package jsonplan import ( "encoding/json" "fmt" "sort" "github.com/zclconf/go-cty/cty" ctyjson "github.com/zclconf/go-cty/cty/json" "github.com/hashicorp/terraform/addrs" "github.com/hashicorp/terraform/command/jsonconfig" "github.com/hashicorp/terraform/command/jsonstate" "github.com/hashicorp/terraform/configs" "github.com/hashicorp/terraform/plans" "github.com/hashicorp/terraform/states" "github.com/hashicorp/terraform/states/statefile" "github.com/hashicorp/terraform/terraform" "github.com/hashicorp/terraform/version" ) // 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" // Plan is the top-level representation of the json format of a plan. It includes // the complete config and current state. type plan struct { FormatVersion string `json:"format_version,omitempty"` TerraformVersion string `json:"terraform_version,omitempty"` Variables variables `json:"variables,omitempty"` PlannedValues stateValues `json:"planned_values,omitempty"` // ResourceChanges are sorted in a user-friendly order that is undefined at // this time, but consistent. ResourceChanges []resourceChange `json:"resource_changes,omitempty"` OutputChanges map[string]change `json:"output_changes,omitempty"` PriorState json.RawMessage `json:"prior_state,omitempty"` Config json.RawMessage `json:"configuration,omitempty"` } func newPlan() *plan { return &plan{ FormatVersion: FormatVersion, } } // Change is the representation of a proposed change for an object. type change struct { // Actions are the actions that will be taken on the object selected by the // properties below. Valid actions values are: // ["no-op"] // ["create"] // ["read"] // ["update"] // ["delete", "create"] // ["create", "delete"] // ["delete"] // The two "replace" actions are represented in this way to allow callers to // e.g. just scan the list for "delete" to recognize all three situations // where the object will be deleted, allowing for any new deletion // combinations that might be added in future. Actions []string `json:"actions,omitempty"` // Before and After are representations of the object value both before and // after the action. For ["create"] and ["delete"] actions, either "before" // or "after" is unset (respectively). For ["no-op"], the before and after // values are identical. The "after" value will be incomplete if there are // values within it that won't be known until after apply. Before json.RawMessage `json:"before,omitempty"` After json.RawMessage `json:"after,omitempty"` AfterUnknown json.RawMessage `json:"after_unknown,omitempty"` } type output struct { Sensitive bool `json:"sensitive"` Value json.RawMessage `json:"value,omitempty"` } // variables is the JSON representation of the variables provided to the current // plan. type variables map[string]*variable type variable struct { Value json.RawMessage `json:"value,omitempty"` } // Marshal returns the json encoding of a terraform plan. func Marshal( config *configs.Config, p *plans.Plan, sf *statefile.File, schemas *terraform.Schemas, ) ([]byte, error) { output := newPlan() output.TerraformVersion = version.String() err := output.marshalPlanVariables(p.VariableValues, schemas) if err != nil { return nil, fmt.Errorf("error in marshalPlanVariables: %s", err) } // output.PlannedValues err = output.marshalPlannedValues(p.Changes, schemas) if err != nil { return nil, fmt.Errorf("error in marshalPlannedValues: %s", err) } // output.ResourceChanges err = output.marshalResourceChanges(p.Changes, schemas) if err != nil { return nil, fmt.Errorf("error in marshalResourceChanges: %s", err) } // output.OutputChanges err = output.marshalOutputChanges(p.Changes) if err != nil { return nil, fmt.Errorf("error in marshaling output changes: %s", err) } // output.PriorState if sf != nil && !sf.State.Empty() { output.PriorState, err = jsonstate.Marshal(sf, schemas) if err != nil { return nil, fmt.Errorf("error marshaling prior state: %s", err) } } // output.Config output.Config, err = jsonconfig.Marshal(config, schemas) if err != nil { return nil, fmt.Errorf("error marshaling config: %s", err) } ret, err := json.Marshal(output) return ret, err } func (p *plan) marshalPlanVariables(vars map[string]plans.DynamicValue, schemas *terraform.Schemas) error { if len(vars) == 0 { return nil } p.Variables = make(variables, len(vars)) for k, v := range vars { val, err := v.Decode(cty.DynamicPseudoType) if err != nil { return err } valJSON, err := ctyjson.Marshal(val, val.Type()) if err != nil { return err } p.Variables[k] = &variable{ Value: valJSON, } } return nil } func (p *plan) marshalResourceChanges(changes *plans.Changes, schemas *terraform.Schemas) error { if changes == nil { // Nothing to do! return nil } for _, rc := range changes.Resources { var r resourceChange addr := rc.Addr r.Address = addr.String() dataSource := addr.Resource.Resource.Mode == addrs.DataResourceMode // We create "delete" actions for data resources so we can clean up // their entries in state, but this is an implementation detail that // users shouldn't see. if dataSource && rc.Action == plans.Delete { continue } schema, _ := schemas.ResourceTypeConfig( rc.ProviderAddr.Provider, addr.Resource.Resource.Mode, addr.Resource.Resource.Type, ) if schema == nil { return fmt.Errorf("no schema found for %s", r.Address) } changeV, err := rc.Decode(schema.ImpliedType()) if err != nil { return err } var before, after []byte var afterUnknown cty.Value if changeV.Before != cty.NilVal { before, err = ctyjson.Marshal(changeV.Before, changeV.Before.Type()) if err != nil { return err } } if changeV.After != cty.NilVal { if changeV.After.IsWhollyKnown() { after, err = ctyjson.Marshal(changeV.After, changeV.After.Type()) if err != nil { return err } afterUnknown = cty.EmptyObjectVal } else { filteredAfter := omitUnknowns(changeV.After) if filteredAfter.IsNull() { after = nil } else { after, err = ctyjson.Marshal(filteredAfter, filteredAfter.Type()) if err != nil { return err } } afterUnknown = unknownAsBool(changeV.After) } } a, err := ctyjson.Marshal(afterUnknown, afterUnknown.Type()) if err != nil { return err } r.Change = change{ Actions: actionString(rc.Action.String()), Before: json.RawMessage(before), After: json.RawMessage(after), AfterUnknown: a, } if rc.DeposedKey != states.NotDeposed { r.Deposed = rc.DeposedKey.String() } key := addr.Resource.Key if key != nil { r.Index = key } switch addr.Resource.Resource.Mode { case addrs.ManagedResourceMode: r.Mode = "managed" case addrs.DataResourceMode: r.Mode = "data" default: return fmt.Errorf("resource %s has an unsupported mode %s", r.Address, addr.Resource.Resource.Mode.String()) } r.ModuleAddress = addr.Module.String() r.Name = addr.Resource.Resource.Name r.Type = addr.Resource.Resource.Type r.ProviderName = rc.ProviderAddr.Provider.LegacyString() p.ResourceChanges = append(p.ResourceChanges, r) } sort.Slice(p.ResourceChanges, func(i, j int) bool { return p.ResourceChanges[i].Address < p.ResourceChanges[j].Address }) return nil } func (p *plan) marshalOutputChanges(changes *plans.Changes) error { if changes == nil { // Nothing to do! return nil } p.OutputChanges = make(map[string]change, len(changes.Outputs)) for _, oc := range changes.Outputs { changeV, err := oc.Decode() if err != nil { return err } var before, after []byte afterUnknown := cty.False if changeV.Before != cty.NilVal { before, err = ctyjson.Marshal(changeV.Before, changeV.Before.Type()) if err != nil { return err } } if changeV.After != cty.NilVal { if changeV.After.IsWhollyKnown() { after, err = ctyjson.Marshal(changeV.After, changeV.After.Type()) if err != nil { return err } } else { afterUnknown = cty.True } } a, _ := ctyjson.Marshal(afterUnknown, afterUnknown.Type()) c := change{ Actions: actionString(oc.Action.String()), Before: json.RawMessage(before), After: json.RawMessage(after), AfterUnknown: a, } p.OutputChanges[oc.Addr.OutputValue.Name] = c } return nil } func (p *plan) marshalPlannedValues(changes *plans.Changes, schemas *terraform.Schemas) error { // marshal the planned changes into a module plan, err := marshalPlannedValues(changes, schemas) if err != nil { return err } p.PlannedValues.RootModule = plan // marshalPlannedOutputs outputs, err := marshalPlannedOutputs(changes) if err != nil { return err } p.PlannedValues.Outputs = outputs return nil } // omitUnknowns recursively walks the src cty.Value and returns a new cty.Value, // omitting any unknowns. // // The result also normalizes some types: all sequence types are turned into // tuple types and all mapping types are converted to object types, since we // assume the result of this is just going to be serialized as JSON (and thus // lose those distinctions) anyway. func