44 lines
1.6 KiB
Go
44 lines
1.6 KiB
Go
package service
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import (
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"crypto/md5"
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"crypto/sha256"
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"encoding/hex"
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"regexp"
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"strings"
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)
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var (
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reUUID = regexp.MustCompile(`[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}`)
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reISOTime = regexp.MustCompile(`\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[+-]\d{2}:?\d{2})?`)
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reUnixMs = regexp.MustCompile(`\b1[4-9]\d{12}\b`) // unix 毫秒级时间戳
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reRequestID = regexp.MustCompile(`\b(req[-_]?|request[-_]?|rid[-_:]?)[-_:]?[0-9a-zA-Z-]{4,}\b`)
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reLongNum = regexp.MustCompile(`\b\d{4,}\b`) // 连续≥4位数字
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)
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// normalizeErrorMsg 归一化错误消息：剔除易变片段（UUID/时间戳/请求ID/连续数字），
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// 使同因不同实例的错误命中同一记忆键。
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func normalizeErrorMsg(msg string) string {
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m := msg
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m = reUUID.ReplaceAllString(m, "{uuid}")
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m = reISOTime.ReplaceAllString(m, "{time}")
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m = reUnixMs.ReplaceAllString(m, "{ts}")
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m = reRequestID.ReplaceAllString(m, "{reqid}")
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m = reLongNum.ReplaceAllString(m, "{num}")
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return strings.TrimSpace(m)
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}
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// buildMemoryKey 构造记忆键 = SHA-256(upstream|error_code|归一化消息)。
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// 含失败上游维度：不同上游的同类错误互不串扰。
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func buildMemoryKey(upstream, code, msg string) string {
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raw := strings.Join([]string{upstream, code, normalizeErrorMsg(msg)}, "|")
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sum := sha256.Sum256([]byte(raw))
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return hex.EncodeToString(sum[:])
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}
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// msgFingerprint 归一化消息的 md5（观测/展示用）。
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func msgFingerprint(msg string) string {
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sum := md5.Sum([]byte(normalizeErrorMsg(msg)))
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return hex.EncodeToString(sum[:])
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}
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