42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package structs
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import (
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"reflect"
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"github.com/hashicorp/go-msgpack/codec"
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)
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// extendFunc is a mapping from one struct to another, to change the shape of the encoded JSON
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type extendFunc func(interface{}) interface{}
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// nomadJsonEncodingExtensions is a catch-all go-msgpack extension
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// it looks up the types in the list of registered extension functions and applies it
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type nomadJsonEncodingExtensions struct{}
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// ConvertExt calls the registered conversions functions
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func (n nomadJsonEncodingExtensions) ConvertExt(v interface{}) interface{} {
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if fn, ok := extendedTypes[reflect.TypeOf(v)]; ok {
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return fn(v)
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} else {
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// shouldn't get here, but returning v will probably result in an infinite loop
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// return nil and erase this field
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return nil
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}
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}
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// UpdateExt is required by go-msgpack, but not used by us
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func (n nomadJsonEncodingExtensions) UpdateExt(_ interface{}, _ interface{}) {}
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// NomadJsonEncodingExtensions registers all extension functions against the
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// provided JsonHandle.
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// It should be called on any JsonHandle which is used by the API HTTP server.
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func NomadJsonEncodingExtensions(h *codec.JsonHandle) *codec.JsonHandle {
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for tpe := range extendedTypes {
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h.SetInterfaceExt(tpe, 1, nomadJsonEncodingExtensions{})
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}
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return h
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}
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