Bump rocksdb to version 5.15.10 and use data format version 3

Gopkg.lock

@@ -167,7 +167,7 @@
   branch = "master"
   name = "github.com/tecbot/gorocksdb"
   packages = ["."]
-  revision = "3e476152774442234f9a9f747386a48a1d82a515"
+  revision = "214b6b7bc0f06812ab5602fdc502a3e619916f38"
 
 [[projects]]
   branch = "master"

build/docker/bin/Dockerfile

@@ -10,7 +10,7 @@ RUN apt-get update && \
     apt-get clean
 
 ENV GOLANG_VERSION=go1.10.linux-amd64
-ENV ROCKSDB_VERSION=rocksdb-5.14.3
+ENV ROCKSDB_VERSION=v5.15.10
 ENV GOPATH=/go
 ENV PATH=$PATH:$GOPATH/bin
 ENV CGO_CFLAGS="-I/opt/rocksdb/include"

db/dboptions.go

@@ -1,6 +1,12 @@
 package db
 
+// #include "rocksdb/c.h"
+import "C"
+
 import (
+	"reflect"
+	"unsafe"
+
 	"github.com/tecbot/gorocksdb"
 )
 
@@ -39,12 +45,19 @@ func boolToChar(b bool) C.uchar {
 */
 
 func createAndSetDBOptions(bloomBits int, c *gorocksdb.Cache, maxOpenFiles int) *gorocksdb.Options {
-	blockOpts := gorocksdb.NewDefaultBlockBasedTableOptions()
+	// blockOpts := gorocksdb.NewDefaultBlockBasedTableOptions()
+	cNativeBlockOpts := C.rocksdb_block_based_options_create()
+	blockOpts := &gorocksdb.BlockBasedTableOptions{}
+	cBlockField := reflect.Indirect(reflect.ValueOf(blockOpts)).FieldByName("c")
+	cBlockPtr := (**C.rocksdb_block_based_table_options_t)(unsafe.Pointer(cBlockField.UnsafeAddr()))
+	*cBlockPtr = cNativeBlockOpts
 	blockOpts.SetBlockSize(32 << 10) // 32kB
 	blockOpts.SetBlockCache(c)
 	if bloomBits > 0 {
 		blockOpts.SetFilterPolicy(gorocksdb.NewBloomFilter(bloomBits))
 	}
+	C.rocksdb_block_based_options_set_format_version(cNativeBlockOpts, 3)
+
 	opts := gorocksdb.NewDefaultOptions()
 	opts.SetBlockBasedTableFactory(blockOpts)
 	opts.SetCreateIfMissing(true)