separate super node instances for different chains need to be within the same process to avoid contention over ipfs repo lock

cmd/superNode.go

@@ -18,6 +18,8 @@ package cmd
 import (
 	"sync"
 
+	"github.com/vulcanize/vulcanizedb/pkg/ipfs"
+
 	"github.com/ethereum/go-ethereum/rpc"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -53,48 +55,43 @@ func init() {
 }
 
 func superNode() {
-	superNode, superNodeConfig, err := newSuperNode()
+	superNodeConfigs, err := shared.NewSuperNodeConfigs()
 	if err != nil {
 		logWithCommand.Fatal(err)
 	}
+	if err := ipfs.InitIPFSPlugins(); err != nil {
+		logWithCommand.Fatal(err)
+	}
 	wg := &sync.WaitGroup{}
-	var forwardQuitChan chan bool
+	for _, superNodeConfig := range superNodeConfigs {
+		superNode, err := super_node.NewSuperNode(superNodeConfig)
+		if err != nil {
+			logWithCommand.Fatal(err)
+		}
 		var forwardPayloadChan chan shared.StreamedIPLDs
 		if superNodeConfig.Serve {
-		forwardQuitChan = make(chan bool)
 			forwardPayloadChan = make(chan shared.StreamedIPLDs, super_node.PayloadChanBufferSize)
-		superNode.ScreenAndServe(wg, forwardPayloadChan, forwardQuitChan)
+			superNode.ScreenAndServe(wg, forwardPayloadChan)
 			if err := startServers(superNode, superNodeConfig); err != nil {
 				logWithCommand.Fatal(err)
 			}
 		}
 		if superNodeConfig.Sync {
-		if err := superNode.SyncAndPublish(wg, forwardPayloadChan, forwardQuitChan); err != nil {
+			if err := superNode.SyncAndPublish(wg, forwardPayloadChan); err != nil {
 				logWithCommand.Fatal(err)
 			}
 		}
 		if superNodeConfig.BackFill {
-		backFiller, err := super_node.NewBackFillService(superNodeConfig)
+			backFiller, err := super_node.NewBackFillService(superNodeConfig, forwardPayloadChan)
 			if err != nil {
 				logWithCommand.Fatal(err)
 			}
-		backFiller.FillGaps(wg, nil)
+			backFiller.FillGaps(wg)
+		}
 	}
 	wg.Wait()
 }
 
-func newSuperNode() (super_node.SuperNode, *shared.SuperNodeConfig, error) {
-	superNodeConfig, err := shared.NewSuperNodeConfig()
-	if err != nil {
-		return nil, nil, err
-	}
-	sn, err := super_node.NewSuperNode(superNodeConfig)
-	if err != nil {
-		return nil, nil, err
-	}
-	return sn, superNodeConfig, nil
-}
-
 func startServers(superNode super_node.SuperNode, settings *shared.SuperNodeConfig) error {
 	_, _, err := rpc.StartIPCEndpoint(settings.IPCEndpoint, superNode.APIs())
 	if err != nil {
@@ -104,6 +101,6 @@ func startServers(superNode super_node.SuperNode, settings *shared.SuperNodeConf
 	if err != nil {
 		return err
 	}
-	_, _, err = rpc.StartHTTPEndpoint(settings.HTTPEndpoint, superNode.APIs(), []string{"eth", "btc"}, nil, nil, rpc.HTTPTimeouts{})
+	_, _, err = rpc.StartHTTPEndpoint(settings.HTTPEndpoint, superNode.APIs(), []string{settings.Chain.API()}, nil, nil, rpc.HTTPTimeouts{})
 	return err
 }

dockerfiles/super_node/Dockerfile

@@ -37,6 +37,8 @@ ARG USER
 ARG CONFIG_FILE
 ARG EXPOSE_PORT_1
 ARG EXPOSE_PORT_2
+ARG EXPOSE_PORT_3
+ARG EXPOSE_PORT_4
 
 RUN adduser -D 5000 $USER
 USER $USER
@@ -54,5 +56,7 @@ COPY --from=builder /go/src/github.com/ipfs/go-ipfs/ipfs ipfs
 
 EXPOSE $EXPOSE_PORT_1
 EXPOSE $EXPOSE_PORT_2
+EXPOSE $EXPOSE_PORT_3
+EXPOSE $EXPOSE_PORT_4
 
 CMD ["./startup_script.sh"]

documentation/super_node/setup.md

@@ -105,36 +105,69 @@ Usage:
 `./vulcanizedb superNode --config=<config_file.toml`
  
