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setup.go
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setup.go
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// Copyright 2015 Light Code Labs, LLC
//
// 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 gzip
import (
"compress/gzip"
"fmt"
"io/ioutil"
"strconv"
"strings"
"sync"
"github.com/mholt/caddy"
"github.com/mholt/caddy/caddyhttp/httpserver"
)
// setup configures a new gzip middleware instance.
func setup(c *caddy.Controller) error {
configs, err := gzipParse(c)
if err != nil {
return err
}
httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
return Gzip{Next: next, Configs: configs}
})
return nil
}
func gzipParse(c *caddy.Controller) ([]Config, error) {
var configs []Config
for c.Next() {
config := Config{}
// Request Filters
pathFilter := PathFilter{IgnoredPaths: make(Set)}
extFilter := ExtFilter{Exts: make(Set)}
// Response Filters
lengthFilter := LengthFilter(0)
// No extra args expected
if len(c.RemainingArgs()) > 0 {
return configs, c.ArgErr()
}
for c.NextBlock() {
switch c.Val() {
case "ext":
exts := c.RemainingArgs()
if len(exts) == 0 {
return configs, c.ArgErr()
}
for _, e := range exts {
if !strings.HasPrefix(e, ".") && e != ExtWildCard && e != "" {
return configs, fmt.Errorf(`gzip: invalid extension "%v" (must start with dot)`, e)
}
extFilter.Exts.Add(e)
}
case "not":
paths := c.RemainingArgs()
if len(paths) == 0 {
return configs, c.ArgErr()
}
for _, p := range paths {
if p == "/" {
return configs, fmt.Errorf(`gzip: cannot exclude path "/" - remove directive entirely instead`)
}
if !strings.HasPrefix(p, "/") {
return configs, fmt.Errorf(`gzip: invalid path "%v" (must start with /)`, p)
}
pathFilter.IgnoredPaths.Add(p)
}
case "level":
if !c.NextArg() {
return configs, c.ArgErr()
}
level, _ := strconv.Atoi(c.Val())
config.Level = level
case "min_length":
if !c.NextArg() {
return configs, c.ArgErr()
}
length, err := strconv.ParseInt(c.Val(), 10, 64)
if err != nil {
return configs, err
} else if length == 0 {
return configs, fmt.Errorf(`gzip: min_length must be greater than 0`)
}
lengthFilter = LengthFilter(length)
default:
return configs, c.ArgErr()
}
}
// Request Filters
config.RequestFilters = []RequestFilter{}
// If ignored paths are specified, put in front to filter with path first
if len(pathFilter.IgnoredPaths) > 0 {
config.RequestFilters = []RequestFilter{pathFilter}
}
// Then, if extensions are specified, use those to filter.
// Otherwise, use default extensions filter.
if len(extFilter.Exts) > 0 {
config.RequestFilters = append(config.RequestFilters, extFilter)
} else {
config.RequestFilters = append(config.RequestFilters, DefaultExtFilter())
}
config.ResponseFilters = append(config.ResponseFilters, SkipCompressedFilter{})
// Response Filters
// If min_length is specified, use it.
if int64(lengthFilter) != 0 {
config.ResponseFilters = append(config.ResponseFilters, lengthFilter)
}
configs = append(configs, config)
}
return configs, nil
}
// pool gzip.Writer according to compress level
// so we can reuse allocations over time
var (
writerPool = map[int]*sync.Pool{}
defaultWriterPoolIndex int
)
func initWriterPool() {
var i int
newWriterPool := func(level int) *sync.Pool {
return &sync.Pool{
New: func() interface{} {
w, _ := gzip.NewWriterLevel(ioutil.Discard, level)
return w
},
}
}
for i = gzip.BestSpeed; i <= gzip.BestCompression; i++ {
writerPool[i] = newWriterPool(i)
}
// add default writer pool
defaultWriterPoolIndex = i
writerPool[defaultWriterPoolIndex] = newWriterPool(gzip.DefaultCompression)
}
func getWriter(level int) *gzip.Writer {
index := defaultWriterPoolIndex
if level >= gzip.BestSpeed && level <= gzip.BestCompression {
index = level
}
w := writerPool[index].Get().(*gzip.Writer)
w.Reset(ioutil.Discard)
return w
}
func putWriter(level int, w *gzip.Writer) {
index := defaultWriterPoolIndex
if level >= gzip.BestSpeed && level <= gzip.BestCompression {
index = level
}
w.Close()
writerPool[index].Put(w)
}