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Path: /opt/alt/alt-nodejs24/root/usr/lib/node_modules/npm/lib/utils/

Viewing File: log-file.js

const os = require('node:os')
const { join, dirname, basename } = require('node:path')
const fsMiniPass = require('fs-minipass')
const fs = require('node:fs/promises')
const { log } = require('proc-log')
const { formatWithOptions } = require('./format')

const padZero = (n, length) => n.toString().padStart(length.toString().length, '0')

class LogFiles {
  // Default to an array so we can buffer
  // initial writes before we know the cache location
  #logStream = []

  // We cap log files at a certain number of log events per file.
  // Note that each log event can write more than one line to the
  // file. Then we rotate log files once this number of events is reached
  #MAX_LOGS_PER_FILE = null

  // Now that we write logs continuously we need to have a backstop
  // here for infinite loops that still log. This is also partially handled
  // by the config.get('max-files') option, but this is a failsafe to
  // prevent runaway log file creation
  #MAX_FILES_PER_PROCESS = null

  #fileLogCount = 0
  #totalLogCount = 0
  #path = null
  #logsMax = null
  #files = []
  #timing = false

  constructor ({
    maxLogsPerFile = 50_000,
    maxFilesPerProcess = 5,
  } = {}) {
    this.#MAX_LOGS_PER_FILE = maxLogsPerFile
    this.#MAX_FILES_PER_PROCESS = maxFilesPerProcess
    this.on()
  }

  on () {
    process.on('log', this.#logHandler)
  }

  off () {
    process.off('log', this.#logHandler)
    this.#endStream()
  }

  load ({ command, path, logsMax = Infinity, timing } = {}) {
    if (['completion'].includes(command)) {
      return
    }

    // dir is user configurable and is required to exist so
    // this can error if the dir is missing or not configured correctly
    this.#path = path
    this.#logsMax = logsMax
    this.#timing = timing

    // Log stream has already ended
    if (!this.#logStream) {
      return
    }

    log.verbose('logfile', `logs-max:${logsMax} dir:${this.#path}`)

    // Write the contents of our array buffer to our new file stream and
    // set that as the new log logstream for future writes
    // if logs max is 0 then the user does not want a log file
    if (this.#logsMax > 0) {
      const initialFile = this.#openLogFile()
      if (initialFile) {
        for (const item of this.#logStream) {
          const formatted = this.#formatLogItem(...item)
          if (formatted !== null) {
            initialFile.write(formatted)
          }
        }
        this.#logStream = initialFile
      }
    }

    log.verbose('logfile', this.files[0] || 'no logfile created')

    // Kickoff cleaning process, even if we aren't writing a logfile.
    // This is async but it will always ignore the current logfile
    // Return the result so it can be awaited in tests
    return this.#cleanLogs()
  }

  get files () {
    return this.#files
  }

  get #isBuffered () {
    return Array.isArray(this.#logStream)
  }

  #endStream (output) {
    if (this.#logStream && !this.#isBuffered) {
      this.#logStream.end(output)
      this.#logStream = null
    }
  }

  #logHandler = (level, ...args) => {
    // Ignore pause and resume events since we
    // write everything to the log file
    if (level === 'pause' || level === 'resume') {
      return
    }

    // If the stream is ended then do nothing
    if (!this.#logStream) {
      return
    }

    if (this.#isBuffered) {
      // Cant do anything but buffer the output if we dont
      // have a file stream yet
      this.#logStream.push([level, ...args])
      return
    }

    const logOutput = this.#formatLogItem(level, ...args)
    if (logOutput === null) {
      return
    }

    // Open a new log file if we've written too many logs to this one
    if (this.#fileLogCount >= this.#MAX_LOGS_PER_FILE) {
      // Write last chunk to the file and close it
      this.#endStream(logOutput)
      if (this.#files.length >= this.#MAX_FILES_PER_PROCESS) {
        // but if its way too many then we just stop listening
        this.off()
      } else {
        // otherwise we are ready for a new file for the next event
        this.#logStream = this.#openLogFile()
      }
    } else {
      this.#logStream.write(logOutput)
    }
  }

  #formatLogItem (level, title, ...args) {
    // Only right timing logs to logfile if explicitly requests
    if (level === log.KEYS.timing && !this.#timing) {
      return null
    }

    this.#fileLogCount += 1
    const prefix = [this.#totalLogCount++, level, title || null]
    return formatWithOptions({ prefix, eol: os.EOL, colors: false }, ...args)
  }

  #getLogFilePath (count = '') {
    return `${this.#path}debug-${count}.log`
  }

  #openLogFile () {
    // Count in filename will be 0 indexed
    const count = this.#files.length

    try {
      // Pad with zeros so that our log files are always sorted properly
      // We never want to write files ending in `-9.log` and `-10.log` because
      // log file cleaning is done by deleting the oldest so in this example
      // `-10.log` would be deleted next
      const f = this.#getLogFilePath(padZero(count, this.#MAX_FILES_PER_PROCESS))
      // Some effort was made to make the async, but we need to write logs
      // during process.on('exit') which has to be synchronous. So in order
      // to never drop log messages, it is easiest to make it sync all the time
      // and this was measured to be about 1.5% slower for 40k lines of output
      const logStream = new fsMiniPass.WriteStreamSync(f, { flags: 'a' })
      if (count > 0) {
        // Reset file log count if we are opening
        // after our first file
        this.#fileLogCount = 0
      }
      this.#files.push(logStream.path)
      return logStream
    } catch (e) {
      // If the user has a readonly logdir then we don't want to
      // warn this on every command so it should be verbose
      log.verbose('logfile', `could not be created: ${e}`)
    }
  }

  async #cleanLogs () {
    // module to clean out the old log files
    // this is a best-effort attempt.  if a rm fails, we just
    // log a message about it and move on.  We do return a
    // Promise that succeeds when we've tried to delete everything,
    // just for the benefit of testing this function properly.

    try {
      const logPath = this.#getLogFilePath()
      const patternFileName = basename(logPath)
        // tell glob to only match digits
        .replace(/\d/g, 'd')
        // Handle the old (prior to 8.2.0) log file names which did not have a
        // counter suffix
        .replace('-.log', '')

      let files = await fs.readdir(
        dirname(logPath), {
          withFileTypes: true,
          encoding: 'utf-8',
        })
      files = files.sort((a, b) => basename(a.name).localeCompare(basename(b.name), 'en'))

      const logFiles = []

      for (const file of files) {
        if (!file.isFile()) {
          continue
        }

        const genericFileName = file.name.replace(/\d/g, 'd')
        const filePath = join(dirname(logPath), basename(file.name))

        // Always ignore the currently written files
        if (
          genericFileName.includes(patternFileName)
          && genericFileName.endsWith('.log')
          && !this.#files.includes(filePath)
        ) {
          logFiles.push(filePath)
        }
      }

      const toDelete = logFiles.length - this.#logsMax

      if (toDelete <= 0) {
        return
      }

      log.silly('logfile', `start cleaning logs, removing ${toDelete} files`)

      for (const file of logFiles.slice(0, toDelete)) {
        try {
          await fs.rm(file, { force: true })
        } catch (e) {
          log.silly('logfile', 'error removing log file', file, e)
        }
      }
    } catch (e) {
      // Disable cleanup failure warnings when log writing is disabled
      if (this.#logsMax > 0) {
        log.verbose('logfile', 'error cleaning log files', e)
      }
    } finally {
      log.silly('logfile', 'done cleaning log files')
    }
  }
}

module.exports = LogFiles
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