runtime-v2: hasFlow function (#813)

runtime/v2/runner/src/main/java/com/walmartlabs/concord/runtime/v2/runner/el/LazyExpressionEvaluator.java

@@ -209,6 +209,7 @@ private static FunctionMapper createFunctionMapper() {
         functions.put("evalAsMap", EvalAsMapFunction.getMethod());
         functions.put("isDebug", IsDebugFunction.getMethod());
         functions.put("throw", ThrowFunction.getMethod());
+        functions.put("hasFlow", HasFlowFunction.getMethod());
         functions.put("uuid", UuidFunction.getMethod());
         return new FunctionMapper(functions);
     }

runtime/v2/runner/src/main/java/com/walmartlabs/concord/runtime/v2/runner/el/functions/HasFlowFunction.java

@@ -0,0 +1,63 @@
+package com.walmartlabs.concord.runtime.v2.runner.el.functions;
+
+/*-
+ * *****
+ * Concord
+ * -----
+ * Copyright (C) 2017 - 2023 Walmart Inc.
+ * -----
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * =====
+ */
+
+import com.walmartlabs.concord.runtime.v2.model.ProcessDefinition;
+import com.walmartlabs.concord.runtime.v2.model.Profile;
+import com.walmartlabs.concord.runtime.v2.runner.el.ThreadLocalEvalContext;
+import com.walmartlabs.concord.runtime.v2.sdk.Context;
+
+import java.lang.reflect.Method;
+
+public final class HasFlowFunction {
+
+    public static Method getMethod() {
+        try {
+            return HasFlowFunction.class.getMethod("hasFlow", String.class);
+        } catch (Exception e) {
+            throw new RuntimeException("Method not found");
+        }
+    }
+
+    public static boolean hasFlow(String name) {
+        if (name == null || name.trim().isEmpty()) {
+            return false;
+        }
+
+        Context ctx = ThreadLocalEvalContext.get().context();
+        if (ctx == null) {
+            return false;
+        }
+
+        ProcessDefinition pd = ctx.execution().processDefinition();
+        if (pd.flows().containsKey(name)) {
+            return true;
+        }
+
+        for (String activeProfile : ctx.processConfiguration().processInfo().activeProfiles()) {
+            boolean fromProfile = pd.profiles().getOrDefault(activeProfile, Profile.builder().build()).flows().containsKey(name);
+            if (fromProfile) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

runtime/v2/runner/src/test/java/com/walmartlabs/concord/runtime/v2/runner/MainTest.java

@@ -1530,6 +1530,18 @@ public void testArrayEvalSerialize() throws Exception {
         assertLog(log, ".*" + Pattern.quote("{dev=dev-cloud1}, {prod=prod-cloud1}, {test=test-cloud1}, {perf=perf-cloud2}, {ci=perf-ci}") + ".*");
     }
 
+    @Test
+    public void testHasFlow() throws Exception {
+        deploy("hasFlow");
+
+        save(ProcessConfiguration.builder()
+                .build());
+
+        byte[] log = run();
+        assertLog(log, ".*123: false.*");
+        assertLog(log, ".*myFlow: true.*");
+    }
+
     @Test
     public void testUuidFunc() throws Exception {
         deploy("uuid");

runtime/v2/runner/src/test/resources/com/walmartlabs/concord/runtime/v2/runner/hasFlow/concord.yml

@@ -0,0 +1,7 @@
+flows:
+  default:
+    - log: "123: ${hasFlow('123')}"
+    - log: "myFlow: ${hasFlow('myFlow')}"
+
+  myFlow:
+    - log: "my"