648 lines
15 KiB
Go
648 lines
15 KiB
Go
package config
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import (
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"fmt"
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"io/ioutil"
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"github.com/hashicorp/hcl"
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"github.com/hashicorp/hcl/hcl/ast"
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"github.com/mitchellh/mapstructure"
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)
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// hclConfigurable is an implementation of configurable that knows
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// how to turn HCL configuration into a *Config object.
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type hclConfigurable struct {
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File string
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Root *ast.File
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}
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func (t *hclConfigurable) Config() (*Config, error) {
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validKeys := map[string]struct{}{
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"atlas": struct{}{},
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"module": struct{}{},
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"output": struct{}{},
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"provider": struct{}{},
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"resource": struct{}{},
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"variable": struct{}{},
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}
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type hclVariable struct {
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Default interface{}
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Description string
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Fields []string `hcl:",decodedFields"`
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}
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var rawConfig struct {
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Variable map[string]*hclVariable
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}
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// Top-level item should be the object list
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list, ok := t.Root.Node.(*ast.ObjectList)
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if !ok {
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return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
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}
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if err := hcl.DecodeObject(&rawConfig, list); err != nil {
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return nil, err
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}
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// Start building up the actual configuration. We start with
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// variables.
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// TODO(mitchellh): Make function like loadVariablesHcl so that
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// duplicates aren't overriden
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config := new(Config)
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if len(rawConfig.Variable) > 0 {
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config.Variables = make([]*Variable, 0, len(rawConfig.Variable))
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for k, v := range rawConfig.Variable {
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// Defaults turn into a slice of map[string]interface{} and
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// we need to make sure to convert that down into the
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// proper type for Config.
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if ms, ok := v.Default.([]map[string]interface{}); ok {
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def := make(map[string]interface{})
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for _, m := range ms {
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for k, v := range m {
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def[k] = v
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}
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}
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v.Default = def
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}
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newVar := &Variable{
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Name: k,
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Default: v.Default,
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Description: v.Description,
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}
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config.Variables = append(config.Variables, newVar)
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}
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}
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// Get Atlas configuration
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if atlas := list.Filter("atlas"); len(atlas.Items) > 0 {
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var err error
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config.Atlas, err = loadAtlasHcl(atlas)
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if err != nil {
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return nil, err
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}
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}
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// Build the modules
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if modules := list.Filter("module"); len(modules.Items) > 0 {
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var err error
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config.Modules, err = loadModulesHcl(modules)
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if err != nil {
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return nil, err
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}
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}
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// Build the provider configs
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if providers := list.Filter("provider"); len(providers.Items) > 0 {
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var err error
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config.ProviderConfigs, err = loadProvidersHcl(providers)
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if err != nil {
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return nil, err
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}
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}
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// Build the resources
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if resources := list.Filter("resource"); len(resources.Items) > 0 {
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var err error
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config.Resources, err = loadResourcesHcl(resources)
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if err != nil {
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return nil, err
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}
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}
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// Build the outputs
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if outputs := list.Filter("output"); len(outputs.Items) > 0 {
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var err error
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config.Outputs, err = loadOutputsHcl(outputs)
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if err != nil {
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return nil, err
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}
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}
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// Check for invalid keys
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for _, item := range list.Items {
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if len(item.Keys) == 0 {
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// Not sure how this would happen, but let's avoid a panic
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continue
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}
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k := item.Keys[0].Token.Value().(string)
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if _, ok := validKeys[k]; ok {
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continue
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}
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config.unknownKeys = append(config.unknownKeys, k)
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}
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return config, nil
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}
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// loadFileHcl is a fileLoaderFunc that knows how to read HCL
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// files and turn them into hclConfigurables.
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func loadFileHcl(root string) (configurable, []string, error) {
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// Read the HCL file and prepare for parsing
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d, err := ioutil.ReadFile(root)
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if err != nil {
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return nil, nil, fmt.Errorf(
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"Error reading %s: %s", root, err)
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}
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// Parse it
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hclRoot, err := hcl.Parse(string(d))
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if err != nil {
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return nil, nil, fmt.Errorf(
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"Error parsing %s: %s", root, err)
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}
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// Start building the result
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result := &hclConfigurable{
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File: root,
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Root: hclRoot,
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}
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// Dive in, find the imports. This is disabled for now since
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// imports were removed prior to Terraform 0.1. The code is
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// remaining here commented for historical purposes.
