重构：统一使用索引（Index）替代位置（Position）进行状态判断
## 主要变更 ### 架构改进 - 明确索引（Index）与偏移（Offset）的职责分离 - Index: 记录序号（逻辑概念），用于状态判断 - Offset: 文件字节位置（物理概念），仅用于 I/O 操作 ### API 变更 - 删除所有 Position 相关方法： - `LogCursor.StartPos()/EndPos()` - `LogTailer.GetStartPos()/GetEndPos()` - `TopicProcessor.GetProcessingPosition()/GetReadPosition()` - `Seqlog.GetProcessingPosition()/GetReadPosition()` - 新增索引方法： - `LogCursor.StartIndex()/EndIndex()` - `LogTailer.GetStartIndex()/GetEndIndex()` - `TopicProcessor.GetProcessingIndex()/GetReadIndex()` - `Seqlog.GetProcessingIndex()/GetReadIndex()` - `Seqlog.GetProcessor()` - 获取 processor 实例以访问 Index ### 查询接口变更 - `RecordQuery.QueryOldest(startIndex, count, startIdx, endIdx)` - 使用索引参数 - `RecordQuery.QueryNewest(endIndex, count, startIdx, endIdx)` - 使用索引参数 - `RecordQuery.QueryAt(position, direction, count, startIdx, endIdx)` - startIdx/endIdx 用于状态判断 ### 性能优化 - 状态判断改用整数比较，不再需要计算偏移量 - 减少不必要的索引到偏移的转换 - 只在实际文件 I/O 时才获取 offset ### 测试更新 - 更新所有测试用例使用新的 Index API - 更新示例代码（topic_processor_example.go, webapp/main.go） 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
65
example/webapp/README.md
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65
example/webapp/README.md
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# Seqlog Web 演示
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一个简单的 Web 应用，展示 Seqlog 的实际使用场景。
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## 功能
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### 后端模拟业务
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- 每 2 秒自动生成业务日志
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- 随机生成不同 topic（app、api、database、cache）
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- 随机生成不同操作（查询、插入、更新、删除、备份、恢复、同步等）
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- **随机日志大小**（2KB ~ 10MB）：
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- 80% 小日志（2KB - 100KB）
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- 15% 中日志（100KB - 1MB）
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- 5% 大日志（1MB - 10MB）
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### Web 查询界面
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- 查看所有 topics
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- 查看每个 topic 的统计信息（显示实际字节数）
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- 查询日志（支持向前/向后翻页）
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- 实时自动刷新
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- 日志状态标注（已处理/处理中/待处理）
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## 快速启动
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```bash
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cd example/webapp
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go run main.go
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```
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访问: http://localhost:8080
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## 使用说明
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1. **选择 Topic**: 点击左侧的 topic 列表
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2. **查看统计**: 左侧会显示该 topic 的统计信息（包括总字节数）
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3. **查看日志**: 右侧显示日志内容，带状态标注
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4. **刷新**: 点击"刷新日志"按钮或等待自动刷新
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5. **翻页**: 使用"向前翻页"和"向后翻页"按钮
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6. **自定义范围**: 修改显示范围的数字，控制查询条数
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## 界面说明
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- **绿色边框**: 已处理的日志
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- **黄色边框**: 正在处理的日志
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- **灰色边框**: 待处理的日志
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## 性能测试
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由于日志大小范围很大（2KB ~ 10MB），可以观察到：
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- 小日志处理速度很快
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- 大日志会占用更多存储空间
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- 统计信息会显示真实的字节数增长
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## API 接口
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- `GET /api/topics` - 获取所有 topics
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- `GET /api/stats?topic=<name>` - 获取统计信息
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- `GET /api/query?topic=<name>&backward=10&forward=10` - 查询日志
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- `POST /api/write` - 手动写入日志
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## 技术栈
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- 后端: Go + Seqlog
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- 前端: 原生 HTML/CSS/JavaScript
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- 无需额外依赖
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634
example/webapp/main.go
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example/webapp/main.go
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package main
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import (
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"encoding/json"
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"fmt"
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"log/slog"
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"math/rand"
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"net/http"
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"os"
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"strconv"
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"sync"
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"time"
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"code.tczkiot.com/seqlog"
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)
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var (
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seq *seqlog.Seqlog
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logger *slog.Logger
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queryCache = make(map[string]*seqlog.RecordQuery)
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queryCacheMu sync.RWMutex
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)
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func main() {
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// 初始化
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logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
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Level: slog.LevelInfo,
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}))
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// 创建 Seqlog
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seq = seqlog.NewSeqlog("logs", logger, func(topic string, rec *seqlog.Record) error {
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// 简单的日志处理：只打印摘要信息
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dataPreview := string(rec.Data)
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if len(dataPreview) > 100 {
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dataPreview = dataPreview[:100] + "..."
