terraform/command/format_plan.go

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package command
import (
"bytes"
"fmt"
"sort"
"strings"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/colorstring"
)
// FormatPlanOpts are the options for formatting a plan.
type FormatPlanOpts struct {
// Plan is the plan to format. This is required.
Plan *terraform.Plan
// Color is the colorizer. This is optional.
Color *colorstring.Colorize
// ModuleDepth is the depth of the modules to expand. By default this
// is zero which will not expand modules at all.
ModuleDepth int
}
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// FormatPlan takes a plan and returns a
func FormatPlan(opts *FormatPlanOpts) string {
p := opts.Plan
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if p.Diff == nil || p.Diff.Empty() {
return "This plan does nothing."
}
if opts.Color == nil {
opts.Color = &colorstring.Colorize{
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Colors: colorstring.DefaultColors,
Reset: false,
}
}
buf := new(bytes.Buffer)
for _, m := range p.Diff.Modules {
if len(m.Path)-1 <= opts.ModuleDepth || opts.ModuleDepth == -1 {
formatPlanModuleExpand(buf, m, opts)
} else {
formatPlanModuleSingle(buf, m, opts)
}
}
return strings.TrimSpace(buf.String())
}
// formatPlanModuleExpand will output the given module and all of its
// resources.
func formatPlanModuleExpand(
buf *bytes.Buffer, m *terraform.ModuleDiff, opts *FormatPlanOpts) {
// Ignore empty diffs
if m.Empty() {
return
}
var moduleName string
if !m.IsRoot() {
moduleName = fmt.Sprintf("module.%s", strings.Join(m.Path[1:], "."))
}
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// We want to output the resources in sorted order to make things
// easier to scan through, so get all the resource names and sort them.
names := make([]string, 0, len(m.Resources))
for name, _ := range m.Resources {
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names = append(names, name)
}
sort.Strings(names)
// Go through each sorted name and start building the output
for _, name := range names {
rdiff := m.Resources[name]
if rdiff.Empty() {
continue
}
dataSource := strings.HasPrefix(name, "data.")
if moduleName != "" {
name = moduleName + "." + name
}
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// Determine the color for the text (green for adding, yellow
// for change, red for delete), and symbol, and output the
// resource header.
color := "yellow"
symbol := "~"
oldValues := true
switch rdiff.ChangeType() {
case terraform.DiffDestroyCreate:
color = "green"
symbol = "-/+"
case terraform.DiffCreate:
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color = "green"
symbol = "+"
oldValues = false
// If we're "creating" a data resource then we'll present it
// to the user as a "read" operation, so it's clear that this
// operation won't change anything outside of the Terraform state.
// Unfortunately by the time we get here we only have the name
// to work with, so we need to cheat and exploit knowledge of the
// naming scheme for data resources.
if dataSource {
symbol = "<="
color = "cyan"
}
case terraform.DiffDestroy:
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color = "red"
symbol = "-"
}
var extraAttr []string
if rdiff.DestroyTainted {
extraAttr = append(extraAttr, "tainted")
}
if rdiff.DestroyDeposed {
extraAttr = append(extraAttr, "deposed")
}
var extraStr string
if len(extraAttr) > 0 {
extraStr = fmt.Sprintf(" (%s)", strings.Join(extraAttr, ", "))
}
buf.WriteString(opts.Color.Color(fmt.Sprintf(
"[%s]%s %s%s\n",
color, symbol, name, extraStr)))
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// Get all the attributes that are changing, and sort them. Also
// determine the longest key so that we can align them all.
keyLen := 0
keys := make([]string, 0, len(rdiff.Attributes))
for key, _ := range rdiff.Attributes {
// Skip the ID since we do that specially
if key == "id" {
continue
}
keys = append(keys, key)
if len(key) > keyLen {
keyLen = len(key)
}
}
sort.Strings(keys)
// Go through and output each attribute
for _, attrK := range keys {
attrDiff := rdiff.Attributes[attrK]
v := attrDiff.New
if v == "" && attrDiff.NewComputed {
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v = "<computed>"
}
if attrDiff.Sensitive {
v = "<sensitive>"
}
updateMsg := ""
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if attrDiff.RequiresNew && rdiff.Destroy {
updateMsg = opts.Color.Color(" [red](forces new resource)")
} else if attrDiff.Sensitive && oldValues {
updateMsg = opts.Color.Color(" [yellow](attribute changed)")
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}
if oldValues {
var u string
if attrDiff.Sensitive {
u = "<sensitive>"
} else {
u = attrDiff.Old
}
buf.WriteString(fmt.Sprintf(
" %s:%s %#v => %#v%s\n",
attrK,
strings.Repeat(" ", keyLen-len(attrK)),
u,
v,
updateMsg))
} else {
buf.WriteString(fmt.Sprintf(
" %s:%s %#v%s\n",
attrK,
strings.Repeat(" ", keyLen-len(attrK)),
v,
updateMsg))
}
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}
// Write the reset color so we don't overload the user's terminal
buf.WriteString(opts.Color.Color("[reset]\n"))
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}
}
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// formatPlanModuleSingle will output the given module and all of its
// resources.
func formatPlanModuleSingle(
buf *bytes.Buffer, m *terraform.ModuleDiff, opts *FormatPlanOpts) {
// Ignore empty diffs
if m.Empty() {
return
}
moduleName := fmt.Sprintf("module.%s", strings.Join(m.Path[1:], "."))
// Determine the color for the text (green for adding, yellow
// for change, red for delete), and symbol, and output the
// resource header.
color := "yellow"
symbol := "~"
switch m.ChangeType() {
case terraform.DiffCreate:
color = "green"
symbol = "+"
case terraform.DiffDestroy:
color = "red"
symbol = "-"
}
buf.WriteString(opts.Color.Color(fmt.Sprintf(
"[%s]%s %s\n",
color, symbol, moduleName)))
buf.WriteString(fmt.Sprintf(
" %d resource(s)",
len(m.Resources)))
buf.WriteString(opts.Color.Color("[reset]\n"))
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}