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fix(ralph-loop): add inFlight guard and improve completion detection to prevent infinite loops

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Closes #2084
This commit is contained in:
YeonGyu-Kim 2026-02-26 20:58:55 +09:00
parent c505989ad4
commit a6617d93c0
4 changed files with 211 additions and 116 deletions
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4
src/hooks/ralph-loop/completion-promise-detector.ts
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@ -79,8 +79,8 @@ export async function detectCompletionInSessionMessages(
if (assistantMessages.length === 0) return false
const pattern = buildPromisePattern(options.promise)
const recentAssistants = assistantMessages.slice(-3)
for (const assistant of recentAssistants) {
for (let index = assistantMessages.length - 1; index >= 0; index -= 1) {
const assistant = assistantMessages[index]
if (!assistant.parts) continue
let responseText = ""

93
src/hooks/ralph-loop/index.test.ts
View File

@ -494,6 +494,7 @@ describe("ralph-loop", () => {
config: {
enabled: true,
default_max_iterations: 200,
default_strategy: "continue",
},
})
@ -708,6 +709,57 @@ describe("ralph-loop", () => {
expect(promptCalls[0].text).toContain("<promise>CALCULATOR_DONE</promise>")
})
test("should skip concurrent idle events for same session when handler is in flight", async () => {
// given - active loop with delayed prompt injection
let releasePromptAsync: (() => void) | undefined
const promptAsyncBlocked = new Promise<void>((resolve) => {
releasePromptAsync = resolve
})
let firstPromptStartedResolve: (() => void) | undefined
const firstPromptStarted = new Promise<void>((resolve) => {
firstPromptStartedResolve = resolve
})
const mockInput = createMockPluginInput() as {
client: {
session: {
promptAsync: (opts: { path: { id: string }; body: { parts: Array<{ type: string; text: string }> } }) => Promise<unknown>
}
}
}
const originalPromptAsync = mockInput.client.session.promptAsync
let promptAsyncCalls = 0
mockInput.client.session.promptAsync = async (opts) => {
promptAsyncCalls += 1
if (promptAsyncCalls === 1) {
firstPromptStartedResolve?.()
}
await promptAsyncBlocked
return originalPromptAsync(opts)
}
const hook = createRalphLoopHook(mockInput as Parameters<typeof createRalphLoopHook>[0])
hook.startLoop("session-123", "Build feature", { maxIterations: 10 })
// when - second idle arrives while first idle processing is still in flight
const firstIdle = hook.event({
event: { type: "session.idle", properties: { sessionID: "session-123" } },
})
await firstPromptStarted
const secondIdle = hook.event({
event: { type: "session.idle", properties: { sessionID: "session-123" } },
})
releasePromptAsync?.()
await Promise.all([firstIdle, secondIdle])
// then - only one continuation should be injected
expect(promptAsyncCalls).toBe(1)
expect(promptCalls.length).toBe(1)
expect(hook.getState()?.iteration).toBe(2)
})
test("should clear loop state on user abort (MessageAbortedError)", async () => {
// given - active loop
const hook = createRalphLoopHook(createMockPluginInput())
@ -782,8 +834,8 @@ describe("ralph-loop", () => {
expect(hook.getState()).toBeNull()
})
test("should NOT detect completion if promise is older than last 3 assistant messages", async () => {
// given - promise appears in an assistant message older than last 3
test("should detect completion even when promise is older than previous narrow window", async () => {
// given - promise appears in an older assistant message with additional assistant output after it
mockSessionMessages = [
{ info: { role: "user" }, parts: [{ type: "text", text: "Start task" }] },
{ info: { role: "assistant" }, parts: [{ type: "text", text: "Promise early <promise>DONE</promise>" }] },
@ -801,9 +853,40 @@ describe("ralph-loop", () => {
event: { type: "session.idle", properties: { sessionID: "session-123" } },
})
// then - loop should continue (promise is older than last 3 assistant messages)
expect(promptCalls.length).toBe(1)
expect(hook.getState()?.iteration).toBe(2)
// then - loop should complete because all assistant messages are scanned
expect(promptCalls.length).toBe(0)
expect(toastCalls.some((t) => t.title === "Ralph Loop Complete!")).toBe(true)
expect(hook.getState()).toBeNull()
})
test("should detect completion when many assistant messages are emitted after promise", async () => {
// given - completion promise followed by long assistant output sequence
mockSessionMessages = [
{ info: { role: "user" }, parts: [{ type: "text", text: "Start task" }] },
{ info: { role: "assistant" }, parts: [{ type: "text", text: "Done now <promise>DONE</promise>" }] },
]
for (let index = 1; index <= 25; index += 1) {
mockSessionMessages.push({
info: { role: "assistant" },
parts: [{ type: "text", text: `Post-completion assistant output ${index}` }],
})
}
const hook = createRalphLoopHook(createMockPluginInput(), {
getTranscriptPath: () => join(TEST_DIR, "nonexistent.jsonl"),
})
hook.startLoop("session-123", "Build something", { completionPromise: "DONE" })
// when - session goes idle
await hook.event({
event: { type: "session.idle", properties: { sessionID: "session-123" } },
})
// then - loop should complete despite large trailing output
expect(promptCalls.length).toBe(0)
expect(toastCalls.some((t) => t.title === "Ralph Loop Complete!")).toBe(true)
expect(hook.getState()).toBeNull()
})
test("should allow starting new loop while previous loop is active (different session)", async () => {

