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Represent TerraformBackend.Config with cty.Value
* Add `Dict` struct to map string ket to `cty.Value` and handle YAML marshal/unmarshal;
* Use `Dict` instead of `map[string]interface{}` for `TerraformBackend.Config`.- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| // Copyright 2023 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package config | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
|
|
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| "github.com/zclconf/go-cty/cty" | ||
| "github.com/zclconf/go-cty/cty/gocty" | ||
| ctyJson "github.com/zclconf/go-cty/cty/json" | ||
| "gopkg.in/yaml.v3" | ||
| ) | ||
|
|
||
| // Dict maps string key to cty.Value. | ||
| // Zero Dict value is initialized (as oposed to nil map). | ||
| type Dict struct { | ||
| m map[string]cty.Value | ||
| } | ||
|
|
||
| // Get returns stored value or cty.NilVal. | ||
| func (d *Dict) Get(k string) cty.Value { | ||
| if d.m == nil { | ||
| return cty.NilVal | ||
| } | ||
| return d.m[k] | ||
| } | ||
|
|
||
| // Has tests if key is present in map. | ||
| func (d *Dict) Has(k string) bool { | ||
| if d.m == nil { | ||
| return false | ||
| } | ||
| _, ok := d.m[k] | ||
| return ok | ||
| } | ||
|
|
||
| // Set adds/overrides value by key. | ||
| // Returns refernce to Dict-self. | ||
| func (d *Dict) Set(k string, v cty.Value) *Dict { | ||
| if d.m == nil { | ||
| d.m = map[string]cty.Value{k: v} | ||
| } else { | ||
| d.m[k] = v | ||
| } | ||
| return d | ||
| } | ||
|
|
||
| // Items returns instance of map[sring]cty.Value | ||
| // will same set of key-value pairs as stored in Dict. | ||
| // This map is a copy, changes to returned map have no effect on the Dict. | ||
| func (d *Dict) Items() map[string]cty.Value { | ||
| m := map[string]cty.Value{} | ||
| if d.m != nil { | ||
| for k, v := range d.m { | ||
| m[k] = v | ||
| } | ||
| } | ||
| return m | ||
| } | ||
|
|
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| // yamlValue is wrapper around cty.Value to handle YAML unmarshal. | ||
| type yamlValue struct { | ||
| v cty.Value | ||
| } | ||
|
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| // UnmarshalYAML implements custom YAML unmarshaling. | ||
| func (y *yamlValue) UnmarshalYAML(n *yaml.Node) error { | ||
| var err error | ||
| switch n.Kind { | ||
| case yaml.ScalarNode: | ||
| err = y.unmarshalScalar(n) | ||
| case yaml.MappingNode: | ||
| err = y.unmarshalObject(n) | ||
| case yaml.SequenceNode: | ||
| err = y.unmarshalTuple(n) | ||
| default: | ||
| err = fmt.Errorf("line %d: cannot decode node with unknown kind %d", n.Line, n.Kind) | ||
| } | ||
| return err | ||
| } | ||
|
|
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| func (y *yamlValue) unmarshalScalar(n *yaml.Node) error { | ||
| var s interface{} | ||
| if err := n.Decode(&s); err != nil { | ||
| return err | ||
| } | ||
| ty, err := gocty.ImpliedType(s) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| y.v, err = gocty.ToCtyValue(s, ty) | ||
| return err | ||
| } | ||
|
|
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| func (y *yamlValue) unmarshalObject(n *yaml.Node) error { | ||
| var my map[string]yamlValue | ||
| if err := n.Decode(&my); err != nil { | ||
| return err | ||
| } | ||
| mv := map[string]cty.Value{} | ||
| for k, y := range my { | ||
| mv[k] = y.v | ||
| } | ||
| y.v = cty.ObjectVal(mv) | ||
| return nil | ||
| } | ||
|
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| func (y *yamlValue) unmarshalTuple(n *yaml.Node) error { | ||
| var ly []yamlValue | ||
| if err := n.Decode(&ly); err != nil { | ||
| return err | ||
| } | ||
| lv := []cty.Value{} | ||
| for _, y := range ly { | ||
| lv = append(lv, y.v) | ||
| } | ||
| y.v = cty.TupleVal(lv) | ||
| return nil | ||
| } | ||
|
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| // UnmarshalYAML implements custom YAML unmarshaling. | ||
| func (d *Dict) UnmarshalYAML(n *yaml.Node) error { | ||
| var m map[string]yamlValue | ||
| if err := n.Decode(&m); err != nil { | ||
| return err | ||
| } | ||
| for k, y := range m { | ||
| d.Set(k, y.v) | ||
| } | ||
| return nil | ||
| } | ||
|
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| // MarshalYAML implements custom YAML marshaling. | ||
| func (d Dict) MarshalYAML() (interface{}, error) { | ||
| mi := map[string]interface{}{} | ||
| for k, v := range d.Items() { | ||
| j := ctyJson.SimpleJSONValue{Value: v} | ||
| b, err := j.MarshalJSON() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to marshal JSON: %v", err) | ||
| } | ||
| var g interface{} | ||
| err = json.Unmarshal(b, &g) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to unmarshal JSON: %v", err) | ||
| } | ||
| mi[k] = g | ||
| } | ||
| return mi, nil | ||
| } |
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