overwrite={true,false}

[weiribao]

Add an option

overwrite={true,false}

if md5url.out is found on disk and forceUpdate=true,

move md5url.{out,data,datax} to md5url.md5data.{out,data,datax}.

In the JSON string, also return

md5data: [md5data1,md5data2, ...]
createTime: [time1,time2, ...
requestSentTime: [time1,time2, ...]

where the first value in each array corresponds to the current request.

I could imagine that I would also want to keep only the diffs. So instead of writing md5url.md5data.{out,data,datax}, we would write md5url.md5data.{out,data,datax}.diff which is the diff with respect to the previous version. This would require an option

keepdiffs={true,false}

and then require you to call diff or xdiff with a system command and a configuration option for the plug-in for the command line arguments to diff.

[rweigel]

Simple implementation:

(1) Modify code to always write files as md5url.md5data.{}.
(2) When looking for cached files search list of files md5url. and keep the most recent.

Later, start storing log file information in database. MongoDB integrates nicely with Node.js.

Deal with storing diffs later.