D-LAN

h1. Home

* [[Study of bittorent protocol]]

* [[Study of UPNP]]

* [[Study of UDP multicast]]

* [[Study of Thrift]]

* [[Study of Protocol Buffer]]

* [[Protocols]]

h2. Brainstorming

* 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. The speed of an unknown peer is maximum thus it will be take first. 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 which own a complete copy.

** A file from a user is identified by its name and its folder.

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

** The number of concurrent download is around 3 parts and the number of concurrent upload is unlimited.

** Recursive folder downloading, in this case the path is recreated in the downloading peer.

* 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 and their amount of sharing.

** A window to view the current downloads (leechage) and one for the current uploads (seedage). These windows are very similar.

** A window for the chat. There is no private chat. The chat uses UDP multicast (if possible).

** Some windows for each file browsing. The files and folders are seen like a tree (like in the Finder of Mac OS X)

** Some windows for each file searching. The displayed list is identical to the browsing list.

** 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 and CPU limitation with a single option (checkbox).

* 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, the list is dynamically filled for each peer answer.

* Using of systray (optional).

h3. Secondary ideas

* Parse meta data like ID3tag when searching.

* Graphics of the transfer rate over time.

* Free space management.

* Private chat

* Automatically detect a running game and set the limitation flag.