  
-The config file contains the parameters needed to initialize a SuperNode with the appropriate chain, settings, and services
+The config file contains the parameters needed to initialize a super node with the appropriate chain(s), settings, and services
-`./vulcanizedb syncAndPublish --config=<config_file.toml>`
 
+The below example spins up a super node for btc and eth
 ```toml
 [superNode]
-    chain = "ethereum"
+    chains = ["ethereum", "bitcoin"]
-    ipfsPath = "/root/.ipfs"
+    ipfsPath = "/Users/iannorden/.ipfs"
 
-    [superNode.database]
+    [superNode.ethereum.database]
-        name     = "vulcanize_public"
+        name     = "vulcanize_demo"
         hostname = "localhost"
         port     = 5432
-        user     = "ec2-user"
+        user     = "postgres"
 
-    [superNode.sync]
+    [superNode.ethereum.sync]
         on = true
         wsPath  = "ws://127.0.0.1:8546"
         workers = 1
 
-    [superNode.server]
+    [superNode.ethereum.server]
         on = true
-        ipcPath = "/root/.vulcanize/eth/vulcanize.ipc"
+        ipcPath = "/Users/iannorden/.vulcanize/eth/vulcanize.ipc"
         wsPath = "127.0.0.1:8080"
         httpPath = "127.0.0.1:8081"
 
-    [superNode.backFill]
+    [superNode.ethereum.backFill]
         on = true
         httpPath = "http://127.0.0.1:8545"
         frequency = 15
         batchSize = 50
+
+    [superNode.bitcoin.database]
+         name     = "vulcanize_demo"
+         hostname = "localhost"
+         port     = 5432
+         user     = "postgres"
+
+    [superNode.bitcoin.sync]
+         on = true
+         wsPath  = "127.0.0.1:8332"
+         workers = 1
+         pass = "GhhOhxL6GxteDhgzrTqj"
+         user = "ocdrpc"
+
+    [superNode.bitcoin.server]
+         on = true
+         ipcPath = "/Users/iannorden/.vulcanize/btc/vulcanize.ipc"
+         wsPath = "127.0.0.1:8082"
+         httpPath = "127.0.0.1:8083"
+
+    [superNode.bitcoin.backFill]
+         on = true
+         httpPath = "127.0.0.1:8332"
+         frequency = 15
+         batchSize = 50
+         pass = "GhhOhxL6GxteDhgzrTqj"
+         user = "ocdrpc"
+
+    [superNode.bitcoin.node]
+         nodeID = "ocd0"
+         clientName = "Omnicore"
+         genesisBlock = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
+         networkID = "0xD9B4BEF9"
 ```
 
 ### Dockerfile Setup
@@ -211,6 +244,6 @@ createdb vulcanize_public
 8. Build and run the Docker image
 ```
 cd $GOPATH/src/github.com/vulcanize/vulcanizedb/dockerfiles/super_node
-docker build --build-arg CONFIG_FILE=environments/ethSuperNode.toml --build-arg EXPOSE_PORT_1=8080 --build-arg EXPOSE_PORT_2=8081 .
+docker build --build-arg CONFIG_FILE=environments/superNode.toml --build-arg EXPOSE_PORT_1=8080 --build-arg EXPOSE_PORT_2=8081 EXPOSE_PORT_3=8082 --build-arg EXPOSE_PORT_4=8083 .
 docker run --network host -e IPFS_INIT=true -e VDB_PG_NAME=vulcanize_public -e VDB_PG_HOSTNAME=localhost -e VDB_PG_PORT=5432 -e VDB_PG_USER=postgres -e VDB_PG_PASSWORD=password {IMAGE_ID}
 ```

environments/btcSuperNode.toml

@@ -1,36 +0,0 @@
-[superNode]
-    chain = "bitcoin"
-    ipfsPath = "/root/.ipfs"
-
-    [superNode.database]
-        name     = "vulcanize_public"
-        hostname = "localhost"
-        port     = 5432
-        user     = "ec2-user"
-
-    [superNode.sync]
-        on = true
-        wsPath  = "127.0.0.1:8332"
-        workers = 1
-        pass = "password"
-        user = "username"
-
-    [superNode.server]
-        on = true
-        ipcPath = "/root/.vulcanize/btc/vulcanize.ipc"
-        wsPath = "127.0.0.1:8082"
-        httpPath = "127.0.0.1:8083"
-
-    [superNode.backFill]
-        on = true
-        httpPath = "127.0.0.1:8332"
-        frequency = 15
-        batchSize = 50
-        pass = "password"
-        user = "username"
-
-    [superNode.btc]
-        nodeID = "ocd0"
-        clientName = "Omnicore"
-        genesisBlock = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
-        networkID = "0xD9B4BEF9"