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/*
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imports := obj.Get("import")
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if imports == nil {
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result.Object.Ref()
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return result, nil, nil
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}
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if imports.Type() != libucl.ObjectTypeString {
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imports.Close()
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return nil, nil, fmt.Errorf(
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"Error in %s: all 'import' declarations should be in the format\n"+
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"`import \"foo\"` (Got type %s)",
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root,
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imports.Type())
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}
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// Gather all the import paths
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importPaths := make([]string, 0, imports.Len())
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iter := imports.Iterate(false)
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for imp := iter.Next(); imp != nil; imp = iter.Next() {
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path := imp.ToString()
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if !filepath.IsAbs(path) {
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// Relative paths are relative to the Terraform file itself
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dir := filepath.Dir(root)
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path = filepath.Join(dir, path)
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}
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importPaths = append(importPaths, path)
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imp.Close()
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}
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iter.Close()
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imports.Close()
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result.Object.Ref()
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*/
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return result, nil, nil
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}
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// Given a handle to a HCL object, this transforms it into the Atlas
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// configuration.
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func loadAtlasHcl(list *ast.ObjectList) (*AtlasConfig, error) {
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if len(list.Items) > 1 {
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return nil, fmt.Errorf("only one 'atlas' block allowed")
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}
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// Get our one item
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item := list.Items[0]
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var config AtlasConfig
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if err := hcl.DecodeObject(&config, item.Val); err != nil {
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return nil, fmt.Errorf(
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"Error reading atlas config: %s",
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err)
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}
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return &config, nil
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}
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// Given a handle to a HCL object, this recurses into the structure
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// and pulls out a list of modules.
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//
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// The resulting modules may not be unique, but each module
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// represents exactly one module definition in the HCL configuration.
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// We leave it up to another pass to merge them together.
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func loadModulesHcl(list *ast.ObjectList) ([]*Module, error) {
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list = list.Children()
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if len(list.Items) == 0 {
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return nil, nil
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}
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// Where all the results will go
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var result []*Module
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// Now go over all the types and their children in order to get
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// all of the actual resources.
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for _, item := range list.Items {
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k := item.Keys[0].Token.Value().(string)
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var listVal *ast.ObjectList
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if ot, ok := item.Val.(*ast.ObjectType); ok {
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listVal = ot.List
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} else {
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return nil, fmt.Errorf("module '%s': should be an object", k)
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}
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var config map[string]interface{}
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if err := hcl.DecodeObject(&config, item.Val); err != nil {
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return nil, fmt.Errorf(
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"Error reading config for %s: %s",
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k,
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err)
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}
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// Remove the fields we handle specially
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delete(config, "source")
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rawConfig, err := NewRawConfig(config)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading config for %s: %s",
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k,
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err)
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}
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// If we have a count, then figure it out
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var source string
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if o := listVal.Filter("source"); len(o.Items) > 0 {
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err = hcl.DecodeObject(&source, o.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error parsing source for %s: %s",
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k,
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err)
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}
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}
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result = append(result, &Module{
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Name: k,
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Source: source,
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RawConfig: rawConfig,
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})
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}
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return result, nil
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}
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// LoadOutputsHcl recurses into the given HCL object and turns
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// it into a mapping of outputs.
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func loadOutputsHcl(list *ast.ObjectList) ([]*Output, error) {
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list = list.Children()
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if len(list.Items) == 0 {
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return nil, nil
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}
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// Go through each object and turn it into an actual result.
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result := make([]*Output, 0, len(list.Items))
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for _, item := range list.Items {
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n := item.Keys[0].Token.Value().(string)
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var config map[string]interface{}
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if err := hcl.DecodeObject(&config, item.Val); err != nil {
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return nil, err
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}
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rawConfig, err := NewRawConfig(config)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading config for output %s: %s",
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n,
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err)
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}
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result = append(result, &Output{
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Name: n,
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RawConfig: rawConfig,
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})
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}
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return result, nil
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}
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// LoadProvidersHcl recurses into the given HCL object and turns
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// it into a mapping of provider configs.
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func loadProvidersHcl(list *ast.ObjectList) ([]*ProviderConfig, error) {
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list = list.Children()
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if len(list.Items) == 0 {
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return nil, nil
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}
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// Go through each object and turn it into an actual result.
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result := make([]*ProviderConfig, 0, len(list.Items))
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for _, item := range list.Items {
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n := item.Keys[0].Token.Value().(string)
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var listVal *ast.ObjectList
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if ot, ok := item.Val.(*ast.ObjectType); ok {
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listVal = ot.List
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} else {
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return nil, fmt.Errorf("module '%s': should be an object", n)
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}
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var config map[string]interface{}
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if err := hcl.DecodeObject(&config, item.Val); err != nil {
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return nil, err
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}
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delete(config, "alias")
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rawConfig, err := NewRawConfig(config)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading config for provider config %s: %s",
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n,
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err)
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}
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// If we have an alias field, then add those in
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var alias string
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if a := listVal.Filter("alias"); len(a.Items) > 0 {
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err := hcl.DecodeObject(&alias, a.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading alias for provider[%s]: %s",
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n,
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err)
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}
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}
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result = append(result, &ProviderConfig{
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Name: n,
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Alias: alias,
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RawConfig: rawConfig,
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})
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}
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return result, nil
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}
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// Given a handle to a HCL object, this recurses into the structure
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// and pulls out a list of resources.
