server session now local

12 files changed, 1072 insertions, 377 deletions

diff --git a/package-lock.json b/package-lock.json
index 0b8bd140c..f38f23acb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -374,7 +374,8 @@
         "@types/chai": {
             "version": "4.2.7",
             "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.7.tgz",
-            "integrity": "sha512-luq8meHGYwvky0O7u0eQZdA7B4Wd9owUCqvbw2m3XCrCU8mplYOujMBbvyS547AxJkC+pGnd0Cm15eNxEUNU8g=="
+            "integrity": "sha512-luq8meHGYwvky0O7u0eQZdA7B4Wd9owUCqvbw2m3XCrCU8mplYOujMBbvyS547AxJkC+pGnd0Cm15eNxEUNU8g==",
+            "dev": true
         },
         "@types/classnames": {
             "version": "2.2.9",
@@ -602,7 +603,8 @@
         "@types/mocha": {
             "version": "5.2.7",
             "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.7.tgz",
-            "integrity": "sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ=="
+            "integrity": "sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==",
+            "dev": true
         },
         "@types/mongodb": {
             "version": "3.3.14",
@@ -1995,7 +1997,7 @@
                 },
                 "util": {
                     "version": "0.10.3",
-                    "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+                    "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
                     "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
                     "dev": true,
                     "requires": {
@@ -5417,8 +5419,8 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "delegates": "1.0.0",
-                        "readable-stream": "2.3.6"
+                        "delegates": "^1.0.0",
+                        "readable-stream": "^2.0.6"
                     }
                 },
                 "balanced-match": {
@@ -5501,14 +5503,14 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "aproba": "1.2.0",
-                        "console-control-strings": "1.1.0",
-                        "has-unicode": "2.0.1",
-                        "object-assign": "4.1.1",
-                        "signal-exit": "3.0.2",
-                        "string-width": "1.0.2",
-                        "strip-ansi": "3.0.1",
-                        "wide-align": "1.1.3"
+                        "aproba": "^1.0.3",
+                        "console-control-strings": "^1.0.0",
+                        "has-unicode": "^2.0.0",
+                        "object-assign": "^4.1.0",
+                        "signal-exit": "^3.0.0",
+                        "string-width": "^1.0.1",
+                        "strip-ansi": "^3.0.1",
+                        "wide-align": "^1.1.0"
                     }
                 },
                 "glob": {
@@ -5516,12 +5518,12 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "fs.realpath": "1.0.0",
-                        "inflight": "1.0.6",
-                        "inherits": "2.0.4",
-                        "minimatch": "3.0.4",
-                        "once": "1.4.0",
-                        "path-is-absolute": "1.0.1"
+                        "fs.realpath": "^1.0.0",
+                        "inflight": "^1.0.4",
+                        "inherits": "2",
+                        "minimatch": "^3.0.4",
+                        "once": "^1.3.0",
+                        "path-is-absolute": "^1.0.0"
                     }
                 },
                 "has-unicode": {
@@ -5550,8 +5552,8 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "once": "1.4.0",
-                        "wrappy": "1.0.2"
+                        "once": "^1.3.0",
+                        "wrappy": "1"
                     }
                 },
                 "inherits": {
@@ -5683,10 +5685,10 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "are-we-there-yet": "1.1.5",
-                        "console-control-strings": "1.1.0",
-                        "gauge": "2.7.4",
-                        "set-blocking": "2.0.0"
+                        "are-we-there-yet": "~1.1.2",
+                        "console-control-strings": "~1.1.0",
+                        "gauge": "~2.7.3",
+                        "set-blocking": "~2.0.0"
                     }
                 },
                 "number-is-nan": {
@@ -5704,7 +5706,7 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "wrappy": "1.0.2"
+                        "wrappy": "1"
                     }
                 },
                 "os-homedir": {
@@ -5741,10 +5743,10 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "deep-extend": "0.6.0",
-                        "ini": "1.3.5",
-                        "minimist": "1.2.0",
-                        "strip-json-comments": "2.0.1"
+                        "deep-extend": "^0.6.0",
+                        "ini": "~1.3.0",
+                        "minimist": "^1.2.0",
+                        "strip-json-comments": "~2.0.1"
                     },
                     "dependencies": {
                         "minimist": {
@@ -5759,13 +5761,13 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "core-util-is": "1.0.2",
-                        "inherits": "2.0.4",
-                        "isarray": "1.0.0",
-                        "process-nextick-args": "2.0.1",
-                        "safe-buffer": "5.1.2",
-                        "string_decoder": "1.1.1",
-                        "util-deprecate": "1.0.2"
+                        "core-util-is": "~1.0.0",
+                        "inherits": "~2.0.3",
+                        "isarray": "~1.0.0",
+                        "process-nextick-args": "~2.0.0",
+                        "safe-buffer": "~5.1.1",
+                        "string_decoder": "~1.1.1",
+                        "util-deprecate": "~1.0.1"
                     }
                 },
                 "rimraf": {
@@ -5811,9 +5813,9 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "code-point-at": "1.1.0",
-                        "is-fullwidth-code-point": "1.0.0",
-                        "strip-ansi": "3.0.1"
+                        "code-point-at": "^1.0.0",
+                        "is-fullwidth-code-point": "^1.0.0",
+                        "strip-ansi": "^3.0.0"
                     }
                 },
                 "string_decoder": {
@@ -5861,7 +5863,7 @@
                     "bundled": true,
                     "optional": true,
                     "requires": {
-                        "string-width": "1.0.2"
+                        "string-width": "^1.0.2 || 2"
                     }
                 },
                 "wrappy": {
@@ -12629,11 +12631,6 @@
