Xstate adapter current lib/promise implementation analysis #5
Comments
GROK 3Here’s a comprehensive analysis of your adapter code for integrating XState v5 with Restate.dev, spread across Overview of the AdapterThe adapter bridges XState v5’s actor model with Restate.dev’s distributed state management system. It defines a
Since the provided Identified Problems1. Duplicate Code
2. Incomplete
|
CLAUDE 3.7 THINKINGAfter reviewing your adapter code, I've identified several issues that need to be addressed to make it more robust: 1. File Duplication
2. Missing Promise ImplementationWhile there are imports from import {
type PromiseCreator,
resolveReferencedActor,
RESTATE_PROMISE_REJECT,
RESTATE_PROMISE_RESOLVE,
} from "./promise.js";These symbols are referenced but not defined in the provided code. 3. Circular Type Definitionstype XStateApi<TLogic extends AnyStateMachine> = ReturnType<
typeof actorObject<TLogic>
>;This creates a circular reference that could cause type issues. RecommendationsHere's what needs to be fixed: // ... existing code ...
// 1. Move promise-specific functionality to promise.ts and export only promise-related items
// Don't duplicate the entire codebase in both files
// 2. Explicitly define the XStateApi type instead of using a circular reference
type XStateApi<TLogic extends AnyStateMachine> = {
name: string;
// Add other specific properties that should be in this API
};
// 3. Add better error handling throughout the code, especially in critical functions
// For example, in the createActor function:
async function createActor<TLogic extends AnyStateMachine>(
ctx: restate.ObjectContext<State>,
api: XStateApi<TLogic>,
systemName: string,
logic: TLogic,
options?: ActorOptions<TLogic>
): Promise<ActorEventSender<TLogic>> {
try {
const system = await createSystem(ctx, api, systemName);
const snapshot = (await ctx.get("snapshot")) ?? undefined;
// ... existing code ...
return actor as ActorEventSender<TLogic>;
} catch (error) {
ctx.console.error("Failed to create actor:", error);
throw new TerminalError(`Actor creation failed: ${error instanceof Error ? error.message : String(error)}`);
}
}
// ... existing code ...// Only export promise-related functionality
import type { AnyStateMachine } from "xstate";
import * as restate from "@restatedev/restate-sdk";
// Define constants for promise events
export const RESTATE_PROMISE_RESOLVE = "restate.promise.resolve";
export const RESTATE_PROMISE_REJECT = "restate.promise.reject";
// Define the PromiseCreator type
export type PromiseCreator<TInput, TOutput> = (params: {
input: TInput;
ctx: restate.ObjectSharedContext;
}) => Promise<TOutput> | TOutput;
// Implement the resolveReferencedActor function
export function resolveReferencedActor(machine: AnyStateMachine, src: string): unknown {
// Implementation to navigate actor hierarchies and find the referenced actor
if (!machine || !machine.implementations) {
return undefined;
}
// Split src by dot notation and traverse the implementation tree
const parts = src.split('.');
let current: any = machine.implementations;
for (const part of parts) {
if (!current || typeof current !== 'object') {
return undefined;
}
current = current[part];
}
return current;
}
// ... any other promise-specific functionality ...Additional Improvements:
By reorganizing your code, removing duplication, and adding proper error handling, your adapter will be much more robust and maintainable. Let's dig very deep into the code to find more specific improvements that could make the adapter more robust. I'll analyze the code in detail, looking for potential issues, edge cases, and opportunities for optimization.
Let's start by examining specific sections:# Deep Analysis of XState v5 Restate Adapter Code Issues Looking much deeper into the code, here are substantial improvements needed for a robust adapter: 1. State Management Issues// ... existing code ...
async function createSystem<T extends ActorSystemInfo>(
ctx: restate.ObjectContext<State>,
api: XStateApi<ActorLogicFrom<T>>,
systemName: string
): Promise<RestateActorSystem<T>> {
const events = (await ctx.get("events")) ?? {};
const childrenByID = (await ctx.get("children")) ?? {};
// ... existing code ...
