terraform/config/loader_hcl.go

1246 lines
30 KiB
Go

package config
import (
"fmt"
"io/ioutil"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/mitchellh/mapstructure"
)
// hclConfigurable is an implementation of configurable that knows
// how to turn HCL configuration into a *Config object.
type hclConfigurable struct {
File string
Root *ast.File
}
var ReservedDataSourceFields = []string{
"connection",
"count",
"depends_on",
"lifecycle",
"provider",
"provisioner",
}
var ReservedResourceFields = []string{
"connection",
"count",
"depends_on",
"id",
"lifecycle",
"provider",
"provisioner",
}
var ReservedProviderFields = []string{
"alias",
"version",
}
func (t *hclConfigurable) Config() (*Config, error) {
validKeys := map[string]struct{}{
"atlas": struct{}{},
"data": struct{}{},
"locals": struct{}{},
"module": struct{}{},
"output": struct{}{},
"provider": struct{}{},
"resource": struct{}{},
"terraform": struct{}{},
"variable": struct{}{},
}
// Top-level item should be the object list
list, ok := t.Root.Node.(*ast.ObjectList)
if !ok {
return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
}
// Start building up the actual configuration.
config := new(Config)
// Terraform config
if o := list.Filter("terraform"); len(o.Items) > 0 {
var err error
config.Terraform, err = loadTerraformHcl(o)
if err != nil {
return nil, err
}
}
// Build the variables
if vars := list.Filter("variable"); len(vars.Items) > 0 {
var err error
config.Variables, err = loadVariablesHcl(vars)
if err != nil {
return nil, err
}
}
// Build local values
if locals := list.Filter("locals"); len(locals.Items) > 0 {
var err error
config.Locals, err = loadLocalsHcl(locals)
if err != nil {
return nil, err
}
}
// Get Atlas configuration
if atlas := list.Filter("atlas"); len(atlas.Items) > 0 {
var err error
config.Atlas, err = loadAtlasHcl(atlas)
if err != nil {
return nil, err
}
}
// Build the modules
if modules := list.Filter("module"); len(modules.Items) > 0 {
var err error
config.Modules, err = loadModulesHcl(modules)
if err != nil {
return nil, err
}
}
// Build the provider configs
if providers := list.Filter("provider"); len(providers.Items) > 0 {
var err error
config.ProviderConfigs, err = loadProvidersHcl(providers)
if err != nil {
return nil, err
}
}
// Build the resources
{
var err error
managedResourceConfigs := list.Filter("resource")
dataResourceConfigs := list.Filter("data")
config.Resources = make(
[]*Resource, 0,
len(managedResourceConfigs.Items)+len(dataResourceConfigs.Items),
)
managedResources, err := loadManagedResourcesHcl(managedResourceConfigs)
if err != nil {
return nil, err
}
dataResources, err := loadDataResourcesHcl(dataResourceConfigs)
if err != nil {
return nil, err
}
config.Resources = append(config.Resources, dataResources...)
config.Resources = append(config.Resources, managedResources...)
}
// Build the outputs
if outputs := list.Filter("output"); len(outputs.Items) > 0 {
var err error
config.Outputs, err = loadOutputsHcl(outputs)
if err != nil {
return nil, err
}
}
// Check for invalid keys
for _, item := range list.Items {
if len(item.Keys) == 0 {
// Not sure how this would happen, but let's avoid a panic
continue
}
k := item.Keys[0].Token.Value().(string)
if _, ok := validKeys[k]; ok {
continue
}
config.unknownKeys = append(config.unknownKeys, k)
}
return config, nil
}
// loadFileHcl is a fileLoaderFunc that knows how to read HCL
// files and turn them into hclConfigurables.
func loadFileHcl(root string) (configurable, []string, error) {
// Read the HCL file and prepare for parsing
d, err := ioutil.ReadFile(root)
if err != nil {
return nil, nil, fmt.Errorf(
"Error reading %s: %s", root, err)
}
// Parse it
hclRoot, err := hcl.Parse(string(d))
if err != nil {
return nil, nil, fmt.Errorf(
"Error parsing %s: %s", root, err)
}
// Start building the result
result := &hclConfigurable{
File: root,
Root: hclRoot,
}
// Dive in, find the imports. This is disabled for now since
// imports were removed prior to Terraform 0.1. The code is
// remaining here commented for historical purposes.
