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session: cache the derived history — one projection per node, frozen and shared

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deriveMessages() no longer re-derives and re-clones the whole surface
per call: each node is projected exactly once, when first seen (O(new
nodes) per access), through the now-public deriveEventMessage — the
per-node pure function external reconstructors and the dev invariant
fold over a log prefix, so no two paths can disagree about a request's
messages. A surface rewrite (replace, invalidate) rebuilds, signalled
by SurfaceManager.replaceGeneration — monotonic, bumped by every folded
replace and by invalidate(), never reset. Callers get a fresh array
snapshot per call over SHARED deep-frozen messages: isolation of the
append-only log moves from per-call cloning to unrepresentability
(mutation throws), which the two isolation tests now pin directly.
This commit is contained in:
Tianyi Cui
2026-07-06 02:51:20 +08:00
parent a7b569850b
commit a4f7e757fa
10 changed files with 208 additions and 49 deletions
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6
docs/cordis-catalog/events.md
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@@ -209,7 +209,7 @@ A session was created in the store.
'session/created'(session: Session): void
```
Source: [`packages/core/session/src/index.ts:37`](../../packages/core/session/src/index.ts)
Source: [`packages/core/session/src/index.ts:38`](../../packages/core/session/src/index.ts)
### `session/event` — emit
@@ -221,7 +221,7 @@ An event was appended to a session log (sync, fire-and-forget). This is the per-
Types: [SessionEvent](../core-data-structures/core.md)
Source: [`packages/core/session/src/index.ts:45`](../../packages/core/session/src/index.ts)
Source: [`packages/core/session/src/index.ts:46`](../../packages/core/session/src/index.ts)
### `session/flush` — parallel
@@ -231,7 +231,7 @@ Awaited durability checkpoint. The agent loop awaits `ctx.parallel('session/flus
'session/flush'(session: Session): Promise<void> | void
```
Source: [`packages/core/session/src/index.ts:55`](../../packages/core/session/src/index.ts)
Source: [`packages/core/session/src/index.ts:56`](../../packages/core/session/src/index.ts)
## `subagent/*`

2
docs/cordis-catalog/services.md
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@@ -163,7 +163,7 @@ get(id: SessionId): Session | undefined
list(): Session[]
```
Source: [`packages/core/session/src/index.ts:328`](../../packages/core/session/src/index.ts)
Source: [`packages/core/session/src/index.ts:345`](../../packages/core/session/src/index.ts)
## `ctx.subagents` — `SubagentService`