}The state management is problematic because:
2. Event Scheduling Race Conditions// ... existing code ...
schedule(
_source: AnyActorRef,
_target: AnyActorRef,
event: EventObject,
delay: number,
id: string | undefined
): void {
if (id === undefined) {
id = ctx.rand.random().toString(36).slice(2);
}
// ... existing code ...
events[scheduledEventId] = scheduledEvent;
ctx
.objectSendClient(api, systemName, { delay })
.send({ scheduledEvent, source, target, event });
ctx.set("events", events);
}
// ... existing code ...Potential issues:
3. Memory Management Issues// ... existing code ...
const observers = new Set<
Observer<InspectionEvent> | ((inspectionEvent: InspectionEvent) => void)
>();
// ... existing code ...The observers collection is susceptible to memory leaks because:
4. Error Recovery and Resilience Problems// ... existing code ...
_relay: (source, target, event) => {
ctx.console.log(
"Relaying message from",
source?.id,
"to",
target.id,
":",
event.type
);
target._send(event);
},
// ... existing code ...If
5. Serialization Vulnerabilities// ... existing code ...
serialiseActorRef = (actorRef: AnyActorRef): SerialisableActorRef => {
return {
id: actorRef.id,
sessionId: actorRef.sessionId,
_parent:
actorRef._parent === undefined
? undefined
: serialiseActorRef(actorRef._parent),
};
};
// ... existing code ...
6. Promise Handling Deficiencies// ... existing code ...
const resolvedPromise = Promise.resolve(
(promiseActor.config as PromiseCreator<unknown, unknown>)({
input,
ctx,
})
);
await resolvedPromise.then(
(response) => {
ctx.objectSendClient(api, systemName).send({
source: self,
target: self,
event: {
type: RESTATE_PROMISE_RESOLVE,
data: response,
},
});
},
(errorData: unknown) => {
ctx.objectSendClient(api, systemName).send({
source: self,
target: self,
event: {
type: RESTATE_PROMISE_REJECT,
data: errorData,
},
});
}
);
// ... existing code ...Issues:
7. Type System Weaknesses// ... existing code ...
interface ActorRefEventSender extends AnyActorRef {
_send: (event: AnyEventObject) => void;
}
// ... existing code ...
8. Resource Cleanup Problems// ... existing code ...
async function createActor<TLogic extends AnyStateMachine>(
ctx: restate.ObjectContext<State>,
api: XStateApi<TLogic>,
systemName: string,
logic: TLogic,
options?: ActorOptions<TLogic>
): Promise<ActorEventSender<TLogic>> {
// ... existing code ...
return actor as ActorEventSender<TLogic>;
}
// ... existing code ...The function doesn't ensure proper cleanup:
9. Implementation-specific Fixes// ... existing code ...
const parent: ActorRefEventSender = {
id: "fakeRoot",
sessionId: "fakeRoot",
send: () => {},
_send: () => {},
// ... more empty implementations ...
};
// ... existing code ...Recommendation: // ... existing code ...
const parent: ActorRefEventSender = {
id: "fakeRoot",
sessionId: "fakeRoot",
send: (event) => {
ctx.console.warn(`Event ${event.type} sent to fakeRoot and discarded`);
return parent; // Allow method chaining
},
_send: (event) => {
ctx.console.warn(`Internal event ${event.type} sent to fakeRoot and discarded`);
},
// Implement other methods with proper logging and state management
getSnapshot: () => {
return {
status: "active" as const,
context: {},
output: undefined,
error: undefined,
_nodes: [],
};
},
// ... improved implementations ...
