refactor: rename shared package to core (#24309)

1 files changed, 0 insertions, 358 deletions

diff --git a/packages/shared/src/util/flock.ts b/packages/shared/src/util/flock.ts
deleted file mode 100644
index 958bd9fd1..000000000
--- a/packages/shared/src/util/flock.ts
+++ /dev/null
@@ -1,358 +0,0 @@
-import path from "path"
-import os from "os"
-import { randomBytes, randomUUID } from "crypto"
-import { mkdir, readFile, rm, stat, utimes, writeFile } from "fs/promises"
-import { Hash } from "./hash"
-import { Effect } from "effect"
-
-export type FlockGlobal = {
-  state: string
-}
-
-export namespace Flock {
-  let global: FlockGlobal | undefined
-
-  export function setGlobal(g: FlockGlobal) {
-    global = g
-  }
-
-  const root = () => {
-    if (!global) throw new Error("Flock global not set")
-    return path.join(global.state, "locks")
-  }
-
-  // Defaults for callers that do not provide timing options.
-  const defaultOpts = {
-    staleMs: 60_000,
-    timeoutMs: 5 * 60_000,
-    baseDelayMs: 100,
-    maxDelayMs: 2_000,
-  }
-
-  export interface WaitEvent {
-    key: string
-    attempt: number
-    delay: number
-    waited: number
-  }
-
-  export type Wait = (input: WaitEvent) => void | Promise<void>
-
-  export interface Options {
-    dir?: string
-    signal?: AbortSignal
-    staleMs?: number
-    timeoutMs?: number
-    baseDelayMs?: number
-    maxDelayMs?: number
-    onWait?: Wait
-  }
-
-  type Opts = {
-    staleMs: number
-    timeoutMs: number
-    baseDelayMs: number
-    maxDelayMs: number
-  }
-
-  type Owned = {
-    acquired: true
-    startHeartbeat: (intervalMs?: number) => void
-    release: () => Promise<void>
-  }
-
-  export interface Lease {
-    release: () => Promise<void>
-    [Symbol.asyncDispose]: () => Promise<void>
-  }
-
-  function code(err: unknown) {
-    if (typeof err !== "object" || err === null || !("code" in err)) return
-    const value = err.code
-    if (typeof value !== "string") return
-    return value
-  }
-
-  function sleep(ms: number, signal?: AbortSignal) {
-    return new Promise<void>((resolve, reject) => {
-      if (signal?.aborted) {
-        reject(signal.reason ?? new Error("Aborted"))
-        return
-      }
-
-      let timer: NodeJS.Timeout | undefined
-
-      const done = () => {
-        signal?.removeEventListener("abort", abort)
-        resolve()
-      }
-
-      const abort = () => {
-        if (timer) {
-          clearTimeout(timer)
-        }
-        signal?.removeEventListener("abort", abort)
-        reject(signal?.reason ?? new Error("Aborted"))
-      }
-
-      signal?.addEventListener("abort", abort, { once: true })
-      timer = setTimeout(done, ms)
-    })
-  }
-
-  function jitter(ms: number) {
-    const j = Math.floor(ms * 0.3)
-    const d = Math.floor(Math.random() * (2 * j + 1)) - j
-    return Math.max(0, ms + d)
-  }
-
-  function mono() {
-    return performance.now()
-  }
-
-  function wall() {
-    return performance.timeOrigin + mono()
-  }
-
-  async function stats(file: string) {
-    try {
-      return await stat(file)
-    } catch (err) {
-      const errCode = code(err)
-      if (errCode === "ENOENT" || errCode === "ENOTDIR") return
-      throw err
-    }
-  }
-
-  async function stale(lockDir: string, heartbeatPath: string, metaPath: string, staleMs: number) {
-    // Stale detection allows automatic recovery after crashed owners.
-    const now = wall()
-    const heartbeat = await stats(heartbeatPath)
-    if (heartbeat) {
-      return now - heartbeat.mtimeMs > staleMs
-    }
-
-    const meta = await stats(metaPath)
-    if (meta) {
-      return now - meta.mtimeMs > staleMs
-    }
-
-    const dir = await stats(lockDir)
-    if (!dir) {
-      return false
-    }
-
-    return now - dir.mtimeMs > staleMs
-  }
-
-  async function tryAcquireLockDir(lockDir: string, opts: Opts): Promise<Owned | { acquired: false }> {
-    const token = randomUUID?.() ?? randomBytes(16).toString("hex")
-    const metaPath = path.join(lockDir, "meta.json")
-    const heartbeatPath = path.join(lockDir, "heartbeat")
-
-    try {
-      await mkdir(lockDir, { mode: 0o700 })
-    } catch (err) {
-      if (code(err) !== "EEXIST") {
-        throw err
-      }
-
-      if (!(await stale(lockDir, heartbeatPath, metaPath, opts.staleMs))) {
-        return { acquired: false }
-      }
-
-      const breakerPath = lockDir + ".breaker"
-      try {
-        await mkdir(breakerPath, { mode: 0o700 })
-      } catch (claimErr) {
-        const errCode = code(claimErr)
-        if (errCode === "EEXIST") {
-          const breaker = await stats(breakerPath)
-          if (breaker && wall() - breaker.mtimeMs > opts.staleMs) {
-            await rm(breakerPath, { recursive: true, force: true }).catch(() => undefined)
-          }
-          return { acquired: false }
-        }
-
-        if (errCode === "ENOENT" || errCode === "ENOTDIR") {
-          return { acquired: false }
-        }
-
-        throw claimErr
-      }
-
-      try {
-        // Breaker ownership ensures only one contender performs stale cleanup.
