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utils.go
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utils.go
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package discov
import (
"context"
"errors"
"go.etcd.io/etcd/clientv3"
"google.golang.org/grpc/resolver"
"net"
"strconv"
"strings"
"time"
)
const (
authorityEtcd = "etcd"
authorityDNS = "dns"
)
var (
supportedAuthorities = []string{
authorityEtcd,
authorityDNS,
// ...
}
errUnsupportedAuthorityInTarget = errors.New("unsupported authority in target")
errEmptyAuthorityInTarget = errors.New("empty authority in target")
errInvalidEndpointInDNSTarget = errors.New("invalid endpoint, must be in form of `DNSName:port`")
)
func isSupportedAuthority(a string) bool {
for i := range supportedAuthorities {
if a == supportedAuthorities[i] {
return true
}
}
return false
}
func parseTarget(t resolver.Target) (scheme, authority, endpoint string, err error) {
scheme, authority, endpoint = t.Scheme, t.Authority, t.Endpoint
if !isSupportedAuthority(authority) {
err = errUnsupportedAuthorityInTarget
return
}
if endpoint == "" {
err = errEmptyAuthorityInTarget
return
}
return
}
func parseEndpointInDNSTarget(endpoint string) (DNSName string, port int, err error) {
s := strings.Split(endpoint, ":")
// no port specified, default 80
if len(s) == 1 {
DNSName, port = s[0], 80
return
}
if len(s) != 2 {
err = errInvalidEndpointInDNSTarget
return
}
port, err = strconv.Atoi(s[1])
if err != nil {
err = errInvalidEndpointInDNSTarget
return
}
DNSName = s[0]
return
}
func formatIP(addr string) (addrIP string, ok bool) {
ip := net.ParseIP(addr)
if ip == nil {
return "", false
}
if ip.To4() != nil {
return addr, true
}
return "[" + addr + "]", true
}
func isEtcdClientAvailable(cli *clientv3.Client) bool {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
defer cancel()
if _, err := cli.Get(ctx, "ping"); err != nil {
return false
}
return true
}
func makeErrorChannel() chan error {
return make(chan error, 1<<6)
}