92 lines
3.5 KiB
Go
92 lines
3.5 KiB
Go
// Copyright 2016-2018, Pulumi Corporation. All rights reserved.
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package deploy
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import (
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"crypto/sha256"
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"fmt"
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"time"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/resource"
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"github.com/pulumi/pulumi/pkg/tokens"
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"github.com/pulumi/pulumi/pkg/workspace"
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)
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// Snapshot is a view of a collection of resources in an stack at a point in time. It describes resources; their
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// IDs, names, and properties; their dependencies; and more. A snapshot is a diffable entity and can be used to create
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// or apply an infrastructure deployment plan in order to make reality match the snapshot state.
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type Snapshot struct {
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Stack tokens.QName // the stack being deployed into.
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Manifest Manifest // a deployment manifest of versions, checksums, and so on.
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Resources []*resource.State // fetches all resources and their associated states.
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}
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// Manifest captures versions for all binaries used to construct this snapshot.
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type Manifest struct {
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Time time.Time // the time this snapshot was taken.
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Magic string // a magic cookie.
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Version string // the pulumi command version.
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Plugins []workspace.PluginInfo // the plugin versions also loaded.
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}
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// NewMagic creates a magic cookie out of a manifest; this can be used to check for tampering. This ignores
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// any existing magic value already stored on the manifest.
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func (m Manifest) NewMagic() string {
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if m.Version == "" {
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return ""
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}
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return fmt.Sprintf("%x", sha256.Sum256([]byte(m.Version)))
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}
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// NewSnapshot creates a snapshot from the given arguments. The resources must be in topologically sorted order.
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// This property is not checked; for verification, please refer to the VerifyIntegrity function below.
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func NewSnapshot(stack tokens.QName, manifest Manifest, resources []*resource.State) *Snapshot {
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return &Snapshot{
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Stack: stack,
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Manifest: manifest,
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Resources: resources,
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}
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}
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// VerifyIntegrity checks a snapshot to ensure it is well-formed. Because of the cost of this operation,
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// integrity verification is only performed on demand, and not automatically during snapshot construction.
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func (snap *Snapshot) VerifyIntegrity() error {
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if snap != nil {
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// Ensure the magic cookie checks out.
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if snap.Manifest.Magic != snap.Manifest.NewMagic() {
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return errors.Errorf("magic cookie mismatch; possible tampering/corruption detected")
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}
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// Now check the resources. For now, we just verify that parents come before children, and that there aren't
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// any duplicate URNs. Eventually, we will capture the full resource DAG (see
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// https://github.com/pulumi/pulumi/issues/624), on which we can then do additional verification.
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urns := make(map[resource.URN]*resource.State)
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for i, state := range snap.Resources {
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urn := state.URN
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if par := state.Parent; par != "" {
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if _, has := urns[par]; !has {
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// The parent isn't there; to give a good error message, see whether it's missing entirely, or
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// whether it comes later in the snapshot (neither of which should ever happen).
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for _, other := range snap.Resources[i+1:] {
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if other.URN == par {
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return errors.Errorf("child resource %s's parent %s comes after it", urn, par)
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}
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}
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return errors.Errorf("child resource %s refers to missing parent %s", urn, par)
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}
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}
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if _, has := urns[urn]; has && !state.Delete {
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// The only time we should have duplicate URNs is when all but one of them are marked for deletion.
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return errors.Errorf("duplicate resource %s (not marked for deletion)", urn)
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}
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urns[urn] = state
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}
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}
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return nil
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}
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