# Architecture

## Package architecture

![Woodpecker architecture](./woodpecker-architecture.png)

## 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                                                                                                                                                                                |
| -------------------- | ----------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `server/api/**`      | handle web requests from `server/router`                                            | `pipeline`, `../badges`, `../ccmenue`, `../logging`, `../model`, `../pubsub`, `../queue`, `../forge`, `../shared`, `../store`, `shared`, (TODO: mv `server/router/middleware/session`) |
| `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                                                                                                                                                                                    |
| `server/model/**`    | structs for store (db) and api (json)                                               | std                                                                                                                                                                                    |
| `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
