# Lolly 实际问题修复实施计划

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** 修复 code review 中识别的关键实际问题和风险：配置默认值未应用、状态端点注册条件错误、生产代码中的非 zerolog 日志、以及小技术债。

**Architecture:** Task A 和 Task B 有依赖关系：Task A 修复默认值合并后，会让 `Monitoring.Status.Path` 和 `Allow` 变成非空，从而触发 `startSingleMode` 中错误的注册条件（原本用 Path/Allow 判断，应该改为 Enabled）。因此两个修复必须在一个 commit 中或按正确顺序提交。Task C 独立。

**Tech Stack:** Go 1.26+, zerolog, fasthttp, yaml.v3

---

## 文件结构映射

### Task A+B: 配置默认值合并 + Monitoring 注册条件修复 + 日志统一
- **Modify:** `internal/config/config.go` — `Load()` 从 DefaultConfig() 开始 unmarshal
- **Create:** `internal/config/load_test.go` — 默认值合并测试
- **Modify:** `internal/server/server.go` — monitoring 注册条件改为 `Enabled` 检查
- **Create:** `internal/server/monitoring_registration_test.go` — 注册条件回归测试
- **Modify:** `internal/server/status.go` — 替换 4 处 `log.Printf` 为 zerolog
- **Modify:** `internal/lua/api_timer.go` — 替换 4 处 `log.Printf` 为 zerolog

### Task C: 小技术债清理
- **Modify:** `internal/proxy/proxy.go` — 删除 `//go:generate go test -v ./...`

---

## Task A+B: 配置默认值合并 + Monitoring 条件修复 + 日志统一

### 子任务 A1: 实现 config.Load() 默认值合并

**Files:**
- Modify: `internal/config/config.go:131-158`
- Create: `internal/config/load_test.go`

- [ ] **Step A1.1: 编写失败测试验证当前行为**

创建 `internal/config/load_test.go`：

```go
package config

import (
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestLoad_MergesDefaults(t *testing.T) {
	tmpDir := t.TempDir()
	path := filepath.Join(tmpDir, "minimal.yaml")
	content := `
servers:
  - listen: ":8080"
`
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		t.Fatalf("write config: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}

	if cfg.Performance.FileCache.MaxEntries == 0 {
		t.Error("Performance.FileCache.MaxEntries should have default value")
	}
	if cfg.Performance.FileCache.MaxSize == 0 {
		t.Error("Performance.FileCache.MaxSize should have default value")
	}
	if cfg.Performance.FileCache.Inactive == 0 {
		t.Error("Performance.FileCache.Inactive should have default value")
	}
	if cfg.Monitoring.Status.Path != "/_status" {
		t.Errorf("Monitoring.Status.Path = %q, want %q", cfg.Monitoring.Status.Path, "/_status")
	}
	if cfg.Monitoring.Pprof.Path != "/debug/pprof" {
		t.Errorf("Monitoring.Pprof.Path = %q, want %q", cfg.Monitoring.Pprof.Path, "/debug/pprof")
	}
	if cfg.Resolver.CacheTTL == 0 {
		t.Error("Resolver.CacheTTL should have default value")
	}
}

func TestLoad_ExplicitOverridesDefault(t *testing.T) {
	tmpDir := t.TempDir()
	path := filepath.Join(tmpDir, "explicit.yaml")
	content := `
performance:
  file_cache:
    max_entries: 500
    max_size: 52428800
    inactive: 120s
servers:
  - listen: ":8080"
`
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		t.Fatalf("write config: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}

	if cfg.Performance.FileCache.MaxEntries != 500 {
		t.Errorf("MaxEntries = %d, want 500", cfg.Performance.FileCache.MaxEntries)
	}
	if cfg.Performance.FileCache.MaxSize != 52428800 {
		t.Errorf("MaxSize = %d, want 52428800", cfg.Performance.FileCache.MaxSize)
	}
	if cfg.Performance.FileCache.Inactive != 120*time.Second {
		t.Errorf("Inactive = %v, want 120s", cfg.Performance.FileCache.Inactive)
	}
}

func TestLoad_MonitoringDisabledByDefault(t *testing.T) {
	tmpDir := t.TempDir()
	path := filepath.Join(tmpDir, "minimal.yaml")
	content := `
servers:
  - listen: ":8080"
`
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		t.Fatalf("write config: %v", err)
	}

	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load failed: %v", err)
	}

	// 默认值 Path 存在，但 Enabled 应为 false
	if cfg.Monitoring.Status.Enabled {
		t.Error("Monitoring.Status.Enabled should be false by default")
	}
	if cfg.Monitoring.Pprof.Enabled {
		t.Error("Monitoring.Pprof.Enabled should be false by default")
	}
	if cfg.Monitoring.Status.Path != "/_status" {
		t.Errorf("Monitoring.Status.Path = %q, want %q", cfg.Monitoring.Status.Path, "/_status")
	}
}
```

