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package service
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import (
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"context"
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"math/rand"
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pb "verifyCode/api/verifyCode"
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)
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type VerifyCodeService struct {
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pb.UnimplementedVerifyCodeServer
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}
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// 构造器
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func NewVerifyCodeService() *VerifyCodeService {
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return &VerifyCodeService{}
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}
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func (s *VerifyCodeService) GetVerifyCode(ctx context.Context, req *pb.GetVerifyCodeRequest) (*pb.GetVerifyCodeReply, error) {
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return &pb.GetVerifyCodeReply{
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Code: RandCode(int(req.Length), req.Type),
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}, nil
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}
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func RandCode(l int, r pb.TYPE) string {
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switch r {
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case pb.TYPE_DEFAULT:
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fallthrough
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case pb.TYPE_DIGIT:
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return randcode("0123456789", l, 4)
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case pb.TYPE_LETTRE:
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return randcode("abcdefghigklmnopqrstuvwxyz", l, 5)
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case pb.TYPE_MIXED:
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return randcode("0123456789abcdefghigklmnopqrstuvwxyz", l, 6)
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default:
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return ""
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}
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}
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// 随机数和新方法：优化实现
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// 一次随机多次使用，分部分多次使用
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func randcode(chars string, l, idxBits int) string {
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//计算有效的二进制数，基于char的长度
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//推荐写死，chars固定，idxBits固定
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//形成掩码。mask
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//例如，使用低六位：00000000000111111
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idxMask := 1<<idxBits - 1 //00001000000 - 1 = 00000111111
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//63位可以使用多少次
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idxMax := 63 / idxBits
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//结果
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result := make([]byte, l)
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//生成随机数
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//cache:随机位缓存
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//remain:还可以用多少次
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for i, cache, remain := 0, rand.Int63(), idxMax; i < l; {
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if remain == 0 {
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cache, remain = rand.Int63(), idxMax
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}
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//利用掩码获取有效位的随机数
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if randIndex := int(cache & int64(idxMask)); randIndex < len(chars) {
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result[i] = chars[randIndex]
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i++
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}
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//使用下一组随即位
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cache >>= idxBits
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//减少一次使用次数
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remain--
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}
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return string(result)
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}
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// 随机的核心方法:简单实现
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//func randcode(chars string, l int) string {
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// charsLen := len(chars)
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// result := make([]byte, l)
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// for i := 0; i < l; i++ {
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// randIndex := rand.Intn(charsLen)
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// result[i] = chars[randIndex]
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// }
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// return string(result)
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//}
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