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rollback.go
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rollback.go
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// Copyright 2021 The PipeCD Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ecs
import (
"context"
"errors"
"github.com/aws/aws-sdk-go-v2/service/ecs/types"
"github.com/pipe-cd/pipecd/pkg/app/piped/executor"
"github.com/pipe-cd/pipecd/pkg/app/piped/platformprovider"
provider "github.com/pipe-cd/pipecd/pkg/app/piped/platformprovider/ecs"
"github.com/pipe-cd/pipecd/pkg/config"
"github.com/pipe-cd/pipecd/pkg/model"
)
type rollbackExecutor struct {
executor.Input
}
func (e *rollbackExecutor) Execute(sig executor.StopSignal) model.StageStatus {
var (
ctx = sig.Context()
originalStatus = e.Stage.Status
status model.StageStatus
)
switch model.Stage(e.Stage.Name) {
case model.StageRollback:
status = e.ensureRollback(ctx)
default:
e.LogPersister.Errorf("Unsupported stage %s for ECS application", e.Stage.Name)
return model.StageStatus_STAGE_FAILURE
}
return executor.DetermineStageStatus(sig.Signal(), originalStatus, status)
}
func (e *rollbackExecutor) ensureRollback(ctx context.Context) model.StageStatus {
// Not rollback in case this is the first deployment.
if e.Deployment.RunningCommitHash == "" {
e.LogPersister.Errorf("Unable to determine the last deployed commit to rollback. It seems this is the first deployment.")
return model.StageStatus_STAGE_FAILURE
}
runningDS, err := e.RunningDSP.GetReadOnly(ctx, e.LogPersister)
if err != nil {
e.LogPersister.Errorf("Failed to prepare running deploy source data (%v)", err)
return model.StageStatus_STAGE_FAILURE
}
appCfg := runningDS.ApplicationConfig.ECSApplicationSpec
if appCfg == nil {
e.LogPersister.Errorf("Malformed application configuration: missing ECSApplicationSpec")
return model.StageStatus_STAGE_FAILURE
}
cloudProviderName, cloudProviderCfg, found := findPlatformProvider(&e.Input)
if !found {
return model.StageStatus_STAGE_FAILURE
}
taskDefinition, ok := loadTaskDefinition(&e.Input, appCfg.Input.TaskDefinitionFile, runningDS)
if !ok {
return model.StageStatus_STAGE_FAILURE
}
serviceDefinition, ok := loadServiceDefinition(&e.Input, appCfg.Input.ServiceDefinitionFile, runningDS)
if !ok {
return model.StageStatus_STAGE_FAILURE
}
primary, _, ok := loadTargetGroups(&e.Input, appCfg, runningDS)
if !ok {
return model.StageStatus_STAGE_FAILURE
}
if !rollback(ctx, &e.Input, cloudProviderName, cloudProviderCfg, taskDefinition, serviceDefinition, primary) {
return model.StageStatus_STAGE_FAILURE
}
return model.StageStatus_STAGE_SUCCESS
}
func rollback(ctx context.Context, in *executor.Input, cloudProviderName string, cloudProviderCfg *config.PlatformProviderECSConfig, taskDefinition types.TaskDefinition, serviceDefinition types.Service, targetGroup *types.LoadBalancer) bool {
in.LogPersister.Infof("Start rollback the ECS service and task family: %s and %s to original stage", *serviceDefinition.ServiceName, *taskDefinition.Family)
client, err := provider.DefaultRegistry().Client(cloudProviderName, cloudProviderCfg, in.Logger)
if err != nil {
in.LogPersister.Errorf("Unable to create ECS client for the provider %s: %v", cloudProviderName, err)
return false
}
// Re-register TaskDef to get TaskDefArn.
// Consider using DescribeServices and get services[0].taskSets[0].taskDefinition (taskDefinition of PRIMARY taskSet)
// then store it in metadata store and use for rollback instead.
td, err := client.RegisterTaskDefinition(ctx, taskDefinition)
if err != nil {
in.LogPersister.Errorf("Failed to register new revision of ECS task definition %s: %v", *taskDefinition.Family, err)
return false
}
// Rollback ECS service configuration to previous state.
service, err := client.UpdateService(ctx, serviceDefinition)
if err != nil {
in.LogPersister.Errorf("Unable to rollback ECS service %s configuration to previous stage: %v", *serviceDefinition.ServiceName, err)
return false
}
// Get current PRIMARY task set.
prevPrimaryTaskSet, err := client.GetPrimaryTaskSet(ctx, *service)
// Ignore error in case it's not found error, the prevPrimaryTaskSet doesn't exist for newly created Service.
if err != nil && !errors.Is(err, platformprovider.ErrNotFound) {
in.LogPersister.Errorf("Failed to determine current ECS PRIMARY taskSet of service %s for rollback: %v", *serviceDefinition.ServiceName, err)
return false
}
// On rolling back, the scale of desired tasks will be set to 100 (same as the original state).
taskSet, err := client.CreateTaskSet(ctx, *service, *td, targetGroup, 100)
if err != nil {
in.LogPersister.Errorf("Failed to create ECS task set %s: %v", *serviceDefinition.ServiceName, err)
return false
}
// Make new taskSet as PRIMARY task set, so that it will handle production service.
if _, err = client.UpdateServicePrimaryTaskSet(ctx, *service, *taskSet); err != nil {
in.LogPersister.Errorf("Failed to update PRIMARY ECS taskSet for service %s: %v", *serviceDefinition.ServiceName, err)
return false
}
// Remove old taskSet if existed.
if prevPrimaryTaskSet != nil {
if err = client.DeleteTaskSet(ctx, *service, *prevPrimaryTaskSet.TaskSetArn); err != nil {
in.LogPersister.Errorf("Failed to remove unused previous PRIMARY taskSet %s: %v", *prevPrimaryTaskSet.TaskSetArn, err)
return false
}
}
in.LogPersister.Infof("Rolled back the ECS service %s and task definition %s configuration to original stage", *serviceDefinition.ServiceName, *taskDefinition.Family)
return true
}