1 files changed, 185 insertions, 0 deletions
diff --git a/packages/core/src/util/log.ts b/packages/core/src/util/log.ts
new file mode 100644
index 000000000..a61c15f7a
--- /dev/null
+++ b/packages/core/src/util/log.ts
@@ -0,0 +1,185 @@
+import path from "path"
+import fs from "fs/promises"
+import { createWriteStream } from "fs"
+import * as Global from "../global"
+import z from "zod"
+import { Glob } from "./glob"
+
+export const Level = z.enum(["DEBUG", "INFO", "WARN", "ERROR"]).meta({ ref: "LogLevel", description: "Log level" })
+export type Level = z.infer<typeof Level>
+
+const levelPriority: Record<Level, number> = {
+  DEBUG: 0,
+  INFO: 1,
+  WARN: 2,
+  ERROR: 3,
+}
+const keep = 10
+
+let level: Level = "INFO"
+
+function shouldLog(input: Level): boolean {
+  return levelPriority[input] >= levelPriority[level]
+}
+
+export type Logger = {
+  debug(message?: any, extra?: Record<string, any>): void
+  info(message?: any, extra?: Record<string, any>): void
+  error(message?: any, extra?: Record<string, any>): void
+  warn(message?: any, extra?: Record<string, any>): void
+  tag(key: string, value: string): Logger
+  clone(): Logger
+  time(
+    message: string,
+    extra?: Record<string, any>,
+  ): {
+    stop(): void
+    [Symbol.dispose](): void
+  }
+}
+
+const loggers = new Map<string, Logger>()
+
+export const Default = create({ service: "default" })
+
+export interface Options {
+  print: boolean
+  dev?: boolean
+  level?: Level
+}
+
+let logpath = ""
+export function file() {
+  return logpath
+}
+let write = (msg: any) => {
+  process.stderr.write(msg)
+  return msg.length
+}
+
+export async function init(options: Options) {
+  if (options.level) level = options.level
+  void cleanup(Global.Path.log)
+  if (options.print) return
+  logpath = path.join(
+    Global.Path.log,
+    options.dev ? "dev.log" : new Date().toISOString().split(".")[0].replace(/:/g, "") + ".log",
+  )
+  await fs.truncate(logpath).catch(() => {})
+  const stream = createWriteStream(logpath, { flags: "a" })
+  write = async (msg: any) => {
+    return new Promise((resolve, reject) => {
+      stream.write(msg, (err) => {
+        if (err) reject(err)
+        else resolve(msg.length)
+      })
+    })
+  }
+}
+
+async function cleanup(dir: string) {
+  const files = (
+    await Glob.scan("????-??-??T??????.log", {
+      cwd: dir,
+      absolute: false,
+      include: "file",
+    }).catch(() => [])
+  )
+    .filter((file) => path.basename(file) === file)
+    .sort()
+  if (files.length <= keep) return
+
+  const doomed = files.slice(0, -keep)
+  await Promise.all(doomed.map((file) => fs.unlink(path.join(dir, file)).catch(() => {})))
+}
+
+function formatError(error: Error, depth = 0): string {
+  const result = error.message
+  return error.cause instanceof Error && depth < 10
+    ? result + " Caused by: " + formatError(error.cause, depth + 1)
+    : result
+}
+
+let last = Date.now()
+export function create(tags?: Record<string, any>) {
+  tags = tags || {}
+
+  const service = tags["service"]
+  if (service && typeof service === "string") {
+    const cached = loggers.get(service)
+    if (cached) {
+      return cached
+    }
+  }
+
+  function build(message: any, extra?: Record<string, any>) {
+    const prefix = Object.entries({
+      ...tags,
+      ...extra,
+    })
+      .filter(([_, value]) => value !== undefined && value !== null)
+      .map(([key, value]) => {
+        const prefix = `${key}=`
+        if (value instanceof Error) return prefix + formatError(value)
+        if (typeof value === "object") return prefix + JSON.stringify(value)
+        return prefix + value
+      })
+      .join(" ")
+    const next = new Date()
+    const diff = next.getTime() - last
+    last = next.getTime()
+    return [next.toISOString().split(".")[0], "+" + diff + "ms", prefix, message].filter(Boolean).join(" ") + "\n"
+  }
+  const result: Logger = {
+    debug(message?: any, extra?: Record<string, any>) {
+      if (shouldLog("DEBUG")) {
+        write("DEBUG " + build(message, extra))
+      }
+    },
+    info(message?: any, extra?: Record<string, any>) {
+      if (shouldLog("INFO")) {
+        write("INFO  " + build(message, extra))
+      }
+    },
+    error(message?: any, extra?: Record<string, any>) {
+      if (shouldLog("ERROR")) {
+        write("ERROR " + build(message, extra))
+      }
+    },
+    warn(message?: any, extra?: Record<string, any>) {
+      if (shouldLog("WARN")) {
+        write("WARN  " + build(message, extra))
+      }
+    },
+    tag(key: string, value: string) {
+      if (tags) tags[key] = value
+      return result
+    },
+    clone() {
+      return create({ ...tags })
+    },
+    time(message: string, extra?: Record<string, any>) {
+      const now = Date.now()
+      result.info(message, { status: "started", ...extra })
+      function stop() {
+        result.info(message, {
+          status: "completed",
+          duration: Date.now() - now,
+          ...extra,
+        })
+      }
+      return {
+        stop,
+        [Symbol.dispose]() {
+          stop()
+        },
+      }
+    },
+  }
+
+  if (service && typeof service === "string") {
+    loggers.set(service, result)
+  }
+
+  return result
+}