feat(workspace): offer to install the engine a bound workspace needs

packages/opencode/src/altimate/workspace/engine-offer.ts

@@ -0,0 +1,287 @@
+// altimate_change - new file
+//
+// The install offer for a workspace whose engine is missing or too old.
+//
+// State-free on purpose: the TUI plugin runs in its own module realm and
+// receives the offer as a bare command over the event bus, so it re-derives
+// the detail here from disk and PATH rather than from the overlay's memory.
+// Offer, never install on the flow's own account — `installEngine` only ever
+// runs from an explicit "Install now".
+import { execFile, type ChildProcess } from "node:child_process"
+import launch from "cross-spawn"
+import { Process } from "@/util/process"
+import { AppRuntime } from "@/effect/app-runtime"
+import { EventV2Bridge } from "@/event-v2-bridge"
+import { TuiEvent } from "@/server/tui-event"
+import { readLocalBinding } from "./state"
+import { isHeadless, log, syncInternals } from "./engine-seams"
+import { declaredBounded, notify, printLine, versionOf, which } from "./engine-probes"
+import { ENGINE_BINARY, ENGINE_PACKAGE, MIN_ENGINE_VERSION, clearsFloor, type Toast } from "./engine-types"
+
+/** Node major the npm install path needs. The CLI itself is a self-contained
+ * binary and does not need Node — only this install route does. */
+export const MIN_NODE_MAJOR = 20
+/** How long "Install now" waits for npm before giving up. */
+export const INSTALL_TIMEOUT_MS = 300_000
+/** Command the TUI plugin registers to raise the install offer. The offer
+ * crosses to the TUI over the same event bus toasts use; it cannot cross
+ * in-process, because the plugin runtime loads plugins in a separate realm.
+ * `CommandExecute` carries no payload, so the plugin re-derives the offer
+ * with `describeOffer()`. */
+export const OFFER_COMMAND = "altimate.workspace.engineInstallOffer"
+/** How long "Not now" silences the offer for a workspace. The TUI latch and
+ * the per-session announce dedupe both key on this, so a session that
+ * outlives the latch sees the offer again instead of waiting for a new one. */
+export const OFFER_SKIP_TTL_MS = 7 * 24 * 60 * 60 * 1000
+/** Once a session's offer is older than the latch, how often it is raised
+ * again while the verdict stands. The TUI's latch starts when "Not now" is
+ * chosen, not when the offer was raised, so the attach side cannot know when
+ * it ends: it re-raises at this cadence and the TUI suppresses until then. */
+export const OFFER_RECHECK_MS = 60 * 60 * 1000
+
+/** A "no usable engine" state, described well enough for an interactive
+ * surface to act on it without re-deriving anything. */
+export type EngineOffer = {
+  reason: "engine-missing" | "engine-too-old"
+  /** Stable id — the 7-day "Not now" latch keys on this, not the name. */
+  workspaceId: string
+  workspaceName: string
+  /** Declared, CLI-servable integration tools that are unavailable without it. */
+  declared: number
+  /** Version found — only set for "engine-too-old". */
+  found?: string
+  /** The exact install/update command. */
+  command: string
+}
+
+/** Interactive surface for the offer, in the same realm. Returns true when it
+ * took ownership. Deliberately synchronous: it claims the offer and renders
+ * out-of-band rather than making the turn boundary wait for a person. */
+export type OfferHandler = (offer: EngineOffer) => boolean
+
+export type InstallResult = { ok: true } | { ok: false; error: string }
+
+/** npm spec to install. ALTIMATE_ENGINE_INSTALL_SPEC overrides it so E2E can
+ * point the real install path at a local tarball instead of the registry. */
+export function installSpec(): string {
+  return process.env["ALTIMATE_ENGINE_INSTALL_SPEC"] || `${ENGINE_PACKAGE}@${MIN_ENGINE_VERSION}`
+}
+
+/** The command shown, copied, printed, and run — always the same string, so
+ * "Copy command" hands over exactly what "Install now" would have executed. */
+export function installCommand(): string {
+  return `npm i -g ${installSpec()}`
+}
+
+/** Re-derive the current "no usable engine" state for a directory, from the
+ * binding on disk and the engine on PATH. Null when there is nothing to offer:
+ * unbound, or an engine that clears the floor. */
