538 lines
13 KiB
Go
538 lines
13 KiB
Go
package terraform
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"regexp"
|
|
"sort"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/hashicorp/terraform/config"
|
|
"github.com/hashicorp/terraform/config/lang/ast"
|
|
"github.com/hashicorp/terraform/config/module"
|
|
)
|
|
|
|
const (
|
|
// VarEnvPrefix is the prefix of variables that are read from
|
|
// the environment to set variables here.
|
|
VarEnvPrefix = "TF_VAR_"
|
|
)
|
|
|
|
// Interpolater is the structure responsible for determining the values
|
|
// for interpolations such as `aws_instance.foo.bar`.
|
|
type Interpolater struct {
|
|
Operation walkOperation
|
|
Module *module.Tree
|
|
State *State
|
|
StateLock *sync.RWMutex
|
|
Variables map[string]string
|
|
}
|
|
|
|
// InterpolationScope is the current scope of execution. This is required
|
|
// since some variables which are interpolated are dependent on what we're
|
|
// operating on and where we are.
|
|
type InterpolationScope struct {
|
|
Path []string
|
|
Resource *Resource
|
|
}
|
|
|
|
// Values returns the values for all the variables in the given map.
|
|
func (i *Interpolater) Values(
|
|
scope *InterpolationScope,
|
|
vars map[string]config.InterpolatedVariable) (map[string]ast.Variable, error) {
|
|
result := make(map[string]ast.Variable, len(vars))
|
|
|
|
// Copy the default variables
|
|
if i.Module != nil && scope != nil {
|
|
mod := i.Module
|
|
if len(scope.Path) > 1 {
|
|
mod = i.Module.Child(scope.Path[1:])
|
|
}
|
|
for _, v := range mod.Config().Variables {
|
|
for k, val := range v.DefaultsMap() {
|
|
result[k] = ast.Variable{
|
|
Value: val,
|
|
Type: ast.TypeString,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for n, rawV := range vars {
|
|
var err error
|
|
switch v := rawV.(type) {
|
|
case *config.CountVariable:
|
|
err = i.valueCountVar(scope, n, v, result)
|
|
case *config.ModuleVariable:
|
|
err = i.valueModuleVar(scope, n, v, result)
|
|
case *config.PathVariable:
|
|
err = i.valuePathVar(scope, n, v, result)
|
|
case *config.ResourceVariable:
|
|
err = i.valueResourceVar(scope, n, v, result)
|
|
case *config.SelfVariable:
|
|
err = i.valueSelfVar(scope, n, v, result)
|
|
case *config.UserVariable:
|
|
err = i.valueUserVar(scope, n, v, result)
|
|
default:
|
|
err = fmt.Errorf("%s: unknown variable type: %T", n, rawV)
|
|
}
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return result, nil
|
|
}
|
|
|
|
func (i *Interpolater) valueCountVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.CountVariable,
|
|
result map[string]ast.Variable) error {
|
|
switch v.Type {
|
|
case config.CountValueIndex:
|
|
if scope.Resource == nil {
|
|
return fmt.Errorf("%s: count.index is only valid within resources", n)
|
|
}
|
|
result[n] = ast.Variable{
|
|
Value: scope.Resource.CountIndex,
|
|
Type: ast.TypeInt,
|
|
}
|
|
return nil
|
|
default:
|
|
return fmt.Errorf("%s: unknown count type: %#v", n, v.Type)
|
|
}
|
|
}
|
|
|
|
func (i *Interpolater) valueModuleVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.ModuleVariable,
|
|
result map[string]ast.Variable) error {
|
|
// If we're computing all dynamic fields, then module vars count
|
|
// and we mark it as computed.
|
|
if i.Operation == walkValidate {
|
|
result[n] = ast.Variable{
|
|
Value: config.UnknownVariableValue,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Build the path to the child module we want
|
|
path := make([]string, len(scope.Path), len(scope.Path)+1)
|
|
copy(path, scope.Path)
|
|
path = append(path, v.Name)
|
|
|
|
// Grab the lock so that if other interpolations are running or
|
|
// state is being modified, we'll be safe.