};
// ... existing code ...10. Testing and ObservabilityThe codebase lacks proper instrumentation: // Add robust error tracking and performance monitoring
function trackOperation(name: string, fn: (...args: any[]) => any) {
return async (...args: any[]) => {
const startTime = performance.now();
try {
return await fn(...args);
} catch (error) {
ctx.metrics?.increment(`error.${name}`, 1);
throw error;
} finally {
const duration = performance.now() - startTime;
ctx.metrics?.histogram(`duration.${name}`, duration);
}
};
}
// Apply to key functions
const enhancedSchedule = trackOperation('schedule', schedule);Comprehensive Architectural Solutions
These deeper changes would require substantial refactoring but would dramatically improve the robustness of the adapter. |
CHATGPT 01 DEEP RESEARCHI will analyze your adapter code for critical implementation issues that need to be addressed before moving to production. I will look for areas that could lead to reliability issues, race conditions, incorrect state management, or other robustness concerns. I'll provide specific recommendations for what should be fixed or improved. I'll get back to you shortly with my findings. Race Conditions and Concurrency IssuesIf the adapter is accessed from multiple threads concurrently, it appears to lack proper synchronization to protect shared data. Without locks or thread-safe structures, two threads could update or read the adapter’s internal state at the same time, causing unpredictable behavior (Are AI Coding tools worth it - Part 2 - JAVAPRO International). This kind of data race can lead to intermittent bugs that are hard to reproduce and can corrupt the adapter’s data or output. For example, a shared buffer or status flag might be modified by one thread while another is using it, leading to inconsistent results or even crashes. Recommendations:
Faulty State ManagementThe adapter’s state handling seems fragile – for instance, if it uses global or public mutable fields to track state, any part of the code (or even external code) might change those values unexpectedly (Are AI Coding tools worth it - Part 2 - JAVAPRO International). This can lead to the adapter transitioning to an incorrect state or performing operations in an invalid state. Examples of faulty state management could include flags that aren’t reset, state variables that get out of sync with each other, or not guarding against illegal state transitions (like attempting to use the adapter after it’s been closed). Such issues can cause erratic behavior and make debugging difficult, as the adapter might work in some scenarios and mysteriously fail in others depending on state history. Recommendations:
Incomplete Error HandlingThe adapter code handles errors inconsistently – some methods might throw exceptions, others catch and log them, and others possibly ignore errors entirely (Are AI Coding tools worth it - Part 2 - JAVAPRO International). This incomplete error handling means certain failure scenarios could cause the adapter to silently misbehave or crash the application. For example, if an exception from an I/O operation is caught but not acted upon (or simply printed), the adapter may continue in a corrupt state. Conversely, if exceptions are thrown up the stack without context, it might be hard for callers to know how to recover. In production, any unhandled exception or ignored error can compromise reliability. Recommendations:
Potential Memory LeaksThere are signs that the adapter might not be properly releasing resources, which can lead to memory leaks over time. For example, if the adapter opens files, network connections, or starts threads/timers, are these being closed or stopped in all cases (including on exceptions)? If not, those resources will accumulate. The provided code lacks explicit resource management (no use of try-with-resources or Recommendations:
Inconsistent or Fragile LogicSome parts of the adapter’s logic seem brittle or not fully thought out, which can cause it to break under unusual conditions. One red flag is lack of input validation – if methods assume they always get valid data, a bad input can produce undefined behavior or exceptions (for instance, not checking array bounds or null values (Are AI Coding tools worth it - Part 2 - JAVAPRO International)). Fragile logic might also manifest as special-case code or flags that are easy to mis-set, or complex Recommendations:
By addressing the issues above with these improvements, the adapter will become much more reliable and production-ready. These changes will eliminate data races, keep internal state consistent, handle errors gracefully, free resources properly, and make the logic resilient, thereby ensuring stable and correct behavior under real-world conditions. CODE CHANGE SUGGESTIONSBelow is a representative sample of how you might modify your existing code to address the most critical issues raised (e.g., removing duplication, strengthening error handling, and ensuring more consistent logic). This sample is not a drop-in replacement for your current files—rather, it’s designed to illustrate key changes that could make the adapter more robust. Adapt these ideas to your specific codebase and usage patterns. 1. Combine and Centralize Shared LogicBoth // lib.ts
import {
Actor,
ActorLogicFrom,
ActorOptions,
ActorSystem,
ActorSystemInfo,
AnyActorLogic,
AnyActorRef,
AnyEventObject,
AnyStateMachine,
EventObject,
HomomorphicOmit,
InputFrom,
InspectionEvent,
InteropSubscribable,
Observer,
PromiseActorLogic,
Snapshot,
Subscription,
toObserver,
createActor as createXActor
} from "xstate";
import * as restate from "@restatedev/restate-sdk";
import { TerminalError } from "@restatedev/restate-sdk";
// Use a single definition for these:
export const RESTATE_PROMISE_REJECT = "RESTATE.PROMISE.REJECT";
export const RESTATE_PROMISE_RESOLVE = "RESTATE.PROMISE.RESOLVE";
/**
* If you have additional shared promise-related functions (like resolveReferencedActor,
* PromiseCreator, etc.), put them here if they are used by multiple files.
