<?xml version="1.0" encoding="iso-8859-1"?><?xml-stylesheet href="treestyles.css" type="text/css"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
-<html xml:lang="fi" xmlns="http://www.w3.org/1999/xhtml"><head><title>Generic Object
Sharing Protocol</title><link rel="stylesheet" href="Generic Object Sharing Protocol.html_files/treestyles.css" type="text/css"/><script type="text/javascript" src="Generic Object Sharing Protocol.html_files/marktree.js"> </script></head><body><div class="basetop"><a href="#" onclick="expandAll(document.getElementById('base'))">Expand</a> - <a href="#" onclick="collapseAll(document.getElementById('base'))">Collapse</a></div><div id="base" class="basetext"><ul><li class="col" style="" id="FMFreemind_Link_1069566441FM"><span style="font-size:167%;font-weight:bold;">Generic Object Sharing Protocol</span><ul class="subexp"><li class="exp" style="" id="FMFreemind_Link_1660540085FM"><span style="font-size:133%;font-weight:bold;">Hub Identification</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_780558731FM"><span style="">Every hub generates an id string by random</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1498010716FM"><span style="">This is the Hub-Id (Hub Identifier)</span></li><li class="basic" style="" id="FMFreemind_Link_458280781FM"><span style="">Only on first use</span></li><li class="basic" style="" id="FMFreemind_Link_698958541FM"><span style="">This should be globally unique</span></li><li class="basic" style="" id="FMFreemind_Link_1564511533FM"><span style="">It will be stored in hub's database for later reuse</span></li><li class="col" style="" id="FMFreemind_Link_982080681FM"><span style="">A hash is being generated of it</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_177707740FM"><span style="">Hashed data:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1317863864FM"><span style="">Hub's IP number and hostname</span></li><li class="basic" style="" id="FMFreemind_Link_1030355543FM"><span style="">Some random characters</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1022876700FM"><span style="">This id does not change as long as the database is not purged</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1712131488FM"><span style="">Per session another id is generated</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_439993942FM"><span style="">This is the SID (Session IDentifier)</span></li><li class="basic" style="" id="FMFreemind_Link_1215594894FM"><span style="">It is being distributed to the hubs</span></li><li class="col" style="" id="FMFreemind_Link_1633651159FM"><span style="">It stored together with the Hub-Id</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_651452439FM"><span style="">So other can validate bother together</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_789902518FM"><img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <span style="">Logging should only enabled for debugging purposes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_902328932FM"><span style="">Locking IPs or Hub-Ids on master-nodes is not planed</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1592412776FM"><span style="">Censorship would be to very easy</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_423578439FM"><span style="">Government agencies or enterprise parties</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_84092519FM"><span style="">Censhorship makes no sence here</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_514458550FM"><span style="">It can very easy be bypassed:</span></li><li class="col" style="" id="FMFreemind_Link_1221678941FM"><span style="">Delete Hub-Id in database</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_904836052FM"><span style="">A new one got generated</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1262635656FM"><span style="">Locked IP or port number can be bypassed by proxies</span></li><li class="col" style="" id="FMFreemind_Link_1619827292FM"><span style="">One or two master-hubs should listen on ports commonly unblocked by firewalls</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_709609072FM"><span style="">Like 80/443/110/25</span></li></ul></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_441713513FM"><span style="">Hubs can be optionally registered by master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1200999421FM"><span style="">Increases karma because the hub admin is verified</span></li><li class="basic" style="" id="FMFreemind_Link_1617168424FM"><span style="">Unregistered hubs does not receive negative votings</span></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1339348415FM"><span style="font-size:133%;font-weight:bold;">Bootstrapping</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_453620216FM"><span style="">At least one, better 3 to 4, master-nodes are required</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_265648584FM"><span style="">Aka. "Bootstrap-Nodes"</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_854375254FM"><span style="">Bootstrap-Nodes are working stand-alone</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_882684293FM"><span style="">No central "Super-Node" is required</span></li><li class="basic" style="" id="FMFreemind_Link_1661888163FM"><span style="">Too much traffic would have to flow through it</span></li><li class="basic" style="" id="FMFreemind_Link_1121780060FM"><span style="">Attacks on the network by censorship are reduced</span></li><li class="basic" style="" id="FMFreemind_Link_924004535FM"><span style="">Traffic does not increase network-overall load</span></li><li class="col" style="" id="FMFreemind_Link_1573570415FM"><span style="">Small disadvantage:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1018217993FM"><span style="">Hubs must register with ...</span></li><li class="basic" style="" id="FMFreemind_Link_665965725FM"><span style="">... more than one master-node ...