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# Architecture
## Package architecture
## System architecture
### main package hierarchy
| package | meaning | imports |
| ------------------ | -------------------------------------------------------------- | ------------------------------------- |
| `cmd/**` | parse command-line args & environment to stat server/cli/agent | all other |
| `agent/**` | code only agent (remote worker) will need | `pipeline` , `shared` |
| `cli/**` | code only cli tool does need | `pipeline` , `shared` , `woodpecker-go` |
| `server/**` | code only server will need | `pipeline` , `shared` |
| `shared/**` | code shared for all three main tools (go help utils) | only std and external libs |
| `woodpecker-go/**` | go client for server rest api | std |
### Server
| package | meaning | imports |
| -------------------- | ----------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `server/api/**` | handle web requests from `server/router` | `pipeline` , `../badges` , `../ccmenu` , `../logging` , `../model` , `../pubsub` , `../queue` , `../forge` , `../shared` , `../store` , `shared` , (TODO: mv `server/router/middleware/session` ) |
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| `server/badges/**` | generate svg badges for pipelines | `../model` |
| `server/ccmenu/**` | generate xml ccmenu for pipelines | `../model` |
| `server/grpc/**` | gRPC server agents can connect to | `pipeline/rpc/**` , `../logging` , `../model` , `../pubsub` , `../queue` , `../forge` , `../pipeline` , `../store` |
| `server/logging/**` | logging lib for gPRC server to stream logs while running | std |
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| `server/model/**` | structs for store (db) and api (json) | std |
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| `server/plugins/**` | plugins for server | `../model` , `../forge` |
| `server/pipeline/**` | orchestrate pipelines | `pipeline` , `../model` , `../pubsub` , `../queue` , `../forge` , `../store` , `../plugins` |
| `server/pubsub/**` | pubsub lib for server to push changes to the WebUI | std |
| `server/queue/**` | queue lib for server where agents pull new pipelines from via gRPC | `server/model` |
| `server/forge/**` | forge lib for server to connect and handle forge specific stuff | `shared` , `server/model` |
| `server/router/**` | handle requests to REST API (and all middleware) and serve UI and WebUI config | `shared` , `../api` , `../model` , `../forge` , `../store` , `../web` |
| `server/store/**` | handle database | `server/model` |
| `server/shared/**` | TODO: move and split [#974 ](https://github.com/woodpecker-ci/woodpecker/issues/974 ) | |
| `server/web/**` | server SPA | |
- `../` = `server/`
### Agent
TODO
### CLI
TODO
