replace manual ffi code with bindgen generated code

Cargo.toml

@@ -23,6 +23,9 @@ valgrind = []
 
 [dependencies]
 libc = "0.2.11"
+num = "0.2"
+num-derive = "0.3"
+num-traits = "0.2"
 
 [dependencies.librocksdb_sys]
 path = "librocksdb_sys"

librocksdb_sys/bindings/x86_64-unknown-linux-gnu-bindings.rs

@@ -416,14 +416,13 @@ pub struct crocksdb_writestallinfo_t {
 }
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]
-pub struct crocksdb_writestallcondition_t {
-    _unused: [u8; 0],
-}
-#[repr(C)]
-#[derive(Debug, Copy, Clone)]
 pub struct crocksdb_map_property_t {
     _unused: [u8; 0],
 }
+pub const crocksdb_writestallcondition_t_Normal: crocksdb_writestallcondition_t = 0;
+pub const crocksdb_writestallcondition_t_Delayed: crocksdb_writestallcondition_t = 1;
+pub const crocksdb_writestallcondition_t_Stopped: crocksdb_writestallcondition_t = 2;
+pub type crocksdb_writestallcondition_t = u32;
 pub const crocksdb_table_property_t_kDataSize: crocksdb_table_property_t = 1;
 pub const crocksdb_table_property_t_kIndexSize: crocksdb_table_property_t = 2;
 pub const crocksdb_table_property_t_kFilterSize: crocksdb_table_property_t = 3;
@@ -451,6 +450,23 @@ pub const crocksdb_backgrounderrorreason_t_kCompaction: crocksdb_backgrounderror
 pub const crocksdb_backgrounderrorreason_t_kWriteCallback: crocksdb_backgrounderrorreason_t = 3;
 pub const crocksdb_backgrounderrorreason_t_kMemTable: crocksdb_backgrounderrorreason_t = 4;
 pub type crocksdb_backgrounderrorreason_t = u32;
+pub const crocksdb_compaction_reason_t_Unknown: crocksdb_compaction_reason_t = 0;
+pub const crocksdb_compaction_reason_t_LevelL0FilesNum: crocksdb_compaction_reason_t = 1;
+pub const crocksdb_compaction_reason_t_LevelMaxLevelSize: crocksdb_compaction_reason_t = 2;
+pub const crocksdb_compaction_reason_t_UniversalSizeAmplification: crocksdb_compaction_reason_t = 3;
+pub const crocksdb_compaction_reason_t_UniversalSizeRatio: crocksdb_compaction_reason_t = 4;
+pub const crocksdb_compaction_reason_t_UniversalSortedRunNum: crocksdb_compaction_reason_t = 5;
+pub const crocksdb_compaction_reason_t_FIFOMaxSize: crocksdb_compaction_reason_t = 6;
+pub const crocksdb_compaction_reason_t_FIFOReduceNumFiles: crocksdb_compaction_reason_t = 7;
+pub const crocksdb_compaction_reason_t_FIFOTtl: crocksdb_compaction_reason_t = 8;
+pub const crocksdb_compaction_reason_t_ManualCompaction: crocksdb_compaction_reason_t = 9;
+pub const crocksdb_compaction_reason_t_FilesMarkedForCompaction: crocksdb_compaction_reason_t = 10;
+pub const crocksdb_compaction_reason_t_BottommostFiles: crocksdb_compaction_reason_t = 11;
+pub const crocksdb_compaction_reason_t_Ttl: crocksdb_compaction_reason_t = 12;
+pub const crocksdb_compaction_reason_t_Flush: crocksdb_compaction_reason_t = 13;
+pub const crocksdb_compaction_reason_t_ExternalSstIngestion: crocksdb_compaction_reason_t = 14;
+pub const crocksdb_compaction_reason_t_NumOfReasons: crocksdb_compaction_reason_t = 15;
+pub type crocksdb_compaction_reason_t = u32;
 extern "C" {
     pub fn crocksdb_open(
         options: *const crocksdb_options_t,
@@ -1558,6 +1574,11 @@ extern "C" {
         info: *const crocksdb_compactionjobinfo_t,
     ) -> u64;
 }
+extern "C" {
+    pub fn crocksdb_compactionjobinfo_compaction_reason(
+        info: *const crocksdb_compactionjobinfo_t,
+    ) -> *const crocksdb_compaction_reason_t;
+}
 extern "C" {
     pub fn crocksdb_externalfileingestioninfo_cf_name(
         arg1: *const crocksdb_externalfileingestioninfo_t,

