mirror of
https://github.com/google/gops.git
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9069aa4d19
Manual command setup was starting to show some strain in terms of documentation and also adding new features (regardless of what the protocol supports currently). This new setup aims to make it easier to add new documentation and functionality. In comparison to the previous version, this increased the binary size by 2.4M. ``` 6.4M gops 4.0M gops_master ```
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cmd
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import (
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"fmt"
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"sort"
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"strconv"
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"github.com/google/gops/goprocess"
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"github.com/spf13/cobra"
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"github.com/xlab/treeprint"
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)
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// TreeCommand displays a process tree.
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func TreeCommand() *cobra.Command {
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return &cobra.Command{
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Use: "tree",
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Short: "Display parent-child tree for Go processes.",
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Run: func(cmd *cobra.Command, args []string) {
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displayProcessTree()
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},
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}
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}
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// displayProcessTree displays a tree of all the running Go processes.
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func displayProcessTree() {
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ps := goprocess.FindAll()
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sort.Slice(ps, func(i, j int) bool {
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return ps[i].PPID < ps[j].PPID
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})
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pstree := make(map[int][]goprocess.P, len(ps))
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for _, p := range ps {
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pstree[p.PPID] = append(pstree[p.PPID], p)
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}
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tree := treeprint.New()
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tree.SetValue("...")
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seen := map[int]bool{}
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for _, p := range ps {
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constructProcessTree(p.PPID, p, pstree, seen, tree)
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}
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fmt.Println(tree.String())
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}
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// constructProcessTree constructs the process tree in a depth-first fashion.
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func constructProcessTree(ppid int, process goprocess.P, pstree map[int][]goprocess.P, seen map[int]bool, tree treeprint.Tree) {
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if seen[ppid] {
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return
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}
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seen[ppid] = true
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if ppid != process.PPID {
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output := strconv.Itoa(ppid) + " (" + process.Exec + ")" + " {" + process.BuildVersion + "}"
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if process.Agent {
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tree = tree.AddMetaBranch("*", output)
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} else {
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tree = tree.AddBranch(output)
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}
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} else {
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tree = tree.AddBranch(ppid)
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}
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for index := range pstree[ppid] {
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process := pstree[ppid][index]
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constructProcessTree(process.PID, process, pstree, seen, tree)
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}
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}
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