216
src/hooks/ralph-loop/ralph-loop-event-handler.ts
View File

@ -25,6 +25,8 @@ export function createRalphLoopEventHandler(
ctx: PluginInput,
options: RalphLoopEventHandlerOptions,
) {
const inFlightSessions = new Set<string>()
return async ({ event }: { event: { type: string; properties?: unknown } }): Promise<void> => {
const props = event.properties as Record<string, unknown> | undefined
@ -32,115 +34,127 @@ export function createRalphLoopEventHandler(
const sessionID = props?.sessionID as string | undefined
if (!sessionID) return
if (options.sessionRecovery.isRecovering(sessionID)) {
log(`[${HOOK_NAME}] Skipped: in recovery`, { sessionID })
if (inFlightSessions.has(sessionID)) {
log(`[${HOOK_NAME}] Skipped: handler in flight`, { sessionID })
return
}
const state = options.loopState.getState()
if (!state || !state.active) {
return
}
if (state.session_id && state.session_id !== sessionID) {
if (options.checkSessionExists) {
try {
const exists = await options.checkSessionExists(state.session_id)
if (!exists) {
options.loopState.clear()
log(`[${HOOK_NAME}] Cleared orphaned state from deleted session`, {
orphanedSessionId: state.session_id,
currentSessionId: sessionID,
})
return
}
} catch (err) {
log(`[${HOOK_NAME}] Failed to check session existence`, {
sessionId: state.session_id,
error: String(err),
})
}
}
return
}
const transcriptPath = options.getTranscriptPath(sessionID)
const completionViaTranscript = detectCompletionInTranscript(transcriptPath, state.completion_promise)
const completionViaApi = completionViaTranscript
? false
: await detectCompletionInSessionMessages(ctx, {
sessionID,
promise: state.completion_promise,
apiTimeoutMs: options.apiTimeoutMs,
directory: options.directory,
})
if (completionViaTranscript || completionViaApi) {
log(`[${HOOK_NAME}] Completion detected!`, {
sessionID,
iteration: state.iteration,
promise: state.completion_promise,
detectedVia: completionViaTranscript
? "transcript_file"
: "session_messages_api",
})
options.loopState.clear()
const title = state.ultrawork ? "ULTRAWORK LOOP COMPLETE!" : "Ralph Loop Complete!"
const message = state.ultrawork ? `JUST ULW ULW! Task completed after ${state.iteration} iteration(s)` : `Task completed after ${state.iteration} iteration(s)`
await ctx.client.tui?.showToast?.({ body: { title, message, variant: "success", duration: 5000 } }).catch(() => {})
return
}
if (state.iteration >= state.max_iterations) {
log(`[${HOOK_NAME}] Max iterations reached`, {
sessionID,
iteration: state.iteration,
max: state.max_iterations,
})
options.loopState.clear()
await ctx.client.tui?.showToast?.({
body: { title: "Ralph Loop Stopped", message: `Max iterations (${state.max_iterations}) reached without completion`, variant: "warning", duration: 5000 },
}).catch(() => {})
return
}
const newState = options.loopState.incrementIteration()
if (!newState) {
log(`[${HOOK_NAME}] Failed to increment iteration`, { sessionID })
return
}
log(`[${HOOK_NAME}] Continuing loop`, {
sessionID,
iteration: newState.iteration,
max: newState.max_iterations,
})
await ctx.client.tui?.showToast?.({
body: {
title: "Ralph Loop",
message: `Iteration ${newState.iteration}/${newState.max_iterations}`,
variant: "info",
duration: 2000,
},
}).catch(() => {})
inFlightSessions.add(sessionID)
try {
await continueIteration(ctx, newState, {
previousSessionID: sessionID,
directory: options.directory,
apiTimeoutMs: options.apiTimeoutMs,
loopState: options.loopState,
})
} catch (err) {
log(`[${HOOK_NAME}] Failed to inject continuation`, {
if (options.sessionRecovery.isRecovering(sessionID)) {
log(`[${HOOK_NAME}] Skipped: in recovery`, { sessionID })
return
}
const state = options.loopState.getState()
if (!state || !state.active) {
return
}
if (state.session_id && state.session_id !== sessionID) {
if (options.checkSessionExists) {
try {
const exists = await options.checkSessionExists(state.session_id)
if (!exists) {
options.loopState.clear()
log(`[${HOOK_NAME}] Cleared orphaned state from deleted session`, {
orphanedSessionId: state.session_id,
currentSessionId: sessionID,
})
return
}
} catch (err) {
log(`[${HOOK_NAME}] Failed to check session existence`, {
sessionId: state.session_id,
error: String(err),
})
}
}
return
}
const transcriptPath = options.getTranscriptPath(sessionID)
const completionViaTranscript = detectCompletionInTranscript(transcriptPath, state.completion_promise)
const completionViaApi = completionViaTranscript
? false
: await detectCompletionInSessionMessages(ctx, {
sessionID,
promise: state.completion_promise,
apiTimeoutMs: options.apiTimeoutMs,
directory: options.directory,
})
if (completionViaTranscript || completionViaApi) {
log(`[${HOOK_NAME}] Completion detected!`, {
sessionID,
iteration: state.iteration,
promise: state.completion_promise,
detectedVia: completionViaTranscript
? "transcript_file"
: "session_messages_api",
})
options.loopState.clear()
const title = state.ultrawork ? "ULTRAWORK LOOP COMPLETE!" : "Ralph Loop Complete!"
const message = state.ultrawork ? `JUST ULW ULW! Task completed after ${state.iteration} iteration(s)` : `Task completed after ${state.iteration} iteration(s)`
await ctx.client.tui?.showToast?.({ body: { title, message, variant: "success", duration: 5000 } }).catch(() => {})
return
}
if (state.iteration >= state.max_iterations) {
log(`[${HOOK_NAME}] Max iterations reached`, {
sessionID,
iteration: state.iteration,
max: state.max_iterations,
})
options.loopState.clear()
await ctx.client.tui?.showToast?.({
body: { title: "Ralph Loop Stopped", message: `Max iterations (${state.max_iterations}) reached without completion`, variant: "warning", duration: 5000 },
}).catch(() => {})
return
}
const newState = options.loopState.incrementIteration()
if (!newState) {
log(`[${HOOK_NAME}] Failed to increment iteration`, { sessionID })
return
}
log(`[${HOOK_NAME}] Continuing loop`, {
sessionID,
error: String(err),
iteration: newState.iteration,
max: newState.max_iterations,
})
await ctx.client.tui?.showToast?.({
body: {
title: "Ralph Loop",
message: `Iteration ${newState.iteration}/${newState.max_iterations}`,
variant: "info",
duration: 2000,
},
}).catch(() => {})
try {
await continueIteration(ctx, newState, {
previousSessionID: sessionID,
directory: options.directory,
apiTimeoutMs: options.apiTimeoutMs,
loopState: options.loopState,
})
} catch (err) {
log(`[${HOOK_NAME}] Failed to inject continuation`, {
sessionID,
error: String(err),
})
}
return
} finally {
inFlightSessions.delete(sessionID)
}
return
}
if (event.type === "session.deleted") {

