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|
package util
import (
"bytes"
"fmt"
"github.com/valyala/fasthttp"
"sync"
"time"
)
var (
fastClient = &fasthttp.Client{
NoDefaultUserAgentHeader: true, // Don't send: User-Agent: fasthttp
MaxConnsPerHost: 1024,
ReadBufferSize: 4096, // Make sure to set this big enough that your whole request can be read at once.
WriteBufferSize: 64 * 1024, // Same but for your response.
ReadTimeout: time.Second,
WriteTimeout: time.Second,
MaxIdleConnDuration: time.Minute,
DisableHeaderNamesNormalizing: true, // If you set the case on your headers correctly you can enable this.
}
// Put everything in pools to prevent garbage.
bytesPool = sync.Pool{
New: func() interface{} {
b := make([]byte, 0)
return &b
},
}
responsePool = sync.Pool{
New: func() interface{} {
return make(chan *fasthttp.Response)
},
}
)
func FastGet(url string) ([]byte, bool, error) {
req := fasthttp.AcquireRequest()
res := fasthttp.AcquireResponse()
defer fasthttp.ReleaseRequest(req)
defer fasthttp.ReleaseResponse(res)
req.SetRequestURIBytes([]byte(url))
req.Header.Add("Accept-Encoding", "gzip")
err := fastClient.Do(req, res)
if err != nil {
return nil, true, err
}
var data []byte
contentEncoding := res.Header.Peek("Content-Encoding")
if bytes.Compare(contentEncoding, []byte("gzip")) == 0 {
data, err = res.BodyGunzip()
} else {
data = res.Body()
}
out := make([]byte, len(data))
copy(out, data)
if res.StatusCode() >= 400 {
retryable := res.StatusCode() >= 500
return nil, retryable, fmt.Errorf("%s: %s", url, res.StatusCode())
}
if err != nil {
return nil, false, err
}
return out, false, nil
}
func FastReadUrlAsStream(fileUrl string, cipherKey []byte, isContentGzipped bool, isFullChunk bool, offset int64, size int, fn func(data []byte)) (retryable bool, err error) {
if cipherKey != nil {
return readEncryptedUrl(fileUrl, cipherKey, isContentGzipped, isFullChunk, offset, size, fn)
}
req := fasthttp.AcquireRequest()
res := fasthttp.AcquireResponse()
defer fasthttp.ReleaseRequest(req)
defer fasthttp.ReleaseResponse(res)
req.SetRequestURIBytes([]byte(fileUrl))
if isFullChunk {
req.Header.Add("Accept-Encoding", "gzip")
} else {
req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+int64(size)-1))
}
if err = fastClient.Do(req, res); err != nil {
return true, err
}
if res.StatusCode() >= 400 {
retryable = res.StatusCode() >= 500
return retryable, fmt.Errorf("%s: %s", fileUrl, res.StatusCode())
}
contentEncoding := res.Header.Peek("Content-Encoding")
if bytes.Compare(contentEncoding, []byte("gzip")) == 0 {
bodyData, err := res.BodyGunzip()
if err != nil {
return false, err
}
fn(bodyData)
} else {
fn(res.Body())
}
return false, nil
}
|
