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Previous Comments. Live it Well — Switchfoot lyrics 5. Your Opportunity for Involvement 58 comments since Most of this code is pretty straightforward. Also a bit surprising that you can call join on a buffer.
This is a bit fancy as it coerces the bytes into a string but seems to work and I think it looks nice. I created a new file called torrent-parser. This means I also want to move the code for opening a torrent file here. Remember it looked something like this:.
Last time we pulled the announce property from this object. Can you see that it also has an info property? If you were take the info property and pass it through a SHA1 hashing function, you would get the info hash! You can apply a SHA1 hash easily using the built-in crypto module. Why use a SHA1 hashing function?
A hashing function returns a fixed length buffer in this case bytes long. Actually we just send the whole size of the torrent files. There are two cases we have to consider - torrents that have one file or more than one file. But if it has multiple files, it will have a torrent. We have to iterate over these file objects and sum their length property. The easiest way to deal with this is to install a module to handle larger number for us. Install it with the command:.
You can see that I write the number into a buffer using the bignum. This is also the buffer size required by the announce request. Now almost all the pieces have come together for communicating with the tracker. The last thing we have to do is write the respType function to identify whether a response was a connect response or an announce response. After looking at the structure of the two response types I noticed that the connect response has an action value of 0 and the announce response has an action value of 1.
Or you could write your own function to retry after a timeout as a bonus exercise! This is called exponential backoff and the reason you want to do this is to balance two concerns. The message is still coming, but the network is experiencing traffic. The more peers you can get connected to the faster you can download your files. After exchanging some messages with the peer as setup, you should start requesting pieces of the files you want.
Before we start I want to add a new file called download. I recommend that you find a small torrent with a lot of peers that you can play around with. Our new file structure should look like this:. Note the updated require paths. Using tcp to send messages is similar to udp which we used before. You can see the tcp interface is very similar to using udp, but you have to call the connect method to create a connection before sending any messages.
This will log the error to console instead. We use our getPeers method from the tracker. Once a tcp connection is established the messages you send and receive have to follow the following protocol.
The first thing you want to do is let your peer know know which files you are interested in downloading from them, as well as some identifying info. The most likely thing that will happen next is that the peer will let you know what pieces they have. This means you will receive multiple have messages, one for each piece that your peer has. The bitfield message serves a similar purpose, but does it in a different way.
The bitfield message can tell you all the pieces that the peer has in just one message. It does this by sending a string of bits, one for each piece in the file. The index of each bit is the same as the piece index, and if they have that piece it will be set to 1, if not it will be set to 0.
If you are choked, that means the peer does not want to share with you, if you are unchoked then the peer is willing to share. You always start out choked and not interested. So the first message you send should be the interested message. Then hopefully they will send you an unchoke message and you can move to the next step. If you receive a choke message message instead you can just let the connection drop.
Finally you will receive a piece message, which will contain the bytes of data that you requested. Real, Live Memories. The First Goodbye. If You Liked Making It. Family Game Fight! Hollywood Game Night. American Ninja Warrior. Capital One College Bowl.
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