WIP: init supply verifier

Author: ffranr

universe/supplyverifier/env.go

@@ -0,0 +1,56 @@
+package supplyverifier
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/lightninglabs/taproot-assets/asset"
+	"github.com/lightninglabs/taproot-assets/tapgarden"
+	"github.com/lightninglabs/taproot-assets/universe/supplycommit"
+)
+
+// SupplyCommitView is an interface that is used to look up supply commitments
+// and pre-commitments.
+type SupplyCommitView interface {
+	// UnspentPrecommits returns the set of unspent pre-commitments for a
+	// given asset spec.
+	UnspentPrecommits(ctx context.Context,
+		assetSpec asset.Specifier) (supplycommit.PreCommits, error)
+
+	// SupplyCommit returns the latest supply commitment for a given asset
+	// spec.
+	SupplyCommit(ctx context.Context,
+		assetSpec asset.Specifier) (*supplycommit.RootCommitment, error)
+
+	// LastVerifiedCommitment returns the last verified supply commitment
+	// for a given asset spec.
+	LastVerifiedCommitment(ctx context.Context,
+		assetSpec asset.Specifier) (*supplycommit.RootCommitment, error)
+}
+
+// Environment is a struct that holds all the dependencies that the supply
+// verifier needs to carry out its duties.
+type Environment struct {
+	// AssetSpec is the asset specifier that is used to identify the asset
+	// that we're maintaining a supply commit for.
+	AssetSpec asset.Specifier
+
+	// Chain is our access to the current main chain.
+	Chain tapgarden.ChainBridge
+
+	// SupplyCommitView allows us to look up supply commitments and
+	// pre-commitments.
+	SupplyCommitView SupplyCommitView
+
+	// ErrChan is the channel that is used to send errors to the caller.
+	ErrChan chan<- error
+
+	// QuitChan is the channel that is used to signal that the state
+	// machine should quit.
+	QuitChan <-chan struct{}
+}
+
+// Name returns the name of the environment.
+func (e *Environment) Name() string {
+	return fmt.Sprintf("supply_verifier(%s)", e.AssetSpec.String())
+}