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client.go
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client.go
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package dockergc
import (
"context"
"time"
dockerapi "github.com/docker/engine-api/client"
dockertypes "github.com/docker/engine-api/types"
)
type dockerClient struct {
// timeout is the timeout of short running docker operations.
timeout time.Duration
// docker API client
client *dockerapi.Client
}
func newDockerClient(timeout time.Duration) (*dockerClient, error) {
client, err := dockerapi.NewEnvClient()
if err != nil {
return nil, err
}
return &dockerClient{
client: client,
timeout: timeout,
}, nil
}
func clientErr(ctx context.Context, err error) error {
if ctx.Err() != nil {
return ctx.Err()
}
return err
}
func (c *dockerClient) getTimeoutContext() (context.Context, context.CancelFunc) {
return context.WithTimeout(context.Background(), c.timeout)
}
func (c *dockerClient) Info() (*dockertypes.Info, error) {
ctx, cancel := c.getTimeoutContext()
defer cancel()
info, err := c.client.Info(ctx)
if err := clientErr(ctx, err); err != nil {
return nil, err
}
return &info, nil
}
func (c *dockerClient) ContainerList(options dockertypes.ContainerListOptions) ([]dockertypes.Container, error) {
ctx, cancel := c.getTimeoutContext()
defer cancel()
containers, err := c.client.ContainerList(ctx, options)
if err := clientErr(ctx, err); err != nil {
return nil, err
}
return containers, nil
}
func (c *dockerClient) ContainerRemove(id string, opts dockertypes.ContainerRemoveOptions) error {
ctx, cancel := c.getTimeoutContext()
defer cancel()
err := c.client.ContainerRemove(ctx, id, opts)
return clientErr(ctx, err)
}
func (c *dockerClient) ImageList(opts dockertypes.ImageListOptions) ([]dockertypes.Image, error) {
ctx, cancel := c.getTimeoutContext()
defer cancel()
images, err := c.client.ImageList(ctx, opts)
if err := clientErr(ctx, err); err != nil {
return nil, err
}
return images, nil
}
func (c *dockerClient) ImageRemove(image string, opts dockertypes.ImageRemoveOptions) error {
ctx, cancel := c.getTimeoutContext()
defer cancel()
_, err := c.client.ImageRemove(ctx, image, opts)
return clientErr(ctx, err)
}