85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
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package procstat
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import (
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"fmt"
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"io/ioutil"
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"os/exec"
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"strconv"
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"strings"
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)
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// Implemention of PIDGatherer that execs pgrep to find processes
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type Pgrep struct {
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path string
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}
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func NewPgrep() (PIDFinder, error) {
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path, err := exec.LookPath("pgrep")
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if err != nil {
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return nil, fmt.Errorf("Could not find pgrep binary: %s", err)
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}
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return &Pgrep{path}, nil
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}
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func (pg *Pgrep) PidFile(path string) ([]PID, error) {
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var pids []PID
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pidString, err := ioutil.ReadFile(path)
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if err != nil {
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return pids, fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'",
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path, err)
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}
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pid, err := strconv.Atoi(strings.TrimSpace(string(pidString)))
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if err != nil {
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return pids, err
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}
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pids = append(pids, PID(pid))
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return pids, nil
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}
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func (pg *Pgrep) Pattern(pattern string) ([]PID, error) {
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args := []string{pattern}
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return find(pg.path, args)
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}
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func (pg *Pgrep) Uid(user string) ([]PID, error) {
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args := []string{"-u", user}
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return find(pg.path, args)
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}
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func (pg *Pgrep) FullPattern(pattern string) ([]PID, error) {
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args := []string{"-f", pattern}
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return find(pg.path, args)
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}
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func find(path string, args []string) ([]PID, error) {
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out, err := run(path, args)
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if err != nil {
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return nil, err
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}
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return parseOutput(out)
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}
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func run(path string, args []string) (string, error) {
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out, err := exec.Command(path, args...).Output()
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if err != nil {
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return "", fmt.Errorf("Error running %s: %s", path, err)
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}
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return string(out), err
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}
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func parseOutput(out string) ([]PID, error) {
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pids := []PID{}
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fields := strings.Fields(out)
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for _, field := range fields {
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pid, err := strconv.Atoi(field)
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if err != nil {
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return nil, err
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}
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if err == nil {
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pids = append(pids, PID(pid))
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}
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}
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return pids, nil
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}
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