/*
imports := obj.Get("import")
if imports == nil {
result.Object.Ref()
return result, nil, nil
}
if imports.Type() != libucl.ObjectTypeString {
imports.Close()
return nil, nil, fmt.Errorf(
"Error in %s: all 'import' declarations should be in the format\n"+
"`import \"foo\"` (Got type %s)",
root,
imports.Type())
}
// Gather all the import paths
importPaths := make([]string, 0, imports.Len())
iter := imports.Iterate(false)
for imp := iter.Next(); imp != nil; imp = iter.Next() {
path := imp.ToString()
if !filepath.IsAbs(path) {
// Relative paths are relative to the Terraform file itself
dir := filepath.Dir(root)
path = filepath.Join(dir, path)
}
importPaths = append(importPaths, path)
imp.Close()
}
iter.Close()
imports.Close()
result.Object.Ref()
*/
return result, nil, nil
}
// Given a handle to a HCL object, this transforms it into the Terraform config
func loadTerraformHcl(list *ast.ObjectList) (*Terraform, error) {
if len(list.Items) > 1 {
return nil, fmt.Errorf("only one 'terraform' block allowed per module")
}
// Get our one item
item := list.Items[0]
// This block should have an empty top level ObjectItem. If there are keys
// here, it's likely because we have a flattened JSON object, and we can
// lift this into a nested ObjectList to decode properly.
if len(item.Keys) > 0 {
item = &ast.ObjectItem{
Val: &ast.ObjectType{
List: &ast.ObjectList{
Items: []*ast.ObjectItem{item},
},
},
}
}
// We need the item value as an ObjectList
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("terraform block: should be an object")
}
// NOTE: We purposely don't validate unknown HCL keys here so that
// we can potentially read _future_ Terraform version config (to
// still be able to validate the required version).
//
// We should still keep track of unknown keys to validate later, but
// HCL doesn't currently support that.
var config Terraform
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading terraform config: %s",
err)
}
// If we have provisioners, then parse those out
if os := listVal.Filter("backend"); len(os.Items) > 0 {
var err error
config.Backend, err = loadTerraformBackendHcl(os)
if err != nil {
return nil, fmt.Errorf(
"Error reading backend config for terraform block: %s",
err)
}
}
return &config, nil
}
// Loads the Backend configuration from an object list.
func loadTerraformBackendHcl(list *ast.ObjectList) (*Backend, error) {
if len(list.Items) > 1 {
return nil, fmt.Errorf("only one 'backend' block allowed")
}
// Get our one item
item := list.Items[0]
// Verify the keys
if len(item.Keys) != 1 {
return nil, fmt.Errorf(
"position %s: 'backend' must be followed by exactly one string: a type",
item.Pos())
}
typ := item.Keys[0].Token.Value().(string)
// Decode the raw config
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading backend config: %s",
err)
}
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading backend config: %s",
err)
}
b := &Backend{
Type: typ,
RawConfig: rawConfig,
}
b.Hash = b.Rehash()
return b, nil
}
// Given a handle to a HCL object, this transforms it into the Atlas
// configuration.
func loadAtlasHcl(list *ast.ObjectList) (*AtlasConfig, error) {
if len(list.Items) > 1 {
return nil, fmt.Errorf("only one 'atlas' block allowed")
}
// Get our one item
item := list.Items[0]
var config AtlasConfig
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading atlas config: %s",
err)
}
return &config, nil
}
// Given a handle to a HCL object, this recurses into the structure
// and pulls out a list of modules.
//
// The resulting modules may not be unique, but each module
// represents exactly one module definition in the HCL configuration.
// We leave it up to another pass to merge them together.
func loadModulesHcl(list *ast.ObjectList) ([]*Module, error) {
if err := assertAllBlocksHaveNames("module", list); err != nil {
return nil, err
}
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Where all the results will go
var result []*Module
// Now go over all the types and their children in order to get
// all of the actual resources.
for _, item := range list.Items {
k := item.Keys[0].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("module '%s': should be an object", k)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading config for %s: %s",
k,
err)
}
// Remove the fields we handle specially
delete(config, "source")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for %s: %s",
k,
err)
}
// If we have a count, then figure it out
var source string
if o := listVal.Filter("source"); len(o.Items) > 0 {
err = hcl.DecodeObject(&source, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error parsing source for %s: %s",
k,
err)
}
}
result = append(result, &Module{
Name: k,
Source: source,
RawConfig: rawConfig,
})
}
return result, nil
}
// loadLocalsHcl recurses into the given HCL object turns it into
// a list of locals.
