Previously, the engine would write to io.Writer's to display output. When hosted in `pulumi` these writers were tied to os.Stdout and os.Stderr, but other applications hosting the engine could send them other places (e.g. a log to be sent to an another application later). While much better than just using the ambient streams, this was still not the best. It would be ideal if the engine could just emit strongly typed events and whatever is hosting the engine could care about displaying them. As a first step down that road, we move to a model where operations on the engine now take a `chan engine.Event` and during the course of the operation, events are written to this channel. It is the responsibility of the caller of the method to read from the channel until it is closed (singifying that the operation is complete). The events we do emit are still intermingle presentation with data, which is unfortunate, but can be improved over time. Most of the events today are just colorized in the client and printed to stdout or stderr without much thought.
644 lines
20 KiB
Go
644 lines
20 KiB
Go
// Copyright 2017, Pulumi Corporation. All rights reserved.
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package engine
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import (
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"bytes"
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"fmt"
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"sort"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/diag/colors"
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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/resource/plugin"
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"github.com/pulumi/pulumi/pkg/tokens"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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// plan just uses the standard logic to parse arguments, options, and to create a snapshot and plan.
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func (eng *Engine) plan(info *planContext, opts deployOptions) (*planResult, error) {
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contract.Assert(info != nil)
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contract.Assert(info.Target != nil)
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// Create a context for plugins.
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ctx, err := plugin.NewContext(opts.Diag, nil)
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if err != nil {
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return nil, err
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}
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// First, load the package metadata, in preparation for executing it and creating resources.
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pkginfo, err := eng.readPackageFromArg(info.PackageArg)
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if err != nil {
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return nil, errors.Errorf("Error loading package: %v", err)
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}
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contract.Assert(pkginfo != nil)
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// If that succeeded, create a new source that will perform interpretation of the compiled program.
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// TODO[pulumi/pulumi#88]: we are passing `nil` as the arguments map; we need to allow a way to pass these.
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source := deploy.NewEvalSource(ctx, &deploy.EvalRunInfo{
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Pkg: pkginfo.Pkg,
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Pwd: pkginfo.Root,
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Config: info.Target.Config,
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}, opts.Destroy, opts.DryRun)
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// If there are any analyzers in the project file, add them.
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var analyzers []tokens.QName
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if as := pkginfo.Pkg.Analyzers; as != nil {
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for _, a := range *as {
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analyzers = append(analyzers, a)
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}
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}
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// Append any analyzers from the command line.
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for _, a := range opts.Analyzers {
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analyzers = append(analyzers, tokens.QName(a))
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}
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// Generate a plan; this API handles all interesting cases (create, update, delete).
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plan := deploy.NewPlan(ctx, info.Target, info.Snapshot, source, analyzers)
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return &planResult{
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Ctx: ctx,
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Info: info,
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Plan: plan,
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Options: opts,
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}, nil
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}
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type planResult struct {
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Ctx *plugin.Context // the context containing plugins and their state.
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Info *planContext // plan command information.
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Plan *deploy.Plan // the plan created by this command.
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Options deployOptions // the deployment options.
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}
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// StepActions is used to process a plan's steps.
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type StepActions interface {
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// Run is invoked to perform whatever action the implementer uses to process the step.
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Run(step deploy.Step) (resource.Status, error)
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}
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// Walk enumerates all steps in the plan, calling out to the provided action at each step. It returns four things: the
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// resulting Snapshot, no matter whether an error occurs or not; an error, if something went wrong; the step that
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// failed, if the error is non-nil; and finally the state of the resource modified in the failing step.
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func (res *planResult) Walk(actions StepActions) (deploy.PlanSummary, deploy.Step, resource.Status, error) {
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opts := deploy.Options{
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Parallel: res.Options.Parallel,
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}
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// Fetch a plan iterator and keep walking it until we are done.
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iter, err := res.Plan.Start(opts)
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if err != nil {
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return nil, nil, resource.StatusOK, err
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}
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step, err := iter.Next()
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if err != nil {
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_ = iter.Close() // ignore close errors; the Next error trumps
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return nil, nil, resource.StatusOK, err
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}
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for step != nil {
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// Perform any per-step actions.