-        if (!(await stale(lockDir, heartbeatPath, metaPath, opts.staleMs))) {
-          return { acquired: false }
-        }
-
-        await rm(lockDir, { recursive: true, force: true })
-
-        try {
-          await mkdir(lockDir, { mode: 0o700 })
-        } catch (retryErr) {
-          const errCode = code(retryErr)
-          if (errCode === "EEXIST" || errCode === "ENOTEMPTY") {
-            return { acquired: false }
-          }
-          throw retryErr
-        }
-      } finally {
-        await rm(breakerPath, { recursive: true, force: true }).catch(() => undefined)
-      }
-    }
-
-    const meta = {
-      token,
-      pid: process.pid,
-      hostname: os.hostname(),
-      createdAt: new Date().toISOString(),
-    }
-
-    await writeFile(heartbeatPath, "", { flag: "wx" }).catch(async () => {
-      await rm(lockDir, { recursive: true, force: true })
-      throw new Error("Lock acquired but heartbeat already existed (possible compromise).")
-    })
-
-    await writeFile(metaPath, JSON.stringify(meta, null, 2), { flag: "wx" }).catch(async () => {
-      await rm(lockDir, { recursive: true, force: true })
-      throw new Error("Lock acquired but meta.json already existed (possible compromise).")
-    })
-
-    let timer: NodeJS.Timeout | undefined
-
-    const startHeartbeat = (intervalMs = Math.max(100, Math.floor(opts.staleMs / 3))) => {
-      if (timer) return
-      // Heartbeat prevents long critical sections from being evicted as stale.
-      timer = setInterval(() => {
-        const t = new Date()
-        void utimes(heartbeatPath, t, t).catch(() => undefined)
-      }, intervalMs)
-      timer.unref?.()
-    }
-
-    const release = async () => {
-      if (timer) {
-        clearInterval(timer)
-        timer = undefined
-      }
-
-      const current = await readFile(metaPath, "utf8")
-        .then((raw) => {
-          const parsed = JSON.parse(raw)
-          if (!parsed || typeof parsed !== "object") return {}
-          return {
-            token: "token" in parsed && typeof parsed.token === "string" ? parsed.token : undefined,
-          }
-        })
-        .catch((err) => {
-          const errCode = code(err)
-          if (errCode === "ENOENT" || errCode === "ENOTDIR") {
-            throw new Error("Refusing to release: lock is compromised (metadata missing).")
-          }
-          if (err instanceof SyntaxError) {
-            throw new Error("Refusing to release: lock is compromised (metadata invalid).")
-          }
-          throw err
-        })
-      // Token check prevents deleting a lock that was re-acquired by another process.
-      if (current.token !== token) {
-        throw new Error("Refusing to release: lock token mismatch (not the owner).")
-      }
-
-      await rm(lockDir, { recursive: true, force: true })
-    }
-
-    return {
-      acquired: true,
-      startHeartbeat,
-      release,
-    }
-  }
-
-  async function acquireLockDir(
-    lockDir: string,
-    input: { key: string; onWait?: Wait; signal?: AbortSignal },
-    opts: Opts,
-  ) {
-    const stop = mono() + opts.timeoutMs
-    let attempt = 0
-    let waited = 0
-    let delay = opts.baseDelayMs
-
-    while (true) {
-      input.signal?.throwIfAborted()
-
-      const res = await tryAcquireLockDir(lockDir, opts)
-      if (res.acquired) {
-        return res
-      }
-
-      if (mono() > stop) {
-        throw new Error(`Timed out waiting for lock: ${input.key}`)
-      }
-
-      attempt += 1
-      const ms = jitter(delay)
-      await input.onWait?.({
-        key: input.key,
-        attempt,
-        delay: ms,
-        waited,
-      })
-      await sleep(ms, input.signal)
-      waited += ms
-      delay = Math.min(opts.maxDelayMs, Math.floor(delay * 1.7))
-    }
-  }
-
-  export async function acquire(key: string, input: Options = {}): Promise<Lease> {
-    input.signal?.throwIfAborted()
-    const cfg: Opts = {
-      staleMs: input.staleMs ?? defaultOpts.staleMs,
-      timeoutMs: input.timeoutMs ?? defaultOpts.timeoutMs,
-      baseDelayMs: input.baseDelayMs ?? defaultOpts.baseDelayMs,
-      maxDelayMs: input.maxDelayMs ?? defaultOpts.maxDelayMs,
-    }
-    const dir = input.dir ?? root()
-
-    await mkdir(dir, { recursive: true })
-    const lockfile = path.join(dir, Hash.fast(key) + ".lock")
-    const lock = await acquireLockDir(
-      lockfile,
-      {
-        key,
-        onWait: input.onWait,
-        signal: input.signal,
-      },
-      cfg,
-    )
-    lock.startHeartbeat()
-
-    const release = () => lock.release()
-    return {
-      release,
-      [Symbol.asyncDispose]() {
-        return release()
-      },
-    }
-  }
-
-  export async function withLock<T>(key: string, fn: () => Promise<T>, input: Options = {}) {
-    await using _ = await acquire(key, input)
-    input.signal?.throwIfAborted()
-    return await fn()
-  }
-
-  export const effect = Effect.fn("Flock.effect")(function* (key: string, input: Options = {}) {
-    return yield* Effect.acquireRelease(
-      Effect.promise((signal) => Flock.acquire(key, { ...input, signal })).pipe(
-        Effect.withSpan("Flock.acquire", {
-          attributes: { key },
-        }),
-      ),
-      (lock) => Effect.promise(() => lock.release()).pipe(Effect.withSpan("Flock.release")),
-    ).pipe(Effect.asVoid)
-  })
-}