D-LAN

h1. Home

* [[Study of bittorent protocol]]

* [[Study of UPNP]]

* [[Protocol]]

h2. Description

A bit brainstormed for the moment ;)

* Core and GUI are independent. They communicate over TCP socket.

** It is possible to launch the core without the GUI. The core does not depend of any kind of graphic library.

** If the GUI crashes then the core remains.

* Designed for LAN usage (full trusted peers and very high speed transfers).

* Efficient (very low cpu usage).

* Distributed download (multi peer downloading and no central server).

** Quicker peer first. The speed of a peer is an average over a period of time say 5 min. A speed of a peer can be unknown. If a downloading is too slow (like three time slower than the best known peer) then it can switch to a quicker free peer.

** Rarest parts first.

** A part can be resumed from any peer.

** Fixed part size (2^24 B = 16 MB) hashed with SHA-1. Used to control the integrity of parts and to identify a file. A file is identified by the concatenation of all the SHA1 of all its parts. If the SHA-1 of a part does not match with the given SHA-1 then it will be re-downloaded entirely.

** Recursive folder downloading.

* There is a general chat.

* Multicast UDP for services discovering (maybe UPNP). Each peer announces periodically he is alive with a multicast message.

* MDI GUI with GTK2HS.

** A panel to view the current peers.

** A window to view the current downloads (leechage) and one for the current uploads (seedage).

** A window for the chat.

** A window for searching.

** Some windows for each file browsing.

** A modal window for the settings.

*** The shared folders.

*** The incoming folders (take the first if enough available space disk otherwise the second and so one..).

*** Bandwidth limitation.

* Using of "Thrift":http://incubator.apache.org/thrift/ for definition of the protocol between two peers and between the Core and the Gui.

* File list with name+size.

* Non blocking search.

* Using of systray (optional).

* Free space management.

* Graphics of the transfer rate over time.