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ratelimit_middleware.go
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ratelimit_middleware.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
// ------------------------------------------------------------
package ratelimit
import (
"fmt"
"strconv"
"github.com/dapr/components-contrib/middleware"
"github.com/dapr/components-contrib/middleware/http/nethttpadaptor"
"github.com/dapr/dapr/pkg/logger"
"github.com/didip/tollbooth"
"github.com/valyala/fasthttp"
"github.com/valyala/fasthttp/fasthttpadaptor"
)
// Metadata is the ratelimit middleware config
type rateLimitMiddlewareMetadata struct {
MaxRequestsPerSecond float64 `json:"maxRequestsPerSecond"`
}
const (
maxRequestsPerSecondKey = "maxRequestsPerSecond"
// Defaults
defaultMaxRequestsPerSecond = 100
)
// NewRateLimitMiddleware returns a new oAuth2 middleware
func NewRateLimitMiddleware(logger logger.Logger) *Middleware {
return &Middleware{logger: logger}
}
// Middleware is an oAuth2 authentication middleware
type Middleware struct {
logger logger.Logger
}
// GetHandler returns the HTTP handler provided by the middleware
func (m *Middleware) GetHandler(metadata middleware.Metadata) (func(h fasthttp.RequestHandler) fasthttp.RequestHandler, error) {
meta, err := m.getNativeMetadata(metadata)
if err != nil {
return nil, err
}
limiter := tollbooth.NewLimiter(meta.MaxRequestsPerSecond, nil)
return func(h fasthttp.RequestHandler) fasthttp.RequestHandler {
limitHandler := tollbooth.LimitFuncHandler(limiter, nethttpadaptor.NewNetHTTPHandlerFunc(m.logger, h))
wrappedHandler := fasthttpadaptor.NewFastHTTPHandlerFunc(limitHandler.ServeHTTP)
return func(ctx *fasthttp.RequestCtx) {
wrappedHandler(ctx)
}
}, nil
}
func (m *Middleware) getNativeMetadata(metadata middleware.Metadata) (*rateLimitMiddlewareMetadata, error) {
var middlewareMetadata rateLimitMiddlewareMetadata
middlewareMetadata.MaxRequestsPerSecond = defaultMaxRequestsPerSecond
if val, ok := metadata.Properties[maxRequestsPerSecondKey]; ok {
f, err := strconv.ParseFloat(val, 64)
if err != nil {
return nil, fmt.Errorf("error parsing ratelimit middleware property %s: %+v", maxRequestsPerSecondKey, err)
}
if f <= 0 {
return nil, fmt.Errorf("ratelimit middleware property %s must be a positive value", maxRequestsPerSecondKey)
}
middlewareMetadata.MaxRequestsPerSecond = f
}
return &middlewareMetadata, nil
}