Hello all, Earlier this year I implemented an ftplet to implement a push publishing system that would queue a message to a beanstalk message queue that is watched by a number or file and web workers that move the uploaded files via scp to our webserver and posts metadata to the website. It works great except for one really big problem.
The problem is that FTP does not send any headers regarding file size or any other information that will help show when the file has finished uploading. In my ftplet I use the onUploadEnd() method to handle an upload event and to send the message queue message. However, if the client temporarily drops the connection before completing the upload this handler is still called and the message gets sent. When the client reestablishes the connection it appends to the file and the onAppendStart() and onAppendEnd() methods are called. I am using 1.06 release - My questions: 1. Is there any way for me to distinguish, in the onUploadEnd() handler, that the upload is not complete, but rather a dropped connection? I don't think there is. 2. When an upload append (APPE) request is sent do the onUploadStart/End() handlers get called as well as the onAppendStart/End() methods? 3. When an upload unique (STOU) request is sent do the onUploadStart/End() handlers get called as well as the onUploadUniqueStart/End() methods? 4. Is there any way at all to know if an upload is complete or whether to expect or anticipate that an append event might be forthcoming? 5. Has anyone faced the same challenge who might be able to give me a few tips on how you resolved it? Thank you for any help and/or guidance you might be able to provide. In all Apache FTP has been awesome in implementing our push publishing. I think we just might be hitting against the limitations of the FTP protocols themselves, rather than anything intrinsic to Apache Mina. -- Nicholas Cowham Software Engineer http://www.demotix.com Demotix Profile <http://www.demotix.com/users/ncowham/profile> | Twitter<http://twitter.com/NykOfTime>