             "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
             "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
         },
-        "picomatch": {
-            "version": "2.2.1",
-            "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.1.tgz",
-            "integrity": "sha512-ISBaA8xQNmwELC7eOjqFKMESB2VIqt4PPDD0nsS95b/9dZXvVKOlz9keMSnoGGKcOHXfTvDD6WMaRoSc9UuhRA=="
-        },
         "pify": {
             "version": "2.3.0",
             "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
@@ -14249,334 +14246,6 @@
             "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
             "dev": true
         },
-        "resilient-server-session": {
-            "version": "1.1.9",
-            "resolved": "https://registry.npmjs.org/resilient-server-session/-/resilient-server-session-1.1.9.tgz",
-            "integrity": "sha512-XSVujTyJOQMACllXUvWOSHY4GK4JI6aECjCrQR0UBvd2+hdjM1euffspn2b+7M0fepo+bJ71YrAOA9M34ChBZw==",
-            "requires": {
-                "@types/chai": "^4.2.7",
-                "@types/express": "^4.17.2",
-                "@types/mocha": "^5.2.7",
-                "@types/node": "^10.12.30",
-                "@types/request-promise": "^4.1.42",
-                "@types/uuid": "^3.4.6",
-                "chai": "^4.2.0",
-                "colors": "^1.4.0",
-                "express": "^4.17.1",
-                "jsonschema": "^1.2.5",
-                "mocha": "^7.0.0",
-                "request": "^2.88.0",
-                "request-promise": "^4.2.5",
-                "typescript": "^3.7.4",
-                "uuid": "^3.3.3"
-            },
-            "dependencies": {
-                "ansi-colors": {
-                    "version": "3.2.3",
-                    "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
-                    "integrity": "sha512-LEHHyuhlPY3TmuUYMh2oz89lTShfvgbmzaBcxve9t/9Wuy7Dwf4yoAKcND7KFT1HAQfqZ12qtc+DUrBMeKF9nw=="
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-                "ansi-regex": {
-                    "version": "4.1.0",
-                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-                    "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
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-                        "is-fullwidth-code-point": "^2.0.0",
-                        "strip-ansi": "^5.1.0"
-                    }
-                },
-                "strip-ansi": {
-                    "version": "5.2.0",
-                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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-                    "requires": {
-                        "ansi-regex": "^4.1.0"
-                    }
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-                "supports-color": {
-                    "version": "6.0.0",
-                    "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.0.0.tgz",
-                    "integrity": "sha512-on9Kwidc1IUQo+bQdhi8+Tijpo0e1SS6RoGo2guUwn5vdaxw8RXOF9Vb2ws+ihWOmh4JnCJOvaziZWP1VABaLg==",
-                    "requires": {
-                        "has-flag": "^3.0.0"
-                    }
-                },
-                "to-regex-range": {
-                    "version": "5.0.1",
-                    "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
-                    "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-                    "requires": {
-                        "is-number": "^7.0.0"
-                    }
-                },
-                "which-module": {
-                    "version": "2.0.0",
-                    "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-                    "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
-                },
-                "wrap-ansi": {
-                    "version": "5.1.0",
-                    "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
-                    "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
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-                "y18n": {
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-                    "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
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-                    "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
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-                        "set-blocking": "^2.0.0",
-                        "string-width": "^3.0.0",
-                        "which-module": "^2.0.0",
-                        "y18n": "^4.0.0",
-                        "yargs-parser": "^13.1.1"
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-                "yargs-parser": {
-                    "version": "13.1.1",
-                    "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
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-                    "requires": {
-                        "camelcase": "^5.0.0",
-                        "decamelize": "^1.2.0"
-                    }
-                }
-            }
-        },
         "resize-observer-polyfill": {
             "version": "1.5.1",
             "resolved": "https://registry.npmjs.org/resize-observer-polyfill/-/resize-observer-polyfill-1.5.1.tgz",
diff --git a/package.json b/package.json
index 250509e80..6f54023d6 100644
--- a/package.json
+++ b/package.json
@@ -222,7 +222,6 @@
         "readline": "^1.3.0",
         "request": "^2.88.0",
         "request-promise": "^4.2.5",
-        "resilient-server-session": "^1.1.9",
         "rimraf": "^3.0.0",
         "serializr": "^1.5.4",
         "sharp": "^0.23.4",
diff --git a/src/server/DashSession/DashSessionAgent.ts b/src/server/DashSession/DashSessionAgent.ts
index d61e9aac1..85bfe14de 100644
--- a/src/server/DashSession/DashSessionAgent.ts
+++ b/src/server/DashSession/DashSessionAgent.ts
@@ -8,8 +8,11 @@ import { launchServer, onWindows } from "..";
 import { readdirSync, statSync, createWriteStream, readFileSync, unlinkSync } from "fs";
 import * as Archiver from "archiver";
 import { resolve } from "path";
-import { AppliedSessionAgent, MessageHandler, ExitHandler, Monitor, ServerWorker } from "resilient-server-session";
 import rimraf = require("rimraf");
+import { AppliedSessionAgent, ExitHandler } from "./Session/agents/applied_session_agent";
+import { ServerWorker } from "./Session/agents/server_worker";
+import { Monitor } from "./Session/agents/monitor";
+import { MessageHandler } from "./Session/agents/promisified_ipc_manager";
 
 /**
  * If we're the monitor (master) thread, we should launch the monitor logic for the session.
