desktop: add electron version (#15663)

packages/desktop-electron/src/main/logging.ts

@@ -0,0 +1,40 @@
+import log from "electron-log/main.js"
+import { readFileSync, readdirSync, statSync, unlinkSync } from "node:fs"
+import { dirname, join } from "node:path"
+
+const MAX_LOG_AGE_DAYS = 7
+const TAIL_LINES = 1000
+
+export function initLogging() {
+  log.transports.file.maxSize = 5 * 1024 * 1024
+  cleanup()
+  return log
+}
+
+export function tail(): string {
+  try {
+    const path = log.transports.file.getFile().path
+    const contents = readFileSync(path, "utf8")
+    const lines = contents.split("\n")
+    return lines.slice(Math.max(0, lines.length - TAIL_LINES)).join("\n")
+  } catch {
+    return ""
+  }
+}
+
+function cleanup() {
+  const path = log.transports.file.getFile().path
+  const dir = dirname(path)
+  const cutoff = Date.now() - MAX_LOG_AGE_DAYS * 24 * 60 * 60 * 1000
+
+  for (const entry of readdirSync(dir)) {
+    const file = join(dir, entry)
+    try {
+      const info = statSync(file)
+      if (!info.isFile()) continue
+      if (info.mtimeMs < cutoff) unlinkSync(file)
+    } catch {
+      continue
+    }
+  }
+}