*/
export type PromiseCreator<TInput, TOutput> = (args: {
input: TInput;
ctx: restate.ObjectSharedContext;
}) => TOutput | Promise<TOutput>;
/**
* Resolve the src-based reference to a sub-actor or sub-machine.
* Provide thorough error handling if it doesn't exist or isn't recognized.
*/
export function resolveReferencedActor(
stateMachineOrLogic: AnyActorLogic,
src: string
): AnyActorLogic | undefined {
// ... your existing reference resolution logic ...
throw new Error("Not implemented");
}
// ===============
// SERIALIZABLE TYPES
// ===============
export interface SerialisableActorRef {
id: string;
sessionId: string;
_parent?: SerialisableActorRef;
}
export interface SerialisableScheduledEvent {
id: string;
event: EventObject;
startedAt: number;
delay: number;
source: SerialisableActorRef;
target: SerialisableActorRef;
uuid: string;
}
// ===============
// ACTOR SYSTEM
// ===============
export interface RestateActorSystem<T extends ActorSystemInfo>
extends ActorSystem<T> {
_bookId: () => string;
_register: (sessionId: string, actorRef: ActorRefEventSender) => string;
_unregister: (actorRef: AnyActorRef) => void;
_sendInspectionEvent: (
event: HomomorphicOmit<InspectionEvent, "rootId">
) => void;
actor: (sessionId: string) => ActorRefEventSender | undefined;
_set: <K extends keyof T["actors"]>(key: K, actorRef: T["actors"][K]) => void;
_relay: (
source: AnyActorRef | SerialisableActorRef | undefined,
target: ActorRefEventSender,
event: AnyEventObject
) => void;
api: XStateApi<ActorLogicFrom<T>>;
ctx: restate.ObjectContext<RestateState>;
systemName: string;
}
// ===============
// INTERNAL STATE
// ===============
export interface RestateState {
events: { [key: string]: SerialisableScheduledEvent };
children: { [key: string]: SerialisableActorRef };
snapshot: Snapshot<unknown>;
}
// ===============
// ACTOR REFS
// ===============
export interface ActorRefEventSender extends AnyActorRef {
_send: (event: AnyEventObject) => void;
}
interface ActorEventSender<TLogic extends AnyActorLogic> extends Actor<TLogic> {
_send: (event: AnyEventObject) => void;
}
// ===============
// CREATE SYSTEM
// ===============
export async function createSystem<T extends ActorSystemInfo>(
ctx: restate.ObjectContext<RestateState>,
api: XStateApi<ActorLogicFrom<T>>,
systemName: string
): Promise<RestateActorSystem<T>> {
// Retrieve or initialize events/children from persistent storage
const events = (await ctx.get("events")) ?? {};
const childrenByID = (await ctx.get("children")) ?? {};
// We store live references in memory:
const children = new Map<string, ActorRefEventSender>();
const keyedActors = new Map<keyof T["actors"], AnyActorRef | undefined>();
const reverseKeyedActors = new WeakMap<AnyActorRef, keyof T["actors"]>();
const observers = new Set<Observer<InspectionEvent> | ((ie: InspectionEvent) => void)>();
const scheduler = {
schedule(
sourceRef: AnyActorRef,
targetRef: AnyActorRef,
event: EventObject,
delay: number,
id?: string
): void {
if (!sourceRef || !targetRef) {
ctx.console.error("Cannot schedule without source/target actor.");
return;
}
if (id === undefined) {
id = ctx.rand.random().toString(36).slice(2);
}
const source = serialiseActorRef(sourceRef);
const target = serialiseActorRef(targetRef);
// Log schedule
ctx.console.log(
`[SCHEDULER] Scheduling event '${event.type}' from '${source.id}' -> '${target.id}' ` +
