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rollback_generator.go
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rollback_generator.go
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package rollback
import (
"fmt"
"k8s.io/kubernetes/pkg/api/legacyscheme"
appsapi "github.com/openshift/origin/pkg/apps/apis/apps"
)
// RollbackGenerator generates a new deployment config by merging a pair of deployment
// configs in a configurable way.
type RollbackGenerator interface {
// GenerateRollback creates a new deployment config by merging to onto from
// based on the options provided by spec. The latestVersion of the result is
// unconditionally incremented, as rollback candidates should be possible
// to be deployed manually regardless of other system behavior such as
// triggering.
//
// Any image change triggers on the new config are disabled to prevent
// triggered deployments from immediately replacing the rollback.
GenerateRollback(from, to *appsapi.DeploymentConfig, spec *appsapi.DeploymentConfigRollbackSpec) (*appsapi.DeploymentConfig, error)
}
// NewRollbackGenerator returns a new rollback generator.
func NewRollbackGenerator() RollbackGenerator {
return &rollbackGenerator{}
}
type rollbackGenerator struct{}
func (g *rollbackGenerator) GenerateRollback(from, to *appsapi.DeploymentConfig, spec *appsapi.DeploymentConfigRollbackSpec) (*appsapi.DeploymentConfig, error) {
rollback := &appsapi.DeploymentConfig{}
if err := legacyscheme.Scheme.Convert(&from, &rollback, nil); err != nil {
return nil, fmt.Errorf("couldn't clone 'from' DeploymentConfig: %v", err)
}
// construct the candidate deploymentConfig based on the rollback spec
if spec.IncludeTemplate {
if err := legacyscheme.Scheme.Convert(&to.Spec.Template, &rollback.Spec.Template, nil); err != nil {
return nil, fmt.Errorf("couldn't copy template to rollback:: %v", err)
}
}
if spec.IncludeReplicationMeta {
rollback.Spec.Replicas = to.Spec.Replicas
rollback.Spec.Selector = map[string]string{}
for k, v := range to.Spec.Selector {
rollback.Spec.Selector[k] = v
}
}
if spec.IncludeTriggers {
if err := legacyscheme.Scheme.Convert(&to.Spec.Triggers, &rollback.Spec.Triggers, nil); err != nil {
return nil, fmt.Errorf("couldn't copy triggers to rollback:: %v", err)
}
}
if spec.IncludeStrategy {
if err := legacyscheme.Scheme.Convert(&to.Spec.Strategy, &rollback.Spec.Strategy, nil); err != nil {
return nil, fmt.Errorf("couldn't copy strategy to rollback:: %v", err)
}
}
// Disable any image change triggers.
for _, trigger := range rollback.Spec.Triggers {
if trigger.Type == appsapi.DeploymentTriggerOnImageChange {
trigger.ImageChangeParams.Automatic = false
}
}
// TODO: add a new cause?
// TODO: Instantiate instead of incrementing latestVersion
rollback.Status.LatestVersion++
return rollback, nil
}