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}
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logger.Info("处理日志", "topic", topic, "size", len(rec.Data), "preview", dataPreview)
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return nil
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})
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if err := seq.Start(); err != nil {
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logger.Error("启动失败", "error", err)
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os.Exit(1)
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}
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defer seq.Stop()
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logger.Info("Seqlog 已启动")
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// 启动后台业务模拟
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go simulateBusiness()
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// 启动 Web 服务器
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http.HandleFunc("/", handleIndex)
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http.HandleFunc("/api/topics", handleTopics)
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http.HandleFunc("/api/stats", handleStats)
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http.HandleFunc("/api/query", handleQuery)
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http.HandleFunc("/api/write", handleWrite)
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addr := ":8080"
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logger.Info("Web 服务器启动", "地址", "http://localhost"+addr)
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if err := http.ListenAndServe(addr, nil); err != nil {
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logger.Error("服务器错误", "error", err)
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}
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}
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// 模拟业务写日志
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func simulateBusiness() {
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topics := []string{"app", "api", "database", "cache"}
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actions := []string{"查询", "插入", "更新", "删除", "连接", "断开", "备份", "恢复", "同步"}
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status := []string{"成功", "失败", "超时", "重试"}
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ticker := time.NewTicker(2 * time.Second)
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defer ticker.Stop()
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for range ticker.C {
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// 随机选择 topic 和内容
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topic := topics[rand.Intn(len(topics))]
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action := actions[rand.Intn(len(actions))]
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st := status[rand.Intn(len(status))]
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// 随机生成日志大小：2KB 到 10MB
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// 80% 概率生成小日志（2KB-100KB）
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// 15% 概率生成中日志（100KB-1MB）
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// 5% 概率生成大日志（1MB-10MB）
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var logSize int
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prob := rand.Intn(100)
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if prob < 80 {
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// 2KB - 100KB
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logSize = 2*1024 + rand.Intn(98*1024)
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} else if prob < 95 {
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// 100KB - 1MB
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logSize = 100*1024 + rand.Intn(924*1024)
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} else {
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// 1MB - 10MB
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logSize = 1024*1024 + rand.Intn(9*1024*1024)
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}
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// 生成日志内容
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header := fmt.Sprintf("[%s] %s %s - 用时: %dms | 数据大小: %s | ",
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time.Now().Format("15:04:05"),
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action,
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st,
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rand.Intn(1000),
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formatBytes(int64(logSize)))
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// 填充随机数据到指定大小
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data := make([]byte, logSize)
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copy(data, []byte(header))
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// 填充可读的模拟数据
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fillOffset := len(header)
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patterns := []string{
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"user_id=%d, session=%x, ip=%d.%d.%d.%d, ",
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"query_time=%dms, rows=%d, cached=%v, ",
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"error_code=%d, retry_count=%d, ",
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"request_id=%x, trace_id=%x, ",
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}