librocksdb_sys/crocksdb/c.cc

@@ -233,9 +233,6 @@ struct crocksdb_pinnableslice_t   { PinnableSlice     rep; };
 struct crocksdb_flushjobinfo_t {
   FlushJobInfo rep;
 };
-struct crocksdb_writestallcondition_t {
-  WriteStallCondition rep;
-};
 struct crocksdb_writestallinfo_t {
   WriteStallInfo rep;
 };
@@ -2003,9 +2000,11 @@ uint64_t crocksdb_compactionjobinfo_total_output_bytes(
   return info->rep.stats.total_output_bytes;
 }
 
-CompactionReason crocksdb_compactionjobinfo_compaction_reason(
+const crocksdb_compaction_reason_t*
+crocksdb_compactionjobinfo_compaction_reason(
     const crocksdb_compactionjobinfo_t* info) {
-  return info->rep.compaction_reason;
+  return reinterpret_cast<const crocksdb_compaction_reason_t*>(
+      &info->rep.compaction_reason);
 }
 
 /* ExternalFileIngestionInfo */

librocksdb_sys/crocksdb/crocksdb/c.h

@@ -145,9 +145,14 @@ typedef struct crocksdb_compaction_options_t crocksdb_compaction_options_t;
 typedef struct crocksdb_perf_context_t crocksdb_perf_context_t;
 typedef struct crocksdb_iostats_context_t crocksdb_iostats_context_t;
 typedef struct crocksdb_writestallinfo_t crocksdb_writestallinfo_t;
-typedef struct crocksdb_writestallcondition_t crocksdb_writestallcondition_t;
 typedef struct crocksdb_map_property_t crocksdb_map_property_t;
 
+typedef enum crocksdb_writestallcondition_t {
+  Normal = 0,
+  Delayed = 1,
+  Stopped = 2,
+} crocksdb_writestallcondition_t;
+
 typedef enum crocksdb_table_property_t {
   kDataSize = 1,
   kIndexSize = 2,
@@ -181,8 +186,26 @@ typedef enum crocksdb_backgrounderrorreason_t {
   kMemTable = 4,
 } crocksdb_backgrounderrorreason_t;
 
-/* DB operations */
+typedef enum crocksdb_compaction_reason_t {
+  Unknown = 0,
+  LevelL0FilesNum = 1,
+  LevelMaxLevelSize = 2,
+  UniversalSizeAmplification = 3,
+  UniversalSizeRatio = 4,
+  UniversalSortedRunNum = 5,
+  FIFOMaxSize = 6,
+  FIFOReduceNumFiles = 7,
+  FIFOTtl = 8,
+  ManualCompaction = 9,
+  FilesMarkedForCompaction = 10,
+  BottommostFiles = 11,
+  Ttl = 12,
+  Flush = 13,
+  ExternalSstIngestion = 14,
+  NumOfReasons = 15,
+} crocksdb_compaction_reason_t;
 
+/* DB operations */
 extern C_ROCKSDB_LIBRARY_API crocksdb_t* crocksdb_open(
     const crocksdb_options_t* options, const char* name, char** errptr);
 
@@ -756,6 +779,9 @@ crocksdb_compactionjobinfo_total_input_bytes(
 extern C_ROCKSDB_LIBRARY_API uint64_t
 crocksdb_compactionjobinfo_total_output_bytes(
     const crocksdb_compactionjobinfo_t* info);
+extern C_ROCKSDB_LIBRARY_API const crocksdb_compaction_reason_t*
+crocksdb_compactionjobinfo_compaction_reason(
+    const crocksdb_compactionjobinfo_t* info);
 
 /* External file ingestion info */
 extern C_ROCKSDB_LIBRARY_API const char*