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2020 lines (1792 loc) · 62.1 KB
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package format
import (
"bufio"
"bytes"
"fmt"
"log"
"sort"
"strings"
"github.com/mitchellh/colorstring"
"github.com/zclconf/go-cty/cty"
ctyjson "github.com/zclconf/go-cty/cty/json"
"github.com/hashicorp/terraform/internal/addrs"
"github.com/hashicorp/terraform/internal/configs/configschema"
"github.com/hashicorp/terraform/internal/lang/marks"
"github.com/hashicorp/terraform/internal/plans"
"github.com/hashicorp/terraform/internal/plans/objchange"
"github.com/hashicorp/terraform/internal/states"
)
// DiffLanguage controls the description of the resource change reasons.
type DiffLanguage rune
//go:generate go run golang.org/x/tools/cmd/stringer -type=DiffLanguage diff.go
const (
// DiffLanguageProposedChange indicates that the change is one which is
// planned to be applied.
DiffLanguageProposedChange DiffLanguage = 'P'
// DiffLanguageDetectedDrift indicates that the change is detected drift
// from the configuration.
DiffLanguageDetectedDrift DiffLanguage = 'D'
)
// ResourceChange returns a string representation of a change to a particular
// resource, for inclusion in user-facing plan output.
//
// The resource schema must be provided along with the change so that the
// formatted change can reflect the configuration structure for the associated
// resource.
//
// If "color" is non-nil, it will be used to color the result. Otherwise,
// no color codes will be included.
func ResourceChange(
change *plans.ResourceInstanceChangeSrc,
schema *configschema.Block,
color *colorstring.Colorize,
language DiffLanguage,
) string {
addr := change.Addr
var buf bytes.Buffer
if color == nil {
color = &colorstring.Colorize{
Colors: colorstring.DefaultColors,
Disable: true,
Reset: false,
}
}
dispAddr := addr.String()
if change.DeposedKey != states.NotDeposed {
dispAddr = fmt.Sprintf("%s (deposed object %s)", dispAddr, change.DeposedKey)
}
switch change.Action {
case plans.Create:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] will be created"), dispAddr))
case plans.Read:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] will be read during apply\n # (config refers to values not yet known)"), dispAddr))
case plans.Update:
switch language {
case DiffLanguageProposedChange:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] will be updated in-place"), dispAddr))
case DiffLanguageDetectedDrift:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] has changed"), dispAddr))
default:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] update (unknown reason %s)"), dispAddr, language))
}
case plans.CreateThenDelete, plans.DeleteThenCreate:
switch change.ActionReason {
case plans.ResourceInstanceReplaceBecauseTainted:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] is tainted, so must be [bold][red]replaced"), dispAddr))
case plans.ResourceInstanceReplaceByRequest:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] will be [bold][red]replaced[reset], as requested"), dispAddr))
default:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] must be [bold][red]replaced"), dispAddr))
}
case plans.Delete:
switch language {
case DiffLanguageProposedChange:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] will be [bold][red]destroyed"), dispAddr))
case DiffLanguageDetectedDrift:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] has been deleted"), dispAddr))
default:
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] delete (unknown reason %s)"), dispAddr, language))
}
// We can sometimes give some additional detail about why we're
// proposing to delete. We show this as additional notes, rather than
// as additional wording in the main action statement, in an attempt
// to make the "will be destroyed" message prominent and consistent
// in all cases, for easier scanning of this often-risky action.
switch change.ActionReason {
case plans.ResourceInstanceDeleteBecauseNoResourceConfig:
buf.WriteString(fmt.Sprintf("\n # (because %s is not in configuration)", addr.Resource.Resource))
case plans.ResourceInstanceDeleteBecauseNoModule:
// FIXME: Ideally we'd truncate addr.Module to reflect the earliest
// step that doesn't exist, so it's clearer which call this refers
// to, but we don't have enough information out here in the UI layer
// to decide that; only the "expander" in Terraform Core knows
// which module instance keys are actually declared.
