126 lines
4.0 KiB
Go
126 lines
4.0 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ 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 <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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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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// LoadFuncName 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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LoadFuncName = "load"
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loadSignature = "struct{x1 float; x5 float; x15 float}"
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)
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func init() {
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facts.ModuleRegister(ModuleName, LoadFuncName, func() facts.Fact { return &LoadFact{} }) // must register the fact and name
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}
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// LoadFact is a fact which returns the current system load.
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type LoadFact 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 *LoadFact) String() string {
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return LoadFuncName
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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 *LoadFact) 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 *LoadFact) Info() *facts.Info {
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return &facts.Info{
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Output: types.NewType(loadSignature),
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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 *LoadFact) 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 *LoadFact) Stream(ctx context.Context) error {
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defer close(obj.init.Output) // always signal when we're done
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// it seems the different values only update once every 5
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// seconds, so that's as often as we need to refresh this!
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// TODO: lookup this value if it's something configurable
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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 <-ctx.Done():
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return nil
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}
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x1, x5, x15, err := load()
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if err != nil {
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return errwrap.Wrapf(err, "could not read load values")
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}
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st := types.NewStruct(types.NewType(loadSignature))
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for k, v := range map[string]float64{"x1": x1, "x5": x5, "x15": x15} {
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if err := st.Set(k, &types.FloatValue{V: v}); err != nil {
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return errwrap.Wrapf(err, "struct could not set key: `%s`", k)
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}
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}
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select {
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case obj.init.Output <- st:
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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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