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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275export * as InstructionState from "./instruction-state.js"
import { eq, inArray, sql } from "drizzle-orm"import { Effect, Option, Schema } from "effect"import type { Database } from "../database/database.js"import type { Bus } from "../bus.js"import { Instructions } from "../instructions/index.js"import { SessionEvent } from "./event.js"import { SessionSchema } from "./schema.js"import { InstructionBlobTable, InstructionStateTable } from "./sql.js"
type DatabaseService = Database.Interface["db"]
export interface Observation extends Instructions.Admission { readonly sessionID: SessionSchema.ID readonly initial: boolean readonly previous: Instructions.Values readonly current: Instructions.Values}
export const observe = Effect.fn("InstructionState.observe")(function* ( db: DatabaseService, instructions: Instructions.List, sessionID: SessionSchema.ID,): Effect.fn.Return<Observation, Instructions.InitializationBlocked> { const [observed, stored] = yield* Effect.all([Instructions.read(instructions), find(db, sessionID)], { concurrency: "unbounded", }) const result = yield* observeAgainst(observed, stored?.current_values) return { sessionID, initial: !stored, previous: stored?.current_values ?? {}, ...result, }})
export const commit = Effect.fn("InstructionState.commit")(function* ( db: DatabaseService, bus: Bus.Interface, instructions: Instructions.List, observation: Observation,) { if (!observation.initial && Object.keys(observation.delta).length === 0) return // The rendered text is frozen into the durable event because re-rendering it // later would require the original Location-scoped instruction sources. const text = observation.initial ? "" : yield* renderUpdateText(db, instructions, observation) yield* bus.publish( SessionEvent.InstructionsUpdated, { sessionID: observation.sessionID, delta: observation.delta, ...(text.length > 0 ? { text } : {}), }, { // Initial sync establishes the baseline; unlike later deltas it is not chronological history. ...(observation.initial ? { metadata: { instructions: { initial: true } } } : {}), commit: () => insertBlobs(db, observation.blobs), }, )})
const renderUpdateText = Effect.fnUntraced(function* ( db: DatabaseService, instructions: Instructions.List, observation: Observation,) { const replaced = Object.entries(observation.previous).filter(([key]) => Object.hasOwn(observation.delta, key)) const blobs = yield* loadBlobs( db, replaced.map(([, hash]) => hash), ) const previous = Object.fromEntries(replaced.map(([key, hash]) => [key, requireBlob(blobs, hash)])) const admitted = new Map( Object.entries(observation.blobs).map(([hash, value]) => [Instructions.Hash.make(hash), value]), ) return Instructions.renderUpdate(instructions, previous, dereferenceDelta(observation.delta, admitted))})
export const prepare = Effect.fn("InstructionState.prepare")(function* ( db: DatabaseService, bus: Bus.Interface, instructions: Instructions.List, sessionID: SessionSchema.ID,) { yield* commit(db, bus, instructions, yield* observe(db, instructions, sessionID))})
export const apply = Effect.fn("InstructionState.apply")(function* ( db: DatabaseService, sessionID: SessionSchema.ID, seq: number, delta: Instructions.Delta,) { const stored = yield* find(db, sessionID) const current = Instructions.applyHashDelta(stored?.current_values ?? {}, delta) if (!stored) { yield* db .insert(InstructionStateTable) .values({ session_id: sessionID, epoch_start: seq, through_seq: seq, initial_values: current, current_values: current, }) .run() .pipe(Effect.orDie) return } yield* db .update(InstructionStateTable) .set({ through_seq: seq, current_values: current }) .where(eq(InstructionStateTable.session_id, sessionID)) .run() .pipe(Effect.orDie)})
export const initialize = Effect.fn("InstructionState.initialize")(function* ( db: DatabaseService, sessionID: SessionSchema.ID, seq: number, values: Instructions.Values,) { yield* db .insert(InstructionStateTable) .values({ session_id: sessionID, epoch_start: seq, through_seq: seq, initial_values: values, current_values: values, }) .onConflictDoNothing() .run() .pipe(Effect.orDie)})
export const advanceEpoch = Effect.fn("InstructionState.advanceEpoch")(function* ( db: DatabaseService, sessionID: SessionSchema.ID, epochStart: number,) { yield* db .update(InstructionStateTable) .set({ epoch_start: epochStart, through_seq: epochStart, initial_values: sql`${InstructionStateTable.current_values}`, }) .where(eq(InstructionStateTable.session_id, sessionID)) .run() .pipe(Effect.orDie)})