buf.WriteString(fmt.Sprintf("\n # (because %s is not in configuration)", addr.Module))
case plans.ResourceInstanceDeleteBecauseWrongRepetition:
// We have some different variations of this one
switch addr.Resource.Key.(type) {
case nil:
buf.WriteString("\n # (because resource uses count or for_each)")
case addrs.IntKey:
buf.WriteString("\n # (because resource does not use count)")
case addrs.StringKey:
buf.WriteString("\n # (because resource does not use for_each)")
}
case plans.ResourceInstanceDeleteBecauseCountIndex:
buf.WriteString(fmt.Sprintf("\n # (because index %s is out of range for count)", addr.Resource.Key))
case plans.ResourceInstanceDeleteBecauseEachKey:
buf.WriteString(fmt.Sprintf("\n # (because key %s is not in for_each map)", addr.Resource.Key))
}
if change.DeposedKey != states.NotDeposed {
// Some extra context about this unusual situation.
buf.WriteString(color.Color("\n # (left over from a partially-failed replacement of this instance)"))
}
case plans.NoOp:
if change.Moved() {
buf.WriteString(fmt.Sprintf(color.Color("[bold] # %s[reset] has moved to [bold]%s[reset]"), change.PrevRunAddr.String(), dispAddr))
break
}
fallthrough
default:
// should never happen, since the above is exhaustive
buf.WriteString(fmt.Sprintf("%s has an action the plan renderer doesn't support (this is a bug)", dispAddr))
}
buf.WriteString(color.Color("[reset]\n"))
if change.Moved() && change.Action != plans.NoOp {
buf.WriteString(fmt.Sprintf(color.Color(" # [reset](moved from %s)\n"), change.PrevRunAddr.String()))
}
if change.Moved() && change.Action == plans.NoOp {
buf.WriteString(" ")
} else {
buf.WriteString(color.Color(DiffActionSymbol(change.Action)) + " ")
}
switch addr.Resource.Resource.Mode {
case addrs.ManagedResourceMode:
buf.WriteString(fmt.Sprintf(
"resource %q %q",
addr.Resource.Resource.Type,
addr.Resource.Resource.Name,
))
case addrs.DataResourceMode:
buf.WriteString(fmt.Sprintf(
"data %q %q ",
addr.Resource.Resource.Type,
addr.Resource.Resource.Name,
))
default:
// should never happen, since the above is exhaustive
buf.WriteString(addr.String())
}
buf.WriteString(" {")
p := blockBodyDiffPrinter{
buf: &buf,
color: color,
action: change.Action,
requiredReplace: change.RequiredReplace,
}
// Most commonly-used resources have nested blocks that result in us
// going at least three traversals deep while we recurse here, so we'll
// start with that much capacity and then grow as needed for deeper
// structures.
path := make(cty.Path, 0, 3)
changeV, err := change.Decode(schema.ImpliedType())
if err != nil {
// Should never happen in here, since we've already been through
// loads of layers of encode/decode of the planned changes before now.
panic(fmt.Sprintf("failed to decode plan for %s while rendering diff: %s", addr, err))
}
// We currently have an opt-out that permits the legacy SDK to return values
// that defy our usual conventions around handling of nesting blocks. To
// avoid the rendering code from needing to handle all of these, we'll
// normalize first.
// (Ideally we'd do this as part of the SDK opt-out implementation in core,
// but we've added it here for now to reduce risk of unexpected impacts
// on other code in core.)
changeV.Change.Before = objchange.NormalizeObjectFromLegacySDK(changeV.Change.Before, schema)
changeV.Change.After = objchange.NormalizeObjectFromLegacySDK(changeV.Change.After, schema)
result := p.writeBlockBodyDiff(schema, changeV.Before, changeV.After, 6, path)
if result.bodyWritten {
buf.WriteString("\n")
buf.WriteString(strings.Repeat(" ", 4))
}
buf.WriteString("}\n")
return buf.String()
}
// OutputChanges returns a string representation of a set of changes to output
// values for inclusion in user-facing plan output.
