docker-compose/context/store/contextmetadata.go

package store

import "encoding/json"

// DockerContext represents the docker context metadata
type DockerContext struct {
	Name      string                 `json:",omitempty"`
	Metadata  ContextMetadata        `json:",omitempty"`
	Endpoints map[string]interface{} `json:",omitempty"`
}

// Type the context type
func (m *DockerContext) Type() string {
	if m.Metadata.Type == "" {
		return defaultContextType
	}
	return m.Metadata.Type
}

// ContextMetadata is represtentation of the data we put in a context
// metadata
type ContextMetadata struct {
	Type              string
	Description       string
	StackOrchestrator string
	AdditionalFields  map[string]interface{}
}

// AciContext is the context for the ACI backend
type AciContext struct {
	SubscriptionID string `json:",omitempty"`
	Location       string `json:",omitempty"`
	ResourceGroup  string `json:",omitempty"`
}

// MobyContext is the context for the moby backend
type MobyContext struct{}

// ExampleContext is the context for the example backend
type ExampleContext struct{}

// MarshalJSON implements custom JSON marshalling
func (dc ContextMetadata) MarshalJSON() ([]byte, error) {
	s := map[string]interface{}{}
	if dc.Description != "" {
		s["Description"] = dc.Description
	}
	if dc.StackOrchestrator != "" {
		s["StackOrchestrator"] = dc.StackOrchestrator
	}
	if dc.Type != "" {
		s["Type"] = dc.Type
	}
	if dc.AdditionalFields != nil {
		for k, v := range dc.AdditionalFields {
			s[k] = v
		}
	}
	return json.Marshal(s)
}

// UnmarshalJSON implements custom JSON marshalling
func (dc *ContextMetadata) UnmarshalJSON(payload []byte) error {
	var data map[string]interface{}
	if err := json.Unmarshal(payload, &data); err != nil {
		return err
	}
	for k, v := range data {
		switch k {
		case "Description":
			dc.Description = v.(string)
		case "StackOrchestrator":
			dc.StackOrchestrator = v.(string)
		case "Type":
			dc.Type = v.(string)
		default:
			if dc.AdditionalFields == nil {
				dc.AdditionalFields = make(map[string]interface{})
			}
			dc.AdditionalFields[k] = v
		}
	}
	return nil
}