mint - add CLN support

.env.mint.example

@@ -20,14 +20,19 @@ MINTING_MAX_AMOUNT=50000
 # max melt amount (in sats)
 MELTING_MAX_AMOUNT=50000
 
-# Lightning Backend - Lnd, FakeBackend (FOR TESTING ONLY)
+# Lightning Backend - Lnd, CLN, FakeBackend (FOR TESTING ONLY)
 LIGHTNING_BACKEND="Lnd"
 
 # LND
 LND_GRPC_HOST="127.0.0.1:10001"
 LND_CERT_PATH="/path/to/tls/cert"
 LND_MACAROON_PATH="/path/to/macaroon"
 
+# CLN
+CLN_REST_URL="http://127.0.0.1:3030"
+CLN_CERT_PATH="/path/to/cert"
+CLN_REST_RUNE_PATH="/path/to/rune"
+
 # enable MPP/NUT-15 (disabled by default)
 # ENABLE_MPP=TRUE
 

.github/workflows/ci.yml

@@ -32,8 +32,11 @@ jobs:
         - name: Fuzz Uint64 subtraction
           run: go test -v -fuzz=FuzzUnderflowSubUint64 -fuzztime=60s ./cashu
 
-    integration-tests:
+    mint-integration-tests:
         runs-on: ubuntu-latest
+        strategy:
+          matrix:
+            backend: [LND, CLN]
         steps:
         - uses: actions/checkout@v4
 
@@ -42,6 +45,18 @@ jobs:
           with:
             go-version: 1.23.7
 
-        - name: Integration Tests
-          run: go test -v --tags=integration ./mint
-        - run: go test -v --tags=integration ./wallet
+        - name: Mint Integration Tests
+          run: go test -v --tags=integration ./mint -args -backend ${{ matrix.backend }}
+
+    wallet-integration-tests:
+        runs-on: ubuntu-latest
+        steps:
+        - uses: actions/checkout@v4
+
+        - name: Set up Go
+          uses: actions/setup-go@v4
+          with:
+            go-version: 1.23.7
+
+        - name: Wallet Integration Tests 
+          run: go test -v --tags=integration ./wallet

cmd/mint/mint.go

@@ -126,9 +126,8 @@ func configFromEnv() (*mint.Config, error) {
 	}
 
 	var lightningClient lightning.Client
-	switch os.Getenv("LIGHTNING_BACKEND") {
-	case "Lnd":
-		// read values for setting up LND
+	switch strings.ToUpper(os.Getenv("LIGHTNING_BACKEND")) {
+	case "LND":
 		host := os.Getenv("LND_GRPC_HOST")
 		if host == "" {
 			return nil, errors.New("LND_GRPC_HOST cannot be empty")
@@ -170,8 +169,35 @@ func configFromEnv() (*mint.Config, error) {
 		if err != nil {
 			return nil, fmt.Errorf("error setting LND client: %v", err)
 		}
-	case "FakeBackend":
+
+	case "CLN":
+		restURL := os.Getenv("CLN_REST_URL")
+		if restURL == "" {
+			return nil, errors.New("CLN_REST_URL cannot be empty")
+		}
+		runePath := os.Getenv("CLN_REST_RUNE_PATH")
+		if runePath == "" {
+			return nil, errors.New("CLN_REST_RUNE_PATH cannot be empty")
+		}
+
+		rune, err := os.ReadFile(runePath)
+		if err != nil {
+			return nil, fmt.Errorf("error reading macaroon: os.ReadFile %v", err)
+		}
+
+		clnConfig := lightning.CLNConfig{
+			RestURL: restURL,
+			Rune:    string(rune),
+		}
+
+		lightningClient, err = lightning.SetupCLNClient(clnConfig)
+		if err != nil {
+			return nil, fmt.Errorf("error setting up CLN client: %v", err)
+		}
+
+	case "FAKEBACKEND":
 		lightningClient = &lightning.FakeBackend{}
+
 	default:
 		return nil, errors.New("invalid lightning backend")
 	}