Add WIP backend arch diagram

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Gabe Kangas 2023-02-22 21:20:59 -08:00
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# Owncast Backend Architecture
Work in progress documentation detailing the backend architecture of Owncast.
## Structure
WIP
## Diagram
```mermaid
%% Owncast backend architecture.
%% See https://jojozhuang.github.io/tutorial/mermaid-cheat-sheet/
%% for a cheat sheet on creating this diagram.
%% Paste this document in https://mermaid.live as a quick way to edit.
%% This is a graph style diagram, Top Down.
graph TD
%% Define Nodes and Subgraphs
subgraph VideoPipeline[Video Pipeline]
VideoTranscoder(fa:fa-video Video Transcoder)
RTMPService[fa:fa-video RTMP Service]
FFMpeg[fa:fa-video ffmpeg]
end
subgraph ChatService[fa:fa-comment Chat Service]
end
subgraph Dependencies
subgraph Webhooks[fa:fa-webhook Webhooks]
InboundWebhooks[Inbound]
OutboundWebhooks[Outbound]
end
App{Application}
ChatService--->App
Webhooks--->App
ConfigRepository(fa:fa-hard-drive Config Repository)--->App
UserRepository(fa:fa-hard-drive User Repository)--->App
Database(fa:fa-hard-drive Database)--->ConfigRepository
Database--->UserRepository
ApplicationState(fa:fa-list Application State)--->App
GeoIP(fa:fa-globe GeoIP Lookup)--->App
Statistics(fa:fa-list Statistics)--->App
end
subgraph VideoStorageProviders[Video Storage Providers]
LocalStorage((fa:fa-hard-drive Local Storage))
S3Storage((fa:fa-hard-drive S3 Storage))
end
subgraph ActivityPub
ActivityPubInboundHandlers[fa:fa-hashtag Inbound]
ActivityPubOutboundHandlers[fa:fa-hashtag Outbound]
end
subgraph Authentication
IndieAuth[fa:fa-key IndieAuth]
FediAuth[fa:fa-key FediAuth]
end
subgraph Notifications
DiscordNotifier[fa:fa-comment Discord]
BrowserNotifier[fa:fa-browser Browser]
end
subgraph WebServer[Web Server]
ActivityPubHandlers[fa:fa-file ActivityPub Handlers]
StaticFiles((fa:fa-file Static Files))
WebSocket[WebSocket]
subgraph WebAssets[Web Assets]
EmbeddedStaticFiles((fa:fa-file Embedded\nStatic Assets))
OnDiskStaticFiles((fa:fa-file On Disk\nStatic Assets))
WebApplication[fa:fa-file Web\nApplication]
PublicFiles[fa:fa-file Public\nDirectory]
end
subgraph HTTPHandlers[fa:fa-browser HTTP Handlers]
subgraph AdminAPIs[Admin APIs]
end
subgraph ChatAPIs[Chat APIs]
ChatUserRegistration[Chat User Registration]
Emoji[Emojis]
subgraph ChatAuthAPIs[Chat Authentication]
FediAuth
IndieAuth
end
end
subgraph VideoAPIs[fa:fa-video Video APIs]
ViewerPing[Viewer Ping]
PlaybackMetrics[Playback health metrics]
end
ActivityPubHandlers
ApplicationConfig[Application Config]
ApplicationStatus[Application Status]
Directory[Directory API]
Followers[Followers]
end
end
subgraph Streamer
BroadcastingSoftware>fa:fa-video BroadcastingSoftware]
end
subgraph Viewer
VideoPlayer[fa:fa-video Video Player]
WebBrowser[fa:fa-browser Web Browser]
end
%% All the services and packages require access
%% to dependencies through a Application reference.
App-.->HTTPHandlers
App-.->RTMPService
App-.->ActivityPub
App-.->Authentication
App-.Stream went\nonline.->Notifications
App-.->DirectoryNotifier[Directory Notifier]
LocalStorage--HLS-->OnDiskStaticFiles
RTMPService>RTMP Ingest]--RTMP-->VideoTranscoder
VideoTranscoder--HLS-->VideoStorageProviders
VideoTranscoder--RTMP-->FFMpeg
FFMpeg--HLS-->VideoTranscoder
%% Viewers
VideoPlayer-->VideoStorageProviders
WebBrowser-->WebAssets
%% Streamers
BroadcastingSoftware--RTMP-->RTMPService
%% Style the nodes
%% Define reusable styles for node types
classDef bigtext font-weight:bold,font-size:20px
classDef repository fill:#4F625B,color:#fff
classDef webservice fill:#6082B6,color:#fff
classDef rtmp fill:#608200, color:#fff
classDef inbound fill:#6544e9,stoke:#fff,color:#fff
classDef outboundservice fill:#2386e2,stroke:green,color:#fff
classDef storage fill:#42bea6,color:#fff
%% Assign styles to nodes
class App bigtext
class UserRepository repository
class ConfigRepository repository
class WebSocket inbound
class HTTPHandlers inbound
class ActivityPubInboundHandlers inbound
class InboundWebhooks inbound
class ActivityPubOutboundHandlers outboundservice
class DiscordNotifier outboundservice
class BrowserNotifier outboundservice
class OutboundWebhooks outboundservice
class DirectoryNotifier outboundservice
class BroadcastingSoftware rtmp
class RTMPService rtmp
class Database storage
class LocalStorage storage
class S3Storage storage
%% Customize the theme styles
%%{init: {'theme':'base', 'themeVariables': {'darkMode': true, 'lineColor': '#c3dafe', 'tertiaryTextColor': 'white', 'clusterBkg': '#2d3748', 'primaryTextColor': '#39373d', "edgeLabelBackground": "white", "fontFamily": "monospace"}}}%%
```