terraform/config/loader_hcl.go

495 lines
11 KiB
Go

package config
import (
"fmt"
"io/ioutil"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/ast"
)
// hclConfigurable is an implementation of configurable that knows
// how to turn HCL configuration into a *Config object.
type hclConfigurable struct {
File string
Object *ast.ObjectNode
}
func (t *hclConfigurable) Config() (*Config, error) {
validKeys := map[string]struct{}{
"output": struct{}{},
"provider": struct{}{},
"resource": struct{}{},
"variable": struct{}{},
}
type hclVariable struct {
Default interface{}
Description string
Fields []string `hcl:",decodedFields"`
}
var rawConfig struct {
Variable map[string]*hclVariable
}
if err := hcl.DecodeAST(&rawConfig, t.Object); err != nil {
return nil, err
}
// Start building up the actual configuration. We start with
// variables.
// TODO(mitchellh): Make function like loadVariablesHcl so that
// duplicates aren't overriden
config := new(Config)
if len(rawConfig.Variable) > 0 {
config.Variables = make([]*Variable, 0, len(rawConfig.Variable))
for k, v := range rawConfig.Variable {
// 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 := v.Default.([]map[string]interface{}); ok {
def := make(map[string]interface{})
for _, m := range ms {
for k, v := range m {
def[k] = v
}
}
v.Default = def
}
newVar := &Variable{
Name: k,
Default: v.Default,
Description: v.Description,
}
config.Variables = append(config.Variables, newVar)
}
}
// Build the provider configs
if providers := t.Object.Get("provider", false); providers != nil {
var err error
config.ProviderConfigs, err = loadProvidersHcl(providers)
if err != nil {
return nil, err
}
}
// Build the resources
if resources := t.Object.Get("resource", false); resources != nil {
var err error
config.Resources, err = loadResourcesHcl(resources)
if err != nil {
return nil, err
}
}
// Build the outputs
if outputs := t.Object.Get("output", false); outputs != nil {
var err error
config.Outputs, err = loadOutputsHcl(outputs)
if err != nil {
return nil, err
}
}
// Check for invalid keys
for _, elem := range t.Object.Elem {
k := elem.Key()
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) {
var obj *ast.ObjectNode = nil
// 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
obj, 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,
Object: obj,
}
// 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
}
// LoadOutputsHcl recurses into the given HCL object and turns
// it into a mapping of outputs.
func loadOutputsHcl(ns []ast.Node) ([]*Output, error) {
objects := hclObjectMap(ns)
if len(objects) == 0 {
return nil, nil
}
// Go through each object and turn it into an actual result.
result := make([]*Output, 0, len(objects))
for n, o := range objects {
var config map[string]interface{}
if err := hcl.DecodeAST(&config, o); err != nil {
return nil, err
}
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for output %s: %s",
n,
err)
}
result = append(result, &Output{
Name: n,
RawConfig: rawConfig,
})
}
return result, nil
}
// LoadProvidersHcl recurses into the given HCL object and turns
// it into a mapping of provider configs.
func loadProvidersHcl(ns []ast.Node) ([]*ProviderConfig, error) {
objects := hclObjectMap(ns)
if len(objects) == 0 {
return nil, nil
}
// Go through each object and turn it into an actual result.
result := make([]*ProviderConfig, 0, len(objects))
for n, o := range objects {
var config map[string]interface{}
if err := hcl.DecodeAST(&config, o); err != nil {
return nil, err
}
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for provider config %s: %s",
n,
err)
}
result = append(result, &ProviderConfig{
Name: n,
RawConfig: rawConfig,
})
}
return result, nil
}
// Given a handle to a HCL object, this recurses into the structure
// and pulls out a list of resources.
//
// The resulting resources may not be unique, but each resource
// represents exactly one resource definition in the HCL configuration.
// We leave it up to another pass to merge them together.
func loadResourcesHcl(ns []ast.Node) ([]*Resource, error) {
typeMap := hclObjectMap(ns)
// 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 t, rs := range typeMap {
resourceMap := hclObjectMap([]ast.Node{rs})
for k, o := range resourceMap {
for _, o := range o.Elem {
obj, ok := o.(ast.ObjectNode)
if !ok {
continue
}
var config map[string]interface{}
if err := hcl.DecodeAST(&config, o); 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")
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 int = 1
if os := obj.Get("count", false); os != nil {
for _, o := range os {
err = hcl.DecodeAST(&count, o)
if err != nil {
return nil, fmt.Errorf(
"Error parsing count for %s[%s]: %s",
t,
k,
err)
}
}
}
// If we have depends fields, then add those in
var dependsOn []string
if os := obj.Get("depends_on", false); os != nil {
for _, o := range os {
err := hcl.DecodeAST(&dependsOn, o)
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 os := obj.Get("connection", false); os != nil {
for _, o := range os {
err := hcl.DecodeAST(&connInfo, o)
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 := obj.Get("provisioner", false); os != nil {
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)
}
}
result = append(result, &Resource{
Name: k,
Type: t,
Count: count,
RawConfig: rawConfig,
Provisioners: provisioners,
DependsOn: dependsOn,
})
}
}
}
return result, nil
}
func loadProvisionersHcl(ns []ast.Node, connInfo map[string]interface{}) ([]*Provisioner, error) {
pos := make([]ast.AssignmentNode, 0, len(ns))
// Accumulate all the actual provisioner configuration objects. We
// have to iterate twice here:
//
// 1. The first iteration is of the list of `provisioner` blocks.
// 2. The second iteration is of the dictionary within the
// provisioner which will have only one element which is the
// type of provisioner to use along with tis config.
//
// In JSON it looks kind of like this:
//
// [
// {
// "shell": {
// ...
// }
// }
// ]
//
for _, n := range ns {
obj, ok := n.(ast.ObjectNode)
if !ok {
continue
}
for _, elem := range obj.Elem {
pos = append(pos, elem)
}
}
// Short-circuit if there are no items
if len(pos) == 0 {
return nil, nil
}
result := make([]*Provisioner, 0, len(pos))
for _, po := range pos {
obj, ok := po.Value.(ast.ObjectNode)
if !ok {
continue
}
var config map[string]interface{}
if err := hcl.DecodeAST(&config, obj); err != nil {
return nil, err
}
// Delete the "connection" section, handle seperately
delete(config, "connection")
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 os := obj.Get("connection", false); os != nil {
for _, o := range os {
err := hcl.DecodeAST(&subConnInfo, o)
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: po.Key(),
RawConfig: rawConfig,
ConnInfo: connRaw,
})
}
return result, nil
}
func hclObjectMap(ns []ast.Node) map[string]ast.ListNode {
objects := make(map[string]ast.ListNode)
for _, n := range ns {
ns := []ast.Node{n}
if ln, ok := n.(ast.ListNode); ok {
ns = ln.Elem
}
for _, n := range ns {
obj, ok := n.(ast.ObjectNode)
if !ok {
continue
}
for _, elem := range obj.Elem {
val, ok := objects[elem.Key()]
if !ok {
val = ast.ListNode{}
}
val.Elem = append(val.Elem, elem.Value)
objects[elem.Key()] = val
}
}
}
return objects
}