Compress may cause Error: EPERM: operation not permitted open 'xxx\xxxx\xxxxx\myfile'. It`s ok with the option of compress is false.

報告された stack trace を手がかりに、lib/RollingFileWriteStream.js の _shouldRoll、_moveOldFiles、_renewWriteStream を中心に調査を始めてください。提供された index.js、compress: true、開いた状態の myfile を使って Windows で再現します。ファイルのローテーション中に繰り返し実行しても EPERM が発生しなくなれば完了です。

This issue is discovered from "log4js-node", The latest version of "log4js-node" has the same issue because of this dependency.

replicate step:

1. Download source code of this project.
2. Create a 'index.js' file in root of this project.
3. Input content in 'index.js' file:

var rollers = require('./lib/index');
var stream = new rollers.RollingFileStream('myfile', 10000, 12, {
  compress: true,
});

for (let i = 0; i < 30; i++) {
  // console.log(i);
  stream.write(getContent());
}

stream.end();

function getContent() {
  return `
  {
      a: {a: 1, b: 2, c: 3, d: 4, e: 5, f: 123321, g: 234432432, h: 31321, i: 23232, j: 23432423432432, k: 1123321},
      b: {a: 1, b: 2, c: 3, d: 4, e: 5, f: 123321, g: 234432432, h: 31321, i: 23232, j: 23432423432432, k: 1123321},
      c: {a: 1, b: 2, c: 3, d: 4, e: 5, f: 123321, g: 234432432, h: 31321, i: 23232, j: 23432423432432, k: 1123321},
     ......... // 70000 lines repeated
  }`
}

4. Execute node index.js in terminal.
5. Open the hot file "myfile" with notebook or VSCode as you like. This step is very important. The issue will not replicate without this step.
6. Execute node index.js in terminal again. If no error occur, you can execute more times. The probability is very high, more than 50%.

Finally get this error in terminal:

Error: EPERM: operation not permitted, open 'D:\nodeProgram\TEST\test-streamroller\streamroller-master\myfile'
at Object.openSync (node:fs:596:3)
at Object.writeFileSync (node:fs:2322:35)
at Object.appendFileSync (node:fs:2384:6)
at RollingFileStream._renewWriteStream (D:\nodeProgram\TEST\test-streamroller\streamroller-master\lib\RollingFileWriteStream.js:312:8)
at RollingFileStream._moveOldFiles (D:\nodeProgram\TEST\test-streamroller\streamroller-master\lib\RollingFileWriteStream.js:232:10)
at async RollingFileStream._shouldRoll (D:\nodeProgram\TEST\test-streamroller\streamroller-master\lib\RollingFileWriteStream.js:170:7) {
errno: -4048,
syscall: 'open',
code: 'EPERM',
path: 'D:\nodeProgram\TEST\test-streamroller\streamroller-master\myfile'
}