feat(core): add embedded v2 session runtime and tool foundation (#30632)

packages/core/src/session/context.ts

@@ -0,0 +1,47 @@
+import { and, asc, desc, eq, gt, gte, or } from "drizzle-orm"
+import { Effect, Schema } from "effect"
+import { Database } from "../database/database"
+import { MessageDecodeError } from "./error"
+import { SessionMessage } from "./message"
+import { SessionSchema } from "./schema"
+import { SessionMessageTable } from "./sql"
+
+type DatabaseService = Database.Interface["db"]
+
+const decode = Schema.decodeUnknownEffect(SessionMessage.Message)
+
+export const load = Effect.fn("SessionContext.load")(function* (db: DatabaseService, sessionID: SessionSchema.ID) {
+  const compaction = yield* db
+    .select()
+    .from(SessionMessageTable)
+    .where(and(eq(SessionMessageTable.session_id, sessionID), eq(SessionMessageTable.type, "compaction")))
+    .orderBy(desc(SessionMessageTable.seq))
+    .limit(1)
+    .get()
+    .pipe(Effect.orDie)
+  const rows = yield* db
+    .select()
+    .from(SessionMessageTable)
+    .where(
+      and(
+        eq(SessionMessageTable.session_id, sessionID),
+        compaction ? or(gte(SessionMessageTable.seq, compaction.seq)) : undefined,
+      ),
+    )
+    .orderBy(asc(SessionMessageTable.seq))
+    .all()
+    .pipe(Effect.orDie)
+  return yield* Effect.forEach(rows, (row) =>
+    decode({ ...row.data, id: row.id, type: row.type }).pipe(
+      Effect.mapError(
+        () =>
+          new MessageDecodeError({
+            sessionID: SessionSchema.ID.make(row.session_id),
+            messageID: SessionMessage.ID.make(row.id),
+          }),
+      ),
+    ),
+  )
+})
+
+export * as SessionContext from "./context"