2014-11-10 21:43:16 +03:00
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Synapse Architecture
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====================
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As of the end of Oct 2014, Synapse's overall architecture looks like::
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2014-11-11 00:56:52 +03:00
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synapse
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.-----------------------------------------------------.
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| Notifier |
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| ^ | |
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| .------------|------. |
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| | handlers/ | | |
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| | v | |
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2014-11-11 07:35:16 +03:00
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| | Event*Handler <--------> rest/* <=> Client
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2014-11-11 00:56:52 +03:00
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| | Rooms*Handler | |
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HSes <=> federation/* <==> FederationHandler | |
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| | | PresenceHandler | |
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| | | TypingHandler | |
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| | '-------------------' |
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| | state/* | |
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| | v v |
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| `--------------> storage/* |
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'--------------------------|--------------------------'
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2014-11-10 21:43:16 +03:00
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v
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.----.
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| DB |
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'----'
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* Handlers: business logic of synapse itself. Follows a set contract of BaseHandler:
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2014-11-11 01:07:08 +03:00
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- BaseHandler gives us onNewRoomEvent which: (TODO: flesh this out and make it less cryptic):
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2014-11-10 21:43:16 +03:00
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2014-11-11 01:07:08 +03:00
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+ handle_state(event)
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+ auth(event)
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+ persist_event(event)
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+ notify notifier or federation(event)
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2014-11-10 21:43:16 +03:00
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2014-11-11 01:07:08 +03:00
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- PresenceHandler: use distributor to get EDUs out of Federation. Very
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lightweight logic built on the distributor
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- TypingHandler: use distributor to get EDUs out of Federation. Very
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lightweight logic built on the distributor
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- EventsHandler: handles the events stream...
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- FederationHandler: - gets PDU from Federation Layer; turns into an event;
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follows basehandler functionality.
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- RoomsHandler: does all the room logic, including members - lots of classes in
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RoomsHandler.
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- ProfileHandler: talks to the storage to store/retrieve profile info.
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2014-11-10 21:43:16 +03:00
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* EventFactory: generates events of particular event types.
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* Notifier: Backs the events handler
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* REST: Interfaces handlers and events to the outside world via HTTP/JSON.
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Converts events back and forth from JSON.
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* Federation: holds the HTTP client & server to talk to other servers. Does
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replication to make sure there's nothing missing in the graph. Handles
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reliability. Handles txns.
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* Distributor: generic event bus. used for presence & typing only currently.
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Notifier could be implemented using Distributor - so far we are only using for
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things which actually /require/ dynamic pluggability however as it can
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obfuscate the actual flow of control.
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* Auth: helper singleton to say whether a given event is allowed to do a given
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thing (TODO: put this on the diagram)
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* State: helper singleton: does state conflict resolution. You give it an event
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and it tells you if it actually updates the state or not, and annotates the
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event up properly and handles merge conflict resolution.
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* Storage: abstracts the storage engine.
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