|
|
i.StateLock.RLock()
|
|
defer i.StateLock.RUnlock()
|
|
|
|
// Get the module where we're looking for the value
|
|
var value string
|
|
mod := i.State.ModuleByPath(path)
|
|
if mod == nil {
|
|
// If the module doesn't exist, then we can return an empty string.
|
|
// This happens usually only in Refresh() when we haven't populated
|
|
// a state. During validation, we semantically verify that all
|
|
// modules reference other modules, and graph ordering should
|
|
// ensure that the module is in the state, so if we reach this
|
|
// point otherwise it really is a panic.
|
|
value = config.UnknownVariableValue
|
|
} else {
|
|
// Get the value from the outputs
|
|
var ok bool
|
|
value, ok = mod.Outputs[v.Field]
|
|
if !ok {
|
|
// Same reasons as the comment above.
|
|
value = config.UnknownVariableValue
|
|
}
|
|
}
|
|
|
|
result[n] = ast.Variable{
|
|
Value: value,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (i *Interpolater) valuePathVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.PathVariable,
|
|
result map[string]ast.Variable) error {
|
|
switch v.Type {
|
|
case config.PathValueCwd:
|
|
wd, err := os.Getwd()
|
|
if err != nil {
|
|
return fmt.Errorf(
|
|
"Couldn't get cwd for var %s: %s",
|
|
v.FullKey(), err)
|
|
}
|
|
|
|
result[n] = ast.Variable{
|
|
Value: wd,
|
|
Type: ast.TypeString,
|
|
}
|
|
case config.PathValueModule:
|
|
if t := i.Module.Child(scope.Path[1:]); t != nil {
|
|
result[n] = ast.Variable{
|
|
Value: t.Config().Dir,
|
|
Type: ast.TypeString,
|
|
}
|
|
}
|
|
case config.PathValueRoot:
|
|
result[n] = ast.Variable{
|
|
Value: i.Module.Config().Dir,
|
|
Type: ast.TypeString,
|
|
}
|
|
default:
|
|
return fmt.Errorf("%s: unknown path type: %#v", n, v.Type)
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
func (i *Interpolater) valueResourceVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.ResourceVariable,
|
|
result map[string]ast.Variable) error {
|
|
// If we're computing all dynamic fields, then module vars count
|
|
// and we mark it as computed.
|
|
if i.Operation == walkValidate {
|
|
result[n] = ast.Variable{
|
|
Value: config.UnknownVariableValue,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var attr string
|
|
var err error
|
|
if v.Multi && v.Index == -1 {
|
|
attr, err = i.computeResourceMultiVariable(scope, v)
|
|
} else {
|
|
attr, err = i.computeResourceVariable(scope, v)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
result[n] = ast.Variable{
|
|
Value: attr,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (i *Interpolater) valueSelfVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.SelfVariable,
|
|
result map[string]ast.Variable) error {
|
|
rv, err := config.NewResourceVariable(fmt.Sprintf(
|
|
"%s.%s.%d.%s",
|
|
scope.Resource.Type,
|
|
scope.Resource.Name,
|
|
scope.Resource.CountIndex,
|
|
v.Field))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return i.valueResourceVar(scope, n, rv, result)
|
|
}
|
|
|
|
func (i *Interpolater) valueUserVar(
|
|
scope *InterpolationScope,
|
|
n string,
|
|
v *config.UserVariable,
|
|
result map[string]ast.Variable) error {
|
|
val, ok := i.Variables[v.Name]
|
|
if ok {
|
|
result[n] = ast.Variable{
|
|
Value: val,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
if _, ok := result[n]; !ok && i.Operation == walkValidate {
|
|
result[n] = ast.Variable{
|
|
Value: config.UnknownVariableValue,
|
|
Type: ast.TypeString,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Look up if we have any variables with this prefix because
|
|
// those are map overrides. Include those.
|
|
for k, val := range i.Variables {
|
|
if strings.HasPrefix(k, v.Name+".") {
|
|
result["var."+k] = ast.Variable{
|
|
Value: val,
|
|
Type: ast.TypeString,
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (i *Interpolater) computeResourceVariable(
|
|
scope *InterpolationScope,
|
|
v *config.ResourceVariable) (string, error) {
|
|
id := v.ResourceId()
|
|
if v.Multi {
|
|
id = fmt.Sprintf("%s.%d", id, v.Index)
|
|
}
|
|
|
|
i.StateLock.RLock()
|
|
defer i.StateLock.RUnlock()
|
|
|
|
// Get the information about this resource variable, and verify
|
|
// that it exists and such.
