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47 lines
1.0 KiB
47 lines
1.0 KiB
package ratelimit
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import (
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"context"
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"github.com/go-kratos/kratos/v2/errors"
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"github.com/go-kratos/kratos/v2/middleware"
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"github.com/go-kratos/sra/ratelimit"
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"github.com/go-kratos/sra/ratelimit/bbr"
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)
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type Option func(*options)
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// WithLimiter set Limiter implementation,
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// default is bbr limiter
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func WithLimiter(limiter ratelimit.Limiter) Option {
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return func(o *options) {
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o.limiter = limiter
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}
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}
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type options struct {
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limiter ratelimit.Limiter
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}
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// Server ratelimiter middleware
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func Server(opts ...Option) middleware.Middleware {
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options := &options{
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limiter: bbr.NewLimiter(),
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}
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for _, o := range opts {
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o(options)
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}
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return func(handler middleware.Handler) middleware.Handler {
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return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
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done, e := options.limiter.Allow()
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if e != nil {
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// rejected
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return nil, errors.New(429, "RATELIMIT", "service unavailable due to rate limit exceeded")
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}
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// allowed
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reply, err = handler(ctx, req)
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done(ratelimit.DoneInfo{Err: err})
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return
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}
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}
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}
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