environments/ethSuperNode.toml

@@ -1,26 +0,0 @@
-[superNode]
-    chain = "ethereum"
-    ipfsPath = "/root/.ipfs"
-
-    [superNode.database]
-        name     = "vulcanize_public"
-        hostname = "localhost"
-        port     = 5432
-        user     = "ec2-user"
-
-    [superNode.sync]
-        on = true
-        wsPath  = "ws://127.0.0.1:8546"
-        workers = 1
-
-    [superNode.server]
-        on = true
-        ipcPath = "/root/.vulcanize/eth/vulcanize.ipc"
-        wsPath = "127.0.0.1:8080"
-        httpPath = "127.0.0.1:8081"
-
-    [superNode.backFill]
-        on = true
-        httpPath = "http://127.0.0.1:8545"
-        frequency = 15
-        batchSize = 50

environments/superNode.toml

@@ -0,0 +1,59 @@
+[superNode]
+    chains = ["ethereum", "bitcoin"]
+    ipfsPath = "/root/.ipfs"
+
+    [superNode.ethereum.database]
+        name     = "vulcanize_public"
+        hostname = "localhost"
+        port     = 5432
+        user     = "ec2-user"
+
+    [superNode.ethereum.sync]
+        on = true
+        wsPath  = "ws://127.0.0.1:8546"
+        workers = 1
+
+    [superNode.ethereum.server]
+        on = true
+        ipcPath = "/root/.vulcanize/eth/vulcanize.ipc"
+        wsPath = "127.0.0.1:8080"
+        httpPath = "127.0.0.1:8081"
+
+    [superNode.ethereum.backFill]
+        on = true
+        httpPath = "http://127.0.0.1:8545"
+        frequency = 15
+        batchSize = 50
+
+    [superNode.bitcoin.database]
+         name     = "vulcanize_public"
+         hostname = "localhost"
+         port     = 5432
+         user     = "ec2-user"
+
+    [superNode.bitcoin.sync]
+         on = true
+         wsPath  = "127.0.0.1:8332"
+         workers = 1
+         pass = "password"
+         user = "username"
+
+    [superNode.bitcoin.server]
+         on = true
+         ipcPath = "/root/.vulcanize/btc/vulcanize.ipc"
+         wsPath = "127.0.0.1:8082"
+         httpPath = "127.0.0.1:8083"
+
+    [superNode.bitcoin.backFill]
+         on = true
+         httpPath = "127.0.0.1:8332"
+         frequency = 15
+         batchSize = 50
+         pass = "password"
+         user = "username"
+
+    [superNode.bitcoin.node]
+         nodeID = "ocd0"
+         clientName = "Omnicore"
+         genesisBlock = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
+         networkID = "0xD9B4BEF9"

pkg/super_node/backfiller.go

@@ -36,7 +36,7 @@ const (
 // BackFillInterface for filling in gaps in the super node
 type BackFillInterface interface {
 	// Method for the super node to periodically check for and fill in gaps in its data using an archival node
-	FillGaps(wg *sync.WaitGroup, quitChan <-chan bool)
+	FillGaps(wg *sync.WaitGroup)
 }
 
 // BackFillService for filling in gaps in the super node
@@ -51,14 +51,18 @@ type BackFillService struct {
 	Retriever shared.CIDRetriever
 	// Interface for fetching payloads over at historical blocks; over http
 	Fetcher shared.PayloadFetcher
+	// Channel for forwarding backfill payloads to the ScreenAndServe process
+	ScreenAndServeChan chan shared.StreamedIPLDs
 	// Check frequency
 	GapCheckFrequency time.Duration
 	// Size of batch fetches
 	BatchSize uint64
+	// Channel for receiving quit signal
+	QuitChan chan bool
 }
 
