规则引擎

pkg/rule_engine/nodes/action_log_node.go

@@ -0,0 +1,41 @@
+package nodes
+
+import (
+	"fmt"
+	"log"
+	"pandax/pkg/rule_engine/message"
+)
+
+type logNode struct {
+	bareNode
+	Script string
+}
+
+type logNodeFactory struct{}
+
+func (f logNodeFactory) Name() string     { return "LogNode" }
+func (f logNodeFactory) Category() string { return NODE_CATEGORY_ACTION }
+func (f logNodeFactory) Create(id string, meta Metadata) (Node, error) {
+	labels := []string{"Success", "Failure"}
+	node := &logNode{
+		bareNode: newBareNode(f.Name(), id, meta, labels),
+	}
+	return decodePath(meta, node)
+}
+
+func (n *logNode) Handle(msg message.Message) error {
+	successLableNode := n.GetLinkedNode("Success")
+	failureLableNode := n.GetLinkedNode("Failure")
+
+	scriptEngine := NewScriptEngine()
+	logMessage, err := scriptEngine.ScriptToString(msg, n.Script)
+
+	if successLableNode == nil || failureLableNode == nil {
+		return fmt.Errorf("no valid label linked node in %s", n.Name())
+	}
+	if err != nil {
+		return failureLableNode.Handle(msg)
+	}
+	log.Println(logMessage)
+	return successLableNode.Handle(msg)
+}