</span></li><li class="basic" style="" id="FMFreemind_Link_1849172644FM"><span style="">.. or connect with each other</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_608191462FM"><span style="">Hub is fetching a list of other hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_195277951FM"><span style="">They must have at least X matching object types</span></li><li class="basic" style="" id="FMFreemind_Link_453619955FM"><span style="">Hashes of hub-lists should match</span></li><li class="col" style="" id="FMFreemind_Link_574241054FM"><span style="">If to much are inconsistent:</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1253336655FM"><span style="">No connect can happen</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1412643595FM"><span style="">Hub list is rejected</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1181650485FM"><span style="">Or the bootstrap-nodes are working as regular hubs</span></li><li class="basic" style="" id="FMFreemind_Link_1134140787FM"><span style="">Replication of the hub-list is required by all bootstrap-nodes</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FM_FM"><span style="font-size:133%;font-weight:bold;">Karma</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_1190748575FM"><span style="">Karma is given for validating entries in the DHT</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_29494292FM"><span style="">Last activity in near past</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_254202732FM"><span style="">Does not affect karma</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_210971136FM"><span style="">Returned pings</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1680521907FM"><span style="">Amount of sent pings</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_689172908FM"><span style="">If no reply it got dead-listed</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_612939095FM"><span style="">Failed pings reduce karma</span></li><li class="basic" style="" id="FMFreemind_Link_45314722FM"><span style="">Slow responses reduce karma</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_538248067FM"><span style="">Karma voting for other hubs is not to negative</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_511404921FM"><span style="">Reduces manipulation chances</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_801930369FM"><span style="">Prefer karma votes of trusted hubs</span></li><li class="basic" style="" id="FMFreemind_Link_45612508FM"><span style="">Negative karma votings for untrusted karma reduce own karma</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1507410448FM"><span style="">To much "spam packages" reduce karma</span></li><li class="basic" style="" id="FMFreemind_Link_993155795FM"><span style="">Validated packages increase karma</span></li><li class="col" style="" id="FMFreemind_Link_1606666417FM"><span style="">Protocol version should not be to old</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1094995324FM"><span style="">This affects karma only negativly</span></li><li class="basic" style="" id="FMFreemind_Link_344926416FM"><span style="">An up-to-date protocol does not increase karma</span></li><li class="basic" style="" id="FMFreemind_Link_473648942FM"><span style="">Does also serve as a "spam protection"</span></li><li class="col" style="" id="FMFreemind_Link_594554525FM"><span style="">Received protocol version of hub is older than stored</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_174968672FM"><span style="">Karma is reduced</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1682037492FM"><span style="">Received protocol version is much than from master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1255846244FM"><span style="">Karma is reduced</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_1260923814FM"><span style="">Provided object types by the peer hub</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1973981672FM"><span style="">This affectes karma only negativly</span></li><li class="basic" style="" id="FMFreemind_Link_936683200FM"><span style="">New types must first be known by masters</span></li><li class="col" style="" id="FMFreemind_Link_965874760FM"><span style="">This should be configurable:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1804987507FM"><span style="">Karma should be reduced...</span></li><li class="basic" style="" id="FMFreemind_Link_1719378455FM"><span style="">... or peer hub should be black-listed</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1318639621FM"><span style="">Because of every node can be a master-mode censorship is really hard</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1158753702FM"><span style="">Correctly logging</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_571936771FM"><span style="">Does not affect karma</span></li><li class="col" style="" id="FMFreemind_Link_526838799FM"><span style="">Logout must be done by master hub and active hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_961650790FM"><img src="Generic Object Sharing Protocol.html_files/icons/idea.png" alt="idea"/> <span style="">"Bye" message</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_548852073FM"><span style="">Rotating of dynamic IPs should be considered</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1811539187FM"><span style="">Must be registered by master-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_589306378FM"><span style="">ID is registered as "Dynamic IP"</span></li><li class="basic" style="" id="FMFreemind_Link_1377338623FM"><span style="">So connects are still possible</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1985410220FM"><span style="">No negative votings by other hubs</span></li><li class="col" style="" id="FMFreemind_Link_289837552FM"><span style="">Current IP does spread good in network</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_962702337FM"><span style="">Query of the master-node only in doubt</span></li></ul></li></ul></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_831929021FM"><span style="font-size:133%;font-weight:bold;">Update Messages</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_71881649FM"><span style="">Will only be broadcasted from bootstrap- to master- and list-nodes</span></li><li class="col" style="" id="FMFreemind_Link_774046685FM"><span style="">No hub will receive update messages due to heavy network load</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1204404067FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/help.png" alt="help"/> <span style="">Maybe only "good" hubs should receive this?</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1584525818FM"><span style="">Contains update notes and importance level</span></li></ul></li><li class="exp" style="" id="FMFreemind_Link_168475853FM"><span style="font-size:133%;font-weight:bold;">"Client" Connections</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_1154203316FM"><img src="Generic Object Sharing Protocol.html_files/icons/bell.png" alt="bell"/> <span style="">Should be interpreted as "application software"</span></li><li class="col" style="" id="FMFreemind_Link_1741675827FM"><span style="">Clients should also generate a "client id"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_518254369FM"><span style="">Both id and sid</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_815708604FM"><span style="">Will also connect first to bootstrap-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_934296740FM"><span style="">Ask for a hub-list as well</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_480673349FM"><span style="">Do also receive karma from hubs</span></li><li class="basic" style="" id="FMFreemind_Link_692612491FM"><span style="">Dynamic IPs are also accepted and therefore must be registered</span></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1445979240FM"><span