func loadLocalsHcl(list *ast.ObjectList) ([]*Local, error) {
result := make([]*Local, 0, len(list.Items))
for _, block := range list.Items {
if len(block.Keys) > 0 {
return nil, fmt.Errorf(
"locals block at %s should not have label %q",
block.Pos(), block.Keys[0].Token.Value(),
)
}
blockObj, ok := block.Val.(*ast.ObjectType)
if !ok {
return nil, fmt.Errorf("locals value at %s should be a block", block.Val.Pos())
}
// blockObj now contains directly our local decls
for _, item := range blockObj.List.Items {
if len(item.Keys) != 1 {
return nil, fmt.Errorf("local declaration at %s may not be a block", item.Val.Pos())
}
// By the time we get here there can only be one item left, but
// we'll decode into a map anyway because it's a convenient way
// to extract both the key and the value robustly.
kv := map[string]interface{}{}
hcl.DecodeObject(&kv, item)
for k, v := range kv {
rawConfig, err := NewRawConfig(map[string]interface{}{
"value": v,
})
if err != nil {
return nil, fmt.Errorf(
"error parsing local value %q at %s: %s",
k, item.Val.Pos(), err,
)
}
result = append(result, &Local{
Name: k,
RawConfig: rawConfig,
})
}
}
}
return result, nil
}
// LoadOutputsHcl recurses into the given HCL object and turns
// it into a mapping of outputs.
func loadOutputsHcl(list *ast.ObjectList) ([]*Output, error) {
if err := assertAllBlocksHaveNames("output", list); err != nil {
return nil, err
}
list = list.Children()
// Go through each object and turn it into an actual result.
result := make([]*Output, 0, len(list.Items))
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("output '%s': should be an object", n)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, err
}
// Delete special keys
delete(config, "depends_on")
delete(config, "description")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for output %s: %s",
n,
err)
}
// If we have depends fields, then add those in
var dependsOn []string
if o := listVal.Filter("depends_on"); len(o.Items) > 0 {
err := hcl.DecodeObject(&dependsOn, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading depends_on for output %q: %s",
n,
err)
}
}
// If we have a description field, then filter that
var description string
if o := listVal.Filter("description"); len(o.Items) > 0 {
err := hcl.DecodeObject(&description, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading description for output %q: %s",
n,
err)
}
}
result = append(result, &Output{
Name: n,
RawConfig: rawConfig,
DependsOn: dependsOn,
Description: description,
})
}
return result, nil
}
// LoadVariablesHcl recurses into the given HCL object and turns
// it into a list of variables.
func loadVariablesHcl(list *ast.ObjectList) ([]*Variable, error) {
if err := assertAllBlocksHaveNames("variable", list); err != nil {
return nil, err
}
list = list.Children()
// hclVariable is the structure each variable is decoded into
type hclVariable struct {
DeclaredType string `hcl:"type"`
Default interface{}
Description string
Fields []string `hcl:",decodedFields"`
}
// Go through each object and turn it into an actual result.
result := make([]*Variable, 0, len(list.Items))
for _, item := range list.Items {
// Clean up items from JSON
unwrapHCLObjectKeysFromJSON(item, 1)
// Verify the keys
if len(item.Keys) != 1 {
return nil, fmt.Errorf(
"position %s: 'variable' must be followed by exactly one strings: a name",
item.Pos())
}
n := item.Keys[0].Token.Value().(string)
if !NameRegexp.MatchString(n) {
return nil, fmt.Errorf(
"position %s: 'variable' name must match regular expression: %s",
item.Pos(), NameRegexp)
}
// Check for invalid keys
valid := []string{"type", "default", "description"}
if err := checkHCLKeys(item.Val, valid); err != nil {
return nil, multierror.Prefix(err, fmt.Sprintf(
"variable[%s]:", n))
}
// Decode into hclVariable to get typed values
var hclVar hclVariable
if err := hcl.DecodeObject(&hclVar, item.Val); err != nil {
return nil, err
}
// Defaults turn into a slice of map[string]interface{} and
// we need to make sure to convert that down into the
// proper type for Config.
if ms, ok := hclVar.Default.([]map[string]interface{}); ok {
def := make(map[string]interface{})
for _, m := range ms {
for k, v := range m {
def[k] = v
}
}
hclVar.Default = def
}
// Build the new variable and do some basic validation
newVar := &Variable{
Name: n,
DeclaredType: hclVar.DeclaredType,
Default: hclVar.Default,
Description: hclVar.Description,
}
if err := newVar.ValidateTypeAndDefault(); err != nil {
return nil, err
}
result = append(result, newVar)
}
return result, nil
}
// LoadProvidersHcl recurses into the given HCL object and turns
// it into a mapping of provider configs.
