1370f2a76b
This is a monster patch that splits out the yaml and puppet based graph generation and pushes them behind a common API. In addition alternate pluggable GAPI's can be easily added! The important side benefit is that you can now write a custom GAPI for embedding mgmt! This also includes some slight clean ups that I didn't find it worth splitting into separate patches.
122 lines
3.4 KiB
Go
122 lines
3.4 KiB
Go
// Mgmt
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// Copyright (C) 2013-2016+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package puppet
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import (
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"fmt"
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"log"
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"sync"
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"time"
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"github.com/purpleidea/mgmt/gapi"
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"github.com/purpleidea/mgmt/pgraph"
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)
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// GAPI implements the main puppet GAPI interface.
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type GAPI struct {
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PuppetParam *string // puppet mode to run; nil if undefined
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PuppetConf string // the path to an alternate puppet.conf file
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data gapi.Data
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initialized bool
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closeChan chan struct{}
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wg sync.WaitGroup // sync group for tunnel go routines
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}
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// NewGAPI creates a new puppet GAPI struct and calls Init().
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func NewGAPI(data gapi.Data, puppetParam *string, puppetConf string) (*GAPI, error) {
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obj := &GAPI{
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PuppetParam: puppetParam,
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PuppetConf: puppetConf,
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}
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return obj, obj.Init(data)
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}
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// Init initializes the puppet GAPI struct.
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func (obj *GAPI) Init(data gapi.Data) error {
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if obj.initialized {
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return fmt.Errorf("Already initialized!")
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}
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if obj.PuppetParam == nil {
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return fmt.Errorf("The PuppetParam param must be specified!")
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}
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obj.data = data // store for later
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obj.closeChan = make(chan struct{})
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obj.initialized = true
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return nil
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}
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// Graph returns a current Graph.
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func (obj *GAPI) Graph() (*pgraph.Graph, error) {
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if !obj.initialized {
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return nil, fmt.Errorf("Puppet: GAPI is not initialized!")
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}
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config := ParseConfigFromPuppet(*obj.PuppetParam, obj.PuppetConf)
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if config == nil {
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return nil, fmt.Errorf("Puppet: ParseConfigFromPuppet returned nil!")
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}
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g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.EmbdEtcd, obj.data.Noop)
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return g, err
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}
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// SwitchStream returns nil errors every time there could be a new graph.
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func (obj *GAPI) SwitchStream() chan error {
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if obj.data.NoWatch {
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return nil
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}
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puppetChan := func() <-chan time.Time { // helper function
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return time.Tick(time.Duration(PuppetInterval(obj.PuppetConf)) * time.Second)
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}
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ch := make(chan error)
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obj.wg.Add(1)
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go func() {
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defer obj.wg.Done()
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defer close(ch) // this will run before the obj.wg.Done()
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if !obj.initialized {
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ch <- fmt.Errorf("Puppet: GAPI is not initialized!")
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return
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}
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pChan := puppetChan()
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for {
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select {
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case _, ok := <-pChan:
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if !ok { // the channel closed!
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return
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}
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log.Printf("Puppet: Generating new graph...")
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pChan = puppetChan() // TODO: okay to update interval in case it changed?
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ch <- nil // trigger a run
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case <-obj.closeChan:
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return
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}
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}
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}()
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return ch
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}
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// Close shuts down the Puppet GAPI.
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func (obj *GAPI) Close() error {
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if !obj.initialized {
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return fmt.Errorf("Puppet: GAPI is not initialized!")
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}
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close(obj.closeChan)
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obj.wg.Wait()
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obj.initialized = false // closed = true
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return nil
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}
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