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rollback.go
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rollback.go
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// Copyright 2020 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 terraform
import (
"context"
provider "github.com/pipe-cd/pipecd/pkg/app/piped/cloudprovider/terraform"
"github.com/pipe-cd/pipecd/pkg/app/piped/executor"
"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 terraform 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 {
// There is nothing to do if 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
}
_, cloudProviderCfg, found := findCloudProvider(&e.Input)
if !found {
return model.StageStatus_STAGE_FAILURE
}
ds, err := e.RunningDSP.Get(ctx, e.LogPersister)
if err != nil {
e.LogPersister.Errorf("Failed to prepare running deploy source data (%v)", err)
return model.StageStatus_STAGE_FAILURE
}
appCfg := ds.ApplicationConfig.TerraformApplicationSpec
if appCfg == nil {
e.LogPersister.Error("Malformed application configuration: missing TerraformApplicationSpec")
return model.StageStatus_STAGE_FAILURE
}
terraformPath, ok := findTerraform(ctx, appCfg.Input.TerraformVersion, e.LogPersister)
if !ok {
return model.StageStatus_STAGE_FAILURE
}
vars := make([]string, 0, len(cloudProviderCfg.Vars)+len(appCfg.Input.Vars))
vars = append(vars, cloudProviderCfg.Vars...)
vars = append(vars, appCfg.Input.Vars...)
e.LogPersister.Infof("Start rolling back to the state defined at commit %s", e.Deployment.RunningCommitHash)
var (
flags = appCfg.Input.CommandFlags
envs = appCfg.Input.CommandEnvs
cmd = provider.NewTerraform(
terraformPath,
ds.AppDir,
provider.WithVars(vars),
provider.WithVarFiles(appCfg.Input.VarFiles),
provider.WithAdditionalFlags(flags.Shared, flags.Init, flags.Plan, flags.Apply),
provider.WithAdditionalEnvs(envs.Shared, envs.Init, envs.Plan, envs.Apply),
)
)
if ok := showUsingVersion(ctx, cmd, e.LogPersister); !ok {
return model.StageStatus_STAGE_FAILURE
}
if err := cmd.Init(ctx, e.LogPersister); err != nil {
e.LogPersister.Errorf("Failed to init (%v)", err)
return model.StageStatus_STAGE_FAILURE
}
if ok := selectWorkspace(ctx, cmd, appCfg.Input.Workspace, e.LogPersister); !ok {
return model.StageStatus_STAGE_FAILURE
}
if err := cmd.Apply(ctx, e.LogPersister); err != nil {
e.LogPersister.Errorf("Failed to apply changes (%v)", err)
return model.StageStatus_STAGE_FAILURE
}
e.LogPersister.Success("Successfully rolled back the changes")
return model.StageStatus_STAGE_SUCCESS
}