633 lines
24 KiB
TypeScript
633 lines
24 KiB
TypeScript
export * as EventV2 from "./event"
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import { Cause, Context, Effect, Layer, Option, PubSub, Schema, Stream } from "effect"
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import { and, asc, eq, gt } from "drizzle-orm"
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import { Database } from "./database/database"
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import { EventSequenceTable, EventTable } from "./event/sql"
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import { Location } from "./location"
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import { externalID, type ExternalID, withStatics } from "./schema"
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import { Identifier } from "./util/identifier"
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import { LayerNode } from "./effect/layer-node"
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import { isDeepStrictEqual } from "node:util"
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export const ID = Schema.String.check(Schema.isStartsWith("evt_")).pipe(
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Schema.brand("Event.ID"),
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withStatics((schema) => ({
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create: () => schema.make("evt_" + Identifier.ascending()),
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fromExternal: (input: ExternalID) => schema.make(externalID("evt", input)),
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})),
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)
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export type ID = typeof ID.Type
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export type Definition<Type extends string = string, DataSchema extends Schema.Top = Schema.Top> = {
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readonly type: Type
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readonly durable?: {
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readonly version: number
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readonly aggregate: string
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}
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readonly data: DataSchema
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}
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export type Data<D extends Definition> = Schema.Schema.Type<D["data"]>
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export type Payload<D extends Definition = Definition> = {
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readonly id: ID
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readonly type: D["type"]
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readonly data: Data<D>
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readonly durable?: {
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readonly aggregateID: string
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readonly seq: number
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readonly version: number
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}
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readonly location?: Location.Ref
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readonly metadata?: Record<string, unknown>
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}
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export type Subscriber<D extends Definition = Definition> = (event: Payload<D>) => Effect.Effect<void>
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export type Unsubscribe = Effect.Effect<void>
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export type SerializedEvent = {
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readonly id: ID
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readonly type: string
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readonly seq: number
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readonly aggregateID: string
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readonly data: Record<string, unknown>
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}
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export class InvalidDurableEventError extends Schema.TaggedErrorClass<InvalidDurableEventError>()(
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"EventV2.InvalidDurableEvent",
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{
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type: Schema.String,
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message: Schema.String,
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},
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) {}
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export function versionedType(type: string, version: number) {
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return `${type}.${version}`
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}
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export const registry = new Map<string, Definition>()
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const durableRegistry = new Map<string, Definition>()
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export function define<const Type extends string, Fields extends Schema.Struct.Fields>(input: {
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readonly type: Type
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readonly durable?: {
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readonly version: number
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readonly aggregate: string
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}
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readonly schema: Fields
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}): Schema.Schema<Payload<Definition<Type, Schema.Struct<Fields>>>> & Definition<Type, Schema.Struct<Fields>> {
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const Data = Schema.Struct(input.schema)
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const Payload = Schema.Struct({
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id: ID,
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metadata: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),
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type: Schema.Literal(input.type),
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durable: Schema.optional(Schema.Struct({ aggregateID: Schema.String, seq: Schema.Number, version: Schema.Number })),
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location: Schema.optional(Location.Ref),
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data: Data,
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}).annotate({ identifier: input.type })
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const definition = Object.assign(Payload, {
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type: input.type,
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...(input.durable === undefined ? {} : { durable: input.durable }),
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data: Data,
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})
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const existing = registry.get(input.type)
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if (
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input.durable === undefined ||
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existing?.durable === undefined ||
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input.durable.version >= existing.durable.version
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) {
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registry.set(input.type, definition)
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}
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if (input.durable) durableRegistry.set(versionedType(input.type, input.durable.version), definition)
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return definition as Schema.Schema<Payload<Definition<Type, Schema.Struct<Fields>>>> &
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Definition<Type, Schema.Struct<Fields>>
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}
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export function definitions() {
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return registry.values().toArray()
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}
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export interface PublishOptions {
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readonly id?: ID
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readonly metadata?: Record<string, unknown>
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readonly location?: Location.Ref
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/** Local operational projection committed atomically with a new durable event. Not replayed or serialized. */
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readonly commit?: (seq: number) => Effect.Effect<void>
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}
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export interface Interface {
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readonly publish: <D extends Definition>(
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definition: D,
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data: Data<D>,
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options?: PublishOptions,
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) => Effect.Effect<Payload<D>>
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readonly subscribe: <D extends Definition>(definition: D) => Stream.Stream<Payload<D>>
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readonly all: () => Stream.Stream<Payload>
