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|
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>continuum</title>
<style>
:root {
--bg: #fafaf9; --fg: #1c1917; --muted: #78716c; --line: #e7e5e4; --panel: #ffffff;
--ok: #15803d; --warn: #c2410c; --bad: #b91c1c; --intended: #a8a29e; --self: #1d4ed8;
}
@media (prefers-color-scheme: dark) {
:root {
--bg: #1c1917; --fg: #f5f5f4; --muted: #a8a29e; --line: #44403c; --panel: #292524;
--ok: #4ade80; --warn: #fb923c; --bad: #f87171; --intended: #57534e; --self: #60a5fa;
}
}
* { box-sizing: border-box; }
html { background: var(--bg); }
/* The window's height, unless it is way too small: then the page scrolls. */
body { margin: 0; background: var(--bg); color: var(--fg);
font: 14px/1.4 system-ui, sans-serif;
height: 100vh; min-height: 480px; display: flex; flex-direction: column; }
header { display: flex; gap: 1em; align-items: baseline; padding: 12px 16px;
border-bottom: 1px solid var(--line); flex-wrap: wrap; }
header h1 { font-size: 16px; margin: 0; }
#connection { margin-left: auto; color: var(--muted); }
#clock-warning, #peers .clock-off { color: var(--warn); }
#connection.live { color: var(--ok); }
#connection.down { color: var(--bad); }
/* A dot in the status's colour that breathes once with every event. */
#dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%;
background: currentColor; margin-right: 6px; vertical-align: 1px; opacity: .45; }
#dot.pulse { animation: breath .9s ease-in-out; }
@keyframes breath {
0% { opacity: .45; transform: scale(1); }
30% { opacity: 1; transform: scale(1.35); box-shadow: 0 0 6px currentColor; }
100% { opacity: .45; transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) { #dot.pulse { animation-duration: .01s; } }
body.stale main { opacity: .55; }
/* Swarm on the left, the full height; peers (as tall as their rows, up to 8) above
the figures (the rest) on the right. */
main { flex: 1; min-height: 0; display: grid; gap: 16px; padding: 16px;
grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
grid-template-rows: auto minmax(0, 1fr) minmax(0, 1fr);
grid-template-areas: "map peers" "map figures" "map document"; }
@media (max-width: 900px) {
body { height: auto; }
main { grid-template-columns: minmax(0, 1fr); grid-template-rows: 70vh auto 70vh 70vh;
grid-template-areas: "map" "peers" "figures" "document"; }
}
section { background: var(--panel); border: 1px solid var(--line); border-radius: 6px;
padding: 12px; min-width: 0; min-height: 0; display: flex; flex-direction: column; }
section h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em;
color: var(--muted); margin: 0 0 8px; flex: none; }
section h2 .what { text-transform: none; letter-spacing: 0; color: var(--fg); }
section h2 .what .id { color: var(--muted); font-weight: normal; word-break: break-all; }
#map { grid-area: map; }
#peers-box { grid-area: peers; }
#figures-box { grid-area: figures; }
#document-box { grid-area: document; }
svg { flex: 1; min-height: 0; width: 100%; display: block; cursor: default; }
/* Dragged to pan or to move a node, also by touch. */
#graph { touch-action: none; }
#graph.dragging, #graph.dragging * { cursor: grabbing; }
svg circle { cursor: pointer; }
.legend { color: var(--muted); font-size: 12px; display: flex; gap: 1em; flex-wrap: wrap;
flex: none; }
.legend span::before { content: ""; display: inline-block; width: 18px; height: 0;
vertical-align: middle; margin-right: 4px; border-top: 2px solid var(--colour, currentColor); }
.legend .intended::before { border-top-style: dashed; --colour: var(--intended); }
.legend .used::before { border-top-width: 3px; --colour: var(--muted); }
.legend .other::before { border-top-width: 1px; --colour: var(--muted); }
.legend .direct::before { --colour: var(--muted); }
.legend .relayed::before { border-top-style: dashed; --colour: var(--muted); }
.legend .dormant::before { border-top-width: 1.5px; --colour: var(--muted);
box-shadow: 0 0 0 2.5px color-mix(in srgb, var(--bad) 50%, transparent); }
.legend .silent::before { border-top-style: dotted; --colour: var(--muted); }
.legend .hint::before { display: none; }
#legends { flex: none; }
/* Hides the legend, and shows it again. */
button.toggle { font: inherit; font-size: 12px; text-transform: none; letter-spacing: 0;
float: right; padding: 0 6px; color: var(--muted); background: none;
border: 1px solid var(--line); border-radius: 3px; cursor: pointer; }
button.toggle:hover { color: var(--fg); border-color: var(--muted); }
/* Nodes: circles, as on the map. */
.legend .node::before { width: 10px; height: 10px; border: 1.5px solid var(--fg);
border-radius: 50%; background: var(--fg); }
.legend .node.silent::before { background: var(--panel); }
.legend .node.self::before { border-color: var(--self); background: var(--self); }
.legend .node.dormant-node::before { border: 2.5px solid var(--bad); }
.legend .node.focus::before { width: 14px; height: 14px; background: var(--self);
border: none; opacity: .35; }
.scroll { overflow: auto; min-height: 0; }
#figures-box .scroll, #document-box .scroll { flex: 1; }
.tree pre { margin: 2px 0 4px 1.1em; white-space: pre-wrap; word-break: break-all;
max-height: 20em; overflow: auto; }
.note { color: var(--muted); font-style: italic; }
.error { color: var(--bad); }
.tree button.add { font: inherit; line-height: 1; padding: 0 4px; margin-left: 4px;
color: var(--muted); background: none; border: 1px solid var(--line); border-radius: 3px;
cursor: pointer; }
.tree button.add:hover { color: var(--fg); border-color: var(--muted); }
.tree .nested { padding-left: 1.1em; }
.editor input.extra[type=text] { width: 12em; margin-bottom: 2px; display: block; }
.editor { margin: 2px 0 4px; }
.tree details > .editor { margin-left: 1.1em; }
.editor input[type=text], .editor textarea { width: 100%; font: inherit; color: var(--fg);
background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 2px 4px; }
.editor button { font: inherit; }
.tree details.editing > :not(summary):not(.editor) { display: none; }
.tree .leaf[title] { cursor: text; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 3px 8px 3px 0; border-bottom: 1px solid var(--line);
white-space: nowrap; }
th { color: var(--muted); font-weight: 500; position: sticky; top: 0;
background: var(--panel); }
#peers tr[data-peer] { cursor: pointer; }
#peers tr.focused td { background: var(--line); }
.id { font-family: ui-monospace, monospace; font-size: 12px; }
/* A peer's status (not the legend's "dormant"). */
#peers .active { color: var(--ok); } #peers .dormant { color: var(--bad); }
#peers .unknown { color: var(--muted); }
.tree { font-family: ui-monospace, monospace; font-size: 12px; }
/* Every entry indented alike: a branch's triangle sits in the indentation, left of
where the text of every entry begins. */
.tree details, .tree .leaf { position: relative; padding-left: 1.1em; }
.tree summary { cursor: pointer; list-style: none; }
.tree summary::-webkit-details-marker { display: none; }
.tree summary::before { content: "▸"; position: absolute; left: .1em; color: var(--muted); }
.tree details[open] > summary::before { content: "▾"; }
.tree details > .note { padding-left: 1.1em; }
.key { color: var(--muted); }
</style>
</head>
<body>
<header>
<h1>continuum</h1>
<span id="node" class="id"></span>
<span id="clock-warning"></span>
<span id="connection"><span id="dot"></span><span id="connection-text">connecting…</span></span>
</header>
<main>
<section id="map">
<h2>Swarm <button id="legend-toggle" class="toggle">hide legend</button></h2>
<div id="legends">
<div class="legend">
<span class="node self">this node</span>
<span class="node">reports its links</span>
<span class="node silent">reports none (no LINKS_REPLY)</span>
<span class="node dormant-node">dormant (to this node)</span>
<span class="node focus">in focus (click a node)</span>
</div>
<div class="legend" id="legend"></div>
<div class="legend">
<span class="hint">drag to pan, wheel or pinch to zoom, turn with two fingers,
double-click to reset; drag a node to pin it, double-click it to let go</span>
</div>
</div>
<svg id="graph"><g id="view"></g></svg>
</section>
<section id="peers-box">
<h2>Peers</h2>
<div class="scroll" id="peers-scroll"><table id="peers"></table></div>
</section>
<section id="figures-box">
<h2 id="figures-title">Figures</h2>
<div class="scroll"><div id="stats" class="tree"></div></div>
</section>
<section id="document-box">
<h2>Document</h2>
<div class="scroll"><div id="document" class="tree"></div></div>
</section>
</main>
<script>
"use strict";
// Which page this is (the node fills it in); a snapshot naming another came from
// another build: reloaded then, to get its page.