 // NewBackFillService returns a new BackFillInterface
-func NewBackFillService(settings *shared.SuperNodeConfig) (BackFillInterface, error) {
+func NewBackFillService(settings *shared.SuperNodeConfig, screenAndServeChan chan shared.StreamedIPLDs) (BackFillInterface, error) {
 	publisher, err := NewIPLDPublisher(settings.Chain, settings.IPFSPath)
 	if err != nil {
 		return nil, err
@@ -91,19 +95,21 @@ func NewBackFillService(settings *shared.SuperNodeConfig) (BackFillInterface, er
 		Fetcher:            fetcher,
 		GapCheckFrequency:  settings.Frequency,
 		BatchSize:          batchSize,
+		ScreenAndServeChan: screenAndServeChan,
+		QuitChan:           settings.Quit,
 	}, nil
 }
 
 // FillGaps periodically checks for and fills in gaps in the super node db
 // this requires a core.RpcClient that is pointed at an archival node with the StateDiffAt method exposed
-func (bfs *BackFillService) FillGaps(wg *sync.WaitGroup, quitChan <-chan bool) {
+func (bfs *BackFillService) FillGaps(wg *sync.WaitGroup) {
 	ticker := time.NewTicker(bfs.GapCheckFrequency)
 	wg.Add(1)
 
 	go func() {
 		for {
 			select {
-			case <-quitChan:
+			case <-bfs.QuitChan:
 				log.Info("quiting FillGaps process")
 				wg.Done()
 				return
@@ -191,9 +197,11 @@ func (bfs *BackFillService) backFill(startingBlock, endingBlock uint64, errChan
 						errChan <- err
 						continue
 					}
-					// make backfiller a part of super_node service and forward these
+					// If there is a ScreenAndServe process listening, forward payload to it
-					// ipldPayload the the regular publishAndIndex and screenAndServe channels
+					select {
-					// this would allow us to stream backfilled data to subscribers
+					case bfs.ScreenAndServeChan <- ipldPayload:
+					default:
+					}
 					cidPayload, err := bfs.Publisher.Publish(ipldPayload)
 					if err != nil {
 						errChan <- err

pkg/super_node/backfiller_test.go

@@ -58,6 +58,7 @@ var _ = Describe("BackFiller", func() {
 					101: mocks.MockStateDiffPayload,
 				},
 			}
+			quitChan := make(chan bool, 1)
 			backfiller := &super_node.BackFillService{
 				Indexer:           mockCidRepo,
 				Publisher:         mockPublisher,
@@ -66,10 +67,10 @@ var _ = Describe("BackFiller", func() {
 				Retriever:         mockRetriever,
 				GapCheckFrequency: time.Second * 2,
 				BatchSize:         super_node.DefaultMaxBatchSize,
+				QuitChan:          quitChan,
 			}
 			wg := &sync.WaitGroup{}
-			quitChan := make(chan bool, 1)
+			backfiller.FillGaps(wg)
-			backfiller.FillGaps(wg, quitChan)
 			time.Sleep(time.Second * 3)
 			quitChan <- true
 			Expect(len(mockCidRepo.PassedCIDPayload)).To(Equal(2))
@@ -111,6 +112,7 @@ var _ = Describe("BackFiller", func() {
 					100: mocks.MockStateDiffPayload,
 				},
 			}
+			quitChan := make(chan bool, 1)
 			backfiller := &super_node.BackFillService{
 				Indexer:           mockCidRepo,
 				Publisher:         mockPublisher,
@@ -119,10 +121,10 @@ var _ = Describe("BackFiller", func() {
 				Retriever:         mockRetriever,
 				GapCheckFrequency: time.Second * 2,
 				BatchSize:         super_node.DefaultMaxBatchSize,
+				QuitChan:          quitChan,
 			}
 			wg := &sync.WaitGroup{}
-			quitChan := make(chan bool, 1)
+			backfiller.FillGaps(wg)
-			backfiller.FillGaps(wg, quitChan)
 			time.Sleep(time.Second * 3)
 			quitChan <- true
 			Expect(len(mockCidRepo.PassedCIDPayload)).To(Equal(1))
@@ -158,6 +160,7 @@ var _ = Describe("BackFiller", func() {
 					2: mocks.MockStateDiffPayload,
 				},
 			}
+			quitChan := make(chan bool, 1)
 			backfiller := &super_node.BackFillService{
 				Indexer:           mockCidRepo,
 				Publisher:         mockPublisher,
@@ -166,10 +169,10 @@ var _ = Describe("BackFiller", func() {
 				Retriever:         mockRetriever,
 				GapCheckFrequency: time.Second * 2,
 				BatchSize:         super_node.DefaultMaxBatchSize,
+				QuitChan:          quitChan,
 			}
 			wg := &sync.WaitGroup{}
-			quitChan := make(chan bool, 1)
+			backfiller.FillGaps(wg)
-			backfiller.FillGaps(wg, quitChan)
 			time.Sleep(time.Second * 3)
 			quitChan <- true
 			Expect(len(mockCidRepo.PassedCIDPayload)).To(Equal(2))

