Merge branch 'master' of https://github.com/browngraphicslab/Dash-Web into pen

1 files changed, 62 insertions, 0 deletions

diff --git a/src/server/DashSession.ts b/src/server/DashSession.ts
new file mode 100644
index 000000000..83ce7caaf
--- /dev/null
+++ b/src/server/DashSession.ts
@@ -0,0 +1,62 @@
+import { Session } from "./Session/session";
+import { Email } from "./ActionUtilities";
+import { red, yellow } from "colors";
+import { SolrManager } from "./ApiManagers/SearchManager";
+import { execSync } from "child_process";
+import { Utils } from "../Utils";
+import { WebSocket } from "./Websocket/Websocket";
+import { MessageStore } from "./Message";
+import { launchServer } from ".";
+
+/**
+* If we're the monitor (master) thread, we should launch the monitor logic for the session.
+* Otherwise, we must be on a worker thread that was spawned *by* the monitor (master) thread, and thus
+* our job should be to run the server.
+*/
+export class DashSessionAgent extends Session.AppliedSessionAgent {
+
+    private readonly notificationRecipients = ["samuel_wilkins@brown.edu"];
+    private readonly signature = "-Dash Server Session Manager";
+
+    protected async launchMonitor() {
+        const monitor = Session.Monitor.Create({
+            key: async key => {
+                // this sends a pseudorandomly generated guid to the configuration's recipients, allowing them alone
+                // to kill the server via the /kill/:key route
+                const content = `The key for this session (started @ ${new Date().toUTCString()}) is ${key}.\n\n${this.signature}`;
+                const failures = await Email.dispatchAll(this.notificationRecipients, "Server Termination Key", content);
+                if (failures) {
+                    failures.map(({ recipient, error: { message } }) => monitor.log(red(`dispatch failure @ ${recipient} (${yellow(message)})`)));
+                    return false;
+                }
+                return true;
+            },
+            crash: async ({ name, message, stack }) => {
+                const body = [
+                    "You, as a Dash Administrator, are being notified of a server crash event. Here's what we know:",
+                    `name:\n${name}`,
+                    `message:\n${message}`,
+                    `stack:\n${stack}`,
+                    "The server is already restarting itself, but if you're concerned, use the Remote Desktop Connection to monitor progress.",
+                ].join("\n\n");
+                const content = `${body}\n\n${this.signature}`;
+                const failures = await Email.dispatchAll(this.notificationRecipients, "Dash Web Server Crash", content);
+                if (failures) {
+                    failures.map(({ recipient, error: { message } }) => monitor.log(red(`dispatch failure @ ${recipient} (${yellow(message)})`)));
+                    return false;
+                }
+                return true;
+            }
+        });
+        monitor.addReplCommand("pull", [], () => execSync("git pull", { stdio: ["ignore", "inherit", "inherit"] }));
+        monitor.addReplCommand("solr", [/start|stop/], args => SolrManager.SetRunning(args[0] === "start"));
+        return monitor;
+    }
+
+    protected async launchServerWorker() {
+        const worker = Session.ServerWorker.Create(launchServer); // server initialization delegated to worker
+        worker.addExitHandler(() => Utils.Emit(WebSocket._socket, MessageStore.ConnectionTerminated, "Manual"));
+        return worker;
+    }
+
+}
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