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// Mgmt
// Copyright (C) 2013-2024+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.
package empty
import (
"fmt"
"sync"
"github.com/purpleidea/mgmt/gapi"
"github.com/purpleidea/mgmt/pgraph"
)
const (
// Name is the name of this frontend.
Name = "empty"
)
func init() {
gapi.Register(Name, func() gapi.GAPI { return &GAPI{} }) // register
}
// GAPI implements the main lang GAPI interface.
type GAPI struct {
data *gapi.Data
initialized bool
closeChan chan struct{}
wg *sync.WaitGroup // sync group for tunnel go routines
}
// Cli takes an *Info struct, and returns our deploy if activated, and if there
// are any validation problems, you should return an error. If there is no
// deploy, then you should return a nil deploy and a nil error.
func (obj *GAPI) Cli(*gapi.Info) (*gapi.Deploy, error) {
return &gapi.Deploy{
Name: Name,
//Noop: false,
GAPI: &GAPI{},
}, nil
}
// Init initializes the lang GAPI struct.
func (obj *GAPI) Init(data *gapi.Data) error {
if obj.initialized {
return fmt.Errorf("already initialized")
}
obj.data = data // store for later
obj.closeChan = make(chan struct{})
obj.wg = &sync.WaitGroup{}
obj.initialized = true
return nil
}
// Info returns some data about the GAPI implementation.
func (obj *GAPI) Info() *gapi.InfoResult {
return &gapi.InfoResult{
URI: "",
}
}
// Graph returns a current Graph.
func (obj *GAPI) Graph() (*pgraph.Graph, error) {
if !obj.initialized {
return nil, fmt.Errorf("%s: GAPI is not initialized", Name)
}
obj.data.Logf("generating empty graph...")
g, err := pgraph.NewGraph("empty")
if err != nil {
return nil, err
}
return g, nil
}
// Next returns nil errors every time there could be a new graph.
func (obj *GAPI) Next() chan gapi.Next {
ch := make(chan gapi.Next)
obj.wg.Add(1)
go func() {
defer obj.wg.Done()
defer close(ch) // this will run before the obj.wg.Done()
if !obj.initialized {
next := gapi.Next{
Err: fmt.Errorf("%s: GAPI is not initialized", Name),
Exit: true, // exit, b/c programming error?
}
select {
case ch <- next:
case <-obj.closeChan:
}
return
}
// send only one event
next := gapi.Next{
Exit: false,
Err: nil,
}
select {
case ch <- next: // trigger a run (send a msg)
// pass
// unblock if we exit while waiting to send!
case <-obj.closeChan:
return
}
}()
return ch
}
// Close shuts down the lang GAPI.
func (obj *GAPI) Close() error {
if !obj.initialized {
return fmt.Errorf("%s: GAPI is not initialized", Name)
}
close(obj.closeChan)
obj.wg.Wait()
obj.initialized = false // closed = true
return nil
}
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