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config: new HCL API

This commit is contained in:
Mitchell Hashimoto 2015-11-07 16:53:42 -08:00
parent 89a2734d07
commit 02f512d4bd
2 changed files with 249 additions and 272 deletions
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2
config/loader.go
View File

@ -25,7 +25,7 @@ func LoadJSON(raw json.RawMessage) (*Config, error) {
// Start building the result
hclConfig := &hclConfigurable{
Object: obj,
Root: obj,
}
return hclConfig.Config()

519
config/loader_hcl.go
View File

@ -5,15 +5,15 @@ import (
"io/ioutil"
"github.com/hashicorp/hcl"
hclobj "github.com/hashicorp/hcl/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
Object *hclobj.Object
File string
Root *ast.File
}
func (t *hclConfigurable) Config() (*Config, error) {
@ -36,7 +36,13 @@ func (t *hclConfigurable) Config() (*Config, error) {
Variable map[string]*hclVariable
}
if err := hcl.DecodeObject(&rawConfig, t.Object); err != nil {
// 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")
}
if err := hcl.DecodeObject(&rawConfig, list); err != nil {
return nil, err
}
@ -73,7 +79,7 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Get Atlas configuration
if atlas := t.Object.Get("atlas", false); atlas != nil {
if atlas := list.Filter("atlas"); len(atlas.Items) > 0 {
var err error
config.Atlas, err = loadAtlasHcl(atlas)
if err != nil {
@ -82,7 +88,7 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Build the modules
if modules := t.Object.Get("module", false); modules != nil {
if modules := list.Filter("module"); len(modules.Items) > 0 {
var err error
config.Modules, err = loadModulesHcl(modules)
if err != nil {
@ -91,7 +97,7 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Build the provider configs
if providers := t.Object.Get("provider", false); providers != nil {
if providers := list.Filter("provider"); len(providers.Items) > 0 {
var err error
config.ProviderConfigs, err = loadProvidersHcl(providers)
if err != nil {
@ -100,7 +106,7 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Build the resources
if resources := t.Object.Get("resource", false); resources != nil {
if resources := list.Filter("resource"); len(resources.Items) > 0 {
var err error
config.Resources, err = loadResourcesHcl(resources)
if err != nil {
@ -109,7 +115,7 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Build the outputs
if outputs := t.Object.Get("output", false); outputs != nil {
if outputs := list.Filter("output"); len(outputs.Items) > 0 {
var err error
config.Outputs, err = loadOutputsHcl(outputs)
if err != nil {
@ -118,8 +124,13 @@ func (t *hclConfigurable) Config() (*Config, error) {
}
// Check for invalid keys
for _, elem := range t.Object.Elem(true) {
k := elem.Key
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
}
@ -133,8 +144,6 @@ func (t *hclConfigurable) Config() (*Config, error) {
// 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 *hclobj.Object = nil
// Read the HCL file and prepare for parsing
d, err := ioutil.ReadFile(root)
if err != nil {
@ -143,7 +152,7 @@ func loadFileHcl(root string) (configurable, []string, error) {
}
// Parse it
obj, err = hcl.Parse(string(d))
hclRoot, err := hcl.Parse(string(d))
if err != nil {
return nil, nil, fmt.Errorf(
"Error parsing %s: %s", root, err)
@ -151,8 +160,8 @@ func loadFileHcl(root string) (configurable, []string, error) {
// Start building the result
result := &hclConfigurable{
File: root,
Object: obj,
File: root,
Root: hclRoot,
}
// Dive in, find the imports. This is disabled for now since
@ -200,9 +209,16 @@ func loadFileHcl(root string) (configurable, []string, error) {
// Given a handle to a HCL object, this transforms it into the Atlas
// configuration.
func loadAtlasHcl(obj *hclobj.Object) (*AtlasConfig, error) {
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, obj); err != nil {
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading atlas config: %s",
err)
@ -217,18 +233,10 @@ func loadAtlasHcl(obj *hclobj.Object) (*AtlasConfig, error) {
// 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(os *hclobj.Object) ([]*Module, error) {
var allNames []*hclobj.Object
// See loadResourcesHcl for why this exists. Don't touch this.
for _, o1 := range os.Elem(false) {
// Iterate the inner to get the list of types
for _, o2 := range o1.Elem(true) {
// Iterate all of this type to get _all_ the types
for _, o3 := range o2.Elem(false) {
allNames = append(allNames, o3)
}
}
func loadModulesHcl(list *ast.ObjectList) ([]*Module, error) {
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Where all the results will go
@ -236,11 +244,18 @@ func loadModulesHcl(os *hclobj.Object) ([]*Module, error) {
// Now go over all the types and their children in order to get
// all of the actual resources.