func loadProvidersHcl(list *ast.ObjectList) ([]*ProviderConfig, error) {
if err := assertAllBlocksHaveNames("provider", list); err != nil {
return nil, err
}
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Go through each object and turn it into an actual result.
result := make([]*ProviderConfig, 0, len(list.Items))
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("module '%s': should be an object", n)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, err
}
delete(config, "alias")
delete(config, "version")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for provider config %s: %s",
n,
err)
}
// If we have an alias field, then add those in
var alias string
if a := listVal.Filter("alias"); len(a.Items) > 0 {
err := hcl.DecodeObject(&alias, a.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading alias for provider[%s]: %s",
n,
err)
}
}
// If we have a version field then extract it
var version string
if a := listVal.Filter("version"); len(a.Items) > 0 {
err := hcl.DecodeObject(&version, a.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading version for provider[%s]: %s",
n,
err)
}
}
result = append(result, &ProviderConfig{
Name: n,
Alias: alias,
Version: version,
RawConfig: rawConfig,
})
}
return result, nil
}
// Given a handle to a HCL object, this recurses into the structure
// and pulls out a list of data sources.
//
// The resulting data sources may not be unique, but each one
// represents exactly one data definition in the HCL configuration.
// We leave it up to another pass to merge them together.
func loadDataResourcesHcl(list *ast.ObjectList) ([]*Resource, error) {
if err := assertAllBlocksHaveNames("data", list); err != nil {
return nil, err
}
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Where all the results will go
var result []*Resource
// Now go over all the types and their children in order to get
// all of the actual resources.
for _, item := range list.Items {
if len(item.Keys) != 2 {
return nil, fmt.Errorf(
"position %s: 'data' must be followed by exactly two strings: a type and a name",
item.Pos())
}
t := item.Keys[0].Token.Value().(string)
k := item.Keys[1].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("data sources %s[%s]: should be an object", t, k)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading config for %s[%s]: %s",
t,
k,
err)
}
// Remove the fields we handle specially
delete(config, "depends_on")
delete(config, "provider")
delete(config, "count")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for %s[%s]: %s",
t,
k,
err)
}
// If we have a count, then figure it out
var count string = "1"
if o := listVal.Filter("count"); len(o.Items) > 0 {
err = hcl.DecodeObject(&count, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error parsing count for %s[%s]: %s",
t,
k,
err)
}
}
countConfig, err := NewRawConfig(map[string]interface{}{
"count": count,
})
if err != nil {
return nil, err
}
countConfig.Key = "count"
// If we have depends fields, then add those in
var dependsOn []string
if o := listVal.Filter("depends_on"); len(o.Items) > 0 {
err := hcl.DecodeObject(&dependsOn, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading depends_on for %s[%s]: %s",
t,
k,
err)
}
}
// If we have a provider, then parse it out
var provider string
if o := listVal.Filter("provider"); len(o.Items) > 0 {
err := hcl.DecodeObject(&provider, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading provider for %s[%s]: %s",
t,
k,
err)
}
}
result = append(result, &Resource{
Mode: DataResourceMode,
Name: k,
Type: t,
RawCount: countConfig,
RawConfig: rawConfig,
Provider: provider,
Provisioners: []*Provisioner{},
DependsOn: dependsOn,
Lifecycle: ResourceLifecycle{},
})
}
return result, nil
}
// Given a handle to a HCL object, this recurses into the structure
// and pulls out a list of managed resources.
//
// The resulting resources may not be unique, but each resource
// represents exactly one "resource" block in the HCL configuration.
// We leave it up to another pass to merge them together.
func loadManagedResourcesHcl(list *ast.ObjectList) ([]*Resource, error) {
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Where all the results will go
var result []*Resource
// Now go over all the types and their children in order to get
// all of the actual resources.
for _, item := range list.Items {
// GH-4385: We detect a pure provisioner resource and give the user
// an error about how to do it cleanly.
