424 lines
14 KiB
Go
424 lines
14 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package seed_node
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import (
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/statediff"
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log "github.com/sirupsen/logrus"
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"github.com/vulcanize/vulcanizedb/libraries/shared/streamer"
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"github.com/vulcanize/vulcanizedb/pkg/config"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"github.com/vulcanize/vulcanizedb/pkg/ipfs"
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)
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const payloadChanBufferSize = 20000 // the max eth sub buffer size
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// NodeInterface is the top level interface for streaming, converting to IPLDs, publishing,
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// and indexing all Ethereum data; screening this data; and serving it up to subscribed clients
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// This service is compatible with the Ethereum service interface (node.Service)
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type NodeInterface interface {
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// APIs(), Protocols(), Start() and Stop()
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node.Service
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// Main event loop for syncAndPublish processes
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SyncAndPublish(wg *sync.WaitGroup, forwardPayloadChan chan<- ipfs.IPLDPayload, forwardQuitchan chan<- bool) error
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// Main event loop for handling client pub-sub
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ScreenAndServe(screenAndServePayload <-chan ipfs.IPLDPayload, screenAndServeQuit <-chan bool)
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// Method to subscribe to receive state diff processing output
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Subscribe(id rpc.ID, sub chan<- streamer.SeedNodePayload, quitChan chan<- bool, streamFilters config.Subscription)
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// Method to unsubscribe from state diff processing
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Unsubscribe(id rpc.ID)
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// Method to access the Geth node info for this service
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Node() core.Node
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}
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// Service is the underlying struct for the SyncAndPublish interface
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type Service struct {
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// Used to sync access to the Subscriptions
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sync.Mutex
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// Interface for streaming statediff payloads over a geth rpc subscription
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Streamer streamer.IStateDiffStreamer
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// Interface for converting statediff payloads into ETH-IPLD object payloads
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Converter ipfs.PayloadConverter
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// Interface for publishing the ETH-IPLD payloads to IPFS
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Publisher ipfs.IPLDPublisher
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// Interface for indexing the CIDs of the published ETH-IPLDs in Postgres
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Repository CIDRepository
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// Interface for filtering and serving data according to subscribed clients according to their specification
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Filterer ResponseFilterer
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// Interface for fetching ETH-IPLD objects from IPFS
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Fetcher ipfs.IPLDFetcher
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// Interface for searching and retrieving CIDs from Postgres index
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Retriever CIDRetriever
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// Interface for resolving ipfs blocks to their data types
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Resolver ipfs.IPLDResolver
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// Chan the processor uses to subscribe to state diff payloads from the Streamer
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PayloadChan chan statediff.Payload
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// Used to signal shutdown of the service
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QuitChan chan bool
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// A mapping of rpc.IDs to their subscription channels, mapped to their subscription type (hash of the StreamFilters)
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Subscriptions map[common.Hash]map[rpc.ID]Subscription
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// A mapping of subscription hash type to the corresponding StreamFilters
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SubscriptionTypes map[common.Hash]config.Subscription
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// Number of workers
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WorkerPoolSize int
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// Info for the Geth node that this seed node is working with
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gethNode core.Node
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}
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// NewSeedNode creates a new seed_node.Interface using an underlying seed_node.Service struct
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func NewSeedNode(ipfsPath string, db *postgres.DB, rpcClient core.RpcClient, qc chan bool, workers int, node core.Node) (NodeInterface, error) {
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publisher, err := ipfs.NewIPLDPublisher(ipfsPath)
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if err != nil {
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return nil, err
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}
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fetcher, err := ipfs.NewIPLDFetcher(ipfsPath)
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if err != nil {
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return nil, err
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}
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return &Service{
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Streamer: streamer.NewStateDiffStreamer(rpcClient),
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Repository: NewCIDRepository(db),
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Converter: ipfs.NewPayloadConverter(params.MainnetChainConfig),
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Publisher: publisher,
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Filterer: NewResponseFilterer(),
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Fetcher: fetcher,
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Retriever: NewCIDRetriever(db),
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Resolver: ipfs.NewIPLDResolver(),
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PayloadChan: make(chan statediff.Payload, payloadChanBufferSize),
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QuitChan: qc,
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Subscriptions: make(map[common.Hash]map[rpc.ID]Subscription),
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SubscriptionTypes: make(map[common.Hash]config.Subscription),
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WorkerPoolSize: workers,
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gethNode: node,
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}, nil
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}
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// Protocols exports the services p2p protocols, this service has none
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func (sap *Service) Protocols() []p2p.Protocol {
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return []p2p.Protocol{}
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}
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// APIs returns the RPC descriptors the StateDiffingService offers
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func (sap *Service) APIs() []rpc.API {
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return []rpc.API{
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{
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Namespace: APIName,
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Version: APIVersion,
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Service: NewPublicSeedNodeAPI(sap),
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Public: true,
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},
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}
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}
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// SyncAndPublish is the backend processing loop which streams data from geth, converts it to iplds, publishes them to ipfs, and indexes their cids
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// This continues on no matter if or how many subscribers there are, it then forwards the data to the ScreenAndServe() loop
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// which filters and sends relevant data to client subscriptions, if there are any
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func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload chan<- ipfs.IPLDPayload, screenAndServeQuit chan<- bool) error {
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sub, err := sap.Streamer.Stream(sap.PayloadChan)
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if err != nil {
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return err
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}
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wg.Add(1)
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// Channels for forwarding data to the publishAndIndex workers
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publishAndIndexPayload := make(chan ipfs.IPLDPayload, payloadChanBufferSize)