diff --git a/src/server/DashSession/Session/agents/applied_session_agent.ts b/src/server/DashSession/Session/agents/applied_session_agent.ts
new file mode 100644
index 000000000..46c9e22ed
--- /dev/null
+++ b/src/server/DashSession/Session/agents/applied_session_agent.ts
@@ -0,0 +1,58 @@
+import { isMaster } from "cluster";
+import { Monitor } from "./monitor";
+import { ServerWorker } from "./server_worker";
+import { Utilities } from "../utilities/utilities";
+
+export type ExitHandler = (reason: Error | boolean) => void | Promise<void>;
+
+export abstract class AppliedSessionAgent {
+
+    // the following two methods allow the developer to create a custom
+    // session and use the built in customization options for each thread
+    protected abstract async initializeMonitor(monitor: Monitor): Promise<string>;
+    protected abstract async initializeServerWorker(): Promise<ServerWorker>;
+
+    private launched = false;
+
+    public killSession = (reason: string, graceful = true, errorCode = 0) => {
+        const target = isMaster ? this.sessionMonitor : this.serverWorker;
+        target.killSession(reason, graceful, errorCode);
+    }
+
+    private sessionMonitorRef: Monitor | undefined;
+    public get sessionMonitor(): Monitor {
+        if (!isMaster) {
+            this.serverWorker.emit("kill", {
+                graceful: false,
+                reason: "Cannot access the session monitor directly from the server worker thread.",
+                errorCode: 1
+            });
+            throw new Error();
+        }
+        return this.sessionMonitorRef!;
+    }
+
+    private serverWorkerRef: ServerWorker | undefined;
+    public get serverWorker(): ServerWorker {
+        if (isMaster) {
+            throw new Error("Cannot access the server worker directly from the session monitor thread");
+        }
+        return this.serverWorkerRef!;
+    }
+
+    public async launch(): Promise<void> {
+        if (!this.launched) {
+            this.launched = true;
+            if (isMaster) {
+                this.sessionMonitorRef = Monitor.Create()
+                const sessionKey = await this.initializeMonitor(this.sessionMonitorRef);
+                this.sessionMonitorRef.finalize(sessionKey);
+            } else {
+                this.serverWorkerRef = await this.initializeServerWorker();
+            }
+        } else {
+            throw new Error("Cannot launch a session thread more than once per process.");
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/agents/monitor.ts b/src/server/DashSession/Session/agents/monitor.ts
new file mode 100644
index 000000000..1d4ea6fb5
--- /dev/null
+++ b/src/server/DashSession/Session/agents/monitor.ts
@@ -0,0 +1,298 @@
+import { ExitHandler } from "./applied_session_agent";
+import { Configuration, configurationSchema, defaultConfig, Identifiers, colorMapping } from "../utilities/session_config";
+import Repl, { ReplAction } from "../utilities/repl";
+import { isWorker, setupMaster, on, Worker, fork } from "cluster";
+import { manage, MessageHandler } from "./promisified_ipc_manager";
+import { red, cyan, white, yellow, blue } from "colors";
+import { exec, ExecOptions } from "child_process";
+import { validate, ValidationError } from "jsonschema";
+import { Utilities } from "../utilities/utilities";
+import { readFileSync } from "fs";
+import IPCMessageReceiver from "./process_message_router";
+import { ServerWorker } from "./server_worker";
+
+/**
+ * Validates and reads the configuration file, accordingly builds a child process factory
+ * and spawns off an initial process that will respawn as predecessors die.
+ */
+export class Monitor extends IPCMessageReceiver {
+    private static count = 0;
+    private finalized = false;
+    private exitHandlers: ExitHandler[] = [];
+    private readonly config: Configuration;
+    private activeWorker: Worker | undefined;
+    private key: string | undefined;
+    private repl: Repl;
+
+    public static Create() {
+        if (isWorker) {
+            ServerWorker.IPCManager.emit("kill", {
+                reason: "cannot create a monitor on the worker process.",
+                graceful: false,
+                errorCode: 1
+            });
+            process.exit(1);
+        } else if (++Monitor.count > 1) {
+            console.error(red("cannot create more than one monitor."));
+            process.exit(1);
+        } else {
+            return new Monitor();
+        }
+    }
+
+    private constructor() {
+        super();
+        console.log(this.timestamp(), cyan("initializing session..."));
+        this.configureInternalHandlers();
+        this.config = this.loadAndValidateConfiguration();
+        this.initializeClusterFunctions();
+        this.repl = this.initializeRepl();
+    }
+
+    protected configureInternalHandlers = () => {
+        // handle exceptions in the master thread - there shouldn't be many of these
+        // the IPC (inter process communication) channel closed exception can't seem
+        // to be caught in a try catch, and is inconsequential, so it is ignored
+        process.on("uncaughtException", ({ message, stack }): void => {
+            if (message !== "Channel closed") {
+                this.mainLog(red(message));
+                if (stack) {
+                    this.mainLog(`uncaught exception\n${red(stack)}`);
+                }
+            }
+        });
+
+        this.on("kill", ({ reason, graceful, errorCode }) => this.killSession(reason, graceful, errorCode));
+        this.on("lifecycle", ({ event }) => console.log(this.timestamp(), `${this.config.identifiers.worker.text} lifecycle phase (${event})`));
+    }
+
+    private initializeClusterFunctions = () => {
+        // determines whether or not we see the compilation / initialization / runtime output of each child server process
+        const output = this.config.showServerOutput ? "inherit" : "ignore";
+        setupMaster({ stdio: ["ignore", output, output, "ipc"] });
+
+        // a helpful cluster event called on the master thread each time a child process exits
+        on("exit", ({ process: { pid } }, code, signal) => {
+            const prompt = `server worker with process id ${pid} has exited with code ${code}${signal === null ? "" : `, having encountered signal ${signal}`}.`;
+            this.mainLog(cyan(prompt));
+            // to make this a robust, continuous session, every time a child process dies, we immediately spawn a new one
+            this.spawn();
+        });
+    }
+
+    public finalize = (sessionKey: string): void => {
+        if (this.finalized) {
+            throw new Error("Session monitor is already finalized");
+        }
+        this.finalized = true;
+        this.key = sessionKey;
+        this.spawn();
+    }
+
+    public readonly coreHooks = Object.freeze({
+        onCrashDetected: (listener: MessageHandler<{ error: Error }>) => this.on(Monitor.IntrinsicEvents.CrashDetected, listener),
+        onServerRunning: (listener: MessageHandler<{ isFirstTime: boolean }>) => this.on(Monitor.IntrinsicEvents.ServerRunning, listener)
+    });
+
+    /**
+     * Kill this session and its active child
+     * server process, either gracefully (may wait
+     * indefinitely, but at least allows active networking
+     * requests to complete) or immediately.
+     */
+    public killSession = async (reason: string, graceful = true, errorCode = 0) => {
+        this.mainLog(cyan(`exiting session ${graceful ? "clean" : "immediate"}ly`));
+        this.mainLog(`session exit reason: ${(red(reason))}`);
+        await this.executeExitHandlers(true);
+        await this.killActiveWorker(graceful, true);
+        process.exit(errorCode);
+    }
+
+    /**
+     * Execute the list of functions registered to be called
+     * whenever the process exits.
