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gapi.go
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gapi.go
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// Mgmt
// Copyright (C) 2013-2017+ 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 Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package puppet
import (
"fmt"
"log"
"sync"
"time"
"github.com/purpleidea/mgmt/gapi"
"github.com/purpleidea/mgmt/pgraph"
)
// GAPI implements the main puppet GAPI interface.
type GAPI struct {
PuppetParam *string // puppet mode to run; nil if undefined
PuppetConf string // the path to an alternate puppet.conf file
data gapi.Data
initialized bool
closeChan chan struct{}
wg sync.WaitGroup // sync group for tunnel go routines
}
// NewGAPI creates a new puppet GAPI struct and calls Init().
func NewGAPI(data gapi.Data, puppetParam *string, puppetConf string) (*GAPI, error) {
obj := &GAPI{
PuppetParam: puppetParam,
PuppetConf: puppetConf,
}
return obj, obj.Init(data)
}
// Init initializes the puppet GAPI struct.
func (obj *GAPI) Init(data gapi.Data) error {
if obj.initialized {
return fmt.Errorf("Already initialized!")
}
if obj.PuppetParam == nil {
return fmt.Errorf("The PuppetParam param must be specified!")
}
obj.data = data // store for later
obj.closeChan = make(chan struct{})
obj.initialized = true
return nil
}
// Graph returns a current Graph.
func (obj *GAPI) Graph() (*pgraph.Graph, error) {
if !obj.initialized {
return nil, fmt.Errorf("Puppet: GAPI is not initialized!")
}
config := ParseConfigFromPuppet(*obj.PuppetParam, obj.PuppetConf)
if config == nil {
return nil, fmt.Errorf("Puppet: ParseConfigFromPuppet returned nil!")
}
g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
return g, err
}
// Next returns nil errors every time there could be a new graph.
func (obj *GAPI) Next() chan error {
if obj.data.NoWatch {
return nil
}
puppetChan := func() <-chan time.Time { // helper function
return time.Tick(time.Duration(PuppetInterval(obj.PuppetConf)) * time.Second)
}
ch := make(chan error)
obj.wg.Add(1)
go func() {
defer obj.wg.Done()
defer close(ch) // this will run before the obj.wg.Done()
if !obj.initialized {
ch <- fmt.Errorf("Puppet: GAPI is not initialized!")
return
}
pChan := puppetChan()
for {
select {
case _, ok := <-pChan:
if !ok { // the channel closed!
return
}
log.Printf("Puppet: Generating new graph...")
pChan = puppetChan() // TODO: okay to update interval in case it changed?
select {
case ch <- nil: // trigger a run (send a msg)
// unblock if we exit while waiting to send!
case <-obj.closeChan:
return
}
case <-obj.closeChan:
return
}
}
}()
return ch
}
// Close shuts down the Puppet GAPI.
func (obj *GAPI) Close() error {
if !obj.initialized {
return fmt.Errorf("Puppet: GAPI is not initialized!")
}
close(obj.closeChan)
obj.wg.Wait()
obj.initialized = false // closed = true
return nil
}