fix: check rule exists before create

internal/processor/rule.go

@@ -235,6 +235,12 @@ func clone(opt api.RuleOption) *api.RuleOption {
 	}
 }
 
+func (p *RuleProcessor) ExecExists(name string) bool {
+	var s1 string
+	f, _ := p.db.Get(name, &s1)
+	return f
+}
+
 func (p *RuleProcessor) ExecDesc(name string) (string, error) {
 	var s1 string
 	f, _ := p.db.Get(name, &s1)

internal/server/rest_test.go

@@ -793,3 +793,26 @@ func (suite *RestTestSuite) TestCreateRuleReplacePasswd() {
 	require.True(suite.T(), ok)
 	require.Equal(suite.T(), "4444", c["password"])
 }
+
+func (suite *RestTestSuite) TestCreateDuplicateRule() {
+	buf1 := bytes.NewBuffer([]byte(`{"sql":"CREATE stream demo123() WITH (DATASOURCE=\"0\", TYPE=\"mqtt\")"}`))
+	req1, _ := http.NewRequest(http.MethodPost, "http://localhost:8080/streams", buf1)
+	w1 := httptest.NewRecorder()
+	suite.r.ServeHTTP(w1, req1)
+
+	ruleJson2 := `{"id":"test12345","triggered":false,"sql":"select * from demo123","actions":[{"log":{}}]}`
+	buf2 := bytes.NewBuffer([]byte(ruleJson2))
+	req2, _ := http.NewRequest(http.MethodPost, "http://localhost:8080/rules", buf2)
+	w2 := httptest.NewRecorder()
+	suite.r.ServeHTTP(w2, req2)
+	require.Equal(suite.T(), http.StatusCreated, w2.Code)
+
+	buf2 = bytes.NewBuffer([]byte(ruleJson2))
+	req2, _ = http.NewRequest(http.MethodPost, "http://localhost:8080/rules", buf2)
+	w2 = httptest.NewRecorder()
+	suite.r.ServeHTTP(w2, req2)
+	require.Equal(suite.T(), http.StatusBadRequest, w2.Code)
+	var returnVal []byte
+	returnVal, _ = io.ReadAll(w2.Result().Body)
+	require.Equal(suite.T(), `{"error":1000,"message":"rule test12345 already exists"}`+"\n", string(returnVal))
+}

internal/server/rule_manager.go

@@ -75,16 +75,25 @@ func (rr *RuleRegistry) Delete(key string) (*rule.RuleState, bool) {
 	return result, ok
 }
 
-func createRule(name, ruleJson string) (string, error) {
+func createRule(name, ruleJson string) (id string, err error) {
 	var rs *rule.RuleState = nil
-	var err error = nil
+	defer func() {
+		if err != nil {
+			// Do not store to registry so also delete the KV
+			deleteRule(id)
+		}
+	}()
 
 	// Validate the rule json
 	r, err := ruleProcessor.GetRuleByJson(name, ruleJson)
 	if err != nil {
 		return "", fmt.Errorf("invalid rule json: %v", err)
 	}
 
+	if exists := ruleProcessor.ExecExists(r.Id); exists {
+		return r.Id, fmt.Errorf("rule %v already exists", r.Id)
+	}
+
 	// Validate the topo
 	err = infra.SafeRun(func() error {
 		rs, err = createRuleState(r)
@@ -97,8 +106,6 @@ func createRule(name, ruleJson string) (string, error) {
 	// Store to KV
 	err = ruleProcessor.ExecCreate(r.Id, ruleJson)
 	if err != nil {
-		// Do not store to registry so also delete the KV
-		deleteRule(r.Id)
 		return r.Id, fmt.Errorf("store the rule error: %v", err)
 	}