Function download

scripts/compareSize.js:87–125

(url, dest)

// Resolve only so that we can attempt a hardcoded link download if the commit one fails. TODO: revert back to reject when we get some intial data from a publish.
function download(url, dest) {
  return new Promise((resolve, reject) => {
    // Check file does not exist yet before hitting network
    fs.access(dest, fs.constants.F_OK, err => {
      if (err === null) {
        console.error(`File already exists at ${dest}`);
        resolve();
      }
      let request = https.get(url, response => {
        if (response.statusCode === 200) {
          const file = fs.createWriteStream(dest, {flags: 'wx'});
          file.on('finish', () => resolve());
          file.on('error', err => {
            file.close();
            if (err.code === 'EEXIST') {
              console.error(`File was created during the request call at ${dest}`);
              resolve();
            } else {
              // Delete temp file
              fs.unlink(dest, () => {
                console.error(err.message);
                resolve();
              });
            }
          });
          response.pipe(file);
        } else {
          console.error(`Server responded with ${response.statusCode}: ${response.statusMessage}`);
          resolve();
        }
      });

      request.on('error', err => {
        console.error(err);
        resolve();
      });
    });
  });
}