const PAGE_VERSION = "__PAGE_VERSION__";
// The state as the node published it, and when it did (the last event).
let state = null;
let stateAt = 0;
// Fields that grow by themselves: the node's list (`GROWING` and `is_age` in its
// dashboard), filled in when it serves the page.
const GROWING = new Set(__GROWING__);
const isAge = key => key === "secsAgo" || key.endsWith("SecsAgo") || GROWING.has(key);
const elapsed = () => Math.floor((Date.now() - stateAt) / 1000);
const aged = (key, value) =>
isAge(key) && typeof value === "number" ? value + elapsed() : value;
// RFC 7386.
function mergePatch(target, patch) {
if (patch === null || typeof patch !== "object" || Array.isArray(patch)) return patch;
const result = target !== null && typeof target === "object" && !Array.isArray(target)
? target : {};
for (const [key, value] of Object.entries(patch)) {
if (value === null) delete result[key];
else result[key] = mergePatch(result[key], value);
}
return result;
}
function el(tag, attrs, ...children) {
const node = document.createElement(tag);
for (const [key, value] of Object.entries(attrs || {})) node.setAttribute(key, value);
for (const child of children) {
node.append(child instanceof Node ? child : document.createTextNode(String(child)));
}
return node;
}
const SVG = "http://www.w3.org/2000/svg";
function svg(tag, attrs) {
const node = document.createElementNS(SVG, tag);
for (const [key, value] of Object.entries(attrs || {})) node.setAttribute(key, value);
return node;
}
const short = id => id.length > 14 ? id.slice(0, 6) + "…" + id.slice(-6) : id;
function name(id) {
const member = state.graph.members[id];
return (member && member.alias) || (state.peers.peers[id] || {}).alias || short(id);
}
// Milliseconds as signed seconds: "+5.0 s".
const seconds = ms => (ms < 0 ? "−" : "+") + (Math.abs(ms) / 1000).toFixed(1) + " s";
// Whether `clock` (a peer's, `/peers`) differs from this node's beyond the limit for sure.
function clockOff(clock) {
const limit = (state.stats.clock || {}).limitMs || 0;
return !!clock && limit > 0 && Math.abs(clock.offsetMs) > clock.withinMs + limit;
}
function age(secs) {
if (secs === null || secs === undefined) return "";
if (secs < 120) return secs + " s";
if (secs < 7200) return Math.floor(secs / 60) + " min";
if (secs < 172800) return Math.floor(secs / 3600) + " h";
return Math.floor(secs / 86400) + " d";
}
// What is in focus, its figures shown: a node's ID, or a link's pair key (`pairKey`,
// two IDs). null: this node's (`/admin/stats`).
let focused = (() => {
try { return decodeURIComponent(location.hash.slice(1)) || null; } catch { return null; }
})();
const pairKey = (a, b) => a < b ? a + " " + b : b + " " + a;
const isPair = key => key !== null && key.includes(" ");
function focus(id) {
focused = id === null || id === state.node.id ? null : id;
// In the URL too, so a reload (a new version) keeps it.
try {
history.replaceState(null, "", focused === null ? location.pathname
: "#" + encodeURIComponent(focused));
} catch { /* not where history works */ }
render();
}
// --- Peers ---
function renderPeers() {
const table = document.getElementById("peers");
const rows = [el("tr", {}, ...["peer", "status", "seen", "via", "rtt", "clock", "neighbour",
"same epoch"]
.map(h => el("th", {}, h)))];
for (const [id, peer] of Object.entries(state.peers.peers)) {
const destination = peer.destination;
const path = destination && destination.paths && destination.paths[0];
const rtt = path && typeof path.rttMs === "number" ? path.rttMs.toFixed(1) + " ms" : "";
const via = destination
? destination.address + (destination.connection ? " (" + destination.connection + ")" : "")
: "";
const row = el("tr", { "data-peer": id, class: id === focused ? "focused" : "" },
el("td", { title: id }, peer.alias || el("span", { class: "id" }, short(id))),
// How long dormant is about how long unseen ("seen"): in the tooltip only.
el("td", { class: peer.status, title: peer.status === "dormant"
? "dormant for " + age(aged("dormantForSecs", peer.dormantForSecs)) : "" }, peer.status),
el("td", {}, age(aged("lastSeenSecsAgo", peer.lastSeenSecsAgo))),
el("td", { class: "id" }, via),
el("td", {}, rtt),
// Its clock against this node's, flagged beyond the limit (`--clock-skew-warn`).
el("td", { class: clockOff(peer.clock) ? "clock-off" : "", title: peer.clock
? "ahead of this node's by " + peer.clock.offsetMs + " ms, give or take " +
peer.clock.withinMs + " ms" : "" }, peer.clock ? seconds(peer.clock.offsetMs) : ""),
el("td", {}, peer.neighbour ? "yes" : ""),
el("td", {}, peer.sameEpoch === null || peer.sameEpoch === undefined
? "" : peer.sameEpoch ? "yes" : "no"));
// On press: the table may be drawn anew (ages) before a click would complete.
