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)
// In Terraform's internal dotted representation of list-like attributes, the
// ".#" count field is marked as unknown to indicate "this whole list is
// unknown". We must honor that meaning here so computed references can be
// treated properly during the plan phase.
if attr == config.UnknownVariableValue {
return attr, nil
}
// Otherwise we gather the values from the list-like attribute and return
// them.
var members []string
numberedListMember := regexp.MustCompile("^" + resourceID + "\\.[0-9]+$")
for id, value := range attributes {
if numberedListMember.MatchString(id) {
members = append(members, value)
}
}
sort.Strings(members)
return config.NewStringList(members).String(), nil
}
func (i *Interpolater) interpolateListAttribute(
resourceID string,
attributes map[string]string) (string, error) {
attr := attributes[resourceID+".#"]
log.Printf("[DEBUG] Interpolating computed list attribute %s (%s)",
resourceID, attr)
var members []string
numberedListMember := regexp.MustCompile("^" + resourceID + "\\.[0-9]+$")
for id, value := range attributes {
if numberedListMember.MatchString(id) {
members = append(members, value)
}
}
sort.Strings(members)
return config.NewStringList(members).String(), nil
}
func TestInterpolator_resourceMultiAttributesWithResourceCount(t *testing.T) {
i := getInterpolaterFixture(t)
scope := &InterpolationScope{
Path: rootModulePath,
}
name_servers := []string{
"ns-1334.awsdns-38.org",
"ns-1680.awsdns-18.co.uk",
"ns-498.awsdns-62.com",
"ns-601.awsdns-11.net",
"ns-000.awsdns-38.org",
"ns-444.awsdns-18.co.uk",
"ns-666.awsdns-11.net",
"ns-999.awsdns-62.com",
}
// More than 1 element
expectedNameServers := config.NewStringList(name_servers[0:4]).String()
testInterpolate(t, i, scope, "aws_route53_zone.terra.0.name_servers", ast.Variable{
Value: expectedNameServers,
Type: ast.TypeString,
})
// More than 1 element in both
expectedNameServers = config.NewStringList(name_servers).String()
testInterpolate(t, i, scope, "aws_route53_zone.terra.*.name_servers", ast.Variable{
Value: expectedNameServers,
Type: ast.TypeString,
})
// Exactly 1 element
testInterpolate(t, i, scope, "aws_route53_zone.terra.0.listeners", ast.Variable{
Value: config.NewStringList([]string{"red"}).String(),
Type: ast.TypeString,
})
// Exactly 1 element in both
testInterpolate(t, i, scope, "aws_route53_zone.terra.*.listeners", ast.Variable{
Value: config.NewStringList([]string{"red", "blue"}).String(),
Type: ast.TypeString,
})
// Zero elements
testInterpolate(t, i, scope, "aws_route53_zone.terra.0.nothing", ast.Variable{
Value: config.NewStringList([]string{}).String(),
Type: ast.TypeString,
})
// Zero + zero elements
testInterpolate(t, i, scope, "aws_route53_zone.terra.*.nothing", ast.Variable{
Value: config.NewStringList([]string{"", ""}).String(),
Type: ast.TypeString,
})
// Zero + 1 element
testInterpolate(t, i, scope, "aws_route53_zone.terra.*.special", ast.Variable{
Value: config.NewStringList([]string{"extra"}).String(),
Type: ast.TypeString,
})
// Maps still need to work
testInterpolate(t, i, scope, "aws_route53_zone.terra.0.tags.Name", ast.Variable{
Value: "reindeer",
Type: ast.TypeString,
})
// Maps still need to work in both
testInterpolate(t, i, scope, "aws_route53_zone.terra.*.tags.Name", ast.Variable{
Value: config.NewStringList([]string{"reindeer", "white-hart"}).String(),
Type: ast.TypeString,
})
}
func TestInterpolator_resourceMultiAttributes(t *testing.T) {
lock := new(sync.RWMutex)
state := &State{
Modules: []*ModuleState{
&ModuleState{
Path: rootModulePath,
Resources: map[string]*ResourceState{
"aws_route53_zone.yada": &ResourceState{
Type: "aws_route53_zone",
Dependencies: []string{},
Primary: &InstanceState{
ID: "AAABBBCCCDDDEEE",
Attributes: map[string]string{
"name_servers.#": "4",
"name_servers.0": "ns-1334.awsdns-38.org",
"name_servers.1": "ns-1680.awsdns-18.co.uk",
"name_servers.2": "ns-498.awsdns-62.com",
"name_servers.3": "ns-601.awsdns-11.net",
"listeners.#": "1",
"listeners.0": "red",
"tags.#": "1",
"tags.Name": "reindeer",
"nothing.#": "0",
},
},
},
},
},
},
}
i := &Interpolater{
Module: testModule(t, "interpolate-multi-vars"),
StateLock: lock,
State: state,
}
scope := &InterpolationScope{
Path: rootModulePath,
}
name_servers := []string{
"ns-1334.awsdns-38.org",
"ns-1680.awsdns-18.co.uk",
"ns-498.awsdns-62.com",
"ns-601.awsdns-11.net",
}
expectedNameServers := config.NewStringList(name_servers).String()
// More than 1 element
testInterpolate(t, i, scope, "aws_route53_zone.yada.name_servers", ast.Variable{
Value: expectedNameServers,
Type: ast.TypeString,
})
// Exactly 1 element
testInterpolate(t, i, scope, "aws_route53_zone.yada.listeners", ast.Variable{
Value: config.NewStringList([]string{"red"}).String(),
Type: ast.TypeString,
})
// Zero elements
testInterpolate(t, i, scope, "aws_route53_zone.yada.nothing", ast.Variable{
Value: config.NewStringList([]string{}).String(),
Type: ast.TypeString,
})
// Maps still need to work
testInterpolate(t, i, scope, "aws_route53_zone.yada.tags.Name", ast.Variable{
Value: "reindeer",
Type: ast.TypeString,
})
}
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.
//
// For a Destroy, we're also fine with computed values, since our goal is
// only to get destroy nodes for existing resources.
//
// For an input walk, computed values are okay to return because we're only
// looking for missing variables to prompt the user for.
if i.Operation == walkRefresh || i.Operation == walkPlanDestroy || i.Operation == walkDestroy || i.Operation == walkInput {
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) 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 i := 0; i < count; i++ {
id := fmt.Sprintf("%s.%d", v.ResourceId(), i)
// 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 {
continue
}
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 {
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
}