for _, obj := range allNames {
k := obj.Key
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, obj); err != nil {
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, fmt.Errorf(
"Error reading config for %s: %s",
k,
@ -260,8 +275,8 @@ func loadModulesHcl(os *hclobj.Object) ([]*Module, error) {
// If we have a count, then figure it out
var source string
if o := obj.Get("source", false); o != nil {
err = hcl.DecodeObject(&source, o)
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",
@ -282,27 +297,19 @@ func loadModulesHcl(os *hclobj.Object) ([]*Module, error) {
// LoadOutputsHcl recurses into the given HCL object and turns
// it into a mapping of outputs.
func loadOutputsHcl(os *hclobj.Object) ([]*Output, error) {
objects := make(map[string]*hclobj.Object)
// Iterate over all the "output" blocks and get the keys along with
// their raw configuration objects. We'll parse those later.
for _, o1 := range os.Elem(false) {
for _, o2 := range o1.Elem(true) {
objects[o2.Key] = o2
}
}
if len(objects) == 0 {
func loadOutputsHcl(list *ast.ObjectList) ([]*Output, error) {
list = list.Children()
if len(list.Items) == 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{}
result := make([]*Output, 0, len(list.Items))
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
if err := hcl.DecodeObject(&config, o); err != nil {
var config map[string]interface{}
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, err
}
@ -325,27 +332,26 @@ func loadOutputsHcl(os *hclobj.Object) ([]*Output, error) {
// LoadProvidersHcl recurses into the given HCL object and turns
// it into a mapping of provider configs.
func loadProvidersHcl(os *hclobj.Object) ([]*ProviderConfig, error) {
var objects []*hclobj.Object
// Iterate over all the "provider" blocks and get the keys along with
// their raw configuration objects. We'll parse those later.
for _, o1 := range os.Elem(false) {
for _, o2 := range o1.Elem(true) {
objects = append(objects, o2)
}
}
if len(objects) == 0 {
func loadProvidersHcl(list *ast.ObjectList) ([]*ProviderConfig, error) {
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(objects))
for _, o := range objects {
var config map[string]interface{}
result := make([]*ProviderConfig, 0, len(list.Items))
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
if err := hcl.DecodeObject(&config, o); err != nil {
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
}
@ -355,24 +361,24 @@ func loadProvidersHcl(os *hclobj.Object) ([]*ProviderConfig, error) {
if err != nil {
return nil, fmt.Errorf(
"Error reading config for provider config %s: %s",
o.Key,
n,
err)
}
// If we have an alias field, then add those in
var alias string
if a := o.Get("alias", false); a != nil {
err := hcl.DecodeObject(&alias, a)
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",
o.Key,
n,
err)
}
}
result = append(result, &ProviderConfig{
Name: o.Key,
Name: n,
Alias: alias,
RawConfig: rawConfig,
})
@ -387,27 +393,10 @@ func loadProvidersHcl(os *hclobj.Object) ([]*ProviderConfig, error) {
// 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(os *hclobj.Object) ([]*Resource, error) {
var allTypes []*hclobj.Object
// HCL object iteration is really nasty. Below is likely to make
// no sense to anyone approaching this code. Luckily, it is very heavily
// tested. If working on a bug fix or feature, we recommend writing a
// test first then doing whatever you want to the code below. If you
// break it, the tests will catch it. Likewise, if you change this,
// MAKE SURE you write a test for your change, because its fairly impossible
// to reason about this mess.
//
// Functionally, what the code does below is get the libucl.Objects
// for all the TYPES, such as "aws_security_group".
for _, o1 := range os.Elem(false) {
// Iterate the inner to get the list of types
for _, o2 := range o1.Elem(true) {
// Iterate all of this type to get _all_ the types
for _, o3 := range o2.Elem(false) {
allTypes = append(allTypes, o3)
}
}
func loadResourcesHcl(list *ast.ObjectList) ([]*Resource, error) {
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
// Where all the results will go
@ -415,191 +404,179 @@ func loadResourcesHcl(os *hclobj.Object) ([]*Resource, error) {
// Now go over all the types and their children in order to get
// all of the actual resources.