row.addEventListener("pointerdown", () => focus(id === focused ? null : id));
rows.push(row);
}
table.replaceChildren(...rows);
// As tall as the rows, up to 8 of them (and the header); then it scrolls.
const scroll = document.getElementById("peers-scroll");
scroll.style.maxHeight = rows.length > 9
? (rows[8].offsetTop + rows[8].offsetHeight) + "px" : "";
}
// --- Figures: a tree, its open branches kept across renders ---
const open = new Set(["stats", "peer", "links", "from", "to"]);
function tree(key, value, path) {
// Empty: nothing to open.
if (value !== null && typeof value === "object" && Object.keys(value).length === 0) {
return el("div", { class: "leaf" }, el("span", { class: "key" }, key + ": "),
Array.isArray(value) ? "[]" : "{}");
}
if (value !== null && typeof value === "object") {
const details = el("details", {});
if (open.has(path)) details.open = true;
details.addEventListener("toggle", () => {
if (details.open) open.add(path); else open.delete(path);
});
const entries = Array.isArray(value) ? value.map((v, i) => [String(i), v]) : Object.entries(value);
details.append(el("summary", {}, el("span", { class: "key" }, key),
Array.isArray(value) ? " [" + value.length + "]" : ""));
for (const [k, v] of entries) details.append(tree(k, v, path + "." + k));
return details;
}
return el("div", { class: "leaf" }, el("span", { class: "key" }, key + ": "),
JSON.stringify(aged(key, value)));
}
function renderStats() {
const title = document.getElementById("figures-title");
const what = el("span", { class: "what" });
let shown;
if (isPair(focused)) {
const [a, b] = focused.split(" ");
what.textContent = name(a) + " – " + name(b);
what.title = focused;
const listed = (x, y) => (state.graph.intended[x] || []).includes(y);
shown = [el("div", { class: "leaf" }, el("span", { class: "key" }, "intended: "),
listed(a, b) || listed(b, a) ? "yes (member list)" : "no")];
// Each end's view of it, as it reported it.
for (const [x, y, path] of [[a, b, "from"], [b, a, "to"]]) {
const report = state.graph.measured[x];
const link = report && report.links.find(link => link.peer === y);
if (link) {
shown.push(tree(name(x) + " reports", { secsAgo: report.secsAgo, ...link }, path));
} else {
shown.push(el("div", { class: "key leaf" }, name(x) + (report
? " reports no link to " + name(y) + "." : " reports no links.")));
}
}
title.replaceChildren("Link: ", what);
document.getElementById("stats").replaceChildren(...shown);
return;
}
if (focused === null) {
what.textContent = name(state.node.id) + " (this node)";
shown = [tree("stats", state.stats, "stats")];
} else {
// Its alias (if it has one) and its node ID, in full.
const alias = (state.graph.members[focused] || {}).alias ||
(state.peers.peers[focused] || {}).alias;
what.replaceChildren(...(alias ? [alias, " "] : []), el("span", { class: "id" }, focused));
const peer = state.peers.peers[focused];
const report = state.graph.measured[focused];
shown = [];
if (peer) shown.push(tree("peer", peer, "peer"));
else shown.push(el("div", { class: "key leaf" }, "Not a peer of this node."));
if (report) shown.push(tree("links", report, "links"));
}
title.replaceChildren(focused === null ? "Figures: " : "Peer: ", what);
document.getElementById("stats").replaceChildren(...shown);
}
// --- Swarm map: a small force layout, positions kept across renders ---
const positions = new Map();
// Nodes put somewhere by hand (dragged): the layout leaves them there.
const pinned = new Set();
const transportColour = new Map([["mycelium", "#2563eb"], ["libp2p", "#9333ea"],
["tor", "#0891b2"]]);
const SPARE = ["#ca8a04", "#db2777", "#65a30d"];
function colourOf(transport) {
if (!transport) return "var(--muted)";
if (!transportColour.has(transport)) {
transportColour.set(transport, SPARE[(transportColour.size - 3) % SPARE.length]);
}
return transportColour.get(transport);
}
function renderLegend(measured) {
const transports = new Set();
for (const { link } of measured.values()) {
transports.add(link.transport || "");
for (const other of link.others || []) transports.add(other.transport);
}
const items = [el("span", { class: "intended" }, "intended (member list)")];
for (const transport of [...transports].sort()) {
const item = el("span", {}, transport || "unknown transport");
item.style.setProperty("--colour", colourOf(transport || null));
items.push(item);
}
items.push(el("span", { class: "used" }, "in use"),
el("span", { class: "other" }, "other transport"),
el("span", { class: "direct" }, "direct"),
el("span", { class: "relayed" }, "relayed"),
el("span", { class: "dormant" }, "dormant"),
el("span", { class: "silent" }, "an end reports no links"));
document.getElementById("legend").replaceChildren(...items);
}
function edges() {
const intended = new Map();
for (const [a, neighbours] of Object.entries(state.graph.intended)) {
for (const b of neighbours) {
intended.set(pairKey(a, b), [a, b]);
}
}
// One measured edge per pair: a report with an RTT, then the fresher.
const measured = new Map();
for (const [a, report] of Object.entries(state.graph.measured)) {
for (const link of report.links) {
const key = pairKey(a, link.peer);
const known = measured.get(key);
const timed = typeof link.rttMs === "number";
const knownTimed = known && typeof known.link.rttMs === "number";
if (!known || (timed && !knownTimed) ||
(timed === knownTimed && report.secsAgo < known.secsAgo)) {
measured.set(key, { a, b: link.peer, link, secsAgo: report.secsAgo,
dormant: link.dormant || (known && known.dormant) });
} else if (link.dormant) {
known.dormant = true;
}
}
}
// Dormant if either end holds the other so, whichever report is drawn.
