On Apr 18, 2017, at 9:01 AM, Zahir Lalani <[email protected]> wrote:
>
> We are also looking into chunked uploads
For anything taking more than a couple of seconds or 2 GB (whichever comes
first) you should indeed be using HTML5’s new File API to send chunks of the
file individually rather than try to send it all at once.
> we should be looking at the content range header or similar to prevent this
No, you should be sending query parameters that identify which chunk number
this is and how many more chunks there will be, so that the Dancer route
handler you’re sending this to knows when it has received the last chunk.
Dancer pseudocode:
post ‘/upload’ => sub {
my $chunkNumber = params ‘chunkNumber’;
return { error => ‘no chunk number’ }
unless isNaturalNumber($chunkNumber);
my $chunkCount = params ‘chunkCount’;
my $chunk = request->upload(‘chunk’);
# Do something intelligent with $chunk*
}
HTML pseudocode:
<input type=“file” onchange=“sendFile(this.files[0]”>
jQuery pseudocode:
function sendFile(file) {
var chunkSize = X; // a base-2 “round” number suitable to your app
var fileBytes = file.size;
var numChunks = Math.floor(fileBytes / chunkSize + 1);
function sendChunk() {
var start, end; // calculated using available values
var chunk = file.slice(start, end);
var fd = new FormData();
fd.append(‘chunk', chunk);
fd.append(‘chunkNumber', chunksSent);
fd.append(‘chunkCount', chunksTotal);
$.ajax(‘/upload’, {
data: fd,
success: function() {
if (++chunksSent < numChunks) sendChunk();
},
});
}
sendChunk();
}
That will certainly not run as-is, but if it should be sufficient to get you to
working code.
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