style="font-size:133%;font-weight:bold;">Client<->Hub Communication</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_374257888FM"><span style="">After a client has bootstrapped it announces all it's object types to the hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1014689893FM"><span style="">Including acceptance of broadcasts, poll-mode and Ping-POST</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_730901168FM"><span style="">By this the hubs know clients and their accepted object types</span></li><li class="col" style="" id="FMFreemind_Link_1981646811FM"><span style="">Clients may download a hub-list for a specific object type</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_376278255FM"><span style="">Distinct-List-Mode</span></li><li class="basic" style="" id="FMFreemind_Link_481362981FM"><span style="">After selecting a hub the client can request a list of clients from that hub</span></li><li class="col" style="" id="FMFreemind_Link_1444901526FM"><span style="">From these clients the client can accept objects from and send to</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_423939808FM"><span style="">E.g. news by broadcast</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_619530506FM"><span style="">Clients may send "broadcast" objects</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_104270656FM"><span style="">Broadcast-Mode</span></li><li class="col" style="" id="FMFreemind_Link_187831566FM"><span style="">Must be allowed by hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_929863047FM"><span style="">This consumes traffic</span></li><li class="basic" style="" id="FMFreemind_Link_421479503FM"><span style="">Acceptance of broadcasts is known to list-/master- and bootstrap-nodes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_20289741FM"><span style="">A client sends its broadcast to the master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_751901694FM"><span style="">They are distribute it to their fellow hubs</span></li><li class="basic" style="" id="FMFreemind_Link_908440118FM"><span style="">A hub knows which client accepts broadcasts and "deposits" it for the client</span></li><li class="col" style="" id="FMFreemind_Link_1381761729FM"><span style="">Clients are requesting such broadcasts by poll-mode or are "pinged"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_816499858FM"><span style="">In poll-mode the client asks on a regular basis at the hub for new broadcasts</span></li><li class="col" style="" id="FMFreemind_Link_1452667491FM"><span style="">A Ping-POST is being sent by the hub as a regular HTTP-POST request to the client</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_873242294FM"><span style="">This also happens on a regular basis</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1845481591FM"><span style="">A hub-admin may allow both types independly</span></li><li class="col" style="" id="FMFreemind_Link_1607423256FM"><span style="">If none is allowed the hub acts as a "relay"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_297001287FM"><span style="">And therefore it cannot accept clients with broadcast-functionality enabled</span></li></ul></li></ul></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_144167856FM"><span style="font-size:117%;font-weight:bold;">Client-Client Communication</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1642758810FM"><span style="">May be done "anonymously" over the hub or directly with an other client</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1507061819FM"><span style="">Communication of the hub is done in poll-mode or by Ping-POST</span></li><li class="basic" style="" id="FMFreemind_Link_1390010744FM"><span style="">Direct client-client communication client "A" sends a Ping-POST directly to client "B"</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1445364933FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/desktop_new.png" alt="desktop_new"/> <span style="">Wrongly sent Ping-POSTs (e.g. the admin doesn't allow them) may be answered with a regular HTTP status '4XX'</span></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_329480665FM"><span style="font-size:133%;font-weight:bold;">Usage of low-level protocols</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_679379315FM"><span style="">Already existing low-level protocols like TCP/IP and UDP should be used</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1616250831FM"><span style="">TCP should be used for "inter-communication"</span></li><li class="col" style="" id="FMFreemind_Link_898295556FM"><span style="">UDP should be used for "streaming" the objects to other hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_401089184FM"><span style="">Parties are generating hashes of chunks for validation</span></li><li class="col" style="" id="FMFreemind_Link_947570234FM"><span style="">Chunks should only be created for very big objects</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_912553641FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <span style="">Total object size is larger than X KByte</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1011335691FM"><span style="">The sender creates hashes and adds them to the chunk</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_64829706FM"><span style="">The receivers validates them</span></li><li class="basic" style="" id="FMFreemind_Link_1875786790FM"><span style="">No serial numbers a-la TCP are generated</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_99186455FM"><span style="">The last chunk package contains both hashes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_398290140FM"><span style="">Hash of itself and the final hash</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1741640397FM"><span style="">If a hash fails to validate it is being collected</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1930312770FM"><span style="">After the final chunk was sent, failed chunks a re-requested</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_681298548FM"><span style="">This is retried X times per hash</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1530992232FM"><span style="">But always at the end of the whole transaction and all together</span></li><li class="col" style="" id="FMFreemind_Link_766714583FM"><span style="">If still some hashes failed to transfer</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1262238289FM"><span style="">The object got dropped or fully requested</span></li><li class="basic" style="" id="FMFreemind_Link_1316903827FM"><span style="">This should be configurable by the admin</span></li><li class="col" style="" id="FMFreemind_Link_525157850FM"><span style="">To do so, the final hash and object type is submitted to the sender</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1316680608FM"><img src="Generic Object Sharing