for (const edge of measured.values()) {
if (edge.dormant && !edge.link.dormant) edge.link = { ...edge.link, dormant: true };
}
return { intended, measured };
}
function layout(nodes, pairs, width, height) {
for (const id of nodes) {
if (!positions.has(id)) {
positions.set(id, { x: width / 2 + (Math.random() - .5) * width / 2,
y: height / 2 + (Math.random() - .5) * height / 2 });
}
}
const ideal = Math.min(width, height) / Math.max(2, Math.sqrt(nodes.length) * 1.5);
for (let round = 0; round < 120; round++) {
const force = new Map(nodes.map(id => [id, { x: 0, y: 0 }]));
for (let i = 0; i < nodes.length; i++) {
for (let j = i + 1; j < nodes.length; j++) {
const p = positions.get(nodes[i]), q = positions.get(nodes[j]);
const dx = p.x - q.x, dy = p.y - q.y, d2 = Math.max(dx * dx + dy * dy, 1);
const push = ideal * ideal / d2;
force.get(nodes[i]).x += dx * push / 10; force.get(nodes[i]).y += dy * push / 10;
force.get(nodes[j]).x -= dx * push / 10; force.get(nodes[j]).y -= dy * push / 10;
}
}
for (const [a, b] of pairs) {
const p = positions.get(a), q = positions.get(b);
if (!p || !q) continue;
const dx = q.x - p.x, dy = q.y - p.y, d = Math.max(Math.hypot(dx, dy), 1);
const pull = (d - ideal) / d / 4;
force.get(a).x += dx * pull; force.get(a).y += dy * pull;
force.get(b).x -= dx * pull; force.get(b).y -= dy * pull;
}
for (const id of nodes) {
if (pinned.has(id)) continue;
const p = positions.get(id), f = force.get(id);
p.x = Math.min(width - 40, Math.max(40, p.x + Math.max(-10, Math.min(10, f.x))));
p.y = Math.min(height - 20, Math.max(20, p.y + Math.max(-10, Math.min(10, f.y))));
}
}
}
// The node or link (its pair key) under the pointer, if any. Kept here rather than
// left to :hover: its halo is an element of its own, drawn behind it.
let hovered = null;
function hover(id) {
if (hovered === id) return;
hovered = id;
if (state) renderGraph();
}
function hoverable(element, id) {
element.addEventListener("mouseenter", () => hover(id));
element.addEventListener("mouseleave", () => hover(null));
}
// The map's elements by what they show (a key), kept across renders and updated in
// place: the one under the pointer stays itself.
const drawn = new Map();
// The element `key` names, with exactly `attrs`; `made` sets up a new one (its
// listeners).
function drawing(key, tag, attrs, made) {
let node = drawn.get(key);
if (!node) {
node = svg(tag);
if (made) made(node);
drawn.set(key, node);
}
for (const attr of node.getAttributeNames()) if (!(attr in attrs)) node.removeAttribute(attr);
for (const [attr, value] of Object.entries(attrs)) {
if (node.getAttribute(attr) !== String(value)) node.setAttribute(attr, value);
}
return node;
}
// A label's `attrs`, turned back where the map is turned (`view`): upright, about where
// it is anchored.
function upright(attrs) {
if (!view.turn) return attrs;
return { ...attrs, transform: "rotate(" + -degrees(view.turn) + " " + attrs.x + " " +
attrs.y + ")" };
}
function text(node, content) {
if (node.textContent !== content) node.textContent = content;
}
function tooltip(node, content) {
let title = node.firstElementChild;
if (!title) node.append(title = svg("title"));
text(title, content);
}
// `root` showing `children`, in order: the others go, and only what is out of place
// moves.
function show(root, children) {
const shown = new Set(children);
for (const [key, node] of drawn) {
if (!shown.has(node)) { node.remove(); drawn.delete(key); }
}
let at = root.firstChild;
for (const node of children) {
if (node === at) at = at.nextSibling; else root.insertBefore(node, at);
}
}
let lastShape = "";
function renderGraph() {
const root = document.getElementById("graph");
const width = root.clientWidth || 800, height = root.clientHeight || 560;
root.setAttribute("viewBox", "0 0 " + width + " " + height);
const nodes = Object.keys(state.graph.members).sort();
const { intended, measured } = edges();
renderLegend(measured);
const pairs = [...intended.values(), ...[...measured.values()].map(m => [m.a, m.b])];
// Laid out anew only when who's there or who links to whom changed.
const shape = nodes.join(",") + "|" + [...intended.keys(), ...measured.keys()].sort().join(",");
if (shape !== lastShape) {
for (const id of [...positions.keys()]) {
if (!nodes.includes(id)) { positions.delete(id); pinned.delete(id); }
}
layout(nodes, pairs, width, height);
lastShape = shape;
}
const children = [];
// Behind a link: a halo while it's hovered or in focus (`width`: of its lines).
const halo = (key, p, q, width) => {
if (key !== hovered && key !== focused) return;
children.push(drawing("halo " + key, "line", { x1: p.x, y1: p.y, x2: q.x, y2: q.y,
stroke: "var(--self)", "stroke-opacity": key === focused ? .35 : .15,
"stroke-width": width + 8, "stroke-linecap": "round" }));
};
// Over a link: an invisible, wider line to point at and click.
const hits = [];
const hit = (key, p, q, width) => {
const line = drawing("hit " + key, "line", { x1: p.x, y1: p.y, x2: q.x, y2: q.y,
stroke: "transparent", "stroke-width": width + 8, cursor: "pointer" }, line => {
// On press: the map may be drawn anew before a click would complete.
line.addEventListener("pointerdown", event => { event.stopPropagation(); focus(key); });
hoverable(line, key);
});
hits.push(line);
return line;
};
for (const [key, [a, b]] of intended) {
if (measured.has(key)) continue;
const p = positions.get(a), q = positions.get(b);
halo(key, p, q, 1);
children.push(drawing("intended " + key, "line", { x1: p.x, y1: p.y, x2: q.x, y2: q.y,
stroke: "var(--intended)", "stroke-dasharray": "4 4", "stroke-width": 1 }));
tooltip(hit(key, p, q, 1), name(a) + " – " + name(b) + ": intended (member list), not measured");
}
const ms = rtt => rtt < 10 ? rtt.toFixed(1) : String(Math.round(rtt));
for (const [key, { a, b, link, secsAgo }] of measured) {
const p = positions.get(a), q = positions.get(b);
if (!p || !q) continue;
// The transport in use thick, in the middle; the others thin, beside it.
const lines = [{ transport: link.transport, rttMs: link.rttMs, used: true }];
for (const other of link.others || []) lines.push({ ...other, used: false });
// As wide as the lines side by side.
const width = 3 + 12 * Math.ceil((lines.length - 1) / 2);
halo(key, p, q, width);
// It covers the lines: their descriptions are its tooltip.
const covering = hit(key, p, q, width);
const descriptions = [];
const length = Math.max(Math.hypot(q.x - p.x, q.y - p.y), 1);
const nx = -(q.y - p.y) / length, ny = (q.x - p.x) / length;
// An end that reports no links (any more): what's drawn may be out of date.
const silent = !(a in state.graph.measured) || !(b in state.graph.measured);
// Dormant: a red underlay as wide as the lines, as a dormant node's red outline.
if (link.dormant) {
children.push(drawing("underlay " + key, "line", { x1: p.x, y1: p.y, x2: q.x, y2: q.y,
stroke: "var(--bad)", "stroke-opacity": .5, "stroke-width": width + 4,
"stroke-linecap": "round" }));
}
lines.forEach((line, i) => {
// 0, then +1, -1, +2, -2 … steps of 6 px to the side.
const side = i === 0 ? 0 : (i % 2 ? 1 : -1) * Math.ceil(i / 2) * 6;
const ox = nx * side, oy = ny * side;
const attrs = { x1: p.x + ox, y1: p.y + oy, x2: q.x + ox, y2: q.y + oy,
stroke: colourOf(line.transport),
// Narrow where dormant (over its underlay).
