drone-yaml/yaml/manifest.go

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// Copyright 2019 Drone IO, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package yaml
import (
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"bytes"
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"encoding/json"
"errors"
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"gopkg.in/yaml.v2"
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)
// Resource enums.
const (
KindCron = "cron"
KindPipeline = "pipeline"
KindRegistry = "registry"
KindSecret = "secret"
KindSignature = "signature"
)
type (
// Manifest is a collection of Drone resources.
Manifest struct {
Resources []Resource
}
// Resource represents a Drone resource.
Resource interface {
// GetVersion returns the resource version.
GetVersion() string
// GetKind returns the resource kind.
GetKind() string
}
// RawResource is a raw encoded resource with the
// resource kind and type extracted.
RawResource struct {
Version string
Kind string
Type string
Data []byte `yaml:"-"`
}
resource struct {
Version string
Kind string `json:"kind"`
Type string `json:"type"`
}
)
// UnmarshalJSON implement the json.Unmarshaler.
func (m *Manifest) UnmarshalJSON(b []byte) error {
messages := []json.RawMessage{}
err := json.Unmarshal(b, &messages)
if err != nil {
return err
}
for _, message := range messages {
res := new(resource)
err := json.Unmarshal(message, res)
if err != nil {
return err
}
var obj Resource
switch res.Kind {
case "cron":
obj = new(Cron)
case "secret":
obj = new(Secret)
case "signature":
obj = new(Signature)
case "registry":
obj = new(Registry)
default:
obj = new(Pipeline)
}
err = json.Unmarshal(message, obj)
if err != nil {
return err
}
m.Resources = append(m.Resources, obj)
}
return nil
}
// MarshalJSON implement the json.Marshaler.
func (m *Manifest) MarshalJSON() ([]byte, error) {
return json.Marshal(m.Resources)
}
// MarshalYAML is not implemented and returns an error. This is
// because the Manifest is a representation of multiple yaml
// documents, and MarshalYAML would otherwise attempt to marshal
// as a single Yaml document. Use the Encode method instead.
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func (m *Manifest) MarshalYAML() (interface{}, error) {
return nil, errors.New("yaml: marshal not implemented")
}
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// Encode encodes the manifest in Yaml format.
func (m *Manifest) Encode() ([]byte, error) {
buf := new(bytes.Buffer)
enc := yaml.NewEncoder(buf)
for _, res := range m.Resources {
if err := enc.Encode(res); err != nil {
return nil, err
}
}
return buf.Bytes(), nil
}