|
|
module, _, err := i.resourceVariableInfo(scope, v)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// If we have no module in the state yet or count, return empty
|
|
if module == nil || len(module.Resources) == 0 {
|
|
return "", nil
|
|
}
|
|
|
|
// Get the resource out from the state. We know the state exists
|
|
// at this point and if there is a state, we expect there to be a
|
|
// resource with the given name.
|
|
r, ok := module.Resources[id]
|
|
if !ok && v.Multi && v.Index == 0 {
|
|
r, ok = module.Resources[v.ResourceId()]
|
|
}
|
|
if !ok {
|
|
r = nil
|
|
}
|
|
if r == nil {
|
|
goto MISSING
|
|
}
|
|
|
|
if r.Primary == nil {
|
|
goto MISSING
|
|
}
|
|
|
|
if attr, ok := r.Primary.Attributes[v.Field]; ok {
|
|
return attr, nil
|
|
}
|
|
|
|
// computed list attribute
|
|
if _, ok := r.Primary.Attributes[v.Field+".#"]; ok {
|
|
return i.interpolateListAttribute(v.Field, r.Primary.Attributes)
|
|
}
|
|
|
|
// At apply time, we can't do the "maybe has it" check below
|
|
// that we need for plans since parent elements might be computed.
|
|
// Therefore, it is an error and we're missing the key.
|
|
//
|
|
// TODO: test by creating a state and configuration that is referencing
|
|
// a non-existent variable "foo.bar" where the state only has "foo"
|
|
// and verify plan works, but apply doesn't.
|
|
if i.Operation == walkApply {
|
|
goto MISSING
|
|
}
|
|
|
|
// We didn't find the exact field, so lets separate the dots
|
|
// and see if anything along the way is a computed set. i.e. if
|
|
// we have "foo.0.bar" as the field, check to see if "foo" is
|
|
// a computed list. If so, then the whole thing is computed.
|
|
if parts := strings.Split(v.Field, "."); len(parts) > 1 {
|
|
for i := 1; i < len(parts); i++ {
|
|
// Lists and sets make this
|
|
key := fmt.Sprintf("%s.#", strings.Join(parts[:i], "."))
|
|
if attr, ok := r.Primary.Attributes[key]; ok {
|
|
return attr, nil
|
|
}
|
|
|
|
// Maps make this
|
|
key = fmt.Sprintf("%s", strings.Join(parts[:i], "."))
|
|
if attr, ok := r.Primary.Attributes[key]; ok {
|
|
return attr, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
MISSING:
|
|
// Validation for missing interpolations should happen at a higher
|
|
// semantic level. If we reached this point and don't have variables,
|
|
// just return the computed value.
|
|
if scope == nil && scope.Resource == nil {
|
|
return config.UnknownVariableValue, nil
|
|
}
|
|
|
|
// If the operation is refresh, it isn't an error for a value to
|
|
// be unknown. Instead, we return that the value is computed so
|
|
// that the graph can continue to refresh other nodes. It doesn't
|
|
// matter because the config isn't interpolated anyways.
|
|
if i.Operation == walkRefresh || i.Operation == walkPlanDestroy {
|
|
return config.UnknownVariableValue, nil
|
|
}
|
|
|
|
return "", fmt.Errorf(
|
|
"Resource '%s' does not have attribute '%s' "+
|
|
"for variable '%s'",
|
|
id,
|
|
v.Field,
|
|
v.FullKey())
|
|
}
|
|
|
|
func (i *Interpolater) computeResourceMultiVariable(
|
|
scope *InterpolationScope,
|
|
v *config.ResourceVariable) (string, error) {
|
|
i.StateLock.RLock()
|
|
defer i.StateLock.RUnlock()
|
|
|
|
// Get the information about this resource variable, and verify
|
|
// that it exists and such.