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readonly durable: (input: { readonly aggregateID: string; readonly after?: number }) => Stream.Stream<Payload>
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/** @deprecated Use `all()` and consume the returned stream. */
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readonly listen: (listener: Subscriber) => Effect.Effect<Unsubscribe>
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readonly project: <D extends Definition>(definition: D, projector: Subscriber<D>) => Effect.Effect<void>
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readonly replay: (
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event: SerializedEvent,
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options?: { readonly publish?: boolean; readonly ownerID?: string; readonly strictOwner?: boolean },
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) => Effect.Effect<void>
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readonly replayAll: (
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events: SerializedEvent[],
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options?: { readonly publish?: boolean; readonly ownerID?: string; readonly strictOwner?: boolean },
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) => Effect.Effect<string | undefined>
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readonly remove: (aggregateID: string) => Effect.Effect<void>
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readonly claim: (aggregateID: string, ownerID: string) => Effect.Effect<void>
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}
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export class Service extends Context.Service<Service, Interface>()("@opencode/Event") {}
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export interface LayerOptions {
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readonly beforeAggregateRead?: (aggregateID: string) => Effect.Effect<void>
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}
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export const layerWith = (options?: LayerOptions) =>
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Layer.effect(
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Service,
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Effect.gen(function* () {
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const pubsub = {
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all: yield* PubSub.unbounded<Payload>(),
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durable: new Map<string, Set<PubSub.PubSub<void>>>(),
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typed: new Map<string, PubSub.PubSub<Payload>>(),
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}
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const projectors = new Map<string, Subscriber[]>()
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const listeners = new Array<Subscriber>()
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const { db } = yield* Database.Service
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const getOrCreate = (definition: Definition) =>
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Effect.gen(function* () {
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const existing = pubsub.typed.get(definition.type)
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if (existing) return existing
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const created = yield* PubSub.unbounded<Payload>()
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pubsub.typed.set(definition.type, created)
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return created
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})
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yield* Effect.addFinalizer(() =>
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Effect.gen(function* () {
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yield* PubSub.shutdown(pubsub.all)
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yield* Effect.forEach(
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pubsub.durable.values(),
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(pubsubs) => Effect.forEach(pubsubs, PubSub.shutdown, { discard: true }),
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{ discard: true },
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)
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yield* Effect.forEach(pubsub.typed.values(), PubSub.shutdown, { discard: true })
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}),
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)
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function commitDurableEvent(
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event: Payload,
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input?: {
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readonly seq: number
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readonly aggregateID: string
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readonly ownerID?: string
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readonly strictOwner?: boolean
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},
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commit?: (seq: number) => Effect.Effect<void>,
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) {
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return Effect.gen(function* () {
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const definition = registry.get(event.type)
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const durable = definition?.durable
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if (durable) {
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const aggregateID = (event.data as Record<string, unknown>)[durable.aggregate]
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if (typeof aggregateID !== "string") {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Expected string aggregate field ${durable.aggregate}`,
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}),
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)
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} else {
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if (input && input.aggregateID !== aggregateID) {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Aggregate mismatch: expected ${input.aggregateID}, got ${aggregateID}`,
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}),
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)
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}
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const list = projectors.get(event.type) ?? []
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return yield* Effect.uninterruptible(
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Effect.gen(function* () {
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const committed = yield* db
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.transaction(
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() =>
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Effect.gen(function* () {
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const row = yield* db
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.select({ seq: EventSequenceTable.seq, ownerID: EventSequenceTable.owner_id })
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.from(EventSequenceTable)
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.where(eq(EventSequenceTable.aggregate_id, aggregateID))
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.get()
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.pipe(Effect.orDie)
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const latest = row?.seq ?? -1
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const encoded = Schema.encodeUnknownSync(
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definition.data as Schema.Codec<unknown, unknown, never, never>,
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)(event.data) as Record<string, unknown>
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if (input?.strictOwner && row?.ownerID && row.ownerID !== input.ownerID) {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Replay owner mismatch for aggregate ${aggregateID}: expected ${row.ownerID}, got ${input.ownerID ?? "none"}`,
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}),
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)
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}
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if (input && input.seq <= latest) {
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const stored = yield* db
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.select()
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.from(EventTable)
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.where(and(eq(EventTable.aggregate_id, aggregateID), eq(EventTable.seq, input.seq)))
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.get()
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.pipe(Effect.orDie)
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if (
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stored?.id === event.id &&
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stored.type === versionedType(definition.type, durable.version) &&
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isDeepStrictEqual(stored.data, encoded)
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) {
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if (input.ownerID && row?.ownerID == null) {
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yield* db
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.update(EventSequenceTable)
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.set({ owner_id: input.ownerID })
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.where(eq(EventSequenceTable.aggregate_id, aggregateID))
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.run()
