54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
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package model
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import (
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"encoding/json"
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"go-common/library/ecode"
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xtime "go-common/library/time"
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"time"
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)
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const (
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// MaxInt64 用于最大int64
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MaxInt64 = int64(^uint64(0) >> 1)
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// UserListLen 空间长度
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UserListLen = 20
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)
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// Cache
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const (
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CacheKeyUserBase = "user_base:%d" //用户基本信息缓存key
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CacheExpireUserBase = 600
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)
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// CursorValue 用于cursor的定位，这里可以当做通用结构使用，使用者自己根据需求定义cursor_id的含义
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type CursorValue struct {
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CursorID int64 `json:"cursor_id"`
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CursorTime xtime.Time `json:"cursor_time"`
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}
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// ParseCursor 从cursor_prev和cursor_next，判断请求的方向，以及生成cursor
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func ParseCursor(cursorPrev string, cursorNext string) (cursor CursorValue, directionNext bool, err error) {
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// 判断是向前还是向后查询
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directionNext = true
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cursorStr := cursorNext
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if len(cursorNext) == 0 && len(cursorPrev) > 0 {
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directionNext = false
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cursorStr = cursorPrev
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}
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// 解析cursor中的cursor_id
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if len(cursorStr) != 0 {
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var cursorData = []byte(cursorStr)
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err = json.Unmarshal(cursorData, &cursor)
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if err != nil {
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err = ecode.ReqParamErr
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return
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}
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}
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// 第一次请求的时候，携带的svid=0，需要转成max传给dao层
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if directionNext && cursor.CursorID == 0 {
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cursor.CursorID = MaxInt64
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cursor.CursorTime = xtime.Time(time.Now().Unix())
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}
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return
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}
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