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rst, err := actions.Run(step)
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// If an error occurred, exit early.
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if err != nil {
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_ = iter.Close() // ignore close errors; the action error trumps
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return iter, step, rst, err
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}
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contract.Assert(rst == resource.StatusOK)
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step, err = iter.Next()
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if err != nil {
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_ = iter.Close() // ignore close errors; the action error trumps
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return iter, step, resource.StatusOK, err
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}
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}
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// Finally, return a summary and the resulting plan information.
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return iter, nil, resource.StatusOK, iter.Close()
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}
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func (res *planResult) Close() error {
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return res.Ctx.Close()
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}
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type previewActions struct {
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Summary bytes.Buffer
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Ops map[deploy.StepOp]int
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Opts deployOptions
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}
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func (acts *previewActions) Run(step deploy.Step) (resource.Status, error) {
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// Print this step information (resource and all its properties).
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if shouldShow(step, acts.Opts) {
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printStep(&acts.Summary, step, acts.Opts.Summary, true, "")
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}
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// Be sure to skip the step so that in-memory state updates are performed.
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err := step.Skip()
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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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}
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return resource.StatusOK, err
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}
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func (eng *Engine) printPlan(result *planResult) error {
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// First print config/unchanged/etc. if necessary.
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var prelude bytes.Buffer
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printPrelude(&prelude, result, true)
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// Now walk the plan's steps and and pretty-print them out.
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prelude.WriteString(fmt.Sprintf("%vPreviewing changes:%v\n", colors.SpecUnimportant, colors.Reset))
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result.Options.Events <- stdOutEventWithColor(&prelude)
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actions := &previewActions{
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Ops: make(map[deploy.StepOp]int),
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Opts: result.Options,
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}
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_, _, _, err := result.Walk(actions)
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if err != nil {
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return errors.Errorf("An error occurred while advancing the preview: %v", err)
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}
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if !result.Options.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 this preview")
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}
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// Print a summary of operation counts.
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printChangeSummary(&actions.Summary, actions.Ops, true)
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result.Options.Events <- stdOutEventWithColor(&actions.Summary)
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return nil
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}
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// shouldShow returns true if a step should show in the output.
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func shouldShow(step deploy.Step, opts deployOptions) bool {
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// For certain operations, whether they are tracked is controlled by flags (to cut down on superfluous output).
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if step.Op() == deploy.OpSame {
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return opts.ShowSames
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} else if step.Op() == deploy.OpCreateReplacement || step.Op() == deploy.OpDeleteReplaced {
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return opts.ShowReplacementSteps
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} else if step.Op() == deploy.OpReplace {
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return !opts.ShowReplacementSteps
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}
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return true
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}
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func printPrelude(b *bytes.Buffer, result *planResult, planning bool) {
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// If there are configuration variables, show them.
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if result.Options.ShowConfig {
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printConfig(b, result.Info.Target.Config)
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}
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}
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func printConfig(b *bytes.Buffer, config map[tokens.ModuleMember]string) {
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b.WriteString(fmt.Sprintf("%vConfiguration:%v\n", colors.SpecUnimportant, colors.Reset))
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if config != nil {
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var keys []string
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for key := range config {
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keys = append(keys, string(key))
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}
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sort.Strings(keys)
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for _, key := range keys {
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b.WriteString(fmt.Sprintf("%v%v: %v\n", detailsIndent, key, config[tokens.ModuleMember(key)]))
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}
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}
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}
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func printChangeSummary(b *bytes.Buffer, counts map[deploy.StepOp]int, preview bool) int {
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changes := 0
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for op, c := range counts {
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if op != deploy.OpSame {
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changes += c
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}
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}
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var kind string
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if preview {
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kind = "previewed"
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} else {
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kind = "performed"
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}
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var changesLabel string
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if changes == 0 {
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kind = "required"
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changesLabel = "no"
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} else {
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changesLabel = strconv.Itoa(changes)
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}
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b.WriteString(fmt.Sprintf("%vinfo%v: %v %v %v:\n",
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colors.SpecInfo, colors.Reset, changesLabel, plural("change", changes), kind))
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var planTo string
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if preview {
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planTo = "to "
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}
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// Now summarize all of the changes; we print sames a little differently.
