127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
// Mgmt
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// Copyright (C) 2013-2017+ 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 yamlgraph
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import (
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"fmt"
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"log"
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"sync"
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"github.com/purpleidea/mgmt/gapi"
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"github.com/purpleidea/mgmt/pgraph"
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"github.com/purpleidea/mgmt/recwatch"
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)
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// GAPI implements the main yamlgraph GAPI interface.
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type GAPI struct {
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File *string // yaml graph definition to use; nil if undefined
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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 yamlgraph GAPI struct and calls Init().
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func NewGAPI(data gapi.Data, file *string) (*GAPI, error) {
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obj := &GAPI{
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File: file,
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}
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return obj, obj.Init(data)
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}
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// Init initializes the yamlgraph 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.File == nil {
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return fmt.Errorf("The File 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("yamlgraph: GAPI is not initialized")
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}
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config := ParseConfigFromFile(*obj.File)
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if config == nil {
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return nil, fmt.Errorf("yamlgraph: ParseConfigFromFile returned nil")
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}
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g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
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return g, err
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}
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// Next returns nil errors every time there could be a new graph.
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func (obj *GAPI) Next() chan error {
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if obj.data.NoWatch {
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return nil
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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("yamlgraph: GAPI is not initialized")
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return
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}
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configWatcher := recwatch.NewConfigWatcher()
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configChan := configWatcher.ConfigWatch(*obj.File) // simple
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for {
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select {
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case err, ok := <-configChan: // returns nil events on ok!
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if !ok { // the channel closed!
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return
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}
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log.Printf("yamlgraph: Generating new graph...")
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select {
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case ch <- err: // trigger a run (send a msg)
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if err != nil {
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return
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}
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// unblock if we exit while waiting to send!
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case <-obj.closeChan:
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return
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}
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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 yamlgraph GAPI.
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func (obj *GAPI) Close() error {
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if !obj.initialized {
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return fmt.Errorf("yamlgraph: 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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