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for fillOffset < logSize-100 {
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pattern := patterns[rand.Intn(len(patterns))]
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var chunk string
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switch pattern {
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case patterns[0]:
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chunk = fmt.Sprintf(pattern, rand.Intn(10000), rand.Intn(0xFFFFFF),
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rand.Intn(256), rand.Intn(256), rand.Intn(256), rand.Intn(256))
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case patterns[1]:
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chunk = fmt.Sprintf(pattern, rand.Intn(1000), rand.Intn(10000), rand.Intn(2) == 1)
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case patterns[2]:
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chunk = fmt.Sprintf(pattern, rand.Intn(500), rand.Intn(5))
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case patterns[3]:
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chunk = fmt.Sprintf(pattern, rand.Intn(0xFFFFFFFF), rand.Intn(0xFFFFFFFF))
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}
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remaining := logSize - fillOffset
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if len(chunk) > remaining {
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chunk = chunk[:remaining]
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}
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copy(data[fillOffset:], []byte(chunk))
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fillOffset += len(chunk)
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}
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// 写入日志
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if _, err := seq.Write(topic, data); err != nil {
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logger.Error("写入日志失败", "error", err, "size", logSize)
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} else {
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logger.Info("写入日志", "topic", topic, "size", formatBytes(int64(logSize)))
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}
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}
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}
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func formatBytes(bytes int64) string {
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if bytes < 1024 {
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return fmt.Sprintf("%d B", bytes)
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}
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if bytes < 1024*1024 {
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return fmt.Sprintf("%.1f KB", float64(bytes)/1024)
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}
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return fmt.Sprintf("%.2f MB", float64(bytes)/1024/1024)
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}
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// 首页
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func handleIndex(w http.ResponseWriter, r *http.Request) {
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html := `<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Seqlog 日志查询</title>
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<style>
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body {
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font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
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max-width: 1400px;
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margin: 0 auto;
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padding: 20px;
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background: #f5f5f5;
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}
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.header {
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background: white;
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padding: 20px;
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border-radius: 8px;
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margin-bottom: 20px;
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box-shadow: 0 2px 4px rgba(0,0,0,0.1);
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}
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h1 {
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margin: 0;
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color: #333;
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}
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.subtitle {
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color: #666;
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margin-top: 5px;
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}
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.container {
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display: grid;
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grid-template-columns: 250px 1fr;
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gap: 20px;
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}
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.sidebar {
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background: white;
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padding: 20px;