//
// If "color" is non-nil, it will be used to color the result. Otherwise,
// no color codes will be included.
func OutputChanges(
changes []*plans.OutputChangeSrc,
color *colorstring.Colorize,
) string {
var buf bytes.Buffer
p := blockBodyDiffPrinter{
buf: &buf,
color: color,
action: plans.Update, // not actually used in this case, because we're not printing a containing block
}
// We're going to reuse the codepath we used for printing resource block
// diffs, by pretending that the set of defined outputs are the attributes
// of some resource. It's a little forced to do this, but it gives us all
// the same formatting heuristics as we normally use for resource
// attributes.
oldVals := make(map[string]cty.Value, len(changes))
newVals := make(map[string]cty.Value, len(changes))
synthSchema := &configschema.Block{
Attributes: make(map[string]*configschema.Attribute, len(changes)),
}
for _, changeSrc := range changes {
name := changeSrc.Addr.OutputValue.Name
change, err := changeSrc.Decode()
if err != nil {
// It'd be weird to get a decoding error here because that would
// suggest that Terraform itself just produced an invalid plan, and
// we don't have any good way to ignore it in this codepath, so
// we'll just log it and ignore it.
log.Printf("[ERROR] format.OutputChanges: Failed to decode planned change for output %q: %s", name, err)
continue
}
synthSchema.Attributes[name] = &configschema.Attribute{
Type: cty.DynamicPseudoType, // output types are decided dynamically based on the given value
Optional: true,
Sensitive: change.Sensitive,
}
oldVals[name] = change.Before
newVals[name] = change.After
}
p.writeBlockBodyDiff(synthSchema, cty.ObjectVal(oldVals), cty.ObjectVal(newVals), 2, nil)
return buf.String()
}
type blockBodyDiffPrinter struct {
buf *bytes.Buffer
color *colorstring.Colorize
action plans.Action
requiredReplace cty.PathSet
// verbose is set to true when using the "diff" printer to format state
verbose bool
}
type blockBodyDiffResult struct {
bodyWritten bool
skippedAttributes int
skippedBlocks int
}
const forcesNewResourceCaption = " [red]# forces replacement[reset]"
// writeBlockBodyDiff writes attribute or block differences
// and returns true if any differences were found and written
func (p *blockBodyDiffPrinter) writeBlockBodyDiff(schema *configschema.Block, old, new cty.Value, indent int, path cty.Path) blockBodyDiffResult {
path = ctyEnsurePathCapacity(path, 1)
result := blockBodyDiffResult{}
// write the attributes diff
blankBeforeBlocks := p.writeAttrsDiff(schema.Attributes, old, new, indent, path, &result)
p.writeSkippedAttr(result.skippedAttributes, indent+2)
{
blockTypeNames := make([]string, 0, len(schema.BlockTypes))
for name := range schema.BlockTypes {
blockTypeNames = append(blockTypeNames, name)
}
sort.Strings(blockTypeNames)
for _, name := range blockTypeNames {
blockS := schema.BlockTypes[name]
oldVal := ctyGetAttrMaybeNull(old, name)
newVal := ctyGetAttrMaybeNull(new, name)
result.bodyWritten = true
skippedBlocks := p.writeNestedBlockDiffs(name, blockS, oldVal, newVal, blankBeforeBlocks, indent, path)
if skippedBlocks > 0 {
result.skippedBlocks += skippedBlocks
}
// Always include a blank for any subsequent block types.
blankBeforeBlocks = true
}
if result.skippedBlocks > 0 {
noun := "blocks"
if result.skippedBlocks == 1 {
noun = "block"
}
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString(fmt.Sprintf(p.color.Color("[dark_gray]# (%d unchanged %s hidden)[reset]"), result.skippedBlocks, noun))
}
}
return result
}
func (p *blockBodyDiffPrinter) writeAttrsDiff(
attrsS map[string]*configschema.Attribute,
old, new cty.Value,
indent int,
path cty.Path,
result *blockBodyDiffResult) bool {
blankBeforeBlocks := false
attrNames := make([]string, 0, len(attrsS))
attrNameLen := 0
for name := range attrsS {
oldVal := ctyGetAttrMaybeNull(old, name)
newVal := ctyGetAttrMaybeNull(new, name)
if oldVal.IsNull() && newVal.IsNull() {
// Skip attributes where both old and new values are null
// (we do this early here so that we'll do our value alignment
// based on the longest attribute name that has a change, rather
// than the longest attribute name in the full set.)
