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feat: DNS checker，自研 codec/transport，支持 system/server 双模式，UDP/TCP + TC fallback

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兰缘小妖
2026-05-24 17:06:22 +08:00
parent 4f33fba793
commit 483cdc596b
21 changed files with 5686 additions and 16 deletions
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23
DEVELOPMENT.md
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@@ -97,6 +97,7 @@ src/
tcp/ TCP Checker（自包含模块，含 types/schema/execute/expect/validate）
icmp/ ICMP Checker（自包含模块，含 types/schema/execute/expect/validate/parse）
udp/ UDP Checker（自包含模块，含 types/schema/execute/expect/validate/encoding）
dns/ DNS Checker（自包含模块，含 types/schema/execute/expect/codec/transport）
llm/ LLM Checker（自包含模块，含 types/schema/execute/expect/validate/provider/observation）
shared/
api.ts 前后端共享 TypeScript 类型
@@ -648,16 +649,18 @@ expect(logger.entries[0]!.msg).toContain("UP → DOWN");
**快速失败顺序**：
| Checker | 顺序 |
| ---------- | -------------------------------------------------------------------------------------------------------------------------- |
| HTTP | `status → headers → body → durationMs` |
| Cmd | `exitCode → durationMs → stdout → stderr` |
| DB | `durationMs → rowCount → rows → result` |
| TCP | `connected → banner → durationMs` |
| UDP | `responded → responseSize → response → sourceHost → sourcePort → durationMs` |
| ICMP | `alive → packetLossPercent → avgLatencyMs → maxLatencyMs → durationMs` |
| LLM http | `status → headers → output → finishReason → rawFinishReason → usage → durationMs` |
| LLM stream | `status → headers → stream.completed → stream.firstTokenMs → output → finishReason → rawFinishReason → usage → durationMs` |
| Checker | 顺序 |
| ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| HTTP | `status → headers → body → durationMs` |
| Cmd | `exitCode → durationMs → stdout → stderr` |
| DB | `durationMs → rowCount → rows → result` |
| TCP | `connected → banner → durationMs` |
| UDP | `responded → responseSize → response → sourceHost → sourcePort → durationMs` |
| ICMP | `alive → packetLossPercent → avgLatencyMs → maxLatencyMs → durationMs` |
| DNS system | `values → valueCount → durationMs` |
| DNS server | `responded → rcode → values → valueCount → answerCount → ttlMin → ttlMax → authoritative → recursionAvailable → truncated → authenticatedData → result → durationMs` |
| LLM http | `status → headers → output → finishReason → rawFinishReason → usage → durationMs` |
| LLM stream | `status → headers → stream.completed → stream.firstTokenMs → output → finishReason → rawFinishReason → usage → durationMs` |
HTTP checker 的 `durationMs` 覆盖完整执行（含重定向、按需响应体读取、解码和 expect 校验）。未配置 body expectation、status 失败或 headers 失败时不读取 body；有 body expectation 时，在读取 body 前可先检查 `durationMs` 上界 matcher 是否已不可能通过，避免无意义读取。