+export async function describeOffer(directory: string): Promise<EngineOffer | null> {
+  const binding = syncInternals.resolveBinding
+    ? await syncInternals.resolveBinding(directory)
+    : await readLocalBinding(directory).catch(() => null)
+  if (!binding) return null
+  const workspaceId = String(binding.datamateId)
+  const bin = which(ENGINE_BINARY)
+  const found = bin ? await versionOf(bin) : null
+  if (bin && clearsFloor(found)) return null
+  const declared = (await declaredBounded(workspaceId))?.keys.length ?? 0
+  return {
+    reason: bin ? "engine-too-old" : "engine-missing",
+    workspaceId,
+    workspaceName: binding.datamateName,
+    declared,
+    ...(bin ? { found: found ?? "unknown" } : {}),
+    command: installCommand(),
+  }
+}
+
+/** Node major on PATH, or null when Node is absent. Gates "Install now": with
+ * no Node there is nothing to run npm with, so the offer shows the command. */
+export function nodeMajor(): Promise<number | null> {
+  if (syncInternals.nodeMajor) return syncInternals.nodeMajor()
+  const bin = which("node")
+  if (!bin) return Promise.resolve(null)
+  return new Promise((resolve) => {
+    execFile(bin, ["--version"], { timeout: 5000 }, (err, stdout) => {
+      if (err) return resolve(null)
+      const major = Number.parseInt(stdout.trim().replace(/^v/, "").split(".")[0] ?? "", 10)
+      resolve(Number.isFinite(major) ? major : null)
+    })
+  })
+}
+
+/** Whether npm can be invoked at all. Node and npm are separate packages on
+ * several Linux distributions, so Node 20+ does not imply `npm i -g` runs. */
+export function npmAvailable(): boolean {
+  if (syncInternals.npmAvailable) return syncInternals.npmAvailable()
+  return which(process.platform === "win32" ? "npm.cmd" : "npm") !== null
+}
+
+/** Options are the process-group and deadline handling for the one command
+ * the offer runs. Nothing here spawns a shell. */
+export type InstallRun = { code: number | null; timedOut: boolean; stderr: string }
+/** After the deadline's SIGTERM, how long the tree gets before SIGKILL and the
+ * run is reported as timed out regardless of what is still alive. */
+export const INSTALL_KILL_GRACE_MS = 5_000
+
+/** Run the install command with a real deadline. npm forks a tree (scripts,
+ * node), and a descendant that outlives npm can keep the stderr pipe open, so
+ * the run settles on the child's `exit`, never on `close`, and the deadline
+ * signals the whole process group (POSIX: the child is its own group leader;
+ * Windows: taskkill /T) — SIGTERM first, SIGKILL after the grace, then the run
+ * reports the timeout whether or not anything is still holding a pipe. */
+export function runInstall(
+  argv: string[],
+  timeoutMs = INSTALL_TIMEOUT_MS,
+  graceMs = INSTALL_KILL_GRACE_MS,
+): Promise<InstallRun> {
+  if (syncInternals.runInstall) return syncInternals.runInstall(argv, timeoutMs)
+  return new Promise((resolve) => {
+    const grouped = process.platform !== "win32"
+    let child: ChildProcess
+    try {
+      child = launch(argv[0], argv.slice(1), {
+        stdio: ["ignore", "ignore", "pipe"],
+        detached: grouped,
+        windowsHide: process.platform === "win32",
+      })
+    } catch (err) {
+      resolve({ code: null, timedOut: false, stderr: err instanceof Error ? err.message : String(err) })
+      return
+    }
+    let stderr = ""
+    child.stderr?.on("data", (chunk) => {
+      stderr = (stderr + String(chunk)).slice(-4096)
+    })
+    let timedOut = false
+    let settled = false
+    let hard: ReturnType<typeof setTimeout> | undefined
+    const finish = (code: number | null) => {
+      if (settled) return
+      settled = true
+      clearTimeout(timer)
+      // Past the deadline the escalation stays armed: npm (the group leader)
+      // usually dies on SIGTERM, but a descendant that ignores it must still
+      // get the SIGKILL, so the leader's exit does not cancel it.
+      if (hard && !timedOut) clearTimeout(hard)
+      resolve({ code, timedOut, stderr })
+    }
+    const killTree = (signal: NodeJS.Signals) => {
+      if (grouped && child.pid) {
+        try {
+          process.kill(-child.pid, signal)
+          return
+        } catch {
+          // The group is already gone; fall through to the child itself.