continue
}
attrNames = append(attrNames, name)
if len(name) > attrNameLen {
attrNameLen = len(name)
}
}
sort.Strings(attrNames)
if len(attrNames) > 0 {
blankBeforeBlocks = true
}
for _, name := range attrNames {
attrS := attrsS[name]
oldVal := ctyGetAttrMaybeNull(old, name)
newVal := ctyGetAttrMaybeNull(new, name)
result.bodyWritten = true
skipped := p.writeAttrDiff(name, attrS, oldVal, newVal, attrNameLen, indent, path)
if skipped {
result.skippedAttributes++
}
}
return blankBeforeBlocks
}
// getPlanActionAndShow returns the action value
// and a boolean for showJustNew. In this function we
// modify the old and new values to remove any possible marks
func getPlanActionAndShow(old cty.Value, new cty.Value) (plans.Action, bool) {
var action plans.Action
showJustNew := false
switch {
case old.IsNull():
action = plans.Create
showJustNew = true
case new.IsNull():
action = plans.Delete
case ctyEqualWithUnknown(old, new):
action = plans.NoOp
showJustNew = true
default:
action = plans.Update
}
return action, showJustNew
}
func (p *blockBodyDiffPrinter) writeAttrDiff(name string, attrS *configschema.Attribute, old, new cty.Value, nameLen, indent int, path cty.Path) bool {
path = append(path, cty.GetAttrStep{Name: name})
action, showJustNew := getPlanActionAndShow(old, new)
if action == plans.NoOp && !p.verbose && !identifyingAttribute(name, attrS) {
return true
}
if attrS.NestedType != nil {
p.writeNestedAttrDiff(name, attrS.NestedType, old, new, nameLen, indent, path, action, showJustNew)
return false
}
p.buf.WriteString("\n")
p.writeSensitivityWarning(old, new, indent, action, false)
p.buf.WriteString(strings.Repeat(" ", indent))
p.writeActionSymbol(action)
p.buf.WriteString(p.color.Color("[bold]"))
p.buf.WriteString(name)
p.buf.WriteString(p.color.Color("[reset]"))
p.buf.WriteString(strings.Repeat(" ", nameLen-len(name)))
p.buf.WriteString(" = ")
if attrS.Sensitive {
p.buf.WriteString("(sensitive value)")
if p.pathForcesNewResource(path) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
} else {
switch {
case showJustNew:
p.writeValue(new, action, indent+2)
if p.pathForcesNewResource(path) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
default:
// We show new even if it is null to emphasize the fact
// that it is being unset, since otherwise it is easy to
// misunderstand that the value is still set to the old value.
p.writeValueDiff(old, new, indent+2, path)
}
}
return false
}
// writeNestedAttrDiff is responsible for formatting Attributes with NestedTypes
// in the diff.
func (p *blockBodyDiffPrinter) writeNestedAttrDiff(
name string, objS *configschema.Object, old, new cty.Value,
nameLen, indent int, path cty.Path, action plans.Action, showJustNew bool) {
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent))
p.writeActionSymbol(action)
p.buf.WriteString(p.color.Color("[bold]"))
p.buf.WriteString(name)
p.buf.WriteString(p.color.Color("[reset]"))
p.buf.WriteString(strings.Repeat(" ", nameLen-len(name)))
result := &blockBodyDiffResult{}
switch objS.Nesting {
case configschema.NestingSingle:
p.buf.WriteString(" = {")
if action != plans.NoOp && (p.pathForcesNewResource(path) || p.pathForcesNewResource(path[:len(path)-1])) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
p.writeAttrsDiff(objS.Attributes, old, new, indent+4, path, result)
p.writeSkippedAttr(result.skippedAttributes, indent+6)
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString("}")
case configschema.NestingList:
p.buf.WriteString(" = [")
if action != plans.NoOp && (p.pathForcesNewResource(path) || p.pathForcesNewResource(path[:len(path)-1])) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
p.buf.WriteString("\n")
oldItems := ctyCollectionValues(old)
newItems := ctyCollectionValues(new)
// Here we intentionally preserve the index-based correspondance
// between old and new, rather than trying to detect insertions
// and removals in the list, because this more accurately reflects
// how Terraform Core and providers will understand the change,
// particularly when the nested block contains computed attributes
// that will themselves maintain correspondance by index.