pkg/super_node/eth/mocks/converter.go

@@ -58,7 +58,7 @@ func (pc *IterativePayloadConverter) Convert(payload shared.RawChainData) (share
 		return nil, fmt.Errorf("convert expected payload type %T got %T", statediff.Payload{}, payload)
 	}
 	pc.PassedStatediffPayload = append(pc.PassedStatediffPayload, stateDiffPayload)
-	if len(pc.PassedStatediffPayload) < pc.iteration+1 {
+	if len(pc.ReturnIPLDPayload) < pc.iteration+1 {
 		return nil, fmt.Errorf("IterativePayloadConverter does not have a payload to return at iteration %d", pc.iteration)
 	}
 	returnPayload := pc.ReturnIPLDPayload[pc.iteration]

pkg/super_node/service.go

@@ -29,7 +29,6 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	"github.com/vulcanize/vulcanizedb/pkg/eth/core"
-	"github.com/vulcanize/vulcanizedb/pkg/ipfs"
 	"github.com/vulcanize/vulcanizedb/pkg/postgres"
 	"github.com/vulcanize/vulcanizedb/pkg/super_node/shared"
 )
@@ -45,9 +44,9 @@ type SuperNode interface {
 	// APIs(), Protocols(), Start() and Stop()
 	node.Service
 	// Main event loop for syncAndPublish processes
-	SyncAndPublish(wg *sync.WaitGroup, forwardPayloadChan chan<- shared.StreamedIPLDs, forwardQuitchan chan<- bool) error
+	SyncAndPublish(wg *sync.WaitGroup, forwardPayloadChan chan<- shared.StreamedIPLDs) error
 	// Main event loop for handling client pub-sub
-	ScreenAndServe(wg *sync.WaitGroup, screenAndServePayload <-chan shared.StreamedIPLDs, screenAndServeQuit <-chan bool)
+	ScreenAndServe(wg *sync.WaitGroup, screenAndServePayload <-chan shared.StreamedIPLDs)
 	// Method to subscribe to receive state diff processing output
 	Subscribe(id rpc.ID, sub chan<- SubscriptionPayload, quitChan chan<- bool, params shared.SubscriptionSettings)
 	// Method to unsubscribe from state diff processing
@@ -98,9 +97,6 @@ type Service struct {
 
 // NewSuperNode creates a new super_node.Interface using an underlying super_node.Service struct
 func NewSuperNode(settings *shared.SuperNodeConfig) (SuperNode, error) {
-	if err := ipfs.InitIPFSPlugins(); err != nil {
-		return nil, err
-	}
 	sn := new(Service)
 	var err error
 	// If we are syncing, initialize the needed interfaces
@@ -175,10 +171,10 @@ func (sap *Service) APIs() []rpc.API {
 	return append(apis, chainAPI)
 }
 
-// SyncAndPublish is the backend processing loop which streams data from geth, converts it to iplds, publishes them to ipfs, and indexes their cids
+// SyncAndPublish is the backend processing loop which streams data, converts it to iplds, publishes them to ipfs, and indexes their cids
 // This continues on no matter if or how many subscribers there are, it then forwards the data to the ScreenAndServe() loop
 // which filters and sends relevant data to client subscriptions, if there are any
-func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload chan<- shared.StreamedIPLDs, screenAndServeQuit chan<- bool) error {
+func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload chan<- shared.StreamedIPLDs) error {
 	sub, err := sap.Streamer.Stream(sap.PayloadChan)
 	if err != nil {
 		return err
@@ -187,11 +183,10 @@ func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload cha
 