Protocol.html_files/icons/attach.png" alt="attach"/> <span style="">"Restransmit-Message"</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_9873596FM"><span style="">The sender is now trying smaller chunks</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_507679569FM"><span style="">If all was successfully received</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_566458700FM"><span style="">The receivers sends a "done-message" to the sender with final hash and object type</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_602435860FM"><span style="">There is also a "real" streaming mode</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1387836906FM"><span style="">This is e.g. used for chat</span></li><li class="basic" style="" id="FMFreemind_Link_1268993772FM"><span style="">For this TCP/IP is used and no hashes are generated</span></li><li class="basic" style="" id="FMFreemind_Link_602177505FM"><span style="">Also no chunks are generated</span></li><li class="basic" style="" id="FMFreemind_Link_191938147FM"><span style="">Only in this mode "multi-casting" is possible</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1372827895FM"><span style="font-size:133%;font-weight:bold;">Fault Tolerance / Reliability</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_28699698FM"><span style="">After X failed connection attempts a hub got removed</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1795377892FM"><span style="">Other hubs report this to the master-node</span></li><li class="basic" style="" id="FMFreemind_Link_1595372369FM"><span style="">The master-node probes the failed hub and removes it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_468909888FM"><span style="">Failed list-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_192209809FM"><span style="">Hubs are reporting it to the master-node</span></li><li class="basic" style="" id="FMFreemind_Link_933570791FM"><span style="">The master-node probes the failed list-node and removes it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1309357086FM"><span style="">Failed master-node</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1228535079FM"><span style="">List-nodes takeover the role of a master-node if no bootstrap-nodes are available</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1324885722FM"><img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <img src="Generic Object Sharing Protocol.html_files/icons/desktop_new.png" alt="desktop_new"/> <span style="">This takeover should not be entirely and should be defined</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_489546245FM"><span style="">If there is no list-node, hubs look for an active master-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_496844314FM"><span style="">They report the failed master-node to it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1831877789FM"><span style="">If additionally no master-node is up, a hub will be elected as new master-node</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1473765417FM"><span style="">Doing so, all hubs are identifying the hub with...</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1849074808FM"><span style="">... the best karma</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1303674032FM"><span style="">This is known to many hubs</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1087780155FM"><span style="">... most votings</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_585981486FM"><span style="">A "vote" is a positive karma</span></li><li class="basic" style="" id="FMFreemind_Link_616335445FM"><span style="">Also known to many hubs</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_341438028FM"><span style="">The "election" should take place within a specific timeout</span></li><li class="basic" style="" id="FMFreemind_Link_515853064FM"><span style="">If no election is happening the hub with most connections got elected</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_694830716FM"><span style="">If one of the bootstrap-nodes is up</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1701914366FM"><span style="">The elected hubs notifies a some of it's fellow hubs that the bootstrap-node is back</span></li><li class="basic" style="" id="FMFreemind_Link_561336762FM"><span style="">The elected hub becomes a regular hub and notifies other hubs on connection attempts</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1745751398FM"><span style="">Disadvantages:</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1189063074FM"><span style="">A new hub with only knowlege about the bootstrap-nodes may not be able to connect to the hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1581407665FM"><span style="">Additional bootstrap-nodes on other server and/or continent may help here</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1204819150FM"><span style="font-size:133%;font-weight:bold;">Object Types</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_1961919735FM"><span style="">New object types are only addable by updating the software</span></li><li class="col" style="" id="FMFreemind_Link_188591190FM"><span style="">It also possible by 3rd-party</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_385578906FM"><span style="">Must be known by master/bootstrap-nodes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1667260565FM"><span style="">Outdated object types are marked "deprecated" for a longer time</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1936301650FM"><span style="">Master-nodes may accept or reject them</span></li><li class="basic" style="" id="FMFreemind_Link_505959038FM"><span style="">A "deprecation message" is always being sent</span></li><li class="basic" style="" id="FMFreemind_Link_1001362763FM"><span style="">A note of a required update can optionally be added</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_259217829FM"><span style="">After deprecation time they are treated as "unknown"</span></li><li class="col" style="" id="FMFreemind_Link_1228871005FM"><span style="">Other hubs should ask bootstrap-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_887331476FM"><span style="">This compensate errors made by master-nodes</span></li><li class="basic" style="" id="FMFreemind_Link_1450229897FM"><span style="">Wrongly deprecated object types by the master-node result in bad karma by the bootstrap-node</span></li></ul></li></ul></li></ul></li></ul></div></body></html>
\ No newline at end of file
+<html xml:lang="fi" xmlns="http://www.w3.org/1999/xhtml"><head><title>Generic Object