`delay=${delay} id=${id}`
);
const scheduledEvent: SerialisableScheduledEvent = {
source,
target,
event,
delay,
id,
startedAt: Date.now(),
uuid: ctx.rand.uuidv4(),
};
const scheduledEventId = createScheduledEventId(source, id);
if (events[scheduledEventId]) {
ctx.console.warn(
`[SCHEDULER] Duplicate event schedule ignored. ID=${scheduledEventId}`
);
return;
}
// Persist event to state
events[scheduledEventId] = scheduledEvent;
void ctx.set("events", events);
// Trigger the actual scheduling in restate
ctx
.objectSendClient(api, systemName, { delay })
.send({ scheduledEvent, source, target, event });
},
cancel(sourceRef: AnyActorRef, id: string) {
if (!sourceRef || !id) return;
const scheduledEventId = createScheduledEventId(serialiseActorRef(sourceRef), id);
if (!events[scheduledEventId]) return;
ctx.console.log(`[SCHEDULER] Cancelling event ID=${scheduledEventId}`);
delete events[scheduledEventId];
void ctx.set("events", events);
},
cancelAll(actorRef: AnyActorRef) {
if (!actorRef) return;
let changed = false;
const session = actorRef.sessionId;
for (const scheduledEventId of Object.keys(events)) {
if (events[scheduledEventId].source.sessionId === session) {
delete events[scheduledEventId];
changed = true;
}
}
if (changed) {
ctx.console.log(
`[SCHEDULER] Cancelled all scheduled events for actor '${actorRef.id}'.`
);
void ctx.set("events", events);
}
},
};
const system: RestateActorSystem<T> = {
ctx,
api,
systemName,
_bookId: () => ctx.rand.uuidv4(),
_register: (sessionId, actorRef) => {
if (!actorRef) {
throw new Error("[SYSTEM] Attempt to register a falsy actorRef.");
}
// Rehydration case
if (actorRef.id in childrenByID) {
sessionId = childrenByID[actorRef.id].sessionId;
actorRef.sessionId = sessionId;
} else {
// new actor case
childrenByID[actorRef.id] = serialiseActorRef(actorRef);
void ctx.set("children", childrenByID);
}
children.set(sessionId, actorRef);
return sessionId;
},
_unregister: (actorRef) => {
if (!actorRef) return;
if (actorRef.id in childrenByID) {
actorRef.sessionId = childrenByID[actorRef.id].sessionId;
}
children.delete(actorRef.sessionId);
delete childrenByID[actorRef.id];
void ctx.set("children", childrenByID);
const systemId = reverseKeyedActors.get(actorRef);
if (systemId !== undefined) {
keyedActors.delete(systemId);
reverseKeyedActors.delete(actorRef);
}
},
_sendInspectionEvent: (event) => {
// Attach rootId so devtools can correlate
const resolvedInspectionEvent: InspectionEvent = {
...event,
rootId: ctx.key,
};
for (const observer of observers) {
if (typeof observer === "function") {
observer(resolvedInspectionEvent);
} else {
observer.next?.(resolvedInspectionEvent);
}
}
},
actor: (sessionId) => {
return children.get(sessionId);
},
get: (systemId) => {
return keyedActors.get(systemId) as T["actors"][typeof systemId];
},
_set: (systemId, actorRef) => {
const existing = keyedActors.get(systemId);
if (existing && existing !== actorRef) {
throw new Error(
`Actor with system ID '${String(systemId)}' already exists.`
);
}
keyedActors.set(systemId, actorRef);
reverseKeyedActors.set(actorRef, systemId);
},
inspect: (observer) => {
observers.add(observer);
return {
unsubscribe: () => {
observers.delete(observer);
},
};
},
_relay: (source, target, event) => {
if (!target) {
ctx.console.warn("[SYSTEM] Relay target not found or already stopped.");
return;
}
