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Adds Validate() function which checks Endpoint IPs and Node Addresses for dispatcher set membership authorization.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| // Package endpoints provides kubernetes Endpoint IP retrieval | ||
| package endpoints | ||
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| import ( | ||
| "context" | ||
| "log" | ||
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| "github.com/ericchiang/k8s" | ||
| corev1 "github.com/ericchiang/k8s/apis/core/v1" | ||
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| "github.com/pkg/errors" | ||
| ) | ||
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| // Endpoints describes the set of Endpoints for a Service as well as the addresses of the Nodes on which those Endpoints run | ||
| type Endpoints struct { | ||
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| // Addresses is the list of IP addresses for the Endpoints | ||
| Addresses []string | ||
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| // NodeAddresses is the list of Node addresses on which the Endpoints run | ||
| NodeAddresses []string | ||
| } | ||
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| // Get retrieves the IP addresses for a named endpoint in a given | ||
| // namespace. If the namespace is empty, the `default` namespace | ||
| // will be used. | ||
| func Get(ctx context.Context, c *k8s.Client, epNamespace, epName string) (ret Endpoints, err error) { | ||
| nodes := make(map[string]*corev1.Node) | ||
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| ep := new(corev1.Endpoints) | ||
| if err := c.Get(ctx, epNamespace, epName, ep); err != nil { | ||
| return ret, errors.Wrap(err, "failed to list endpoints") | ||
| } | ||
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| for _, s := range ep.GetSubsets() { | ||
| for _, a := range s.GetAddresses() { | ||
| ret.Addresses = append(ret.Addresses, a.GetIp()) | ||
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| epNode := new(corev1.Node) | ||
| if err = c.Get(ctx, epNamespace, a.GetNodeName(), epNode); err != nil { | ||
| log.Printf("WARNING: failed to get node %s for endpoint %s: %v", a.GetNodeName(), ep.String(), err) | ||
| } | ||
| } | ||
| } | ||
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| for _, n := range nodes { | ||
| for _, a := range n.GetStatus().GetAddresses() { | ||
| ret.NodeAddresses = append(ret.NodeAddresses, a.GetAddress()) | ||
| } | ||
| } | ||
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| return | ||
| } | ||
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| // Watch watches a namespace and returns a nil error on the provided channel | ||
| // when a change occurs. If an error occurs, the error will be sent down the | ||
| // channel and the watch will terminate. | ||
| func Watch(ctx context.Context, c *k8s.Client, changes chan error, namespace string) error { | ||
| epList := new(corev1.Endpoints) | ||
| w, err := c.Watch(ctx, namespace, epList) | ||
| if err != nil { | ||
| changes <- errors.Wrap(err, "failed to watch namespace") | ||
| return errors.Wrap(err, "failed to watch namespace") | ||
| } | ||
| defer w.Close() // nolint: errcheck | ||
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| for ctx.Err() == nil { | ||
| ep := new(corev1.Endpoints) | ||
| _, err := w.Next(ep) | ||
| if err != nil { | ||
| changes <- errors.Wrap(err, "failure during watch") | ||
| return errors.Wrap(err, "failure during watch") | ||
| } | ||
| changes <- nil | ||
| } | ||
|
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| return ctx.Err() | ||
| } |
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