chore: signing behind interface

CHANGELOG.md

@@ -36,3 +36,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## Unreleased
+
+### Improvements
+
+* [#20](https://github.com/babylonlabs-io/covenant-emulator/pull/20) Add signing behind
+interface.

cmd/covd/key.go

@@ -9,7 +9,7 @@ import (
 	"github.com/urfave/cli"
 
 	covcfg "github.com/babylonlabs-io/covenant-emulator/config"
-	"github.com/babylonlabs-io/covenant-emulator/covenant"
+	"github.com/babylonlabs-io/covenant-emulator/keyring"
 )
 
 type covenantKey struct {
@@ -71,7 +71,7 @@ func createKey(ctx *cli.Context) error {
 		return fmt.Errorf("failed to load the config from %s: %w", covcfg.ConfigFile(homePath), err)
 	}
 
-	keyPair, err := covenant.CreateCovenantKey(
+	keyPair, err := keyring.CreateCovenantKey(
 		homePath,
 		chainID,
 		keyName,

cmd/covd/start.go

@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 
 	covcfg "github.com/babylonlabs-io/covenant-emulator/config"
+	"github.com/babylonlabs-io/covenant-emulator/keyring"
 	"github.com/babylonlabs-io/covenant-emulator/log"
 	"github.com/babylonlabs-io/covenant-emulator/util"
 
@@ -57,7 +58,14 @@ func start(ctx *cli.Context) error {
 		return fmt.Errorf("failed to create rpc client for the consumer chain: %w", err)
 	}
 
-	ce, err := covenant.NewCovenantEmulator(cfg, bbnClient, ctx.String(passphraseFlag), logger)
+	pwd := ctx.String(passphraseFlag)
+
+	signer, err := newSignerFromConfig(cfg, pwd)
+	if err != nil {
+		return fmt.Errorf("failed to create signer from config: %w", err)
+	}
+
+	ce, err := covenant.NewCovenantEmulator(cfg, bbnClient, logger, signer)
 	if err != nil {
 		return fmt.Errorf("failed to start the covenant emulator: %w", err)
 	}
@@ -75,3 +83,13 @@ func start(ctx *cli.Context) error {
 
 	return srv.RunUntilShutdown()
 }
+
+func newSignerFromConfig(cfg *covcfg.Config, passphrase string) (*keyring.KeyringSigner, error) {
+	return keyring.NewKeyringSigner(
+		cfg.BabylonConfig.ChainID,
+		cfg.BabylonConfig.Key,
+		cfg.BabylonConfig.KeyDirectory,
+		cfg.BabylonConfig.KeyringBackend,
+		passphrase,
+	)
+}