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fix(core): harden v2 session context epochs

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This commit is contained in:
Kit Langton 2026-06-04 14:49:05 -04:00
commit 03974ba0e6
33 changed files with 340 additions and 6461 deletions
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12
packages/core/src/system-context.ts
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@ -54,7 +54,7 @@ export const PartSchema = Schema.Struct({
text: Schema.String,
})
export const PartsSchema = Schema.Array(PartSchema)
export const CheckpointSchema = Schema.Record(Schema.String, Schema.String)
export const CheckpointSchema = Schema.Record(Key, Schema.String)
export type Checkpoint = Readonly<Record<string, string>>
@ -111,6 +111,7 @@ export function initialize(snapshot: Snapshot): Initialized {
}
export function refresh(snapshot: Snapshot, previous: Checkpoint): Refreshed {
const keys = new Set(snapshot.entries.map((entry) => entry.key))
return {
changes: [
...snapshot.entries.flatMap((entry) =>
@ -119,18 +120,15 @@ export function refresh(snapshot: Snapshot, previous: Checkpoint): Refreshed {
: [],
),
...Object.keys(previous).flatMap((key) =>
snapshot.entries.some((entry) => entry.key === key)
? []
: [{ key: Key.make(key), text: `System context component removed: ${key}` }],
keys.has(Key.make(key)) ? [] : [{ key: Key.make(key), text: `System context component removed: ${key}` }],
),
],
checkpoint: nextCheckpoint(snapshot, previous),
}
}
export function render(parts: ReadonlyArray<Part>) {
return parts.map((part) => part.text).join("\n\n")
}
export const replacementBlocked = (snapshot: Snapshot, previous: Checkpoint) =>
snapshot.entries.some((entry) => entry._tag === "Unavailable" && getCheckpoint(previous, entry.key) !== undefined)
function nextCheckpoint(snapshot: Snapshot, previous: Checkpoint) {
return Object.fromEntries(