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