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refactor(apiproxy): read subagent history like session history

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subagents.history drops its session-query read: a live child serves its
in-memory events with the registry watermark snapshot, a cold child goes
through inspectServable with a detached fold, and the retired
SESSION_QUERY_* arms disappear while every wire face stays put. The
design note records the shared read source.
This commit is contained in:
imccyu
2026-08-06 23:17:19 +08:00
parent ba791c0ac3
commit b9886d1615
6 changed files with 111 additions and 63 deletions
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79
packages/host/apiproxy/src/api-proxy.ts
View File

@@ -1918,44 +1918,63 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
parentSessionId, childSessionId, mode,
}, signal)
if (verified.error !== undefined) return err(request, verified.error)
try {
const snapshot = await ctx.sessionQuery.readSession(childSessionId)
signal?.throwIfAborted()
if (snapshot.session.parentSession !== parentSessionId) {
// The generic-history data plane: an attached child serves its
// in-memory snapshot and the registry's live watermark projections; a
// cold child is one persistence inspection plus a detached fold.
let header: SessionHeader
let events: SessionEvent[]
let projections: SessionProjectionsBlock | undefined
const attached = ctx.sessions.get(childSessionId)
if (attached !== undefined) {
header = attached.header
events = [...attached.events]
projections = beforeSeq === undefined ? projectionsFor(ctx, attached) : undefined
} else {
try {
const inspected = await inspectServable(childSessionId)
header = inspected.meta
events = inspected.events
projections = beforeSeq === undefined
? detachedProjectionsFor(ctx, inspected.events)
: undefined
} catch (error: unknown) {
if (signal?.aborted) {
return err(request, {
code: 'cancelled',
message: 'subagent history read was cancelled',
details: {},
})
}
if (error instanceof SessionNotFound) {
return err(request, {
code: 'subagent-not-found',
message: 'subagent disappeared during history read',
details: { parentSessionId, childSessionId },
})
}
return err(request, {
code: 'subagent-unauthorized',
message: 'subagent parent changed during history read',
details: { childSessionId },
})
}
const page = historyPage(ctx, snapshot.events, beforeSeq, maxMessages)
const projections = beforeSeq === undefined
? detachedProjectionsFor(ctx, snapshot.events)
: undefined
return ok(request, { ...page, ...projections === undefined ? {} : { projections } })
} catch (error: unknown) {
if (signal?.aborted
|| (error instanceof SessionQueryError && error.code === 'SESSION_QUERY_ABORTED')) {
return err(request, {
code: 'cancelled',
message: 'subagent history read was cancelled',
code: 'internal',
message: 'subagent history read failed',
details: {},
})
}
if (error instanceof SessionQueryError
&& error.code === 'SESSION_QUERY_SESSION_NOT_FOUND') {
return err(request, {
code: 'subagent-not-found',
message: 'subagent disappeared during history read',
details: { parentSessionId, childSessionId },
})
}
}
if (signal?.aborted) {
return err(request, {
code: 'internal',
message: 'subagent history read failed',
code: 'cancelled',
message: 'subagent history read was cancelled',
details: {},
})
}
if (header.parentSession !== parentSessionId) {
return err(request, {
code: 'subagent-unauthorized',
message: 'subagent parent changed during history read',
details: { childSessionId },
})
}
const page = historyPage(ctx, events, beforeSeq, maxMessages)
return ok(request, { ...page, ...projections === undefined ? {} : { projections } })
},
async prompt(request, signal) {