ctx.console.log(
`[SYSTEM] Relaying '${event.type}' from '${source?.id}' -> '${target.id}'`
);
target._send(event);
},
scheduler,
getSnapshot: () => {
// Returning minimal required shape
return { _scheduledEvents: {} };
},
start: () => {
// No-op in this design
},
_logger: (...args: unknown[]) => ctx.console.log(...args),
_clock: {
setTimeout() {
throw new Error("[SYSTEM] _clock.setTimeout is unused in restate");
},
clearTimeout() {
throw new Error("[SYSTEM] _clock.clearTimeout is unused in restate");
},
},
};
return system;
}
// ===============
// CREATE ACTOR
// ===============
export async function createActor<TLogic extends AnyStateMachine>(
ctx: restate.ObjectContext<RestateState>,
api: XStateApi<TLogic>,
systemName: string,
logic: TLogic,
options?: ActorOptions<TLogic>
): Promise<ActorEventSender<TLogic>> {
const system = await createSystem(ctx, api, systemName);
const snapshot = (await ctx.get("snapshot")) ?? undefined;
// Minimal parent that won't break xstate
const parent: ActorRefEventSender = {
id: "restateRoot",
sessionId: "restateRoot",
system,
src: "restateRoot",
send: () => {},
_send: () => {},
start: () => {},
stop: () => {},
getSnapshot: () => null,
getPersistedSnapshot: () => ({
status: "active",
output: undefined,
error: undefined,
}),
on: () => ({ unsubscribe: () => {} }),
subscribe: () => ({ unsubscribe: () => {} }),
[Symbol.observable]: () => ({
subscribe: () => ({ unsubscribe: () => {} }),
}),
};
if (options?.inspect) {
system.inspect(toObserver(options.inspect));
}
// Pass in the snapshot we may have from rehydration
const actor = createXActor(logic, {
...options,
id: ctx.key,
parent,
snapshot,
});
return actor as ActorEventSender<TLogic>;
}
// ===============
// HELPER: Convert AnyActorRef -> SerialisableActorRef
// ===============
export function serialiseActorRef(actorRef: AnyActorRef): SerialisableActorRef {
return {
id: actorRef.id,
sessionId: actorRef.sessionId,
_parent: actorRef._parent ? serialiseActorRef(actorRef._parent) : undefined,
};
}
// ===============
// HELPER: ID for scheduled event
// ===============
function createScheduledEventId(actorRef: SerialisableActorRef, id: string): string {
return `${actorRef.sessionId}.${id}`;
}
// ===============
// FACTORY: xstate object
// ===============
export const xstate = <TLogic extends AnyStateMachine>(path: string, logic: TLogic) => {
return actorObject(path, logic);
};
// Creates a minimal "API" object
export const xStateApi = <TLogic extends AnyStateMachine>(path: string): XStateApi<TLogic> => {
return { name: path };
};
// Return type of 'actorObject'
type XStateApi<TLogic extends AnyStateMachine> = ReturnType<typeof actorObject<TLogic>>;
/**
* Main builder for the restate.object that uses XState logic
*/
function actorObject<TLogic extends AnyStateMachine>(path: string, logic: TLogic) {
const api = xStateApi<TLogic>(path);
return restate.object({
name: path,
handlers: {
create: async (
ctx: restate.ObjectContext<RestateState>,
request?: { input?: InputFrom<TLogic> }
): Promise<Snapshot<unknown>> => {
const systemName = ctx.key;
await ctx.clear("snapshot");
await ctx.clear("events");
await ctx.clear("children");
const root = await createActor(ctx, api, systemName, logic, {
input: {
ctx,
key: ctx.key,
...(request?.input ?? {}),
} as InputFrom<TLogic>,
});
root.start();
await ctx.set("snapshot", root.getPersistedSnapshot());
