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factory.go
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factory.go
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// Copyright 2012-2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package runner
import (
"github.com/juju/charm/v9"
"github.com/juju/errors"
"github.com/juju/names/v4"
"github.com/juju/juju/api/agent/uniter"
"github.com/juju/juju/core/actions"
"github.com/juju/juju/worker/common/charmrunner"
"github.com/juju/juju/worker/uniter/hook"
"github.com/juju/juju/worker/uniter/runner/context"
)
// Factory represents a long-lived object that can create runners
// relevant to a specific unit.
type Factory interface {
// NewCommandRunner returns an execution context suitable for running
// an arbitrary script.
NewCommandRunner(commandInfo context.CommandInfo) (Runner, error)
// NewHookRunner returns an execution context suitable for running the
// supplied hook definition (which must be valid).
NewHookRunner(hookInfo hook.Info) (Runner, error)
// NewActionRunner returns an execution context suitable for running the action.
NewActionRunner(action *uniter.Action, cancel <-chan struct{}) (Runner, error)
}
// NewFactory returns a Factory capable of creating runners for executing
// charm hooks, actions and commands.
func NewFactory(
paths context.Paths,
contextFactory context.ContextFactory,
newProcessRunner NewRunnerFunc,
remoteExecutor ExecFunc,
) (
Factory, error,
) {
f := &factory{
paths: paths,
contextFactory: contextFactory,
newProcessRunner: newProcessRunner,
remoteExecutor: remoteExecutor,
}
return f, nil
}
type factory struct {
contextFactory context.ContextFactory
// Fields that shouldn't change in a factory's lifetime.
paths context.Paths
newProcessRunner NewRunnerFunc
remoteExecutor ExecFunc
}
// NewCommandRunner exists to satisfy the Factory interface.
func (f *factory) NewCommandRunner(commandInfo context.CommandInfo) (Runner, error) {
ctx, err := f.contextFactory.CommandContext(commandInfo)
if err != nil {
return nil, errors.Trace(err)
}
runner := f.newProcessRunner(ctx, f.paths, f.remoteExecutor)
return runner, nil
}
// NewHookRunner exists to satisfy the Factory interface.
func (f *factory) NewHookRunner(hookInfo hook.Info) (Runner, error) {
if err := hookInfo.Validate(); err != nil {
return nil, errors.Trace(err)
}
ctx, err := f.contextFactory.HookContext(hookInfo)
if err != nil {
return nil, errors.Trace(err)
}
runner := f.newProcessRunner(ctx, f.paths, f.remoteExecutor)
return runner, nil
}
// NewActionRunner exists to satisfy the Factory interface.
func (f *factory) NewActionRunner(action *uniter.Action, cancel <-chan struct{}) (Runner, error) {
ch, err := getCharm(f.paths.GetCharmDir())
if err != nil {
return nil, errors.Trace(err)
}
name := action.Name()
spec, ok := actions.PredefinedActionsSpec[name]
if !ok {
var ok bool
spec, ok = ch.Actions().ActionSpecs[name]
if !ok {
return nil, charmrunner.NewBadActionError(name, "not defined")
}
}
params := action.Params()
if err := spec.ValidateParams(params); err != nil {
return nil, charmrunner.NewBadActionError(name, err.Error())
}
tag := names.NewActionTag(action.ID())
actionData := context.NewActionData(name, &tag, params, cancel)
ctx, err := f.contextFactory.ActionContext(actionData)
if err != nil {
return nil, charmrunner.NewBadActionError(name, err.Error())
}
runner := f.newProcessRunner(ctx, f.paths, f.remoteExecutor)
return runner, nil
}
func getCharm(charmPath string) (charm.Charm, error) {
ch, err := charm.ReadCharm(charmPath)
if err != nil {
return nil, err
}
return ch, nil
}