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resolver.go
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resolver.go
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// Copyright 2022 The searKing Author. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
import (
"net/http"
"net/url"
"github.com/searKing/golang/go/net/resolver"
url_ "github.com/searKing/golang/go/net/url"
)
// RequestWithTarget reset Host in url.Url by resolver.Target
// reset Host in req if replaceHostInRequest is true
func RequestWithTarget(req *http.Request, target string, replaceHostInRequest bool) error {
if target == "" {
return nil
}
u2, err := url_.ResolveWithTarget(req.Context(), req.URL, target)
if err != nil {
return err
}
host := req.URL.Host
req.URL = u2
if replaceHostInRequest {
req.Host = u2.Host
} else {
req.Host = host
}
return nil
}
// ProxyFuncWithTargetOrDefault builds a proxy function from the given string, which should
// represent a target that can be used as a proxy. It performs basic
// sanitization of the Target and returns any error encountered.
func ProxyFuncWithTargetOrDefault(target string, def func(req *http.Request) (*url.URL, error)) func(req *http.Request) (*url.URL, error) {
if target == "" {
return def
}
return func(req *http.Request) (*url.URL, error) {
reqURL := req.URL
if target == "" {
return nil, nil
}
address, err := resolver.ResolveOneAddr(req.Context(), target)
if err != nil {
return nil, err
}
tgt := resolver.ParseTarget(target, false)
var proxy url.URL
if tgt.Scheme == "http" || tgt.Scheme == "https" {
proxy.Scheme = tgt.Scheme
} else {
proxy.Scheme = reqURL.Scheme
}
proxy.Host = address.Addr
return &proxy, nil
}
}
// RoundTripperWithTarget wraps http.RoundTripper with request url replaced by target resolved by resolver.
// target is as like gRPC Naming for service discovery.
func RoundTripperWithTarget(rt http.RoundTripper, target string, replaceHostInRequest bool) http.RoundTripper {
if target == "" {
return rt
}
return RoundTripFunc(func(req *http.Request) (resp *http.Response, err error) {
err = RequestWithTarget(req, target, replaceHostInRequest)
if err != nil {
return nil, err
}
return rt.RoundTrip(req)
})
}
// TransportWithProxyTarget wraps http.RoundTripper with request url replaced by target resolved by resolver.
// target is as like gRPC Naming for service discovery.
func TransportWithProxyTarget(t *http.Transport, target string) *http.Transport {
t.Proxy = ProxyFuncWithTargetOrDefault(target, t.Proxy)
return t
}