From d035ac7c8c624fc884dbc300a2ec7dcaf8dc1905 Mon Sep 17 00:00:00 2001
From: Sonic <sonic@dexon.org>
Date: Tue, 20 Nov 2018 12:05:00 +0800
Subject: dex: add BlockDB, which implements consensus core's
 blockdb.BlockDatabase (#36)

---
 core/rawdb/accessors_core_block.go | 51 ++++++++++++++++++++++++++++++++++++++
 core/rawdb/schema.go               |  7 ++++++
 2 files changed, 58 insertions(+)
 create mode 100644 core/rawdb/accessors_core_block.go

(limited to 'core')

diff --git a/core/rawdb/accessors_core_block.go b/core/rawdb/accessors_core_block.go
new file mode 100644
index 000000000..5fa5c8f86
--- /dev/null
+++ b/core/rawdb/accessors_core_block.go
@@ -0,0 +1,51 @@
+package rawdb
+
+import (
+	"bytes"
+
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+
+	"github.com/dexon-foundation/dexon/common"
+	"github.com/dexon-foundation/dexon/log"
+	"github.com/dexon-foundation/dexon/rlp"
+)
+
+func ReadCoreBlockRLP(db DatabaseReader, hash common.Hash) rlp.RawValue {
+	data, _ := db.Get(coreBlockKey(hash))
+	return data
+}
+
+func WriteCoreBlockRLP(db DatabaseWriter, hash common.Hash, rlp rlp.RawValue) {
+	if err := db.Put(coreBlockKey(hash), rlp); err != nil {
+		log.Crit("Failed to store core block", "err", err)
+	}
+}
+
+func HasCoreBlock(db DatabaseReader, hash common.Hash) bool {
+	if has, err := db.Has(coreBlockKey(hash)); !has || err != nil {
+		return false
+	}
+	return true
+}
+
+func ReadCoreBlock(db DatabaseReader, hash common.Hash) *coreTypes.Block {
+	data := ReadCoreBlockRLP(db, hash)
+	if len(data) == 0 {
+		return nil
+	}
+
+	block := new(coreTypes.Block)
+	if err := rlp.Decode(bytes.NewReader(data), block); err != nil {
+		log.Error("Invalid core block RLP", "hash", hash, "err", err)
+		return nil
+	}
+	return block
+}
+
+func WriteCoreBlock(db DatabaseWriter, hash common.Hash, block *coreTypes.Block) {
+	data, err := rlp.EncodeToBytes(block)
+	if err != nil {
+		log.Crit("Failed to RLP encode core block", "err", err)
+	}
+	WriteCoreBlockRLP(db, hash, data)
+}
diff --git a/core/rawdb/schema.go b/core/rawdb/schema.go
index ee1949112..9a820a578 100644
--- a/core/rawdb/schema.go
+++ b/core/rawdb/schema.go
@@ -53,6 +53,8 @@ var (
 	txLookupPrefix  = []byte("l") // txLookupPrefix + hash -> transaction/receipt lookup metadata
 	bloomBitsPrefix = []byte("B") // bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash -> bloom bits
 
+	coreBlockPrefix = []byte("D")
+
 	preimagePrefix = []byte("secure-key-")      // preimagePrefix + hash -> preimage
 	configPrefix   = []byte("ethereum-config-") // config prefix for the db
 
@@ -113,6 +115,11 @@ func txLookupKey(hash common.Hash) []byte {
 	return append(txLookupPrefix, hash.Bytes()...)
 }
 
+// coreBlockKey = coreBlockPrefix + hash
+func coreBlockKey(hash common.Hash) []byte {
+	return append(coreBlockPrefix, hash.Bytes()...)
+}
+
 // bloomBitsKey = bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash
 func bloomBitsKey(bit uint, section uint64, hash common.Hash) []byte {
 	key := append(append(bloomBitsPrefix, make([]byte, 10)...), hash.Bytes()...)
-- 
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