plugins

package
v1.9.0-alpha.1 Latest Latest
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Published: Sep 22, 2017 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Index

Constants

View Source
const PluginDescriptorFilename = "plugin.yaml"

Variables

View Source
var (
	IncompletePluginError     = fmt.Errorf("incomplete plugin descriptor: name, shortDesc and command fields are required")
	InvalidPluginNameError    = fmt.Errorf("plugin name can't contain spaces")
	IncompleteFlagError       = fmt.Errorf("incomplete flag descriptor: name and desc fields are required")
	InvalidFlagNameError      = fmt.Errorf("flag name can't contain spaces")
	InvalidFlagShorthandError = fmt.Errorf("flag shorthand must be only one letter")
)

Functions

func FlagToEnvName

func FlagToEnvName(flagName, prefix string) string

Types

type Description

type Description struct {
	Name      string  `json:"name"`
	ShortDesc string  `json:"shortDesc"`
	LongDesc  string  `json:"longDesc,omitempty"`
	Example   string  `json:"example,omitempty"`
	Command   string  `json:"command"`
	Flags     []Flag  `json:"flags,omitempty"`
	Tree      Plugins `json:"tree,omitempty"`
}

PluginDescription holds everything needed to register a plugin as a command. Usually comes from a descriptor file.

type DirectoryPluginLoader

type DirectoryPluginLoader struct {
	Directory string
}

DirectoryPluginLoader is a PluginLoader that loads plugin descriptions from a given directory in the filesystem. Plugins are located in subdirs under the loader "root", where each subdir must contain, at least, a plugin descriptor file called "plugin.yaml" that translates into a PluginDescription.

func (*DirectoryPluginLoader) Load

func (l *DirectoryPluginLoader) Load() (Plugins, error)

Load reads the directory the loader holds and loads plugin descriptions.

type DummyPluginLoader

type DummyPluginLoader struct{}

DummyPluginLoader loads nothing.

func (*DummyPluginLoader) Load

func (l *DummyPluginLoader) Load() (Plugins, error)

type EmptyEnvProvider

type EmptyEnvProvider struct{}

func (*EmptyEnvProvider) Env

func (p *EmptyEnvProvider) Env() (EnvList, error)

type Env

type Env struct {
	N string
	V string
}

Env represents an environment variable with its name and value

func FlagToEnv

func FlagToEnv(flag *pflag.Flag, prefix string) Env

func (Env) String

func (e Env) String() string

type EnvList

type EnvList []Env

EnvList is a list of Env

func (EnvList) Merge

func (e EnvList) Merge(s ...string) EnvList

func (EnvList) Slice

func (e EnvList) Slice() []string

type EnvProvider

type EnvProvider interface {
	Env() (EnvList, error)
}

EnvProvider provides the environment in which the plugin will run.

type ExecPluginRunner

type ExecPluginRunner struct{}

ExecPluginRunner is a PluginRunner that uses Go's os/exec to run plugins.

func (*ExecPluginRunner) Run

func (r *ExecPluginRunner) Run(plugin *Plugin, ctx RunningContext) error

Run takes a given plugin and runs it in a given context using os/exec, returning any error found while running.

type Flag added in v1.8.1

type Flag struct {
	Name      string `json:"name"`
	Shorthand string `json:"shorthand,omitempty"`
	Desc      string `json:"desc"`
	DefValue  string `json:"defValue,omitempty"`
}

Flag describes a single flag supported by a given plugin.

func (Flag) Shorthanded added in v1.8.1

func (f Flag) Shorthanded() bool

func (Flag) Validate added in v1.8.1

func (f Flag) Validate() error

func (Flag) ValidateShorthand added in v1.8.1

func (f Flag) ValidateShorthand() error

type MultiEnvProvider

type MultiEnvProvider []EnvProvider

MultiEnvProvider is an EnvProvider for multiple env providers, returns on first error.

func (MultiEnvProvider) Env

func (p MultiEnvProvider) Env() (EnvList, error)

type MultiPluginLoader

type MultiPluginLoader []PluginLoader

MultiPluginLoader is a PluginLoader that can encapsulate multiple plugin loaders, a successful loading means every encapsulated loader was able to load without errors.

func (MultiPluginLoader) Load

func (l MultiPluginLoader) Load() (Plugins, error)

type OSEnvProvider

type OSEnvProvider struct{}

OSEnvProvider provides current environment from the operating system.

func (*OSEnvProvider) Env

func (p *OSEnvProvider) Env() (EnvList, error)

type Plugin

type Plugin struct {
	Description
	Source
	Context RunningContext `json:"-"`
}

Plugin is the representation of a CLI extension (plugin).

func (Plugin) IsValid

func (p Plugin) IsValid() bool

func (Plugin) Validate

func (p Plugin) Validate() error

type PluginCallerEnvProvider

type PluginCallerEnvProvider struct{}

PluginCallerEnvProvider provides env with the path to the caller binary (usually full path to 'kubectl').

func (*PluginCallerEnvProvider) Env

type PluginDescriptorEnvProvider

type PluginDescriptorEnvProvider struct {
	Plugin *Plugin
}

PluginDescriptorEnvProvider provides env vars with information about the running plugin.

func (*PluginDescriptorEnvProvider) Env

type PluginLoader

type PluginLoader interface {
	Load() (Plugins, error)
}

PluginLoader is capable of loading a list of plugin descriptions.

func PathFromEnvVarPluginLoader

func PathFromEnvVarPluginLoader(envVarName string, subdirs ...string) PluginLoader

PathFromEnvVarPluginLoader is a PluginLoader that loads plugins from one or more directories specified by the provided env var name. In case the env var is not set, the PluginLoader just loads nothing. A list of subdirectories can be provided, which will be appended to each path specified by the env var.

func PluginsEnvVarPluginLoader

func PluginsEnvVarPluginLoader() PluginLoader

PluginsEnvVarPluginLoader is a PluginLoader that loads plugins from one or more directories specified by the KUBECTL_PLUGINS_PATH env var.

func UserDirPluginLoader

func UserDirPluginLoader() PluginLoader

UserDirPluginLoader is a PluginLoader that loads plugins from the "plugins" directory under the user's kubeconfig dir (usually "~/.kube/plugins/").

func XDGDataPluginLoader

func XDGDataPluginLoader() PluginLoader

XDGDataPluginLoader is a PluginLoader that loads plugins from one or more directories specified by the XDG system directory structure spec in the XDG_DATA_DIRS env var, plus the "kubectl/plugins/" suffix. According to the spec, if XDG_DATA_DIRS is not set it defaults to "/usr/local/share:/usr/share".

type PluginRunner

type PluginRunner interface {
	Run(plugin *Plugin, ctx RunningContext) error
}

PluginRunner is capable of running a plugin in a given running context.

type Plugins

type Plugins []*Plugin

Plugins is a list of plugins.

type RunningContext

type RunningContext struct {
	In          io.Reader
	Out         io.Writer
	ErrOut      io.Writer
	Args        []string
	EnvProvider EnvProvider
	WorkingDir  string
}

RunningContext holds the context in which a given plugin is running - the in, out, and err streams, arguments and environment passed to it, and the working directory.

type Source

type Source struct {
	Dir            string `json:"-"`
	DescriptorName string `json:"-"`
}

PluginSource holds the location of a given plugin in the filesystem.

type TolerantMultiPluginLoader

type TolerantMultiPluginLoader []PluginLoader

TolerantMultiPluginLoader is a PluginLoader than encapsulates multiple plugins loaders, but is tolerant to errors while loading from them.

func (TolerantMultiPluginLoader) Load

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