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**中文** | [English](../en/ADAPTER.md)
# Lua Adapter — LLM Source Adaptation Guide
Each LLM API source corresponds to a Lua script, responsible for request transformation (Go unified format → API format) and response transformation (API format → Go unified format).
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Adapter Contract
The Lua script must return a table containing the following fields and functions:
```lua
local adapter = {}
-- Metadata
adapter.name = "my_provider" -- Unique identifier, matches adapter field in config
adapter.version = "2.0.0"
adapter.endpoint = "/v1/chat/completions" -- API path, appended to base_url
adapter.headers = {} -- Additional HTTP request headers
-- Request transformation: Go → API
function adapter.transform_request(raw_json)
-- raw_json: Go's CompletionRequest JSON string
-- Returns: JSON string to send to API
return transformed_json
end
-- Response transformation: API → Go
function adapter.transform_response(raw_json)
-- raw_json: API's raw response JSON string
-- Returns: Unified CompletionResponse JSON string
-- Unified format:
-- { content: "", finish_reason: "", token_usage: { prompt: N, completion: N, total: N }, tool_calls?: [...] }
return unified_json
end
-- Stream chunk transformation (optional)
function adapter.transform_stream_chunk(raw_line)
-- raw_line: JSON string after data: in SSE
-- Returns: JSON of { content: "", done: bool }, return "" to skip this chunk
return chunk_json
end
return adapter
```
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Unified CompletionRequest Format (Go → Adapter)
```json
{
"model": "deepseek-v4-flash",
"messages": [
{ "role": "system", "content": "..." },
{ "role": "user", "content": "..." },
{ "role": "assistant", "content": "...", "tool_calls": [...] }
],
"temperature": 0.7,
"max_tokens": 4096,
"stream": false,
"tools": [...],
"tool_choice": "auto"
}
```
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Unified CompletionResponse Format (Adapter → Go)
```json
{
"content": "Response content",
"finish_reason": "stop",
"token_usage": { "prompt": 10, "completion": 20, "total": 30 },
"tool_calls": [
{ "id": "call_xxx", "type": "function", "name": "tool_name", "arguments": { "key": "val" } }
]
}
```
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Lua VM Built-in Functions
`json.encode(table)` — Encode Lua table to JSON string
`json.decode(string)` — Decode JSON string to Lua table
`log(level, message)` — Output log (level: info/warn/error)
`http_get(url)` — Perform HTTP GET request, returns response body as string
`http_post(url, body)` — Perform HTTP POST request, returns response body as string
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Adapting Typical APIs
| API | endpoint | auth method | Format differences |
|-----|----------|-------------|-------------------|
| **OpenAI** | `/chat/completions` | `Authorization: Bearer <key>` | Standard OpenAI format |
| **DeepSeek** | `/chat/completions` | `Authorization: Bearer <key>` | OpenAI compatible, forces temperature=0 |
| **Anthropic** | `/v1/messages` | `x-api-key: <key>` | Messages API, system message separated, content as block array |
| **Gemini** | `/v1/models/{model}:generateContent` | `?key=<key>` or Bearer | contents/parts format, role uses model instead of assistant |
| **Mistral** | `/v1/chat/completions` | `Authorization: Bearer <key>` | OpenAI compatible |
| **Groq** | `/openai/v1/chat/completions` | `Authorization: Bearer <key>` | OpenAI compatible |
| **GitHub Models** | `/chat/completions` | `Authorization: Bearer <pat>` | OpenAI compatible |
| **Ollama** | `/api/chat` | None | Different options format |
<img src="../../branding/mascot-xiaozhai.webp" width="20" style="border-radius:50%;vertical-align:middle"> :
## Steps to Add a New Source
1. Create `<name>.lua` under `internal/lua/adapters/`
2. Script defines `transform_request` and `transform_response`
3. (Optional) Define `transform_stream_chunk` for streaming support
4. Build verification: `go build ./cmd/homed/`
5. Test verification: `go test ./...`