-Sharing Protocol</title><link rel="stylesheet" href="Generic Object Sharing Protocol.html_files/treestyles.css" type="text/css"/><script type="text/javascript" src="Generic Object Sharing Protocol.html_files/marktree.js"> </script></head><body><div class="basetop"><a href="#" onclick="expandAll(document.getElementById('base'))">Expand</a> - <a href="#" onclick="collapseAll(document.getElementById('base'))">Collapse</a></div><div id="base" class="basetext"><ul><li class="col" style="" id="FMFreemind_Link_1069566441FM"><span style="font-size:167%;font-weight:bold;">Generic Object-Sharing Protocol</span><ul class="subexp"><li class="exp" style="" id="FMFreemind_Link_1660540085FM"><span style="font-size:133%;font-weight:bold;">Hub Identification</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_780558731FM"><span style="">Every hub generates an id string by random</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1498010716FM"><span style="">This is the Hub-Id (Hub Identifier)</span></li><li class="basic" style="" id="FMFreemind_Link_458280781FM"><span style="">Only on first use</span></li><li class="basic" style="" id="FMFreemind_Link_698958541FM"><span style="">This should be globally unique</span></li><li class="basic" style="" id="FMFreemind_Link_1564511533FM"><span style="">It will be stored in hub's database for later reuse</span></li><li class="col" style="" id="FMFreemind_Link_982080681FM"><span style="">A hash is being generated of it</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_177707740FM"><span style="">Hashed data:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1317863864FM"><span style="">Hub's IP number and hostname</span></li><li class="basic" style="" id="FMFreemind_Link_1030355543FM"><span style="">Some random characters</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1022876700FM"><span style="">This id does not change as long as the database is not purged</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1712131488FM"><span style="">Per session another id is generated</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_439993942FM"><span style="">This is the SID (Session IDentifier)</span></li><li class="basic" style="" id="FMFreemind_Link_1215594894FM"><span style="">It is being distributed to the hubs</span></li><li class="col" style="" id="FMFreemind_Link_1633651159FM"><span style="">It stored together with the Hub-Id</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_651452439FM"><span style="">So other can validate bother together</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_789902518FM"><img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <span style="">Logging should only enabled for debugging purposes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_902328932FM"><span style="">Locking IPs or Hub-Ids on master-nodes is not planed</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1592412776FM"><span style="">Censorship would be to very easy</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_423578439FM"><span style="">Government agencies or enterprise parties</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_84092519FM"><span style="">Censhorship makes no sence here</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_514458550FM"><span style="">It can very easy be bypassed:</span></li><li class="col" style="" id="FMFreemind_Link_1221678941FM"><span style="">Delete Hub-Id in database</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_904836052FM"><span style="">A new one got generated</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1262635656FM"><span style="">Locked IP or port number can be bypassed by proxies</span></li><li class="col" style="" id="FMFreemind_Link_1619827292FM"><span style="">One or two master-hubs should listen on ports commonly unblocked by firewalls</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_709609072FM"><span style="">Like 80/443/110/25</span></li></ul></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_441713513FM"><span style="">Hubs can be optionally registered by master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1200999421FM"><span style="">Increases karma because the hub admin is verified</span></li><li class="basic" style="" id="FMFreemind_Link_1617168424FM"><span style="">Unregistered hubs does not receive negative votings</span></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1339348415FM"><span style="font-size:133%;font-weight:bold;">Bootstrapping</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_453620216FM"><span style="">At least one, better 3 to 4, master-nodes are required</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_265648584FM"><span style="">Aka. "Bootstrap-Nodes"</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_854375254FM"><span style="">Bootstrap-Nodes are working stand-alone</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_882684293FM"><span style="">No central "Super-Node" is required</span></li><li class="basic" style="" id="FMFreemind_Link_1661888163FM"><span style="">Too much traffic would have to flow through it</span></li><li class="basic" style="" id="FMFreemind_Link_1121780060FM"><span style="">Attacks on the network by censorship are reduced</span></li><li class="basic" style="" id="FMFreemind_Link_924004535FM"><span style="">Traffic does not increase network-overall load</span></li><li class="col" style="" id="FMFreemind_Link_1573570415FM"><span style="">Small disadvantage:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1018217993FM"><span style="">Hubs must register with ...</span></li><li class="basic" style="" id="FMFreemind_Link_665965725FM"><span style="">... more than one master-node ...</span></li><li class="basic" style="" id="FMFreemind_Link_1849172644FM"><span style="">.. or connect with each other</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_608191462FM"><span style="">Hub is fetching a list of other hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_195277951FM"><span style="">They must have at least X matching object types</span></li><li class="basic" style="" id="FMFreemind_Link_453619955FM"><span style="">Hashes of hub-lists should match</span></li><li class="col" style="" id="FMFreemind_Link_574241054FM"><span style="">If to much are inconsistent:</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1253336655FM"><span style="">No connect can happen</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1412643595FM"><span style="">Hub list is rejected</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1181650485FM"><span style="">Or the bootstrap-nodes are working as regular hubs</span></li><li class="basic" style="" id="FMFreemind_Link_1134140787FM"><span style="">Replication of the hub-list is required by all bootstrap-nodes</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FM_FM"><span style="font-size:133%;font-weight:bold;">Karma</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_1190748575FM"><span style="">Karma is given for validating entries in the DHT</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_29494292FM"><span style="">Last activity in near past</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_254202732FM"><span style="">Does not affect