compute orchestration (#763)

- Added local process runners for Linux/Wine, Mac with some sandboxing support
- Horde & Nomad provisioning for development and testing
- Client session queues with lifecycle management (active/draining/cancelled), automatic retry with configurable limits, and manual reschedule API
- Improved web UI for orchestrator, compute, and hub dashboards with WebSocket push updates
- Some security hardening
- Improved scalability and `zen exec` command

Still experimental - compute support is disabled by default

1 files changed, 36 insertions, 0 deletions

diff --git a/src/zenserver/frontend/html/pages/page.js b/src/zenserver/frontend/html/pages/page.js
index 3c2d3619a..592b699dc 100644
--- a/src/zenserver/frontend/html/pages/page.js
+++ b/src/zenserver/frontend/html/pages/page.js
@@ -3,6 +3,7 @@
 "use strict";
 
 import { WidgetHost } from "../util/widgets.js"
+import { Fetcher } from "../util/fetcher.js"
 
 ////////////////////////////////////////////////////////////////////////////////
 export class PageBase extends WidgetHost
@@ -63,6 +64,7 @@ export class ZenPage extends PageBase
 		super(parent, ...args);
 		super.set_title("zen");
 		this.add_branding(parent);
+		this.add_service_nav(parent);
 		this.generate_crumbs();
 	}
 
@@ -78,6 +80,40 @@ export class ZenPage extends PageBase
 		root.tag("img").attr("src", "epicgames.ico").id("epic_logo");
 	}
 
+	add_service_nav(parent)
+	{
+		const nav = parent.tag().id("service_nav");
+
+		// Map service base URIs to dashboard links, this table is also used to detemine
+		// which links to show based on the services that are currently registered.
+
+		const service_dashboards = [
+			{ base_uri: "/compute/",  label: "Compute", 		href: "/dashboard/compute/compute.html" },
+			{ base_uri: "/orch/",   label: "Orchestrator", 	href: "/dashboard/compute/orchestrator.html" },
+			{ base_uri: "/hub/",    label: "Hub", 			href: "/dashboard/compute/hub.html" },
+		];
+
+		new Fetcher().resource("/api/").json().then((data) => {
+			const services = data.services || [];
+			const uris = new Set(services.map(s => s.base_uri));
+
+			const links = service_dashboards.filter(d => uris.has(d.base_uri));
+
+			if (links.length === 0)
+			{
+				nav.inner().style.display = "none";
+				return;
+			}
+
+			for (const link of links)
+			{
+				nav.tag("a").text(link.label).attr("href", link.href);
+			}
+		}).catch(() => {
+			nav.inner().style.display = "none";
+		});
+	}
+
 	set_title(...args)
 	{
 		super.set_title(...args);