db99092334
This change implements `mapper.Encode` "for real" (that is, in a way
that isn't a complete embarrassment). It uses the obvious reflection
trickery to encode a tagged struct and its values as a JSON-like
in-memory map and collection of keyed values.
During this, I took the opportunity to also clean up a few other things
that had been bugging me. Namely, the presence of `mapper.Object` was
always error prone, since it isn't a true "typedef" in the sence that
it carries extra RTTI. Instead of doing that, let's just use the real
`map[string]interface{}` "JSON-map-like" object type. Even better, we
no longer require resource providers to deal with the mapper
infrastructure. Instead, the `Check` function can simply return an
array of errors. It's still best practice to return field-specific errors
to facilitate better diagnostics, but it's no longer required; and I've
added `resource.NewFieldError` to eliminate the need to import mapper.
As of this change, we can also consistently emit RPC structs with `lumi`
tags, rather than `lumi` tags on the way in and `json` on the way out.
This completes pulumi/lumi#183.
62 lines
2.6 KiB
Go
62 lines
2.6 KiB
Go
// Licensed to Pulumi Corporation ("Pulumi") under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// Pulumi licenses this file to You under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mapper
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import (
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"reflect"
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)
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// AsObject attempts to coerce an existing value to an object map, returning a non-nil error if it cannot be done.
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func AsObject(v interface{}, ty reflect.Type, key string) (map[string]interface{}, FieldError) {
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if vmap, ok := v.(map[string]interface{}); ok {
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return vmap, nil
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}
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return nil, NewWrongTypeError(
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ty, key, reflect.TypeOf(make(map[string]interface{})), reflect.TypeOf(v))
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}
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// AsString attempts to coerce an existing value to a string, returning a non-nil error if it cannot be done.
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func AsString(v interface{}, ty reflect.Type, key string) (*string, FieldError) {
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if s, ok := v.(string); ok {
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return &s, nil
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}
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return nil, NewWrongTypeError(ty, key, reflect.TypeOf(""), reflect.TypeOf(v))
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}
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// FieldObject looks up a field by name within an object map, coerces it to an object itself, and returns it. If the
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// field exists but is not an object map, or it is missing and optional is false, a non-nil error is returned.
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func FieldObject(obj map[string]interface{}, ty reflect.Type,
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key string, optional bool) (map[string]interface{}, FieldError) {
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if o, has := obj[key]; has {
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return AsObject(o, ty, key)
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} else if !optional {
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// The field doesn't exist and yet it is required; issue an error.
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return nil, NewMissingError(ty, key)
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}
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return nil, nil
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}
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// FieldString looks up a field by name within an object map, coerces it to a string, and returns it. If the
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// field exists but is not a string, or it is missing and optional is false, a non-nil error is returned.
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func FieldString(obj map[string]interface{}, ty reflect.Type, key string, optional bool) (*string, FieldError) {
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if s, has := obj[key]; has {
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return AsString(s, ty, key)
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} else if !optional {
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// The field doesn't exist and yet it is required; issue an error.
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return nil, NewMissingError(ty, key)
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}
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return nil, nil
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}
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