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for _, op := range deploy.StepOps {
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if op != deploy.OpSame {
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if c := counts[op]; c > 0 {
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opDescription := string(op)
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if !preview {
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opDescription = op.PastTense()
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}
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b.WriteString(fmt.Sprintf(" %v%v %v %v%v%v\n",
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op.Prefix(), c, plural("resource", c), planTo, opDescription, colors.Reset))
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}
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}
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}
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if c := counts[deploy.OpSame]; c > 0 {
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b.WriteString(fmt.Sprintf(" %v %v unchanged\n", c, plural("resource", c)))
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}
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return changes
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}
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func plural(s string, c int) string {
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if c != 1 {
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s += "s"
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}
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return s
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}
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const detailsIndent = " " // 4 spaces, plus 2 for "+ ", "- ", and " " leaders
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func printStep(b *bytes.Buffer, step deploy.Step, summary bool, planning bool, indent string) {
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// First print out the operation's prefix.
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b.WriteString(step.Op().Prefix())
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// Next, print the resource type (since it is easy on the eyes and can be quickly identified).
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printStepHeader(b, step)
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b.WriteString(step.Op().Suffix())
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// Next print the resource URN, properties, etc.
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if mut, ismut := step.(deploy.MutatingStep); ismut {
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var replaces []resource.PropertyKey
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if step.Op() == deploy.OpCreateReplacement {
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replaces = step.(*deploy.CreateStep).Keys()
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} else if step.Op() == deploy.OpReplace {
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replaces = step.(*deploy.ReplaceStep).Keys()
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}
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printResourceProperties(b, mut.URN(), mut.Old(), mut.New(), replaces, summary, planning, indent)
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} else {
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contract.Failf("Expected each step to either be mutating or read-only")
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}
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// Finally make sure to reset the color.
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b.WriteString(colors.Reset)
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}
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func printStepHeader(b *bytes.Buffer, step deploy.Step) {
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b.WriteString(fmt.Sprintf("%s: (%s)\n", string(step.Type()), step.Op()))
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}
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func printResourceProperties(b *bytes.Buffer, urn resource.URN, old *resource.State, new *resource.State,
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replaces []resource.PropertyKey, summary bool, planning bool, indent string) {
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indent += detailsIndent
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// Print out the URN and, if present, the ID, as "pseudo-properties".
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var id resource.ID
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if old != nil {
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id = old.ID
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}
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if id != "" {
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b.WriteString(fmt.Sprintf("%s[id=%s]\n", indent, string(id)))
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}
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if urn != "" {
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b.WriteString(fmt.Sprintf("%s[urn=%s]\n", indent, urn))
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}
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if !summary {
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// Print all of the properties associated with this resource.
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if old == nil && new != nil {
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printObject(b, new.AllInputs(), planning, indent)
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} else if new == nil && old != nil {
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printObject(b, old.AllInputs(), planning, indent)
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} else {
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printOldNewDiffs(b, old.AllInputs(), new.AllInputs(), replaces, planning, indent)
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}
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}
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}
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func maxKey(keys []resource.PropertyKey) int {
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maxkey := 0
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for _, k := range keys {
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if len(k) > maxkey {
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maxkey = len(k)
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}
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}
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return maxkey
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}
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func printObject(b *bytes.Buffer, props resource.PropertyMap, planning bool, indent string) {
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// Compute the maximum with of property keys so we can justify everything.
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keys := props.StableKeys()
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maxkey := maxKey(keys)
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// Now print out the values intelligently based on the type.
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for _, k := range keys {
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if v := props[k]; shouldPrintPropertyValue(v, planning) {
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printPropertyTitle(b, k, maxkey, indent)
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printPropertyValue(b, v, planning, indent)
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}
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}
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}
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// printResourceOutputProperties prints only those properties that either differ from the input properties or, if
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// there is an old snapshot of the resource, differ from the prior old snapshot's output properties.
