JS engine refactor - graal upgrade - JS functions can be passed around safely

karate-core/src/main/java/com/intuit/karate/JsonUtils.java

@@ -207,6 +207,16 @@ public static String toCsv(List<Map<String, Object>> list) {
         return sw.toString();
     }
 
+    public static Object shallowCopy(Object o) {
+        if (o instanceof List) {
+            return new ArrayList((List) o);
+        } else if (o instanceof Map) {
+            return new LinkedHashMap((Map) o);
+        } else {
+            return o;
+        }
+    }
+
     public static Object deepCopy(Object o) {
         // anti recursion / back-references
         Set<Object> seen = Collections.newSetFromMap(new IdentityHashMap());

karate-core/src/main/java/com/intuit/karate/core/Config.java

@@ -27,11 +27,8 @@
 import com.intuit.karate.StringUtils;
 import com.intuit.karate.driver.DockerTarget;
 import com.intuit.karate.driver.Target;
-import com.intuit.karate.graal.JsEngine;
-import com.intuit.karate.graal.JsFunction;
 import com.intuit.karate.http.Cookies;
 import com.intuit.karate.http.HttpLogModifier;
-import org.graalvm.polyglot.Value;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -110,38 +107,6 @@ public Config() {
         // zero arg constructor
     }
 
-    private static Variable attach(Variable v, JsEngine je) {
-        if (v.isJsFunctionWrapper()) {
-            JsFunction jf = v.getValue();
-            Value attached = je.attachSource(jf.source);
-            return new Variable(attached);
-        } else {
-            return v;
-        }
-    }
-
-    private static Variable detach(Variable v) {
-        if (v.isJsFunction()) {
-            return new Variable(new JsFunction(v.getValue()));
-        } else {
-            return v;
-        }
-    }
-
-    protected void attach(JsEngine je) {
-        afterScenario = attach(afterScenario, je);
-        afterFeature = attach(afterFeature, je);
-        headers = attach(headers, je);
-        cookies = attach(cookies, je);
-    }
-
-    protected void detach() {
-        afterScenario = detach(afterScenario);
-        afterFeature = detach(afterFeature);
-        headers = detach(headers);
-        cookies = detach(cookies);
-    }
-
     private static <T> T get(Map<String, Object> map, String key, T defaultValue) {
         Object o = map.get(key);
         return o == null ? defaultValue : (T) o;

karate-core/src/main/java/com/intuit/karate/core/MockHandler.java

@@ -117,7 +117,7 @@ public MockHandler(String prefix, List<Feature> features, Map<String, Object> ar
                 }
             }
             corsEnabled = corsEnabled || runtime.engine.getConfig().isCorsEnabled();
-            globals.putAll(runtime.engine.detachVariables());
+            globals.putAll(runtime.engine.shallowCloneVariables());
             runtime.logger.info("mock server initialized: {}", feature);
             this.features.put(feature, runtime);
         }
@@ -187,7 +187,7 @@ public synchronized Response handle(Request req) { // note the [synchronized]
                     responseStatus = engine.vars.remove(ScenarioEngine.RESPONSE_STATUS);
                     responseHeaders = engine.vars.remove(ScenarioEngine.RESPONSE_HEADERS);
                     responseDelay = engine.vars.remove(RESPONSE_DELAY);
-                    globals.putAll(engine.detachVariables());
+                    globals.putAll(engine.shallowCloneVariables());
                     Response res = new Response(200);
                     if (result.isFailed()) {
                         response = new Variable(result.getError().getMessage());

karate-core/src/main/java/com/intuit/karate/core/ScenarioBridge.java

@@ -43,7 +43,6 @@
 import com.intuit.karate.http.HttpRequest;
 import com.intuit.karate.http.HttpRequestBuilder;
 import com.intuit.karate.http.ResourceType;
-import com.intuit.karate.http.Response;
 import com.intuit.karate.http.WebSocketClient;
 import com.intuit.karate.http.WebSocketOptions;
 import com.intuit.karate.shell.Command;
@@ -180,9 +179,8 @@ private static Object callSingleResult(ScenarioEngine engine, Object o) throws E
             engine.logger.warn("callSingle() cached result is an exception");
             throw (Exception) o;
         }
-        // if we don't clone, an attach operation would update the tree within the cached value
-        // causing future cache hit + attach attempts to fail !
-        o = engine.recurseAndAttachAndShallowClone(o);
+        // shallow clone so that threads see the same data snapshot
+        o = JsonUtils.shallowCopy(o);
         return JsValue.fromJava(o);
     }
 
@@ -257,8 +255,7 @@ public Object callSingle(String fileName, Value arg) throws Exception {
                         engine.logger.warn("callSingleCache write failed, not json-like: {}", resultVar);
                     }
                 }
-                // functions have to be detached so that they can be re-hydrated in another js context
-                result = engine.recurseAndDetachAndShallowClone(resultVar.getValue());
+                result = resultVar.getValue();
             }
             CACHE.put(fileName, result);
             engine.logger.info("<< lock released, cached callSingle: {}", fileName);
@@ -739,10 +736,10 @@ public Object repeat(int n, Value f) {
         }
         return new JsList(list);
     }
-    
+
     public String responseHeader(String name) {
         return getEngine().getResponse().getHeader(name);
-    }    
+    }
 
     // set multiple variables in one shot
     public void set(Map<String, Object> map) {
@@ -879,12 +876,7 @@ public String toCsv(Object o) {
     }
 
     public Object toJava(Value value) {
-        if (value.canExecute()) {
-            JsEngine copy = getEngine().JS.copy();
-            return new JsLambda(copy.attach(value));
-        } else {
-            return new JsValue(value).getValue();
-        }
+        return new JsValue(value).getValue();
     }
 
     public File toJavaFile(String path) {
@@ -980,8 +972,7 @@ public WebSocketClient webSocket(String url, Value listener, Value value) {
         if (listener == null || !listener.canExecute()) {
             handler = m -> true;
         } else {
-            JsEngine copy = engine.JS.copy();
-            handler = new JsLambda(copy.attach(listener));
+            handler = new JsLambda(listener);
         }
         WebSocketOptions options = new WebSocketOptions(url, value == null ? null : new JsValue(value).getValue());
         options.setTextHandler(handler);
@@ -1002,8 +993,7 @@ public WebSocketClient webSocketBinary(String url, Value listener, Value value)
         if (listener == null || !listener.canExecute()) {
             handler = m -> true;
         } else {
-            JsEngine copy = engine.JS.copy();
-            handler = new JsLambda(copy.attach(listener));
+            handler = new JsLambda(listener);
         }
         WebSocketOptions options = new WebSocketOptions(url, value == null ? null : new JsValue(value).getValue());
         options.setBinaryHandler(handler);