export const reset = Effect.fn("InstructionState.reset")(function* (db: DatabaseService, sessionID: SessionSchema.ID) { yield* db .delete(InstructionStateTable) .where(eq(InstructionStateTable.session_id, sessionID)) .run() .pipe(Effect.orDie)})
/** Renders the epoch baseline shown at the start of every model request. */export const initial = Effect.fn("InstructionState.initial")(function* ( db: DatabaseService, sessionID: SessionSchema.ID, instructions: Instructions.List,) { const state = yield* find(db, sessionID) if (!state) return yield* Effect.die(new Error(`Instruction state not found during assembly: ${sessionID}`)) const blobs = yield* loadBlobs(db, Object.values(state.initial_values)) return Instructions.renderInitial(instructions, dereference(state.initial_values, blobs))})
/** The current instruction values, used to seed a fork's baseline. */export const current = Effect.fn("InstructionState.current")(function* ( db: DatabaseService, sessionID: SessionSchema.ID,) { return (yield* find(db, sessionID))?.current_values})
export const preview = Effect.fn("InstructionState.preview")(function* ( db: DatabaseService, sessionID: SessionSchema.ID, instructions: Instructions.List, observed: Instructions.ReadResult,) { const state = yield* find(db, sessionID) const result = yield* observeAgainst(observed, state?.current_values) const observedBlobs = new Map<Instructions.Hash, Schema.Json>( Object.entries(result.blobs).map(([hash, value]) => [Instructions.Hash.make(hash), value]), ) if (!state) { const values = dereference(result.current, observedBlobs) return { initial: Instructions.renderInitial(instructions, values), update: "" } } const stored = yield* loadBlobs(db, [...Object.values(state.initial_values), ...Object.values(state.current_values)]) return { initial: Instructions.renderInitial(instructions, dereference(state.initial_values, stored)), update: Instructions.renderUpdate( instructions, dereference(state.current_values, stored), dereferenceDelta(result.delta, observedBlobs), ), }})
const observeAgainst = Effect.fnUntraced(function* (observed: Instructions.ReadResult, previous?: Instructions.Values) { const admission = yield* Instructions.diff(observed, previous) return { current: Instructions.applyHashDelta(previous ?? {}, admission.delta), ...admission, }})
const find = Effect.fnUntraced(function* (db: DatabaseService, sessionID: SessionSchema.ID) { return yield* db .select() .from(InstructionStateTable) .where(eq(InstructionStateTable.session_id, sessionID)) .get() .pipe(Effect.orDie)})
const insertBlobs = Effect.fnUntraced(function* (db: DatabaseService, blobs: Readonly<Record<string, Schema.Json>>) { const rows = Object.entries(blobs).map(([hash, value]) => ({ hash: Instructions.Hash.make(hash), value })) if (rows.length === 0) return yield* db.insert(InstructionBlobTable).values(rows).onConflictDoNothing().run().pipe(Effect.orDie)})
const loadBlobs = Effect.fnUntraced(function* (db: DatabaseService, values: ReadonlyArray<Instructions.Hash>) { const hashes = [...new Set(values)] const batches = Array.from({ length: Math.ceil(hashes.length / 500) }, (_, index) => hashes.slice(index * 500, (index + 1) * 500), ) const rows = (yield* Effect.forEach( batches, (batch) => db.select().from(InstructionBlobTable).where(inArray(InstructionBlobTable.hash, batch)).all().pipe(Effect.orDie), { concurrency: 4 }, )).flat() const blobs = new Map(rows.map((row) => [row.hash, row.value])) for (const hash of hashes) { if (!blobs.has(hash)) return yield* Effect.die(new Error(`Instruction blob not found: ${hash}`)) } return blobs})
function dereference( values: Instructions.Values, blobs: ReadonlyMap<Instructions.Hash, Schema.Json>,): Readonly<Record<string, Schema.Json>> { return Object.fromEntries(Object.entries(values).map(([key, hash]) => [key, requireBlob(blobs, hash)]))}
function dereferenceDelta( delta: Instructions.Delta, blobs: ReadonlyMap<Instructions.Hash, Schema.Json>,): Readonly<Record<string, Option.Option<Schema.Json>>> { return Object.fromEntries( Object.entries(delta).map(([key, hash]) => [ key, hash === "removed" ? Option.none() : Option.some(requireBlob(blobs, hash)), ]), )}
function requireBlob(blobs: ReadonlyMap<Instructions.Hash, Schema.Json>, hash: Instructions.Hash) { const value = blobs.get(hash) if (value === undefined) throw new Error(`Instruction blob not found: ${hash}`) return value}