karma</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_210971136FM"><span style="">Returned pings</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1680521907FM"><span style="">Amount of sent pings</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_689172908FM"><span style="">If no reply it got dead-listed</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_612939095FM"><span style="">Failed pings reduce karma</span></li><li class="basic" style="" id="FMFreemind_Link_45314722FM"><span style="">Slow responses reduce karma</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_538248067FM"><span style="">Karma voting for other hubs is not to negative</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_511404921FM"><span style="">Reduces manipulation chances</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_801930369FM"><span style="">Prefer karma votes of trusted hubs</span></li><li class="basic" style="" id="FMFreemind_Link_45612508FM"><span style="">Negative karma votings for untrusted karma reduce own karma</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1507410448FM"><span style="">To much "spam packages" reduce karma</span></li><li class="basic" style="" id="FMFreemind_Link_993155795FM"><span style="">Validated packages increase karma</span></li><li class="col" style="" id="FMFreemind_Link_1606666417FM"><span style="">Protocol version should not be to old</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1094995324FM"><span style="">This affects karma only negativly</span></li><li class="basic" style="" id="FMFreemind_Link_344926416FM"><span style="">An up-to-date protocol does not increase karma</span></li><li class="basic" style="" id="FMFreemind_Link_473648942FM"><span style="">Does also serve as a "spam protection"</span></li><li class="col" style="" id="FMFreemind_Link_594554525FM"><span style="">Received protocol version of hub is older than stored</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_174968672FM"><span style="">Karma is reduced</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1682037492FM"><span style="">Received protocol version is much than from master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1255846244FM"><span style="">Karma is reduced</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_1260923814FM"><span style="">Provided object types by the peer hub</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1973981672FM"><span style="">This affectes karma only negativly</span></li><li class="basic" style="" id="FMFreemind_Link_936683200FM"><span style="">New types must first be known by masters</span></li><li class="col" style="" id="FMFreemind_Link_965874760FM"><span style="">This should be configurable:</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1804987507FM"><span style="">Karma should be reduced...</span></li><li class="basic" style="" id="FMFreemind_Link_1719378455FM"><span style="">... or peer hub should be black-listed</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1318639621FM"><span style="">Because of every node can be a master-mode censorship is really hard</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1158753702FM"><span style="">Correctly logging</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_571936771FM"><span style="">Does not affect karma</span></li><li class="col" style="" id="FMFreemind_Link_526838799FM"><span style="">Logout must be done by master hub and active hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_961650790FM"><img src="Generic Object Sharing Protocol.html_files/icons/idea.png" alt="idea"/> <span style="">"Bye" message</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_548852073FM"><span style="">Rotating of dynamic IPs should be considered</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1811539187FM"><span style="">Must be registered by master-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_589306378FM"><span style="">ID is registered as "Dynamic IP"</span></li><li class="basic" style="" id="FMFreemind_Link_1377338623FM"><span style="">So connects are still possible</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1985410220FM"><span style="">No negative votings by other hubs</span></li><li class="col" style="" id="FMFreemind_Link_289837552FM"><span style="">Current IP does spread good in network</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_962702337FM"><span style="">Query of the master-node only in doubt</span></li></ul></li></ul></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_831929021FM"><span style="font-size:133%;font-weight:bold;">Update Messages</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_71881649FM"><span style="">Will only be broadcasted from bootstrap- to master- and list-nodes</span></li><li class="col" style="" id="FMFreemind_Link_774046685FM"><span style="">No hub will receive update messages due to heavy network load</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1204404067FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/help.png" alt="help"/> <span style="">Maybe only "good" hubs should receive this?</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1584525818FM"><span style="">Contains update notes and importance level</span></li></ul></li><li class="exp" style="" id="FMFreemind_Link_168475853FM"><span style="font-size:133%;font-weight:bold;">"Client" Connections</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_1154203316FM"><img src="Generic Object Sharing Protocol.html_files/icons/bell.png" alt="bell"/> <span style="">Should be interpreted as "application software"</span></li><li class="col" style="" id="FMFreemind_Link_1741675827FM"><span style="">Clients should also generate a "client id"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_518254369FM"><span style="">Both id and sid</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_815708604FM"><span style="">Will also connect first to bootstrap-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_934296740FM"><span style="">Ask for a hub-list as well</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_480673349FM"><span style="">Do also receive karma from hubs</span></li><li class="basic" style="" id="FMFreemind_Link_692612491FM"><span style="">Dynamic IPs are also accepted and therefore must be registered</span></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1445979240FM"><span style="font-size:133%;font-weight:bold;">Client<->Hub Communication</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_374257888FM"><span style="">After a client has bootstrapped it announces all it's object types to the hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1014689893FM"><span style="">Including acceptance of broadcasts, poll-mode and Ping-POST</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_730901168FM"><span style="">By this the hubs know clients and their accepted object types</span></li><li