terraform/command/jsonstate/state.go

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package jsonstate
import (
"encoding/json"
"fmt"
"github.com/zclconf/go-cty/cty"
ctyjson "github.com/zclconf/go-cty/cty/json"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/terraform"
)
// FormatVersion represents the version of the json format and will be
// incremented for any change to this format that requires changes to a
// consuming parser.
const FormatVersion = "0.1"
// state is the top-level representation of the json format of a terraform
// state.
type state struct {
FormatVersion string `json:"format_version,omitempty"`
Values stateValues `json:"values,omitempty"`
}
// stateValues is the common representation of resolved values for both the prior
// state (which is always complete) and the planned new state.
type stateValues struct {
Outputs map[string]output `json:"outputs,omitempty"`
RootModule module `json:"root_module,omitempty"`
}
type output struct {
Sensitive bool `json:"sensitive,omitempty"`
Value json.RawMessage `json:"value,omitempty"`
}
// module is the representation of a module in state. This can be the root module
// or a child module
type module struct {
Resources []resource `json:"resources,omitempty"`
// Address is the absolute module address, omitted for the root module
Address string `json:"address,omitempty"`
// Each module object can optionally have its own nested "child_modules",
// recursively describing the full module tree.
ChildModules []module `json:"child_modules,omitempty"`
}
// Resource is the representation of a resource in the state.
type resource struct {
// Address is the absolute resource address
Address string `json:"address,omitempty"`
// Mode can be "managed" or "data"
Mode string `json:"mode,omitempty"`
Type string `json:"type,omitempty"`
Name string `json:"name,omitempty"`
// Index is omitted for a resource not using `count` or `for_each`.
Index addrs.InstanceKey `json:"index,omitempty"`
// ProviderName allows the property "type" to be interpreted unambiguously
// in the unusual situation where a provider offers a resource type whose
// name does not start with its own name, such as the "googlebeta" provider
// offering "google_compute_instance".
ProviderName string `json:"provider_name"`
// SchemaVersion indicates which version of the resource type schema the
// "values" property conforms to.
SchemaVersion uint64 `json:"schema_version,omitempty"`
// AttributeValues is the JSON representation of the attribute values of the
// resource, whose structure depends on the resource type schema. Any
// unknown values are omitted or set to null, making them indistinguishable
// from absent values.
AttributeValues attributeValues `json:"values,omitempty"`
}
// attributeValues is the JSON representation of the attribute values of the
// resource, whose structure depends on the resource type schema.
type attributeValues map[string]interface{}
func marshalAttributeValues(value cty.Value, schema *configschema.Block) attributeValues {
ret := make(attributeValues)
it := value.ElementIterator()
for it.Next() {
k, v := it.Element()
ret[k.AsString()] = v
}
return ret
}
// newState() returns a minimally-initialized state
func newState() *state {
return &state{
FormatVersion: FormatVersion,
}
}
// Marshal returns the json encoding of a terraform plan.
func Marshal(s *states.State, schemas *terraform.Schemas) ([]byte, error) {
if s.Empty() {
return nil, nil
}
output := newState()
// output.StateValues
err := output.marshalStateValues(s, schemas)
if err != nil {
return nil, err
}
ret, err := json.Marshal(output)
return ret, err
}
func (jsonstate *state) marshalStateValues(s *states.State, schemas *terraform.Schemas) error {
var sv stateValues
var err error
// only marshal the root module outputs
sv.Outputs, err = marshalOutputs(s.RootModule().OutputValues)
if err != nil {
return err
}
// use the state and module map to build up the module structure
sv.RootModule, err = marshalRootModule(s, schemas)
if err != nil {
return err
}
jsonstate.Values = sv
return nil
}
func marshalOutputs(outputs map[string]*states.OutputValue) (map[string]output, error) {
if outputs == nil {
return nil, nil
}
ret := make(map[string]output)
for k, v := range outputs {
ov, err := ctyjson.Marshal(v.Value, v.Value.Type())
if err != nil {
return ret, err
}
ret[k] = output{
Value: ov,
Sensitive: v.Sensitive,
}
}
return ret, nil
}
func marshalRootModule(s *states.State, schemas *terraform.Schemas) (module, error) {
var ret module
var err error
ret.Address = ""
ret.Resources, err = marshalResources(s.RootModule().Resources, schemas)
if err != nil {
return ret, err
}
// build a map of module -> [child module addresses]
moduleMap := make(map[string][]addrs.ModuleInstance)
for _, mod := range s.Modules {
if mod.Addr.IsRoot() {
continue
} else {
parent := mod.Addr.Parent().String()
moduleMap[parent] = append(moduleMap[parent], mod.Addr)
}
}
// use the state and module map to build up the module structure
ret.ChildModules, err = marshalModules(s, schemas, moduleMap[""], moduleMap)
return ret, err
}
// marshalModules is an ungainly recursive function to build a module
// structure out of a teraform state.
func marshalModules(
s *states.State,
schemas *terraform.Schemas,
modules []addrs.ModuleInstance,
moduleMap map[string][]addrs.ModuleInstance,
) ([]module, error) {
var ret []module
for _, child := range modules {
stateMod := s.Module(child)
// cm for child module, naming things is hard.
cm := module{Address: stateMod.Addr.String()}
rs, err := marshalResources(stateMod.Resources, schemas)
if err != nil {
return nil, err
}
cm.Resources = rs
if moduleMap[child.String()] != nil {
moreChildModules, err := marshalModules(s, schemas, moduleMap[child.String()], moduleMap)
if err != nil {
return nil, err
}
cm.ChildModules = moreChildModules
}
ret = append(ret, cm)
}
return ret, nil
}
func marshalResources(resources map[string]*states.Resource, schemas *terraform.Schemas) ([]resource, error) {
var ret []resource
for _, r := range resources {
for k, ri := range r.Instances {
resource := resource{
Address: r.Addr.String(),
Type: r.Addr.Type,
Name: r.Addr.Name,
ProviderName: r.ProviderConfig.ProviderConfig.String(),
}
switch r.Addr.Mode {
case addrs.ManagedResourceMode:
resource.Mode = "managed"
case addrs.DataResourceMode:
resource.Mode = "data"
default:
return ret, fmt.Errorf("resource %s has an unsupported mode %s",
r.Addr.String(),
r.Addr.Mode.String(),
)
}
if r.EachMode != states.NoEach {
resource.Index = k
}
schema, _ := schemas.ResourceTypeConfig(
r.ProviderConfig.ProviderConfig.StringCompact(),
r.Addr.Mode,
r.Addr.Type,
)
resource.SchemaVersion = ri.Current.SchemaVersion
if schema == nil {
return nil, fmt.Errorf("no schema found for %s", r.Addr.String())
}
riObj, err := ri.Current.Decode(schema.ImpliedType())
if err != nil {
return nil, err
}
resource.AttributeValues = marshalAttributeValues(riObj.Value, schema)
ret = append(ret, resource)
}
}
return ret, nil
}