mirror of
https://github.com/rclone/rclone.git
synced 2024-12-13 02:33:58 +01:00
49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
// Copyright (C) 2020 Storj Labs, Inc.
|
|
// See LICENSE for copying information.
|
|
|
|
package rpc
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
)
|
|
|
|
// LookupNodeAddress resolves a storage node address to the first IP address resolved.
|
|
// If an IP address is accidentally provided it is returned back. This function
|
|
// is used to resolve storage node IP addresses so that uplinks can use
|
|
// IP addresses directly without resolving many hosts.
|
|
func LookupNodeAddress(ctx context.Context, nodeAddress string) string {
|
|
host, port, err := net.SplitHostPort(nodeAddress)
|
|
if err != nil {
|
|
// If there was an error parsing out the port we just use a plain host.
|
|
host = nodeAddress
|
|
port = ""
|
|
}
|
|
|
|
// We check if the address is an IP address to decide if we need to resolve it or not.
|
|
ip := net.ParseIP(host)
|
|
// nodeAddress is already an IP, so we can use that.
|
|
if ip != nil {
|
|
return nodeAddress
|
|
}
|
|
|
|
// We have a hostname not an IP address so we should resolve the IP address
|
|
// to give back to the uplink client.
|
|
addresses, err := net.DefaultResolver.LookupHost(ctx, host)
|
|
if err != nil || len(addresses) == 0 {
|
|
// We ignore the error because if this fails for some reason we can just
|
|
// re-use the hostname, it just won't be as fast for the uplink to dial.
|
|
return nodeAddress
|
|
}
|
|
|
|
// We return the first address found because some DNS servers already do
|
|
// round robin load balancing and we would be messing with their behaviour
|
|
// if we tried to get smart here.
|
|
first := addresses[0]
|
|
|
|
if port == "" {
|
|
return first
|
|
}
|
|
return net.JoinHostPort(first, port)
|
|
}
|