if len(item.Keys) == 4 && item.Keys[2].Token.Value().(string) == "provisioner" {
return nil, fmt.Errorf(
"position %s: provisioners in a resource should be wrapped in a list\n\n"+
"Example: \"provisioner\": [ { \"local-exec\": ... } ]",
item.Pos())
}
// Fix up JSON input
unwrapHCLObjectKeysFromJSON(item, 2)
if len(item.Keys) != 2 {
return nil, fmt.Errorf(
"position %s: resource must be followed by exactly two strings, a type and a name",
item.Pos())
}
t := item.Keys[0].Token.Value().(string)
k := item.Keys[1].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("resources %s[%s]: should be an object", t, k)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading config for %s[%s]: %s",
t,
k,
err)
}
// Remove the fields we handle specially
delete(config, "connection")
delete(config, "count")
delete(config, "depends_on")
delete(config, "provisioner")
delete(config, "provider")
delete(config, "lifecycle")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for %s[%s]: %s",
t,
k,
err)
}
// If we have a count, then figure it out
var count string = "1"
if o := listVal.Filter("count"); len(o.Items) > 0 {
err = hcl.DecodeObject(&count, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error parsing count for %s[%s]: %s",
t,
k,
err)
}
}
countConfig, err := NewRawConfig(map[string]interface{}{
"count": count,
})
if err != nil {
return nil, err
}
countConfig.Key = "count"
// If we have depends fields, then add those in
var dependsOn []string
if o := listVal.Filter("depends_on"); len(o.Items) > 0 {
err := hcl.DecodeObject(&dependsOn, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading depends_on for %s[%s]: %s",
t,
k,
err)
}
}
// If we have connection info, then parse those out
var connInfo map[string]interface{}
if o := listVal.Filter("connection"); len(o.Items) > 0 {
err := hcl.DecodeObject(&connInfo, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading connection info for %s[%s]: %s",
t,
k,
err)
}
}
// If we have provisioners, then parse those out
var provisioners []*Provisioner
if os := listVal.Filter("provisioner"); len(os.Items) > 0 {
var err error
provisioners, err = loadProvisionersHcl(os, connInfo)
if err != nil {
return nil, fmt.Errorf(
"Error reading provisioners for %s[%s]: %s",
t,
k,
err)
}
}
// If we have a provider, then parse it out
var provider string
if o := listVal.Filter("provider"); len(o.Items) > 0 {
err := hcl.DecodeObject(&provider, o.Items[0].Val)
if err != nil {
return nil, fmt.Errorf(
"Error reading provider for %s[%s]: %s",
t,
k,
err)
}
}
// Check if the resource should be re-created before
// destroying the existing instance
var lifecycle ResourceLifecycle
if o := listVal.Filter("lifecycle"); len(o.Items) > 0 {
if len(o.Items) > 1 {
return nil, fmt.Errorf(
"%s[%s]: Multiple lifecycle blocks found, expected one",
t, k)
}
// Check for invalid keys
valid := []string{"create_before_destroy", "ignore_changes", "prevent_destroy"}
if err := checkHCLKeys(o.Items[0].Val, valid); err != nil {
return nil, multierror.Prefix(err, fmt.Sprintf(
"%s[%s]:", t, k))
}
var raw map[string]interface{}
if err = hcl.DecodeObject(&raw, o.Items[0].Val); err != nil {
return nil, fmt.Errorf(
"Error parsing lifecycle for %s[%s]: %s",
t,
k,
err)
}
if err := mapstructure.WeakDecode(raw, &lifecycle); err != nil {
return nil, fmt.Errorf(
"Error parsing lifecycle for %s[%s]: %s",
t,
k,
err)
}
}
result = append(result, &Resource{
Mode: ManagedResourceMode,
Name: k,
Type: t,
RawCount: countConfig,
RawConfig: rawConfig,
Provisioners: provisioners,
Provider: provider,
DependsOn: dependsOn,
Lifecycle: lifecycle,
})
}
return result, nil
}
func loadProvisionersHcl(list *ast.ObjectList, connInfo map[string]interface{}) ([]*Provisioner, error) {
if err := assertAllBlocksHaveNames("provisioner", list); err != nil {
return nil, err
}
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Go through each object and turn it into an actual result.
