To properly close a transfer to the FTP server, you need to send an Abort command (see http://www.w3.org/Protocols/rfc959/4_FileTransfer.html (ABORT) ). Flex FTP doesn't support this so I added some functionality to be able to send an abort.
First I added the Abort command to the Commands class:
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public static const ABOR:String = "ABOR";
After that I added a new invoker to the invokers package, AbortInv.
The FTPInvoker class required a new public method to support the Abort command, which can be overridden by the specific implementations. In FTPInvoker I added an abort method like this:
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/**
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* Stops this Invoker from executing.
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*/
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public function abort():void {
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// Some Invokers just don't need to do anything.
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finalize();
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}
There was only one invoker where I had to override the abort method to get things working correctly and that was the UploadInv class. Here I added the following code:
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/**
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* @inheritDoc
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*/
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override public function abort():void {
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super.abort();
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if(interval) clearInterval(interval);
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if(sourceFile) sourceFile.close();
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if(passiveSocket && passiveSocket.connected) passiveSocket.close();
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}
After that it was a matter of updating the FTPClient class with an abort method to get the circle complete.
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/**
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* Aborts the previous FTP command.
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*/
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public function abort():void {
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if(currentProcess) {
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if(currentProcess is UploadInv) {
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swallowNextResponse = true;
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}
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currentProcess.abort();
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currentProcess = null;
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}
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invoke( new AbortInv(this) );
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}
Unfortunately I also had to update handleData method in the FTPClient class a little bit, because aborting an upload would result into 2 (or more) resonses at once from the FTP server.
My handleData method now looks like this:
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private function handleData (pEvt:ProgressEvent):void
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{
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processing = false;
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var response:String = ctrlSocket.readUTFBytes(ctrlSocket.bytesAvailable);
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var responseList:Array = response.split("\n");
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// Apparently we always get a linebreak with a response...
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responseList.pop();
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var eventList:Array = new Array();
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var evt:FTPEvent;
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for(var i:int = 0; i <responseList.length; i++) {
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evt = new FTPEvent(FTPEvent.RESPONSE);
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evt.response = FTPResponse.parseResponse(responseList[i]);
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eventList.push(evt);
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if (FTPClient.DEBUG) trace("->" + evt.response.code+" "+evt.response.message);
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}
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if(swallowNextResponse) {
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if (FTPClient.DEBUG) trace(" - ignoring this response...");
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swallowNextResponse = false;
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responseList.shift();
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}
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if(responseList.length> 0) {
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for(var k:int = 0; k <responseList.length; k++) {
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dispatchEvent(eventList[k]);
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}
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}
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}
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