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