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.pipe(Effect.orDie)
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}
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return
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}
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Replay diverged at aggregate ${aggregateID} sequence ${input.seq}`,
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}),
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)
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}
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if (input && row?.ownerID && row.ownerID !== input.ownerID) {
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return
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}
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const seq = input?.seq ?? latest + 1
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if (input && seq !== latest + 1) {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Sequence mismatch for aggregate ${aggregateID}: expected ${latest + 1}, got ${seq}`,
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}),
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)
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}
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const stored = yield* db
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.select({ aggregateID: EventTable.aggregate_id, seq: EventTable.seq })
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.from(EventTable)
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.where(eq(EventTable.id, event.id))
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.get()
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.pipe(Effect.orDie)
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if (stored)
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Event ${event.id} already exists at aggregate ${stored.aggregateID} sequence ${stored.seq}`,
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}),
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)
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const committed = {
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...event,
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durable: { aggregateID, seq, version: durable.version },
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} as Payload
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for (const projector of list) {
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yield* projector(committed)
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}
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if (commit) yield* commit(seq)
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yield* db
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.insert(EventSequenceTable)
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.values([{ aggregate_id: aggregateID, seq, owner_id: input?.ownerID }])
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.onConflictDoUpdate({
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target: EventSequenceTable.aggregate_id,
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set: {
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seq,
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...(input?.ownerID && row?.ownerID == null ? { owner_id: input.ownerID } : {}),
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},
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})
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.run()
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.pipe(Effect.orDie)
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yield* db
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.insert(EventTable)
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.values([
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{
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id: event.id,
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aggregate_id: aggregateID,
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seq,
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type: versionedType(definition.type, durable.version),
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data: encoded,
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},
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])
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.run()
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.pipe(Effect.orDie)
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return { aggregateID, seq }
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}),
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{ behavior: "immediate" },
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)
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.pipe(Effect.orDie)
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if (committed) {
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yield* Effect.forEach(
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pubsub.durable.get(committed.aggregateID) ?? [],
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(wake) => PubSub.publish(wake, undefined),
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{ discard: true },
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)
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}
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return committed
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}),
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)
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}
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}
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})
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}
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function publishEvent<D extends Definition>(event: Payload<D>, commit?: PublishOptions["commit"]) {
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return Effect.gen(function* () {
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const definition = registry.get(event.type)
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if (!definition?.durable && commit)
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return yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: "Local commit hooks require a durable event",
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}),
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)
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if (definition?.durable) {
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const committed = yield* commitDurableEvent(event as Payload, undefined, commit)
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if (committed) {
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event = {
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...event,
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durable: {
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aggregateID: committed.aggregateID,
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seq: committed.seq,
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version: definition.durable.version,
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},
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}
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yield* notify(event as Payload, true)
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return event
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}
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}
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yield* notify(event as Payload, false)
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return event
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})
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}
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const observe = (event: Payload, observer: (event: Payload) => Effect.Effect<void>) =>
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Effect.suspend(() => observer(event)).pipe(
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Effect.catchCauseIf(
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(cause) => !Cause.hasInterrupts(cause),
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(cause) => Effect.logError("Event listener failed", { eventID: event.id, eventType: event.type, cause }),
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),
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)
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function notify(event: Payload, isolateListeners: boolean) {
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return Effect.gen(function* () {
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yield* Effect.forEach(
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listeners,
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(listener) => (isolateListeners ? observe(event, listener) : listener(event)),
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{ discard: true },
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)
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const typed = pubsub.typed.get(event.type)
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if (typed) yield* PubSub.publish(typed, event)
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yield* PubSub.publish(pubsub.all, event)
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})
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}
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function publish<D extends Definition>(definition: D, data: Data<D>, options?: PublishOptions) {
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return Effect.gen(function* () {
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const serviceLocation = Option.getOrUndefined(yield* Effect.serviceOption(Location.Service))
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const location =
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options?.location ??
