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diff --git a/docs/architecture.md b/docs/architecture.md new file mode 100644 index 0000000000..0c7f315f3f --- /dev/null +++ b/docs/architecture.md @@ -0,0 +1,65 @@ +# Synapse Architecture + +As of the end of Oct 2014, Synapse's overall architecture looks like: + + synapse + .-----------------------------------------------------. + | Notifier | + | ^ | | + | | | | + | .------------|------. | + | | handlers/ | | | + | | v | | + | | Event*Handler <--------> rest/* <=> Client + | | Rooms*Handler | | + HS <=> 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. |