class="col" style="" id="FMFreemind_Link_1981646811FM"><span style="">Clients may download a hub-list for a specific object type</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_376278255FM"><span style="">Distinct-List-Mode</span></li><li class="basic" style="" id="FMFreemind_Link_481362981FM"><span style="">After selecting a hub the client can request a list of clients from that hub</span></li><li class="col" style="" id="FMFreemind_Link_1444901526FM"><span style="">From these clients the client can accept objects from and send to</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_423939808FM"><span style="">E.g. news by broadcast</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_619530506FM"><span style="">Clients may send "broadcast" objects</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_104270656FM"><span style="">Broadcast-Mode</span></li><li class="col" style="" id="FMFreemind_Link_187831566FM"><span style="">Must be allowed by hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_929863047FM"><span style="">This consumes traffic</span></li><li class="basic" style="" id="FMFreemind_Link_421479503FM"><span style="">Acceptance of broadcasts is known to list-/master- and bootstrap-nodes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_20289741FM"><span style="">A client sends its broadcast to the master-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_751901694FM"><span style="">They are distribute it to their fellow hubs</span></li><li class="basic" style="" id="FMFreemind_Link_908440118FM"><span style="">A hub knows which client accepts broadcasts and "deposits" it for the client</span></li><li class="col" style="" id="FMFreemind_Link_1381761729FM"><span style="">Clients are requesting such broadcasts by poll-mode or are "pinged"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_816499858FM"><span style="">In poll-mode the client asks on a regular basis at the hub for new broadcasts</span></li><li class="col" style="" id="FMFreemind_Link_1452667491FM"><span style="">A Ping-POST is being sent by the hub as a regular HTTP-POST request to the client</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_873242294FM"><span style="">This also happens on a regular basis</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1845481591FM"><span style="">A hub-admin may allow both types independly</span></li><li class="col" style="" id="FMFreemind_Link_1607423256FM"><span style="">If none is allowed the hub acts as a "relay"</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_297001287FM"><span style="">And therefore it cannot accept clients with broadcast-functionality enabled</span></li></ul></li></ul></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_144167856FM"><span style="font-size:117%;font-weight:bold;">Client-Client Communication</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1642758810FM"><span style="">May be done "anonymously" over the hub or directly with an other client</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1507061819FM"><span style="">Communication of the hub is done in poll-mode or by Ping-POST</span></li><li class="basic" style="" id="FMFreemind_Link_1390010744FM"><span style="">Direct client-client communication client "A" sends a Ping-POST directly to client "B"</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_1445364933FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/desktop_new.png" alt="desktop_new"/> <span style="">Wrongly sent Ping-POSTs (e.g. the admin doesn't allow them) may be answered with a regular HTTP status '4XX'</span></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_329480665FM"><span style="font-size:133%;font-weight:bold;">Usage of low-level protocols</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_679379315FM"><span style="">Already existing low-level protocols like TCP/IP and UDP should be used</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1616250831FM"><span style="">TCP should be used for "inter-communication"</span></li><li class="col" style="" id="FMFreemind_Link_898295556FM"><span style="">UDP should be used for "streaming" the objects to other hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_401089184FM"><span style="">Parties are generating hashes of chunks for validation</span></li><li class="col" style="" id="FMFreemind_Link_947570234FM"><span style="">Chunks should only be created for very big objects</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_912553641FM"><img src="Generic Object Sharing Protocol.html_files/icons/xmag.png" alt="xmag"/> <img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <span style="">Total object size is larger than X KByte</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1011335691FM"><span style="">The sender creates hashes and adds them to the chunk</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_64829706FM"><span style="">The receivers validates them</span></li><li class="basic" style="" id="FMFreemind_Link_1875786790FM"><span style="">No serial numbers a-la TCP are generated</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_99186455FM"><span style="">The last chunk package contains both hashes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_398290140FM"><span style="">Hash of itself and the final hash</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1741640397FM"><span style="">If a hash fails to validate it is being collected</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1930312770FM"><span style="">After the final chunk was sent, failed chunks a re-requested</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_681298548FM"><span style="">This is retried X times per hash</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1530992232FM"><span style="">But always at the end of the whole transaction and all together</span></li><li class="col" style="" id="FMFreemind_Link_766714583FM"><span style="">If still some hashes failed to transfer</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1262238289FM"><span style="">The object got dropped or fully requested</span></li><li class="basic" style="" id="FMFreemind_Link_1316903827FM"><span style="">This should be configurable by the admin</span></li><li class="col" style="" id="FMFreemind_Link_525157850FM"><span style="">To do so, the final hash and object type is submitted to the sender</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1316680608FM"><img src="Generic Object Sharing Protocol.html_files/icons/attach.png" alt="attach"/> <span style="">"Restransmit-Message"</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_9873596FM"><span style="">The sender is now trying smaller chunks</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_507679569FM"><span style="">If all was successfully received</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_566458700FM"><span style="">The receivers sends a "done-message" to the sender with final hash and object