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watcher.ts
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171 lines (146 loc) · 5.94 KB
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import { Cause, Effect, Layer, Scope, ServiceMap } from "effect"
// @ts-ignore
import { createWrapper } from "@parcel/watcher/wrapper"
import type ParcelWatcher from "@parcel/watcher"
import { readdir } from "fs/promises"
import path from "path"
import z from "zod"
import { Bus } from "@/bus"
import { BusEvent } from "@/bus/bus-event"
import { InstanceState } from "@/effect/instance-state"
import { makeRuntime } from "@/effect/run-service"
import { Flag } from "@/flag/flag"
import { Git } from "@/git"
import { Instance } from "@/project/instance"
import { lazy } from "@/util/lazy"
import { Config } from "../config/config"
import { FileIgnore } from "./ignore"
import { Protected } from "./protected"
import { Log } from "../util/log"
declare const OPENCODE_LIBC: string | undefined
export namespace FileWatcher {
const log = Log.create({ service: "file.watcher" })
const SUBSCRIBE_TIMEOUT_MS = 10_000
export const Event = {
Updated: BusEvent.define(
"file.watcher.updated",
z.object({
file: z.string(),
event: z.union([z.literal("add"), z.literal("change"), z.literal("unlink")]),
}),
),
}
const watcher = lazy((): typeof import("@parcel/watcher") | undefined => {
try {
const binding = require(
`@parcel/watcher-${process.platform}-${process.arch}${process.platform === "linux" ? `-${OPENCODE_LIBC || "glibc"}` : ""}`,
)
return createWrapper(binding) as typeof import("@parcel/watcher")
} catch (error) {
log.error("failed to load watcher binding", { error })
return
}
})
function getBackend() {
if (process.platform === "win32") return "windows"
if (process.platform === "darwin") return "fs-events"
if (process.platform === "linux") return "inotify"
}
function protecteds(dir: string) {
return Protected.paths().filter((item) => {
const rel = path.relative(dir, item)
return rel !== "" && !rel.startsWith("..") && !path.isAbsolute(rel)
})
}
export const hasNativeBinding = () => !!watcher()
export interface Interface {
readonly init: () => Effect.Effect<void>
}
export class Service extends ServiceMap.Service<Service, Interface>()("@opencode/FileWatcher") {}
export const layer = Layer.effect(
Service,
Effect.gen(function* () {
const config = yield* Config.Service
const state = yield* InstanceState.make(
Effect.fn("FileWatcher.state")(
function* () {
if (yield* Flag.OPENCODE_EXPERIMENTAL_DISABLE_FILEWATCHER) return
log.info("init", { directory: Instance.directory })
const backend = getBackend()
if (!backend) {
log.error("watcher backend not supported", { directory: Instance.directory, platform: process.platform })
return
}
const w = watcher()
if (!w) return
log.info("watcher backend", { directory: Instance.directory, platform: process.platform, backend })
const subs: ParcelWatcher.AsyncSubscription[] = []
yield* Effect.addFinalizer(() =>
Effect.promise(() => Promise.allSettled(subs.map((sub) => sub.unsubscribe()))),
)
const cb: ParcelWatcher.SubscribeCallback = Instance.bind((err, evts) => {
if (err) return
for (const evt of evts) {
if (evt.type === "create") Bus.publish(Event.Updated, { file: evt.path, event: "add" })
if (evt.type === "update") Bus.publish(Event.Updated, { file: evt.path, event: "change" })
if (evt.type === "delete") Bus.publish(Event.Updated, { file: evt.path, event: "unlink" })
}
})
const subscribe = (dir: string, ignore: string[]) => {
const pending = w.subscribe(dir, cb, { ignore, backend })
return Effect.gen(function* () {
const sub = yield* Effect.promise(() => pending)
subs.push(sub)
}).pipe(
Effect.timeout(SUBSCRIBE_TIMEOUT_MS),
Effect.catchCause((cause) => {
log.error("failed to subscribe", { dir, cause: Cause.pretty(cause) })
pending.then((s) => s.unsubscribe()).catch(() => {})
return Effect.void
}),
)
}
const cfg = yield* config.get()
const cfgIgnores = cfg.watcher?.ignore ?? []
if (yield* Flag.OPENCODE_EXPERIMENTAL_FILEWATCHER) {
yield* subscribe(Instance.directory, [
...FileIgnore.PATTERNS,
...cfgIgnores,
...protecteds(Instance.directory),
])
}
if (Instance.project.vcs === "git") {
const result = yield* Effect.promise(() =>
Git.run(["rev-parse", "--git-dir"], {
cwd: Instance.project.worktree,
}),
)
const vcsDir =
result.exitCode === 0 ? path.resolve(Instance.project.worktree, result.text().trim()) : undefined
if (vcsDir && !cfgIgnores.includes(".git") && !cfgIgnores.includes(vcsDir)) {
const ignore = (yield* Effect.promise(() => readdir(vcsDir).catch(() => []))).filter(
(entry) => entry !== "HEAD",
)
yield* subscribe(vcsDir, ignore)
}
}
},
Effect.catchCause((cause) => {
log.error("failed to init watcher service", { cause: Cause.pretty(cause) })
return Effect.void
}),
),
)
return Service.of({
init: Effect.fn("FileWatcher.init")(function* () {
yield* InstanceState.get(state)
}),
})
}),
)
export const defaultLayer = layer.pipe(Layer.provide(Config.defaultLayer))
const { runPromise } = makeRuntime(Service, defaultLayer)
export function init() {
return runPromise((svc) => svc.init())
}
}