Fix falsy values (0, empty string, false, null) silently dropped during serialization

packages/durabletask-js/src/worker/runtime-orchestration-context.ts

@@ -206,7 +206,7 @@ export class RuntimeOrchestrationContext extends OrchestrationContext {
 
     let resultJson;
 
-    if (result) {
+    if (result !== undefined) {
       resultJson = isResultEncoded ? result : JSON.stringify(result);
     }
 
@@ -252,7 +252,7 @@ export class RuntimeOrchestrationContext extends OrchestrationContext {
         // replayed when the new instance starts
         for (const [eventName, values] of Object.entries(this._receivedEvents)) {
           for (const eventValue of values) {
-            const encodedValue = eventValue ? JSON.stringify(eventValue) : undefined;
+            const encodedValue = eventValue !== undefined ? JSON.stringify(eventValue) : undefined;
             carryoverEvents.push(ph.newEventRaisedEvent(eventName, encodedValue));
           }
         }
@@ -261,7 +261,7 @@ export class RuntimeOrchestrationContext extends OrchestrationContext {
       const action = ph.newCompleteOrchestrationAction(
         this.nextSequenceNumber(),
         pb.OrchestrationStatus.ORCHESTRATION_STATUS_CONTINUED_AS_NEW,
-        this._newInput ? JSON.stringify(this._newInput) : undefined,
+        this._newInput !== undefined ? JSON.stringify(this._newInput) : undefined,
         undefined,
         carryoverEvents,
       );
@@ -308,7 +308,7 @@ export class RuntimeOrchestrationContext extends OrchestrationContext {
   ): Task<TOutput> {
     const id = this.nextSequenceNumber();
     const name = typeof activity === "string" ? activity : getName(activity);
-    const encodedInput = input ? JSON.stringify(input) : undefined;
+    const encodedInput = input !== undefined ? JSON.stringify(input) : undefined;
     const action = ph.newScheduleTaskAction(id, name, encodedInput, options?.tags, options?.version);
     this._pendingActions[action.getId()] = action;
 
@@ -339,7 +339,7 @@ export class RuntimeOrchestrationContext extends OrchestrationContext {
       instanceId = `${this._instanceId}:${instanceIdSuffix}`;
     }
 
-    const encodedInput = input ? JSON.stringify(input) : undefined;
+    const encodedInput = input !== undefined ? JSON.stringify(input) : undefined;
     const action = ph.newCreateSubOrchestrationAction(id, name, instanceId, encodedInput, options?.tags, options?.version);
     this._pendingActions[action.getId()] = action;
 