omitUnknowns(val cty.Value) cty.Value { ty := val.Type() switch { case val.IsNull(): return val case !val.IsKnown(): return cty.NilVal case ty.IsPrimitiveType(): return val case ty.IsListType() || ty.IsTupleType() || ty.IsSetType(): var vals []cty.Value it := val.ElementIterator() for it.Next() { _, v := it.Element() newVal := omitUnknowns(v) if newVal != cty.NilVal { vals = append(vals, newVal) } else if newVal == cty.NilVal && ty.IsListType() { // list length may be significant, so we will turn unknowns into nulls vals = append(vals, cty.NullVal(v.Type())) } } // We use tuple types always here, because the work we did above // may have caused the individual elements to have different types, // and we're doing this work to produce JSON anyway and JSON marshalling // represents all of these sequence types as an array. return cty.TupleVal(vals) case ty.IsMapType() || ty.IsObjectType(): vals := make(map[string]cty.Value) it := val.ElementIterator() for it.Next() { k, v := it.Element() newVal := omitUnknowns(v) if newVal != cty.NilVal { vals[k.AsString()] = newVal } } // We use object types always here, because the work we did above // may have caused the individual elements to have different types, // and we're doing this work to produce JSON anyway and JSON marshalling // represents both of these mapping types as an object. return cty.ObjectVal(vals) default: // Should never happen, since the above should cover all types panic(fmt.Sprintf("omitUnknowns cannot handle %#v", val)) } } // recursively iterate through a cty.Value, replacing unknown values (including // null) with cty.True and known values with cty.False. // // The result also normalizes some types: all sequence types are turned into // tuple types and all mapping types are converted to object types, since we // assume the result of this is just going to be serialized as JSON (and thus // lose those distinctions) anyway. func unknownAsBool(val cty.Value) cty.Value { ty := val.Type() switch { case val.IsNull(): return cty.False case !val.IsKnown(): if ty.IsPrimitiveType() || ty.Equals(cty.DynamicPseudoType) { return cty.True } fallthrough case ty.IsPrimitiveType(): return cty.BoolVal(!val.IsKnown()) case ty.IsListType() || ty.IsTupleType() || ty.IsSetType(): length := val.LengthInt() if length == 0 { // If there are no elements then we can't have unknowns return cty.EmptyTupleVal } vals := make([]cty.Value, 0, length) it := val.ElementIterator() for it.Next() { _, v := it.Element() vals = append(vals, unknownAsBool(v)) } // The above transform may have changed the types of some of the // elements, so we'll always use a tuple here in case we've now made // different elements have different types. Our ultimate goal is to // marshal to JSON anyway, and all of these sequence types are // indistinguishable in JSON. return cty.TupleVal(vals) case ty.IsMapType() || ty.IsObjectType(): var length int switch { case ty.IsMapType(): length = val.LengthInt() default: length = len(val.Type().AttributeTypes()) } if length == 0 { // If there are no elements then we can't have unknowns return cty.EmptyObjectVal } vals := make(map[string]cty.Value) it := val.ElementIterator() for it.Next() { k, v := it.Element() vAsBool := unknownAsBool(v) if !vAsBool.RawEquals(cty.False) { // all of the "false"s for known values for more compact serialization vals[k.AsString()] = unknownAsBool(v) } } // The above transform may have changed the types of some of the // elements, so we'll always use an object here in case we've now made // different elements have different types. Our ultimate goal is to // marshal to JSON anyway, and all of these mapping types are // indistinguishable in JSON. return cty.ObjectVal(vals) default: // Should never happen, since the above should cover all types panic(fmt.Sprintf("unknownAsBool cannot handle %#v", val)) } } func actionString(action string) []string { switch { case action == "NoOp": return []string{"no-op"} case action == "Create": return []string{"create"} case action == "Delete": return []string{"delete"} case action == "Update": return []string{"update"} case action == "CreateThenDelete": return []string{"create", "delete"} case action == "Read": return []string{"read"} case action == "DeleteThenCreate": return []string{"delete", "create"} default: return []string{action} } }