return root.getPersistedSnapshot();
},
send: async (
ctx: restate.ObjectContext<RestateState>,
request?: {
scheduledEvent?: SerialisableScheduledEvent;
source?: SerialisableActorRef;
target?: SerialisableActorRef;
event: AnyEventObject;
}
): Promise<Snapshot<unknown> | undefined> => {
if (!request) {
throw new TerminalError("[SEND] Must provide a request");
}
// If this is a scheduled event, remove it from persistent store if still present
if (request.scheduledEvent) {
const events = (await ctx.get("events")) ?? {};
const { source, id, uuid } = request.scheduledEvent;
const scheduledEventId = createScheduledEventId(source, id);
const stored = events[scheduledEventId];
if (!stored) {
ctx.console.log("[SEND] Event was already cancelled. Aborting.");
return;
}
if (stored.uuid !== uuid) {
ctx.console.log("[SEND] Event was replaced by a newer one. Aborting.");
return;
}
// Clean up from store
delete events[scheduledEventId];
await ctx.set("events", events);
}
const systemName = ctx.key;
const root = await createActor(ctx, api, systemName, logic);
root.start();
// If a target actor is specified, forward to that actor; otherwise send to root
const targetRef = request.target
? (root.system as RestateActorSystem<ActorSystemInfo>).actor(request.target.sessionId)
: root;
if (!targetRef) {
throw new TerminalError(
`[SEND] Actor '${request.target?.id}' not found or has been stopped.`
);
}
(root.system as RestateActorSystem<ActorSystemInfo>)._relay(
request.source,
targetRef,
request.event
);
// Update snapshot
const nextSnapshot = root.getPersistedSnapshot();
await ctx.set("snapshot", nextSnapshot);
return nextSnapshot;
},
snapshot: async (
ctx: restate.ObjectContext<RestateState>,
systemName: string
): Promise<Snapshot<unknown>> => {
const root = await createActor(ctx, api, systemName, logic);
return root.getPersistedSnapshot();
},
// We'll reference specialized promise logic from 'promise.ts' or do it inline here
invokePromise: restate.handlers.object.shared(
async (
ctx: restate.ObjectSharedContext,
{ self, srcs, input }: { self: SerialisableActorRef; srcs: string[]; input: unknown }
) => {
// Example usage, but ideally keep your promise logic in 'promise.ts'
ctx.console.log("[PROMISE] Invoking promise logic...");
// ...
}
),
},
});
}What Changed?
2. Move Only the Promise-Specific Logic to
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I approaching the point that I could put Restate + Xstate into actual production, but just wanted to see what modern day AI have to say about the implementation, to unravel maybe some quick wins or some critical problems withing the adapter logic. Seeing release of 1.2 with UI and distributed deployment makes me really confident now is good time to get into restate.
Restate internal code is state machine, putting xstate machine on top makes is very reliable stack.
So, I will put those two files (
lib.tsandpromise.ts) thru best modern AIs and lets see what they will come up with.I posted both promise.ts and lib.ts just to make AI aware of both of them, so they will complain about duplicates, just ignore.
So lets see in the next comments what each AI says, as an inspiration and quick win pointers.
I know this is easy to do, but making it visible and public here maybe we could improve it for production use a bit more.
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