From d4184f7392a9bda044804b3f42ab73906bba31fd Mon Sep 17 00:00:00 2001
From: Uh Sado <sadoc@metadium.com>
Date: Tue, 21 Jan 2020 06:41:58 +0000
Subject: [PATCH] implemented replay function for rocksdb

---
 ethdb/rocksdb/rocksdb-c-util.go | 30 +++++++++++++++++++++
 ethdb/rocksdb/rocksdb.go        | 47 ++++++++++++++++++++++++++-------
 2 files changed, 68 insertions(+), 9 deletions(-)
 create mode 100644 ethdb/rocksdb/rocksdb-c-util.go

diff --git a/ethdb/rocksdb/rocksdb-c-util.go b/ethdb/rocksdb/rocksdb-c-util.go
new file mode 100644
index 000000000000..80bb683c57de
--- /dev/null
+++ b/ethdb/rocksdb/rocksdb-c-util.go
@@ -0,0 +1,30 @@
+// rocksdb-c-util.go
+// +build rocksdb
+
+package rocksdb
+
+/*
+
+#include <stdlib.h>
+#include "rocksdb/c.h"
+
+extern void replayPut(char *, char *, size_t, char *, size_t);
+extern void replayDel(char *, char *, size_t);
+
+static void replay_put(void *ptr, const char *k, size_t klen, const char *v, size_t vlen)
+{
+    replayPut((char *) ptr, (char *) k, klen, (char *) v, vlen);
+}
+
+static void replay_del(void *ptr, const char *k, size_t klen)
+{
+    replayDel((char *) ptr, (char *) k, klen);
+}
+
+void replay_iterate(int *wp, void *bp)
+{
+    rocksdb_writebatch_iterate(bp, wp, replay_put, replay_del);
+}
+
+*/
+import "C"
diff --git a/ethdb/rocksdb/rocksdb.go b/ethdb/rocksdb/rocksdb.go
index 4743ba2876b7..2c697808d953 100644
--- a/ethdb/rocksdb/rocksdb.go
+++ b/ethdb/rocksdb/rocksdb.go
@@ -1,10 +1,16 @@
-// rocksdb_database.go
+// rocksdb.go
 // +build rocksdb
 
 package rocksdb
 
-// #include <stdlib.h>
-// #include "rocksdb/c.h"
+/*
+#include <stdlib.h>
+#include "rocksdb/c.h"
+
+typedef int * intp;
+
+extern void replay_iterate(int *wp, void *bp);
+*/
 import "C"
 
 import (
@@ -20,7 +26,7 @@ import (
 // Metadium: db stats
 // (reads, read bytes, writes, written bytes, lookups, deletes)
 var (
-	_stats_enabled = false
+	_stats_enabled                                             = false
 	_r_count, _r_bytes, _w_count, _w_bytes, _l_count, _d_count uint64
 )
 
@@ -80,7 +86,7 @@ func (db *RDBDatabase) Path() string {
 func (db *RDBDatabase) Put(key []byte, value []byte) error {
 	if _stats_enabled {
 		atomic.AddUint64(&_w_count, 1)
-		atomic.AddUint64(&_w_bytes, uint64(len(key) + len(value)))
+		atomic.AddUint64(&_w_bytes, uint64(len(key)+len(value)))
 	}
 	var cerr *C.char
 	ck, cv := b2c(key), b2c(value)
@@ -131,7 +137,7 @@ func (db *RDBDatabase) Get(key []byte) ([]byte, error) {
 		return nil, nil
 	}
 	if _stats_enabled {
-		atomic.AddUint64(&_r_bytes, uint64(len(key)) + uint64(C.int(cvl)))
+		atomic.AddUint64(&_r_bytes, uint64(len(key))+uint64(C.int(cvl)))
 	}
 	defer C.free(unsafe.Pointer(cv))
 	return C.GoBytes(unsafe.Pointer(cv), C.int(cvl)), nil
@@ -206,7 +212,7 @@ type rdbBatch struct {
 func (b *rdbBatch) Put(key, value []byte) error {
 	if _stats_enabled {
 		atomic.AddUint64(&_w_count, 1)
-		atomic.AddUint64(&_w_bytes, uint64(len(key) + len(value)))
+		atomic.AddUint64(&_w_bytes, uint64(len(key)+len(value)))
 	}
 	ck, cv := b2c(key), b2c(value)
 	C.rocksdb_writebatch_put(b.b, ck, C.size_t(len(key)), cv, C.size_t(len(value)))
@@ -238,10 +244,33 @@ func (b *rdbBatch) Reset() {
 	b.size = 0
 }
 
+//export replayPut
+func replayPut(ptr *C.char, k *C.char, klen C.size_t, v *C.char, vlen C.size_t) {
+	w := (*ethdb.KeyValueWriter)(unsafe.Pointer(ptr))
+	if w != nil {
+		(*w).Put(C.GoBytes(unsafe.Pointer(k), C.int(klen)), C.GoBytes(unsafe.Pointer(v), C.int(vlen)))
+	}
+}
+
+//export replayDel
+func replayDel(ptr *C.char, k *C.char, klen C.size_t) {
+	w := (*ethdb.KeyValueWriter)(unsafe.Pointer(ptr))
+	if w != nil {
+		(*w).Delete(C.GoBytes(unsafe.Pointer(k), C.int(klen)))
+	}
+}
+
 // Replay replays the batch contents.
 func (b *rdbBatch) Replay(w ethdb.KeyValueWriter) error {
-	return errors.New("Not implemented")
-	//return b.b.Replay(&replayer{writer: w})
+	repsize := C.size_t(0)
+	rep := C.rocksdb_writebatch_data(b.b, &repsize)
+	b2 := C.rocksdb_writebatch_create_from(rep, repsize)
+	bp := unsafe.Pointer(b2)
+	wp := (C.intp)(unsafe.Pointer(&w))
+
+	C.replay_iterate(wp, bp)
+	C.rocksdb_writebatch_destroy(b2)
+	return nil
 }
 
 // replayer is a small wrapper to implement the correct replay methods.