From 9ef3a3aca0b16815bd70bed9c94ec19881003757 Mon Sep 17 00:00:00 2001
From: Cory McWilliams <cory@unprompted.com>
Date: Sat, 29 Apr 2023 19:27:00 +0000
Subject: [PATCH] An experiment: Always show some stats as little sparklines at
 the top of the screen.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4268 ed5197a5-7fde-0310-b194-c3ffbd925b24
---
 core/client.js | 117 +++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 95 insertions(+), 22 deletions(-)

diff --git a/core/client.js b/core/client.js
index 1d7b31e0..e23a7527 100644
--- a/core/client.js
+++ b/core/client.js
@@ -1,7 +1,6 @@
-import {LitElement, html, css} from '/static/lit/lit-all.min.js';
+import {LitElement, html, css, svg} from '/static/lit/lit-all.min.js';
 
 let gSocket;
-let gPermissions;
 
 let gCurrentFile;
 let gFiles = {};
@@ -52,6 +51,7 @@ class TfNavigationElement extends LitElement {
 			permissions: {type: Object},
 			show_permissions: {type: Boolean},
 			status: {type: Object},
+			spark_lines: {type: Object},
 		};
 	}
 
@@ -60,6 +60,7 @@ class TfNavigationElement extends LitElement {
 		this.permissions = {};
 		this.show_permissions = false;
 		this.status = {};
+		this.spark_lines = {};
 	}
 
 	toggle_edit(event) {
@@ -75,6 +76,21 @@ class TfNavigationElement extends LitElement {
 		send({action: "resetPermission", permission: key});
 	}
 
+	get_spark_line(key, options) {
+		if (!this.spark_lines[key]) {
+			let spark_line = document.createElement('tf-sparkline');
+			spark_line.title = key;
+			if (options) {
+				if (options.max) {
+					spark_line.max = options.max;
+				}
+			}
+			this.spark_lines[key] = spark_line;
+			this.requestUpdate();
+		}
+		return this.spark_lines[key];
+	}
+
 	render_login() {
 		if (this?.credentials?.session?.name) {
 			return html`<a href="/login/logout?return=${url() + hash()}">logout ${this.credentials.session.name}</a>`;
@@ -106,22 +122,21 @@ class TfNavigationElement extends LitElement {
 		let self = this;
 		return html`
 			<style>
-				* {
-					height: auto;
-					margin: 4px;
-				}
 				${k_global_style}
 			</style>
-			<span>😎</span>
-			<a accesskey="h" data-tip="Open home app." href="/" style="color: #fff">Tilde Friends</a>
-			<a accesskey="a" data-tip="Open apps list." href="/~core/apps/">apps</a>
-			<a accesskey="e" data-tip="Toggle the app editor." href="#" @click=${this.toggle_edit}>edit</a>
-			<a accesskey="p" data-tip="View and change permissions." href="#" @click=${() => self.show_permissions = !self.show_permissions}>🎛️</a>
-			<span style="display: inline-block; vertical-align: top; white-space: pre; color: ${this.status.color ?? kErrorColor}">${this.status.message}</span>
-			<span id="requests"></span>
-			${this.render_permissions()}
-			<span id="permissions"></span>
-			<span style="float: right">${this.render_login()}</span>
+			<div style="margin: 4px">
+				<span>😎</span>
+				<a accesskey="h" data-tip="Open home app." href="/" style="color: #fff">Tilde Friends</a>
+				<a accesskey="a" data-tip="Open apps list." href="/~core/apps/">apps</a>
+				<a accesskey="e" data-tip="Toggle the app editor." href="#" @click=${this.toggle_edit}>edit</a>
+				<a accesskey="p" data-tip="View and change permissions." href="#" @click=${() => self.show_permissions = !self.show_permissions}>🎛️</a>
+				<span style="display: inline-block; vertical-align: top; white-space: pre; color: ${this.status.color ?? kErrorColor}">${this.status.message}</span>
+				<span id="requests"></span>
+				${this.render_permissions()}
+				<span>${Object.values(this.spark_lines)}</span>
+				<span id="permissions"></span>
+				<span style="float: right">${this.render_login()}</span>
+			</div>
 		`;
 	}
 }
@@ -193,6 +208,65 @@ class TfFilesElement extends LitElement {
 }
 customElements.define('tf-files', TfFilesElement);
 
+class TfSparkLineElement extends LitElement {
+	static get properties() {
+		return {
+			lines: {type: Array},
+			min: {type: Number},
+			max: {type: Number},
+		};
+	}
+
+	constructor() {
+		super();
+		this.min = 0;
+		this.max = 1.0;
+		this.lines = [];
+	}
+
+	append(key, value) {
+		let line = null;
+		for (let it of this.lines) {
+			if (it.name == key) {
+				line = it;
+				break;
+			}
+		}
+		if (!line) {
+			const k_colors = ['#0f0', '#88f', '#ff0', '#f0f', '#0ff', '#f00', '#888'];
+			line = {
+				name: key,
+				style: k_colors[this.lines.length % k_colors.length],
+				values: [],
+			};
+			this.lines.push(line);
+		}
+		line.values.push(value);
+		if (line.values.length > 100) {
+			line.values.shift();
+		}
+		this.requestUpdate();
+	}
+
+	render_line(line) {
+		if (line?.values?.length >= 2) {
+			let points = [].concat(...line.values.map((x, i) => [i * 100 / (line.values.length - 1), 10 - 10 * (x - this.min) / (this.max - this.min)]));
+			return svg`
+				<polyline points=${points.join(' ')} stroke=${line.style} fill="none"/>
+			`;
+		}
+	}
+
+	render() {
+		return html`
+			<svg style="width: 10em; height: 1em; vertical-align: bottom; margin: 0; padding: 0" viewPort="0 0 100 10" xmlns="http://www.w3.org/2000/svg">
+				${this.lines.map(x => this.render_line(x))}
+			</svg>
+		`;
+	}
+}
+customElements.define('tf-sparkline', TfSparkLineElement);
+
 window.addEventListener("keydown", function(event) {
 	if (event.keyCode == 83 && (event.altKey || event.ctrlKey)) {
 		if (editing()) {
@@ -306,13 +380,11 @@ function trace() {
 function stats() {
 	window.localStorage.setItem('stats', '1');
 	document.getElementById("statsPane").style.display = 'flex';
-	send({action: 'enableStats', enabled: true});
 }
 
 function closeStats() {
 	window.localStorage.setItem('stats', '0');
 	document.getElementById("statsPane").style.display = 'none';
-	send({action: 'enableStats', enabled: false});
 }
 
 function toggleStats() {
@@ -648,10 +720,7 @@ function _receive_websocket_message(message) {
 		if (window.location.hash) {
 			send({event: "hashChange", hash: window.location.hash});
 		}
-		if (window.localStorage.getItem('stats') == '1') {
-			/* Stats were opened before we connected. */
-			send({action: 'enableStats', enabled: true});
-		}
+		send({action: 'enableStats', enabled: true});
 	} else if (message && message.action == "ping") {
 		send({action: "pong"});
 	} else if (message && message.action == "stats") {
@@ -733,6 +802,10 @@ function _receive_websocket_message(message) {
 				}
 			}
 			timeseries.append(now, message.stats[key]);
+
+			if (graph_key == 'cpu' || graph_key == 'rpc' || graph_key == 'stored') {
+				document.getElementsByTagName('tf-navigation')[0].get_spark_line(graph_key, { max: 100 }).append(key, message.stats[key]);
+			}
 		}
 	} else if (message &&
 		message.message === 'tfrpc' &&