"stroke-width": link.dormant ? (line.used ? 1.5 : 0.8) : line.used ? 3 : 1.2 };
// Dotted where an end reports nothing, dashed where relayed, solid where direct.
if (silent) {
attrs["stroke-dasharray"] = line.used ? "1 5" : "1 3";
attrs["stroke-linecap"] = "round";
} else if (line.used ? link.relayed : line.relayed) {
attrs["stroke-dasharray"] = "7 4";
}
const drawnLine = drawing("line " + key + " " + i, "line", attrs);
const description = name(a) + " – " + name(b) +
(line.transport ? " via " + line.transport : "") + (line.used ? " (in use)" : "") +
((line.used ? link.relayed : line.relayed) ? ", relayed" : "") + (link.dormant ? ", dormant" : "") +
(silent ? ", one end reports no links" : "") +
(typeof line.rttMs === "number" ? ", " + line.rttMs.toFixed(1) + " ms" : "") +
", measured " + age(secsAgo + elapsed()) + " ago";
tooltip(drawnLine, description);
descriptions.push(description);
children.push(drawnLine);
if (typeof line.rttMs === "number") {
// The one in use at the middle, larger; the others further along, beside theirs.
const t = line.used ? .5 : .3;
const out = line.used ? -4 : Math.sign(side) * 9;
const label = drawing("rtt " + key + " " + i, "text", upright({
x: p.x + (q.x - p.x) * t + ox + nx * out,
y: p.y + (q.y - p.y) * t + oy + ny * out + (line.used ? 0 : 3),
"text-anchor": "middle", "font-size": line.used ? 11 : 9,
fill: line.used ? "var(--fg)" : "var(--muted)" }));
text(label, ms(line.rttMs));
children.push(label);
}
});
tooltip(covering, descriptions.join("\n"));
}
// Above the lines and their labels, below the nodes.
children.push(...hits);
for (const id of nodes) {
const p = positions.get(id), member = state.graph.members[id];
const reported = id in state.graph.measured;
const shown = focused === null ? member.self : id === focused;
// A link in focus: both ends ringed.
// A halo as links have: light under the pointer, stronger in focus.
if (shown || id === hovered) {
children.push(drawing("ring " + id, "circle", { cx: p.x, cy: p.y, r: 13,
fill: "var(--self)", "fill-opacity": shown ? .35 : .15, stroke: "none" }));
}
const pressed = element => {
element.addEventListener("pointerdown", event => { event.stopPropagation(); drag(event, id); });
element.addEventListener("dblclick", () => unpin(id));
hoverable(element, id);
};
// Dormant as this node sees it (`/peers`): a red outline.
const dormant = (state.peers.peers[id] || {}).status === "dormant";
const circle = drawing("node " + id, "circle", { cx: p.x, cy: p.y, r: member.self ? 8 : 6,
fill: member.self ? "var(--self)" : reported ? "var(--fg)" : "var(--panel)",
stroke: member.self ? "var(--self)" : dormant ? "var(--bad)" : "var(--fg)",
"stroke-width": dormant ? 2.5 : 1.5 }, pressed);
const clock = (state.peers.peers[id] || {}).clock;
tooltip(circle, id + (reported ? "" : " (no links reported)") +
(dormant ? " (dormant)" : "") +
(clockOff(clock) ? " (clock " + seconds(clock.offsetMs) + " off this node's)" : ""));
const label = drawing("name " + id, "text", upright({ x: p.x + 10, y: p.y + 4,
"font-size": 12, fill: "var(--fg)", cursor: "pointer" }), pressed);
text(label, name(id));
children.push(circle, label);
}
show(document.getElementById("view"), children);
}
// --- Document: read a level at a time (`/store?shallow=true`) as it is opened, and
// read again where the node says it changed (`document` events) ---
// What is open, by path (as JSON): the first level to begin with.
const documentOpen = new Set([JSON.stringify([])]);
// The open branches read, by path (as JSON): to read again on a change.
const documentBranches = new Map();
function storeUrl(path, shallow) {
const where = path.length ? "../store/" + path.map(encodeURIComponent).join("/") : "../store";
return where + (shallow ? "?shallow=true" : "");
}
// Store paths split at "/": a key with one (or an empty key) can't be read on its own.
const addressable = path => path.every(segment => segment !== "" && !segment.includes("/"));
// Either is within the other.
const related = (a, b) => a.length <= b.length
? a.every((segment, i) => segment === b[i]) : related(b, a);
function describe(summary) {
switch (summary.type) {
case "map": return "{" + summary.size + (summary.size === 1 ? " key}" : " keys}");
case "list": return "[" + summary.size + (summary.size === 1 ? " item]" : " items]");
case "text": return "text, " + summary.size + " characters";
default: return summary.type + ("size" in summary ? ", " + summary.size + " bytes" : "");
}
}
async function readStore(path, shallow) {
const response = await fetch(storeUrl(path, shallow), { headers: { Accept: "application/json" } });
if (!response.ok) throw new Error("HTTP " + response.status);
return response.json();
}
// An empty map, list or text: shown as it is, nothing to open.
const EMPTY = { map: "{}", list: "[]", text: "\"\"" };
const EMPTY_VALUE = { map: () => ({}), list: () => [], text: () => "" };
// --- Editing: a double click on an entry turns it into a field holding its contents;
// saved with PUT /store/<path> (the whole value, objects too) ---
// A string is edited as text (sent as text/plain), anything else as JSON; "JSON"
// switches. `done(saved, response)` when saved or cancelled.
// `options` for adding rather than replacing: `extra`, a short field before the value
// (`{ label, initial, hint }`: the key, or the index); `check(extra)`, an error text if
// it won't do; `send(body, type, extra)`, the request (PUT to `path` without).
function editor(path, value, done, options = {}) {
const message = el("span", { class: "note" });
const fail = text => { message.className = "error"; message.textContent = text; };
const asText = typeof value === "string";
const text = asText ? value : JSON.stringify(value, null, 2);
const field = el("textarea", { spellcheck: "false",
rows: String(Math.max(2, Math.min(20, text.split("\n").length + 1))) });
field.value = text;
const json = el("input", { type: "checkbox" });
json.checked = !asText;
json.addEventListener("change", () => {
if (json.checked) { field.value = JSON.stringify(field.value); return; }
try {
const parsed = JSON.parse(field.value);
if (typeof parsed !== "string") throw new Error("not a string");
field.value = parsed;
} catch {
json.checked = true;
fail("Only a JSON string can be edited as text.");
}
});
const extra = options.extra
? el("input", { type: "text", spellcheck: "false", class: "extra",
placeholder: options.extra.label, title: options.extra.hint || options.extra.label })
: null;
if (extra) extra.value = options.extra.initial || "";
const send = options.send || ((body, type) => fetch(storeUrl(path, false),
{ method: "PUT", body, headers: { "Content-Type": type } }));
const save = el("button", { type: "button" }, options.extra ? "Add" : "Save");
const cancel = el("button", { type: "button" }, "Cancel");
const submit = async () => {
const body = field.value;
const problem = extra && options.check ? options.check(extra.value) : null;
if (problem) { fail(problem); return; }
if (json.checked) {
try { JSON.parse(body); } catch (error) {
fail("Not JSON: " + error.message); return;
}
}
save.disabled = true;
message.className = "note";
message.textContent = "Saving…";
try {
const response = await send(body, json.checked ? "application/json" : "text/plain",
extra ? extra.value : null);
if (!response.ok) {
// The node says why (`{"error": …}`), where it does.