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border-radius: 8px;
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box-shadow: 0 2px 4px rgba(0,0,0,0.1);
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}
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.main {
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background: white;
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padding: 20px;
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border-radius: 8px;
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box-shadow: 0 2px 4px rgba(0,0,0,0.1);
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}
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.topic-list {
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list-style: none;
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padding: 0;
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margin: 0;
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}
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.topic-item {
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padding: 10px;
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margin-bottom: 5px;
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cursor: pointer;
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border-radius: 4px;
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transition: background 0.2s;
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}
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.topic-item:hover {
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background: #f0f0f0;
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}
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.topic-item.active {
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background: #007bff;
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color: white;
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}
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.stats {
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margin-top: 20px;
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padding: 15px;
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background: #f8f9fa;
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border-radius: 4px;
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}
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.stat-item {
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display: flex;
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justify-content: space-between;
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margin-bottom: 8px;
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font-size: 14px;
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}
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.controls {
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margin-bottom: 20px;
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}
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.btn {
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padding: 8px 16px;
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margin-right: 10px;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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font-size: 14px;
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}
|
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.btn-primary {
|
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background: #007bff;
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color: white;
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}
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.btn-secondary {
|
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background: #6c757d;
|
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color: white;
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}
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.log-container {
|
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height: 500px;
|
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overflow-y: auto;
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border: 1px solid #ddd;
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border-radius: 4px;
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padding: 10px;
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background: #f8f9fa;
|
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font-family: 'Courier New', monospace;
|
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font-size: 13px;
|
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}
|
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.log-entry {
|
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padding: 6px 10px;
|
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margin-bottom: 4px;
|
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background: white;
|
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border-left: 3px solid #007bff;
|
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border-radius: 2px;
|
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word-wrap: break-word;
|
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overflow-wrap: break-word;
|
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display: -webkit-box;
|
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-webkit-line-clamp: 3;
|
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-webkit-box-orient: vertical;
|
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overflow: hidden;
|
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line-height: 1.5;
|