+     */
+    public addExitHandler = (handler: ExitHandler) => this.exitHandlers.push(handler);
+
+    /**
+     * Extend the default repl by adding in custom commands
+     * that can invoke application logic external to this module
+     */
+    public addReplCommand = (basename: string, argPatterns: (RegExp | string)[], action: ReplAction) => {
+        this.repl.registerCommand(basename, argPatterns, action);
+    }
+
+    public exec = (command: string, options?: ExecOptions) => {
+        return new Promise<void>(resolve => {
+            exec(command, { ...options, encoding: "utf8" }, (error, stdout, stderr) => {
+                if (error) {
+                    this.execLog(red(`unable to execute ${white(command)}`));
+                    error.message.split("\n").forEach(line => line.length && this.execLog(red(`(error) ${line}`)));
+                } else {
+                    let outLines: string[], errorLines: string[];
+                    if ((outLines = stdout.split("\n").filter(line => line.length)).length) {
+                        outLines.forEach(line => line.length && this.execLog(cyan(`(stdout) ${line}`)));
+                    }
+                    if ((errorLines = stderr.split("\n").filter(line => line.length)).length) {
+                        errorLines.forEach(line => line.length && this.execLog(yellow(`(stderr) ${line}`)));
+                    }
+                }
+                resolve();
+            });
+        });
+    }
+
+    /**
+     * Generates a blue UTC string associated with the time
+     * of invocation.
+     */
+    private timestamp = () => blue(`[${new Date().toUTCString()}]`);
+
+    /**
+     * A formatted, identified and timestamped log in color
+     */
+    public mainLog = (...optionalParams: any[]) => {
+        console.log(this.timestamp(), this.config.identifiers.master.text, ...optionalParams);
+    }
+
+    /**
+     * A formatted, identified and timestamped log in color for non-
+     */
+    private execLog = (...optionalParams: any[]) => {
+        console.log(this.timestamp(), this.config.identifiers.exec.text, ...optionalParams);
+    }
+
+    /**
+     * Reads in configuration .json file only once, in the master thread
+     * and pass down any variables the pertinent to the child processes as environment variables.
+     */
+    private loadAndValidateConfiguration = (): Configuration => {
+        let config: Configuration;
+        try {
+            console.log(this.timestamp(), cyan("validating configuration..."));
+            config = JSON.parse(readFileSync('./session.config.json', 'utf8'));
+            const options = {
+                throwError: true,
+                allowUnknownAttributes: false
+            };
+            // ensure all necessary and no excess information is specified by the configuration file
+            validate(config, configurationSchema, options);
+            config = Utilities.preciseAssign({}, defaultConfig, config);
+        } catch (error) {
+            if (error instanceof ValidationError) {
+                console.log(red("\nSession configuration failed."));
+                console.log("The given session.config.json configuration file is invalid.");
+                console.log(`${error.instance}: ${error.stack}`);
+                process.exit(0);
+            } else if (error.code === "ENOENT" && error.path === "./session.config.json") {
+                console.log(cyan("Loading default session parameters..."));
+                console.log("Consider including a session.config.json configuration file in your project root for customization.");
+                config = Utilities.preciseAssign({}, defaultConfig);
+            } else {
+                console.log(red("\nSession configuration failed."));
+                console.log("The following unknown error occurred during configuration.");
+                console.log(error.stack);
+                process.exit(0);
+            }
+        } finally {
+            const { identifiers } = config!;
+            Object.keys(identifiers).forEach(key => {
+                const resolved = key as keyof Identifiers;
+                const { text, color } = identifiers[resolved];
+                identifiers[resolved].text = (colorMapping.get(color) || white)(`${text}:`);
+            });
+            return config!;
+        }
+    }
+
+    /**
+     * Builds the repl that allows the following commands to be typed into stdin of the master thread.
+     */
+    private initializeRepl = (): Repl => {
+        const repl = new Repl({ identifier: () => `${this.timestamp()} ${this.config.identifiers.master.text}` });
+        const boolean = /true|false/;
+        const number = /\d+/;
+        const letters = /[a-zA-Z]+/;
+        repl.registerCommand("exit", [/clean|force/], args => this.killSession("manual exit requested by repl", args[0] === "clean", 0));
+        repl.registerCommand("restart", [/clean|force/], args => this.killActiveWorker(args[0] === "clean"));
+        repl.registerCommand("set", [letters, "port", number, boolean], args => this.setPort(args[0], Number(args[2]), args[3] === "true"));
+        repl.registerCommand("set", [/polling/, number, boolean], args => {
+            const newPollingIntervalSeconds = Math.floor(Number(args[1]));
+            if (newPollingIntervalSeconds < 0) {
+                this.mainLog(red("the polling interval must be a non-negative integer"));
+            } else {
+                if (newPollingIntervalSeconds !== this.config.polling.intervalSeconds) {
+                    this.config.polling.intervalSeconds = newPollingIntervalSeconds;
+                    if (args[2] === "true") {
+                        Monitor.IPCManager.emit("updatePollingInterval", { newPollingIntervalSeconds });
+                    }
+                }
+            }
+        });
+        return repl;
+    }
+
+    private executeExitHandlers = async (reason: Error | boolean) => Promise.all(this.exitHandlers.map(handler => handler(reason)));
+
+    /**
+     * Attempts to kill the active worker gracefully, unless otherwise specified.
+     */
+    private killActiveWorker = async (graceful = true, isSessionEnd = false): Promise<void> => {
+        if (this.activeWorker && !this.activeWorker.isDead()) {
+            if (graceful) {
+                Monitor.IPCManager.emit("manualExit", { isSessionEnd });
+            } else {
+                await ServerWorker.IPCManager.destroy();
+                this.activeWorker.process.kill();
+            }
+        }
+    }
+
+    /**
+     * Allows the caller to set the port at which the target (be it the server,
+     * the websocket, some other custom port) is listening. If an immediate restart
+     * is specified, this monitor will kill the active child and re-launch the server
+     * at the port. Otherwise, the updated port won't be used until / unless the child
+     * dies on its own and triggers a restart.
+     */
+    private setPort = (port: "server" | "socket" | string, value: number, immediateRestart: boolean): void => {
+        if (value > 1023 && value < 65536) {
+            this.config.ports[port] = value;
+            if (immediateRestart) {
+                this.killActiveWorker();
+            }
+        } else {
+            this.mainLog(red(`${port} is an invalid port number`));
+        }
+    }
+
+    /**
+     * Kills the current active worker and proceeds to spawn a new worker,
+     * feeding in configuration information as environment variables.
