vulcanizedb seed node streamer and syncPublishScreenAndServe command

cmd/syncAndPublish.go

@@ -46,10 +46,6 @@ it maintains a local index of the IPLD objects' CIDs in Postgres.`,
 	},
 }
 
-var (
-	ipfsPath string
-)
-
 func init() {
 	rootCmd.AddCommand(syncAndPublishCmd)
 	syncAndPublishCmd.Flags().StringVarP(&ipfsPath, "ipfs-path", "i", "~/.ipfs", "Path for configuring IPFS node")

cmd/syncPublishScreenAndServe.go

@@ -0,0 +1,73 @@
+// Copyright © 2019 Vulcanize, Inc
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	syn "sync"
+
+	"github.com/ethereum/go-ethereum/rpc"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	"github.com/vulcanize/vulcanizedb/pkg/ipfs"
+	"github.com/vulcanize/vulcanizedb/utils"
+)
+
+// syncPublishScreenAndServeCmd represents the syncPublishScreenAndServe command
+var syncPublishScreenAndServeCmd = &cobra.Command{
+	Use:   "syncPublishScreenAndServe",
+	Short: "A brief description of your command",
+	Long: `A longer description that spans multiple lines and likely contains examples
+and usage of using your command. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		syncPublishScreenAndServe()
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(syncPublishScreenAndServeCmd)
+	syncPublishScreenAndServeCmd.Flags().StringVarP(&ipfsPath, "ipfs-path", "i", "~/.ipfs", "Path for configuring IPFS node")
+	syncPublishScreenAndServeCmd.Flags().StringVarP(&vulcPath, "ipc-path", "p", "~/.vulcanize/vulcanize.ipc", "IPC path for the Vulcanize seed node server")
+}
+
+func syncPublishScreenAndServe() {
+	blockChain, ethClient, rpcClient := getBlockChainAndClients()
+
+	db := utils.LoadPostgres(databaseConfig, blockChain.Node())
+	quitChan := make(chan bool)
+	processor, err := ipfs.NewIPFSProcessor(ipfsPath, &db, ethClient, rpcClient, quitChan)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	wg := &syn.WaitGroup{}
+	forwardPayloadChan := make(chan ipfs.IPLDPayload)
+	forwardQuitChan := make(chan bool)
+	err = processor.SyncAndPublish(wg, forwardPayloadChan, forwardQuitChan)
+	if err != nil {
+		log.Fatal(err)
+	}
+	processor.ScreenAndServe(wg, forwardPayloadChan, forwardQuitChan)
+	_, _, err = rpc.StartIPCEndpoint(vulcPath, processor.APIs())
+	if err != nil {
+		log.Fatal(err)
+	}
+	wg.Wait()
+}

libraries/shared/streamer/streamer.go

@@ -0,0 +1,47 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program 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 Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Streamer is used by watchers to stream eth data from a vulcanizedb seed node
+package streamer
+
+import (
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/ipfs"
+)
+
+// IStreamer is the interface for streaming data from a vulcanizeDB seed node
+type IStreamer interface {
+	Stream(payloadChan chan ipfs.ResponsePayload, streamFilters ipfs.StreamFilters) (*rpc.ClientSubscription, error)
+}
+
+// Streamer is the underlying struct for the IStreamer interface
+type Streamer struct {
+	Client core.RpcClient
+}
+
+// NewSeedStreamer creates a pointer to a new Streamer which satisfies the IStreamer interface
+func NewSeedStreamer(client core.RpcClient) *Streamer {
+	return &Streamer{
+		Client: client,
+	}
+}
+
+// Stream is the main loop for subscribing to data from a vulcanizedb seed node
+func (sds *Streamer) Stream(payloadChan chan ipfs.ResponsePayload, streamFilters ipfs.StreamFilters) (*rpc.ClientSubscription, error) {
+	return sds.Client.Subscribe("vulcanizedb", payloadChan, "subscribe")
+}