96 lines
4.1 KiB
Markdown
96 lines
4.1 KiB
Markdown
# Backend Agent Instructions
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## Stack
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- **Go 1.25.5** (`reichard.io/aethera`)
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- **cobra** (CLI framework)
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- **logrus** (structured logging)
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- **openai-go/v3** (OpenAI API client)
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- **jsonschema-go** (structured output schema generation)
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- **testify** (testing assertions)
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- **golangci-lint** (linting)
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## Commands
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```bash
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go build -o ./dist/aethera ./cmd # Build binary
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golangci-lint run # Lint
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go test ./... # Run all tests
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```
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## Architecture
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Frontend assets are embedded at compile time via `web/embed.go` (`//go:embed static/*`). The `make frontend` target copies built frontend output into `backend/web/static/` before the Go build.
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### Directory Layout
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```
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cmd/ # CLI entry (main.go, config.go)
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internal/
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api/ # HTTP handlers, request/response types, streaming generation
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client/ # OpenAI-compatible API client (chat, images, structured output)
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server/ # HTTP server setup, routing, logging middleware
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store/ # Store interface + FileStore (JSON files) & InMemoryStore
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storage/ # Standalone file utilities (e.g. ListImages)
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types/ # Shared domain types (MessageStats)
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pkg/
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ptr/ # Generic pointer helpers (Of, DerefOrZero)
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slices/ # Generic slice helpers (Map, First, Last, FindFirst)
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values/ # Generic value helpers (FirstNonZero, CountNonZero)
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web/ # Embedded static assets (embed.go)
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```
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### Key Patterns
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- **Store interface** (`internal/store/interface.go`): abstraction over settings + chat persistence. Two implementations:
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- `FileStore` — JSON files on disk (settings.json + `chats/*.json`). Used in production.
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- `InMemoryStore` — map-based, thread-safe with `sync.RWMutex`. Used in tests.
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- **DI via constructors**: `api.New(store, dataDir, logger)`, `client.NewClient(baseURL)`, `store.NewFileStore(path)`
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- **Streaming**: `generationManager` coordinates concurrent chat completions. One active generation per chat. Subscribers receive `MessageChunk` updates via channels over NDJSON (`application/x-ndjson`).
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- **Client lazy init**: `api.getClient()` creates the OpenAI client on first use from stored settings, invalidated on settings change.
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- **Env vars**: all prefixed `AETHERA_` (e.g. `AETHERA_PORT`, `AETHERA_DATA_DIR`). CLI flags override env.
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### API Routes
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| Method | Path | Handler |
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|----------|-------------------------------|--------------------|
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| GET | `/api/settings` | GetSettings |
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| POST | `/api/settings` | PostSettings |
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| GET | `/api/models` | GetModels |
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| GET | `/api/images` | GetImages |
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| POST | `/api/images` | PostImage |
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| DELETE | `/api/images/{filename}` | DeleteImage |
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| GET | `/api/chats` | GetChats |
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| POST | `/api/chats` | PostChat |
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| GET | `/api/chats/{chatId}` | GetChat |
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| POST | `/api/chats/{chatId}` | PostChatMessage |
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| DELETE | `/api/chats/{chatId}` | DeleteChat |
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| GET | `/api/chats/{chatId}/stream` | GetChatStream |
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| POST | `/api/chats/{chatId}/stop` | StopChatGeneration |
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## Testing
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- Use `testify` (`require` for fatal, `assert` for non-fatal)
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- Test both success and error paths
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- Table-driven tests where appropriate
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- File-based storage tests use temp directories
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- Concurrency safety is verified
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## Non-Negotiables
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- ❌ No unhandled errors — always check `err`
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- ❌ No ignored linter warnings
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- ❌ No sensitive data in logs
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- ❌ No hardcoded paths — use `path.Join`
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- ❌ No unsafe file access — use `filepath.Base`
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- ❌ Don't skip tests or linting
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## Code Style
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- Tab indentation, PascalCase exports, camelCase internal
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- Error wrapping with context: `fmt.Errorf("...: %w", err)`
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- Sentinel errors for domain cases (`ErrChatNotFound`, `ErrNilChatID`)
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- Struct tags for JSON with `omitempty`
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- Log with context: `log.WithField("key", val)`
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- Clean up resources with `defer`
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