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66 lines
3.5 KiB
66 lines
3.5 KiB
5 years ago
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# Synapse Architecture
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As of the end of Oct 2014, Synapse's overall architecture looks like:
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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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| | Event*Handler <--------> rest/* <=> Client
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| | Rooms*Handler | |
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HS <=> 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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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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- BaseHandler gives us onNewRoomEvent which: (TODO: flesh this out and make it less cryptic):
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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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- PresenceHandler: use distributor to get EDUs out of Federation.
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Very lightweight logic built on the distributor
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- TypingHandler: use distributor to get EDUs out of Federation.
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Very 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
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an event; follows basehandler functionality.
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- RoomsHandler: does all the room logic, including members - lots
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of classes in RoomsHandler.
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- ProfileHandler: talks to the storage to store/retrieve profile
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info.
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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
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HTTP/JSON. Converts events back and forth from JSON.
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- Federation: holds the HTTP client & server to talk to other servers.
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Does replication to make sure there's nothing missing in the graph.
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Handles reliability. Handles txns.
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- Distributor: generic event bus. used for presence & typing only
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currently. Notifier could be implemented using Distributor - so far
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we are only using for things which actually /require/ dynamic
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pluggability however as it can obfuscate the actual flow of control.
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- Auth: helper singleton to say whether a given event is allowed to do
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a given thing (TODO: put this on the diagram)
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- State: helper singleton: does state conflict resolution. You give it
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an event and it tells you if it actually updates the state or not,
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and annotates the event up properly and handles merge conflict
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resolution.
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- Storage: abstracts the storage engine.
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