// commonLen is number of elements that exist in both lists, which
// will be presented as updates (~). Any additional items in one
// of the lists will be presented as either creates (+) or deletes (-)
// depending on which list they belong to. maxLen is the number of
// elements in that longer list.
var commonLen int
var maxLen int
// unchanged is the number of unchanged elements
var unchanged int
switch {
case len(oldItems) < len(newItems):
commonLen = len(oldItems)
maxLen = len(newItems)
default:
commonLen = len(newItems)
maxLen = len(oldItems)
}
for i := 0; i < maxLen; i++ {
path := append(path, cty.IndexStep{Key: cty.NumberIntVal(int64(i))})
var action plans.Action
var oldItem, newItem cty.Value
switch {
case i < commonLen:
oldItem = oldItems[i]
newItem = newItems[i]
if oldItem.RawEquals(newItem) {
action = plans.NoOp
unchanged++
} else {
action = plans.Update
}
case i < len(oldItems):
oldItem = oldItems[i]
newItem = cty.NullVal(oldItem.Type())
action = plans.Delete
case i < len(newItems):
newItem = newItems[i]
oldItem = cty.NullVal(newItem.Type())
action = plans.Create
default:
action = plans.NoOp
}
if action != plans.NoOp {
p.buf.WriteString(strings.Repeat(" ", indent+4))
p.writeActionSymbol(action)
p.buf.WriteString("{")
result := &blockBodyDiffResult{}
p.writeAttrsDiff(objS.Attributes, oldItem, newItem, indent+8, path, result)
if action == plans.Update {
p.writeSkippedAttr(result.skippedAttributes, indent+10)
}
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+6))
p.buf.WriteString("},\n")
}
}
p.writeSkippedElems(unchanged, indent+6)
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString("]")
if !new.IsKnown() {
p.buf.WriteString(" -> (known after apply)")
}
case configschema.NestingSet:
oldItems := ctyCollectionValues(old)
newItems := ctyCollectionValues(new)
var all cty.Value
if len(oldItems)+len(newItems) > 0 {
allItems := make([]cty.Value, 0, len(oldItems)+len(newItems))
allItems = append(allItems, oldItems...)
allItems = append(allItems, newItems...)
all = cty.SetVal(allItems)
} else {
all = cty.SetValEmpty(old.Type().ElementType())
}
p.buf.WriteString(" = [")
var unchanged int
for it := all.ElementIterator(); it.Next(); {
_, val := it.Element()
var action plans.Action
var oldValue, newValue cty.Value
switch {
case !val.IsKnown():
action = plans.Update
newValue = val
case !new.IsKnown():
action = plans.Delete
// the value must have come from the old set
oldValue = val
// Mark the new val as null, but the entire set will be
// displayed as "(unknown after apply)"
newValue = cty.NullVal(val.Type())
case old.IsNull() || !old.HasElement(val).True():
action = plans.Create
oldValue = cty.NullVal(val.Type())
newValue = val
case new.IsNull() || !new.HasElement(val).True():
action = plans.Delete
oldValue = val
newValue = cty.NullVal(val.Type())
default:
action = plans.NoOp
oldValue = val
newValue = val
}
if action == plans.NoOp {
unchanged++
continue
}
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+4))
p.writeActionSymbol(action)
p.buf.WriteString("{")
if p.pathForcesNewResource(path) || p.pathForcesNewResource(path[:len(path)-1]) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
path := append(path, cty.IndexStep{Key: val})
p.writeAttrsDiff(objS.Attributes, oldValue, newValue, indent+8, path, result)
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+6))
p.buf.WriteString("},")
}
p.buf.WriteString("\n")
p.writeSkippedElems(unchanged, indent+6)
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString("]")
if !new.IsKnown() {
p.buf.WriteString(" -> (known after apply)")
}
case configschema.NestingMap:
// For the sake of handling nested blocks, we'll treat a null map
// the same as an empty map since the config language doesn't
// distinguish these anyway.