14
src/hooks/ralph-loop/reset-strategy-race-condition.test.ts
View File

@ -36,7 +36,7 @@ async function waitUntil(condition: () => boolean): Promise<void> {
}
describe("ralph-loop reset strategy race condition", () => {
test("should continue iteration when old session idle arrives before TUI switch completes", async () => {
test("should skip duplicate idle while reset iteration handling is in flight", async () => {
// given - reset strategy loop with blocked TUI session switch
const promptCalls: Array<{ sessionID: string; text: string }> = []
const createSessionCalls: Array<{ parentID?: string }> = []
@ -85,7 +85,7 @@ describe("ralph-loop reset strategy race condition", () => {
},
},
},
} as Parameters<typeof createRalphLoopHook>[0])
} as unknown as Parameters<typeof createRalphLoopHook>[0])
hook.startLoop("session-old", "Build feature", { strategy: "reset" })
@ -100,14 +100,12 @@ describe("ralph-loop reset strategy race condition", () => {
event: { type: "session.idle", properties: { sessionID: "session-old" } },
})
await waitUntil(() => selectSessionCalls > 1)
selectSessionDeferred.resolve()
await Promise.all([firstIdleEvent, secondIdleEvent])
// then - second idle should not be skipped during reset transition
expect(createSessionCalls.length).toBe(2)
expect(promptCalls.length).toBe(2)
expect(hook.getState()?.iteration).toBe(3)
// then - duplicate idle should be skipped to prevent concurrent continuation injection
expect(createSessionCalls.length).toBe(1)
expect(promptCalls.length).toBe(1)
expect(hook.getState()?.iteration).toBe(2)
})
})