package schema import ( "fmt" "strconv" "strings" "sync" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/mapstructure" ) // ConfigFieldReader reads fields out of an untyped map[string]string to the // best of its ability. It also applies defaults from the Schema. (The other // field readers do not need default handling because they source fully // populated data structures.) type ConfigFieldReader struct { Config *terraform.ResourceConfig Schema map[string]*Schema indexMaps map[string]map[string]int once sync.Once } func (r *ConfigFieldReader) ReadField(address []string) (FieldReadResult, error) { r.once.Do(func() { r.indexMaps = make(map[string]map[string]int) }) return r.readField(address, false) } func (r *ConfigFieldReader) readField( address []string, nested bool) (FieldReadResult, error) { schemaList := addrToSchema(address, r.Schema) if len(schemaList) == 0 { return FieldReadResult{}, nil } if !nested { // If we have a set anywhere in the address, then we need to // read that set out in order and actually replace that part of // the address with the real list index. i.e. set.50 might actually // map to set.12 in the config, since it is in list order in the // config, not indexed by set value. for i, v := range schemaList { // Sets are the only thing that cause this issue. if v.Type != TypeSet { continue } // If we're at the end of the list, then we don't have to worry // about this because we're just requesting the whole set. if i == len(schemaList)-1 { continue } // If we're looking for the count, then ignore... if address[i+1] == "#" { continue } indexMap, ok := r.indexMaps[strings.Join(address[:i+1], ".")] if !ok { // Get the set so we can get the index map that tells us the // mapping of the hash code to the list index _, err := r.readSet(address[:i+1], v) if err != nil { return FieldReadResult{}, err } indexMap = r.indexMaps[strings.Join(address[:i+1], ".")] } index, ok := indexMap[address[i+1]] if !ok { return FieldReadResult{}, nil } address[i+1] = strconv.FormatInt(int64(index), 10) } } k := strings.Join(address, ".") schema := schemaList[len(schemaList)-1] // If we're getting the single element of a promoted list, then // check to see if we have a single element we need to promote. if address[len(address)-1] == "0" && len(schemaList) > 1 { lastSchema := schemaList[len(schemaList)-2] if lastSchema.Type == TypeList && lastSchema.PromoteSingle { k := strings.Join(address[:len(address)-1], ".") result, err := r.readPrimitive(k, schema) if err == nil { return result, nil } } } switch schema.Type { case TypeBool, TypeFloat, TypeInt, TypeString: return r.readPrimitive(k, schema) case TypeList: // If we support promotion then we first check if we have a lone // value that we must promote. // a value that is alone. if schema.PromoteSingle { result, err := r.readPrimitive(k, schema.Elem.(*Schema)) if err == nil && result.Exists { result.Value = []interface{}{result.Value} return result, nil } } return readListField(&nestedConfigFieldReader{r}, address, schema) case TypeMap: return r.readMap(k, schema) case TypeSet: return r.readSet(address, schema) case typeObject: return readObjectField( &nestedConfigFieldReader{r}, address, schema.Elem.(map[string]*Schema)) default: panic(fmt.Sprintf("Unknown type: %s", schema.Type)) } } func (r *ConfigFieldReader) readMap(k string, schema *Schema) (FieldReadResult, error) { // We want both the raw value and the interpolated. We use the interpolated // to store actual values and we use the raw one to check for // computed keys. Actual values are obtained in the switch, depending on // the type of the raw value. mraw, ok := r.Config.GetRaw(k) if !ok { // check if this is from an interpolated field by seeing if it exists // in the config _, ok := r.Config.Get(k) if !ok { // this really doesn't exist return FieldReadResult{}, nil } // We couldn't fetch the value from a nested data structure, so treat the // raw value as an interpolation string. The mraw value is only used // for the type switch below. mraw = "${INTERPOLATED}" } result := make(map[string]interface{}) computed := false switch m := mraw.