 	// Channels for forwarding data to the publishAndIndex workers
 	publishAndIndexPayload := make(chan shared.StreamedIPLDs, PayloadChanBufferSize)
-	publishAndIndexQuit := make(chan bool, sap.WorkerPoolSize)
 	// publishAndIndex worker pool to handle publishing and indexing concurrently, while
 	// limiting the number of Postgres connections we can possibly open so as to prevent error
 	for i := 0; i < sap.WorkerPoolSize; i++ {
-		sap.publishAndIndex(i, publishAndIndexPayload, publishAndIndexQuit)
+		sap.publishAndIndex(i, publishAndIndexPayload)
 	}
 	go func() {
 		for {
@@ -208,25 +203,10 @@ func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload cha
 				default:
 				}
 				// Forward the payload to the publishAndIndex workers
-				select {
+				publishAndIndexPayload <- ipldPayload
-				case publishAndIndexPayload <- ipldPayload:
-				default:
-				}
 			case err := <-sub.Err():
 				log.Error(err)
 			case <-sap.QuitChan:
-				// If we have a ScreenAndServe process running, forward the quit signal to it
-				select {
-				case screenAndServeQuit <- true:
-				default:
-				}
-				// Also forward a quit signal for each of the publishAndIndex workers
-				for i := 0; i < sap.WorkerPoolSize; i++ {
-					select {
-					case publishAndIndexQuit <- true:
-					default:
-					}
-				}
 				log.Info("quiting SyncAndPublish process")
 				wg.Done()
 				return
@@ -237,7 +217,7 @@ func (sap *Service) SyncAndPublish(wg *sync.WaitGroup, screenAndServePayload cha
 	return nil
 }
 
-func (sap *Service) publishAndIndex(id int, publishAndIndexPayload <-chan shared.StreamedIPLDs, publishAndIndexQuit <-chan bool) {
+func (sap *Service) publishAndIndex(id int, publishAndIndexPayload <-chan shared.StreamedIPLDs) {
 	go func() {
 		for {
 			select {
@@ -250,9 +230,6 @@ func (sap *Service) publishAndIndex(id int, publishAndIndexPayload <-chan shared
 				if err := sap.Indexer.Index(cidPayload); err != nil {
 					log.Errorf("worker %d error: %v", id, err)
 				}
-			case <-publishAndIndexQuit:
-				log.Infof("quiting publishAndIndex worker %d", id)
-				return
 			}
 		}
 	}()
@@ -261,14 +238,14 @@ func (sap *Service) publishAndIndex(id int, publishAndIndexPayload <-chan shared
 
 // ScreenAndServe is the loop used to screen data streamed from the state diffing eth node
 // and send the appropriate portions of it to a requesting client subscription, according to their subscription configuration
-func (sap *Service) ScreenAndServe(wg *sync.WaitGroup, screenAndServePayload <-chan shared.StreamedIPLDs, screenAndServeQuit <-chan bool) {
+func (sap *Service) ScreenAndServe(wg *sync.WaitGroup, screenAndServePayload <-chan shared.StreamedIPLDs) {
 	wg.Add(1)
 	go func() {
 		for {
 			select {
 			case payload := <-screenAndServePayload:
 				sap.sendResponse(payload)
-			case <-screenAndServeQuit:
+			case <-sap.QuitChan:
 				log.Info("quiting ScreenAndServe process")
 				wg.Done()
 				return
@@ -422,11 +399,10 @@ func (sap *Service) Start(*p2p.Server) error {
 	log.Info("Starting super node service")
 	wg := new(sync.WaitGroup)
 	payloadChan := make(chan shared.StreamedIPLDs, PayloadChanBufferSize)
-	quitChan := make(chan bool, 1)
+	if err := sap.SyncAndPublish(wg, payloadChan); err != nil {
-	if err := sap.SyncAndPublish(wg, payloadChan, quitChan); err != nil {
 		return err
 	}
-	sap.ScreenAndServe(wg, payloadChan, quitChan)
+	sap.ScreenAndServe(wg, payloadChan)
 	return nil
 }
 

pkg/super_node/service_test.go

@@ -63,7 +63,7 @@ var _ = Describe("Service", func() {
 				QuitChan:       quitChan,
 				WorkerPoolSize: 1,
 			}
-			err := processor.SyncAndPublish(wg, nil, nil)
+			err := processor.SyncAndPublish(wg, nil)
 			Expect(err).ToNot(HaveOccurred())
 			time.Sleep(2 * time.Second)
 			quitChan <- true

pkg/super_node/shared/chain_type.go

@@ -44,6 +44,19 @@ func (c ChainType) String() string {
 	}
 }
 
+func (c ChainType) API() string {
+	switch c {
+	case Ethereum:
+		return "eth"
+	case Bitcoin:
+		return "btc"
+	case Omni:
+		return "omni"
+	default:
+		return ""
+	}
+}
+
 func NewChainType(name string) (ChainType, error) {
 	switch strings.ToLower(name) {
 	case "ethereum", "eth":

pkg/super_node/shared/config.go

@@ -17,6 +17,7 @@
 package shared
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"time"
@@ -61,21 +62,12 @@ type SuperNodeConfig struct {
 	BatchSize  uint64
 }
 
