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/*---------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All rights reserved.

* Licensed under the MIT License. See License.txt in the project root for license information.

*

* Copied from https://github.com/microsoft/vscode-node-debug/blob/master/src/node/extension/processTree.ts

*--------------------------------------------------------------------------------------------*/

/* tslint:disable */

'use strict';

import { spawn, ChildProcess } from 'child_process';

import { join } from 'path';

export class ProcessTreeNode {

children?: ProcessTreeNode[];

constructor(public pid: number, public ppid: number, public command: string, public args: string) {

}

}

export async function getProcessTree(rootPid: number) : Promise<ProcessTreeNode | undefined> {

const map = new Map<number, ProcessTreeNode>();

map.set(0, new ProcessTreeNode(0, 0, '???', ''));

try {

await getProcesses((pid: number, ppid: number, command: string, args: string) => {

if (pid !== ppid) {

map.set(pid, new ProcessTreeNode(pid, ppid, command, args));

}

});

} catch (err) {

return undefined;

}

const values = map.values();

for (const p of values) {

const parent = map.get(p.ppid);

if (parent && parent !== p) {

if (!parent.children) {

parent.children = [];

}

parent.children.push(p);

}

}

if (!isNaN(rootPid) && rootPid > 0) {

return map.get(rootPid);

}

return map.get(0);

}

export function getProcesses(one: (pid: number, ppid: number, command: string, args: string, date?: number) => void) : Promise<void> {

// returns a function that aggregates chunks of data until one or more complete lines are received and passes them to a callback.

function lines(callback: (a: string) => void) {

let unfinished = ''; // unfinished last line of chunk

return (data: string | Buffer) => {

const lines = data.toString().split(/\r?\n/);

const finishedLines = lines.slice(0, lines.length - 1);

finishedLines[0] = unfinished + finishedLines[0]; // complete previous unfinished line

unfinished = lines[lines.length - 1]; // remember unfinished last line of this chunk for next round

for (const s of finishedLines) {

callback(s);

}

};

}

return new Promise((resolve, reject) => {

let proc: ChildProcess;

if (process.platform === 'win32') {

// attributes columns are in alphabetic order!

const CMD_PAT = /^(.*)\s+([0-9]+)\.[0-9]+[+-][0-9]+\s+([0-9]+)\s+([0-9]+)$/;

const wmic = join(process.env['WINDIR'] || 'C:\\Windows', 'System32', 'wbem', 'WMIC.exe');

proc = spawn(wmic, [ 'process', 'get', 'CommandLine,CreationDate,ParentProcessId,ProcessId' ]);

proc.stdout?.setEncoding('utf8');

proc.stdout?.on('data', lines(line => {

let matches = CMD_PAT.exec(line.trim());

if (matches && matches.length === 5) {

const pid = Number(matches[4]);

const ppid = Number(matches[3]);

const date = Number(matches[2]);

let args = matches[1].trim();

if (!isNaN(pid) && !isNaN(ppid) && args) {

let command = args;

if (args[0] === '"') {

const end = args.indexOf('"', 1);

if (end > 0) {

command = args.substr(1, end-1);

args = args.substr(end + 2);

}

} else {

const end = args.indexOf(' ');

if (end > 0) {

command = args.substr(0, end);

args = args.substr(end + 1);

} else {

args = '';

}

}

one(pid, ppid, command, args, date);

}

}

}));

} else if (process.platform === 'darwin') { // OS X

proc = spawn('/bin/ps', [ '-x', '-o', `pid,ppid,comm=${'a'.repeat(256)},command` ]);

proc.stdout?.setEncoding('utf8');

proc.stdout?.on('data', lines(line => {

const pid = Number(line.substr(0, 5));

const ppid = Number(line.substr(6, 5));

const command = line.substr(12, 256).trim();

const args = line.substr(269 + command.length);

if (!isNaN(pid) && !isNaN(ppid)) {

one(pid, ppid, command, args);

}

}));

} else { // linux

proc = spawn('/bin/ps', [ '-ax', '-o', 'pid,ppid,comm:20,command' ]);

proc.stdout?.setEncoding('utf8');

proc.stdout?.on('data', lines(line => {

const pid = Number(line.substr(0, 5));

const ppid = Number(line.substr(6, 5));

let command = line.substr(12, 20).trim();

let args = line.substr(33);

let pos = args.indexOf(command);

if (pos >= 0) {

pos = pos + command.length;

while (pos < args.length) {

if (args[pos] === ' ') {

break;

}

pos++;

}

command = args.substr(0, pos);

args = args.substr(pos + 1);

}

if (!isNaN(pid) && !isNaN(ppid)) {

one(pid, ppid, command, args);

}

}));

}

proc.on('error', err => {

reject(err);

});

proc.stderr?.setEncoding('utf8');

proc.stderr?.on('data', data => {

const e = data.toString();

if (e.indexOf('screen size is bogus') >= 0) {

// ignore this error silently; see https://github.com/microsoft/vscode/issues/75932

} else {

reject(new Error(data.toString()));

}

});

proc.on('close', (code, signal) => {

if (code === 0) {

resolve();

} else if (code !== null && code > 0) {

reject(new Error(`process terminated with exit code: ${code}`));

}

if (signal) {

reject(new Error(`process terminated with signal: ${signal}`));

}

});

proc.on('exit', (code, signal) => {

if (typeof code === 'number') {

if (code === 0) {

//resolve();

} else if (code > 0) {

reject(new Error(`process terminated with exit code: ${code}`));

}

}

if (signal) {

reject(new Error(`process terminated with signal: ${signal}`));

}

});

});

}