+     */
+    private spawn = async (): Promise<void> => {
+        await this.killActiveWorker();
+        const { config: { polling, ports }, key } = this;
+        this.activeWorker = fork({
+            pollingRoute: polling.route,
+            pollingFailureTolerance: polling.failureTolerance,
+            serverPort: ports.server,
+            socketPort: ports.socket,
+            pollingIntervalSeconds: polling.intervalSeconds,
+            session_key: key
+        });
+        Monitor.IPCManager = manage(this.activeWorker.process, this.handlers);
+        this.mainLog(cyan(`spawned new server worker with process id ${this.activeWorker?.process.pid}`));
+    }
+
+}
+
+export namespace Monitor {
+
+    export enum IntrinsicEvents {
+        KeyGenerated = "key_generated",
+        CrashDetected = "crash_detected",
+        ServerRunning = "server_running"
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/agents/process_message_router.ts b/src/server/DashSession/Session/agents/process_message_router.ts
new file mode 100644
index 000000000..6cc8aa941
--- /dev/null
+++ b/src/server/DashSession/Session/agents/process_message_router.ts
@@ -0,0 +1,41 @@
+import { MessageHandler, PromisifiedIPCManager, HandlerMap } from "./promisified_ipc_manager";
+
+export default abstract class IPCMessageReceiver {
+
+    protected static IPCManager: PromisifiedIPCManager;
+    protected handlers: HandlerMap = {};
+
+    protected abstract configureInternalHandlers: () => void;
+
+    /**
+     * Add a listener at this message. When the monitor process
+     * receives a message, it will invoke all registered functions.
+     */
+    public on = (name: string, handler: MessageHandler) => {
+        const handlers = this.handlers[name];
+        if (!handlers) {
+            this.handlers[name] = [handler];
+        } else {
+            handlers.push(handler);
+        }
+    }
+
+    /**
+     * Unregister a given listener at this message.
+     */
+    public off = (name: string, handler: MessageHandler) => {
+        const handlers = this.handlers[name];
+        if (handlers) {
+            const index = handlers.indexOf(handler);
+            if (index > -1) {
+                handlers.splice(index, 1);
+            }
+        }
+    }
+
+    /**
+     * Unregister all listeners at this message.
+     */
+    public clearMessageListeners = (...names: string[]) => names.map(name => delete this.handlers[name]);
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/agents/promisified_ipc_manager.ts b/src/server/DashSession/Session/agents/promisified_ipc_manager.ts
new file mode 100644
index 000000000..9f0db8330
--- /dev/null
+++ b/src/server/DashSession/Session/agents/promisified_ipc_manager.ts
@@ -0,0 +1,173 @@
+import { Utilities } from "../utilities/utilities";
+import { ChildProcess } from "child_process";
+
+/**
+ * Convenience constructor
+ * @param target the process / worker to which to attach the specialized listeners 
+ */
+export function manage(target: IPCTarget, handlers?: HandlerMap) {
+    return new PromisifiedIPCManager(target, handlers);
+}
+
+/**
+ * Captures the logic to execute upon receiving a message
+ * of a certain name.
+ */
+export type HandlerMap = { [name: string]: MessageHandler[] };
+
+/**
+ * This will always literally be a child process. But, though setting
+ * up a manager in the parent will indeed see the target as the ChildProcess,
+ * setting up a manager in the child will just see itself as a regular NodeJS.Process. 
+ */
+export type IPCTarget = NodeJS.Process | ChildProcess;
+
+/**
+ * Specifies a general message format for this API 
+ */
+export type Message<T = any> = {
+    name: string;
+    args?: T;
+};
+export type MessageHandler<T = any> = (args: T) => (any | Promise<any>);
+
+/**
+ * When a message is emitted, it is embedded with private metadata
+ * to facilitate the resolution of promises, etc.
+ */
+interface InternalMessage extends Message { metadata: Metadata }
+interface Metadata { isResponse: boolean; id: string }
+type InternalMessageHandler = (message: InternalMessage) => (any | Promise<any>);
+
+/**
+ * Allows for the transmission of the error's key features over IPC.
+ */
+export interface ErrorLike {
+    name?: string;
+    message?: string;
+    stack?: string;
+}
+
+/**
+ * The arguments returned in a message sent from the target upon completion.
+ */
+export interface Response<T = any> {
+    results?: T[];
+    error?: ErrorLike;
+}
+
+const destroyEvent = "__destroy__";
+
+/**
+ * This is a wrapper utility class that allows the caller process
+ * to emit an event and return a promise that resolves when it and all
+ * other processes listening to its emission of this event have completed. 
+ */
+export class PromisifiedIPCManager {
+    private readonly target: IPCTarget;
+    private pendingMessages: { [id: string]: string } = {};
+    private isDestroyed = false;
+    private get callerIsTarget() {
+        return process.pid === this.target.pid;
+    }
+
+    constructor(target: IPCTarget, handlers?: HandlerMap) {
+        this.target = target;
+        if (handlers) {
+            handlers[destroyEvent] = [this.destroyHelper];
+            this.target.addListener("message", this.generateInternalHandler(handlers));
+        }
+    }
+
+    /**
+     * This routine uniquely identifies each message, then adds a general
+     * message listener that waits for a response with the same id before resolving
+     * the promise.
+     */
+    public emit = async <T = any>(name: string, args?: any): Promise<Response<T>> => {
+        if (this.isDestroyed) {
+            const error = { name: "FailedDispatch", message: "Cannot use a destroyed IPC manager to emit a message." };
+            return { error };
+        }
+        return new Promise<Response<T>>(resolve => {
+            const messageId = Utilities.guid();
+            const responseHandler: InternalMessageHandler = ({ metadata: { id, isResponse }, args }) => {
+                if (isResponse && id === messageId) {
+                    this.target.removeListener("message", responseHandler);
+                    resolve(args);
+                }
+            };
+            this.target.addListener("message", responseHandler);
+            const message = { name, args, metadata: { id: messageId, isResponse: false } };
+            if (!(this.target.send && this.target.send(message))) {
+                const error: ErrorLike = { name: "FailedDispatch", message: "Either the target's send method was undefined or the act of sending failed." };
+                resolve({ error });
+                this.target.removeListener("message", responseHandler);
+            }
+        });
+    }
+
+    /**
+     * Invoked from either the parent or the child process, this allows
+     * any unresolved promises to continue in the target process, but dispatches a dummy
+     * completion response for each of the pending messages, allowing their
+     * promises in the caller to resolve.
+     */
+    public destroy = () => {
+        return new Promise<void>(async resolve => {
+            if (this.callerIsTarget) {
+                this.destroyHelper();
+            } else {
+                await this.emit(destroyEvent);
+            }
+            resolve();
+        });
+    }
+
+    /**
+     * Dispatches the dummy responses and sets the isDestroyed flag to true.
