5d664855de
This adds the requirement that all function implementations provider a String() string method so that these can be used as vertices in the pgraph library. If we eventually move to generics for the pgraph DAG, then this might not matter, but it's not bad that these have names either.
101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2022+ 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 coresys
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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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"github.com/purpleidea/mgmt/util/errwrap"
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)
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const (
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// UptimeFuncName is the name this fact is registered as. It's still a
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// Func Name because this is the name space the fact is actually using.
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UptimeFuncName = "uptime"
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)
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func init() {
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facts.ModuleRegister(ModuleName, UptimeFuncName, func() facts.Fact { return &UptimeFact{} })
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}
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// UptimeFact is a fact which returns the current uptime of your system.
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type UptimeFact struct {
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init *facts.Init
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closeChan chan struct{}
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}
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// String returns a simple name for this fact. This is needed so this struct can
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// satisfy the pgraph.Vertex interface.
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func (obj *UptimeFact) String() string {
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return UptimeFuncName
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}
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// Info returns some static info about itself.
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func (obj *UptimeFact) Info() *facts.Info {
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return &facts.Info{
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Output: types.TypeInt,
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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 *UptimeFact) 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 *UptimeFact) Stream() error {
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defer close(obj.init.Output)
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ticker := time.NewTicker(time.Duration(1) * time.Second)
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startChan := make(chan struct{})
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close(startChan)
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defer ticker.Stop()
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for {
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select {
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case <-startChan:
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startChan = nil
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case <-ticker.C:
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// send
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case <-obj.closeChan:
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return nil
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}
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uptime, err := uptime()
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if err != nil {
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return errwrap.Wrapf(err, "could not read uptime value")
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}
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select {
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case obj.init.Output <- &types.IntValue{V: uptime}:
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// send
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case <-obj.closeChan:
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return nil
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}
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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 *UptimeFact) Close() error {
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close(obj.closeChan)
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return nil
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}
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