let why = response.status === 403 ? "not allowed" : "";
try { why = (await response.json()).error || why; } catch { /* no body */ }
throw new Error("HTTP " + response.status + (why ? ": " + why : ""));
}
done(true, response);
} catch (error) {
save.disabled = false;
fail("Not saved: " + error.message);
}
};
save.addEventListener("click", submit);
cancel.addEventListener("click", () => done(false));
// Enter in the short field saves; in the area, Ctrl or ⌘ and Enter does.
const keys = (input, line) => input.addEventListener("keydown", event => {
if (event.key === "Escape") { event.preventDefault(); done(false); }
else if (event.key === "Enter" && (line || event.ctrlKey || event.metaKey)) {
event.preventDefault(); submit();
}
});
keys(field, false);
if (extra) keys(extra, true);
setTimeout(() => (extra && !extra.value ? extra : field).focus());
return el("div", { class: "editor" }, ...(extra ? [extra] : []), field,
el("div", {}, save, " ", cancel, " ", el("label", {}, json, " JSON"), " ",
el("span", { class: "note" }, "Ctrl+Enter saves, Esc cancels"), " ", message));
}
// Store paths name keys below the root; the root itself isn't written whole.
const editable = path => path.length > 0 && addressable(path);
// Branches whose reading again waited for an edit in them to end, by path (as JSON).
const documentDeferred = new Set();
// After an edit: what changed is read again (the node's `document` event follows),
// and what was waiting for the edit; `opened`, what it made, shown open.
function edited(path, saved, opened = path) {
if (saved) documentOpen.add(JSON.stringify(opened));
release();
const waiting = [...documentDeferred].map(id => JSON.parse(id));
documentDeferred.clear();
if (saved || waiting.length) documentChanged({ paths: saved ? [path, ...waiting] : waiting });
}
// Whether `element` holds a field being edited: left as it is until it's done.
const editing = element => element.querySelector(".editor") !== null;
// Adding to a map (a key and its value, PUT /store/<path>/<key>) or a list (an index
// and the value, POST /store/<path>/<index>: the items from there on move up; -1 is the
// end), without writing it whole: a "+" on the row, the field below it. `known()`: a
// map's keys as last read, so an existing one isn't overwritten.
function addButton(kind, path, known, place) {
const map = kind === "map";
const button = el("button", { type: "button", class: "add",
title: map ? "Add a key" : "Insert an item" }, "+");
button.addEventListener("click", event => {
// Not a click on the row: it would open or close it.
event.preventDefault();
event.stopPropagation();
const area = place();
if (editing(area)) return;
const form = editor(path, "", async (saved, response) => {
form.remove();
let added = path;
if (saved) {
if (map) added = [...path, form.dataset.extra];
else {
try { added = [...path, String((await response.json()).index)]; } catch { /* path */ }
}
}
edited(path, saved, added);
}, {
extra: map
? { label: "key", initial: "" }
: { label: "index", initial: "-1", hint: "where: 0 is the first; -1 the end" },
check: extra => {
form.dataset.extra = extra;
return map
? (extra === "" ? "A key, please."
: extra.includes("/") ? "A key with \"/\" can't be named in a path."
: known().includes(extra) ? "\"" + extra + "\" exists already: edit it instead."
: null)
: (/^(-1|\d+)$/.test(extra.trim()) ? null : "The index: 0 or more, or -1 for the end.");
},
send: (body, type, extra) => fetch(storeUrl([...path, map ? extra : extra.trim()], false),
{ method: map ? "PUT" : "POST", body, headers: { "Content-Type": type } }),
});
area.prepend(form);
});
return button;
}
function editableLeaf(key, shown, value, path) {
const leaf = el("div", { class: "leaf" }, el("span", { class: "key" }, key + ": "), shown);
if (!editable(path)) return leaf;
leaf.title = "Double-click to edit";
leaf.addEventListener("dblclick", event => {
if (editing(leaf)) return;
event.preventDefault();
window.getSelection().removeAllRanges();
const before = [...leaf.childNodes];
leaf.replaceChildren(before[0], editor(path, value, saved => {
leaf.replaceChildren(...before);
edited(path, saved);
}));
});
return leaf;
}
// One entry: a short scalar as it is; anything else a branch read when opened. A
// branch's entries are kept across reads, so what's open inside stays open.
function documentEntry(key, summary, path) {
if (summary.size === 0 && summary.type in EMPTY) {
const leaf = editableLeaf(key, EMPTY[summary.type], EMPTY_VALUE[summary.type](), path);
// An empty map or list takes its first entry here: "+" on its row, the field below.
if ((summary.type === "map" || summary.type === "list") && editable(path)) {
const below = el("div", { class: "nested" });
leaf.append(" ", addButton(summary.type, path, () => [], () => below));
return el("div", {}, leaf, below);
}
return leaf;
}
if ("value" in summary) {
return editableLeaf(key, JSON.stringify(summary.value), summary.value, path);
}
const details = el("details", {});
const described = document.createTextNode(describe(summary));
const head = el("summary", {}, el("span", { class: "key" }, key), " ", described);
details.append(head);
// A double click edits the whole of it: read, then shown in a field.
if (editable(path)) {
head.title = "Double-click to edit";
head.addEventListener("mousedown", event => { if (event.detail > 1) event.preventDefault(); });
head.addEventListener("dblclick", async event => {
event.preventDefault();
if (details.querySelector(":scope > .editor")) return;
let value;
try { value = await readStore(path, false); } catch (error) {
described.textContent = describe(summary) + " (not read: " + error.message + ")";
return;
}
details.open = true;
details.classList.add("editing");
head.after(editor(path, value, saved => {
details.querySelector(":scope > .editor").remove();
details.classList.remove("editing");
edited(path, saved);
}));
});
}
// A newer summary from the parent: a branch of the same kind stays as it is.