+     */
+    private destroyHelper = () => {
+        const { pendingMessages } = this;
+        this.isDestroyed = true;
+        Object.keys(pendingMessages).forEach(id => {
+            const error: ErrorLike = { name: "ManagerDestroyed", message: "The IPC manager was destroyed before the response could be returned." };
+            const message: InternalMessage = { name: pendingMessages[id], args: { error }, metadata: { id, isResponse: true } };
+            this.target.send?.(message)
+        });
+        this.pendingMessages = {};
+    }
+
+    /**
+     * This routine receives a uniquely identified message. If the message is itself a response,
+     * it is ignored to avoid infinite mutual responses. Otherwise, the routine awaits its completion using whatever
+     * router the caller has installed, and then sends a response containing the original message id,
+     * which will ultimately invoke the responseHandler of the original emission and resolve the
+     * sender's promise.
+     */
+    private generateInternalHandler = (handlers: HandlerMap): MessageHandler => async (message: InternalMessage) => {
+        const { name, args, metadata } = message;
+        if (name && metadata && !metadata.isResponse) {
+            const { id } = metadata;
+            this.pendingMessages[id] = name;
+            let error: Error | undefined;
+            let results: any[] | undefined;
+            try {
+                const registered = handlers[name];
+                if (registered) {
+                    results = await Promise.all(registered.map(handler => handler(args)));
+                }
+            } catch (e) {
+                error = e;
+            }
+            if (!this.isDestroyed && this.target.send) {
+                const metadata = { id, isResponse: true };
+                const response: Response = { results , error };
+                const message = { name, args: response , metadata };
+                delete this.pendingMessages[id];
+                this.target.send(message);
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/agents/server_worker.ts b/src/server/DashSession/Session/agents/server_worker.ts
new file mode 100644
index 000000000..976d27226
--- /dev/null
+++ b/src/server/DashSession/Session/agents/server_worker.ts
@@ -0,0 +1,160 @@
+import { ExitHandler } from "./applied_session_agent";
+import { isMaster } from "cluster";
+import { manage } from "./promisified_ipc_manager";
+import IPCMessageReceiver from "./process_message_router";
+import { red, green, white, yellow } from "colors";
+import { get } from "request-promise";
+import { Monitor } from "./monitor";
+
+/**
+ * Effectively, each worker repairs the connection to the server by reintroducing a consistent state
+ * if its predecessor has died. It itself also polls the server heartbeat, and exits with a notification
+ * email if the server encounters an uncaught exception or if the server cannot be reached.
+ */
+export class ServerWorker extends IPCMessageReceiver {
+    private static count = 0;
+    private shouldServerBeResponsive = false;
+    private exitHandlers: ExitHandler[] = [];
+    private pollingFailureCount = 0;
+    private pollingIntervalSeconds: number;
+    private pollingFailureTolerance: number;
+    private pollTarget: string;
+    private serverPort: number;
+    private isInitialized = false;
+
+    public static Create(work: Function) {
+        if (isMaster) {
+            console.error(red("cannot create a worker on the monitor process."));
+            process.exit(1);
+        } else if (++ServerWorker.count > 1) {
+            ServerWorker.IPCManager.emit("kill", {
+                reason: "cannot create more than one worker on a given worker process.",
+                graceful: false,
+                errorCode: 1
+            });
+            process.exit(1);
+        } else {
+            return new ServerWorker(work);
+        }
+    }
+
+    /**
+     * Allows developers to invoke application specific logic
+     * by hooking into the exiting of the server process.
+     */
+    public addExitHandler = (handler: ExitHandler) => this.exitHandlers.push(handler);
+
+    /**
+     * Kill the session monitor (parent process) from this
+     * server worker (child process). This will also kill
+     * this process (child process).
+     */
+    public killSession = (reason: string, graceful = true, errorCode = 0) => this.emit<never>("kill", { reason, graceful, errorCode });
+
+    /**
+     * A convenience wrapper to tell the session monitor (parent process)
+     * to carry out the action with the specified message and arguments.
+     */
+    public emit = async <T = any>(name: string, args?: any) => ServerWorker.IPCManager.emit<T>(name, args);
+
+    private constructor(work: Function) {
+        super();
+        this.configureInternalHandlers();
+        ServerWorker.IPCManager = manage(process, this.handlers);
+        this.lifecycleNotification(green(`initializing process... ${white(`[${process.execPath} ${process.execArgv.join(" ")}]`)}`));
+
+        const { pollingRoute, serverPort, pollingIntervalSeconds, pollingFailureTolerance } = process.env;
+        this.serverPort = Number(serverPort);
+        this.pollingIntervalSeconds = Number(pollingIntervalSeconds);
+        this.pollingFailureTolerance = Number(pollingFailureTolerance);
+        this.pollTarget = `http://localhost:${serverPort}${pollingRoute}`;
+
+        work();
+        this.pollServer();
+    }
+
+    /**
+     * Set up message and uncaught exception handlers for this
+     * server process.
+     */
+    protected configureInternalHandlers = () => {
+        // updates the local values of variables to the those sent from master
+        this.on("updatePollingInterval", ({ newPollingIntervalSeconds }) => this.pollingIntervalSeconds = newPollingIntervalSeconds);
+        this.on("manualExit", async ({ isSessionEnd }) => {
+            await ServerWorker.IPCManager.destroy();
+            await this.executeExitHandlers(isSessionEnd);
+            process.exit(0);
+        });
+
+        // one reason to exit, as the process might be in an inconsistent state after such an exception
+        process.on('uncaughtException', this.proactiveUnplannedExit);
+        process.on('unhandledRejection', reason => {
+            const appropriateError = reason instanceof Error ? reason : new Error(`unhandled rejection: ${reason}`);
+            this.proactiveUnplannedExit(appropriateError);
+        });
+    }
+
+    /**
+     * Execute the list of functions registered to be called
+     * whenever the process exits.
+     */
+    private executeExitHandlers = async (reason: Error | boolean) => Promise.all(this.exitHandlers.map(handler => handler(reason)));
+
+    /**
+     * Notify master thread (which will log update in the console) of initialization via IPC.