运行：

```bash
go test -v -run "TestLoad_" ./internal/config/...
```

Expected: FAIL — `TestLoad_MergesDefaults` 和 `TestLoad_MonitoringDisabledByDefault` 失败

- [ ] **Step A1.2: 修改 Load() 从 DefaultConfig() 开始**

修改 `internal/config/config.go`：

```go
func Load(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("读取配置文件失败: %w", err)
	}

	// 从默认值开始，YAML 只覆盖显式配置的字段。
	// 注意：yaml.v3 对 slice 会整体替换，因此用户显式配置的 Servers[]
	// 元素不会继承 server-level 默认值；但顶层 struct 字段（Performance、
	// Monitoring、Resolver）的默认值会被保留。
	cfg := DefaultConfig()
	if err := yaml.Unmarshal(data, cfg); err != nil {
		return nil, fmt.Errorf("解析配置文件失败: %w", err)
	}

	if len(cfg.Include) > 0 {
		absPath, err := filepath.Abs(path)
		if err != nil {
			return nil, fmt.Errorf("获取配置文件绝对路径失败: %w", err)
		}
		visited := map[string]bool{absPath: true}
		if err := processIncludes(cfg, filepath.Dir(path), 0, visited); err != nil {
			return nil, fmt.Errorf("处理配置引入失败: %w", err)
		}
	}

	if err := Validate(cfg); err != nil {
		return nil, fmt.Errorf("配置验证失败: %w", err)
	}

	return cfg, nil
}
```

- [ ] **Step A1.3: 运行测试确认 A1 修复**

```bash
go test -v -run "TestLoad_" ./internal/config/...
```

Expected: `TestLoad_MergesDefaults` PASS, `TestLoad_ExplicitOverridesDefault` PASS, `TestLoad_MonitoringDisabledByDefault` PASS

---

### 子任务 B1: 修复 monitoring 注册条件（防止 Task A 引入 regression）

**Files:**
- Modify: `internal/server/server.go:478-490`, `492-508`, `510-520`

**背景：** `startSingleMode` 当前用 `Path != "" || len(Allow) > 0` 判断是否注册 status handler。Task A 修复后，`Monitoring.Status.Path` 默认值变成 `"/_status"`，`Allow` 默认也有值，这会导致即使用户没有启用 monitoring，handler 也会被注册。必须改为检查 `Enabled`，与 vhost 模式保持一致。

- [ ] **Step B1.1: 修改 status handler 注册条件**

`internal/server/server.go` 第 478-490 行：

```go
// BEFORE
if s.config.Monitoring.Status.Path != "" || len(s.config.Monitoring.Status.Allow) > 0 {
    statusHandler, err := NewStatusHandler(s, &s.config.Monitoring.Status)
    ...
}

// AFTER
if s.config.Monitoring.Status.Enabled {
    statusHandler, err := NewStatusHandler(s, &s.config.Monitoring.Status)
    ...
}
```

- [ ] **Step B1.2: 确认 pprof 和 purge 使用 Enabled 检查**

pprof 已经是 `if s.config.Monitoring.Pprof.Enabled {`，保持不变。
purge 已经是 `if serverCfg.CacheAPI != nil && serverCfg.CacheAPI.Enabled {`，保持不变。

