Clean up the console message for possible S3 errors

* Since OpenUserJS#1086 haven't seen any of these yet for OpenUserJS#486
* Use an environment variable to toggle monitoring this for now


Applies to OpenUserJS#430

controllers/scriptStorage.js

@@ -331,10 +331,15 @@ exports.getSource = function (aReq, aCallback) {
  Bucket: bucketName,
  Key: installNameBase + (isLib ? '.js' : '.user.js')
 
- }).createReadStream().on('error', function () {
- // TODO: #486
- if (isDbg) {
- console.error('S3 key not found for', installNameBase + (isLib ? '.js' : '.user.js'));
+ }).createReadStream().on('error', function (aE) {
+ // Possible #486 modification
+ if (isDbg || process.env.MONITOR_S3_READ_ERR === 'true') {
+ console.error(
+ 'S3 GET',
+ aE.code,
+ 'for', installNameBase + (isLib ? '.js' : '.user.js'),
+ 'in the', bucketName, 'bucket'
+ );
  }
 
  aCallback(null);