for _, t := range allTypes {
for _, obj := range t.Elem(true) {
k := obj.Key
var config map[string]interface{}
if err := hcl.DecodeObject(&config, obj); err != nil {
return nil, fmt.Errorf(
"Error reading config for %s[%s]: %s",
t.Key,
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.Key,
k,
err)
}
// If we have a count, then figure it out
var count string = "1"
if o := obj.Get("count", false); o != nil {
err = hcl.DecodeObject(&count, o)
if err != nil {
return nil, fmt.Errorf(
"Error parsing count for %s[%s]: %s",
t.Key,
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 := obj.Get("depends_on", false); o != nil {
err := hcl.DecodeObject(&dependsOn, o)
if err != nil {
return nil, fmt.Errorf(
"Error reading depends_on for %s[%s]: %s",
t.Key,
k,
err)
}
}
// If we have connection info, then parse those out
var connInfo map[string]interface{}
if o := obj.Get("connection", false); o != nil {
err := hcl.DecodeObject(&connInfo, o)
if err != nil {
return nil, fmt.Errorf(
"Error reading connection info for %s[%s]: %s",
t.Key,
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.Key,
k,
err)
}
}
// If we have a provider, then parse it out
var provider string
if o := obj.Get("provider", false); o != nil {
err := hcl.DecodeObject(&provider, o)
if err != nil {
return nil, fmt.Errorf(
"Error reading provider for %s[%s]: %s",
t.Key,
k,
err)
}
}
// Check if the resource should be re-created before
// destroying the existing instance
var lifecycle ResourceLifecycle
if o := obj.Get("lifecycle", false); o != nil {
var raw map[string]interface{}
if err = hcl.DecodeObject(&raw, o); err != nil {
return nil, fmt.Errorf(
"Error parsing lifecycle for %s[%s]: %s",
t.Key,
k,
err)
}
if err := mapstructure.WeakDecode(raw, &lifecycle); err != nil {
return nil, fmt.Errorf(
"Error parsing lifecycle for %s[%s]: %s",
t.Key,
k,
err)
}
}
result = append(result, &Resource{
Name: k,
Type: t.Key,
RawCount: countConfig,
RawConfig: rawConfig,
Provisioners: provisioners,
Provider: provider,
DependsOn: dependsOn,
Lifecycle: lifecycle,
})
for _, item := range list.Items {
if len(item.Keys) != 2 {
// TODO: bad error message
return nil, fmt.Errorf("resource needs exactly 2 names")
}
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 {
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{
Name: k,
Type: t,
RawCount: countConfig,
RawConfig: rawConfig,
Provisioners: provisioners,
Provider: provider,
DependsOn: dependsOn,
Lifecycle: lifecycle,
})
}
return result, nil
}
func loadProvisionersHcl(os *hclobj.Object, connInfo map[string]interface{}) ([]*Provisioner, error) {
pos := make([]*hclobj.Object, 0, int(os.Len()))
// 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 _, o1 := range os.Elem(false) {
for _, o2 := range o1.Elem(true) {
switch o1.Type {
case hclobj.ValueTypeList:
for _, o3 := range o2.Elem(true) {
pos = append(pos, o3)
}
case hclobj.ValueTypeObject:
pos = append(pos, o2)
}
}
}
// Short-circuit if there are no items
if len(pos) == 0 {
func loadProvisionersHcl(list *ast.ObjectList, connInfo map[string]interface{}) ([]*Provisioner, error) {
println(fmt.Sprintf("%#v", list.Items[0]))
list = list.Children()
if len(list.Items) == 0 {
return nil, nil
}
result := make([]*Provisioner, 0, len(pos))
for _, po := range pos {
// 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, po); err != nil {
if err := hcl.DecodeObject(&config, item.Val); err != nil {
return nil, err
}
@ -614,8 +591,8 @@ func loadProvisionersHcl(os *hclobj.Object, connInfo map[string]interface{}) ([]
// Check if we have a provisioner-level connection
// block that overrides the resource-level
var subConnInfo map[string]interface{}
if o := po.Get("connection", false); o != nil {
err := hcl.DecodeObject(&subConnInfo, o)
if o := listVal.Filter("connection"); len(o.Items) > 0 {
err := hcl.DecodeObject(&subConnInfo, o.Items[0].Val)
if err != nil {
return nil, err
}
@ -640,7 +617,7 @@ func loadProvisionersHcl(os *hclobj.Object, connInfo map[string]interface{}) ([]
}
result = append(result, &Provisioner{
Type: po.Key,
Type: n,
RawConfig: rawConfig,
ConnInfo: connRaw,
})