Move service state into InstanceState, flatten service facades (#18483)

packages/opencode/src/effect/instance-state.ts

@@ -0,0 +1,47 @@
+import { Effect, ScopedCache, Scope } from "effect"
+import { Instance, type Shape } from "@/project/instance"
+import { registerDisposer } from "./instance-registry"
+
+const TypeId = "~opencode/InstanceState"
+
+export interface InstanceState<A, E = never, R = never> {
+  readonly [TypeId]: typeof TypeId
+  readonly cache: ScopedCache.ScopedCache<string, A, E, R>
+}
+
+export namespace InstanceState {
+  export const make = <A, E = never, R = never>(
+    init: (ctx: Shape) => Effect.Effect<A, E, R | Scope.Scope>,
+  ): Effect.Effect<InstanceState<A, E, Exclude<R, Scope.Scope>>, never, R | Scope.Scope> =>
+    Effect.gen(function* () {
+      const cache = yield* ScopedCache.make<string, A, E, R>({
+        capacity: Number.POSITIVE_INFINITY,
+        lookup: () => init(Instance.current),
+      })
+
+      const off = registerDisposer((directory) => Effect.runPromise(ScopedCache.invalidate(cache, directory)))
+      yield* Effect.addFinalizer(() => Effect.sync(off))
+
+      return {
+        [TypeId]: TypeId,
+        cache,
+      }
+    })
+
+  export const get = <A, E, R>(self: InstanceState<A, E, R>) =>
+    Effect.suspend(() => ScopedCache.get(self.cache, Instance.directory))
+
+  export const use = <A, E, R, B>(self: InstanceState<A, E, R>, select: (value: A) => B) =>
+    Effect.map(get(self), select)
+
+  export const useEffect = <A, E, R, B, E2, R2>(
+    self: InstanceState<A, E, R>,
+    select: (value: A) => Effect.Effect<B, E2, R2>,
+  ) => Effect.flatMap(get(self), select)
+
+  export const has = <A, E, R>(self: InstanceState<A, E, R>) =>
+    Effect.suspend(() => ScopedCache.has(self.cache, Instance.directory))
+
+  export const invalidate = <A, E, R>(self: InstanceState<A, E, R>) =>
+    Effect.suspend(() => ScopedCache.invalidate(self.cache, Instance.directory))
+}