arcrun — AI workflow execution engine (clean history)
Self-hosted 開源:WASM 零件 + recipe + cypher-executor,跑在你自己的 Cloudflare。 此為重建的乾淨歷史起點(移除曾誤 commit 的 GCP SA 金鑰,舊歷史保留在 richblack/arcrun 與本地 backup 分支)。含: - acr init --self-hosted installer(建 KV/R2 + codeload 拉預編譯 wasm + wrangler deploy + seed recipe) - recipe push 把關(資料外流提醒 + 打通檢查) - 19 個正當零件預編譯 wasm(claude_api/km_writer/kbdb_upsert_block 排除:違反 DECISIONS §1) - CLI / cypher-executor / registry / 完整 SDD Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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# Skill: Add New WASM Component
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## 何時用這個 skill
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`arcrun_list_components()` 沒有你需要的零件。要寫一個新的 TinyGo / AssemblyScript WASM。
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**重要**:寫零件 = **改 arcrun 平台本身**,不是改 user workflow。
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這 skill 預設你有 arcrun repo write access。沒有 → 告訴用戶「需要 X 零件,請聯絡平台維護者」,停手。
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## 7 步流程
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### 1. 確認真的需要新零件
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先想:能不能用 `http_request` 加組合搞定?
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- 多數第三方 API → `http_request` 已夠(搭配 `auth_recipe` 處理 auth)
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- 簡單轉換 → 用 logic primitives(`set` / `filter` / `array_ops`)
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- 複雜流程編排 → cypher binding 多步而非單一大零件
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真的需要新零件的場景:
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- 跟 cypher-executor host functions 互動(KV、加解密、簽 JWT)
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- 邏輯太複雜不適合多節點分解
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- 為效能(一次 worker call 取代 10 次 fetch)
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### 2. 讀規範
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- `matrix/arcrun/.claude/rules/03-component-architecture.md` — 部署慣例
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- `matrix/arcrun/.claude/rules/01-tech-stack.md` — TinyGo 限制
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- 既有相似零件範例:`matrix/arcrun/registry/components/{name}/main.go`
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### 3. 開新目錄
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```
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matrix/arcrun/registry/components/{your_component}/
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├── main.go TinyGo source
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├── component.contract.yaml input/output schema + 描述
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└── (build 後產出 .wasm)
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```
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合約格式(contract.yaml):
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```yaml
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canonical_id: your_component
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display_name: 中文顯示名
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category: data | auth | api | logic
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version: 0.1.0
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description: |
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做什麼用、限制、注意事項。AI 看這份決定要不要用你的零件
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input_schema:
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type: object
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required: [foo, bar]
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properties:
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foo: { type: string, description: "..." }
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bar: { type: number, description: "..." }
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output_schema:
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type: object
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properties:
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result: { type: string }
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success: { type: boolean }
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gherkin_tests:
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- given: "input foo=hello"
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when: "component runs"
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then: "result contains hello"
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```
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### 4. 寫 main.go
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```go
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package main
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import (
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"encoding/json"
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"io"
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"os"
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)
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type Input struct {
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Foo string `json:"foo"`
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Bar int `json:"bar"`
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}
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type Output struct {
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Result string `json:"result"`
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Success bool `json:"success"`
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}
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func main() {
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bytes, _ := io.ReadAll(os.Stdin)
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var in Input
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json.Unmarshal(bytes, &in)
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// 你的邏輯
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result := in.Foo + ":" + string(rune(in.Bar))
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out := Output{Result: result, Success: true}
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json.NewEncoder(os.Stdout).Encode(out)
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}
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```
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限制:
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- 只 import:`os`、`io`、`encoding/json`、`encoding/base64`、`strings`、`time` 等 stdlib
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- **禁用**:`net/http`(用 host function `u6u.http_request`)、`crypto/rsa`(用 host function)
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- 全部 logic 在 main(),stdin/stdout JSON I/O
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### 5. 本地 build + 測
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```bash
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cd registry/components/your_component
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tinygo build -target=wasi -o your_component.wasm main.go
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echo '{"foo":"hello","bar":42}' | wasmtime your_component.wasm
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```
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### 6. 部署成獨立 Worker
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```
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.component-builds/your_component/
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├── wrangler.toml name = "arcrun-your-component"
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├── package.json
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├── component.wasm 從上面 build 複製過來
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└── src/index.ts 固定 WASI shim(複製 component-worker-template)
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```
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`wrangler.toml`:
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```toml
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name = "arcrun-your-component"
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main = "src/index.ts"
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compatibility_date = "2025-02-19"
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workers_dev = true # 必須 true,cypher-executor 走 workers.dev 對內 URL
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[[routes]]
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pattern = "your-component.arcrun.dev/*"
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zone_name = "arcrun.dev"
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```
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push → CI 自動部署。
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### 7. 註冊到 cypher-executor 白名單
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⚠️ **目前的架構債**(M2 計畫修):每加零件要手動加 `cypher-executor/src/lib/component-loader.ts`:
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```ts
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const WASM_HTTP_RUNNER_IDS: ReadonlySet<string> = new Set([
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// ... 既有
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'your_component', // ← 加這行
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]);
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```
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不加 → workflow 用你的零件會噴「找不到零件」。
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未來會改成 registry KV 動態查(`cypher-executor-dynamic-component-discovery` SDD 待開)。
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## 驗證上線
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```
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arcrun_list_components() → 應該看到 your_component
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arcrun_get_component_contract(canonical_id='your_component') → 看 schema
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```
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寫個 test workflow 用你的零件,跑通就完成。
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