path.c_str(), file_num, file_info.c_str());
+    file_num = 0;
+    file_info.clear();
+  }
+
+  // Get wal file in wal_dir
+  if (dbname.compare(options.wal_dir) != 0) {
+    if (!env->GetChildren(options.wal_dir, &files).ok()) {
+      Error(options.info_log,
+          "Error when reading %s dir\n",
+          options.wal_dir.c_str());
+      return;
+    }
+    wal_info.clear();
+    for (const std::string& file : files) {
+      if (ParseFileName(file, &number, &type)) {
+        if (type == kLogFile) {
+          env->GetFileSize(options.wal_dir + "/" + file, &file_size);
+          char str[16];
+          snprintf(str, sizeof(str), "%" PRIu64, file_size);
+          wal_info.append(file).append(" size: ").
+              append(str).append(" ; ");
+        }
+      }
+    }
+  }
+  Header(options.info_log, "Write Ahead Log file in %s: %s\n",
+         options.wal_dir.c_str(), wal_info.c_str());
+}
+}  // namespace ROCKSDB_NAMESPACE