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connection_uri.go
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/
connection_uri.go
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// Deals with https://libvirt.org/uri.html
// go-libvirt needs a working transport to talk rpc to libvirt.
// This module deals with setting up those transports
package uri
import (
"fmt"
"net"
"net/url"
"strings"
"time"
)
const (
dialTimeout = 2 * time.Second
)
type ConnectionURI struct {
*url.URL
}
func Parse(uriStr string) (*ConnectionURI, error) {
url, err := url.Parse(uriStr)
if err != nil {
return nil, err
}
return &ConnectionURI{URL: url}, nil
}
// According to https://libvirt.org/uri.html
// The name passed to the remote virConnectOpen function is formed by removing
// transport, hostname, port number, username and extra parameters from the remote URI
// unless the name option is specified.
func (u ConnectionURI) RemoteName() string {
q := u.Query()
if name := q.Get("name"); name != "" {
return name
}
newURI := *u.URL
newURI.Scheme = u.driver()
newURI.User = nil
newURI.Host = ""
newURI.RawQuery = ""
return newURI.String()
}
func (u *ConnectionURI) transport() string {
parts := strings.Split(u.Scheme, "+")
if len(parts) > 1 {
return parts[1]
}
if u.Host != "" {
return "tls"
}
return "unix"
}
func (u *ConnectionURI) driver() string {
return strings.Split(u.Scheme, "+")[0]
}
// Dial implements go-libvirt Dialer interface, which is used
// to retrieve connections to talk via RPC to libvirtd.
//
// For example, a qemu+ssh:/// uri would return a SSH connection
// to localhost, and a new URI to qemu+unix:///system
// dials the transport for this connection URI.
func (u *ConnectionURI) Dial() (net.Conn, error) {
t := u.transport()
switch t {
case "tcp":
return u.dialTCP()
case "tls":
return u.dialTLS()
case "unix":
return u.dialUNIX()
case "ssh":
return u.dialSSH()
}
return nil, fmt.Errorf("transport '%s' not implemented", t)
}