DockerCLI/cli/command/context.go

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package command
import (
"encoding/json"
"errors"
"github.com/docker/cli/cli/context/store"
)
// DockerContext is a typed representation of what we put in Context metadata
type DockerContext struct {
Description string
AdditionalFields map[string]any
}
// MarshalJSON implements custom JSON marshalling
func (dc DockerContext) MarshalJSON() ([]byte, error) {
s := map[string]any{}
if dc.Description != "" {
s["Description"] = dc.Description
}
if dc.AdditionalFields != nil {
for k, v := range dc.AdditionalFields {
s[k] = v
}
}
return json.Marshal(s)
}
// UnmarshalJSON implements custom JSON marshalling
func (dc *DockerContext) UnmarshalJSON(payload []byte) error {
var data map[string]any
if err := json.Unmarshal(payload, &data); err != nil {
return err
}
for k, v := range data {
switch k {
case "Description":
dc.Description = v.(string)
default:
if dc.AdditionalFields == nil {
dc.AdditionalFields = make(map[string]any)
}
dc.AdditionalFields[k] = v
}
}
return nil
}
// GetDockerContext extracts metadata from stored context metadata
func GetDockerContext(storeMetadata store.Metadata) (DockerContext, error) {
if storeMetadata.Metadata == nil {
// can happen if we save endpoints before assigning a context metadata
// it is totally valid, and we should return a default initialized value
return DockerContext{}, nil
}
res, ok := storeMetadata.Metadata.(DockerContext)
if !ok {
return DockerContext{}, errors.New("context metadata is not a valid DockerContext")
}
if storeMetadata.Name == DefaultContextName {
res.Description = "Current DOCKER_HOST based configuration"
}
return res, nil
}