old = ctyNullBlockMapAsEmpty(old)
new = ctyNullBlockMapAsEmpty(new)
oldItems := old.AsValueMap()
newItems := map[string]cty.Value{}
if new.IsKnown() {
newItems = new.AsValueMap()
}
allKeys := make(map[string]bool)
for k := range oldItems {
allKeys[k] = true
}
for k := range newItems {
allKeys[k] = true
}
allKeysOrder := make([]string, 0, len(allKeys))
for k := range allKeys {
allKeysOrder = append(allKeysOrder, k)
}
sort.Strings(allKeysOrder)
p.buf.WriteString(" = {\n")
// unchanged tracks the number of unchanged elements
unchanged := 0
for _, k := range allKeysOrder {
var action plans.Action
oldValue := oldItems[k]
newValue := newItems[k]
switch {
case oldValue == cty.NilVal:
oldValue = cty.NullVal(newValue.Type())
action = plans.Create
case newValue == cty.NilVal:
newValue = cty.NullVal(oldValue.Type())
action = plans.Delete
case !newValue.RawEquals(oldValue):
action = plans.Update
default:
action = plans.NoOp
unchanged++
}
if action != plans.NoOp {
p.buf.WriteString(strings.Repeat(" ", indent+4))
p.writeActionSymbol(action)
fmt.Fprintf(p.buf, "%q = {", k)
if p.pathForcesNewResource(path) || p.pathForcesNewResource(path[:len(path)-1]) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
path := append(path, cty.IndexStep{Key: cty.StringVal(k)})
p.writeAttrsDiff(objS.Attributes, oldValue, newValue, indent+8, path, result)
p.writeSkippedAttr(result.skippedAttributes, indent+10)
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+6))
p.buf.WriteString("},\n")
}
}
p.writeSkippedElems(unchanged, indent+6)
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString("}")
if !new.IsKnown() {
p.buf.WriteString(" -> (known after apply)")
}
}
}
func (p *blockBodyDiffPrinter) writeNestedBlockDiffs(name string, blockS *configschema.NestedBlock, old, new cty.Value, blankBefore bool, indent int, path cty.Path) int {
skippedBlocks := 0
path = append(path, cty.GetAttrStep{Name: name})
if old.IsNull() && new.IsNull() {
// Nothing to do if both old and new is null
return skippedBlocks
}
// If either the old or the new value is marked,
// Display a special diff because it is irrelevant
// to list all obfuscated attributes as (sensitive)
if old.HasMark(marks.Sensitive) || new.HasMark(marks.Sensitive) {
p.writeSensitiveNestedBlockDiff(name, old, new, indent, blankBefore, path)
return 0
}
// Where old/new are collections representing a nesting mode other than
// NestingSingle, we assume the collection value can never be unknown
// since we always produce the container for the nested objects, even if
// the objects within are computed.
switch blockS.Nesting {
case configschema.NestingSingle, configschema.NestingGroup:
var action plans.Action
eqV := new.Equals(old)
switch {
case old.IsNull():
action = plans.Create
case new.IsNull():
action = plans.Delete
case !new.IsWhollyKnown() || !old.IsWhollyKnown():
// "old" should actually always be known due to our contract
// that old values must never be unknown, but we'll allow it
// anyway to be robust.
