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taskvolume.go
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taskvolume.go
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// Copyright 2014-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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.
package api
import (
"encoding/json"
"errors"
"github.com/cihub/seelog"
)
// TaskVolume is a definition of all the volumes available for containers to
// reference within a task. It must be named.
type TaskVolume struct {
Name string `json:"name"`
Volume HostVolume
}
// UnmarshalJSON for TaskVolume determines the name and volume type, and
// unmarshals it into the appropriate HostVolume fulfilling interfaces
func (tv *TaskVolume) UnmarshalJSON(b []byte) error {
// Format: {name: volumeName, host: emptyVolumeOrHostVolume}
intermediate := make(map[string]json.RawMessage)
if err := json.Unmarshal(b, &intermediate); err != nil {
return err
}
name, ok := intermediate["name"]
if !ok {
return errors.New("invalid Volume; must include a name")
}
if err := json.Unmarshal(name, &tv.Name); err != nil {
return err
}
if rawhostdata, ok := intermediate["host"]; ok {
// Default to trying to unmarshal it as a FSHostVolume
var hostvolume FSHostVolume
err := json.Unmarshal(rawhostdata, &hostvolume)
if err != nil {
return err
}
if hostvolume.FSSourcePath == "" {
// If the FSSourcePath is empty, that must mean it was not an
// FSHostVolume (empty path is invalid for that type). The only other
// type is an empty volume, so unmarshal it as such.
emptyVolume := &EmptyHostVolume{}
json.Unmarshal(rawhostdata, emptyVolume)
tv.Volume = emptyVolume
} else {
tv.Volume = &hostvolume
}
return nil
}
return errors.New("unrecognized volume type; try updating me")
}
// MarshalJSON overrides the logic for JSON-encoding a TaskVolume object
func (tv *TaskVolume) MarshalJSON() ([]byte, error) {
result := make(map[string]interface{})
result["name"] = tv.Name
switch v := tv.Volume.(type) {
case *FSHostVolume:
result["host"] = v
case *EmptyHostVolume:
result["host"] = v
default:
seelog.Critical("Unknown task volume type in marshal")
}
return json.Marshal(result)
}