Disable info log by default and add infoLogLevel option (#114)

.gitignore

@@ -20,3 +20,4 @@ prebuilds/
 yarn.lock
 package-lock.json
 .nyc_output/
+.benchmarks/

.npmignore

@@ -42,6 +42,7 @@ libleveldb.a
 # Benchmarks and tests
 bench/
 test/
+.benchmarks/
 *.csv
 
 # Misc

README.md

@@ -55,6 +55,7 @@ If you don't want to use the prebuilt binary for the platform you are installing
 Please refer to [`leveldown`](https://github.com/Level/leveldown#api) for API documentation. The `db.open(options, callback)` method of `rocksdb` has a few additional options:
 
 - `readOnly` (boolean, default `false`): open database in read-only mode.
+- `infoLogLevel` (string, default `null`): verbosity of info log. One of `'debug'`, `'info'`, `'warn'`, `'error'`, `'fatal'`, `'header'` or `null` (disable).
 
 ## Contributing
 

binding.cc

@@ -8,7 +8,6 @@
 #include <rocksdb/write_batch.h>
 #include <rocksdb/cache.h>
 #include <rocksdb/filter_policy.h>
-#include <rocksdb/utilities/leveldb_options.h>
 #include <rocksdb/cache.h>
 #include <rocksdb/comparator.h>
 #include <rocksdb/env.h>
@@ -20,6 +19,13 @@ namespace leveldb = rocksdb;
 #include <map>
 #include <vector>
 
+class NullLogger : public rocksdb::Logger {
+public:
+  using rocksdb::Logger::Logv;
+  virtual void Logv(const char* format, va_list ap) override {}
+  virtual size_t GetLogFileSize() const override { return 0; }
+};
+
 /**
  * Forward declarations.
  */
@@ -777,6 +783,7 @@ struct OpenWorker final : public BaseWorker {
               uint32_t blockRestartInterval,
               uint32_t maxFileSize,
               uint32_t cacheSize,
+              const std::string& infoLogLevel,
               bool readOnly)
     : BaseWorker(env, database, callback, "leveldown.db.open"),
       readOnly_(readOnly),
@@ -790,7 +797,25 @@ struct OpenWorker final : public BaseWorker {
     options_.max_open_files = maxOpenFiles;
     options_.max_log_file_size = maxFileSize;
     options_.paranoid_checks = false;
-    options_.info_log_level = rocksdb::InfoLogLevel::WARN_LEVEL;
+
+    if (infoLogLevel.size() > 0) {
+      rocksdb::InfoLogLevel lvl;
+
+      if (infoLogLevel == "debug") lvl = rocksdb::InfoLogLevel::DEBUG_LEVEL;
+      else if (infoLogLevel == "info") lvl = rocksdb::InfoLogLevel::INFO_LEVEL;
+      else if (infoLogLevel == "warn") lvl = rocksdb::InfoLogLevel::WARN_LEVEL;
+      else if (infoLogLevel == "error") lvl = rocksdb::InfoLogLevel::ERROR_LEVEL;
+      else if (infoLogLevel == "fatal") lvl = rocksdb::InfoLogLevel::FATAL_LEVEL;
+      else if (infoLogLevel == "header") lvl = rocksdb::InfoLogLevel::HEADER_LEVEL;
+      else napi_throw_error(env_, NULL, "invalid log level");
+
+      options_.info_log_level = lvl;
+    } else {
+      // In some places RocksDB checks this option to see if it should prepare
+      // debug information (ahead of logging), so set it to the highest level.
+      options_.info_log_level = rocksdb::InfoLogLevel::HEADER_LEVEL;
+      options_.info_log.reset(new NullLogger());
+    }
 
     rocksdb::BlockBasedTableOptions tableOptions;
 
@@ -834,6 +859,8 @@ NAPI_METHOD(db_open) {
   bool compression = BooleanProperty(env, options, "compression", true);
   bool readOnly = BooleanProperty(env, options, "readOnly", false);
 
+  std::string infoLogLevel = StringProperty(env, options, "infoLogLevel");
+
   uint32_t cacheSize = Uint32Property(env, options, "cacheSize", 8 << 20);
   uint32_t writeBufferSize = Uint32Property(env, options , "writeBufferSize" , 4 << 20);
   uint32_t blockSize = Uint32Property(env, options, "blockSize", 4096);
@@ -847,7 +874,8 @@ NAPI_METHOD(db_open) {
                                       createIfMissing, errorIfExists,
                                       compression, writeBufferSize, blockSize,
                                       maxOpenFiles, blockRestartInterval,
-                                      maxFileSize, cacheSize, readOnly);
+                                      maxFileSize, cacheSize,
+                                      infoLogLevel, readOnly);
   worker->Queue();
   delete [] location;
 
@@ -1192,6 +1220,11 @@ struct DestroyWorker final : public BaseWorker {
 
   void DoExecute () override {
     leveldb::Options options;
+
+    // TODO: support overriding infoLogLevel the same as db.open(options)
+    options.info_log_level = rocksdb::InfoLogLevel::HEADER_LEVEL;
+    options.info_log.reset(new NullLogger());
+
     SetStatus(leveldb::DestroyDB(location_, options));
   }
 
@@ -1228,6 +1261,11 @@ struct RepairWorker final : public BaseWorker {
 
   void DoExecute () override {
     leveldb::Options options;
+
+    // TODO: support overriding infoLogLevel the same as db.open(options)
+    options.info_log_level = rocksdb::InfoLogLevel::HEADER_LEVEL;
+    options.info_log.reset(new NullLogger());
+
     SetStatus(leveldb::RepairDB(location_, options));
   }
 

leveldown.js

@@ -3,7 +3,6 @@ const AbstractLevelDOWN = require('abstract-leveldown').AbstractLevelDOWN
 const binding = require('./binding')
 const ChainedBatch = require('./chained-batch')
 const Iterator = require('./iterator')
-const fs = require('fs')
 
 function LevelDOWN (location) {
   if (!(this instanceof LevelDOWN)) {
@@ -122,28 +121,7 @@ LevelDOWN.destroy = function (location, callback) {
     throw new Error('destroy() requires a callback function argument')
   }
 
-  binding.destroy_db(location, function (err) {
-    if (err) return callback(err)
-
-    // On Windows, RocksDB silently fails to remove the directory because its
-    // Logger, which is instantiated on destroy(), has an open file handle on a
-    // LOG file. Destroy() removes this file but Windows won't actually delete
-    // it until the handle is released. This happens when destroy() goes out of
-    // scope, which disposes the Logger. So back in JS-land, we can again
-    // attempt to remove the directory. This is merely a workaround because
-    // arguably RocksDB should not instantiate a Logger or open a file at all.
-    fs.rmdir(location, function (err) {
-      if (err) {
-        // Ignore this error in case there are non-RocksDB files left.
-        if (err.code === 'ENOTEMPTY') return callback()
-        if (err.code === 'ENOENT') return callback()
-
-        return callback(err)
-      }
-
-      callback()
-    })
-  })
+  binding.destroy_db(location, callback)
 }
 
 LevelDOWN.repair = function (location, callback) {

test/destroy-test.js

@@ -38,7 +38,8 @@ test('test destroy non-existent directory', function (t) {
     t.ifError(err, 'no error from rimraf()')
 
     leveldown.destroy(location, function (err) {
-      t.error(err, 'no error')
+      // This behavior differs from LevelDB, which is silent.
+      t.ok(/.*IO error.*/.test(err), 'got IO error')
 
       // Assert that destroy() didn't inadvertently create the directory.
       // Or if it did, that it was at least cleaned up afterwards.