action = plans.Update
case !eqV.IsKnown() || !eqV.True():
action = plans.Update
}
if blankBefore {
p.buf.WriteRune('\n')
}
skipped := p.writeNestedBlockDiff(name, nil, &blockS.Block, action, old, new, indent, path)
if skipped {
return 1
}
case configschema.NestingList:
// For the sake of handling nested blocks, we'll treat a null list
// the same as an empty list since the config language doesn't
// distinguish these anyway.
old = ctyNullBlockListAsEmpty(old)
new = ctyNullBlockListAsEmpty(new)
oldItems := ctyCollectionValues(old)
newItems := ctyCollectionValues(new)
// Here we intentionally preserve the index-based correspondance
// between old and new, rather than trying to detect insertions
// and removals in the list, because this more accurately reflects
// how Terraform Core and providers will understand the change,
// particularly when the nested block contains computed attributes
// that will themselves maintain correspondance by index.
// commonLen is number of elements that exist in both lists, which
// will be presented as updates (~). Any additional items in one
// of the lists will be presented as either creates (+) or deletes (-)
// depending on which list they belong to.
var commonLen int
switch {
case len(oldItems) < len(newItems):
commonLen = len(oldItems)
default:
commonLen = len(newItems)
}
if blankBefore && (len(oldItems) > 0 || len(newItems) > 0) {
p.buf.WriteRune('\n')
}
for i := 0; i < commonLen; i++ {
path := append(path, cty.IndexStep{Key: cty.NumberIntVal(int64(i))})
oldItem := oldItems[i]
newItem := newItems[i]
action := plans.Update
if oldItem.RawEquals(newItem) {
action = plans.NoOp
}
skipped := p.writeNestedBlockDiff(name, nil, &blockS.Block, action, oldItem, newItem, indent, path)
if skipped {
skippedBlocks++
}
}
for i := commonLen; i < len(oldItems); i++ {
path := append(path, cty.IndexStep{Key: cty.NumberIntVal(int64(i))})
oldItem := oldItems[i]
newItem := cty.NullVal(oldItem.Type())
skipped := p.writeNestedBlockDiff(name, nil, &blockS.Block, plans.Delete, oldItem, newItem, indent, path)
if skipped {
skippedBlocks++
}
}
for i := commonLen; i < len(newItems); i++ {
path := append(path, cty.IndexStep{Key: cty.NumberIntVal(int64(i))})
newItem := newItems[i]
oldItem := cty.NullVal(newItem.Type())
skipped := p.writeNestedBlockDiff(name, nil, &blockS.Block, plans.Create, oldItem, newItem, indent, path)
if skipped {
skippedBlocks++
}
}
case configschema.NestingSet:
// For the sake of handling nested blocks, we'll treat a null set
// the same as an empty set since the config language doesn't
// distinguish these anyway.
old = ctyNullBlockSetAsEmpty(old)
new = ctyNullBlockSetAsEmpty(new)
oldItems := ctyCollectionValues(old)
newItems := ctyCollectionValues(new)
if (len(oldItems) + len(newItems)) == 0 {
// Nothing to do if both sets are empty
return 0
}
allItems := make([]cty.Value, 0, len(oldItems)+len(newItems))
allItems = append(allItems, oldItems...)
allItems = append(allItems, newItems...)
all := cty.SetVal(allItems)
if blankBefore {
p.buf.WriteRune('\n')
}
for it := all.ElementIterator(); it.Next(); {
_, val := it.Element()
var action plans.Action
var oldValue, newValue cty.Value
switch {
case !val.IsKnown():
action = plans.Update
newValue = val
case !old.HasElement(val).True():
action = plans.Create
oldValue = cty.NullVal(val.Type())
newValue = val
case !new.HasElement(val).True():
action = plans.Delete
oldValue = val
newValue = cty.NullVal(val.Type())
default:
action = plans.NoOp
oldValue = val
newValue = val
}
path := append(path, cty.IndexStep{Key: val})
skipped := p.writeNestedBlockDiff(name, nil, &blockS.Block, action, oldValue, newValue, indent, path)
if skipped {
skippedBlocks++
}
}
case configschema.NestingMap:
// For the sake of handling nested blocks, we'll treat a null map
// the same as an empty map since the config language doesn't
// distinguish these anyway.
