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refactor(host): share the fenced-live-agent resolution between agentFor paths

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The live fast-path fence and the raced-collision catch duplicated the same
subagent-ownership classification, tripping the duplication gate. Extract
`fencedLiveAgent` so both paths resolve one live identity through the
fence identically.
This commit is contained in:
Tianyi Cui
2026-08-02 13:58:22 +08:00
parent dabb710ab3
commit dbe053fe08
1 changed files with 19 additions and 15 deletions
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34
packages/host/apiproxy/src/api-proxy.ts
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@@ -1065,17 +1065,24 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
return inspected
}
async function agentFor(sessionId: SessionId): Promise<{ agent: Agent } | { error: RpcError }> {
/**
* Resolve one live registered identity through the subagent-ownership
* fence: subagent-owned agents answer `agent-busy`, plain agents pass.
* Fences the live agent's own session rather than trusting a
* "registered ⇒ attached-store" invariant — a registered subagent whose
* session is ever absent from the attached store must still not be handed
* out through generic Host routing. `undefined` means no live agent.
*/
function fencedLiveAgent(sessionId: SessionId): { agent: Agent } | { error: RpcError } | undefined {
const live = ctx.agents.get(sessionId)
if (live !== undefined) {
// Fence the live agent's own session rather than trusting a
// "registered ⇒ attached-store" invariant: a registered subagent whose
// session is ever absent from the attached store must still not be
// handed out through generic Host routing (ensureSession's `.catch`
// already fences `live.session`; this is the same check on the fast path).
if (hasSubagentOwner(live.session, live)) return { error: subagentOwnershipError(sessionId) }
return { agent: live }
}
if (live === undefined) return undefined
if (hasSubagentOwner(live.session, live)) return { error: subagentOwnershipError(sessionId) }
return { agent: live }
}
async function agentFor(sessionId: SessionId): Promise<{ agent: Agent } | { error: RpcError }> {
const fenced = fencedLiveAgent(sessionId)
if (fenced !== undefined) return fenced
const attached = ctx.sessions.get(sessionId)
if (attached !== undefined && hasSubagentOwner(attached, undefined)) {
return { error: subagentOwnershipError(sessionId) }
@@ -1119,11 +1126,8 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
// rejection falls through here. Mirror ensureSession's `.catch` in
// full: classify a subagent-owned winner into the stable ownership
// error, and hand a clean plain-agent winner straight back.
const live = ctx.agents.get(sessionId)
if (live !== undefined) {
if (hasSubagentOwner(live.session, live)) return { error: subagentOwnershipError(sessionId) }
return { agent: live }
}
const fenced = fencedLiveAgent(sessionId)
if (fenced !== undefined) return fenced
const attached = ctx.sessions.get(sessionId)
if (attached !== undefined && hasSubagentOwner(attached, undefined)) {
return { error: subagentOwnershipError(sessionId) }