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middleware.go
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/
middleware.go
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/*
* Copyright 2023 Wang Min Xiang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package compress
import (
"github.com/aacfactory/errors"
"github.com/aacfactory/fns/transports"
"github.com/aacfactory/logs"
"github.com/valyala/fasthttp"
"slices"
)
type Middleware struct {
log logs.Logger
enable bool
compressor Compressor
gzip *GzipCompressor
deflate *DeflateCompressor
brotli *BrotliCompressor
}
func (middle *Middleware) Name() string {
return "compress"
}
func (middle *Middleware) Construct(options transports.MiddlewareOptions) error {
middle.log = options.Log
config := Config{}
configErr := options.Config.As(&config)
if configErr != nil {
return errors.Warning("fns: construct compress middleware failed").WithCause(configErr)
}
if !config.Enable {
return nil
}
// gzip
gzipLevel := config.GzipLevel
if !slices.Contains([]int{fasthttp.CompressBestSpeed, fasthttp.CompressBestCompression, fasthttp.CompressDefaultCompression, fasthttp.CompressHuffmanOnly}, gzipLevel) {
gzipLevel = fasthttp.CompressDefaultCompression
}
middle.gzip = &GzipCompressor{
level: gzipLevel,
}
// deflate
deflateLevel := config.DeflateLevel
if !slices.Contains([]int{fasthttp.CompressBestSpeed, fasthttp.CompressBestCompression, fasthttp.CompressDefaultCompression, fasthttp.CompressHuffmanOnly}, deflateLevel) {
deflateLevel = fasthttp.CompressDefaultCompression
}
middle.deflate = &DeflateCompressor{
level: deflateLevel,
}
// brotli
brotliLevel := config.BrotliLevel
if !slices.Contains([]int{fasthttp.CompressBrotliBestSpeed, fasthttp.CompressBrotliBestCompression, fasthttp.CompressBrotliDefaultCompression}, brotliLevel) {
brotliLevel = fasthttp.CompressBrotliDefaultCompression
}
switch config.Default {
case BrotliName:
middle.compressor = middle.brotli
break
case DeflateName:
middle.compressor = middle.deflate
break
case GzipName:
middle.compressor = middle.gzip
break
default:
middle.compressor = middle.deflate
break
}
return nil
}
func (middle *Middleware) Handler(next transports.Handler) transports.Handler {
if middle.enable {
return transports.HandlerFunc(func(w transports.ResponseWriter, r transports.Request) {
kind := getKind(r)
switch kind {
case Any, Default:
cw := acquire(w, middle.compressor)
next.Handle(cw, r)
release(cw)
break
case Gzip:
cw := acquire(w, middle.gzip)
next.Handle(cw, r)
release(cw)
break
case Deflate:
cw := acquire(w, middle.deflate)
next.Handle(cw, r)
release(cw)
break
case Brotli:
cw := acquire(w, middle.brotli)
next.Handle(cw, r)
release(cw)
break
default:
next.Handle(w, r)
break
}
})
}
return next
}
func (middle *Middleware) Close() (err error) {
return
}