// 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 {
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{}
if err := hcl.DecodeObject(&config, o); err != nil {
return nil, err
}
delete(config, "alias")
rawConfig, err := NewRawConfig(config)
if err != nil {
return nil, fmt.Errorf(
"Error reading config for provider config %s: %s",
o.Key,
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 err != nil {
return nil, fmt.Errorf(
"Error reading alias for provider[%s]: %s",
o.Key,
err)
}
}
result = append(result, &ProviderConfig{
Name: o.Key,
Alias: alias,
RawConfig: rawConfig,
})
}
return result, nil
}
// Given a handle to a HCL object, this transforms it into the Atlas
// configuration.
func loadAtlasHcl(obj *hclobj.Object) (*AtlasConfig, error) {
var config AtlasConfig
if err := hcl.DecodeObject(&config, obj); err != nil {
return nil, fmt.Errorf(
"Error reading atlas config: %s",
err)
}
return &config, nil
}
// 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 {
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.DecodeObject(&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
}
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 {
return nil, nil
}
result := make([]*Provisioner, 0, len(pos))
for _, po := range pos {
var config map[string]interface{}
if err := hcl.DecodeObject(&config, po); 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 o := po.Get("connection", false); o != nil {
err := hcl.DecodeObject(&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
}
// 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(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)
}
}
}
// 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 := 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 {
err = hcl.DecodeObject(&lifecycle, o)
if 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,
})
}
}
return result, 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(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)
}
}
}
// 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 _, obj := range allNames {
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",
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 := obj.Get("source", false); o != nil {
err = hcl.DecodeObject(&source, o)
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
}
func (t *hclConfigurable) Config() (*Config, error) {
validKeys := map[string]struct{}{
"atlas": struct{}{},
"module": 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.DecodeObject(&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)
}
}
// Get Atlas configuration
if atlas := t.Object.Get("atlas", false); atlas != nil {
var err error
config.Atlas, err = loadAtlasHcl(atlas)
if err != nil {
return nil, err
}
}
// Build the modules
if modules := t.Object.Get("module", false); modules != nil {
var err error
config.Modules, err = loadModulesHcl(modules)
if err != nil {
return nil, err
}
}
// 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(true) {
k := elem.Key
if _, ok := validKeys[k]; ok {
continue
}
config.unknownKeys = append(config.unknownKeys, k)
}
return config, nil
}
