90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
/*
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httpprocwatchd provides HTTP interface to a list of process' statuses
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formatted as JSON.
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Copyright (c) 2021 Alexander "Arav" Andreev <me@arav.top>
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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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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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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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package main
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import (
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"encoding/xml"
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"os/exec"
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"strconv"
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"strings"
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)
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// ProcessList is a map of processes' statuses.
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type ProcessList map[string]bool
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// NewProcessList returns a ProcessList with initialised map.
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func NewProcessList() *ProcessList {
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pl := make(ProcessList)
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return &pl
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}
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// AddProcess appends a process to a ProcessList
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func (pl *ProcessList) AddProcess(name string, isup bool) {
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(*pl)[name] = isup
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}
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// ProcessXMLEntry is a XML representation of a process stored in ProcessList.
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type ProcessXMLEntry struct {
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XMLName xml.Name
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Name string `xml:"name,attr"`
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IsUp bool `xml:",chardata"`
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}
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// MarshalXML implements Marshaler interface for a ProcessList.
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func (l ProcessList) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
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if len(l) == 0 {
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return nil
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}
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if err := e.EncodeToken(start); err != nil {
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return err
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}
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for key, val := range l {
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e.Encode(ProcessXMLEntry{
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XMLName: xml.Name{Local: "Process"},
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Name: key,
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IsUp: val})
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}
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return e.EncodeToken(start.End())
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}
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// IsProcessUp returns true if process is up, and a list of PIDs for
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// that process name. Uses pgrep to get PID of a process and if
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// a process is not working, then pgrep returns nothing.
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func IsProcessUp(name string) (bool, []int, error) {
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out, err := exec.Command("pgrep", "-f", name).Output()
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if err != nil || len(out) < 2 {
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return false, nil, err
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}
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spids := strings.Split(string(out[:len(out)-1]), "\n")
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pids := make([]int, len(spids))
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for i, v := range spids {
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pids[i], err = strconv.Atoi(v)
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if err != nil {
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return false, nil, nil
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}
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}
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return true, pids, nil
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}
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