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limiterphi.go
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/
limiterphi.go
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package limiterphi
import (
"github.com/fate-lovely/phi"
"github.com/ulule/limiter/v3"
"github.com/valyala/fasthttp"
"strconv"
)
// Middleware is the middleware for phi.
type Middleware struct {
Limiter *limiter.Limiter
OnError ErrorHandler
OnLimitReached LimitReachedHandler
KeyGetter KeyGetter
}
// NewMiddleware return a new instance of a phi middleware.
func NewMiddleware(limiter *limiter.Limiter, options ...Option) *Middleware {
middleware := &Middleware{
Limiter: limiter,
OnError: DefaultErrorHandler,
OnLimitReached: DefaultLimitReachedHandler,
KeyGetter: DefaultKeyGetter,
}
for _, option := range options {
option.apply(middleware)
}
return middleware
}
// Handle phi request.
func (middleware *Middleware) Handle(next phi.HandlerFunc) phi.HandlerFunc {
return func(ctx *fasthttp.RequestCtx) {
key := middleware.KeyGetter(ctx)
context, err := middleware.Limiter.Get(ctx, key)
if err != nil {
middleware.OnError(ctx, err)
return
}
ctx.Response.Header.Set("X-RateLimit-Limit", strconv.FormatInt(context.Limit, 10))
ctx.Response.Header.Set("X-RateLimit-Remaining", strconv.FormatInt(context.Remaining, 10))
ctx.Response.Header.Set("X-RateLimit-Reset", strconv.FormatInt(context.Reset, 10))
if context.Reached {
middleware.OnLimitReached(ctx)
return
}
next(ctx)
}
}