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curl.go
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curl.go
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package main
import (
"context"
"io"
"net"
"net/http"
"time"
"github.com/AdguardTeam/dnsproxy/upstream"
)
var tcpTimeout = 30 * time.Second
func curl(url string, resolvers []string, retry int) (data []byte, err error) {
client := &http.Client{
Transport: &http.Transport{
ResponseHeaderTimeout: tcpTimeout,
IdleConnTimeout: tcpTimeout,
DisableKeepAlives: true,
},
Timeout: tcpTimeout,
}
dialer := &net.Dialer{
Timeout: tcpTimeout,
DualStack: true,
}
bootNSs := []upstream.Resolver{}
for _, it := range resolvers {
if b, err := upstream.AddressToUpstream(it, &upstream.Options{Timeout: tcpTimeout}); err == nil {
if r, err := upstream.NewUpstreamResolver(b.Address(), &upstream.Options{Timeout: tcpTimeout}); err == nil {
bootNSs = append(bootNSs, r)
}
}
}
if len(bootNSs) > 0 {
client.Transport.(*http.Transport).DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
host, port, _ := net.SplitHostPort(addr)
if addrs, err := upstream.LookupParallel(ctx, bootNSs, host); err == nil {
for _, v := range addrs {
if v.IsValid() {
addr = net.JoinHostPort(v.String(), port)
break
}
}
} else {
return nil, err
}
return dialer.DialContext(ctx, network, addr)
}
}
request, _ := http.NewRequest("GET", url, nil)
if resp, dErr := client.Do(request); err != nil {
if retry <= 0 {
return nil, dErr
} else {
return curl(url, resolvers, retry-1)
}
} else {
data, err = io.ReadAll(resp.Body)
resp.Body.Close()
}
return
}