feat: indexer persistence

.gitignore

@@ -20,7 +20,10 @@
 # Go workspace file
 go.work
 
-bluefin
+/bluefin
 
 # seed phrase... DO NOT REMOVE
 seed.txt
+
+# State dir for local testing
+/.state

cmd/bluefin/main.go

@@ -22,6 +22,7 @@ import (
 	"github.com/blinklabs-io/bluefin/internal/config"
 	"github.com/blinklabs-io/bluefin/internal/indexer"
 	"github.com/blinklabs-io/bluefin/internal/logging"
+	"github.com/blinklabs-io/bluefin/internal/state"
 	"github.com/blinklabs-io/bluefin/internal/wallet"
 )
 
@@ -52,6 +53,11 @@ func main() {
 		}
 	}()
 
+	// Load state
+	if err := state.GetState().Load(); err != nil {
+		logger.Fatalf("failed to load state: %s", err)
+	}
+
 	// Setup wallet
 	wallet.Setup()
 	bursa := wallet.GetWallet()

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/blinklabs-io/bursa v0.2.0
 	github.com/blinklabs-io/gouroboros v0.52.0
 	github.com/blinklabs-io/snek v0.7.0
+	github.com/dgraph-io/badger/v4 v4.2.0
 	github.com/kelseyhightower/envconfig v1.4.0
 	go.uber.org/zap v1.25.0
 	gopkg.in/yaml.v2 v2.4.0
@@ -19,12 +20,26 @@ require (
 
 require (
 	github.com/btcsuite/btcutil v1.0.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgraph-io/ristretto v0.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
 	github.com/fivebinaries/go-cardano-serialization v0.0.0-20220907134105-ec9b85086588 // indirect
 	github.com/fxamacker/cbor/v2 v2.4.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/glog v1.0.0 // indirect
+	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/snappy v0.0.3 // indirect
+	github.com/google/flatbuffers v1.12.1 // indirect
 	github.com/jinzhu/copier v0.4.0 // indirect
+	github.com/klauspost/compress v1.12.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/tyler-smith/go-bip39 v1.1.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
+	go.opencensus.io v0.22.5 // indirect
 	go.uber.org/multierr v1.10.0 // indirect
 	golang.org/x/crypto v0.12.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
 	golang.org/x/sys v0.11.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
 github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A=
 github.com/blinklabs-io/bursa v0.2.0 h1:C14bkl+bB7jamH4E5LqNpGxvXjSBl1YMaU+E9Z3rx2c=
@@ -16,58 +18,155 @@ github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVa
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+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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 github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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internal/config/config.go

@@ -23,6 +23,7 @@ import (
 )
 
 type Config struct {
+	State   StateConfig   `yaml:"state"`
 	Indexer IndexerConfig `yaml:"indexer"`
 	Wallet  WalletConfig  `yaml:"wallet"`
 	Logging LoggingConfig `yaml:"logging"`
@@ -41,6 +42,10 @@ type IndexerConfig struct {
 	InterceptSlot uint64 `yaml:"interceptSlot" envconfig:"INDEXER_INTERCEPT_SLOT"`
 }
 
+type StateConfig struct {
+	Directory string `yaml:"dir" envconfig:"STATE_DIR"`
+}
+
 type WalletConfig struct {
 	Mnemonic string `yaml:"mnemonic" envconfig:"MNEMONIC"`
 }
@@ -94,6 +99,10 @@ var globalConfig = &Config{
 		InterceptHash: "94476abbe95c1505bfb8d56b697c348ebae63ac58f9d9f976e8c8a331588d01a",
 		InterceptSlot: 101511708,
 	},
+	State: StateConfig{
+		// TODO: pick a better location
+		Directory: "./.state",
+	},
 }
 
 func Load(configFile string) (*Config, error) {

internal/indexer/indexer.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/blinklabs-io/bluefin/internal/config"
 	"github.com/blinklabs-io/bluefin/internal/logging"
+	"github.com/blinklabs-io/bluefin/internal/state"
 	"github.com/blinklabs-io/bluefin/internal/wallet"
 
 	"github.com/blinklabs-io/gouroboros/cbor"
@@ -46,7 +47,11 @@ func (i *Indexer) Start() error {
 	i.pipeline = pipeline.New()
 	// Configure pipeline input
 	inputOpts := []input_chainsync.ChainSyncOptionFunc{
-		//input_chainsync.WithIntersectTip(true),
+		input_chainsync.WithStatusUpdateFunc(func(status input_chainsync.ChainSyncStatus) {
+			if err := state.GetState().UpdateCursor(status.SlotNumber, status.BlockHash); err != nil {
+				logger.Errorf("failed to update cursor: %s", err)
+			}
+		}),
 	}
 	if cfg.Indexer.NetworkMagic > 0 {
 		inputOpts = append(
@@ -59,7 +64,28 @@ func (i *Indexer) Start() error {
 			input_chainsync.WithNetwork(cfg.Indexer.Network),
 		)
 	}
-	if cfg.Indexer.InterceptHash != "" && cfg.Indexer.InterceptSlot > 0 {
+	cursorSlotNumber, cursorBlockHash, err := state.GetState().GetCursor()
+	if err != nil {
+		return err
+	}
+	if cursorSlotNumber > 0 {
+		logger.Infof("found previous chainsync cursor: %d, %s", cursorSlotNumber, cursorBlockHash)
+		hashBytes, err := hex.DecodeString(cursorBlockHash)
+		if err != nil {
+			return err
+		}
+		inputOpts = append(
+			inputOpts,
+			input_chainsync.WithIntersectPoints(
+				[]ocommon.Point{
+					{
+						Hash: hashBytes,
+						Slot: cursorSlotNumber,
+					},
+				},
+			),
+		)
+	} else if cfg.Indexer.InterceptHash != "" && cfg.Indexer.InterceptSlot > 0 {
 		hashBytes, err := hex.DecodeString(cfg.Indexer.InterceptHash)
 		if err != nil {
 			return err