site/vendor/github.com/google/gops/goprocess/gp.go

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2017-12-13 18:43:58 +00:00
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package goprocess reports the Go processes running on a host.
package goprocess
import (
"os"
"sync"
goversion "rsc.io/goversion/version"
"github.com/google/gops/internal"
ps "github.com/keybase/go-ps"
)
// P represents a Go process.
type P struct {
PID int
PPID int
Exec string
Path string
BuildVersion string
Agent bool
}
// FindAll returns all the Go processes currently running on this host.
func FindAll() []P {
var results []P
pss, err := ps.Processes()
if err != nil {
return results
}
var wg sync.WaitGroup
wg.Add(len(pss))
for _, pr := range pss {
pr := pr
go func() {
defer wg.Done()
path, version, agent, ok, err := isGo(pr)
if err != nil {
// TODO(jbd): Return a list of errors.
}
if !ok {
return
}
results = append(results, P{
PID: pr.Pid(),
PPID: pr.PPid(),
Exec: pr.Executable(),
Path: path,
BuildVersion: version,
Agent: agent,
})
}()
}
wg.Wait()
return results
}
// Find finds info about the process identified with the given PID.
func Find(pid int) (p P, ok bool, err error) {
pr, err := ps.FindProcess(pid)
if err != nil {
return P{}, false, err
}
path, version, agent, ok, err := isGo(pr)
if !ok {
return P{}, false, nil
}
return P{
PID: pr.Pid(),
PPID: pr.PPid(),
Exec: pr.Executable(),
Path: path,
BuildVersion: version,
Agent: agent,
}, true, nil
}
// isGo looks up the runtime.buildVersion symbol
// in the process' binary and determines if the process
// if a Go process or not. If the process is a Go process,
// it reports PID, binary name and full path of the binary.
func isGo(pr ps.Process) (path, version string, agent, ok bool, err error) {
if pr.Pid() == 0 {
// ignore system process
return
}
path, err = pr.Path()
if err != nil {
return
}
var versionInfo goversion.Version
versionInfo, err = goversion.ReadExe(path)
if err != nil {
return
}
ok = true
version = versionInfo.Release
pidfile, err := internal.PIDFile(pr.Pid())
if err == nil {
_, err := os.Stat(pidfile)
agent = err == nil
}
return path, version, agent, ok, nil
}