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}
|
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.log-entry.processed {
|
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border-left-color: #28a745;
|
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opacity: 0.8;
|
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}
|
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.log-entry.processing {
|
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border-left-color: #ffc107;
|
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background: #fff9e6;
|
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}
|
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.log-entry.pending {
|
||||
border-left-color: #6c757d;
|
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opacity: 0.6;
|
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}
|
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.status-badge {
|
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display: inline-block;
|
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padding: 2px 8px;
|
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border-radius: 3px;
|
||||
font-size: 11px;
|
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margin-right: 8px;
|
||||
}
|
||||
.status-processed {
|
||||
background: #d4edda;
|
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color: #155724;
|
||||
}
|
||||
.status-processing {
|
||||
background: #fff3cd;
|
||||
color: #856404;
|
||||
}
|
||||
.status-pending {
|
||||
background: #e2e3e5;
|
||||
color: #383d41;
|
||||
}
|
||||
.loading {
|
||||
text-align: center;
|
||||
padding: 20px;
|
||||
color: #666;
|
||||
}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<div class="header">
|
||||
<h1>Seqlog 日志查询系统</h1>
|
||||
<div class="subtitle">实时查看和管理应用日志</div>
|
||||
</div>
|
||||
|
||||
<div class="container">
|
||||
<div class="sidebar">
|
||||
<h3>Topics</h3>
|
||||
<ul class="topic-list" id="topicList"></ul>
|
||||
|
||||
<div class="stats" id="stats">
|
||||
<h4>统计信息</h4>
|
||||
<div id="statsContent">选择一个 topic 查看统计</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div class="main">
|
||||
<div class="controls">
|
||||
<button class="btn btn-primary" onclick="loadLogs()">刷新日志</button>
|
||||
<button class="btn btn-secondary" onclick="queryBackward()">向前翻页</button>
|
||||
<button class="btn btn-secondary" onclick="queryForward()">向后翻页</button>
|
||||
<span style="margin-left: 20px;">显示范围: 前 <input type="number" id="backwardCount" value="10" style="width: 60px;"> 条, 后 <input type="number" id="forwardCount" value="10" style="width: 60px;"> 条</span>
|
||||
</div>
|
||||
|
||||
<div class="log-container" id="logContainer">
|
||||
<div class="loading">选择一个 topic 开始查看日志</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<script>
|
||||
let currentTopic = null;
|
||||
let displayedOffsets = new Set(); // 追踪已显示的日志偏移量
|
||||
|
||||
// 加载 topics
|
||||
async function loadTopics() {
|
||||
const response = await fetch('/api/topics');
|
||||
const topics = await response.json();
|
||||
|
||||
const list = document.getElementById('topicList');
|
||||
list.innerHTML = topics.map(topic =>
|
||||
'<li class="topic-item" onclick="selectTopic(\'' + topic + '\')">' + topic + '</li>'
|
||||
).join('');
|
||||
}
|
||||
|
||||
// 选择 topic
|
||||
function selectTopic(topic) {
|
||||
currentTopic = topic;
|
||||
displayedOffsets.clear(); // 切换 topic 时清空已显示记录
|
||||
|
||||
// 更新选中状态
|
||||
document.querySelectorAll('.topic-item').forEach(item => {
|
||||
item.classList.remove('active');
|
||||
if (item.textContent === topic) {
|
||||
item.classList.add('active');
|
||||
}
|
||||
});
|
||||
|
||||
// 清空容器并重新加载
|
||||
document.getElementById('logContainer').innerHTML = '';
|
||||
loadStats(topic);
|
||||
loadLogs();
|
||||
}
|
||||
|
||||
// 加载统计
|
||||
async function loadStats(topic) {
|
||||
const response = await fetch('/api/stats?topic=' + topic);
|
||||
const stats = await response.json();
|
||||
|
||||
const content = document.getElementById('statsContent');
|
||||
content.innerHTML =
|
||||
'<div class="stat-item"><span>写入:</span><span>' + stats.write_count + ' 条</span></div>' +
|
||||
'<div class="stat-item"><span>处理:</span><span>' + stats.processed_count + ' 条</span></div>' +
|
||||
'<div class="stat-item"><span>错误:</span><span>' + stats.error_count + ' 次</span></div>' +
|
||||
'<div class="stat-item"><span>大小:</span><span>' + formatBytes(stats.write_bytes) + '</span></div>';
|
||||
}
|
||||
|
||||
// 加载日志
|
||||
async function loadLogs() {
|
||||
if (!currentTopic) return;
|
||||
|
||||
const backward = document.getElementById('backwardCount').value;
|
||||
const forward = document.getElementById('forwardCount').value;
|
||||
|
||||
const response = await fetch('/api/query?topic=' + currentTopic +
|
||||
'&backward=' + backward + '&forward=' + forward);
|
||||
const data = await response.json();
|
||||
|
||||
const container = document.getElementById('logContainer');
|
||||
|
||||
if (data.records.length === 0 && displayedOffsets.size === 0) {
|
||||
container.innerHTML = '<div class="loading">暂无日志</div>';
|
||||
return;
|
||||
}
|
||||
|
||||
// 过滤出新记录
|
||||
const newRecords = data.records.filter(r => !displayedOffsets.has(r.offset));
|
||||
|
||||
if (newRecords.length > 0) {
|
||||
// 生成新记录的 HTML
|
||||
const newHTML = newRecords.map(r => {
|
||||
displayedOffsets.add(r.offset); // 标记为已显示
|
||||
|
||||
// 解析状态，处理可能的状态值
|
||||
let statusClass = 'pending';
|
||||
let statusText = '待处理';
|
||||
let badgeClass = 'status-pending';
|
||||
|
||||
