options: add set_info_log_level to control log verbosity (#553)

src/db_options.rs

@@ -789,6 +789,18 @@ impl Default for CuckooTableOptions {
     }
 }
 
+// Verbosity of the LOG.
+#[derive(Debug, Copy, Clone, PartialEq)]
+#[repr(i32)]
+pub enum LogLevel {
+    Debug = 0,
+    Info,
+    Warn,
+    Error,
+    Fatal,
+    Header,
+}
+
 impl Options {
     /// By default, RocksDB uses only one background thread for flush and
     /// compaction. Calling this function will set it up such that total of
@@ -1380,6 +1392,25 @@ impl Options {
         }
     }
 
+    /// Specifies the log level.
+    /// Consider the `LogLevel` enum for a list of possible levels.
+    ///
+    /// Default: Info
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rocksdb::{Options, LogLevel};
+    ///
+    /// let mut opts = Options::default();
+    /// opts.set_log_level(LogLevel::Warn);
+    /// ```
+    pub fn set_log_level(&mut self, level: LogLevel) {
+        unsafe {
+            ffi::rocksdb_options_set_info_log_level(self.inner, level as c_int);
+        }
+    }
+
     /// Allows OS to incrementally sync files to disk while they are being
     /// written, asynchronously, in the background. This operation can be used
     /// to smooth out write I/Os over time. Users shouldn't rely on it for

src/lib.rs

@@ -110,8 +110,8 @@ pub use crate::{
         BlockBasedIndexType, BlockBasedOptions, BottommostLevelCompaction, Cache, CompactOptions,
         CuckooTableOptions, DBCompactionStyle, DBCompressionType, DBPath, DBRecoveryMode,
         DataBlockIndexType, Env, FifoCompactOptions, FlushOptions, IngestExternalFileOptions,
-        MemtableFactory, Options, PlainTableFactoryOptions, ReadOptions, UniversalCompactOptions,
+        LogLevel, MemtableFactory, Options, PlainTableFactoryOptions, ReadOptions,
-        UniversalCompactionStopStyle, WriteOptions,
+        UniversalCompactOptions, UniversalCompactionStopStyle, WriteOptions,
     },
     db_pinnable_slice::DBPinnableSlice,
     merge_operator::MergeOperands,