Adding OWNERS file for vSphere cloud-provider package

also updating license file for Govmomi library

vendor/github.com/vmware/govmomi/vim25/retry.go

@@ -0,0 +1,105 @@
+/*
+Copyright (c) 2015 VMware, Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package vim25
+
+import (
+	"net"
+	"net/url"
+	"time"
+
+	"github.com/vmware/govmomi/vim25/soap"
+	"golang.org/x/net/context"
+)
+
+type RetryFunc func(err error) (retry bool, delay time.Duration)
+
+// TemporaryNetworkError returns a RetryFunc that retries up to a maximum of n
+// times, only if the error returned by the RoundTrip function is a temporary
+// network error (for example: a connect timeout).
+func TemporaryNetworkError(n int) RetryFunc {
+	return func(err error) (retry bool, delay time.Duration) {
+		var nerr net.Error
+		var ok bool
+
+		// Never retry if this is not a network error.
+		switch rerr := err.(type) {
+		case *url.Error:
+			if nerr, ok = rerr.Err.(net.Error); !ok {
+				return false, 0
+			}
+		case net.Error:
+			nerr = rerr
+		default:
+			return false, 0
+		}
+
+		if !nerr.Temporary() {
+			return false, 0
+		}
+
+		// Don't retry if we're out of tries.
+		if n--; n <= 0 {
+			return false, 0
+		}
+
+		return true, 0
+	}
+}
+
+type retry struct {
+	roundTripper soap.RoundTripper
+
+	// fn is a custom function that is called when an error occurs.
+	// It returns whether or not to retry, and if so, how long to
+	// delay before retrying.
+	fn RetryFunc
+}
+
+// Retry wraps the specified soap.RoundTripper and invokes the
+// specified RetryFunc. The RetryFunc returns whether or not to
+// retry the call, and if so, how long to wait before retrying. If
+// the result of this function is to not retry, the original error
+// is returned from the RoundTrip function.
+func Retry(roundTripper soap.RoundTripper, fn RetryFunc) soap.RoundTripper {
+	r := &retry{
+		roundTripper: roundTripper,
+		fn:           fn,
+	}
+
+	return r
+}
+
+func (r *retry) RoundTrip(ctx context.Context, req, res soap.HasFault) error {
+	var err error
+
+	for {
+		err = r.roundTripper.RoundTrip(ctx, req, res)
+		if err == nil {
+			break
+		}
+
+		// Invoke retry function to see if another attempt should be made.
+		if retry, delay := r.fn(err); retry {
+			time.Sleep(delay)
+			continue
+		}
+
+		break
+	}
+
+	return err
+}