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publishAndIndexQuit := make(chan bool, sap.WorkerPoolSize)
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// publishAndIndex worker pool to handle publishing and indexing concurrently, while
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// limiting the number of Postgres connections we can possibly open so as to prevent error
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for i := 0; i < sap.WorkerPoolSize; i++ {
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sap.publishAndIndex(i, publishAndIndexPayload, publishAndIndexQuit)
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}
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go func() {
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for {
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select {
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case payload := <-sap.PayloadChan:
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ipldPayload, err := sap.Converter.Convert(payload)
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if err != nil {
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log.Error(err)
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continue
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}
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// If we have a ScreenAndServe process running, forward the payload to it
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select {
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case screenAndServePayload <- *ipldPayload:
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default:
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}
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// Forward the payload to the publishAndIndex workers
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select {
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case publishAndIndexPayload <- *ipldPayload:
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default:
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}
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case err = <-sub.Err():
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log.Error(err)
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case <-sap.QuitChan:
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// If we have a ScreenAndServe process running, forward the quit signal to it
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select {
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case screenAndServeQuit <- true:
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default:
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}
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// Also forward a quit signal for each of the workers
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for i := 0; i < sap.WorkerPoolSize; i++ {
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select {
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case publishAndIndexQuit <- true:
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default:
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}
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}
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log.Info("quiting SyncAndPublish process")
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wg.Done()
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return
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}
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}
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}()
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return nil
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}
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func (sap *Service) publishAndIndex(id int, publishAndIndexPayload <-chan ipfs.IPLDPayload, publishAndIndexQuit <-chan bool) {
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go func() {
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for {
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select {
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case payload := <-publishAndIndexPayload:
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cidPayload, err := sap.Publisher.Publish(&payload)
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if err != nil {
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log.Errorf("worker %d error: %v", id, err)
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continue
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}
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err = sap.Repository.Index(cidPayload)
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if err != nil {
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log.Errorf("worker %d error: %v", id, err)
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}
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case <-publishAndIndexQuit:
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log.Infof("quiting publishAndIndex worker %d", id)
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return
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}
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}
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}()
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}
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// ScreenAndServe is the loop used to screen data streamed from the state diffing eth node
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// and send the appropriate portions of it to a requesting client subscription, according to their subscription configuration
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func (sap *Service) ScreenAndServe(screenAndServePayload <-chan ipfs.IPLDPayload, screenAndServeQuit <-chan bool) {
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go func() {
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for {
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select {
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case payload := <-screenAndServePayload:
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err := sap.sendResponse(payload)
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if err != nil {
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log.Error(err)
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}
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case <-screenAndServeQuit:
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log.Info("quiting ScreenAndServe process")
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return
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}
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}
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}()
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}
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func (sap *Service) sendResponse(payload ipfs.IPLDPayload) error {
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sap.Lock()
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for ty, subs := range sap.Subscriptions {
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// Retrieve the subscription parameters for this subscription type
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subConfig, ok := sap.SubscriptionTypes[ty]
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if !ok {
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log.Errorf("subscription configuration for subscription type %s not available", ty.Hex())
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continue
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}
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response, err := sap.Filterer.FilterResponse(subConfig, payload)
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if err != nil {
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log.Error(err)
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continue
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}
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for id, sub := range subs {
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select {
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case sub.PayloadChan <- response:
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log.Infof("sending seed node payload to subscription %s", id)
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default:
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log.Infof("unable to send payload to subscription %s; channel has no receiver", id)
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}
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}
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}
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sap.Unlock()
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return nil
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}
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// Subscribe is used by the API to subscribe to the service loop
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func (sap *Service) Subscribe(id rpc.ID, sub chan<- streamer.SeedNodePayload, quitChan chan<- bool, streamFilters config.Subscription) {
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log.Info("Subscribing to the seed node service")
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// Subscription type is defined as the hash of its content
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// Group subscriptions by type and screen payloads once for subs of the same type
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by, err := rlp.EncodeToBytes(streamFilters)
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if err != nil {
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log.Error(err)
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}
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subscriptionHash := crypto.Keccak256(by)
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subscriptionType := common.BytesToHash(subscriptionHash)
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subscription := Subscription{
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PayloadChan: sub,
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QuitChan: quitChan,
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}
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// If the subscription requests a backfill, use the Postgres index to lookup and retrieve historical data
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// Otherwise we only filter new data as it is streamed in from the state diffing geth node
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if streamFilters.BackFill || streamFilters.BackFillOnly {
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sap.backFill(subscription, id, streamFilters)
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}