details.updated = newer => {
summary = newer;
described.textContent = describe(newer);
};
details.sameKind = newer => !("value" in newer) && newer.type === summary.type;
if (!addressable(path)) {
details.append(el("div", { class: "note" }, "Its path can't be read on its own (a key with \"/\")."));
return details;
}
const id = JSON.stringify(path);
const children = new Map();
const browsed = summary.type === "map" || summary.type === "list";
// Adding: on the row, the field just below it (the branch opened for it).
if (browsed && (editable(path) || path.length === 0)) {
head.append(" ", addButton(summary.type, path, () => [...children.keys()], () => {
details.open = true;
return { prepend: form => head.after(form), querySelector: q => details.querySelector(":scope > " + q) };
}));
}
let read = false;
const fill = async () => {
// Being edited as a whole: read again once that's done.
if (details.classList.contains("editing")) { documentDeferred.add(id); return; }
try {
if (browsed) {
const shallow = await readStore(path, true);
details.updated(shallow);
const entries = shallow.entries || {};
// A list's items by index (the node sends them sorted as text).
const keys = Object.keys(entries);
if (summary.type === "list") keys.sort((a, b) => Number(a) - Number(b));
for (const [k, child] of children) {
if (k in entries) continue;
// Being edited: kept until that's done.
if (editing(child.element)) { documentDeferred.add(id); continue; }
child.element.remove();
children.delete(k);
}
for (const k of keys) {
const newer = entries[k];
const known = children.get(k);
if (known && JSON.stringify(known.summary) === JSON.stringify(newer)) continue;
if (known && editing(known.element)) { documentDeferred.add(id); continue; }
if (known && known.element.sameKind && known.element.sameKind(newer)) {
known.element.updated(newer);
known.summary = newer;
continue;
}
const element = documentEntry(k, newer, [...path, k]);
if (known) known.element.replaceWith(element);
children.set(k, { element, summary: newer });
}
// In order; moving keeps their state.
details.querySelectorAll(":scope > .note").forEach(note => note.remove());
if (!children.size) details.append(el("div", { class: "note" }, "empty"));
for (const k of keys) if (children.has(k)) details.append(children.get(k).element);
} else {
const value = await readStore(path, false);
const shown = el("pre", {}, typeof value === "string" ? value : JSON.stringify(value, null, 2));
const before = details.querySelector(":scope > pre");
if (before) before.replaceWith(shown); else details.append(shown);
}
} catch (error) {
details.querySelectorAll(":scope > .note").forEach(note => note.remove());
details.append(el("div", { class: "note error" }, "Not read: " + error.message));
}
};
const open = () => {
documentOpen.add(id);
documentBranches.set(id, { path, element: details, refresh: fill });
if (!read) { read = true; fill(); }
};
details.addEventListener("toggle", () => {
if (details.open) open();
else { documentOpen.delete(id); documentBranches.delete(id); }
});
if (documentOpen.has(id)) { details.open = true; open(); }
return details;
}
// The node says what changed (paths), or that anything may have (`all`).
// Changes waiting while text in the document box is selected (`busy`): merged, applied
// after. A field being edited holds only what it is in (`editing`, `documentDeferred`).
let documentPending = null;
function documentChanged(change) {
if (busy(document.getElementById("document-box"))) {
documentPending = documentPending === null ? change
: documentPending.all || change.all ? { all: true }
: { paths: [...documentPending.paths, ...change.paths] };
return;
}
for (const [id, branch] of documentBranches) {
if (!branch.element.isConnected) { documentBranches.delete(id); continue; }
if (change.all || change.paths.some(path => related(path, branch.path))) branch.refresh();
}
}
document.getElementById("document").replaceChildren(
documentEntry("store", { type: "map", size: "…" }, []));
// A box is busy while text in it is selected: drawing it anew would lose the selection,
// so it waits (`held`) until it's gone.
function busy(box) {
const selection = window.getSelection();
if (!selection || selection.isCollapsed || !selection.rangeCount) return false;
return box.contains(selection.getRangeAt(0).commonAncestorContainer);
}
let held = false;
function render(ages = false) {
if (!state) return;
document.getElementById("node").textContent =
(state.node.alias ? state.node.alias + " · " : "") + state.node.id;
const skew = state.stats.clock;
document.getElementById("clock-warning").textContent = skew && skew.off
? "clock " + seconds(skew.offsetMs) + " off its peers'" : "";
held = false;
const boxes = [["peers-box", renderPeers], ["figures-box", renderStats]];
// Its ages are in tooltips only: drawn on events, not every second.
if (!ages) boxes.push(["map", renderGraph]);
for (const [box, draw] of boxes) {
if (busy(document.getElementById(box))) held = true; else draw();
}
}
// What waited for a box to be free: drawn, or applied, now.
function release() {
if (held) render();
if (documentPending !== null && !busy(document.getElementById("document-box"))) {
const change = documentPending;
documentPending = null;
documentChanged(change);
}
}
document.addEventListener("selectionchange", release);
// The legend, hidden and shown again; the map takes the room.
const legendToggle = document.getElementById("legend-toggle");
legendToggle.addEventListener("click", () => {
const legends = document.getElementById("legends");
legends.hidden = !legends.hidden;
legendToggle.textContent = legends.hidden ? "show legend" : "hide legend";
if (state) renderGraph();
});
// --- Pan, zoom and turn: the map's group moved, scaled and turned (`turn`, in
// radians). Lines, labels and nodes scale with it, as on a map; labels stay upright
// (`upright`). ---
const graph = document.getElementById("graph");
const view = { x: 0, y: 0, k: 1, turn: 0 };
const degrees = radians => radians * 180 / Math.PI;
function moveView() {
document.getElementById("view").setAttribute("transform",
"translate(" + view.x + " " + view.y + ") rotate(" + degrees(view.turn) + ") scale(" +
view.k + ")");
}
// `[x, y]` turned by `angle`.
function turned(x, y, angle) {
const c = Math.cos(angle), s = Math.sin(angle);
return [x * c - y * s, x * s + y * c];
}
// Where the pointer is, in the map's own units (its `viewBox` is its size).
function pointer(event) {
const box = graph.getBoundingClientRect();
return { x: event.clientX - box.left, y: event.clientY - box.top };
}
// How far it zooms: from a quarter to eight times.
const zoomed = k => Math.min(8, Math.max(.25, k));
// The wheel zooms around the pointer.
graph.addEventListener("wheel", event => {
event.preventDefault();
const at = pointer(event);
const k = zoomed(view.k * Math.exp(-event.deltaY * .002));
view.x = at.x - (at.x - view.x) * k / view.k;
view.y = at.y - (at.y - view.y) * k / view.k;
view.k = k;
moveView();
}, { passive: false });
// A press on the map: dragged (more than a few pixels), it `move`s by as much as the
// pointer did; let go where pressed, it's a `click`.
let press = null;
function pressing(event, move, click) {
press = { from: pointer(event), moved: false, move, click };
graph.setPointerCapture(event.pointerId);
}
// Fingers on the map, by pointer. Two pinch: the map zooms around the point between
// them, moves with it, and turns as they do. A press (`pressing`) is given up when the
// second comes.