-// NewSuperNodeConfig is used to initialize a SuperNode config from a config .toml file
+// NewSuperNodeConfigs is used to initialize multiple SuperNode configs from a single config .toml file
-func NewSuperNodeConfig() (*SuperNodeConfig, error) {
+// Separate chain supernode instances need to be ran in the same process in order to avoid lock contention on the ipfs repository
-	sn := new(SuperNodeConfig)
+func NewSuperNodeConfigs() ([]*SuperNodeConfig, error) {
-	sn.DBConfig = config.Database{
+	chains := viper.GetStringSlice("superNode.chains")
-		Name:     viper.GetString("superNode.database.name"),
+	configs := make([]*SuperNodeConfig, len(chains))
-		Hostname: viper.GetString("superNode.database.hostname"),
-		Port:     viper.GetInt("superNode.database.port"),
-		User:     viper.GetString("superNode.database.user"),
-		Password: viper.GetString("superNode.database.password"),
-	}
 	var err error
-	sn.Chain, err = NewChainType(viper.GetString("superNode.chain"))
-	if err != nil {
-		return nil, err
-	}
 	ipfsPath := viper.GetString("superNode.ipfsPath")
 	if ipfsPath == "" {
 		home, err := os.UserHomeDir()
@@ -84,9 +76,22 @@ func NewSuperNodeConfig() (*SuperNodeConfig, error) {
 		}
 		ipfsPath = filepath.Join(home, ".ipfs")
 	}
+	for i, chain := range chains {
+		sn := new(SuperNodeConfig)
+		sn.Chain, err = NewChainType(chain)
+		if err != nil {
+			return nil, err
+		}
+		sn.DBConfig = config.Database{
+			Name:     viper.GetString(fmt.Sprintf("superNode.%s.database.name", chain)),
+			Hostname: viper.GetString(fmt.Sprintf("superNode.%s.database.hostname", chain)),
+			Port:     viper.GetInt(fmt.Sprintf("superNode.%s.database.port", chain)),
+			User:     viper.GetString(fmt.Sprintf("superNode.%s.database.user", chain)),
+			Password: viper.GetString(fmt.Sprintf("superNode.%s.database.password", chain)),
+		}
 		sn.IPFSPath = ipfsPath
-	sn.Serve = viper.GetBool("superNode.server.on")
+		sn.Serve = viper.GetBool(fmt.Sprintf("superNode.%s.server.on", chain))
-	sn.Sync = viper.GetBool("superNode.sync.on")
+		sn.Sync = viper.GetBool(fmt.Sprintf("superNode.%s.sync.on", chain))
 		if sn.Sync {
 			workers := viper.GetInt("superNode.sync.workers")
 			if workers < 1 {
@@ -95,31 +100,31 @@ func NewSuperNodeConfig() (*SuperNodeConfig, error) {
 			sn.Workers = workers
 			switch sn.Chain {
 			case Ethereum:
-			sn.NodeInfo, sn.WSClient, err = getEthNodeAndClient(viper.GetString("superNode.sync.wsPath"))
+				sn.NodeInfo, sn.WSClient, err = getEthNodeAndClient(viper.GetString("superNode.ethereum.sync.wsPath"))
 			case Bitcoin:
 				sn.NodeInfo = core.Node{
-				ID:           viper.GetString("superNode.btc.nodeID"),
+					ID:           viper.GetString("superNode.bitcoin.node.nodeID"),
-				ClientName:   viper.GetString("superNode.btc.clientName"),
+					ClientName:   viper.GetString("superNode.bitcoin.node.clientName"),
-				GenesisBlock: viper.GetString("superNode.btc.genesisBlock"),
+					GenesisBlock: viper.GetString("superNode.bitcoin.node.genesisBlock"),
-				NetworkID:    viper.GetString("superNode.btc.networkID"),
+					NetworkID:    viper.GetString("superNode.bitcoin.node.networkID"),
 				}
 				// For bitcoin we load in node info from the config because there is no RPC endpoint to retrieve this from the node
 				sn.WSClient = &rpcclient.ConnConfig{
-				Host:         viper.GetString("superNode.sync.wsPath"),
+					Host:         viper.GetString("superNode.bitcoin.sync.wsPath"),
 					HTTPPostMode: true, // Bitcoin core only supports HTTP POST mode
 					DisableTLS:   true, // Bitcoin core does not provide TLS by default
-				Pass:         viper.GetString("superNode.sync.pass"),
+					Pass:         viper.GetString("superNode.bitcoin.sync.pass"),
-				User:         viper.GetString("superNode.sync.user"),
+					User:         viper.GetString("superNode.bitcoin.sync.user"),
 				}
 			}
 		}
 		if sn.Serve {
-		wsPath := viper.GetString("superNode.server.wsPath")
+			wsPath := viper.GetString(fmt.Sprintf("superNode.%s.server.wsPath", chain))
 			if wsPath == "" {
 				wsPath = "ws://127.0.0.1:8546"
 			}
 			sn.WSEndpoint = wsPath
-		ipcPath := viper.GetString("superNode.server.ipcPath")
+			ipcPath := viper.GetString(fmt.Sprintf("superNode.%s.server.ipcPath", chain))
 			if ipcPath == "" {
 				home, err := os.UserHomeDir()
 				if err != nil {
@@ -128,7 +133,7 @@ func NewSuperNodeConfig() (*SuperNodeConfig, error) {
 				ipcPath = filepath.Join(home, ".vulcanize/vulcanize.ipc")
 			}
 			sn.IPCEndpoint = ipcPath
-		httpPath := viper.GetString("superNode.server.httpPath")
+			httpPath := viper.GetString(fmt.Sprintf("superNode.%s.server.httpPath", chain))
 			if httpPath == "" {
 				httpPath = "http://127.0.0.1:8545"
 			}
@@ -137,36 +142,38 @@ func NewSuperNodeConfig() (*SuperNodeConfig, error) {
 		db := utils.LoadPostgres(sn.DBConfig, sn.NodeInfo)
 		sn.DB = &db
 		sn.Quit = make(chan bool)
-	if viper.GetBool("superNode.backFill.on") {
+		if viper.GetBool(fmt.Sprintf("superNode.%s.backFill.on", chain)) {
-		if err := sn.BackFillFields(); err != nil {
+			if err := sn.BackFillFields(chain); err != nil {
 				return nil, err
 			}
 		}
-	return sn, err
+		configs[i] = sn
+	}
+	return configs, err
 }
 
