github.com/kaydxh/golang@v0.0.131/pkg/middleware/http-middleware/ratelimiter/ratelimiter.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package ratelimit
    23  
    24  import (
    25  	"fmt"
    26  	"net/http"
    27  	"time"
    28  
    29  	rate_ "github.com/kaydxh/golang/go/time/rate"
    30  	logs_ "github.com/kaydxh/golang/pkg/logs"
    31  	"google.golang.org/grpc/codes"
    32  	"google.golang.org/grpc/status"
    33  )
    34  
    35  type Limiter interface {
    36  	Allow() bool
    37  	AllowFor(timeout time.Duration) bool
    38  	Put()
    39  }
    40  
    41  type RateLimiter struct {
    42  	Limiter
    43  }
    44  
    45  /*
    46  func LimitAll(burst int) http.Handler {
    47  	limiter := rate_.NewLimiter(burst)
    48  	rl := &RateLimiter{
    49  		Limiter: limiter,
    50  	}
    51  	h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
    52  	return rl.Handler(h)
    53  }
    54  */
    55  
    56  func LimitAll(burst int) *RateLimiter {
    57  	limiter := rate_.NewLimiter(burst)
    58  	rl := &RateLimiter{
    59  		Limiter: limiter,
    60  	}
    61  	//h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})
    62  	return rl
    63  }
    64  
    65  func (l *RateLimiter) Handler(handler http.Handler) http.Handler {
    66  	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    67  		if !l.Allow() {
    68  			logger := logs_.GetLogger(r.Context())
    69  			err := status.Errorf(
    70  				codes.ResourceExhausted,
    71  				"%s is rejected by http_ratelimit middleware, please retry later.",
    72  				fmt.Sprintf("%s %s", r.Method, r.URL.Path),
    73  			)
    74  			logger.Errorf("%v", err.Error())
    75  			return
    76  		}
    77  		defer l.Put()
    78  
    79  		handler.ServeHTTP(w, r)
    80  	})
    81  }