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//
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// The resulting resources may not be unique, but each resource
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// represents exactly one resource definition in the HCL configuration.
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// We leave it up to another pass to merge them together.
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func loadResourcesHcl(list *ast.ObjectList) ([]*Resource, error) {
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list = list.Children()
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if len(list.Items) == 0 {
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return nil, nil
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}
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// Where all the results will go
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var result []*Resource
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// Now go over all the types and their children in order to get
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// all of the actual resources.
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for _, item := range list.Items {
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if len(item.Keys) != 2 {
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return nil, fmt.Errorf(
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"position %s: resource must be followed by exactly two strings, a type and a name",
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item.Pos())
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}
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t := item.Keys[0].Token.Value().(string)
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k := item.Keys[1].Token.Value().(string)
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var listVal *ast.ObjectList
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if ot, ok := item.Val.(*ast.ObjectType); ok {
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listVal = ot.List
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} else {
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return nil, fmt.Errorf("resources %s[%s]: should be an object", t, k)
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}
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var config map[string]interface{}
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if err := hcl.DecodeObject(&config, item.Val); err != nil {
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return nil, fmt.Errorf(
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"Error reading config for %s[%s]: %s",
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t,
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k,
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err)
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}
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// Remove the fields we handle specially
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delete(config, "connection")
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delete(config, "count")
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delete(config, "depends_on")
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delete(config, "provisioner")
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delete(config, "provider")
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delete(config, "lifecycle")
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rawConfig, err := NewRawConfig(config)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading config for %s[%s]: %s",
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t,
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k,
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err)
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}
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// If we have a count, then figure it out
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var count string = "1"
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if o := listVal.Filter("count"); len(o.Items) > 0 {
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err = hcl.DecodeObject(&count, o.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error parsing count for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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countConfig, err := NewRawConfig(map[string]interface{}{
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"count": count,
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})
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if err != nil {
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return nil, err
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}
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countConfig.Key = "count"
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// If we have depends fields, then add those in
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var dependsOn []string
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if o := listVal.Filter("depends_on"); len(o.Items) > 0 {
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err := hcl.DecodeObject(&dependsOn, o.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading depends_on for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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// If we have connection info, then parse those out
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var connInfo map[string]interface{}
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if o := listVal.Filter("connection"); len(o.Items) > 0 {
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err := hcl.DecodeObject(&connInfo, o.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading connection info for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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// If we have provisioners, then parse those out
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var provisioners []*Provisioner
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if os := listVal.Filter("provisioner"); len(os.Items) > 0 {
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var err error
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provisioners, err = loadProvisionersHcl(os, connInfo)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading provisioners for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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// If we have a provider, then parse it out
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var provider string
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if o := listVal.Filter("provider"); len(o.Items) > 0 {
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err := hcl.DecodeObject(&provider, o.Items[0].Val)
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if err != nil {
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return nil, fmt.Errorf(
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"Error reading provider for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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// Check if the resource should be re-created before
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// destroying the existing instance
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var lifecycle ResourceLifecycle
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if o := listVal.Filter("lifecycle"); len(o.Items) > 0 {
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var raw map[string]interface{}
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if err = hcl.DecodeObject(&raw, o.Items[0].Val); err != nil {
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return nil, fmt.Errorf(
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"Error parsing lifecycle for %s[%s]: %s",
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t,
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k,
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err)
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}
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if err := mapstructure.WeakDecode(raw, &lifecycle); err != nil {
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return nil, fmt.Errorf(
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"Error parsing lifecycle for %s[%s]: %s",
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t,
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k,
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err)
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}
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}
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result = append(result, &Resource{
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Name: k,
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Type: t,
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RawCount: countConfig,
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RawConfig: rawConfig,
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Provisioners: provisioners,
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Provider: provider,
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DependsOn: dependsOn,
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Lifecycle: lifecycle,
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})
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}
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return result, nil
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}
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|
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func loadProvisionersHcl(list *ast.ObjectList, connInfo map[string]interface{}) ([]*Provisioner, error) {
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list = list.Children()
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if len(list.Items) == 0 {
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return nil, nil
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}
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|
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// Go through each object and turn it into an actual result.
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result := make([]*Provisioner, 0, len(list.Items))
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for _, item := range list.Items {
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n := item.Keys[0].Token.Value().(string)
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var listVal *ast.ObjectList
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if ot, ok := item.Val.(*ast.ObjectType); ok {
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listVal = ot.List
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} else {
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return nil, fmt.Errorf("provisioner '%s': should be an object", n)
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}
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|
|
var config map[string]interface{}
|
|
if err := hcl.DecodeObject(&config, item.Val); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Delete the "connection" section, handle separately
|
|
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 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,
|
|
})
|
|
}
|
|
|
|
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
|
|
}
|
|
*/
|