(type) { case string: // This is a map which has come out of an interpolated variable, so we // can just get the value directly from config. Values cannot be computed // currently. v, _ := r.Config.Get(k) // If this isn't a map[string]interface, it must be computed. mapV, ok := v.(map[string]interface{}) if !ok { return FieldReadResult{ Exists: true, Computed: true, }, nil } // Otherwise we can proceed as usual. for i, iv := range mapV { result[i] = iv } case []interface{}: for i, innerRaw := range m { for ik := range innerRaw.(map[string]interface{}) { key := fmt.Sprintf("%s.%d.%s", k, i, ik) if r.Config.IsComputed(key) { computed = true break } v, _ := r.Config.Get(key) result[ik] = v } } case []map[string]interface{}: for i, innerRaw := range m { for ik := range innerRaw { key := fmt.Sprintf("%s.%d.%s", k, i, ik) if r.Config.IsComputed(key) { computed = true break } v, _ := r.Config.Get(key) result[ik] = v } } case map[string]interface{}: for ik := range m { key := fmt.Sprintf("%s.%s", k, ik) if r.Config.IsComputed(key) { computed = true break } v, _ := r.Config.Get(key) result[ik] = v } default: panic(fmt.Sprintf("unknown type: %#v", mraw)) } err := mapValuesToPrimitive(k, result, schema) if err != nil { return FieldReadResult{}, nil } var value interface{} if !computed { value = result } return FieldReadResult{ Value: value, Exists: true, Computed: computed, }, nil } func (r *ConfigFieldReader) readPrimitive( k string, schema *Schema) (FieldReadResult, error) { raw, ok := r.Config.Get(k) if !ok { // Nothing in config, but we might still have a default from the schema var err error raw, err = schema.DefaultValue() if err != nil { return FieldReadResult{}, fmt.Errorf("%s, error loading default: %s", k, err) } if raw == nil { return FieldReadResult{}, nil } } var result string if err := mapstructure.WeakDecode(raw, &result); err != nil { return FieldReadResult{}, err } computed := r.Config.IsComputed(k) returnVal, err := stringToPrimitive(result, computed, schema) if err != nil { return FieldReadResult{}, err } return FieldReadResult{ Value: returnVal, Exists: true, Computed: computed, }, nil } func (r *ConfigFieldReader) readSet( address []string, schema *Schema) (FieldReadResult, error) { indexMap := make(map[string]int) // Create the set that will be our result set := schema.ZeroValue().(*Set) raw, err := readListField(&nestedConfigFieldReader{r}, address, schema) if err != nil { return FieldReadResult{}, err } if !raw.Exists { return FieldReadResult{Value: set}, nil } // If the list is computed, the set is necessarilly computed if raw.Computed { return FieldReadResult{ Value: set, Exists: true, Computed: raw.Computed, }, nil } // Build up the set from the list elements for i, v := range raw.Value.([]interface{}) { // Check if any of the keys in this item are computed computed := r.hasComputedSubKeys( fmt.Sprintf("%s.%d", strings.Join(address, "."), i), schema) code := set.add(v, computed) indexMap[code] = i } r.indexMaps[strings.Join(address, ".")] = indexMap return FieldReadResult{ Value: set, Exists: true, }, nil } // hasComputedSubKeys walks through a schema and returns whether or not the // given key contains any subkeys that are computed. func (r *ConfigFieldReader) hasComputedSubKeys(key string, schema *Schema) bool { prefix := key + "." switch t := schema.Elem.(type) { case *Resource: for k, schema := range t.Schema { if r.Config.IsComputed(prefix + k) { return true } if r.hasComputedSubKeys(prefix+k, schema) { return true } } } return false } // nestedConfigFieldReader is a funny little thing that just wraps a // ConfigFieldReader to call readField when ReadField is called so that // we don't recalculate the set rewrites in the address, which leads to // an infinite loop. type nestedConfigFieldReader struct { Reader *ConfigFieldReader } func (r *nestedConfigFieldReader) ReadField( address []string) (FieldReadResult, error) { return r.Reader.readField(address, true) }