Start adding WriteOptions.

src/ffi.rs

@@ -190,6 +190,8 @@ extern {
                         -> DBInstance;
     pub fn rocksdb_writeoptions_create() -> DBWriteOptions;
     pub fn rocksdb_writeoptions_destroy(writeopts: DBWriteOptions);
+    pub fn rocksdb_writeoptions_set_sync(writeopts: DBWriteOptions, v: bool);
+    pub fn rocksdb_writeoptions_disable_WAL(writeopts: DBWriteOptions, v: c_int);
     pub fn rocksdb_put(db: DBInstance,
                        writeopts: DBWriteOptions,
                        k: *const u8,

src/rocksdb_options.rs

@@ -31,6 +31,10 @@ pub struct Options {
     pub inner: rocksdb_ffi::DBOptions,
 }
 
+pub struct WriteOptions {
+    pub inner: rocksdb_ffi::DBWriteOptions,
+}
+
 impl Drop for Options {
     fn drop(&mut self) {
         unsafe {
@@ -47,6 +51,14 @@ impl Drop for BlockBasedOptions {
     }
 }
 
+impl Drop for WriteOptions {
+    fn drop(&mut self) {
+        unsafe {
+            rocksdb_ffi::rocksdb_writeoptions_destroy(self.inner);
+        }
+    }
+}
+
 impl BlockBasedOptions {
     pub fn new() -> BlockBasedOptions {
         let block_opts = unsafe {
@@ -311,3 +323,19 @@ impl Options {
         }
     }
 }
+
+impl WriteOptions {
+    pub fn new() -> WriteOptions {
+        let write_opts = unsafe { rocksdb_ffi::rocksdb_writeoptions_create() };
+        let rocksdb_ffi::DBWriteOptions(opt_ptr) = write_opts;
+        if opt_ptr.is_null() {
+            panic!("Could not create rocksdb write options".to_string());
+        }
+        WriteOptions { inner: write_opts }
+    }
+    pub fn set_sync(&mut self, sync: bool) {
+        unsafe {
+            rocksdb_ffi::rocksdb_writeoptions_set_sync(self.inner, sync);
+        }
+    }
+}