b134c4b778
This removes the `Close() error` and replaces it with a more modern Stream API that takes a context. This removes boilerplate and makes integration with concurrent code easier. The only downside is that there isn't an explicit cleanup step, but only one function was even using that and it was possible to switch it to a defer in Stream. This also renames the functions from polyfunc to just func which we determine by API not naming.
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
// Mgmt
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// Copyright (C) 2013-2023+ 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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"context"
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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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}
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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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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(ctx context.Context) 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 <-ctx.Done():
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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 <-ctx.Done():
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return nil
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}
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}
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}
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