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func printResourceOutputProperties(b *bytes.Buffer, step deploy.Step, indent string) {
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// Only certain kinds of steps have output properties associated with them.
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mut := step.(deploy.MutatingStep)
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if mut == nil ||
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(step.Op() != deploy.OpCreate &&
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step.Op() != deploy.OpCreateReplacement &&
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step.Op() != deploy.OpUpdate) {
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return
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}
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indent += detailsIndent
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b.WriteString(step.Op().Color())
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b.WriteString(step.Op().Suffix())
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// First fetch all the relevant property maps that we may consult.
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newins := mut.New().Inputs
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newouts := mut.New().Outputs
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var oldouts resource.PropertyMap
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if old := mut.Old(); old != nil {
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oldouts = old.Outputs
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}
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// Now sort the keys and enumerate each output property in a deterministic order.
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firstout := true
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keys := newouts.StableKeys()
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maxkey := maxKey(keys)
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for _, k := range keys {
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newout := newouts[k]
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// Print this property if it is printable, and one of these cases
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// 1) new ins has it and it's different;
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// 2) new ins doesn't have it, but old outs does, and it's different;
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// 3) neither old outs nor new ins contain it;
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if shouldPrintPropertyValue(newout, true) {
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var print bool
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if newin, has := newins[k]; has {
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print = (newout.Diff(newin) != nil) // case 1
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} else if oldouts != nil {
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if oldout, has := oldouts[k]; has {
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print = (newout.Diff(oldout) != nil) // case 2
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} else {
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print = true // case 3
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}
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} else {
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print = true // also case 3
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}
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if print {
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if firstout {
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b.WriteString(fmt.Sprintf("%v---outputs:---\n", indent))
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firstout = false
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}
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printPropertyTitle(b, k, maxkey, indent)
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printPropertyValue(b, newout, false, indent)
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}
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}
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}
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b.WriteString(colors.Reset)
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}
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func shouldPrintPropertyValue(v resource.PropertyValue, outs bool) bool {
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if v.IsNull() {
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// by default, don't print nulls (they just clutter up the output)
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return false
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}
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if v.IsOutput() && !outs {
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// also don't show output properties until the outs parameter tells us to.
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return false
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}
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return true
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}
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func printPropertyTitle(b *bytes.Buffer, k resource.PropertyKey, align int, indent string) {
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b.WriteString(fmt.Sprintf("%s%-"+strconv.Itoa(align)+"s: ", indent, k))
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}
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func printPropertyValue(b *bytes.Buffer, v resource.PropertyValue, planning bool, indent string) {
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if v.IsNull() {
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b.WriteString("<null>")
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} else if v.IsBool() {
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b.WriteString(fmt.Sprintf("%t", v.BoolValue()))
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} else if v.IsNumber() {
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b.WriteString(fmt.Sprintf("%v", v.NumberValue()))
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} else if v.IsString() {
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b.WriteString(fmt.Sprintf("%q", v.StringValue()))
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} else if v.IsArray() {
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arr := v.ArrayValue()
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if len(arr) == 0 {
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b.WriteString("[]")
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} else {
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b.WriteString(fmt.Sprintf("[\n"))
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for i, elem := range arr {
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newIndent := printArrayElemHeader(b, i, indent)
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printPropertyValue(b, elem, planning, newIndent)
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}
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b.WriteString(fmt.Sprintf("%s]", indent))
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}
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} else if v.IsAsset() {
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a := v.AssetValue()
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if text, has := a.GetText(); has {
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b.WriteString("asset {\n")
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// pretty print the text, line by line, with proper breaks.