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if !streamFilters.BackFillOnly {
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sap.Lock()
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if sap.Subscriptions[subscriptionType] == nil {
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sap.Subscriptions[subscriptionType] = make(map[rpc.ID]Subscription)
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}
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sap.Subscriptions[subscriptionType][id] = subscription
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sap.SubscriptionTypes[subscriptionType] = streamFilters
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sap.Unlock()
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}
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}
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func (sap *Service) backFill(sub Subscription, id rpc.ID, con config.Subscription) {
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log.Debug("back-filling data for id", id)
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// Retrieve cached CIDs relevant to this subscriber
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var endingBlock int64
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var startingBlock int64
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var err error
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startingBlock, err = sap.Retriever.RetrieveFirstBlockNumber()
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if err != nil {
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sub.PayloadChan <- streamer.SeedNodePayload{
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ErrMsg: "unable to set block range start; error: " + err.Error(),
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}
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}
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if startingBlock < con.StartingBlock.Int64() {
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startingBlock = con.StartingBlock.Int64()
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}
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endingBlock, err = sap.Retriever.RetrieveLastBlockNumber()
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if err != nil {
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sub.PayloadChan <- streamer.SeedNodePayload{
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ErrMsg: "unable to set block range end; error: " + err.Error(),
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}
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}
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if endingBlock > con.EndingBlock.Int64() && con.EndingBlock.Int64() > 0 && con.EndingBlock.Int64() > startingBlock {
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endingBlock = con.EndingBlock.Int64()
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}
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log.Debug("backfill starting block:", con.StartingBlock)
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log.Debug("backfill ending block:", endingBlock)
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// Backfilled payloads are sent concurrently to the streamed payloads, so the receiver needs to pay attention to
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// the blocknumbers in the payloads they receive to keep things in order
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// TODO: separate backfill into a different rpc subscription method altogether?
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go func() {
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for i := con.StartingBlock.Int64(); i <= endingBlock; i++ {
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cidWrapper, err := sap.Retriever.RetrieveCIDs(con, i)
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if err != nil {
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sub.PayloadChan <- streamer.SeedNodePayload{
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ErrMsg: "CID retrieval error: " + err.Error(),
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}
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continue
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}
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if ipfs.EmptyCIDWrapper(*cidWrapper) {
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continue
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}
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blocksWrapper, err := sap.Fetcher.FetchCIDs(*cidWrapper)
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if err != nil {
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log.Error(err)
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sub.PayloadChan <- streamer.SeedNodePayload{
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ErrMsg: "IPLD fetching error: " + err.Error(),
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}
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continue
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}
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backFillIplds, err := sap.Resolver.ResolveIPLDs(*blocksWrapper)
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if err != nil {
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log.Error(err)
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sub.PayloadChan <- streamer.SeedNodePayload{
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ErrMsg: "IPLD resolving error: " + err.Error(),
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}
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continue
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}
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select {
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case sub.PayloadChan <- backFillIplds:
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log.Infof("sending seed node back-fill payload to subscription %s", id)
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default:
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log.Infof("unable to send back-fill payload to subscription %s; channel has no receiver", id)
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}
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}
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}()
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}
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// Unsubscribe is used to unsubscribe to the StateDiffingService loop
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func (sap *Service) Unsubscribe(id rpc.ID) {
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log.Info("Unsubscribing from the seed node service")
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sap.Lock()
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for ty := range sap.Subscriptions {
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delete(sap.Subscriptions[ty], id)
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if len(sap.Subscriptions[ty]) == 0 {
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// If we removed the last subscription of this type, remove the subscription type outright
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delete(sap.Subscriptions, ty)
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delete(sap.SubscriptionTypes, ty)
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}
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}
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sap.Unlock()
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}
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// Start is used to begin the service
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func (sap *Service) Start(*p2p.Server) error {
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log.Info("Starting seed node service")
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wg := new(sync.WaitGroup)
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payloadChan := make(chan ipfs.IPLDPayload, payloadChanBufferSize)
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quitChan := make(chan bool, 1)
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if err := sap.SyncAndPublish(wg, payloadChan, quitChan); err != nil {
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return err
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}
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sap.ScreenAndServe(payloadChan, quitChan)
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return nil
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}
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// Stop is used to close down the service
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func (sap *Service) Stop() error {
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log.Info("Stopping seed node service")
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close(sap.QuitChan)
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return nil
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}
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// Node returns the Geth node info for this service
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func (sap *Service) Node() core.Node {
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return sap.gethNode
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}
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// close is used to close all listening subscriptions
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func (sap *Service) close() {
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sap.Lock()
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for ty, subs := range sap.Subscriptions {
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for id, sub := range subs {
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select {
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case sub.QuitChan <- true:
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log.Infof("closing subscription %s", id)
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default:
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log.Infof("unable to close subscription %s; channel has no receiver", id)
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}
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}
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delete(sap.Subscriptions, ty)
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delete(sap.SubscriptionTypes, ty)
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}
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sap.Unlock()
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}
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