67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// Copyright 2016 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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 convert
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import (
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"fmt"
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"github.com/containernetworking/cni/pkg/types"
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)
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type ResultFactoryFunc func([]byte) (types.Result, error)
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type creator struct {
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// CNI Result spec versions that createFn can create a Result for
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versions []string
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createFn ResultFactoryFunc
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}
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var creators []*creator
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func findCreator(version string) *creator {
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for _, c := range creators {
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for _, v := range c.versions {
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if v == version {
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return c
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}
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}
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}
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return nil
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}
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// Create creates a CNI Result using the given JSON, or an error if the creation
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// could not be performed
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func Create(version string, bytes []byte) (types.Result, error) {
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if c := findCreator(version); c != nil {
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return c.createFn(bytes)
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}
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return nil, fmt.Errorf("unsupported CNI result version %q", version)
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}
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// RegisterCreator registers a CNI Result creator. SHOULD NOT BE CALLED
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// EXCEPT FROM CNI ITSELF.
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func RegisterCreator(versions []string, createFn ResultFactoryFunc) {
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// Make sure there is no creator already registered for these versions
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for _, v := range versions {
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if findCreator(v) != nil {
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panic(fmt.Sprintf("creator already registered for %s", v))
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}
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}
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creators = append(creators, &creator{
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versions: versions,
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createFn: createFn,
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})
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}
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