+     */
+    public lifecycleNotification = (event: string) => this.emit("lifecycle", { event });
+
+    /**
+     * Called whenever the process has a reason to terminate, either through an uncaught exception
+     * in the process (potentially inconsistent state) or the server cannot be reached.
+     */
+    private proactiveUnplannedExit = async (error: Error): Promise<void> => {
+        this.shouldServerBeResponsive = false;
+        // communicates via IPC to the master thread that it should dispatch a crash notification email
+        this.emit(Monitor.IntrinsicEvents.CrashDetected, { error });
+        await this.executeExitHandlers(error);
+        // notify master thread (which will log update in the console) of crash event via IPC
+        this.lifecycleNotification(red(`crash event detected @ ${new Date().toUTCString()}`));
+        this.lifecycleNotification(red(error.message));
+        await ServerWorker.IPCManager.destroy();
+        process.exit(1);
+    }
+
+    /**
+     * This monitors the health of the server by submitting a get request to whatever port / route specified
+     * by the configuration every n seconds, where n is also given by the configuration. 
+     */
+    private pollServer = async (): Promise<void> => {
+        await new Promise<void>(resolve => {
+            setTimeout(async () => {
+                try {
+                    await get(this.pollTarget);
+                    if (!this.shouldServerBeResponsive) {
+                        // notify monitor thread that the server is up and running
+                        this.lifecycleNotification(green(`listening on ${this.serverPort}...`));
+                        this.emit(Monitor.IntrinsicEvents.ServerRunning, { isFirstTime: !this.isInitialized });
+                        this.isInitialized = true;
+                    }
+                    this.shouldServerBeResponsive = true;
+                } catch (error) {
+                    // if we expect the server to be unavailable, i.e. during compilation,
+                    // the listening variable is false, activeExit will return early and the child
+                    // process will continue
+                    if (this.shouldServerBeResponsive) {
+                        if (++this.pollingFailureCount > this.pollingFailureTolerance) {
+                            this.proactiveUnplannedExit(error);
+                        } else {
+                            this.lifecycleNotification(yellow(`the server has encountered ${this.pollingFailureCount} of ${this.pollingFailureTolerance} tolerable failures`));
+                        }
+                    }
+                } finally {
+                    resolve();
+                }
+            }, 1000 * this.pollingIntervalSeconds);
+        });
+        // controlled, asynchronous infinite recursion achieves a persistent poll that does not submit a new request until the previous has completed
+        this.pollServer();
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/utilities/repl.ts b/src/server/DashSession/Session/utilities/repl.ts
new file mode 100644
index 000000000..643141286
--- /dev/null
+++ b/src/server/DashSession/Session/utilities/repl.ts
@@ -0,0 +1,128 @@
+import { createInterface, Interface } from "readline";
+import { red, green, white } from "colors";
+
+export interface Configuration {
+    identifier: () => string | string;
+    onInvalid?: (command: string, validCommand: boolean) => string | string;
+    onValid?: (success?: string) => string | string;
+    isCaseSensitive?: boolean;
+}
+
+export type ReplAction = (parsedArgs: Array<string>) => any | Promise<any>;
+export interface Registration {
+    argPatterns: RegExp[];
+    action: ReplAction;
+}
+
+export default class Repl {
+    private identifier: () => string | string;
+    private onInvalid: ((command: string, validCommand: boolean) => string) | string;
+    private onValid: ((success: string) => string) | string;
+    private isCaseSensitive: boolean;
+    private commandMap = new Map<string, Registration[]>();
+    public interface: Interface;
+    private busy = false;
+    private keys: string | undefined;
+
+    constructor({ identifier: prompt, onInvalid, onValid, isCaseSensitive }: Configuration) {
+        this.identifier = prompt;
+        this.onInvalid = onInvalid || this.usage;
+        this.onValid = onValid || this.success;
+        this.isCaseSensitive = isCaseSensitive ?? true;
+        this.interface = createInterface(process.stdin, process.stdout).on('line', this.considerInput);
+    }
+
+    private resolvedIdentifier = () => typeof this.identifier === "string" ? this.identifier : this.identifier();
+
+    private usage = (command: string, validCommand: boolean) => {
+        if (validCommand) {
+            const formatted = white(command);
+            const patterns = green(this.commandMap.get(command)!.map(({ argPatterns }) => `${formatted}  ${argPatterns.join("  ")}`).join('\n'));
+            return `${this.resolvedIdentifier()}\nthe given arguments do not match any registered patterns for ${formatted}\nthe list of valid argument patterns is given by:\n${patterns}`;
+        } else {
+            const resolved = this.keys;
+            if (resolved) {
+                return resolved;
+            }
+            const members: string[] = [];
+            const keys = this.commandMap.keys();
+            let next: IteratorResult<string>;
+            while (!(next = keys.next()).done) {
+                members.push(next.value);
+            }
+            return `${this.resolvedIdentifier()} commands: { ${members.sort().join(", ")} }`;
+        }
+    }
+
+    private success = (command: string) => `${this.resolvedIdentifier()} completed local execution of ${white(command)}`;
+
+    public registerCommand = (basename: string, argPatterns: (RegExp | string)[], action: ReplAction) => {
+        const existing = this.commandMap.get(basename);
+        const converted = argPatterns.map(input => input instanceof RegExp ? input : new RegExp(input));
+        const registration = { argPatterns: converted, action };
+        if (existing) {
+            existing.push(registration);
+        } else {
+            this.commandMap.set(basename, [registration]);
+        }
+    }
+
+    private invalid = (command: string, validCommand: boolean) => {
+        console.log(red(typeof this.onInvalid === "string" ? this.onInvalid : this.onInvalid(command, validCommand)));
+        this.busy = false;
+    }
+
+    private valid = (command: string) => {
+        console.log(green(typeof this.onValid === "string" ? this.onValid : this.onValid(command)));
+        this.busy = false;
+    }
+
+    private considerInput = async (line: string) => {
+        if (this.busy) {
+            console.log(red("Busy"));
+            return;
+        }
+        this.busy = true;
+        line = line.trim();
+        if (this.isCaseSensitive) {
+            line = line.toLowerCase();
+        }
+        const [command, ...args] = line.split(/\s+/g);
+        if (!command) {
+            return this.invalid(command, false);
+        }
+        const registered = this.commandMap.get(command);
