feat: TLD auto-discovery (#199)

Author: agaffney

internal/config/config.go

@@ -91,8 +91,9 @@ var globalConfig = &Config{
 		Directory: "./.state",
 	},
 	Profiles: []string{
+		// NOTE: this is here because .ada wasn't added to the discovery address when it was originally deployed
 		"ada-preprod",
-		"hydra-preprod",
+		"auto-preprod",
 	},
 }
 

internal/config/profile.go

@@ -1,4 +1,4 @@
-// Copyright 2023 Blink Labs Software
+// Copyright 2024 Blink Labs Software
 //
 // Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file or at
@@ -7,12 +7,13 @@
 package config
 
 type Profile struct {
-	Network       string // Cardano network name
-	Tld           string // Top-level domain
-	PolicyId      string // Verification asset policy ID
-	ScriptAddress string // Address to follow
-	InterceptSlot uint64 // Chain-sync initial intercept slot
-	InterceptHash string // Chain-sync initial intercept hash
+	Network          string // Cardano network name
+	Tld              string // Top-level domain
+	PolicyId         string // Verification asset policy ID
+	ScriptAddress    string // Address to follow
+	InterceptSlot    uint64 // Chain-sync initial intercept slot
+	InterceptHash    string // Chain-sync initial intercept hash
+	DiscoveryAddress string // Auto-discovery address to follow
 }
 
 func GetProfiles() []Profile {
@@ -65,4 +66,12 @@ var Profiles = map[string]Profile{
 		InterceptSlot: 67799029,
 		InterceptHash: "4815dae9cd8f492ab51b109ba87d091ae85a0999af33ac459d8504122cb911f7",
 	},
+	"auto-preprod": Profile{
+		Network:          "preprod",
+		PolicyId:         "63cdaef8b84702282c3454ae130ada94a9b200e32be21abd47fc636b",
+		DiscoveryAddress: "addr_test1xrhqrug2hnc9az4ru02kp9rlfcppl464gl4yc8s8jm5p8kygc3uvcfh3r3kaa5gyk5l2vgdl8vj8cstslf4w2ajuy0wsp5fm89",
+		// The intercept slot/hash correspond to the block before the first TX on the above address
+		InterceptSlot: 67778432,
+		InterceptHash: "6db5cdcfa1ee9cc137b0b238ff9251d4481c23bf49ad6272cb833b034a003cbe",
+	},
 }

internal/indexer/datum.go

@@ -0,0 +1,48 @@
+// Copyright 2024 Blink Labs Software
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+package indexer
+
+import (
+	"fmt"
+
+	"github.com/blinklabs-io/gouroboros/cbor"
+)
+
+// DNSReferenceRefScriptDatum represents the auto-discovery datum type for scripts that handle DNS records
+type DNSReferenceRefScriptDatum struct {
+	// This allows the type to be used with cbor.DecodeGeneric
+	cbor.StructAsArray
+	TldName    []byte
+	SymbolDrat []byte
+	SymbolHns  []byte
+}
+
+func (d *DNSReferenceRefScriptDatum) UnmarshalCBOR(cborData []byte) error {
+	var tmpData cbor.Constructor
+	if _, err := cbor.Decode(cborData, &tmpData); err != nil {
+		return err
+	}
+	if tmpData.Constructor() != 3 {
+		return fmt.Errorf("unexpected outer constructor index: %d", tmpData.Constructor())
+	}
+	tmpDataFields := tmpData.Fields()
+	if len(tmpDataFields) != 1 {
+		return fmt.Errorf("unexpected inner field count: expected 1, got %d", len(tmpDataFields))
+	}
+	fieldInner, ok := tmpDataFields[0].(cbor.Constructor)
+	if !ok {
+		return fmt.Errorf("unexpected data type %T for outer constructor field", tmpDataFields[0])
+	}
+	var tmpDataInner cbor.Constructor
+	if _, err := cbor.Decode(fieldInner.Cbor(), &tmpDataInner); err != nil {
+		return err
+	}
+	if tmpDataInner.Constructor() != 1 {
+		return fmt.Errorf("unexpected inner constructor index: %d", tmpDataInner.Constructor())
+	}
+	return cbor.DecodeGeneric(tmpDataInner.FieldsCbor(), d)
+}