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)

---
 dex/backend.go    | 13 ++-----------
 dex/blockdb/db.go | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 11 deletions(-)
 create mode 100644 dex/blockdb/db.go

(limited to 'dex')

diff --git a/dex/backend.go b/dex/backend.go
index 07646fd76..36b28345c 100644
--- a/dex/backend.go
+++ b/dex/backend.go
@@ -19,11 +19,9 @@ package dex
 
 import (
 	"fmt"
-	"path/filepath"
 	"time"
 
 	dexCore "github.com/dexon-foundation/dexon-consensus/core"
-	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
 	coreEcdsa "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
 	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 
@@ -34,6 +32,7 @@ import (
 	"github.com/dexon-foundation/dexon/core/bloombits"
 	"github.com/dexon-foundation/dexon/core/rawdb"
 	"github.com/dexon-foundation/dexon/core/vm"
+	"github.com/dexon-foundation/dexon/dex/blockdb"
 	"github.com/dexon-foundation/dexon/eth/downloader"
 	"github.com/dexon-foundation/dexon/eth/filters"
 	"github.com/dexon-foundation/dexon/eth/gasprice"
@@ -76,7 +75,6 @@ type Dexon struct {
 	app        *DexconApp
 	governance *DexconGovernance
 	network    *DexconNetwork
-	blockdb    blockdb.BlockDatabase
 	consensus  *dexCore.Consensus
 
 	networkID     uint64
@@ -85,12 +83,6 @@ type Dexon struct {
 
 func New(ctx *node.ServiceContext, config *Config) (*Dexon, error) {
 	// Consensus.
-	blockDBPath := filepath.Join(ctx.Config.DataDir, "dexcon", "blockdb")
-	db, err := blockdb.NewLevelDBBackedBlockDB(blockDBPath)
-	if err != nil {
-		panic(err)
-	}
-
 	chainDb, err := CreateDB(ctx, config, "chaindata")
 	if err != nil {
 		return nil, err
@@ -122,7 +114,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Dexon, error) {
 		networkID:      config.NetworkId,
 		bloomRequests:  make(chan chan *bloombits.Retrieval),
 		bloomIndexer:   NewBloomIndexer(chainDb, params.BloomBitsBlocks, params.BloomConfirms),
-		blockdb:        db,
 		engine:         engine,
 	}
 
@@ -184,7 +175,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Dexon, error) {
 		0, now.Location())
 
 	dex.consensus = dexCore.NewConsensus(dMoment,
-		dex.app, dex.governance, db, dex.network, privKey, log.Root())
+		dex.app, dex.governance, blockdb.NewDatabase(chainDb), dex.network, privKey, log.Root())
 	return dex, nil
 }
 
diff --git a/dex/blockdb/db.go b/dex/blockdb/db.go
new file mode 100644
index 000000000..8282923fb
--- /dev/null
+++ b/dex/blockdb/db.go
@@ -0,0 +1,54 @@
+package blockdb
+
+import (
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreBlockdb "github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+
+	"github.com/dexon-foundation/dexon/common"
+	"github.com/dexon-foundation/dexon/core/rawdb"
+	"github.com/dexon-foundation/dexon/ethdb"
+)
+
+// BlockDB implement dexon-consensus BlockDatabase interface.
+type BlockDB struct {
+	db ethdb.Database
+}
+
+func NewDatabase(db ethdb.Database) *BlockDB {
+	return &BlockDB{db}
+}
+
+func (d *BlockDB) Has(hash coreCommon.Hash) bool {
+	return rawdb.HasCoreBlock(d.db, common.Hash(hash))
+}
+
+func (d *BlockDB) Get(hash coreCommon.Hash) (coreTypes.Block, error) {
+	block := rawdb.ReadCoreBlock(d.db, common.Hash(hash))
+	if block == nil {
+		return coreTypes.Block{}, coreBlockdb.ErrBlockDoesNotExist
+	}
+	return *block, nil
+}
+
+func (d *BlockDB) GetAll() (coreBlockdb.BlockIterator, error) {
+	return nil, coreBlockdb.ErrNotImplemented
+}
+
+func (d *BlockDB) Update(block coreTypes.Block) error {
+	if !d.Has(block.Hash) {
+		return coreBlockdb.ErrBlockDoesNotExist
+	}
+	rawdb.WriteCoreBlock(d.db, common.Hash(block.Hash), &block)
+	return nil
+}
+
+func (d *BlockDB) Put(block coreTypes.Block) error {
+	if d.Has(block.Hash) {
+		return coreBlockdb.ErrBlockExists
+	}
+	rawdb.WriteCoreBlock(d.db, common.Hash(block.Hash), &block)
+	return nil
+}
+
+func (d *BlockDB) Close() error { return nil }
-- 
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