[alerter,webapp] 告警阈值触发表达式优化新增自定义equals函数,告警配置页面完善tip

alerter/src/main/java/com/usthe/alert/AlerterConfiguration.java

@@ -1,9 +1,14 @@
 package com.usthe.alert;
 
 import com.googlecode.aviator.AviatorEvaluator;
+import com.googlecode.aviator.runtime.function.AbstractFunction;
+import com.googlecode.aviator.runtime.type.AviatorBoolean;
+import com.googlecode.aviator.runtime.type.AviatorObject;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+import java.util.Map;
+
 /**
  * @author tomsun28
  * @date 2021/11/3 12:55
@@ -17,6 +22,31 @@ public class AlerterConfiguration {
     public void configAviatorEvaluator() {
         // 配置AviatorEvaluator使用LRU缓存编译后的表达式
         AviatorEvaluator.getInstance()
-                .useLRUExpressionCache(AVIATOR_LRU_CACHE_SIZE);
+                .useLRUExpressionCache(AVIATOR_LRU_CACHE_SIZE)
+                .addFunction(new StrEqualFunction());
+    }
+
+    /**
+     * 自定义aviator判断字符串是否相等函数
+     */
+    private static class StrEqualFunction extends AbstractFunction {
+        @Override
+        public AviatorObject call(Map<String, Object> env, AviatorObject arg1, AviatorObject arg2) {
+            if (arg1 == null || arg2 == null) {
+                return AviatorBoolean.valueOf(false);
+            }
+            Object leftTmp = arg1.getValue(env);
+            Object rightTmp = arg2.getValue(env);
+            if (leftTmp == null || rightTmp == null) {
+                return AviatorBoolean.valueOf(false);
+            }
+            String left = String.valueOf(leftTmp);
+            String right = String.valueOf(rightTmp);
+            return AviatorBoolean.valueOf(left.equalsIgnoreCase(right));
+        }
+        @Override
+        public String getName() {
+            return "equals";
+        }
     }
 }