|
|
module, cr, err := i.resourceVariableInfo(scope, v)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// Get the count so we know how many to iterate over
|
|
count, err := cr.Count()
|
|
if err != nil {
|
|
return "", fmt.Errorf(
|
|
"Error reading %s count: %s",
|
|
v.ResourceId(),
|
|
err)
|
|
}
|
|
|
|
// If we have no module in the state yet or count, return empty
|
|
if module == nil || len(module.Resources) == 0 || count == 0 {
|
|
return "", nil
|
|
}
|
|
|
|
var values []string
|
|
for j := 0; j < count; j++ {
|
|
id := fmt.Sprintf("%s.%d", v.ResourceId(), j)
|
|
|
|
// If we're dealing with only a single resource, then the
|
|
// ID doesn't have a trailing index.
|
|
if count == 1 {
|
|
id = v.ResourceId()
|
|
}
|
|
|
|
r, ok := module.Resources[id]
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
if r.Primary == nil {
|
|
continue
|
|
}
|
|
|
|
attr, ok := r.Primary.Attributes[v.Field]
|
|
if !ok {
|
|
// computed list attribute
|
|
_, ok := r.Primary.Attributes[v.Field+".#"]
|
|
if !ok {
|
|
continue
|
|
}
|
|
attr, err = i.interpolateListAttribute(v.Field, r.Primary.Attributes)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
|
|
if config.IsStringList(attr) {
|
|
for _, s := range config.StringList(attr).Slice() {
|
|
values = append(values, s)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// If any value is unknown, the whole thing is unknown
|
|
if attr == config.UnknownVariableValue {
|
|
return config.UnknownVariableValue, nil
|
|
}
|
|
|
|
values = append(values, attr)
|
|
}
|
|
|
|
if len(values) == 0 {
|
|
// If the operation is refresh, it isn't an error for a value to
|
|
// be unknown. Instead, we return that the value is computed so
|
|
// that the graph can continue to refresh other nodes. It doesn't
|
|
// matter because the config isn't interpolated anyways.
|
|
if i.Operation == walkRefresh || i.Operation == walkPlanDestroy {
|
|
return config.UnknownVariableValue, nil
|
|
}
|
|
|
|
return "", fmt.Errorf(
|
|
"Resource '%s' does not have attribute '%s' "+
|
|
"for variable '%s'",
|
|
v.ResourceId(),
|
|
v.Field,
|
|
v.FullKey())
|
|
}
|
|
|
|
return config.NewStringList(values).String(), nil
|
|
}
|
|
|
|
func (i *Interpolater) interpolateListAttribute(
|
|
resourceID string,
|
|
attributes map[string]string) (string, error) {
|
|
|
|
attr := attributes[resourceID+".#"]
|
|
log.Printf("[DEBUG] Interpolating computed list attribute %s (%s)",
|
|
resourceID, attr)
|
|
|
|
var members []string
|
|
numberedListMember := regexp.MustCompile("^" + resourceID + "\\.[0-9]+$")
|
|
for id, value := range attributes {
|
|
if numberedListMember.MatchString(id) {
|
|
members = append(members, value)
|
|
}
|
|
}
|
|
|
|
sort.Strings(members)
|
|
return config.NewStringList(members).String(), nil
|
|
}
|
|
|
|
func (i *Interpolater) resourceVariableInfo(
|
|
scope *InterpolationScope,
|
|
v *config.ResourceVariable) (*ModuleState, *config.Resource, error) {
|
|
// Get the module tree that contains our current path. This is
|
|
// either the current module (path is empty) or a child.
|
|
modTree := i.Module
|
|
if len(scope.Path) > 1 {
|
|
modTree = i.Module.Child(scope.Path[1:])
|
|
}
|
|
|
|
// Get the resource from the configuration so we can verify
|
|
// that the resource is in the configuration and so we can access
|
|
// the configuration if we need to.
|
|
var cr *config.Resource
|
|
for _, r := range modTree.Config().Resources {
|
|
if r.Id() == v.ResourceId() {
|
|
cr = r
|
|
break
|
|
}
|
|
}
|
|
if cr == nil {
|
|
return nil, nil, fmt.Errorf(
|
|
"Resource '%s' not found for variable '%s'",
|
|
v.ResourceId(),
|
|
v.FullKey())
|
|
}
|
|
|
|
// Get the relevant module
|
|
module := i.State.ModuleByPath(scope.Path)
|
|
return module, cr, nil
|
|
}
|