old = ctyNullBlockMapAsEmpty(old)
new = ctyNullBlockMapAsEmpty(new)
oldItems := old.AsValueMap()
newItems := new.AsValueMap()
if (len(oldItems) + len(newItems)) == 0 {
// Nothing to do if both maps are empty
return 0
}
allKeys := make(map[string]bool)
for k := range oldItems {
allKeys[k] = true
}
for k := range newItems {
allKeys[k] = true
}
allKeysOrder := make([]string, 0, len(allKeys))
for k := range allKeys {
allKeysOrder = append(allKeysOrder, k)
}
sort.Strings(allKeysOrder)
if blankBefore {
p.buf.WriteRune('\n')
}
for _, k := range allKeysOrder {
var action plans.Action
oldValue := oldItems[k]
newValue := newItems[k]
switch {
case oldValue == cty.NilVal:
oldValue = cty.NullVal(newValue.Type())
action = plans.Create
case newValue == cty.NilVal:
newValue = cty.NullVal(oldValue.Type())
action = plans.Delete
case !newValue.RawEquals(oldValue):
action = plans.Update
default:
action = plans.NoOp
}
path := append(path, cty.IndexStep{Key: cty.StringVal(k)})
skipped := p.writeNestedBlockDiff(name, &k, &blockS.Block, action, oldValue, newValue, indent, path)
if skipped {
skippedBlocks++
}
}
}
return skippedBlocks
}
func (p *blockBodyDiffPrinter) writeSensitiveNestedBlockDiff(name string, old, new cty.Value, indent int, blankBefore bool, path cty.Path) {
var action plans.Action
switch {
case old.IsNull():
action = plans.Create
case new.IsNull():
action = plans.Delete
case !new.IsWhollyKnown() || !old.IsWhollyKnown():
// "old" should actually always be known due to our contract
// that old values must never be unknown, but we'll allow it
// anyway to be robust.
action = plans.Update
case !ctyEqualValueAndMarks(old, new):
action = plans.Update
}
if blankBefore {
p.buf.WriteRune('\n')
}
// New line before warning printing
p.buf.WriteRune('\n')
p.writeSensitivityWarning(old, new, indent, action, true)
p.buf.WriteString(strings.Repeat(" ", indent))
p.writeActionSymbol(action)
fmt.Fprintf(p.buf, "%s {", name)
if action != plans.NoOp && p.pathForcesNewResource(path) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
p.buf.WriteRune('\n')
p.buf.WriteString(strings.Repeat(" ", indent+4))
p.buf.WriteString("# At least one attribute in this block is (or was) sensitive,\n")
p.buf.WriteString(strings.Repeat(" ", indent+4))
p.buf.WriteString("# so its contents will not be displayed.")
p.buf.WriteRune('\n')
p.buf.WriteString(strings.Repeat(" ", indent+2))
p.buf.WriteString("}")
}
func (p *blockBodyDiffPrinter) writeNestedBlockDiff(name string, label *string, blockS *configschema.Block, action plans.Action, old, new cty.Value, indent int, path cty.Path) bool {
if action == plans.NoOp && !p.verbose {
return true
}
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent))
p.writeActionSymbol(action)
if label != nil {
fmt.Fprintf(p.buf, "%s %q {", name, *label)
} else {
fmt.Fprintf(p.buf, "%s {", name)
}
if action != plans.NoOp && (p.pathForcesNewResource(path) || p.pathForcesNewResource(path[:len(path)-1])) {
p.buf.WriteString(p.color.Color(forcesNewResourceCaption))
}
result := p.writeBlockBodyDiff(blockS, old, new, indent+4, path)
if result.bodyWritten {
p.buf.WriteString("\n")
p.buf.WriteString(strings.Repeat(" ", indent+2))
}
p.buf.WriteString("}")
return false