2020-06-15 09:13:57 +00:00
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This document details how various components communicate with each other. There are two kinds of components:
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- Public-facing: exposes CS/SS API endpoints and need to be routed to via client-api-proxy or equivalent.
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- Internal-only: exposes internal APIs and produces Kafka events.
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## Internal HTTP APIs
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Not everything can be done using Kafka logs. For example, requesting the latest events in a room is much better suited to
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a request/response model like HTTP or RPC. Therefore, components can expose "internal APIs" which sit outside of Kafka logs.
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Note in Monolith mode these are actually direct function calls and are not serialised HTTP requests.
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```
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Tier 1 Sync PublicRooms FederationAPI ClientAPI MediaAPI
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Public Facing | .-----1------` | | | | | | | | |
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2 | .-------3-----------------` | | | `--------|-|-|-|--11--------------------.
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| | | .--------4----------------------------------` | | | |
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| | | | .---5-----------` | | | | | |
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| | | | | .---6----------------------------` | | |
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| | | | | | | .-----7----------` | |
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| | | | | | 8 | | 10 |
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| | | | | | | | `---9----. | |
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V V V V V V V V V V V
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Tier 2 Roomserver EDUServer FedSender AppService KeyServer ServerKeyAPI
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Internal only | `------------------------12----------^ ^
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`------------------------------------------------------------13----------`
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Client ---> Server
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```
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- 1 (PublicRooms -> Roomserver): Calculating current auth for changing visibility
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- 2 (Sync -> Roomserver): When making backfill requests
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- 3 (FedAPI -> Roomserver): Calculating (prev/auth events) and sending new events, processing backfill/state/state_ids requests
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- 4 (ClientAPI -> Roomserver): Calculating (prev/auth events) and sending new events, processing /state requests
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- 5 (FedAPI -> EDUServer): Sending typing/send-to-device events
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- 6 (ClientAPI -> EDUServer): Sending typing/send-to-device events
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- 7 (ClientAPI -> FedSender): Handling directory lookups
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- 8 (FedAPI -> FedSender): Resetting backoffs when receiving traffic from a server. Querying joined hosts when handling alias lookup requests
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- 9 (FedAPI -> AppService): Working out if the client is an appservice user
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- 10 (ClientAPI -> AppService): Working out if the client is an appservice user
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- 11 (FedAPI -> ServerKeyAPI): Verifying incoming event signatures
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- 12 (FedSender -> ServerKeyAPI): Verifying event signatures of responses (e.g from send_join)
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- 13 (Roomserver -> ServerKeyAPI): Verifying event signatures of backfilled events
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2020-06-16 16:05:38 +00:00
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In addition to this, all public facing components (Tier 1) talk to the `UserAPI` to verify access tokens and extract profile information where needed.
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2020-06-15 09:13:57 +00:00
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## Kafka logs
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```
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.----1--------------------------------------------.
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V |
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Tier 1 Sync PublicRooms FederationAPI ClientAPI MediaAPI
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Public Facing ^ ^ ^ ^
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2 | | |
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| `-3------------. |
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| .------4------` | |
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| | .--------5-----|------------------------------`
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Tier 2 Roomserver EDUServer FedSender AppService KeyServer ServerKeyAPI
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Internal only | | ^ ^
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| `-----6----------` |
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`--------------------7--------`
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Producer ----> Consumer
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```
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- 1 (ClientAPI -> Sync): For tracking account data
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- 2 (Roomserver -> Sync): For all data to send to clients
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- 3 (EDUServer -> Sync): For typing/send-to-device data to send to clients
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- 4 (Roomserver -> PublicRooms): For tracking the current room name/topic/joined count/etc.
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- 5 (Roomserver -> ClientAPI): For tracking memberships for profile updates.
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- 6 (EDUServer -> FedSender): For sending EDUs over federation
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- 7 (Roomserver -> FedSender): For sending PDUs over federation, for tracking joined hosts.
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