result := make([]*Provisioner, 0, len(list.Items))
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("provisioner '%s': should be an object", n)
}
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, err
}
// Parse the "when" value
when := ProvisionerWhenCreate
if v, ok := config["when"]; ok {
switch v {
case "create":
when = ProvisionerWhenCreate
case "destroy":
when = ProvisionerWhenDestroy
default:
return nil, fmt.Errorf(
"position %s: 'provisioner' when must be 'create' or 'destroy'",
item.Pos())
}
}
// Parse the "on_failure" value
onFailure := ProvisionerOnFailureFail
if v, ok := config["on_failure"]; ok {
switch v {
case "continue":
onFailure = ProvisionerOnFailureContinue
case "fail":
onFailure = ProvisionerOnFailureFail
default:
return nil, fmt.Errorf(
"position %s: 'provisioner' on_failure must be 'continue' or 'fail'",
item.Pos())
}
}
// Delete fields we special case
delete(config, "connection")
delete(config, "when")
delete(config, "on_failure")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, err
}
// Check if we have a provisioner-level connection
// block that overrides the resource-level
var subConnInfo map[string]interface{}
if o := listVal.Filter("connection"); len(o.Items) > 0 {
err := hcl.DecodeObject(&subConnInfo, o.Items[0].Val)
if err != nil {
return nil, err
}
}
// Inherit from the resource connInfo any keys
// that are not explicitly overriden.
if connInfo != nil && subConnInfo != nil {
for k, v := range connInfo {
if _, ok := subConnInfo[k]; !ok {
subConnInfo[k] = v
}
}
} else if subConnInfo == nil {
subConnInfo = connInfo
}
// Parse the connInfo
connRaw, err := NewRawConfig(subConnInfo)
if err != nil {
return nil, err
}
result = append(result, &Provisioner{
Type: n,
RawConfig: rawConfig,
ConnInfo: connRaw,
When: when,
OnFailure: onFailure,
})
}
return result, nil
}
/*
func hclObjectMap(os *hclobj.Object) map[string]ast.ListNode {
objects := make(map[string][]*hclobj.Object)
for _, o := range os.Elem(false) {
for _, elem := range o.Elem(true) {
val, ok := objects[elem.Key]
if !ok {
val = make([]*hclobj.Object, 0, 1)
}
val = append(val, elem)
objects[elem.Key] = val
}
}
return objects
}
*/
// assertAllBlocksHaveNames returns an error if any of the items in
// the given object list are blocks without keys (like "module {}")
// or simple assignments (like "module = 1"). It returns nil if
// neither of these things are true.
//
// The given name is used in any generated error messages, and should
// be the name of the block we're dealing with. The given list should
// be the result of calling .Filter on an object list with that same
// name.
func assertAllBlocksHaveNames(name string, list *ast.ObjectList) error {
if elem := list.Elem(); len(elem.Items) != 0 {
switch et := elem.Items[0].Val.(type) {
case *ast.ObjectType:
pos := et.Lbrace
return fmt.Errorf("%s: %q must be followed by a name", pos, name)
default:
pos := elem.Items[0].Val.Pos()
return fmt.Errorf("%s: %q must be a configuration block", pos, name)
}
}
return nil
}
func checkHCLKeys(node ast.Node, valid []string) error {
var list *ast.ObjectList
switch n := node.(type) {
case *ast.ObjectList:
list = n
case *ast.ObjectType:
list = n.List
default:
return fmt.Errorf("cannot check HCL keys of type %T", n)
}
validMap := make(map[string]struct{}, len(valid))
for _, v := range valid {
validMap[v] = struct{}{}
}
var result error
for _, item := range list.Items {
key := item.Keys[0].Token.Value().(string)
if _, ok := validMap[key]; !ok {
result = multierror.Append(result, fmt.Errorf(
"invalid key: %s", key))
}
}
return result
}
// unwrapHCLObjectKeysFromJSON cleans up an edge case that can occur when
// parsing JSON as input: if we're parsing JSON then directly nested
// items will show up as additional "keys".
//
// For objects that expect a fixed number of keys, this breaks the
// decoding process. This function unwraps the object into what it would've
// looked like if it came directly from HCL by specifying the number of keys
// you expect.
//
// Example:
//
// { "foo": { "baz": {} } }
//
// Will show up with Keys being: []string{"foo", "baz"}
// when we really just want the first two. This function will fix this.
func unwrapHCLObjectKeysFromJSON(item *ast.ObjectItem, depth int) {
if len(item.Keys) > depth && item.Keys[0].Token.JSON {
for len(item.Keys) > depth {
// Pop off the last key
n := len(item.Keys)
key := item.Keys[n-1]
item.Keys[n-1] = nil
item.Keys = item.Keys[:n-1]
// Wrap our value in a list
item.Val = &ast.ObjectType{
List: &ast.ObjectList{
Items: []*ast.ObjectItem{
&ast.ObjectItem{
Keys: []*ast.ObjectKey{key},
Val: item.Val,
},
},
},
}
}
}
}