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httpprocprobed/processlist.go

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/*
httpprocwatchd provides HTTP interface to a list of process' statuses
formatted as JSON.
Copyright (c) 2021 Alexander "Arav" Andreev <me@arav.top>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"encoding/xml"
"os/exec"
"strconv"
"strings"
)
// ProcessList is a map of processes' statuses.
type ProcessList map[string]bool
// NewProcessList returns a ProcessList with initialised map.
func NewProcessList() *ProcessList {
pl := make(ProcessList)
return &pl
}
// AddProcess appends a process to a ProcessList
func (pl *ProcessList) AddProcess(name string, isup bool) {
(*pl)[name] = isup
}
// ProcessXMLEntry is a XML representation of a process stored in ProcessList.
type ProcessXMLEntry struct {
XMLName xml.Name
Name string `xml:"name,attr"`
IsUp bool `xml:",chardata"`
}
// MarshalXML implements Marshaler interface for a ProcessList.
func (l ProcessList) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
if len(l) == 0 {
return nil
}
if err := e.EncodeToken(start); err != nil {
return err
}
for key, val := range l {
e.Encode(ProcessXMLEntry{
XMLName: xml.Name{Local: "Process"},
Name: key,
IsUp: val})
}
return e.EncodeToken(start.End())
}
// IsProcessUp returns true if process is up, and a list of PIDs for
// that process name. Uses pgrep to get PID of a process and if
// a process is not working, then pgrep returns nothing.
func IsProcessUp(name string) (bool, []int, error) {
out, err := exec.Command("pgrep", "-f", name).Output()
if err != nil || len(out) < 2 {
return false, nil, err
}
spids := strings.Split(string(out[:len(out)-1]), "\n")
pids := make([]int, len(spids))
for i, v := range spids {
pids[i], err = strconv.Atoi(v)
if err != nil {
return false, nil, nil
}
}
return true, pids, nil
}