type</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_602435860FM"><span style="">There is also a "real" streaming mode</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1387836906FM"><span style="">This is e.g. used for chat</span></li><li class="basic" style="" id="FMFreemind_Link_1268993772FM"><span style="">For this TCP/IP is used and no hashes are generated</span></li><li class="basic" style="" id="FMFreemind_Link_602177505FM"><span style="">Also no chunks are generated</span></li><li class="basic" style="" id="FMFreemind_Link_191938147FM"><span style="">Only in this mode "multi-casting" is possible</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1372827895FM"><span style="font-size:133%;font-weight:bold;">Fault Tolerance / Reliability</span><ul class="sub"><li class="col" style="" id="FMFreemind_Link_28699698FM"><span style="">After X failed connection attempts a hub got removed</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1795377892FM"><span style="">Other hubs report this to the master-node</span></li><li class="basic" style="" id="FMFreemind_Link_1595372369FM"><span style="">The master-node probes the failed hub and removes it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_468909888FM"><span style="">Failed list-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_192209809FM"><span style="">Hubs are reporting it to the master-node</span></li><li class="basic" style="" id="FMFreemind_Link_933570791FM"><span style="">The master-node probes the failed list-node and removes it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1309357086FM"><span style="">Failed master-node</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1228535079FM"><span style="">List-nodes takeover the role of a master-node if no bootstrap-nodes are available</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1324885722FM"><img src="Generic Object Sharing Protocol.html_files/icons/messagebox_warning.png" alt="messagebox_warning"/> <img src="Generic Object Sharing Protocol.html_files/icons/desktop_new.png" alt="desktop_new"/> <span style="">This takeover should not be entirely and should be defined</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_489546245FM"><span style="">If there is no list-node, hubs look for an active master-node</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_496844314FM"><span style="">They report the failed master-node to it</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1831877789FM"><span style="">If additionally no master-node is up, a hub will be elected as new master-node</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1473765417FM"><span style="">Doing so, all hubs are identifying the hub with...</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1849074808FM"><span style="">... the best karma</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1303674032FM"><span style="">This is known to many hubs</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1087780155FM"><span style="">... most votings</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_585981486FM"><span style="">A "vote" is a positive karma</span></li><li class="basic" style="" id="FMFreemind_Link_616335445FM"><span style="">Also known to many hubs</span></li></ul></li></ul></li><li class="basic" style="" id="FMFreemind_Link_341438028FM"><span style="">The "election" should take place within a specific timeout</span></li><li class="basic" style="" id="FMFreemind_Link_515853064FM"><span style="">If no election is happening the hub with most connections got elected</span></li></ul></li></ul></li><li class="col" style="" id="FMFreemind_Link_694830716FM"><span style="">If one of the bootstrap-nodes is up</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1701914366FM"><span style="">The elected hubs notifies a some of it's fellow hubs that the bootstrap-node is back</span></li><li class="basic" style="" id="FMFreemind_Link_561336762FM"><span style="">The elected hub becomes a regular hub and notifies other hubs on connection attempts</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1745751398FM"><span style="">Disadvantages:</span><ul class="subexp"><li class="col" style="" id="FMFreemind_Link_1189063074FM"><span style="">A new hub with only knowlege about the bootstrap-nodes may not be able to connect to the hubs</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1581407665FM"><span style="">Additional bootstrap-nodes on other server and/or continent may help here</span></li></ul></li></ul></li></ul></li><li class="exp" style="" id="FMFreemind_Link_1204819150FM"><span style="font-size:133%;font-weight:bold;">Object Types</span><ul class="sub"><li class="basic" style="" id="FMFreemind_Link_1961919735FM"><span style="">New object types are only addable by updating the software</span></li><li class="col" style="" id="FMFreemind_Link_188591190FM"><span style="">It also possible by 3rd-party</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_385578906FM"><span style="">Must be known by master/bootstrap-nodes</span></li></ul></li><li class="col" style="" id="FMFreemind_Link_1667260565FM"><span style="">Outdated object types are marked "deprecated" for a longer time</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_1936301650FM"><span style="">Master-nodes may accept or reject them</span></li><li class="basic" style="" id="FMFreemind_Link_505959038FM"><span style="">A "deprecation message" is always being sent</span></li><li class="basic" style="" id="FMFreemind_Link_1001362763FM"><span style="">A note of a required update can optionally be added</span></li></ul></li><li class="basic" style="" id="FMFreemind_Link_259217829FM"><span style="">After deprecation time they are treated as "unknown"</span></li><li class="col" style="" id="FMFreemind_Link_1228871005FM"><span style="">Other hubs should ask bootstrap-nodes</span><ul class="subexp"><li class="basic" style="" id="FMFreemind_Link_887331476FM"><span style="">This compensate errors made by master-nodes</span></li><li class="basic" style="" id="FMFreemind_Link_1450229897FM"><span style="">Wrongly deprecated object types by the master-node result in bad karma by the bootstrap-node</span></li></ul></li></ul></li></ul></li></ul></div></body></html>
\ No newline at end of file
<map version="0.8.1">
<!-- To view this file, download free mind mapping software FreeMind from http://freemind.sourceforge.net -->
-<node CREATED="1236122299751" ID="Freemind_Link_1069566441" MODIFIED="1236899601270" TEXT="Generic Object Sharing Protocol">
+<node CREATED="1236122299751" ID="Freemind_Link_1069566441" MODIFIED="1236902424887" TEXT="Generic Object-Sharing Protocol">
<font BOLD="true" NAME="Dialog" SIZE="20"/>
<node CREATED="1236123417491" FOLDED="true" ID="Freemind_Link_1660540085" MODIFIED="1236899597347" POSITION="right" TEXT="Hub Identification">
<font BOLD="true" NAME="Dialog" SIZE="16"/>
projects / hub-docs.git / commitdiff