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diff --git a/docs/implementation-notes/architecture.rst b/docs/implementation-notes/architecture.rst new file mode 100644 index 0000000000..b447858202 --- /dev/null +++ b/docs/implementation-notes/architecture.rst @@ -0,0 +1,65 @@ +Synapse Architecture +==================== + +As of the end of Oct 2014, Synapse's overall architecture looks like:: + + Notifier + ^ | + | | + .------------|------. + | handlers/ | | + | v | + | Event*Handler<---------> rest/* <=> Client + | Rooms*Handler | + HSes <=> federation/* <==> FederationHandler | + | | PresenceHandler | + | | TypingHandler | + | '-------------------' + | | | + | state/* | + | | | + | v v + `--------------> storage/* + | + v + .----. + | DB | + '----' + +* Handlers: business logic of synapse itself. Follows a set contract of BaseHandler: + + * BaseHandler gives us onNewRoomEvent which: (TODO: flesh this out and make it less cryptic): + + * handle_state(event) + * auth(event) + * persist_event(event) + * notify notifier or federation(event) + + * PresenceHandler: use distributor to get EDUs out of Federation. Very + lightweight logic built on the distributor + * TypingHandler: use distributor to get EDUs out of Federation. Very + lightweight logic built on the distributor + * EventsHandler: handles the events stream... + * FederationHandler: - gets PDU from Federation Layer; turns into an event; + follows basehandler functionality. + * RoomsHandler: does all the room logic, including members - lots of classes in + RoomsHandler. + * ProfileHandler: talks to the storage to store/retrieve profile info. + +* EventFactory: generates events of particular event types. +* Notifier: Backs the events handler +* REST: Interfaces handlers and events to the outside world via HTTP/JSON. + Converts events back and forth from JSON. +* Federation: holds the HTTP client & server to talk to other servers. Does + replication to make sure there's nothing missing in the graph. Handles + reliability. Handles txns. +* Distributor: generic event bus. used for presence & typing only currently. + Notifier could be implemented using Distributor - so far we are only using for + things which actually /require/ dynamic pluggability however as it can + obfuscate the actual flow of control. +* Auth: helper singleton to say whether a given event is allowed to do a given + thing (TODO: put this on the diagram) +* State: helper singleton: does state conflict resolution. You give it an event + and it tells you if it actually updates the state or not, and annotates the + event up properly and handles merge conflict resolution. +* Storage: abstracts the storage engine. |