pulumi/pkg/engine/snapshot.go

45 lines
1.8 KiB
Go

// Copyright 2016-2018, Pulumi Corporation.
//
// 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 engine
import (
"io"
"github.com/pulumi/pulumi/pkg/v3/resource/deploy"
)
// SnapshotManager manages an in-memory resource graph.
type SnapshotManager interface {
io.Closer
// BeginMutation signals to the SnapshotManager that the planner intends to mutate the global
// snapshot. It provides the step that it intends to execute. Based on that step, BeginMutation
// will record this intent in the global snapshot and return a `SnapshotMutation` that, when ended,
// will complete the transaction.
BeginMutation(step deploy.Step) (SnapshotMutation, error)
// RegisterResourceOutputs registers the set of resource outputs generated by performing the
// given step. These outputs are persisted in the snapshot.
RegisterResourceOutputs(step deploy.Step) error
}
// SnapshotMutation represents an outstanding mutation that is yet to be completed. When the engine completes
// a mutation, it must call `End` in order to record the successful completion of the mutation.
type SnapshotMutation interface {
// End terminates the transaction and commits the results to the snapshot, returning an error if this
// failed to complete.
End(step deploy.Step, successful bool) error
}