 // BackFillFields is used to fill in the BackFill fields of the config
-func (sn *SuperNodeConfig) BackFillFields() error {
+func (sn *SuperNodeConfig) BackFillFields(chain string) error {
 	sn.BackFill = true
 	var httpClient interface{}
 	var err error
 	switch sn.Chain {
 	case Ethereum:
-		_, httpClient, err = getEthNodeAndClient(viper.GetString("superNode.backFill.httpPath"))
+		_, httpClient, err = getEthNodeAndClient(viper.GetString("superNode.ethereum.backFill.httpPath"))
 		if err != nil {
 			return err
 		}
 	case Bitcoin:
 		httpClient = &rpcclient.ConnConfig{
-			Host:         viper.GetString("superNode.backFill.httpPath"),
+			Host:         viper.GetString("superNode.bitcoin.backFill.httpPath"),
 			HTTPPostMode: true, // Bitcoin core only supports HTTP POST mode
 			DisableTLS:   true, // Bitcoin core does not provide TLS by default
-			Pass:         viper.GetString("superNode.backFill.pass"),
+			Pass:         viper.GetString("superNode.bitcoin.backFill.pass"),
-			User:         viper.GetString("superNode.backFill.user"),
+			User:         viper.GetString("superNode.bitcoin.backFill.user"),
 		}
 	}
 	sn.HTTPClient = httpClient
-	freq := viper.GetInt("superNode.backFill.frequency")
+	freq := viper.GetInt(fmt.Sprintf("superNode.%s.backFill.frequency", chain))
 	var frequency time.Duration
 	if freq <= 0 {
 		frequency = time.Second * 30
@@ -174,7 +181,7 @@ func (sn *SuperNodeConfig) BackFillFields() error {
 		frequency = time.Second * time.Duration(freq)
 	}
 	sn.Frequency = frequency
-	sn.BatchSize = uint64(viper.GetInt64("superNode.backFill.batchSize"))
+	sn.BatchSize = uint64(viper.GetInt64(fmt.Sprintf("superNode.%s.backFill.batchSize", chain)))
 	return nil
 }