Protocol core-core Version 3 » History » Revision 27
Revision 26 (Greg Burri, 07/09/2009 11:24 AM) → Revision 27/73 (Greg Burri, 07/09/2009 01:29 PM)
h1. Protocols This page describes the protocols used by Aybabtu for network communication between cores and between core and GUI. h2. Core <-> Core h3. Notes pour plus tards * Le message _HaveChunks_ doit être multicast et la réponse est un datagramme UDP. Il n'est pas possible de maintenir N-1 connexion TCP en permanence ou N est le nombre de peer. (à mesurer). DU coup ce message peut remplacer le _IMAlive_ See source:protos/network_protocol.proto for message details. There is no more than one downloading from B to A. A peer which a download is active is setted as not free. There is _NbDownloadThread_ thread T. Each thread will choose a free chunk and download it. Here is the thread loop. <pre> F : take the list of all unfinished download C : A list of chunk candidates (empty at start) While not end of F - Take the next first file not finished in F -> f. If the hash chunks of a file are unknown : - Ask the hashes to the source (see the message _GetHashes _). For f for each chunk not downloaded download or not being downloaded -> c takes the best one : If c has a free peer : - add c to C -> p and p.downloadRate is the best. If C isn't empty : - Take the best chunk in C based on peer.downloadRate. there is some equals chunk, T will choose randomly among theses. If there is more than one best no free chunk then choose one randomly. - Grab go to the lock for next file. If the peer - Request hash chunks of a file are unknown then the download hashes are asked to the source, see the message _GetHashes _. </pre> h3. Parameters Most parameters will be stored as constants in their component. |_.Name|_.Value |_.Unit|_.Explanation/Comments| | _IMAliveFrequency_ | 0.1 | [Hz] | The message _IMAlive_ is sent each 10s. | | _ChunkSize_ | 33554432 | [Byte] | (32 MB) | | _LanSpeed_ | 52428800 | [Byte/s] | (50 MB/s) | | _TimeRecheckChunkFactor_ | 4 | - | If the time to download a chunk exceeds _TimeRecheckChunkFactor_ * _ChunkSize_ / _LanSpeed_ the peers are rescanned to choose a better one (better download rate). For example : 4 * 32 / 50 = 2.6 second | | _SwitchToAnotherPeerFactor_ | 1.5 | - | During the recheck of the peers to choose a better one the other download rate must be above the current * 1.5. | | _DownloadRateValidTime_ | 1500 / _LanSpeed_ = 300 s | [s] | (5 min). The download rate of a peer is only valid during this time after its last update. After that its rate is set to the maximum. | | _TimeBetweenChunksUpdate_ | 500 / _LanSpeed_ = 10 s | [s] | Each 10 s a daemon will scan the _NumberOfChunkToUpdate_ first chunks from the first queued downloads to know which peer has which chunk. | | _NumberOfChunkToUpdate_ | 100 * _LanSpeed_ / _ChunkSize_ = 156 | - | The first 156 hash chunks (3 kB) will by send periodically to each peer. See message _HaveChunks_ in the proto file. | | _FindTimeout_ | 15 | [s] | A search request is abandoned after 15 seconds from the start of the request. See message _Find_. | | _GetHashesTimeout_ | 200 | [s] | Timeout for the message _GetHashes_. | | _GetChunkTimeout_ | 10 | [s] | Timeout for the message _GetChunk_. | | _HaveChunksTimeout_ | _TimeBetweenChunksUpdate_ = 10 | [s] | Timeout for the message _HaveChunks_. | | _GetEntriesTimeout_ | 10 | [s] | Timeout for the message _GetEntries_. | | _NbDownloadThread_ | 3 | - | Number of concurrent downloading thread. | | _BufferSize_ | 1048576 | [Byte] | (1MB). This buffer is user when reading or writing a file. | | _TCPSocketBufferSize_ | 33554432 | [Byte] | (32Mo). Used when data are received. See _QAbstractSocket::setReadBufferSize_. | h2. Core <-> GUI