packages/durabletask-js/test/falsy-input-serialization.spec.ts

@@ -0,0 +1,188 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import { OrchestrationContext } from "../src/task/context/orchestration-context";
+import {
+  newExecutionStartedEvent,
+  newOrchestratorStartedEvent,
+} from "../src/utils/pb-helper.util";
+import { OrchestrationExecutor } from "../src/worker/orchestration-executor";
+import * as pb from "../src/proto/orchestrator_service_pb";
+import { Registry } from "../src/worker/registry";
+import { TOrchestrator } from "../src/types/orchestrator.type";
+import { NoOpLogger } from "../src/types/logger.type";
+import { ActivityContext } from "../src/task/context/activity-context";
+
+const testLogger = new NoOpLogger();
+const TEST_INSTANCE_ID = "falsy-test-instance";
+
+describe("Falsy input serialization", () => {
+  describe("callActivity with falsy inputs", () => {
+    it.each([
+      { input: 0, label: "zero" },
+      { input: "", label: "empty string" },
+      { input: false, label: "false" },
+      { input: null, label: "null" },
+    ])("should correctly serialize $label as activity input", async ({ input }) => {
+      const myActivity = async (_ctx: ActivityContext, actInput: any) => actInput;
+
+      const orchestrator: TOrchestrator = async function* (ctx: OrchestrationContext): any {
+        const result = yield ctx.callActivity(myActivity, input as any);
+        return result;
+      };
+
+      const registry = new Registry();
+      const orchestratorName = registry.addOrchestrator(orchestrator);
+      registry.addActivity(myActivity);
+
+      const newEvents = [
+        newOrchestratorStartedEvent(new Date()),
+        newExecutionStartedEvent(orchestratorName, TEST_INSTANCE_ID),
+      ];
+
+      const executor = new OrchestrationExecutor(registry, testLogger);
+      const result = await executor.execute(TEST_INSTANCE_ID, [], newEvents);
+
+      // Should have a ScheduleTask action with the serialized input
+      const scheduleAction = result.actions.find((a) => a.hasScheduletask());
+      expect(scheduleAction).toBeDefined();
+      const inputValue = scheduleAction!.getScheduletask()!.getInput();
+      expect(inputValue).toBeDefined();
+      expect(inputValue!.getValue()).toEqual(JSON.stringify(input));
+    });
+  });
+
+  describe("callSubOrchestrator with falsy inputs", () => {
+    it.each([
+      { input: 0, label: "zero" },
+      { input: "", label: "empty string" },
+      { input: false, label: "false" },
+      { input: null, label: "null" },
+    ])("should correctly serialize $label as sub-orchestration input", async ({ input }) => {
+      const subOrchestrator: TOrchestrator = async (_ctx: OrchestrationContext, subInput: any) => {
+        return subInput;
+      };
+
+      const orchestrator: TOrchestrator = async function* (ctx: OrchestrationContext): any {
+        const result = yield ctx.callSubOrchestrator(subOrchestrator, input as any);
+        return result;
+      };
+
+      const registry = new Registry();
+      const orchestratorName = registry.addOrchestrator(orchestrator);
+      registry.addOrchestrator(subOrchestrator);
+
+      const newEvents = [
+        newOrchestratorStartedEvent(new Date()),
+        newExecutionStartedEvent(orchestratorName, TEST_INSTANCE_ID),
+      ];
+
+      const executor = new OrchestrationExecutor(registry, testLogger);
+      const result = await executor.execute(TEST_INSTANCE_ID, [], newEvents);
+
+      // Should have a CreateSubOrchestration action with the serialized input
+      const subOrchAction = result.actions.find((a) => a.hasCreatesuborchestration());
+      expect(subOrchAction).toBeDefined();
+      const inputValue = subOrchAction!.getCreatesuborchestration()!.getInput();
+      expect(inputValue).toBeDefined();
+      expect(inputValue!.getValue()).toEqual(JSON.stringify(input));
+    });
+  });
+
+  describe("orchestration completion with falsy results", () => {
+    it.each([
+      { result: 0, label: "zero" },
+      { result: "", label: "empty string" },
+      { result: false, label: "false" },
+      { result: null, label: "null" },
+    ])("should correctly serialize $label as orchestration result", async ({ result }) => {
+      const orchestrator: TOrchestrator = async (_ctx: OrchestrationContext) => {
+        return result;
+      };
+
+      const registry = new Registry();
+      const orchestratorName = registry.addOrchestrator(orchestrator);
+
+      const newEvents = [
+        newOrchestratorStartedEvent(new Date()),
+        newExecutionStartedEvent(orchestratorName, TEST_INSTANCE_ID),
+      ];
+
+      const executor = new OrchestrationExecutor(registry, testLogger);
+      const execResult = await executor.execute(TEST_INSTANCE_ID, [], newEvents);
+
+      expect(execResult.actions.length).toEqual(1);
+      const completeAction = execResult.actions[0].getCompleteorchestration();
+      expect(completeAction).toBeDefined();
+      expect(completeAction!.getOrchestrationstatus()).toEqual(
+        pb.OrchestrationStatus.ORCHESTRATION_STATUS_COMPLETED,
+      );
+      const resultValue = completeAction!.getResult();
+      expect(resultValue).toBeDefined();
+      expect(resultValue!.getValue()).toEqual(JSON.stringify(result));
+    });
+  });
+
+  describe("continueAsNew with falsy input", () => {
+    it("should correctly serialize zero as continue-as-new input", async () => {
+      const orchestrator: TOrchestrator = async function* (ctx: OrchestrationContext, input: any): any {
+        if (input === 0) {
+          ctx.continueAsNew(0, false);
+          yield ctx.createTimer(1); // yield to avoid require-yield lint error
+          return;
+        }
+        return input;
+      };
+
+      const registry = new Registry();
+      const orchestratorName = registry.addOrchestrator(orchestrator);
+
+      const newEvents = [
+        newOrchestratorStartedEvent(new Date()),
+        newExecutionStartedEvent(orchestratorName, TEST_INSTANCE_ID, JSON.stringify(0)),
+      ];
+
+      const executor = new OrchestrationExecutor(registry, testLogger);
+      const result = await executor.execute(TEST_INSTANCE_ID, [], newEvents);
+
+      expect(result.actions.length).toEqual(1);
+      const completeAction = result.actions[0].getCompleteorchestration();
+      expect(completeAction).toBeDefined();
+      expect(completeAction!.getOrchestrationstatus()).toEqual(
+        pb.OrchestrationStatus.ORCHESTRATION_STATUS_CONTINUED_AS_NEW,
+      );
+      const resultValue = completeAction!.getResult();
+      expect(resultValue).toBeDefined();
+      expect(resultValue!.getValue()).toEqual(JSON.stringify(0));
+    });
+  });
+
+  describe("undefined inputs are still treated as no input", () => {
+    it("should not set input when activity input is undefined", async () => {
+      const myActivity = async (_ctx: ActivityContext) => "done";
+
+      const orchestrator: TOrchestrator = async function* (ctx: OrchestrationContext): any {
+        const result = yield ctx.callActivity(myActivity);
+        return result;
+      };
+
+      const registry = new Registry();
+      const orchestratorName = registry.addOrchestrator(orchestrator);
+      registry.addActivity(myActivity);
+
+      const newEvents = [
+        newOrchestratorStartedEvent(new Date()),
+        newExecutionStartedEvent(orchestratorName, TEST_INSTANCE_ID),
+      ];
+
+      const executor = new OrchestrationExecutor(registry, testLogger);
+      const result = await executor.execute(TEST_INSTANCE_ID, [], newEvents);
+
+      const scheduleAction = result.actions.find((a) => a.hasScheduletask());
+      expect(scheduleAction).toBeDefined();
+      // Input should be undefined/null when not provided
+      const inputValue = scheduleAction!.getScheduletask()!.getInput();
+      expect(inputValue).toBeUndefined();
+    });
+  });
+});