+        if (registered) {
+            const { length } = args;
+            const candidates = registered.filter(({ argPatterns: { length: count } }) => count === length);
+            for (const { argPatterns, action } of candidates) {
+                const parsed: string[] = [];
+                let matched = true;
+                if (length) {
+                    for (let i = 0; i < length; i++) {
+                        let matches: RegExpExecArray | null;
+                        if ((matches = argPatterns[i].exec(args[i])) === null) {
+                            matched = false;
+                            break;
+                        }
+                        parsed.push(matches[0]);
+                    }
+                }
+                if (!length || matched) {
+                    const result = action(parsed);
+                    const resolve = () => this.valid(`${command} ${parsed.join(" ")}`);
+                    if (result instanceof Promise) {
+                        result.then(resolve);
+                    } else {
+                        resolve();
+                    }
+                    return;
+                }
+            }
+            this.invalid(command, true);
+        } else {
+            this.invalid(command, false);
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/DashSession/Session/utilities/session_config.ts b/src/server/DashSession/Session/utilities/session_config.ts
new file mode 100644
index 000000000..b0e65dde4
--- /dev/null
+++ b/src/server/DashSession/Session/utilities/session_config.ts
@@ -0,0 +1,129 @@
+import { Schema } from "jsonschema";
+import { yellow, red, cyan, green, blue, magenta, Color, grey, gray, white, black } from "colors";
+
+const colorPattern = /black|red|green|yellow|blue|magenta|cyan|white|gray|grey/;
+
+const identifierProperties: Schema = {
+    type: "object",
+    properties: {
+        text: {
+            type: "string",
+            minLength: 1
+        },
+        color: {
+            type: "string",
+            pattern: colorPattern
+        }
+    }
+};
+
+const portProperties: Schema = {
+    type: "number",
+    minimum: 1024,
+    maximum: 65535
+};
+
+export const configurationSchema: Schema = {
+    id: "/configuration",
+    type: "object",
+    properties: {
+        showServerOutput: { type: "boolean" },
+        ports: {
+            type: "object",
+            properties: {
+                server: portProperties,
+                socket: portProperties
+            },
+            required: ["server"],
+            additionalProperties: true
+        },
+        identifiers: {
+            type: "object",
+            properties: {
+                master: identifierProperties,
+                worker: identifierProperties,
+                exec: identifierProperties
+            }
+        },
+        polling: {
+            type: "object",
+            additionalProperties: false,
+            properties: {
+                intervalSeconds: {
+                    type: "number",
+                    minimum: 1,
+                    maximum: 86400
+                },
+                route: {
+                    type: "string",
+                    pattern: /\/[a-zA-Z]*/g
+                },
+                failureTolerance: {
+                    type: "number",
+                    minimum: 0,
+                }
+            }
+        },
+    }
+};
+
+type ColorLabel = "yellow" | "red" | "cyan" | "green" | "blue" | "magenta" | "grey" | "gray" | "white" | "black";
+
+export const colorMapping: Map<ColorLabel, Color> = new Map([
+    ["yellow", yellow],
+    ["red", red],
+    ["cyan", cyan],
+    ["green", green],
+    ["blue", blue],
+    ["magenta", magenta],
+    ["grey", grey],
+    ["gray", gray],
+    ["white", white],
+    ["black", black]
+]);
+
+interface Identifier {
+    text: string;
+    color: ColorLabel;
+}
+
+export interface Identifiers {
+    master: Identifier;
+    worker: Identifier;
+    exec: Identifier;
+}
+
+export interface Configuration {
+    showServerOutput: boolean;
+    identifiers: Identifiers;
+    ports: { [description: string]: number };
+    polling: {
+        route: string;
+        intervalSeconds: number;
+        failureTolerance: number;
+    };
+}
+
+export const defaultConfig: Configuration = {
+    showServerOutput: false,
+    identifiers: {
+        master: {
+            text: "__monitor__",
+            color: "yellow"
+        },
+        worker: {
+            text: "__server__",
+            color: "magenta"
+        },
+        exec: {
+            text: "__exec__",
+            color: "green"
+        }
+    },
+    ports: { server: 3000 },
+    polling: {
+        route: "/",
+        intervalSeconds: 30,
+        failureTolerance: 0
+    }
+};
\ No newline at end of file
diff --git a/src/server/DashSession/Session/utilities/utilities.ts b/src/server/DashSession/Session/utilities/utilities.ts
new file mode 100644
index 000000000..eb8de9d7e
--- /dev/null
+++ b/src/server/DashSession/Session/utilities/utilities.ts
@@ -0,0 +1,37 @@
+import { v4 } from "uuid";
+
+export namespace Utilities {
+
+    export function guid() {
+        return v4();
+    }
+
+    /**
+         * At any arbitrary layer of nesting within the configuration objects, any single value that
+         * is not specified by the configuration is given the default counterpart. If, within an object,
+         * one peer is given by configuration and two are not, the one is preserved while the two are given
+         * the default value.
+         * @returns the composition of all of the assigned objects, much like Object.assign(), but with more
+         * granularity in the overwriting of nested objects
+         */
+    export function preciseAssign(target: any, ...sources: any[]): any {
+        for (const source of sources) {
+            preciseAssignHelper(target, source);
+        }
+        return target;
+    }
+
+    export function preciseAssignHelper(target: any, source: any) {
+        Array.from(new Set([...Object.keys(target), ...Object.keys(source)])).map(property => {
+            let targetValue: any, sourceValue: any;
+            if (sourceValue = source[property]) {
+                if (typeof sourceValue === "object" && typeof (targetValue = target[property]) === "object") {
+                    preciseAssignHelper(targetValue, sourceValue);
+                } else {
+                    target[property] = sourceValue;
+                }
+            }
+        });
+    }
+
+}
\ No newline at end of file
diff --git a/src/server/index.ts b/src/server/index.ts
index 2101de1d2..88f5fa3bf 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -24,7 +24,7 @@ import { Logger } from "./ProcessFactory";
 import { yellow } from "colors";
 import { DashSessionAgent } from "./DashSession/DashSessionAgent";
 import SessionManager from "./ApiManagers/SessionManager";
-import { AppliedSessionAgent } from "resilient-server-session";
+import { AppliedSessionAgent } from "./DashSession/Session/agents/applied_session_agent";
 
 export const onWindows = process.platform === "win32";
 export let sessionAgent: AppliedSessionAgent;