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(serviceLocation
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? { directory: serviceLocation.directory, workspaceID: serviceLocation.workspaceID }
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: undefined)
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return yield* publishEvent(
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{
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id: options?.id ?? ID.create(),
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...(options?.metadata ? { metadata: options.metadata } : {}),
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type: definition.type,
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...(location ? { location } : {}),
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data,
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} as Payload<D>,
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options?.commit,
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)
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})
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}
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function replay(
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event: SerializedEvent,
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options?: { readonly publish?: boolean; readonly ownerID?: string; readonly strictOwner?: boolean },
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) {
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return Effect.gen(function* () {
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const definition = durableRegistry.get(event.type)
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if (!definition?.durable) {
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yield* Effect.die(
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new InvalidDurableEventError({ type: event.type, message: `Unknown durable event type ${event.type}` }),
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)
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} else {
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const payload = {
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id: event.id,
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type: definition.type,
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data: Schema.decodeUnknownSync(definition.data as Schema.Codec<unknown, unknown, never, never>)(
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event.data,
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),
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} as Payload
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const committed = yield* commitDurableEvent(payload, {
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seq: event.seq,
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aggregateID: event.aggregateID,
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ownerID: options?.ownerID,
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strictOwner: options?.strictOwner,
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})
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if (committed && options?.publish) {
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yield* notify(
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{
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...payload,
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durable: {
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aggregateID: committed.aggregateID,
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seq: committed.seq,
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version: definition.durable.version,
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},
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},
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true,
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)
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}
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}
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})
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}
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|
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function replayAll(
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events: SerializedEvent[],
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options?: { readonly publish?: boolean; readonly ownerID?: string; readonly strictOwner?: boolean },
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) {
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return Effect.gen(function* () {
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const source = events[0]?.aggregateID
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if (!source) return undefined
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if (events.some((event) => event.aggregateID !== source)) {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: events[0]?.type ?? "unknown",
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message: "Replay events must belong to the same aggregate",
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}),
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)
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}
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const start = events[0]?.seq ?? 0
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for (const [index, event] of events.entries()) {
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const seq = start + index
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if (event.seq !== seq) {
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yield* Effect.die(
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new InvalidDurableEventError({
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type: event.type,
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message: `Replay sequence mismatch at index ${index}: expected ${seq}, got ${event.seq}`,
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}),
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)
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}