- [ ] **Step B1.3: 添加注册条件回归测试**

创建 `internal/server/monitoring_registration_test.go`：

```go
package server

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/valyala/fasthttp"
	"rua.plus/lolly/internal/config"
)

func TestMonitoringEndpoints_OnlyRegisteredWhenEnabled(t *testing.T) {
	// Case 1: monitoring 未启用时，/_status 不应注册
	cfg := &config.Config{
		Servers: []config.ServerConfig{{
			Listen: "127.0.0.1:0",
			Static: []config.StaticConfig{{
				Path: "/",
				Root: t.TempDir(),
			}},
		}},
	}

	srv := New(cfg)
	go srv.Start()
	defer srv.Stop()

	listeners := srv.GetListeners()
	if len(listeners) == 0 {
		t.Fatal("server has no listeners")
	}
	addr := listeners[0].Addr().String()

	client := &fasthttp.Client{}
	req := fasthttp.AcquireRequest()
	resp := fasthttp.AcquireResponse()
	defer fasthttp.ReleaseRequest(req)
	defer fasthttp.ReleaseResponse(resp)

	req.SetRequestURI("http://" + addr + "/_status")
	req.Header.SetMethod("GET")

	if err := client.Do(req, resp); err != nil {
		t.Fatalf("request failed: %v", err)
	}

	// 未启用时应返回 404（被 static handler 处理，找不到文件）
	assert.Equal(t, fasthttp.StatusNotFound, resp.StatusCode(),
		"status endpoint should NOT be registered when monitoring is disabled")
}

func TestMonitoringEndpoints_ReachableWhenEnabled(t *testing.T) {
	cfg := &config.Config{
		Monitoring: config.MonitoringConfig{
			Status: config.StatusConfig{
				Enabled: true,
				Path:    "/_status",
				Allow:   []string{"127.0.0.1"},
			},
		},
		Servers: []config.ServerConfig{{
			Listen: "127.0.0.1:0",
			Static: []config.StaticConfig{{
				Path: "/",
				Root: t.TempDir(),
			}},
		}},
	}

	srv := New(cfg)
	go srv.Start()
	defer srv.Stop()

	listeners := srv.GetListeners()
	if len(listeners) == 0 {
		t.Fatal("server has no listeners")
	}
	addr := listeners[0].Addr().String()

	client := &fasthttp.Client{}
	req := fasthttp.AcquireRequest()
	resp := fasthttp.AcquireResponse()
	defer fasthttp.ReleaseRequest(req)
	defer fasthttp.ReleaseResponse(resp)

	req.SetRequestURI("http://" + addr + "/_status")
	req.Header.SetMethod("GET")

	if err := client.Do(req, resp); err != nil {
		t.Fatalf("request failed: %v", err)
	}

	assert.Equal(t, fasthttp.StatusOK, resp.StatusCode(),
		"status endpoint should be reachable when enabled, even with static handler on /")
}

func TestLocationEngine_StatusExactBeatsStaticPrefix(t *testing.T) {
	// 独立验证 location engine 的优先级：exact match 应该 beat prefix /
	engine := matcher.NewLocationEngine()

	var exactCalled, prefixCalled bool
	engine.AddExact("/_status", func(ctx *fasthttp.RequestCtx) {
		exactCalled = true
		ctx.SetStatusCode(fasthttp.StatusOK)
	}, false)
	engine.AddPrefix("/", func(ctx *fasthttp.RequestCtx) {
		prefixCalled = true
		ctx.SetStatusCode(fasthttp.StatusNotFound)
	}, false)
	engine.MarkInitialized()

	result := engine.Match([]byte("/_status"))
	if result == nil {
		t.Fatal("expected match")
	}
	if result.LocationType != matcher.LocationTypeExact {
		t.Errorf("expected exact match, got %s", result.LocationType)
	}
}
```

注意：需要导入 `rua.plus/lolly/internal/matcher`。

- [ ] **Step B1.4: 运行测试**

```bash
go test -v -run "TestMonitoringEndpoints|TestLocationEngine" ./internal/server/...
```

Expected:
- `TestMonitoringEndpoints_OnlyRegisteredWhenEnabled` PASS（返回 404）
- `TestMonitoringEndpoints_ReachableWhenEnabled` PASS（返回 200）
- `TestLocationEngine_StatusExactBeatsStaticPrefix` PASS

---

### 子任务 B2: 替换生产代码中的 log.Printf

**Files:**
- Modify: `internal/server/status.go`
- Modify: `internal/lua/api_timer.go`

- [ ] **Step B2.1: 替换 status.go 中的 log.Printf**

修改 `internal/server/status.go`：
- 删除 `"log"` import
- 添加 `"rua.plus/lolly/internal/logging"` import（如果不存在）

替换 4 处：

```go
// 约 302 行
logging.Error().Err(err).Msg("failed to write metrics response")

// 约 318 行
logging.Error().Err(err).Msg("failed to write status response")

// 约 375 行
logging.Error().Err(err).Msg("failed to write text response")

// 约 480 行
logging.Error().Err(err).Msg("failed to write html response")
```

- [ ] **Step B2.2: 替换 lua/api_timer.go 中的 log.Printf**

修改 `internal/lua/api_timer.go`：
- 删除 `"log"` import
- 添加 `"rua.plus/lolly/internal/logging"` import

