proxymock-cli/lib/utils.js

proxymock-cli

const crypto = require('crypto');
const fs = require('fs');

const fileContentMd5Cache = Object.create(null);

exports.isFile = (p) => {
  try {
    if (fs.statSync(p).isFile()) {
      return true;
    }
  }
  catch (e) {
  }
  return false;
}

exports.isDirectory = (p) => {
  try {
    if (fs.statSync(p).isDirectory()) {
      return true;
    }
  }
  catch (e) {
  }
  return false;
}

exports.writeFile = (filepath, data, callback) => {
  let cntMd5 = crypto.createHash('md5').update(data).digest('hex');
  if (isFile(filepath)) {
    exports.readFile(filepath, (err, content) => {
      if (err) {
        console.error(`read file error: [${filepath}].`);
        return;
      }
      let contentMd5 = crypto.createHash('md5').update(content).digest('hex');	
      if (contentMd5 === cntMd5) {
        callback();
      }
    });
  }
  else {
    console.log(`md5 not match, save new content to: [${filepath}].`);
    fs.writeFile(filepath, data, 'utf-8', callback);
  }
}

exports.pWriteFile = (filepath, data) => {
  return new Promise((resolve, reject) => {
    exports.writeFile(filepath, data, (e, v) => e ? reject(e) : resolve(v));
  });
}

exports.readFile = (filepath, callback) => {
  if (!exports.isFile(filepath)) {
    callback(null, '');
  }
  else {
    fs.readFile(filepath, 'utf-8', callback);
  }
}

exports.pReadFile = (filepath) => {
  return new Promise((resolve, reject) => {
    exports.readFile(filepath, (e, v) => e ? reject(e) : resolve(v));
  });
}

exports.getChangedFileContent = async filepath => {
  const content = await exports.pReadFile(filepath);
  const contentMd5 = crypto.createHash('md5').update(content).digest('hex');
  const oldContentMd5 = fileContentMd5Cache[filepath];
  if (oldContentMd5 === contentMd5) {
    return '';
  }
  
  fileContentMd5Cache[filepath] = contentMd5;
  return content;
}

exports.getAddedFileContent = async filepath => {
  const content = await exports.pReadFile(filepath);
  const contentMd5 = crypto.createHash('md5').update(content).digest('hex');
  fileContentMd5Cache[filepath] = contentMd5;
  return content;
}