smc-hub/smc-util-node/execute-code.map

CoCalc: Backend webserver component

{
  "version": 3,
  "file": "",
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    "/home/user/cocalc/src/smc-util-node/execute-code.coffee"
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    "#########################################################################\n# This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.\n# License: AGPLv3 s.t. \"Commons Clause\" – see LICENSE.md for details\n#########################################################################\n\n# Execute code in a subprocess, etc.\n\nwinston       = require('winston')\nwinston.remove(winston.transports.Console)\nwinston.add(winston.transports.Console, {level: 'debug', timestamp:true, colorize:true})\n\ntemp          = require('temp')\nasync         = require('async')\nfs            = require('fs')\nchild_process = require('child_process')\nshell_escape = require('shell-escape')\n\nmisc          = require('smc-util/misc')\n\n{walltime, defaults, required} = misc\n\n{aggregate}   = require('smc-util/aggregate')\n\nexports.execute_code = execute_code = aggregate (opts) ->\n    opts = defaults opts,\n        command    : required\n        args       : []\n        path       : undefined   # defaults to home directory; where code is executed from\n        timeout    : 10          # timeout in *seconds*\n        ulimit_timeout : true    # If set, use ulimit to ensure a cpu timeout -- don't use when launching a daemon!\n                                 # This has no effect if bash not true.\n        err_on_exit: true        # if true, then a nonzero exit code will result in cb(error_message)\n        max_output : undefined   # bound on size of stdout and stderr; further output ignored\n        bash       : false       # if true, ignore args and evaluate command as a bash command\n        home       : undefined\n        uid        : undefined\n        gid        : undefined\n        env        : undefined   # if given, added to exec environment\n        aggregate  : undefined   # if given, aggregates multiple calls with same sequence number into one -- see smc-util/aggregate; typically make this a timestamp for compiling code.\n        verbose    : true\n        cb         : undefined\n\n    start_time = walltime()\n    if opts.verbose\n        winston.debug(\"execute_code: \\\"#{opts.command} #{opts.args.join(' ')}\\\"\")\n\n    s = opts.command.split(/\\s+/g) # split on whitespace\n    if opts.args.length == 0 and s.length > 1\n        opts.bash = true\n    else if opts.bash and opts.args.length > 0\n        # Selected bash, but still passed in args.\n        opts.command = shell_escape([opts.command].concat(opts.args))\n        opts.args = []\n\n    if not opts.home?\n        opts.home = process.env.HOME\n\n    if not opts.path?\n        opts.path = opts.home\n    else if opts.path[0] != '/'\n        opts.path = opts.home + '/' + opts.path\n\n    stdout = ''\n    stderr = ''\n    exit_code = undefined\n\n    env = misc.copy(process.env)\n\n    if opts.env?\n        for k, v of opts.env\n            env[k] = v\n\n    if opts.uid?\n        env.HOME = opts.home\n\n    ran_code = false\n    info = undefined\n\n    async.series([\n        (c) ->\n            if not opts.bash\n                c()\n                return\n            if opts.timeout and opts.ulimit_timeout\n                # This ensures that everything involved with this\n                # command really does die no matter what; it's\n                # better than killing from outside, since it gets\n                # all subprocesses since they inherit the limits.\n                cmd = \"ulimit -t #{opts.timeout}\\n#{opts.command}\"\n            else\n                cmd = opts.command\n\n            if opts.verbose\n                winston.debug(\"execute_code: writing temporary file that contains bash program.\")\n            temp.open '', (err, _info) ->\n                if err\n                    c(err)\n                else\n                    info = _info\n                    opts.command = 'bash'\n                    opts.args    = [info.path]\n                    fs.writeFile(info.fd, cmd, c)\n        (c) ->\n            if info?\n                fs.close(info.fd, c)\n            else\n                c()\n        (c) ->\n            if info?\n                fs.chmod(info.path, 0o700, c)\n            else\n                c()\n\n        (c) ->\n            if opts.verbose\n                winston.debug(\"Spawning the command #{opts.command} with given args #{opts.args} and timeout of #{opts.timeout}s...\")\n            o = {cwd:opts.path}\n            if env?\n                o.env = env\n            if opts.uid\n                o.uid = opts.uid\n            if opts.gid\n                o.gid = opts.gid\n\n            try\n                r = child_process.spawn(opts.command, opts.args, o)\n                if not r.stdout? or not r.stderr?\n                    # The docs/examples at https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options\n                    # suggest that r.stdout and r.stderr are always defined.  However, this is\n                    # definitely NOT the case in edge cases, as we have observed.