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fix(core): finalize v2 session context epochs

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This commit is contained in:
Kit Langton 2026-06-04 21:17:05 -04:00
commit cd812e2045
33 changed files with 1245 additions and 791 deletions
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23
packages/core/src/system-context.ts
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@ -67,8 +67,8 @@ export interface Updated {
readonly snapshot: Snapshot
}
export interface Replaced {
readonly _tag: "Replaced"
export interface ReplacementReady {
readonly _tag: "ReplacementReady"
readonly generation: Generation
}
@ -76,9 +76,14 @@ export interface ReplacementBlocked {
readonly _tag: "ReplacementBlocked"
}
export type ReplacementResult = Replaced | ReplacementBlocked
export type ReplacementResult = ReplacementReady | ReplacementBlocked
export type ReconcileResult = { readonly _tag: "Unchanged" } | Updated | ReplacementResult
export class InitializationBlocked extends Schema.TaggedErrorClass<InitializationBlocked>()(
"SystemContext.InitializationBlocked",
{ keys: Schema.Array(Key) },
) {}
export class DuplicateKeyError extends Schema.TaggedErrorClass<DuplicateKeyError>()("SystemContext.DuplicateKeyError", {
key: Key,
}) {
@ -186,8 +191,14 @@ const observe = (value: SystemContext) =>
)
/** Creates the immutable baseline and durable snapshot for a new generation. */
export function initialize(value: SystemContext): Effect.Effect<Generation> {
return observe(value).pipe(Effect.map(initializeObservation))
export function initialize(value: SystemContext): Effect.Effect<Generation, InitializationBlocked> {
return observe(value).pipe(
Effect.flatMap((entries) => {
const unavailable = entries.flatMap((entry) => (entry._tag === "Unavailable" ? [entry.key] : []))
if (unavailable.length > 0) return new InitializationBlocked({ keys: unavailable })
return Effect.succeed(initializeObservation(entries))
}),
)
}
function initializeObservation(entries: ReadonlyArray<Entry>): Generation {
@ -272,7 +283,7 @@ export function replace(value: SystemContext, previous: Snapshot): Effect.Effect
function replaceObservation(entries: ReadonlyArray<Entry>, previous: Snapshot): ReplacementResult {
if (entries.some((entry) => entry._tag === "Unavailable" && getSnapshot(previous, entry.key) !== undefined))
return { _tag: "ReplacementBlocked" }
return { _tag: "Replaced", generation: initializeObservation(entries) }
return { _tag: "ReplacementReady", generation: initializeObservation(entries) }
}
function context(sources: ReadonlyArray<PackedSource>): SystemContext {