初始化2

server/utils/log_buffer.go

@@ -0,0 +1,103 @@
+package utils
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"sync"
+	"time"
+)
+
+// LogEntry 日志条目
+type LogEntry struct {
+	Time    time.Time `json:"time"`
+	Level   string    `json:"level"`
+	Message string    `json:"message"`
+}
+
+// LogBuffer 环形日志缓冲区
+type LogBuffer struct {
+	mu      sync.RWMutex
+	entries []LogEntry
+	maxSize int
+	writer  io.Writer // 原始输出(控制台)
+}
+
+var LogBuf = NewLogBuffer(2000)
+
+func NewLogBuffer(maxSize int) *LogBuffer {
+	return &LogBuffer{
+		entries: make([]LogEntry, 0, maxSize),
+		maxSize: maxSize,
+		writer:  os.Stderr,
+	}
+}
+
+// Write 实现 io.Writer 接口, 用于 log.SetOutput
+func (b *LogBuffer) Write(p []byte) (n int, err error) {
+	// 写入原始输出
+	b.writer.Write(p)
+
+	msg := string(p)
+	level := "INFO"
+	switch {
+	case contains(msg, "FAIL") || contains(msg, "Error") || contains(msg, "error"):
+		level = "ERROR"
+	case contains(msg, "WARN") || contains(msg, "warn"):
+		level = "WARN"
+	}
+
+	b.mu.Lock()
+	b.entries = append(b.entries, LogEntry{
+		Time:    time.Now(),
+		Level:   level,
+		Message: msg,
+	})
+	// 超过上限则截掉前半部分
+	if len(b.entries) > b.maxSize {
+		b.entries = b.entries[len(b.entries)-b.maxSize:]
+	}
+	b.mu.Unlock()
+
+	return len(p), nil
+}
+
+// Get 获取最近 n 条日志
+func (b *LogBuffer) Get(n int) []LogEntry {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+
+	total := len(b.entries)
+	if n <= 0 || n > total {
+		n = total
+	}
+	result := make([]LogEntry, n)
+	copy(result, b.entries[total-n:])
+	return result
+}
+
+// Count 日志总数
+func (b *LogBuffer) Count() int {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+	return len(b.entries)
+}
+
+func contains(s, sub string) bool {
+	return len(s) >= len(sub) && (s == sub || len(s) > 0 && findSubstring(s, sub))
+}
+
+func findSubstring(s, sub string) bool {
+	for i := 0; i <= len(s)-len(sub); i++ {
+		if s[i:i+len(sub)] == sub {
+			return true
+		}
+	}
+	return false
+}
+
+// Logf 写入一条格式化日志到缓冲区
+func Logf(format string, args ...interface{}) {
+	msg := fmt.Sprintf(format, args...)
+	LogBuf.Write([]byte(msg + "\n"))
+}