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http_reverse_proxy.go
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/
http_reverse_proxy.go
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package reverse_proxy
import (
"net/http"
"net/http/httputil"
"net/url"
"strings"
"github.com/gin-gonic/gin"
balance "github.com/gostarer/balance"
"github.com/gostarer/gateway/middleware"
)
func NewLoadBalanceReverseProxy(c *gin.Context, lb balance.LoadBalance, trans *http.Transport) *httputil.ReverseProxy {
//请求协调者
director := func(req *http.Request) {
nextAddr, err := lb.Get(req.URL.String())
//todo 优化点3
if err != nil || nextAddr == "" {
panic("get next addr fail")
}
target, err := url.Parse(nextAddr)
if err != nil {
panic(err)
}
targetQuery := target.RawQuery
req.URL.Scheme = target.Scheme
req.URL.Host = target.Host
req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
req.Host = target.Host
if targetQuery == "" || req.URL.RawQuery == "" {
req.URL.RawQuery = targetQuery + req.URL.RawQuery
} else {
req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
}
if _, ok := req.Header["User-Agent"]; !ok {
req.Header.Set("User-Agent", "user-agent")
}
}
//更改内容
modifyFunc := func(resp *http.Response) error {
if strings.Contains(resp.Header.Get("Connection"), "Upgrade") {
return nil
}
//todo 优化点2
//var payload []byte
//var readErr error
//
//if strings.Contains(resp.Header.Get("Content-Encoding"), "gzip") {
// gr, err := gzip.NewReader(resp.Body)
// if err != nil {
// return err
// }
// payload, readErr = ioutil.ReadAll(gr)
// resp.Header.Del("Content-Encoding")
//} else {
// payload, readErr = ioutil.ReadAll(resp.Body)
//}
//if readErr != nil {
// return readErr
//}
//
//c.Set("status_code", resp.StatusCode)
//c.Set("payload", payload)
//resp.Body = ioutil.NopCloser(bytes.NewBuffer(payload))
//resp.ContentLength = int64(len(payload))
//resp.Header.Set("Content-Length", strconv.FormatInt(int64(len(payload)), 10))
return nil
}
//错误回调 :关闭real_server时测试,错误回调
//范围:transport.RoundTrip发生的错误、以及ModifyResponse发生的错误
errFunc := func(w http.ResponseWriter, r *http.Request, err error) {
middleware.ResponseError(c, 999, err)
}
return &httputil.ReverseProxy{Director: director, ModifyResponse: modifyFunc, ErrorHandler: errFunc}
}
func singleJoiningSlash(a, b string) string {
aslash := strings.HasSuffix(a, "/")
bslash := strings.HasPrefix(b, "/")
switch {
case aslash && bslash:
return a + b[1:]
case !aslash && !bslash:
return a + "/" + b
}
return a + b
}