if (r.status === 'StatusProcessed' || r.status === 'processed') {
|
||||
statusClass = 'processed';
|
||||
statusText = '已处理';
|
||||
badgeClass = 'status-processed';
|
||||
} else if (r.status === 'StatusProcessing' || r.status === 'processing') {
|
||||
statusClass = 'processing';
|
||||
statusText = '处理中';
|
||||
badgeClass = 'status-processing';
|
||||
}
|
||||
|
||||
return '<div class="log-entry ' + statusClass + '" data-offset="' + r.offset + '">' +
|
||||
'<span class="status-badge ' + badgeClass + '">' + statusText + '</span>' +
|
||||
r.data +
|
||||
'</div>';
|
||||
}).join('');
|
||||
|
||||
// 追加新记录
|
||||
container.innerHTML += newHTML;
|
||||
|
||||
// 自动滚动到底部
|
||||
container.scrollTop = container.scrollHeight;
|
||||
}
|
||||
}
|
||||
|
||||
function queryBackward() {
|
||||
loadLogs();
|
||||
}
|
||||
|
||||
function queryForward() {
|
||||
loadLogs();
|
||||
}
|
||||
|
||||
function formatBytes(bytes) {
|
||||
if (bytes < 1024) return bytes + ' B';
|
||||
if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
|
||||
return (bytes / 1024 / 1024).toFixed(1) + ' MB';
|
||||
}
|
||||
|
||||
// 初始化
|
||||
loadTopics();
|
||||
// 不再自动刷新 topics 列表
|
||||
setInterval(() => {
|
||||
if (currentTopic) {
|
||||
loadStats(currentTopic);
|
||||
loadLogs();
|
||||
}
|
||||
}, 3000); // 每 3 秒刷新日志
|
||||
</script>
|
||||
</body>
|
||||
</html>`
|
||||
|
||||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||||
fmt.Fprint(w, html)
|
||||
}
|
||||
|
||||
// API: 获取所有 topics
|
||||
func handleTopics(w http.ResponseWriter, r *http.Request) {
|
||||
topics := seq.GetTopics()
|
||||
json.NewEncoder(w).Encode(topics)
|
||||
}
|
||||
|
||||
// API: 获取统计信息
|
||||
func handleStats(w http.ResponseWriter, r *http.Request) {
|
||||
topic := r.URL.Query().Get("topic")
|
||||
if topic == "" {
|
||||
http.Error(w, "缺少 topic 参数", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
stats, err := seq.GetTopicStats(topic)
|
||||
if err != nil {
|
||||
http.Error(w, err.Error(), http.StatusNotFound)
|
||||
return
|
||||
}
|
||||
|
||||
json.NewEncoder(w).Encode(stats)
|
||||
}
|
||||
|
||||
// API: 查询日志
|
||||
func handleQuery(w http.ResponseWriter, r *http.Request) {
|
||||
topic := r.URL.Query().Get("topic")
|
||||
if topic == "" {
|
||||
http.Error(w, "缺少 topic 参数", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
backward, _ := strconv.Atoi(r.URL.Query().Get("backward"))
|
||||
forward, _ := strconv.Atoi(r.URL.Query().Get("forward"))
|
||||
|
||||
if backward == 0 {
|
||||
backward = 10
|
||||
}
|
||||
if forward == 0 {
|
||||
forward = 10
|
||||
}
|
||||
|
||||
// 从缓存中获取或创建 query 对象
|
||||
queryCacheMu.Lock()
|
||||
query, exists := queryCache[topic]
|
||||
if !exists {
|
||||
var err error
|
||||
query, err = seq.NewTopicQuery(topic)
|
||||
if err != nil {
|
||||
queryCacheMu.Unlock()
|
||||
http.Error(w, err.Error(), http.StatusNotFound)
|
||||
return
|
||||
}
|
||||
queryCache[topic] = query
|
||||
}
|
||||
queryCacheMu.Unlock()
|
||||
|
||||
// 获取当前处理索引和读取索引
|
||||
startIdx := seq.GetProcessingIndex(topic)
|
||||
endIdx := seq.GetReadIndex(topic)
|
||||
|
||||
// 获取索引用于转换
|
||||
processor, err := seq.GetProcessor(topic)
|
||||
if err != nil {
|
||||
http.Error(w, err.Error(), http.StatusNotFound)
|
||||
return
|
||||
}
|
||||
index := processor.Index()
|
||||
|
||||
// 合并查询结果：向后 + 当前 + 向前
|
||||
var results []*seqlog.RecordWithStatus
|
||||
|
||||
// 向后查询
|
||||
if backward > 0 && startIdx > 0 {
|
||||
startPos, err := index.GetOffset(startIdx)
|
||||
if err == nil {
|
||||
backResults, err := query.QueryAt(startPos, -1, backward, startIdx, endIdx)
|
||||
if err == nil {
|
||||
results = append(results, backResults...)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 当前位置
|
||||
if startIdx < endIdx {
|
||||
startPos, err := index.GetOffset(startIdx)
|
||||
if err == nil {
|
||||
currentResults, err := query.QueryAt(startPos, 0, 1, startIdx, endIdx)
|
||||
if err == nil {
|
||||
results = append(results, currentResults...)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 向前查询
|
||||
if forward > 0 {
|
||||
startPos, err := index.GetOffset(startIdx)
|
||||
if err == nil {
|
||||
forwardResults, err := query.QueryAt(startPos, 1, forward, startIdx, endIdx)
|
||||
if err == nil {
|
||||
results = append(results, forwardResults...)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type Record struct {
|
||||
Status string `json:"status"`
|
||||
Data string `json:"data"`
|
||||
}
|
||||
|
||||
records := make([]Record, len(results))
|
||||
for i, r := range results {
|
||||
records[i] = Record{
|
||||
Status: r.Status.String(),
|
||||
Data: string(r.Record.Data),
|
||||
}
|
||||
}
|
||||
|
||||
json.NewEncoder(w).Encode(map[string]interface{}{
|
||||
"records": records,
|
||||
"total": len(records),
|
||||
})
|
||||
}
|
||||
|
||||
// API: 手动写入日志
|
||||
func handleWrite(w http.ResponseWriter, r *http.Request) {
|
||||
if r.Method != "POST" {
|
||||
http.Error(w, "只支持 POST", http.StatusMethodNotAllowed)
|
||||
return
|
||||
}
|
||||
|
||||
var req struct {
|
||||
Topic string `json:"topic"`
|
||||
Data string `json:"data"`
|
||||
}
|
||||
|
||||
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
|
||||
http.Error(w, err.Error(), http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
offset, err := seq.Write(req.Topic, []byte(req.Data))
|
||||
if err != nil {
|
||||
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
json.NewEncoder(w).Encode(map[string]interface{}{
|
||||
"success": true,
|
||||
"offset": offset,
|
||||
})
|
||||
}
|
||||
Reference in New Issue
Block a user