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index.ts
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import z from "zod"
import type { ZodObject } from "zod"
import { EventEmitter } from "events"
import { Database, eq } from "@/storage/db"
import { Bus as ProjectBus } from "@/bus"
import { BusEvent } from "@/bus/bus-event"
import { EventSequenceTable, EventTable } from "./event.sql"
import { EventID } from "./schema"
import { Flag } from "@/flag/flag"
export namespace SyncEvent {
export type Definition = {
type: string
version: number
aggregate: string
schema: z.ZodObject
// This is temporary and only exists for compatibility with bus
// event definitions
properties: z.ZodObject
}
export type Event<Def extends Definition = Definition> = {
id: string
seq: number
aggregateID: string
data: z.infer<Def["schema"]>
}
export type SerializedEvent<Def extends Definition = Definition> = Event<Def> & { type: string }
type ProjectorFunc = (db: Database.TxOrDb, data: unknown) => void
export const registry = new Map<string, Definition>()
let projectors: Map<Definition, ProjectorFunc> | undefined
const versions = new Map<string, number>()
let frozen = false
let convertEvent: (type: string, event: Event["data"]) => Promise<Record<string, unknown>> | Record<string, unknown>
const Bus = new EventEmitter<{ event: [{ def: Definition; event: Event }] }>()
export function reset() {
frozen = false
projectors = undefined
convertEvent = (_, data) => data
}
export function init(input: { projectors: Array<[Definition, ProjectorFunc]>; convertEvent?: typeof convertEvent }) {
projectors = new Map(input.projectors)
// Install all the latest event defs to the bus. We only ever emit
// latest versions from code, and keep around old versions for
// replaying. Replaying does not go through the bus, and it
// simplifies the bus to only use unversioned latest events
for (let [type, version] of versions.entries()) {
let def = registry.get(versionedType(type, version))!
BusEvent.define(def.type, def.properties || def.schema)
}
// Freeze the system so it clearly errors if events are defined
// after `init` which would cause bugs
frozen = true
convertEvent = input.convertEvent || ((_, data) => data)
}
export function versionedType<A extends string>(type: A): A
export function versionedType<A extends string, B extends number>(type: A, version: B): `${A}/${B}`
export function versionedType(type: string, version?: number) {
return version ? `${type}.${version}` : type
}
export function define<
Type extends string,
Agg extends string,
Schema extends ZodObject<Record<Agg, z.ZodType<string>>>,
BusSchema extends ZodObject = Schema,
>(input: { type: Type; version: number; aggregate: Agg; schema: Schema; busSchema?: BusSchema }) {
if (frozen) {
throw new Error("Error defining sync event: sync system has been frozen")
}
const def = {
type: input.type,
version: input.version,
aggregate: input.aggregate,
schema: input.schema,
properties: input.busSchema ? input.busSchema : input.schema,
}
versions.set(def.type, Math.max(def.version, versions.get(def.type) || 0))
registry.set(versionedType(def.type, def.version), def)
return def
}
export function project<Def extends Definition>(
def: Def,
func: (db: Database.TxOrDb, data: Event<Def>["data"]) => void,
): [Definition, ProjectorFunc] {
return [def, func as ProjectorFunc]
}
function process<Def extends Definition>(def: Def, event: Event<Def>, options: { publish: boolean }) {
if (projectors == null) {
throw new Error("No projectors available. Call `SyncEvent.init` to install projectors")
}
const projector = projectors.get(def)
if (!projector) {
throw new Error(`Projector not found for event: ${def.type}`)
}
// idempotent: need to ignore any events already logged
Database.transaction((tx) => {
projector(tx, event.data)
if (Flag.OPENCODE_EXPERIMENTAL_WORKSPACES) {
tx.insert(EventSequenceTable)
.values({
aggregate_id: event.aggregateID,
seq: event.seq,
})
.onConflictDoUpdate({
target: EventSequenceTable.aggregate_id,
set: { seq: event.seq },
})
.run()
tx.insert(EventTable)
.values({
id: event.id,
seq: event.seq,
aggregate_id: event.aggregateID,
type: versionedType(def.type, def.version),
data: event.data as Record<string, unknown>,
})
.run()
}
Database.effect(() => {
Bus.emit("event", {
def,
event,
})
if (options?.publish) {
const result = convertEvent(def.type, event.data)
if (result instanceof Promise) {
result.then((data) => {
ProjectBus.publish({ type: def.type, properties: def.schema }, data)
})
} else {
ProjectBus.publish({ type: def.type, properties: def.schema }, result)
}
}
})
})
}
// TODO:
//
// * Support applying multiple events at one time. One transaction,
// and it validets all the sequence ids
// * when loading events from db, apply zod validation to ensure shape
export function replay(event: SerializedEvent, options?: { republish: boolean }) {
const def = registry.get(event.type)
if (!def) {
throw new Error(`Unknown event type: ${event.type}`)
}
const row = Database.use((db) =>
db
.select({ seq: EventSequenceTable.seq })
.from(EventSequenceTable)
.where(eq(EventSequenceTable.aggregate_id, event.aggregateID))
.get(),
)
const latest = row?.seq ?? -1
if (event.seq <= latest) {
return
}
const expected = latest + 1
if (event.seq !== expected) {
throw new Error(`Sequence mismatch for aggregate "${event.aggregateID}": expected ${expected}, got ${event.seq}`)
}
process(def, event, { publish: !!options?.republish })
}
export function run<Def extends Definition>(def: Def, data: Event<Def>["data"]) {
const agg = (data as Record<string, string>)[def.aggregate]
// This should never happen: we've enforced it via typescript in
// the definition
if (agg == null) {
throw new Error(`SyncEvent.run: "${def.aggregate}" required but not found: ${JSON.stringify(data)}`)
}
if (def.version !== versions.get(def.type)) {
throw new Error(`SyncEvent.run: running old versions of events is not allowed: ${def.type}`)
}
// Note that this is an "immediate" transaction which is critical.
// We need to make sure we can safely read and write with nothing
// else changing the data from under us
Database.transaction(
(tx) => {
const id = EventID.ascending()
const row = tx
.select({ seq: EventSequenceTable.seq })
.from(EventSequenceTable)
.where(eq(EventSequenceTable.aggregate_id, agg))
.get()
const seq = row?.seq != null ? row.seq + 1 : 0
const event = { id, seq, aggregateID: agg, data }
process(def, event, { publish: true })
},
{
behavior: "immediate",
},
)
}
export function remove(aggregateID: string) {
Database.transaction((tx) => {
tx.delete(EventSequenceTable).where(eq(EventSequenceTable.aggregate_id, aggregateID)).run()
tx.delete(EventTable).where(eq(EventTable.aggregate_id, aggregateID)).run()
})
}
export function subscribeAll(handler: (event: { def: Definition; event: Event }) => void) {
Bus.on("event", handler)
return () => Bus.off("event", handler)
}
export function payloads() {
return z
.union(
registry
.entries()
.map(([type, def]) => {
return z
.object({
type: z.literal(type),
aggregate: z.literal(def.aggregate),
data: def.schema,
})
.meta({
ref: "SyncEvent" + "." + def.type,
})
})
.toArray() as any,
)
.meta({
ref: "SyncEvent",
})
}
}