98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ 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 core // TODO: should this be in its own individual package?
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import (
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"time"
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"github.com/purpleidea/mgmt/lang/funcs/facts"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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// TODO: rename these `play` facts to start with a test_ prefix or similar
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facts.Register("flipflop", func() facts.Fact { return &FlipFlopFact{} }) // must register the fact and name
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}
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// FlipFlopFact is a fact which flips a bool repeatedly. This is an example fact
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// and is not meant for serious computing. This would be better served by a flip
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// function which you could specify an interval for.
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type FlipFlopFact struct {
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init *facts.Init
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value bool
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closeChan chan struct{}
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}
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// Validate makes sure we've built our struct properly. It is usually unused for
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// normal facts that users can use directly.
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//func (obj *FlipFlopFact) Validate() error {
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// return nil
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//}
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// Info returns some static info about itself.
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func (obj *FlipFlopFact) Info() *facts.Info {
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return &facts.Info{
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Output: types.NewType("bool"),
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}
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}
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// Init runs some startup code for this fact.
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func (obj *FlipFlopFact) Init(init *facts.Init) error {
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obj.init = init
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obj.closeChan = make(chan struct{})
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return nil
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}
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// Stream returns the changing values that this fact has over time.
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func (obj *FlipFlopFact) Stream() error {
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defer close(obj.init.Output) // always signal when we're done
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// TODO: don't hard code 5 sec interval
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ticker := time.NewTicker(time.Duration(5) * time.Second)
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// streams must generate an initial event on startup
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startChan := make(chan struct{}) // start signal
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close(startChan) // kick it off!
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defer ticker.Stop()
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for {
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select {
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case <-startChan: // kick the loop once at start
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startChan = nil // disable
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case <-ticker.C: // received the timer event
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// pass
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case <-obj.closeChan:
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return nil
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}
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select {
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case obj.init.Output <- &types.BoolValue{ // flip
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V: obj.value,
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}:
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case <-obj.closeChan:
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return nil
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}
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obj.value = !obj.value // flip it
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}
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}
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// Close runs some shutdown code for this fact and turns off the stream.
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func (obj *FlipFlopFact) Close() error {
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close(obj.closeChan)
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return nil
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}
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