Derive `serde::{Serialize, Deserialize}` for configuration enums (#556)

Cargo.toml

@@ -27,10 +27,12 @@ zlib = ["librocksdb-sys/zlib"]
 bzip2 = ["librocksdb-sys/bzip2"]
 rtti = ["librocksdb-sys/rtti"]
 multi-threaded-cf = []
+serde1 = ["serde"]
 
 [dependencies]
 libc = "0.2"
 librocksdb-sys = { path = "librocksdb-sys", version = "6.20.3" }
+serde = { version = "1", features = [ "derive" ], optional = true }
 
 [dev-dependencies]
 trybuild = "1.0"

src/db_options.rs

@@ -3085,6 +3085,7 @@ impl Default for WriteOptions {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 #[repr(i32)]
 pub enum ReadTier {
     /// Reads data in memtable, block cache, OS cache or storage.
@@ -3409,6 +3410,7 @@ pub struct PlainTableFactoryOptions {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 pub enum DBCompressionType {
     None = ffi::rocksdb_no_compression as isize,
     Snappy = ffi::rocksdb_snappy_compression as isize,
@@ -3420,6 +3422,7 @@ pub enum DBCompressionType {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 pub enum DBCompactionStyle {
     Level = ffi::rocksdb_level_compaction as isize,
     Universal = ffi::rocksdb_universal_compaction as isize,
@@ -3427,6 +3430,7 @@ pub enum DBCompactionStyle {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 pub enum DBRecoveryMode {
     TolerateCorruptedTailRecords = ffi::rocksdb_tolerate_corrupted_tail_records_recovery as isize,
     AbsoluteConsistency = ffi::rocksdb_absolute_consistency_recovery as isize,
@@ -3436,6 +3440,7 @@ pub enum DBRecoveryMode {
 
 /// File access pattern once a compaction has started
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 #[repr(i32)]
 pub enum AccessHint {
     None = 0,
@@ -3481,6 +3486,7 @@ impl FifoCompactOptions {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 pub enum UniversalCompactionStopStyle {
     Similar = ffi::rocksdb_similar_size_compaction_stop_style as isize,
     Total = ffi::rocksdb_total_size_compaction_stop_style as isize,
@@ -3594,6 +3600,7 @@ impl UniversalCompactOptions {
 }
 
 #[derive(Debug, Copy, Clone, PartialEq)]
+#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]
 #[repr(u8)]
 pub enum BottommostLevelCompaction {
     /// Skip bottommost level compaction