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}
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for (const event of events) {
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yield* replay(event, options)
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}
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return source
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})
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}
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function remove(aggregateID: string) {
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return db
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.transaction(() =>
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Effect.gen(function* () {
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yield* db.delete(EventSequenceTable).where(eq(EventSequenceTable.aggregate_id, aggregateID)).run()
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yield* db.delete(EventTable).where(eq(EventTable.aggregate_id, aggregateID)).run()
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}),
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)
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.pipe(Effect.orDie)
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}
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function claim(aggregateID: string, ownerID: string) {
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return db
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.update(EventSequenceTable)
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.set({ owner_id: ownerID })
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.where(eq(EventSequenceTable.aggregate_id, aggregateID))
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.run()
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.pipe(Effect.orDie)
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}
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const subscribe = <D extends Definition>(definition: D): Stream.Stream<Payload<D>> =>
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Stream.unwrap(getOrCreate(definition).pipe(Effect.map((pubsub) => Stream.fromPubSub(pubsub)))).pipe(
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Stream.map((event) => event as Payload<D>),
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)
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const streamAll = (): Stream.Stream<Payload> => Stream.fromPubSub(pubsub.all)
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const decodeSerializedEvent = (event: SerializedEvent): Payload => {
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const definition = durableRegistry.get(event.type)
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if (!definition?.durable) {
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throw new InvalidDurableEventError({ type: event.type, message: `Unknown durable event type ${event.type}` })
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}
|
|
return {
|
|
id: event.id,
|
|
type: definition.type,
|
|
durable: { aggregateID: event.aggregateID, seq: event.seq, version: definition.durable.version },
|
|
data: Schema.decodeUnknownSync(definition.data as Schema.Codec<unknown, unknown, never, never>)(event.data),
|
|
}
|
|
}
|
|
|
|
const readAfter = (aggregateID: string, after: number) =>
|
|
(options?.beforeAggregateRead?.(aggregateID) ?? Effect.void).pipe(
|
|
Effect.andThen(
|
|
db
|
|
.select()
|
|
.from(EventTable)
|
|
.where(and(eq(EventTable.aggregate_id, aggregateID), gt(EventTable.seq, after)))
|
|
.orderBy(asc(EventTable.seq))
|
|
.all(),
|
|
),
|
|
Effect.orDie,
|
|
Effect.map((rows) =>
|
|
rows.map((event) =>
|
|
decodeSerializedEvent({
|
|
id: event.id,
|
|
aggregateID: event.aggregate_id,
|
|
seq: event.seq,
|
|
type: event.type,
|
|
data: event.data,
|
|
}),
|
|
),
|
|
),
|
|
)
|
|
|
|
const subscribeDurable = (aggregateID: string) =>
|
|
Effect.gen(function* () {
|
|
const wake = yield* PubSub.sliding<void>(1)
|
|
const subscription = yield* PubSub.subscribe(wake)
|
|
yield* Effect.acquireRelease(
|
|
Effect.sync(() => {
|
|
const wakes = pubsub.durable.get(aggregateID) ?? new Set()
|
|
wakes.add(wake)
|
|
pubsub.durable.set(aggregateID, wakes)
|
|
}),
|
|
() =>
|
|
Effect.sync(() => {
|
|
const wakes = pubsub.durable.get(aggregateID)
|
|
wakes?.delete(wake)
|
|
if (wakes?.size === 0) pubsub.durable.delete(aggregateID)
|
|
}).pipe(Effect.andThen(PubSub.shutdown(wake))),
|
|
)
|
|
return subscription
|
|
})
|
|
|
|
const durable = (input: { readonly aggregateID: string; readonly after?: number }): Stream.Stream<Payload> =>
|
|
Stream.unwrap(
|
|
Effect.gen(function* () {
|
|
const wakes = yield* subscribeDurable(input.aggregateID)
|
|
let sequence = input.after ?? -1
|
|
const read = Effect.suspend(() => readAfter(input.aggregateID, sequence)).pipe(
|
|
Effect.tap((events) =>
|
|
Effect.sync(() => {
|
|
sequence = events.at(-1)?.durable?.seq ?? sequence
|
|
}),
|
|
),
|
|
)
|
|
const historical = yield* read
|
|
const live = Stream.fromSubscription(wakes).pipe(
|
|
Stream.mapEffect(() => read),
|
|
Stream.flattenIterable,
|
|
)
|
|
return Stream.concat(Stream.fromIterable(historical), live)
|
|
}),
|
|
)
|
|
|
|
const listen = (listener: Subscriber): Effect.Effect<Unsubscribe> =>
|
|
Effect.sync(() => {
|
|
listeners.push(listener)
|
|
return Effect.sync(() => {
|
|
const index = listeners.indexOf(listener)
|
|
if (index >= 0) listeners.splice(index, 1)
|
|
})
|
|
})
|
|
|
|
const project = <D extends Definition>(definition: D, projector: Subscriber<D>): Effect.Effect<void> =>
|
|
Effect.sync(() => {
|
|
const list = projectors.get(definition.type) ?? []
|
|
list.push((event) => projector(event as Payload<D>))
|
|
projectors.set(definition.type, list)
|
|
})
|
|
|
|
return Service.of({
|
|
publish,
|
|
subscribe,
|
|
all: streamAll,
|
|
durable,
|
|
listen,
|
|
project,
|
|
replay,
|
|
replayAll,
|
|
remove,
|
|
claim,
|
|
})
|
|
}),
|
|
)
|
|
|
|
export const layer = layerWith()
|
|
export const node = LayerNode.make(layer, [Database.node])
|
|
|
|
export const defaultLayer = layer.pipe(Layer.provide(Database.defaultLayer))
|