\n                    c(\"error creating child process -- couldn't spawn child process\")\n                    return\n            catch e\n                # Yes, spawn can cause this error if there is no memory, and there's no event! --  Error: spawn ENOMEM\n                ran_code = false\n                c(\"error #{misc.to_json(e)}\")\n                return\n\n            ran_code = true\n\n            if opts.verbose\n                winston.debug(\"Listen for stdout, stderr and exit events.\")\n            stdout = ''\n            r.stdout.on 'data', (data) ->\n                data = data.toString()\n                if opts.max_output?\n                    if stdout.length < opts.max_output\n                        stdout += data.slice(0,opts.max_output - stdout.length)\n                else\n                    stdout += data\n\n            r.stderr.on 'data', (data) ->\n                data = data.toString()\n                if opts.max_output?\n                    if stderr.length < opts.max_output\n                        stderr += data.slice(0,opts.max_output - stderr.length)\n                else\n                    stderr += data\n\n            stderr_is_done = stdout_is_done = false\n\n            r.stderr.on 'end', ->\n                stderr_is_done = true\n                finish()\n\n            r.stdout.on 'end', ->\n                stdout_is_done = true\n                finish()\n\n            r.on 'exit', (code) ->\n                exit_code = code\n                finish()\n\n            # This can happen, e.g., \"Error: spawn ENOMEM\" if there is no memory.  Without this handler,\n            # an unhandled exception gets raised, which is nasty.\n            # From docs: \"Note that the exit-event may or may not fire after an error has occured. \"\n            r.on 'error', (err) ->\n                if not exit_code?\n                    exit_code = 1\n                stderr += misc.to_json(err)\n                # a fundamental issue, we were not running some code\n                ran_code = false\n                finish()\n\n            callback_done = false\n            finish = ->\n                if stdout_is_done and stderr_is_done and exit_code?\n                    if opts.err_on_exit and exit_code != 0\n                        if not callback_done\n                            callback_done = true\n                            c(\"command '#{opts.command}' (args=#{opts.args.join(' ')}) exited with nonzero code #{exit_code} -- stderr='#{stderr}'\")\n                    else if not ran_code # regardless of opts.err_on_exit !\n                        if not callback_done\n                            callback_done = true\n                            c(\"command '#{opts.command}' (args=#{opts.args.join(' ')}) was not able to run -- stderr='#{stderr}'\")\n                    else\n                        if opts.max_output?\n                            if stdout.length >= opts.max_output\n                                stdout += \" (truncated at #{opts.max_output} characters)\"\n                            if stderr.length >= opts.max_output\n                                stderr += \" (truncated at #{opts.max_output} characters)\"\n                        if not callback_done\n                            callback_done = true\n                            c()\n\n            if opts.timeout\n                f = ->\n                    if r.exitCode == null\n                        if opts.verbose\n                            winston.debug(\"execute_code: subprocess did not exit after #{opts.timeout} seconds, so killing with SIGKILL\")\n                        try\n                            r.kill(\"SIGKILL\")  # this does not kill the process group :-(\n                        catch e\n                            # Exceptions can happen, which left uncaught messes up calling code bigtime.\n                            if opts.verbose\n                                winston.debug(\"execute_code: r.kill raised an exception.\")\n                        if not callback_done\n                            callback_done = true\n                            c(\"killed command '#{opts.command} #{opts.args.join(' ')}'\")\n                setTimeout(f, opts.timeout*1000)\n        (c) ->\n            if info?.path?\n                # Do not litter:\n                fs.unlink(info.path, c)\n            else\n                c()\n    ], (err) ->\n        if not exit_code?\n            exit_code = 1  # don't have one due to SIGKILL\n\n        # This log message is very dangerous, e.g., it could print out a secret_token to a log file.\n        # So it commented out.  Only include for low level debugging.\n        # winston.debug(\"(time: #{walltime() - start_time}): Done running '#{opts.command} #{opts.args.join(' ')}'; resulted in stdout='#{misc.trunc(stdout,512)}', stderr='#{misc.trunc(stderr,512)}', exit_code=#{exit_code}, err=#{err}\")\n\n        if opts.verbose\n            winston.debug(\"finished exec of #{opts.command} (took #{walltime(start_time)}s)\")\n            winston.debug(\"stdout='#{misc.trunc(stdout,512)}', stderr='#{misc.trunc(stderr,512)}', exit_code=#{exit_code}\")\n        if (not opts.err_on_exit) and ran_code\n            # as long as we made it to running some code, we consider this a success (that is what err_on_exit means).\n            opts.cb?(false, {stdout:stdout, stderr:stderr, exit_code:exit_code})\n        else\n            opts.cb?(err, {stdout:stdout, stderr:stderr, exit_code:exit_code})\n    )\n\n\n"
  ]
}