+        }
+      }
+      if (process.platform === "win32") {
+        void Process.stop(child)
+        return
+      }
+      try {
+        child.kill(signal)
+      } catch {
+        // Already exited.
+      }
+    }
+    const timer = setTimeout(() => {
+      timedOut = true
+      killTree("SIGTERM")
+      hard = setTimeout(() => {
+        // The group outlives its leader while any member is alive, so this
+        // reaches survivors even after npm itself has exited.
+        killTree("SIGKILL")
+        finish(null)
+      }, graceMs)
+    }, timeoutMs)
+    child.once("exit", (code) => finish(code))
+    child.once("error", (err) => {
+      stderr = stderr || err.message
+      finish(null)
+    })
+  })
+}
+
+/** `npm i -g <spec>` with a deadline (`runInstall`). A zero exit is not a
+ * usable engine — npm's global bin directory need not be on PATH — so the same
+ * discovery the turn boundary does runs before success. */
+export async function installEngine(): Promise<InstallResult> {
+  const spec = installSpec()
+  if (syncInternals.install) return syncInternals.install(spec)
+  const npm = process.platform === "win32" ? "npm.cmd" : "npm"
+  const run = await runInstall([npm, "i", "-g", spec])
+  if (run.timedOut) {
+    return { ok: false, error: `npm did not finish within ${Math.round(INSTALL_TIMEOUT_MS / 60_000)} minutes` }
+  }
+  if (run.code === 0) {
+    const installedBin = which(ENGINE_BINARY)
+    if (!installedBin) {
+      return {
+        ok: false,
+        error: `npm installed it, but ${ENGINE_BINARY} is not on PATH — add your npm global bin directory to PATH`,
+      }
+    }
+    const installedVersion = await versionOf(installedBin)
+    if (!clearsFloor(installedVersion)) {
+      return {
+        ok: false,
+        error: `npm installed it, but ${ENGINE_BINARY} on PATH reports ${installedVersion ?? "no version"}`,
+      }
+    }
+    return { ok: true }
+  }
+  const detail = run.stderr.trim().split(/\r?\n/).slice(-3).join(" ")
+  return { ok: false, error: detail || `npm exited with code ${run.code ?? "unknown"}` }
+}
+
+/** Ask the TUI to raise the offer. False when the bus is unavailable. The
+ * session is carried so an attached headless run, which reads the same event
+ * stream, prints the offer raised for its own session only. */
+async function publishOffer(sessionID: string): Promise<boolean> {
+  if (syncInternals.publishOffer) return syncInternals.publishOffer(sessionID)
+  try {
+    await AppRuntime.runPromise(
+      EventV2Bridge.Service.use((events) =>
+        events.publish(TuiEvent.CommandExecute, { command: OFFER_COMMAND, sessionID }),
+      ),
+    )
+    return true
+  } catch (err) {
+    log.warn("could not publish the engine install offer", { err: String(err) })
+    return false
+  }
+}
+
+/** Hand the offer to a same-realm surface. False when none is registered. */
+function offerInstall(offer: EngineOffer): boolean {
+  const handler = syncInternals.offer
+  if (!handler) return false
+  try {
+    return handler(offer)
+  } catch (err) {
+    log.warn("install offer surface failed; falling back to toast", { err: String(err) })
+    return false
+  }
+}
+
+/** One printed line for headless `run`. */
+export function describeOfferLine(offer: EngineOffer): string {
+  const tools = `${offer.declared} integration tool${offer.declared === 1 ? "" : "s"}`
+  return offer.reason === "engine-too-old"
+    ? `Workspace "${offer.workspaceName}": ${tools} need ${ENGINE_BINARY} ${MIN_ENGINE_VERSION}+ (found ${offer.found ?? "unknown"}). Update with: ${offer.command}`
+    : `Workspace "${offer.workspaceName}": ${tools} need the local engine, which is not installed. Install it with: ${offer.command}`
+}
+
+/** Offer via the dialog surface when there is one; otherwise print (headless)
+ * or toast (bus unavailable). Exactly one of these happens. */
+export async function offerOrNotify(offer: EngineOffer, toast: Toast, sessionID: string): Promise<void> {
+  if (isHeadless()) {
+    printLine(describeOfferLine(offer))
+    return
+  }
+  if (offerInstall(offer)) return
+  if (await publishOffer(sessionID)) return
+  await notify(toast)
+}