114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
// Copyright 2018, Pulumi Corporation. All rights reserved.
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package engine
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import (
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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/resource/deploy"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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func Preview(u UpdateInfo, events chan<- Event, opts UpdateOptions) error {
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contract.Require(u != nil, "u")
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contract.Require(events != nil, "events")
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defer func() { events <- cancelEvent() }()
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ctx, err := newPlanContext(u)
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if err != nil {
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return err
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}
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defer ctx.Close()
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// Always set opts.DryRun to `true` when processing previews: if we do not do this, the engine will assume that it
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// should elide unknown input/output properties when interacting with the language and resource providers and we
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// will produce unexpected results.
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opts.DryRun = true
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emitter := makeEventEmitter(events, u)
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return preview(ctx, planOptions{
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UpdateOptions: opts,
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SourceFunc: newUpdateSource,
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Events: emitter,
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Diag: newEventSink(emitter),
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})
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}
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func preview(ctx *planContext, opts planOptions) error {
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result, err := plan(ctx, opts)
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if err != nil {
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return err
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}
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if result != nil {
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defer contract.IgnoreClose(result)
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// Make the current working directory the same as the program's, and restore it upon exit.
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done, err := result.Chdir()
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if err != nil {
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return err
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}
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defer done()
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if _, err := printPlan(result); err != nil {
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return err
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}
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}
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if !opts.Diag.Success() {
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// If any error occurred while walking the plan, be sure to let the developer know. Otherwise,
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// although error messages may have spewed to the output, the final lines of the plan may look fine.
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return errors.New("One or more errors occurred during the creation of this preview")
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}
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return nil
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}
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type previewActions struct {
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Ops map[deploy.StepOp]int
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Opts planOptions
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Seen map[resource.URN]deploy.Step
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}
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func newPreviewActions(opts planOptions) *previewActions {
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return &previewActions{
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Ops: make(map[deploy.StepOp]int),
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Opts: opts,
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Seen: make(map[resource.URN]deploy.Step),
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}
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}
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func (acts *previewActions) OnResourceStepPre(step deploy.Step) (interface{}, error) {
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acts.Seen[step.URN()] = step
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indent := getIndent(step, acts.Seen)
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summary := getResourcePropertiesSummary(step, indent)
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details := getResourcePropertiesDetails(step, indent, true, acts.Opts.Debug)
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acts.Opts.Events.resourcePreEvent(step, indent, summary, details)
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return nil, nil
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}
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func (acts *previewActions) OnResourceStepPost(ctx interface{},
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step deploy.Step, status resource.Status, err error) error {
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assertSeen(acts.Seen, step)
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// We let `printPlan` handle error reporting for now.
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if err == nil {
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// Track the operation if shown and/or if it is a logically meaningful operation.
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if step.Logical() {
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acts.Ops[step.Op()]++
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}
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_ = acts.OnResourceOutputs(step)
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}
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return nil
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}
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func (acts *previewActions) OnResourceOutputs(step deploy.Step) error {
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assertSeen(acts.Seen, step)
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indent := getIndent(step, acts.Seen)
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text := getResourceOutputsPropertiesString(step, indent, true, acts.Opts.Debug)
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acts.Opts.Events.resourceOutputsEvent(step, indent, text)
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return nil
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}
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