This means waiting for hours, if not days, for the movie to be fully uploaded prior to sharing. Well, torrent eliminate that waiting time — making your movie ready as soon as you create and share a torrent files.
Lucky for you, there are only two things that you need to meet:. Keep on reading. They will be able to use it by adding the file to uTorrent — which will begin to download the file immediately.
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First I would have a single list of all pieces that have already been requested that would get passed to each socket connection. Like this:. The actual implementation of haveHandler will be more detailed than this, but you can see how the requested list will get passed through and how it will be used to determine whether or not a piece should be requested. You can also see that there is just a single list that is shared by all connections.
Next I want to create a list per connection. This list will contain all the pieces that a single peer has. Why do we have to maintain this list? This strategy would lead to all peers having the same number of requests, but some peers will inevitably upload faster than others.
Ideally we want the fastest peers to get more requests, rather than have multiple requests bottlenecked by the slowest peer. A natural solution is to request just one or a few pieces from a peer at a time, and only make the next request after receiving a response. I refer to this as a job queue, because you can think of it like this: each connection has a list of pieces to request.
If not, they request the piece and wait for a response. Otherwise they discard the item and move on to the next one. When they receive a response, they move on to the next item on the list and repeat the process until the list is empty.
This list will also need to passed through to the handler functions, but it should be created per connection. When we receive a piece we can shift it out of the queue.
If the piece has already been requested, we again shift it out of the queue. You can see that happen in the requestPiece function which created since it is code shared by both handlers. The last thing I want to go over before fully implementing the handler functions is request failures. Right now we are adding the piece index to the requested array whenever we send a request. This way we know which pieces have already been requested and then we can avoid the next peer from requesting a duplicate piece.
This is because a connection can drop at any time for whatever reason. Since we avoid requesting pieces that have been added to the requested array, these pieces will never be received. You might think we could just add pieces to the list when we receive them. But then between the time that the piece requested and received any other peer could also request that piece resulting in duplicate requests. We update the requested list at request time, and the received list at receive time.
This object can now be used to replace the requested array from earlier. I think the simplest way to enforce this is to create a new object that holds both our queue array as well as a choked property. Fortunately most of it was covered in the previous sections. Most of these changes are simply passing our two new data structures Pieces and queue object through through to the handlers. In the previous section I changed the Pieces class so that its constructor takes the total number of pieces as an argument.
You can find this value by looking up the torrent. The torrent. Finally we add the requested index into pieces and break the loop. You might have noticed that I wrote a comment above socket. The function message. These are the required fields for the payload of a request message. But what are these fields for exactly? What about begin and length? These two properties are necessary because sometimes a piece is too big for one message. If the piece length is greater than the length of single block, then it should be broken up into blocks with one message sent for each block.
But first I want to write some function in torrentParser. Then it might be shorter than a full piece or block. Also, both the queue object and the Pieces class should be changed to deal with blocks instead of just pieces. Now the queue is a list of pieceBlock objects.
These pieceBlock objects have the same structure as the payload when we send a request message check the buildRequest function in message. More generally, from now on we want to deal with these objects instead of the piece index, because it also gives us information about the block.
When we deque an object we can pass it to the request builder and make a request for the associated block. The Pieces class that tracks requested and received pieces should be able to add a pieceBlock.
Note that the constructor need to get passed a torrent object now, instead of just the number of pieces. Now the requested and received arrays, which used to hold the status of a piece index, now holds an array of arrays, where the inner arrays hold the status of a block at a give piece index.
As before all values are initially set to false. Also note that these methods expect to be passed a pieceBlock, the same ones we saw in the Queue class. Also we now use the pieceBlock object instead of just the piece index.
These two messages do roughly the same thing, which is tell us which pieces the peer has for sharing. This will add the piece index into the queue. We also want to kick off the piece requesting process if this is the first item added to the queue. Why only the first? Because as we discussed before , we want to wait for the piece response to come back before requesting the next piece. The payload here is a buffer, which you can think of as a long string of bits. If the peer has the index-0 piece, then the first bit will be a 1.
If not it will be 0. If they have the index-1 piece, then the next bit will be 1, 0 if not. Your Privacy. When you visit our website, we or third parties collect information, including through the use of cookies or similar technologies. This information might relate to you such as your use and interaction with the site, products purchased or considered, your preferences, identifiers, your device, and inferences made from this information. It is mostly used to make the site work as you expect it to, to provide a more personalized web experience, and advertising.
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