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plugin.go
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plugin.go
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package v2
import (
"fmt"
"strings"
"sync"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/plugingetter"
"github.com/docker/docker/pkg/plugins"
"github.com/opencontainers/go-digest"
)
// Plugin represents an individual plugin.
type Plugin struct {
mu sync.RWMutex
PluginObj types.Plugin `json:"plugin"` // todo: embed struct
pClient *plugins.Client
refCount int
PropagatedMount string // TODO: make private
Rootfs string // TODO: make private
Config digest.Digest
Blobsums []digest.Digest
SwarmServiceID string
}
const defaultPluginRuntimeDestination = "/run/docker/plugins"
// ErrInadequateCapability indicates that the plugin did not have the requested capability.
type ErrInadequateCapability struct {
cap string
}
func (e ErrInadequateCapability) Error() string {
return fmt.Sprintf("plugin does not provide %q capability", e.cap)
}
// BasePath returns the path to which all paths returned by the plugin are relative to.
// For Plugin objects this returns the host path of the plugin container's rootfs.
func (p *Plugin) BasePath() string {
return p.Rootfs
}
// Client returns the plugin client.
func (p *Plugin) Client() *plugins.Client {
p.mu.RLock()
defer p.mu.RUnlock()
return p.pClient
}
// SetPClient set the plugin client.
func (p *Plugin) SetPClient(client *plugins.Client) {
p.mu.Lock()
defer p.mu.Unlock()
p.pClient = client
}
// IsV1 returns true for V1 plugins and false otherwise.
func (p *Plugin) IsV1() bool {
return false
}
// Name returns the plugin name.
func (p *Plugin) Name() string {
return p.PluginObj.Name
}
// FilterByCap query the plugin for a given capability.
func (p *Plugin) FilterByCap(capability string) (*Plugin, error) {
capability = strings.ToLower(capability)
for _, typ := range p.PluginObj.Config.Interface.Types {
if typ.Capability == capability && typ.Prefix == "docker" {
return p, nil
}
}
return nil, ErrInadequateCapability{capability}
}
// InitEmptySettings initializes empty settings for a plugin.
func (p *Plugin) InitEmptySettings() {
p.PluginObj.Settings.Mounts = make([]types.PluginMount, len(p.PluginObj.Config.Mounts))
copy(p.PluginObj.Settings.Mounts, p.PluginObj.Config.Mounts)
p.PluginObj.Settings.Devices = make([]types.PluginDevice, len(p.PluginObj.Config.Linux.Devices))
copy(p.PluginObj.Settings.Devices, p.PluginObj.Config.Linux.Devices)
p.PluginObj.Settings.Env = make([]string, 0, len(p.PluginObj.Config.Env))
for _, env := range p.PluginObj.Config.Env {
if env.Value != nil {
p.PluginObj.Settings.Env = append(p.PluginObj.Settings.Env, fmt.Sprintf("%s=%s", env.Name, *env.Value))
}
}
p.PluginObj.Settings.Args = make([]string, len(p.PluginObj.Config.Args.Value))
copy(p.PluginObj.Settings.Args, p.PluginObj.Config.Args.Value)
}
// Set is used to pass arguments to the plugin.
func (p *Plugin) Set(args []string) error {
p.mu.Lock()
defer p.mu.Unlock()
if p.PluginObj.Enabled {
return fmt.Errorf("cannot set on an active plugin, disable plugin before setting")
}
sets, err := newSettables(args)
if err != nil {
return err
}
// TODO(vieux): lots of code duplication here, needs to be refactored.
next:
for _, s := range sets {
// range over all the envs in the config
for _, env := range p.PluginObj.Config.Env {
// found the env in the config
if env.Name == s.name {
// is it settable ?
if ok, err := s.isSettable(allowedSettableFieldsEnv, env.Settable); err != nil {
return err
} else if !ok {
return fmt.Errorf("%q is not settable", s.prettyName())
}
// is it, so lets update the settings in memory
updateSettingsEnv(&p.PluginObj.Settings.Env, &s)
continue next
}
}
// range over all the mounts in the config
for _, mount := range p.PluginObj.Config.Mounts {
// found the mount in the config
if mount.Name == s.name {
// is it settable ?
if ok, err := s.isSettable(allowedSettableFieldsMounts, mount.Settable); err != nil {
return err
} else if !ok {
return fmt.Errorf("%q is not settable", s.prettyName())
}
// it is, so lets update the settings in memory
if mount.Source == nil {
return fmt.Errorf("Plugin config has no mount source")
}
*mount.Source = s.value
continue next
}
}
// range over all the devices in the config
for _, device := range p.PluginObj.Config.Linux.Devices {
// found the device in the config
if device.Name == s.name {
// is it settable ?
if ok, err := s.isSettable(allowedSettableFieldsDevices, device.Settable); err != nil {
return err
} else if !ok {
return fmt.Errorf("%q is not settable", s.prettyName())
}
// it is, so lets update the settings in memory
if device.Path == nil {
return fmt.Errorf("Plugin config has no device path")
}
*device.Path = s.value
continue next
}
}
// found the name in the config
if p.PluginObj.Config.Args.Name == s.name {
// is it settable ?
if ok, err := s.isSettable(allowedSettableFieldsArgs, p.PluginObj.Config.Args.Settable); err != nil {
return err
} else if !ok {
return fmt.Errorf("%q is not settable", s.prettyName())
}
// it is, so lets update the settings in memory
p.PluginObj.Settings.Args = strings.Split(s.value, " ")
continue next
}
return fmt.Errorf("setting %q not found in the plugin configuration", s.name)
}
return nil
}
// IsEnabled returns the active state of the plugin.
func (p *Plugin) IsEnabled() bool {
p.mu.RLock()
defer p.mu.RUnlock()
return p.PluginObj.Enabled
}
// GetID returns the plugin's ID.
func (p *Plugin) GetID() string {
p.mu.RLock()
defer p.mu.RUnlock()
return p.PluginObj.ID
}
// GetSocket returns the plugin socket.
func (p *Plugin) GetSocket() string {
p.mu.RLock()
defer p.mu.RUnlock()
return p.PluginObj.Config.Interface.Socket
}
// GetTypes returns the interface types of a plugin.
func (p *Plugin) GetTypes() []types.PluginInterfaceType {
p.mu.RLock()
defer p.mu.RUnlock()
return p.PluginObj.Config.Interface.Types
}
// GetRefCount returns the reference count.
func (p *Plugin) GetRefCount() int {
p.mu.RLock()
defer p.mu.RUnlock()
return p.refCount
}
// AddRefCount adds to reference count.
func (p *Plugin) AddRefCount(count int) {
p.mu.Lock()
defer p.mu.Unlock()
p.refCount += count
}
// Acquire increments the plugin's reference count
// This should be followed up by `Release()` when the plugin is no longer in use.
func (p *Plugin) Acquire() {
p.AddRefCount(plugingetter.Acquire)
}
// Release decrements the plugin's reference count
// This should only be called when the plugin is no longer in use, e.g. with
// via `Acquire()` or getter.Get("name", "type", plugingetter.Acquire)
func (p *Plugin) Release() {
p.AddRefCount(plugingetter.Release)
}