text: 'use strict';
  
  const vm = require('vm');
  const net = require('net');
  const os = require('os');
  const fs = require('fs');
  let contexts = {};
  let process_exit = false;
  
  /*** circular-json, originally taken from https://raw.githubusercontent.com/WebReflection/circular-json/
   Copyright (C) 2013-2017 by Andrea Giammarchi - @WebReflection
  
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
  
   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.
  
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.
  
   ***
  
   the original version has been restructured and modified to fit in here,
   only stringify is used, unused parts removed.
  
   */
  
  const CircularJSON = {};
  CircularJSON.specialChar = '~';
  CircularJSON.safeSpecialChar =  '\\x' + ('0' + CircularJSON.specialChar.charCodeAt(0).toString(16)).slice(-2);
  CircularJSON.escapedSafeSpecialChar = '\\' + CircularJSON.safeSpecialChar;
  CircularJSON.specialCharRG = new RegExp(CircularJSON.safeSpecialChar, 'g');
  CircularJSON.indexOf = [].indexOf || function(v){
      for(let i=this.length;i--&&this[i]!==v;);
      return i;
    };
  
  CircularJSON.generateReplacer = function (value, replacer, resolve) {
      let
          doNotIgnore = false,
          inspect = !!replacer,
          path = [],
          all  = [value],
          seen = [value],
          mapp = [resolve ? CircularJSON.specialChar : '[Circular]'],
          last = value,
          lvl  = 1,
          i, fn
      ;
      if (inspect) {
        fn = typeof replacer === 'object' ?
            function (key, value) {
              return key !== '' && CircularJSON.indexOf.call(replacer, key) < 0 ? void 0 : value;
            } :
            replacer;
      }
      return function(key, value) {
        // the replacer has rights to decide
        // if a new object should be returned
        // or if there's some key to drop
        // let's call it here rather than "too late"
        if (inspect) value = fn.call(this, key, value);
  
        // first pass should be ignored, since it's just the initial object
        if (doNotIgnore) {
          if (last !== this) {
            i = lvl - CircularJSON.indexOf.call(all, this) - 1;
            lvl -= i;
            all.splice(lvl, all.length);
            path.splice(lvl - 1, path.length);
            last = this;
          }
          // console.log(lvl, key, path);
          if (typeof value === 'object' && value) {
            // if object isn't referring to parent object, add to the
            // object path stack. Otherwise it is already there.
            if (CircularJSON.indexOf.call(all, value) < 0) {
              all.push(last = value);
            }
            lvl = all.length;
            i = CircularJSON.indexOf.call(seen, value);
            if (i < 0) {
              i = seen.push(value) - 1;
              if (resolve) {
                // key cannot contain specialChar but could be not a string
                path.push(('' + key).replace(CircularJSON.specialCharRG, CircularJSON.safeSpecialChar));
                mapp[i] = CircularJSON.specialChar + path.join(CircularJSON.specialChar);
              } else {
                mapp[i] = mapp[0];
              }
            } else {
              value = mapp[i];
            }
          } else {
            if (typeof value === 'string' && resolve) {
              // ensure no special char involved on deserialization
              // in this case only first char is important
              // no need to replace all value (better performance)
              value = value
                  .replace(CircularJSON.safeSpecialChar, CircularJSON.escapedSafeSpecialChar)
                  .replace(CircularJSON.specialChar, CircularJSON.safeSpecialChar);
            }
          }
        } else {
          doNotIgnore = true;
        }
        return value;
      };
    };
  CircularJSON.stringify = function stringify(value, replacer, space, doNotResolve) {
      return JSON.stringify(
          value,
          CircularJSON.generateReplacer(value, replacer, !doNotResolve),
          space
      );
    };
  /*** end of circular-json ***/
  
  function attachFunctionSource(responder_path, context, func) {
    return func + " = async function(...method_args) {\n\
      let context = \"" + context + "\";\n\
      let func = \"" + func +"\";\n\
      let request = [context, func, method_args];\n\
      let responder_path = '" + responder_path + "';\n\
      if (!global.__responder_socket) {\n\
        return new Promise(function(resolve, reject) {\n\
          setTimeout(function(){\n\
            if (os.platform().indexOf('win') == 0) {\n\
              let socket = net.connect(responder_path);\n\
              socket.on('connect', function(){\n\
                global.__responder_socket = true;\n\
                socket.destroy();\n\
                resolve(" + func + "(...method_args));\n\
              })\n\
              socket.on('error', function (err) {\n\
                resolve(" + func + "(...method_args));\n\
              });\n\
            } else {\n\
              if (fs.existsSync(responder_path)) { global.__responder_socket = true; }\n\
              resolve(" + func + "(...method_args));\n\
            }\n\
          }, 10)\n\
        });\n\
      }\n\
      return new Promise(function(resolve, reject) {\n\
        let request_json = JSON.stringify(request);\n\
        let buffer = Buffer.alloc(0);\n\
        let socket = net.connect(responder_path);\n\
        socket.setTimeout(2000);\n\
        socket.on('error', function (err) {\n\
            if (err.syscall === 'connect') {\n\
              // ignore, close will handle\n\
            } else if ((os.platform().indexOf('win') == 0) && err.message.includes('read EPIPE')) {\n\
              // ignore, close will handle\n\
            } else if ((os.platform().indexOf('win') == 0) && err.message.includes('write EPIPE')) {\n\
              // ignore, close will handle\n\
            } else { reject(err); }\n\
        });\n\
        socket.on('ready', function () {\n\
            socket.write(request_json + \"\x04\");\n\
        });\n\
        socket.on('data', function (data) {\n\
            buffer = Buffer.concat([buffer, data]);\n\
        });\n\
        socket.on('timeout', function() {\n\
            socket.destroy();\n\
            reject();\n\
        });\n\
        socket.on('close', function() {\n\
          if (buffer.length > 0) {\n\
              let method_result = JSON.parse(buffer.toString('utf8'));\n\
              if (method_result[0] == 'err') {\n\
                reject(method_result);\n\
              } else {\n\
                resolve(method_result[1]);\n\
              }\n\
          } else {\n\
            resolve(null);\n\
          }\n\
        });\n\
      });\n\
    }\n";
  }
  
