forked from openshift/origin
/
controller.go
180 lines (157 loc) · 8.19 KB
/
controller.go
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package deploymentconfig
import (
"fmt"
"sort"
"strconv"
"github.com/golang/glog"
kapi "github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client/record"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
deployapi "github.com/openshift/origin/pkg/deploy/api"
deployutil "github.com/openshift/origin/pkg/deploy/util"
)
// DeploymentConfigController is responsible for creating a new deployment when:
//
// 1. The config version is > 0 and,
// 2. No existing deployment for that version exists.
//
// The responsibility of constructing a new deployment resource from a config
// is delegated. See util.MakeDeployment for more details. The new deployment
// will have DesiredReplicasAnnotation set to the desired replica count for
// the new deployment based on the replica count of the previous/active
// deployment.
//
// Use the DeploymentConfigControllerFactory to create this controller.
type DeploymentConfigController struct {
// deploymentClient provides access to deployments.
deploymentClient deploymentClient
// makeDeployment knows how to make a deployment from a config.
makeDeployment func(*deployapi.DeploymentConfig) (*kapi.ReplicationController, error)
recorder record.EventRecorder
}
// fatalError is an error which can't be retried.
type fatalError string
// transientError is an error which should always be retried (indefinitely).
type transientError string
func (e fatalError) Error() string {
return fmt.Sprintf("fatal error handling DeploymentConfig: %s", string(e))
}
func (e transientError) Error() string {
return "transient error handling DeploymentConfig: " + string(e)
}
// Handle processes config and creates a new deployment if necessary.
func (c *DeploymentConfigController) Handle(config *deployapi.DeploymentConfig) error {
// Only deploy when the version has advanced past 0.
if config.LatestVersion == 0 {
glog.V(5).Infof("Waiting for first version of %s", deployutil.LabelForDeploymentConfig(config))
return nil
}
// Check if any existing inflight deployments (any non-terminal state).
existingDeployments, err := c.deploymentClient.listDeploymentsForConfig(config.Namespace, config.Name)
if err != nil {
return fmt.Errorf("couldn't list Deployments for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err)
}
var inflightDeployment *kapi.ReplicationController
latestDeploymentExists := false
for _, deployment := range existingDeployments.Items {
// check if this is the latest deployment
// we'll return after we've dealt with the multiple-active-deployments case
if deployutil.DeploymentVersionFor(&deployment) == config.LatestVersion {
latestDeploymentExists = true
}
deploymentStatus := deployutil.DeploymentStatusFor(&deployment)
switch deploymentStatus {
case deployapi.DeploymentStatusFailed,
deployapi.DeploymentStatusComplete:
// Previous deployment in terminal state - can ignore
// Ignoring specific deployment states so that any newly introduced
// deployment state will not be ignored
default:
if inflightDeployment == nil {
inflightDeployment = &deployment
continue
}
var deploymentForCancellation *kapi.ReplicationController
if deployutil.DeploymentVersionFor(inflightDeployment) < deployutil.DeploymentVersionFor(&deployment) {
deploymentForCancellation, inflightDeployment = inflightDeployment, &deployment
} else {
deploymentForCancellation = &deployment
}
deploymentForCancellation.Annotations[deployapi.DeploymentCancelledAnnotation] = deployapi.DeploymentCancelledAnnotationValue
deploymentForCancellation.Annotations[deployapi.DeploymentStatusReasonAnnotation] = deployapi.DeploymentCancelledNewerDeploymentExists
if _, err := c.deploymentClient.updateDeployment(deploymentForCancellation.Namespace, deploymentForCancellation); err != nil {
util.HandleError(fmt.Errorf("couldn't cancel Deployment %s: %v", deployutil.LabelForDeployment(deploymentForCancellation), err))
}
glog.V(4).Infof("Cancelled Deployment %s for DeploymentConfig %s", deployutil.LabelForDeployment(deploymentForCancellation), deployutil.LabelForDeploymentConfig(config))
}
}
// if the latest deployment exists then nothing else needs to be done
if latestDeploymentExists {
return nil
}
// check to see if there are inflight deployments
if inflightDeployment != nil {
// raise a transientError so that the deployment config can be re-queued
glog.V(4).Infof("Found previous inflight Deployment for %s - will requeue", deployutil.LabelForDeploymentConfig(config))
return transientError(fmt.Sprintf("found previous inflight Deployment for %s - requeuing", deployutil.LabelForDeploymentConfig(config)))
}
// Try and build a deployment for the config.
deployment, err := c.makeDeployment(config)
if err != nil {
return fatalError(fmt.Sprintf("couldn't make Deployment from (potentially invalid) DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err))
}
// Compute the desired replicas for the deployment. Use the last completed
// deployment's current replica count, or the config template if there is no
// prior completed deployment available.
desiredReplicas := config.Template.ControllerTemplate.Replicas
if len(existingDeployments.Items) > 0 {
sort.Sort(deployutil.DeploymentsByLatestVersionDesc(existingDeployments.Items))
for _, existing := range existingDeployments.Items {
if deployutil.DeploymentStatusFor(&existing) == deployapi.DeploymentStatusComplete {
desiredReplicas = existing.Spec.Replicas
glog.V(4).Infof("Desired replicas for %s set to %d based on prior completed deployment %s", deployutil.LabelForDeploymentConfig(config), desiredReplicas, existing.Name)
break
}
}
}
deployment.Annotations[deployapi.DesiredReplicasAnnotation] = strconv.Itoa(desiredReplicas)
// Create the deployment.
if _, err := c.deploymentClient.createDeployment(config.Namespace, deployment); err == nil {
glog.V(4).Infof("Created Deployment for DeploymentConfig %s", deployutil.LabelForDeploymentConfig(config))
return nil
} else {
// If the deployment was already created, just move on. The cache could be stale, or another
// process could have already handled this update.
if errors.IsAlreadyExists(err) {
glog.V(4).Infof("Deployment already exists for DeploymentConfig %s", deployutil.LabelForDeploymentConfig(config))
return nil
}
// log an event if the deployment could not be created that the user can discover
c.recorder.Eventf(config, "failedCreate", "Error creating: %v", err)
return fmt.Errorf("couldn't create Deployment for DeploymentConfig %s: %v", deployutil.LabelForDeploymentConfig(config), err)
}
}
// deploymentClient abstracts access to deployments.
type deploymentClient interface {
createDeployment(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error)
// listDeploymentsForConfig should return deployments associated with the
// provided config.
listDeploymentsForConfig(namespace, configName string) (*kapi.ReplicationControllerList, error)
updateDeployment(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error)
}
// deploymentClientImpl is a pluggable deploymentClient.
type deploymentClientImpl struct {
createDeploymentFunc func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error)
listDeploymentsForConfigFunc func(namespace, configName string) (*kapi.ReplicationControllerList, error)
updateDeploymentFunc func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error)
}
func (i *deploymentClientImpl) createDeployment(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
return i.createDeploymentFunc(namespace, deployment)
}
func (i *deploymentClientImpl) listDeploymentsForConfig(namespace, configName string) (*kapi.ReplicationControllerList, error) {
return i.listDeploymentsForConfigFunc(namespace, configName)
}
func (i *deploymentClientImpl) updateDeployment(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
return i.updateDeploymentFunc(namespace, deployment)
}