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lines := strings.Split(text, "\n")
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for _, line := range lines {
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b.WriteString(fmt.Sprintf("%v \"%v\"\n", indent, line))
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}
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b.WriteString(fmt.Sprintf("%v}", indent))
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} else if path, has := a.GetPath(); has {
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b.WriteString(fmt.Sprintf("asset { file://%v }", path))
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} else {
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contract.Assert(a.IsURI())
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b.WriteString(fmt.Sprintf("asset { %v }", a.URI))
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}
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} else if v.IsArchive() {
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a := v.ArchiveValue()
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if assets, has := a.GetAssets(); has {
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b.WriteString("archive {\n")
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var names []string
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for name := range assets {
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names = append(names, name)
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}
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sort.Strings(names)
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for _, name := range names {
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b.WriteString(fmt.Sprintf("%v \"%v\": ", indent, name))
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printPropertyValue(b, resource.NewAssetProperty(assets[name]), planning, indent+" ")
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}
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b.WriteString(fmt.Sprintf("%v}", indent))
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} else if path, has := a.GetPath(); has {
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b.WriteString(fmt.Sprintf("archive { file://%v }", path))
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} else {
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contract.Assert(a.IsURI())
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b.WriteString(fmt.Sprintf("archive { %v }", a.URI))
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}
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} else if v.IsComputed() || v.IsOutput() {
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|
b.WriteString(v.TypeString())
|
|
} else {
|
|
contract.Assert(v.IsObject())
|
|
obj := v.ObjectValue()
|
|
if len(obj) == 0 {
|
|
b.WriteString("{}")
|
|
} else {
|
|
b.WriteString("{\n")
|
|
printObject(b, obj, planning, indent+" ")
|
|
b.WriteString(fmt.Sprintf("%s}", indent))
|
|
}
|
|
}
|
|
b.WriteString("\n")
|
|
}
|
|
|
|
func getArrayElemHeader(b *bytes.Buffer, i int, indent string) (string, string) {
|
|
prefix := fmt.Sprintf(" %s[%d]: ", indent, i)
|
|
return prefix, fmt.Sprintf("%-"+strconv.Itoa(len(prefix))+"s", "")
|
|
}
|
|
|
|
func printArrayElemHeader(b *bytes.Buffer, i int, indent string) string {
|
|
prefix, newIndent := getArrayElemHeader(b, i, indent)
|
|
b.WriteString(prefix)
|
|
return newIndent
|
|
}
|
|
|
|
func printOldNewDiffs(b *bytes.Buffer, olds resource.PropertyMap, news resource.PropertyMap,
|
|
replaces []resource.PropertyKey, planning bool, indent string) {
|
|
// Get the full diff structure between the two, and print it (recursively).
|
|
if diff := olds.Diff(news); diff != nil {
|
|
printObjectDiff(b, *diff, replaces, false, planning, indent)
|
|
} else {
|
|
printObject(b, news, planning, indent)
|
|
}
|
|
}
|
|
|
|
func printObjectDiff(b *bytes.Buffer, diff resource.ObjectDiff,
|
|
replaces []resource.PropertyKey, causedReplace bool, planning bool, indent string) {
|
|
contract.Assert(len(indent) > 2)
|
|
|
|
// Compute the maximum with of property keys so we can justify everything.
|
|
keys := diff.Keys()
|
|
maxkey := maxKey(keys)
|
|
|
|
// If a list of what causes a resource to get replaced exist, create a handy map.
|
|
var replaceMap map[resource.PropertyKey]bool
|
|
if len(replaces) > 0 {
|
|
replaceMap = make(map[resource.PropertyKey]bool)
|
|
for _, k := range replaces {
|
|
replaceMap[k] = true
|
|
}
|
|
}
|
|
|
|
// To print an object diff, enumerate the keys in stable order, and print each property independently.
