feat: copy event signature logic to error signatures

Signed-off-by: Simon Gellis <[email protected]>

Author: SupernaviX

internal/blockchain/cardano/cardano.go

@@ -432,8 +432,11 @@ func (c *Cardano) GenerateEventSignatureWithLocation(ctx context.Context, event
 }
 
 func (c *Cardano) GenerateErrorSignature(ctx context.Context, event *fftypes.FFIErrorDefinition) string {
-	// TODO: impl
-	return ""
+	params := []string{}
+	for _, param := range event.Params {
+		params = append(params, param.Schema.JSONObject().GetString("type"))
+	}
+	return fmt.Sprintf("%s(%s)", event.Name, strings.Join(params, ","))
 }
 
 func (c *Cardano) GenerateFFI(ctx context.Context, generationRequest *fftypes.FFIGenerationRequest) (*fftypes.FFI, error) {

internal/blockchain/cardano/cardano_test.go

@@ -1586,9 +1586,17 @@ func TestGenerateEventSignatureWithInvalidLocation(t *testing.T) {
 func TestGenerateErrorSignature(t *testing.T) {
 	c, cancel := newTestCardano()
 	defer cancel()
-
-	signature := c.GenerateErrorSignature(context.Background(), nil)
-	assert.Equal(t, "", signature)
+	event := &fftypes.FFIErrorDefinition{
+		Name: "TransactionFailed",
+		Params: fftypes.FFIParams{
+			&fftypes.FFIParam{
+				Name:   "transactionId",
+				Schema: fftypes.JSONAnyPtr(`{"type": "string"}`),
+			},
+		},
+	}
+	signature := c.GenerateErrorSignature(context.Background(), event)
+	assert.Equal(t, "TransactionFailed(string)", signature)
 }
 
 func TestCheckOverlappingLocationsEmpty(t *testing.T) {