156 lines
3.2 KiB
Go
156 lines
3.2 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 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package hcl
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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 ...
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type GAPI struct {
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File *string
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initialized bool
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data gapi.Data
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wg sync.WaitGroup
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closeChan chan struct{}
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configWatcher *recwatch.ConfigWatcher
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}
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// NewGAPI ...
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func NewGAPI(data gapi.Data, file *string) (*GAPI, error) {
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if file == nil {
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return nil, fmt.Errorf("empty file given")
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}
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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 ...
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func (obj *GAPI) Init(d 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("file cannot be nil")
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}
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obj.data = d
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obj.closeChan = make(chan struct{})
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obj.initialized = true
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obj.configWatcher = recwatch.NewConfigWatcher()
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return nil
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}
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// Graph ...
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func (obj *GAPI) Graph() (*pgraph.Graph, error) {
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config, err := loadHcl(obj.File)
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if err != nil {
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return nil, fmt.Errorf("unable to parse graph: %s", err)
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}
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return graphFromConfig(config, obj.data)
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}
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// Next ...
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func (obj *GAPI) Next() chan gapi.Next {
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ch := make(chan gapi.Next)
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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)
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if !obj.initialized {
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next := gapi.Next{
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Err: fmt.Errorf("hcl: GAPI is not initialized"),
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Exit: true,
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}
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ch <- next
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return
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}
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startChan := make(chan struct{}) // start signal
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close(startChan) // kick it off!
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watchChan, configChan := make(chan error), make(chan error)
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if obj.data.NoConfigWatch {
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configChan = nil
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} else {
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configChan = obj.configWatcher.ConfigWatch(*obj.File) // simple
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}
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if obj.data.NoStreamWatch {
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watchChan = nil
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} else {
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watchChan = obj.data.World.ResWatch()
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}
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for {
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var err error
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var ok bool
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select {
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case <-startChan:
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startChan = nil
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case err, ok = <-watchChan:
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case err, ok = <-configChan:
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if !ok {
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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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log.Printf("hcl: generating new graph")
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next := gapi.Next{
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Err: err,
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}
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select {
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case ch <- next:
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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 ...
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func (obj *GAPI) Close() error {
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if !obj.initialized {
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return fmt.Errorf("hcl: GAPI is not initialized")
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}
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obj.configWatcher.Close()
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close(obj.closeChan)
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obj.wg.Wait()
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obj.initialized = false
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return nil
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}
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