dex: add api_backend.go and it's dependencies

1 files changed, 221 insertions, 0 deletions

diff --git a/dex/api_backend.go b/dex/api_backend.go
new file mode 100644
index 000000000..151a5d7da
--- /dev/null
+++ b/dex/api_backend.go
@@ -0,0 +1,221 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package dex
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/dexon-foundation/dexon/accounts"
+	"github.com/dexon-foundation/dexon/common"
+	"github.com/dexon-foundation/dexon/common/math"
+	"github.com/dexon-foundation/dexon/core"
+	"github.com/dexon-foundation/dexon/core/bloombits"
+	"github.com/dexon-foundation/dexon/core/rawdb"
+	"github.com/dexon-foundation/dexon/core/state"
+	"github.com/dexon-foundation/dexon/core/types"
+	"github.com/dexon-foundation/dexon/core/vm"
+	"github.com/dexon-foundation/dexon/eth/gasprice"
+
+	"github.com/dexon-foundation/dexon/ethdb"
+	"github.com/dexon-foundation/dexon/event"
+	"github.com/dexon-foundation/dexon/params"
+	"github.com/dexon-foundation/dexon/rpc"
+)
+
+// DexAPIBackend implements ethapi.Backend for full nodes
+type DexAPIBackend struct {
+	dex *Dexon
+	gpo *gasprice.Oracle
+}
+
+// ChainConfig returns the active chain configuration.
+func (b *DexAPIBackend) ChainConfig() *params.ChainConfig {
+	return b.dex.chainConfig
+}
+
+func (b *DexAPIBackend) CurrentBlock() *types.Block {
+	return b.dex.blockchain.CurrentBlock()
+}
+
+func (b *DexAPIBackend) SetHead(number uint64) {
+	b.dex.protocolManager.downloader.Cancel()
+	b.dex.blockchain.SetHead(number)
+}
+
+func (b *DexAPIBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
+	// Otherwise resolve and return the block
+	if blockNr == rpc.LatestBlockNumber {
+		return b.dex.blockchain.CurrentBlock().Header(), nil
+	}
+	return b.dex.blockchain.GetHeaderByNumber(uint64(blockNr)), nil
+}
+
+func (b *DexAPIBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
+	return b.dex.blockchain.GetHeaderByHash(hash), nil
+}
+
+func (b *DexAPIBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
+	// Otherwise resolve and return the block
+	if blockNr == rpc.LatestBlockNumber {
+		return b.dex.blockchain.CurrentBlock(), nil
+	}
+	return b.dex.blockchain.GetBlockByNumber(uint64(blockNr)), nil
+}
+
+func (b *DexAPIBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
+	header, err := b.HeaderByNumber(ctx, blockNr)
+	if header == nil || err != nil {
+		return nil, nil, err
+	}
+	stateDb, err := b.dex.BlockChain().StateAt(header.Root)
+	return stateDb, header, err
+}
+
+func (b *DexAPIBackend) GetBlock(ctx context.Context, hash common.Hash) (*types.Block, error) {
+	return b.dex.blockchain.GetBlockByHash(hash), nil
+}
+
+func (b *DexAPIBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
+	if number := rawdb.ReadHeaderNumber(b.dex.chainDb, hash); number != nil {
+		return rawdb.ReadReceipts(b.dex.chainDb, hash, *number), nil
+	}
+	return nil, nil
+}
+
+func (b *DexAPIBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*types.Log, error) {
+	number := rawdb.ReadHeaderNumber(b.dex.chainDb, hash)
+	if number == nil {
+		return nil, nil
+	}
+	receipts := rawdb.ReadReceipts(b.dex.chainDb, hash, *number)
+	if receipts == nil {
+		return nil, nil
+	}
+	logs := make([][]*types.Log, len(receipts))
+	for i, receipt := range receipts {
+		logs[i] = receipt.Logs
+	}
+	return logs, nil
+}
+
+func (b *DexAPIBackend) GetTd(blockHash common.Hash) *big.Int {
+	return b.dex.blockchain.GetTdByHash(blockHash)
+}
+
+func (b *DexAPIBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header) (*vm.EVM, func() error, error) {
+	state.SetBalance(msg.From(), math.MaxBig256)
+	vmError := func() error { return nil }
+
+	context := core.NewEVMContext(msg, header, b.dex.BlockChain(), nil)
+	return vm.NewEVM(context, state, b.dex.chainConfig, *b.dex.blockchain.GetVMConfig()), vmError, nil
+}
+
+func (b *DexAPIBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
+	return b.dex.BlockChain().SubscribeRemovedLogsEvent(ch)
+}
+
+func (b *DexAPIBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
+	return b.dex.BlockChain().SubscribeChainEvent(ch)
+}
+
+func (b *DexAPIBackend) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
+	return b.dex.BlockChain().SubscribeChainHeadEvent(ch)
+}
+
+func (b *DexAPIBackend) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription {
+	return b.dex.BlockChain().SubscribeChainSideEvent(ch)
+}
+
+func (b *DexAPIBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
+	return b.dex.BlockChain().SubscribeLogsEvent(ch)
+}
+
+func (b *DexAPIBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
+	return b.dex.txPool.AddLocal(signedTx)
+}
+
+func (b *DexAPIBackend) GetPoolTransactions() (types.Transactions, error) {
+	pending, err := b.dex.txPool.Pending()
+	if err != nil {
+		return nil, err
+	}
+	var txs types.Transactions
+	for _, batch := range pending {
+		txs = append(txs, batch...)
+	}
+	return txs, nil
+}
+
+func (b *DexAPIBackend) GetPoolTransaction(hash common.Hash) *types.Transaction {
+	return b.dex.txPool.Get(hash)
+}
+
+func (b *DexAPIBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
+	return b.dex.txPool.State().GetNonce(addr), nil
+}
+
+func (b *DexAPIBackend) Stats() (pending int, queued int) {
+	return b.dex.txPool.Stats()
+}
+
+func (b *DexAPIBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
+	return b.dex.TxPool().Content()
+}
+
+func (b *DexAPIBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
+	return b.dex.TxPool().SubscribeNewTxsEvent(ch)
+}
+
+//func (b *DexAPIBackend) Downloader() *downloader.Downloader {
+//	return b.dex.Downloader()
+//}
+
+func (b *DexAPIBackend) ProtocolVersion() int {
+	return b.dex.DexVersion()
+}
+
+func (b *DexAPIBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
+	return b.gpo.SuggestPrice(ctx)
+}
+
+func (b *DexAPIBackend) ChainDb() ethdb.Database {
+	return b.dex.ChainDb()
+}
+
+func (b *DexAPIBackend) EventMux() *event.TypeMux {
+	return b.dex.EventMux()
+}
+
+func (b *DexAPIBackend) AccountManager() *accounts.Manager {
+	return b.dex.AccountManager()
+}
+
+func (b *DexAPIBackend) RPCGasCap() *big.Int {
+	return b.dex.config.RPCGasCap
+}
+
+func (b *DexAPIBackend) BloomStatus() (uint64, uint64) {
+	sections, _, _ := b.dex.bloomIndexer.Sections()
+	return params.BloomBitsBlocks, sections
+}
+
+func (b *DexAPIBackend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession) {
+	for i := 0; i < bloomFilterThreads; i++ {
+		go session.Multiplex(bloomRetrievalBatch, bloomRetrievalWait, b.dex.bloomRequests)
+	}
+}