mirror of https://github.com/pulumi/pulumi.git
126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
// Copyright 2016-2017, Pulumi Corporation. All rights reserved.
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package mapper
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import (
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"reflect"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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// Encode encodes a strongly typed struct into a weakly typed JSON-like property bag.
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func (md *mapper) Encode(source interface{}) (map[string]interface{}, MappingError) {
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// Fetch the type and value; if it's a pointer, do a quick nil check, otherwise operate on its underlying type.
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vsrc := reflect.ValueOf(source)
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vsrcType := vsrc.Type()
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if vsrcType.Kind() == reflect.Ptr {
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if vsrc.IsNil() {
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return nil, nil
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}
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vsrc = vsrc.Elem()
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vsrcType = vsrc.Type()
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}
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contract.Assertf(vsrcType.Kind() == reflect.Struct,
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"Source %v must be a struct type with `pulumi:\"x\"` tags to direct encoding (kind %v)",
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vsrcType, vsrcType.Kind())
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// Fetch the source type, allocate a fresh object, and start encoding into it.
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var errs []error
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obj := make(map[string]interface{})
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for _, fldtag := range md.structFieldsTags(vsrc.Type()) {
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if !fldtag.Skip {
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key := fldtag.Key
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fld := vsrc.FieldByName(fldtag.Info.Name)
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v, err := md.EncodeValue(fld.Interface())
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if err != nil {
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errs = append(errs, err.Failures()...)
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} else if v == nil {
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if !fldtag.Optional && !md.opts.IgnoreMissing {
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// The field doesn't exist and yet it is required; issue an error.
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errs = append(errs, NewMissingError(vsrcType, key))
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}
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} else {
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obj[key] = v
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}
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}
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}
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// If there are no errors, return nil; else manufacture a decode error object.
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var err MappingError
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if len(errs) > 0 {
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err = NewMappingError(errs)
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}
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return obj, err
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}
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// EncodeValue decodes primitive type fields. For fields of complex types, we use custom deserialization.
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func (md *mapper) EncodeValue(v interface{}) (interface{}, MappingError) {
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vsrc := reflect.ValueOf(v)
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contract.Assert(vsrc.IsValid())
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// Otherwise, try to map to the closest JSON-like destination type we can.
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switch k := vsrc.Kind(); k {
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// Primitive types:
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case reflect.Bool:
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return vsrc.Bool(), nil
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return float64(vsrc.Int()), nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return float64(vsrc.Uint()), nil
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case reflect.Float32, reflect.Float64:
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return vsrc.Float(), nil
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case reflect.String:
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return vsrc.String(), nil
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// Pointers:
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case reflect.Ptr:
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if vsrc.IsNil() {
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return nil, nil
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}
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return md.EncodeValue(vsrc.Elem().Interface())
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// Slices and maps:
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case reflect.Slice:
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var slice []interface{}
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var errs []error
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for i := 0; i < vsrc.Len(); i++ {
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ev := vsrc.Index(i).Interface()
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if elem, err := md.EncodeValue(ev); err != nil {
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errs = append(errs, err.Failures()...)
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} else {
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slice = append(slice, elem)
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}
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}
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if errs == nil {
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return slice, nil
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}
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return nil, NewMappingError(errs)
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case reflect.Map:
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keys := vsrc.MapKeys()
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mmap := make(map[string]interface{})
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var errs []error
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for _, key := range keys {
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contract.Assert(key.Kind() == reflect.String)
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if val, err := md.EncodeValue(vsrc.MapIndex(key).Interface()); err != nil {
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errs = append(errs, err.Failures()...)
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} else {
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mmap[key.String()] = val
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}
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}
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if errs == nil {
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return mmap, nil
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}
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return nil, NewMappingError(errs)
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// Structs and interface{}:
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case reflect.Struct:
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return md.Encode(vsrc.Interface())
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case reflect.Interface:
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return md.EncodeValue(vsrc.Elem().Interface())
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default:
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contract.Failf("Unrecognized field type '%v' during encoding", k)
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}
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return nil, nil
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}
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