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Implement multiple public IP resolvers
The gateway nodes now can be labeled as: gateway.submariner.io/public-ip=<resolver>[,resolver..] where resolvers take the form of <method>:<parameter> the implemented methods are: - api - lb - ipv4 - dns Signed-off-by: Miguel Angel Ajo <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| package endpoint | ||
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| import ( | ||
| "context" | ||
| "io/ioutil" | ||
| "net" | ||
| "net/http" | ||
| "regexp" | ||
| "strings" | ||
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| "github.com/pkg/errors" | ||
| v1 "github.com/submariner-io/submariner/pkg/apis/submariner.io/v1" | ||
| "github.com/submariner-io/submariner/pkg/types" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/klog" | ||
| ) | ||
|
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| type publicIPResolverFunction func(clientset kubernetes.Interface, namespace, value string) (string, error) | ||
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| var publicIPMethods = map[string]publicIPResolverFunction{ | ||
| v1.API: publicAPI, | ||
| v1.IPv4: publicIP, | ||
| v1.LoadBalancer: publicLoadBalancerIP, | ||
| v1.DNS: publicDNSIP, | ||
| } | ||
|
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| var IPv4RE = regexp.MustCompile(`(?:\d{1,3}\.){3}\d{1,3}`) | ||
|
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| func getPublicIP(submSpec types.SubmarinerSpecification, k8sClient kubernetes.Interface, backendConfig map[string]string) (string, error) { | ||
| config, ok := backendConfig[v1.PublicIP] | ||
| if !ok { | ||
| config = "api:api.ipify.org" | ||
| } | ||
|
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| resolvers := strings.Split(config, ",") | ||
| for _, resolver := range resolvers { | ||
| resolver = strings.Trim(resolver, " ") | ||
| parts := strings.Split(resolver, ":") | ||
| if len(parts) != 2 { | ||
| return "", errors.Errorf("invalid format for %q label: %q", v1.GatewayConfigLabelPrefix+v1.PublicIP, config) | ||
| } | ||
|
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| method, ok := publicIPMethods[parts[0]] | ||
| if !ok { | ||
| return "", errors.Errorf("unknown resolver %q in %q label: %q", parts[0], v1.GatewayConfigLabelPrefix+v1.PublicIP, config) | ||
| } | ||
|
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| ip, err := method(k8sClient, submSpec.Namespace, parts[1]) | ||
| if err == nil { | ||
| return ip, nil | ||
| } | ||
|
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| // If this resolved failed we log it, but we fall back to the next one | ||
| klog.Errorf("Error resolving public IP with resolver %s : %s", resolver, err.Error()) | ||
| } | ||
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| if len(resolvers) > 0 { | ||
| return "", errors.Errorf("Unable to resolve public IP by any of the resolver methods: %s", resolvers) | ||
| } | ||
|
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| return "", nil | ||
| } | ||
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| func publicAPI(clientset kubernetes.Interface, namespace, value string) (string, error) { | ||
| url := "https://" + value | ||
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| //nolint:gosec // we really need to get from a non-predefined const URL | ||
| response, err := http.Get(url) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "retrieving public IP from %s", url) | ||
| } | ||
|
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| defer response.Body.Close() | ||
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| body, err := ioutil.ReadAll(response.Body) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "reading API response from %s", url) | ||
| } | ||
|
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| return firstIPv4InString(string(body)) | ||
| } | ||
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| func publicIP(clientset kubernetes.Interface, namespace, value string) (string, error) { | ||
| return firstIPv4InString(value) | ||
| } | ||
|
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| func publicLoadBalancerIP(clientset kubernetes.Interface, namespace, loadBalancerName string) (string, error) { | ||
| service, err := clientset.CoreV1().Services(namespace).Get(context.TODO(), loadBalancerName, metav1.GetOptions{}) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "error getting service %q for the public IP address", loadBalancerName) | ||
| } | ||
|
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| if len(service.Status.LoadBalancer.Ingress) < 1 { | ||
| return "", errors.Errorf("service %q doesn't contain any LoadBalancer ingress", loadBalancerName) | ||
| } | ||
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| ingress := service.Status.LoadBalancer.Ingress[0] | ||
| if ingress.IP != "" { | ||
| return ingress.IP, nil | ||
| } | ||
|
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| if ingress.Hostname != "" { | ||
| ip, err := publicDNSIP(clientset, namespace, ingress.Hostname) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "error resolving LoadBalancer ingress HostName %q", ingress.Hostname) | ||
| } | ||
|
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| return ip, nil | ||
| } | ||
|
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| return "", errors.Errorf("no IP or Hostname for service LoadBalancer %q Ingress", loadBalancerName) | ||
| } | ||
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| func publicDNSIP(clientset kubernetes.Interface, namespace, fqdn string) (string, error) { | ||
| ips, err := net.LookupIP(fqdn) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "error resolving DNS hostname %q for public IP", fqdn) | ||
| } | ||
|
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| return ips[0].String(), nil | ||
| } | ||
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| func firstIPv4InString(body string) (string, error) { | ||
| matches := IPv4RE.FindAllString(body, -1) | ||
| if len(matches) == 0 { | ||
| return "", errors.Errorf("No IPv4 found in: %q", body) | ||
| } | ||
|
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| return matches[0], nil | ||
| } |
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