替换 4 处：

```go
// 约 264 行
logging.Warn().Msg("[lua] timer callback dropped: queue full")

// 约 280 行
logging.Error().Msg("[lua] timer callback: failed to create function from proto")

// 约 289 行
logging.Error().Err(err).Msg("[lua] timer callback error")

// 约 408 行
logging.Warn().Int("abandoned", abandoned).Msg("[lua] shutdown timeout: callbacks abandoned")
```

- [ ] **Step B2.3: 运行测试**

```bash
go test -v ./internal/server/... ./internal/lua/...
```

Expected: PASS

---

### 子任务 A+B 提交

Task A 和 Task B1 必须一起提交，否则单独提交 A 会引入 regression。

```bash
git add internal/config/config.go internal/config/load_test.go
-git add internal/server/server.go internal/server/monitoring_registration_test.go
-git add internal/server/status.go internal/lua/api_timer.go
git commit -m "fix(config,server): merge defaults on Load and fix monitoring registration

Two related fixes that must land together:

1. config.Load() now starts from DefaultConfig() before unmarshaling
   YAML. This ensures missing top-level fields (Performance,
   Monitoring, Resolver) use their documented defaults instead of
   zero values. Most importantly, file_cache is no longer silently
   disabled when users omit the performance: section.

2. startSingleMode() now checks Monitoring.Status.Enabled instead of
   Path/Allow to decide whether to register the status endpoint.
   Without this change, fix #1 would have caused a regression where
   the status handler is registered even when monitoring is disabled,
   because DefaultConfig() sets Path and Allow defaults.

Also replace remaining log.Printf in status.go and lua/api_timer.go
with zerolog to follow project logging conventions.

Added tests:
- config/load_test.go: verifies defaults are applied, explicit values
  override defaults, and monitoring stays disabled by default.
- server/monitoring_registration_test.go: verifies /_status is only
  registered when enabled and remains reachable with static handler
  on path: /."
```

---

## Task C: 清理 proxy.go 的 go:generate

**Files:**
- Modify: `internal/proxy/proxy.go:31`

- [ ] **Step C1: 删除不合理的 go:generate**

删除 `internal/proxy/proxy.go` 第 31 行：

```go
//go:generate go test -v ./...
```

- [ ] **Step C2: 运行测试**

```bash
go test ./internal/proxy/...
```

Expected: PASS

- [ ] **Step C3: Commit Task C**

```bash
git add internal/proxy/proxy.go
git commit -m "chore(proxy): remove misplaced go:generate directive

The //go:generate go test -v ./... directive is not what
go:generate is intended for (code generation, not test execution).
Remove it to avoid confusion."
```

---

## Task D: 最终验证

- [ ] **Step D1: 运行全量测试**

```bash
go test ./internal/... -count=1 2>&1 | tail -30
```

Expected: 除已知 integration DNS 测试外全部 PASS

- [ ] **Step D2: 运行 race detector**

```bash
go test -race ./internal/config/... ./internal/server/... ./internal/lua/... ./internal/proxy/... -count=1
```

Expected: 零 race

- [ ] **Step D3: 运行 linter**

```bash
make lint
```

Expected: 0 issues

- [ ] **Step D4: 检查无 log.Printf 残留**

```bash
grep -rn "^[[:space:]]*log\.Printf\|^[[:space:]]*log\.Println\|^[[:space:]]*log\.Fatal" internal/ --include='*.go' | grep -v '_test.go' | grep -v '//'
```

Expected: 空（`app/import.go` 中的 `fmt.Printf` 是 CLI 输出，允许保留）

- [ ] **Step D5: 运行 build**

```bash
make build
```

Expected: 构建成功

---

## Spec Coverage Check

| 发现的问题 | 对应修复 |
|-----------|---------|
| config.Load() 不合并 DefaultConfig() | Task A: Load() 从 DefaultConfig() 开始 unmarshal |
| Task A 会引入 monitoring Enabled 回归 | Task B1: 注册条件改为 Enabled |
| status 端点未启用时返回 404 / 启用时不工作 | Task B1: Enabled 条件 + 回归测试 |
| server/status.go 使用 log.Printf | Task B2: 替换为 zerolog |
| lua/api_timer.go 使用 log.Printf | Task B2: 替换为 zerolog |
| proxy.go 的 go:generate 不合理 | Task C: 删除 |

---

## 附录：常用验证命令

```bash
# 关键测试
go test -v -run "TestLoad_" ./internal/config/...
go test -v -run "TestMonitoringEndpoints|TestLocationEngine" ./internal/server/...

# 相关包
go test ./internal/config/... ./internal/server/... ./internal/lua/... ./internal/proxy/...

# 全量
go test ./internal/... -count=1

# Lint + Build
make lint
make build
```
