docker-compose/server/proxy/proxy.go

package proxy

import (
	"context"

	"github.com/docker/api/client"
)

type clientKey struct{}

// WithClient adds the client to the context
func WithClient(ctx context.Context, c *client.Client) (context.Context, error) {
	return context.WithValue(ctx, clientKey{}, c), nil
}

// Client returns the client from the context
func Client(ctx context.Context) *client.Client {
	c, _ := ctx.Value(clientKey{}).(*client.Client)
	return c
}