|
|
for _, k := range keys {
|
|
title := func(id string) { printPropertyTitle(b, k, maxkey, id) }
|
|
if add, isadd := diff.Adds[k]; isadd {
|
|
if shouldPrintPropertyValue(add, planning) {
|
|
b.WriteString(colors.SpecCreate)
|
|
title(addIndent(indent))
|
|
printPropertyValue(b, add, planning, addIndent(indent))
|
|
b.WriteString(colors.Reset)
|
|
}
|
|
} else if delete, isdelete := diff.Deletes[k]; isdelete {
|
|
if shouldPrintPropertyValue(delete, planning) {
|
|
b.WriteString(colors.SpecDelete)
|
|
title(deleteIndent(indent))
|
|
printPropertyValue(b, delete, planning, deleteIndent(indent))
|
|
b.WriteString(colors.Reset)
|
|
}
|
|
} else if update, isupdate := diff.Updates[k]; isupdate {
|
|
if !causedReplace && replaceMap != nil {
|
|
causedReplace = replaceMap[k]
|
|
}
|
|
printPropertyValueDiff(b, title, update, causedReplace, planning, indent)
|
|
} else if same := diff.Sames[k]; shouldPrintPropertyValue(same, planning) {
|
|
title(indent)
|
|
printPropertyValue(b, diff.Sames[k], planning, indent)
|
|
}
|
|
}
|
|
}
|
|
|
|
func printPropertyValueDiff(b *bytes.Buffer, title func(string), diff resource.ValueDiff,
|
|
causedReplace bool, planning bool, indent string) {
|
|
contract.Assert(len(indent) > 2)
|
|
|
|
if diff.Array != nil {
|
|
title(indent)
|
|
b.WriteString("[\n")
|
|
|
|
a := diff.Array
|
|
for i := 0; i < a.Len(); i++ {
|
|
_, newIndent := getArrayElemHeader(b, i, indent)
|
|
titleFunc := func(id string) { printArrayElemHeader(b, i, id) }
|
|
if add, isadd := a.Adds[i]; isadd {
|
|
b.WriteString(deploy.OpCreate.Color())
|
|
titleFunc(addIndent(indent))
|
|
printPropertyValue(b, add, planning, addIndent(newIndent))
|
|
b.WriteString(colors.Reset)
|
|
} else if delete, isdelete := a.Deletes[i]; isdelete {
|
|
b.WriteString(deploy.OpDelete.Color())
|
|
titleFunc(deleteIndent(indent))
|
|
printPropertyValue(b, delete, planning, deleteIndent(newIndent))
|
|
b.WriteString(colors.Reset)
|
|
} else if update, isupdate := a.Updates[i]; isupdate {
|
|
printPropertyValueDiff(b, title, update, causedReplace, planning, indent)
|
|
} else {
|
|
titleFunc(indent)
|
|
printPropertyValue(b, a.Sames[i], planning, newIndent)
|
|
}
|
|
}
|
|
b.WriteString(fmt.Sprintf("%s]\n", indent))
|
|
} else if diff.Object != nil {
|
|
title(indent)
|
|
b.WriteString("{\n")
|
|
printObjectDiff(b, *diff.Object, nil, causedReplace, planning, indent+" ")
|
|
b.WriteString(fmt.Sprintf("%s}\n", indent))
|
|
} else {
|
|
// If we ended up here, the two values either differ by type, or they have different primitive values. We will
|
|
// simply emit a deletion line followed by an addition line.
|
|
if shouldPrintPropertyValue(diff.Old, false) {
|
|
var color string
|
|
if causedReplace {
|
|
color = deploy.OpDelete.Color() // this property triggered replacement; color as a delete
|
|
} else {
|
|
color = deploy.OpUpdate.Color()
|
|
}
|
|
b.WriteString(color)
|
|
title(deleteIndent(indent))
|
|
printPropertyValue(b, diff.Old, planning, deleteIndent(indent))
|
|
b.WriteString(colors.Reset)
|
|
}
|
|
if shouldPrintPropertyValue(diff.New, false) {
|
|
var color string
|
|
if causedReplace {
|
|
color = deploy.OpCreate.Color() // this property triggered replacement; color as a create
|
|
} else {
|
|
color = deploy.OpUpdate.Color()
|
|
}
|
|
b.WriteString(color)
|
|
title(addIndent(indent))
|
|
printPropertyValue(b, diff.New, planning, addIndent(indent))
|
|
b.WriteString(colors.Reset)
|
|
}
|
|
}
|
|
}
|
|
|
|
func addIndent(indent string) string { return indent[:len(indent)-2] + "+ " }
|
|
func deleteIndent(indent string) string { return indent[:len(indent)-2] + "- " }
|