File size: 6,103 Bytes
3e05655 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | export * as SessionContextEpoch from "./context-epoch"
import { eq } from "drizzle-orm"
import { DateTime, Effect, Schema } from "effect"
import type { Database } from "../database/database"
import { EventV2 } from "../event"
import { SystemContext } from "../system-context/index"
import { ContextSnapshotDecodeError } from "./error"
import { SessionEvent } from "./event"
import { SessionHistory } from "./history"
import { SessionInput } from "./input"
import { SessionMessage } from "./message"
import { SessionSchema } from "./schema"
import { SessionContextEpochTable } from "./sql"
type DatabaseService = Database.Interface["db"]
interface Prepared {
readonly baseline: string
readonly baselineSeq: number
}
export function initialize(
db: DatabaseService,
context: Effect.Effect<SystemContext.SystemContext>,
sessionID: SessionSchema.ID,
): Effect.Effect<Prepared | undefined, SystemContext.InitializationBlocked> {
return initializeOnce(db, context, sessionID).pipe(Effect.withSpan("SessionContextEpoch.initialize"))
}
export function prepare(
db: DatabaseService,
events: EventV2.Interface,
context: Effect.Effect<SystemContext.SystemContext>,
sessionID: SessionSchema.ID,
): Effect.Effect<Prepared, SystemContext.InitializationBlocked | ContextSnapshotDecodeError> {
return prepareOnce(db, events, context, sessionID).pipe(Effect.withSpan("SessionContextEpoch.prepare"))
}
const prepareOnce = Effect.fnUntraced(function* (
db: DatabaseService,
events: EventV2.Interface,
context: Effect.Effect<SystemContext.SystemContext>,
sessionID: SessionSchema.ID,
) {
const [value, stored, compaction] = yield* Effect.all(
[context, find(db, sessionID), SessionHistory.latestCompaction(db, sessionID)],
{ concurrency: "unbounded" },
)
if (!stored) {
const generation = yield* SystemContext.initialize(value)
const baselineSeq = yield* insert(db, sessionID, generation)
return { baseline: generation.baseline, baselineSeq }
}
const snapshot = yield* Schema.decodeUnknownEffect(SystemContext.Snapshot)(stored.snapshot).pipe(
Effect.mapError((error) => new ContextSnapshotDecodeError({ sessionID, details: String(error) })),
)
const replacementSeq = compaction !== undefined && compaction.seq > stored.baseline_seq ? compaction.seq : undefined
const result = replacementSeq
? yield* SystemContext.replace(value, snapshot)
: yield* SystemContext.reconcile(value, snapshot)
if (result._tag === "Unchanged" || result._tag === "ReplacementBlocked") {
return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
}
if (result._tag === "ReplacementReady") {
const baselineSeq = replacementSeq ?? (yield* EventV2.latestSequence(db, sessionID))
yield* replace(db, sessionID, baselineSeq, result.generation)
return { baseline: result.generation.baseline, baselineSeq }
}
yield* events.publish(
SessionEvent.ContextUpdated,
{ sessionID, messageID: SessionMessage.ID.create(), timestamp: yield* DateTime.now, text: result.text },
{ commit: () => advance(db, sessionID, result.snapshot).pipe(Effect.orDie) },
)
return { baseline: stored.baseline, baselineSeq: stored.baseline_seq }
})
const initializeOnce = Effect.fnUntraced(function* (
db: DatabaseService,
context: Effect.Effect<SystemContext.SystemContext>,
sessionID: SessionSchema.ID,
) {
if (yield* exists(db, sessionID)) return
const generation = yield* context.pipe(Effect.flatMap(SystemContext.initialize))
const baselineSeq = yield* insert(db, sessionID, generation)
return { baseline: generation.baseline, baselineSeq }
})
const exists = Effect.fn("SessionContextEpoch.exists")(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
return (
(yield* db
.select({ sessionID: SessionContextEpochTable.session_id })
.from(SessionContextEpochTable)
.where(eq(SessionContextEpochTable.session_id, sessionID))
.get()
.pipe(Effect.orDie)) !== undefined
)
})
const find = Effect.fn("SessionContextEpoch.find")(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
return yield* db
.select()
.from(SessionContextEpochTable)
.where(eq(SessionContextEpochTable.session_id, sessionID))
.get()
.pipe(Effect.orDie)
})
export const reset = Effect.fn("SessionContextEpoch.reset")(function* (
db: DatabaseService,
sessionID: SessionSchema.ID,
) {
yield* db
.delete(SessionContextEpochTable)
.where(eq(SessionContextEpochTable.session_id, sessionID))
.run()
.pipe(Effect.orDie)
})
const insert = Effect.fnUntraced(function* (
db: DatabaseService,
sessionID: SessionSchema.ID,
generation: SystemContext.Generation,
) {
const baselineSeq = yield* EventV2.latestSequence(db, sessionID)
yield* db
.insert(SessionContextEpochTable)
.values({
session_id: sessionID,
baseline: generation.baseline,
snapshot: generation.snapshot,
baseline_seq: baselineSeq,
})
.run()
.pipe(Effect.orDie)
return baselineSeq
})
const replace = Effect.fnUntraced(function* (
db: DatabaseService,
sessionID: SessionSchema.ID,
baselineSeq: number,
generation: SystemContext.Generation,
) {
const updated = yield* db
.update(SessionContextEpochTable)
.set({
baseline: generation.baseline,
snapshot: generation.snapshot,
baseline_seq: baselineSeq,
})
.where(eq(SessionContextEpochTable.session_id, sessionID))
.returning({ sessionID: SessionContextEpochTable.session_id })
.get()
.pipe(Effect.orDie)
if (!updated) return yield* Effect.die("Context Epoch not found")
})
const advance = Effect.fnUntraced(function* (
db: DatabaseService,
sessionID: SessionSchema.ID,
snapshot: SystemContext.Snapshot,
) {
const updated = yield* db
.update(SessionContextEpochTable)
.set({ snapshot })
.where(eq(SessionContextEpochTable.session_id, sessionID))
.returning({ sessionID: SessionContextEpochTable.session_id })
.get()
.pipe(Effect.orDie)
if (!updated) return yield* Effect.die("Context Epoch not found")
})
|