docker: github.com/docker/docker/pkg/plugins Index | Files | Directories

package plugins

import "github.com/docker/docker/pkg/plugins"

Package plugins provides structures and helper functions to manage Docker plugins.

Docker discovers plugins by looking for them in the plugin directory whenever a user or container tries to use one by name. UNIX domain socket files must be located under /run/docker/plugins, whereas spec files can be located either under /etc/docker/plugins or /usr/lib/docker/plugins. This is handled by the Registry interface, which lets you list all plugins or get a plugin by its name if it exists.

The plugins need to implement an HTTP server and bind this to the UNIX socket or the address specified in the spec files. A handshake is send at /Plugin.Activate, and plugins are expected to return a Manifest with a list of Docker subsystems which this plugin implements.

In order to use a plugins, you can use the “Get“ with the name of the plugin and the subsystem it implements.

plugin, err := plugins.Get("example", "VolumeDriver")
if err != nil {
	return fmt.Errorf("Error looking up volume plugin example: %v", err)
}

Index

Package Files

client.go discovery.go discovery_unix.go errors.go plugins.go plugins_unix.go

Constants

const ProtocolSchemeHTTPV1 = "moby.plugins.http/v1"

ProtocolSchemeHTTPV1 is the name of the protocol used for interacting with plugins using this package.

Variables

var (
    // ErrNotFound plugin not found
    ErrNotFound = errors.New("plugin not found")
)
var (
    // ErrNotImplements is returned if the plugin does not implement the requested driver.
    ErrNotImplements = errors.New("Plugin does not implement the requested driver")
)

func Handle Uses

func Handle(iface string, fn func(string, *Client))

Handle adds the specified function to the extpointHandlers.

func IsNotFound Uses

func IsNotFound(err error) bool

IsNotFound indicates if the passed in error is from an http.StatusNotFound from the plugin

func Scan Uses

func Scan() ([]string, error)

Scan scans all the plugin paths and returns all the names it found

func WithRequestTimeout Uses

func WithRequestTimeout(t time.Duration) func(*RequestOpts)

WithRequestTimeout sets a timeout duration for plugin requests

type Client Uses

type Client struct {
    // contains filtered or unexported fields
}

Client represents a plugin client.

func NewClient Uses

func NewClient(addr string, tlsConfig *tlsconfig.Options) (*Client, error)

NewClient creates a new plugin client (http).

func NewClientWithTimeout Uses

func NewClientWithTimeout(addr string, tlsConfig *tlsconfig.Options, timeout time.Duration) (*Client, error)

NewClientWithTimeout creates a new plugin client (http).

func (*Client) Call Uses

func (c *Client) Call(serviceMethod string, args, ret interface{}) error

Call calls the specified method with the specified arguments for the plugin. It will retry for 30 seconds if a failure occurs when calling.

func (*Client) CallWithOptions Uses

func (c *Client) CallWithOptions(serviceMethod string, args interface{}, ret interface{}, opts ...func(*RequestOpts)) error

CallWithOptions is just like call except it takes options

func (*Client) SendFile Uses

func (c *Client) SendFile(serviceMethod string, data io.Reader, ret interface{}) error

SendFile calls the specified method, and passes through the IO stream

func (*Client) Stream Uses

func (c *Client) Stream(serviceMethod string, args interface{}) (io.ReadCloser, error)

Stream calls the specified method with the specified arguments for the plugin and returns the response body

type Manifest Uses

type Manifest struct {
    // List of subsystem the plugin implements.
    Implements []string
}

Manifest lists what a plugin implements.

type Plugin Uses

type Plugin struct {

    // Address of the plugin
    Addr string
    // TLS configuration of the plugin
    TLSConfig *tlsconfig.Options

    // Manifest of the plugin (see above)
    Manifest *Manifest `json:"-"`
    // contains filtered or unexported fields
}

Plugin is the definition of a docker plugin.

func Get Uses

func Get(name, imp string) (*Plugin, error)

Get returns the plugin given the specified name and requested implementation.

func GetAll Uses

func GetAll(imp string) ([]*Plugin, error)

GetAll returns all the plugins for the specified implementation

func NewLocalPlugin Uses

func NewLocalPlugin(name, addr string) *Plugin

NewLocalPlugin creates a new local plugin.

func (*Plugin) Client Uses

func (p *Plugin) Client() *Client

Client returns a ready-to-use plugin client that can be used to communicate with the plugin.

func (*Plugin) IsV1 Uses

func (p *Plugin) IsV1() bool

IsV1 returns true for V1 plugins and false otherwise.

func (*Plugin) Name Uses

func (p *Plugin) Name() string

Name returns the name of the plugin.

func (*Plugin) Protocol Uses

func (p *Plugin) Protocol() string

Protocol returns the protocol name/version used for plugins in this package.

func (*Plugin) ScopedPath Uses

func (p *Plugin) ScopedPath(s string) string

ScopedPath returns the path scoped to the plugin's rootfs. For v1 plugins, this always returns the path unchanged as v1 plugins run directly on the host.

type RequestOpts Uses

type RequestOpts struct {
    Timeout time.Duration
}

RequestOpts is the set of options that can be passed into a request

Directories

PathSynopsis
pluginrpc-gen
pluginrpc-gen/fixtures
pluginrpc-gen/fixtures/otherfixture
transport

Package plugins imports 20 packages (graph) and is imported by 1286 packages. Updated 2020-05-11. Refresh now. Tools for package owners.