  function createCompatibleContext(uuid, options) {
      let c = vm.createContext();
      vm.runInContext('delete this.console', c, "(execjs)");
      contexts[uuid] = { context: c, options: options };
      return c;
  }
  
  function createPermissiveContext(uuid, options) {
      let c = vm.createContext({ __responder_socket: false, process: { release: { name: "node" }, env: process.env }, Buffer, clearTimeout, fs, net, os, require, setTimeout });
      vm.runInContext('global = globalThis;', c);
      contexts[uuid] = { context: c, options: options };
      return c;
  }
  
  function formatResult(result) {
    if (typeof result === 'undefined' && result !== null) { return ['ok']; }
    else {
        try { return ['ok', result]; }
        catch (err) { return ['err', ['', err].join(''), err.stack]; }
    }
  }
  
  function getContext(uuid) {
    if (contexts[uuid]) { return contexts[uuid].context; }
    else { return null; }
  }
  
  function getContextOptions(uuid) {
    let options = { filename: "(execjs)", displayErrors: true };
    if (contexts[uuid].options.timeout) {
      options.timeout = contexts[uuid].options.timeout;
    }
    return options;
  }
  
  function massageStackTrace(stack) {
    if (stack && stack.indexOf("SyntaxError") == 0) {
        return "(execjs):1\n" + stack;
    } else {
        return stack;
    }
  }
  
  let socket_path = process.env.SOCKET_PATH;
  if (!socket_path) { throw 'No SOCKET_PATH given!'; };
  
  let commands = {
      attach: function(input) {
        let context = getContext(input.context);
        let responder_path;
        if (os.platform().indexOf('win') == 0) { responder_path = '\\\\\\\\.\\\\pipe\\\\' + socket_path + '_responder'; }
        else { responder_path = socket_path + '_responder' }
        let result = vm.runInContext(attachFunctionSource(responder_path, input.context, input.func), context, { filename: "(execjs)", displayErrors: true });
        return formatResult(result);
      },
      create: function (input) {
        let context = createCompatibleContext(input.context, input.options);
        let result = vm.runInContext(input.source, context, getContextOptions(input.context));
        return formatResult(result);
      },
      createp: function (input) {
        let context = createPermissiveContext(input.context, input.options);
        let result = vm.runInContext(input.source, context, getContextOptions(input.context));
        return formatResult(result);
      },
      deleteContext: function(uuid) {
          delete contexts[uuid];
          return [1];
      },
      exit: function(code) {
          process_exit = code;
          return ['ok'];
      },
      exec: function (input) {
          let result = vm.runInContext(input.source, getContext(input.context), getContextOptions(input.context));
          return formatResult(result);
      },
      eval: function (input) {
        if (input.source.match(/^\s*{/)) { input.source = "(" + input.source + ")"; }
        else if (input.source.match(/^\s*function\s*\(/)) { input.source = "(" + input.source + ")"; }
        let result = vm.runInContext(input.source, getContext(input.context), getContextOptions(input.context));
        return formatResult(result);
      },
      // ctxo: function (input) {
      //   return formatResult(getContextOptions(input.context));
      // },
  };
  
  let server = net.createServer(function(s) {
      let received_data = [];
  
      s.on('data', function (data) {
          received_data.push(data);
          if (data[data.length - 1] !== 4) { return; }
  
          let request = received_data.join('').toString('utf8');
          request = request.substr(0, request.length - 1);
          received_data = [];
  
          let input, result;
          let outputJSON = '';
  
          try { input = JSON.parse(request); }
          catch(err) {
            outputJSON = JSON.stringify(['err', ['', err].join(''), err.stack]);
            s.write([outputJSON, "\x04"].join(''));
            return;
          }
  
          try { result = commands[input.cmd].apply(null, input.args); }
          catch (err) {
            outputJSON = JSON.stringify(['err', ['', err].join(''), massageStackTrace(err.stack)]);
            s.write([outputJSON, "\x04"].join(''));
            return;
          }
  
          try { outputJSON = JSON.stringify(result); }
          catch(err) {
              if (err.message.includes('circular')) { outputJSON = CircularJSON.stringify(result); }
              else { outputJSON = JSON.stringify([['', err].join(''), err.stack]); }
              s.write([outputJSON, "\x04"].join(''));
              if (process_exit !== false) { process.exit(process_exit); }
              return;
          }
  
          try { s.write([outputJSON, "\x04"].join('')); }
          catch (err) {}
          if (process_exit !== false) { process.exit(process_exit); }
      });
  });
  
  if (os.platform().indexOf('win') == 0) { server.listen('\\\\.\\pipe\\' + socket_path); }
  else { server.listen(socket_path); }
  