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rollout_strategy.go
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rollout_strategy.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package create
import "fmt"
// RolloutStrategy is the mechanism to describe how to approach managing
// existing instances part of an existing service group during deployment.
type RolloutStrategy string
const (
// The 'exit' strategy is used to error-out and indicate that no strategy was
// provided and that further operations cannot be completed.
RolloutStrategyExit = RolloutStrategy("exit")
// The 'stop' strategy stops the qualified existing instance(s) within the
// same service group and starts the new instance(s).
RolloutStrategyStop = RolloutStrategy("stop")
// The 'stop' strategy stops the qualified existing instance(s) within the
// same service group and starts the new instance(s).
RolloutStrategyRemove = RolloutStrategy("remove")
// The 'keep' strategy keeps the existing qualified instance(s) within the
// same service group and starts the new instance(s).
RolloutStrategyKeep = RolloutStrategy("keep")
// The 'prompt' strategy is an "unlisted" strategy that's used in TTY contexts
// where the user is given the opportunity to decide the rollout strategy
// before the rollout operation is performed. The result of this decision
// should yield one of the above rollout strategies.
StrategyPrompt = RolloutStrategy("prompt")
)
var _ fmt.Stringer = (*RolloutStrategy)(nil)
// String implements fmt.Stringer
func (strategy RolloutStrategy) String() string {
return string(strategy)
}
// RolloutStrategies returns the list of possible rollout strategies.
func RolloutStrategies() []RolloutStrategy {
return []RolloutStrategy{
RolloutStrategyExit,
RolloutStrategyStop,
RolloutStrategyRemove,
RolloutStrategyKeep,
}
}
// RolloutStrategyNames returns the string representation of all possible
// rollout strategies.
func RolloutStrategyNames() []string {
strategies := []string{}
for _, strategy := range RolloutStrategies() {
strategies = append(strategies, strategy.String())
}
return strategies
}