Flags and interfaces for historical RPC requests (ethereum#12)

Author: maurelian

eth/api_backend.go

@@ -382,3 +382,11 @@ func (b *EthAPIBackend) StateAtBlock(ctx context.Context, block *types.Block, re
 func (b *EthAPIBackend) StateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, tracers.StateReleaseFunc, error) {
 	return b.eth.stateAtTransaction(block, txIndex, reexec)
 }
+
+func (b *EthAPIBackend) SequencerRPCService() *rpc.Client {
+	return b.eth.seqRPCService
+}
+
+func (b *EthAPIBackend) Genesis() *types.Block {
+	return b.eth.blockchain.Genesis()
+}

internal/ethapi/backend.go

@@ -86,6 +86,8 @@ type Backend interface {
 
 	ChainConfig() *params.ChainConfig
 	Engine() consensus.Engine
+	SequencerRPCService() *rpc.Client
+	Genesis() *types.Block
 
 	// eth/filters needs to be initialized from this backend type, so methods needed by
 	// it must also be included here.

internal/ethapi/transaction_args_test.go

@@ -339,4 +339,6 @@ func (b *backendMock) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent)
 	return nil
 }
 
-func (b *backendMock) Engine() consensus.Engine { return nil }
+func (b *backendMock) Engine() consensus.Engine         { return nil }
+func (b *backendMock) SequencerRPCService() *rpc.Client { return nil }
+func (b *backendMock) Genesis() *types.Block            { return nil }

les/api_backend.go

@@ -330,3 +330,11 @@ func (b *LesApiBackend) StateAtBlock(ctx context.Context, block *types.Block, re
 func (b *LesApiBackend) StateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, tracers.StateReleaseFunc, error) {
 	return b.eth.stateAtTransaction(ctx, block, txIndex, reexec)
 }
+
+func (b *LesApiBackend) SequencerRPCService() *rpc.Client {
+	return b.eth.seqRPCService
+}
+
+func (b *LesApiBackend) Genesis() *types.Block {
+	return b.eth.blockchain.Genesis()
+}

les/client.go

@@ -18,6 +18,7 @@
 package les
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -66,6 +67,9 @@ type LightEthereum struct {
 	pruner             *pruner
 	merger             *consensus.Merger
 
+	seqRPCService        *rpc.Client
+	historicalRPCService *rpc.Client
+
 	bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
 	bloomIndexer  *core.ChainIndexer             // Bloom indexer operating during block imports
 
@@ -195,6 +199,26 @@ func New(stack *node.Node, config *ethconfig.Config) (*LightEthereum, error) {
 		leth.blockchain.DisableCheckFreq()
 	}
 
+	if config.RollupSequencerHTTP != "" {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		client, err := rpc.DialContext(ctx, config.RollupSequencerHTTP)
+		cancel()
+		if err != nil {
+			return nil, err
+		}
+		leth.seqRPCService = client
+	}
+
+	if config.RollupHistoricalRPC != "" {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		client, err := rpc.DialContext(ctx, config.RollupHistoricalRPC)
+		cancel()
+		if err != nil {
+			return nil, err
+		}
+		leth.historicalRPCService = client
+	}
+
 	leth.netRPCService = ethapi.NewNetAPI(leth.p2pServer, leth.config.NetworkId)
 
 	// Register the backend on the node