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// Copyright 2013 Canonical Ltd.
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// Licensed under the AGPLv3, see LICENCE file for details.
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"launchpad.net/juju-core/instance"
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"launchpad.net/juju-core/utils"
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// Use ShortAttempt to poll for short-term events.
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// TODO: This may need tuning for different providers (or even environments).
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var ShortAttempt = utils.AttemptStrategy{
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Total: 5 * time.Second,
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Delay: 200 * time.Millisecond,
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// A request may fail to due "eventual consistency" semantics, which
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// should resolve fairly quickly. These delays are specific to the provider
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// and best tuned there.
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// Other requests fail due to a slow state transition (e.g. an instance taking
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// a while to release a security group after termination). If you need to
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// poll for the latter kind, use LongAttempt.
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var LongAttempt = utils.AttemptStrategy{
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Total: 3 * time.Minute,
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Delay: 1 * time.Second,
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// WaitDNSName is an implementation that the providers can use. It builds on
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// the provider's implementation of Instance.DNSName.
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func WaitDNSName(inst instance.Instance) (string, error) {
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for a := LongAttempt.Start(); a.Next(); {
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name, err := inst.DNSName()
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if err == nil || err != instance.ErrNoDNSName {
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return "", fmt.Errorf("timed out trying to get DNS address for %v", inst.Id())
added
removed
src/launchpad.net/juju-core/environs/polling.go