const touching = new Map();
let pinch = null;
const between = (a, b) => ({ x: (a.x + b.x) / 2, y: (a.y + b.y) / 2 });
// From the first two fingers as they are now.
function pinchFrom() {
const [one, two] = touching.values();
pinch = { view: { ...view }, at: between(one, two),
distance: Math.max(Math.hypot(two.x - one.x, two.y - one.y), 1),
angle: Math.atan2(two.y - one.y, two.x - one.x) };
}
function pinched() {
const [one, two] = touching.values();
const at = between(one, two);
const k = zoomed(pinch.view.k * Math.hypot(two.x - one.x, two.y - one.y) / pinch.distance);
const turn = pinch.view.turn + Math.atan2(two.y - one.y, two.x - one.x) - pinch.angle;
// What was between the fingers (on the map, unturned and unscaled) stays between them.
const [x, y] = turned(pinch.at.x - pinch.view.x, pinch.at.y - pinch.view.y, -pinch.view.turn);
const [dx, dy] = turned(x * k / pinch.view.k, y * k / pinch.view.k, turn);
Object.assign(view, { x: at.x - dx, y: at.y - dy, k, turn });
moveView();
// Its labels upright again.
if (state) renderGraph();
}
// Before the map's own handlers (a node's included): a second finger takes over.
graph.addEventListener("pointerdown", event => {
if (event.pointerType !== "touch") return;
touching.set(event.pointerId, pointer(event));
graph.setPointerCapture(event.pointerId);
if (touching.size < 2) return;
press = null;
graph.classList.remove("dragging");
pinchFrom();
event.stopImmediatePropagation();
}, true);
// A finger lifted: the others pinch on from where they are, or (one left) do nothing
// until lifted too.
function untouched(event) {
if (!touching.delete(event.pointerId)) return;
if (touching.size >= 2) pinchFrom(); else pinch = null;
}
graph.addEventListener("pointermove", event => {
if (touching.has(event.pointerId)) touching.set(event.pointerId, pointer(event));
if (pinch) { pinched(); return; }
if (!press) return;
const at = pointer(event);
const dx = at.x - press.from.x, dy = at.y - press.from.y;
if (!press.moved && Math.hypot(dx, dy) < 4) return;
press.moved = true;
graph.classList.add("dragging");
press.move(dx, dy);
});
graph.addEventListener("pointerup", event => {
untouched(event);
const click = press && !press.moved ? press.click : null;
press = null;
graph.classList.remove("dragging");
if (click) click();
});
graph.addEventListener("pointercancel", event => {
untouched(event);
press = null;
graph.classList.remove("dragging");
});
// Beside the nodes: dragged, it pans; a click, back to this node.
graph.addEventListener("pointerdown", event => {
if (event.target !== graph) return;
const from = { ...view };
pressing(event, (dx, dy) => {
view.x = from.x + dx;
view.y = from.y + dy;
moveView();
}, () => focus(null));
});
// A node: dragged, it stays where it is put (`pinned`), and the layout places the others
// around it; a click, it is in focus.
function drag(event, id) {
const p = positions.get(id), from = { x: p.x, y: p.y };
pressing(event, (dx, dy) => {
// The pointer's move, on the map (unturned and unscaled).
const [x, y] = turned(dx, dy, -view.turn);
p.x = from.x + x / view.k;
p.y = from.y + y / view.k;
pinned.add(id);
renderGraph();
}, () => focus(id));
}
// A node let go: the layout places it again.
function unpin(id) {
if (!pinned.delete(id)) return;
lastShape = "";
renderGraph();
}
// A double-click beside the nodes: the whole map again.
graph.addEventListener("dblclick", event => {
if (event.target !== graph) return;
Object.assign(view, { x: 0, y: 0, k: 1, turn: 0 });
moveView();
if (state) renderGraph();
});
// Beside the nodes, or off the map: nothing hovered (the element left may be gone).
graph.addEventListener("mousemove", event => { if (event.target === graph) hover(null); });
graph.addEventListener("mouseleave", () => hover(null));
// --- Events ---
const connection = document.getElementById("connection");
const dot = document.getElementById("dot");
// One breath per event from the node.
function pulse() {
dot.classList.remove("pulse");
void dot.offsetWidth; // restarts the animation
dot.classList.add("pulse");
}
function status(text, live) {
document.getElementById("connection-text").textContent = text;
connection.className = live ? "live" : "down";
document.body.classList.toggle("stale", !live && state !== null);
}
// While not live, what is shown stays as it was last (ages don't count on).
let live = false;
let events = null;
// The next attempt, while one is waited for: a connect now replaces it.
let retry = null;
function connect() {
clearTimeout(retry);
retry = null;
events = new EventSource("dashboard/events");
events.addEventListener("snapshot", event => {
const snapshot = JSON.parse(event.data);
if (snapshot.page !== PAGE_VERSION) {
events.close();
status("new version; reloading…", false);
location.reload();
return;
}
// Changes while not connected went unseen: what is open is read again.
if (state !== null) documentChanged({ all: true });
state = snapshot; stateAt = Date.now(); live = true;
status("live", true); pulse(); render();
});
events.addEventListener("patch", event => {
if (!state) return;
state = mergePatch(state, JSON.parse(event.data)); stateAt = Date.now(); pulse(); render();
});
events.addEventListener("document", event => { pulse(); documentChanged(JSON.parse(event.data)); });
// The node stops: it says so, and ends the stream. Back once it is.
events.addEventListener("offline", () => {
events.close(); live = false;
status("node stopped; reconnecting…", false);
retry = setTimeout(connect, 3000);
});
events.addEventListener("error", () => {
// Each attempt that failed: a breath too, so it shows it keeps trying.
pulse();
live = false;
if (events.readyState === EventSource.CLOSED) {
// Given up (an HTTP error, e.g. the node is up but not serving the page yet).
status("disconnected; retrying…", false);
retry = setTimeout(connect, 5000);
} else {
// EventSource reconnects by itself; the node sends a snapshot first again.
status("reconnecting…", false);
}
});
}
connect();
// A page not shown (another tab, a minimised window) is paused: hidden for a while, it
// closes its stream, so the node stops building updates and asking members for their
// links for it; shown again, it reconnects. Briefly hidden, nothing changes.
const PAUSE_AFTER = 30000;
let paused = false;
let pausing = null;
document.addEventListener("visibilitychange", () => {
if (document.hidden) {
pausing = setTimeout(() => {
pausing = null;
paused = true;
clearTimeout(retry);
retry = null;
if (events) events.close();
live = false;
status("paused while hidden", false);
}, PAUSE_AFTER);
} else {
clearTimeout(pausing);
pausing = null;
if (paused) {
paused = false;
status("reconnecting…", false);
connect();
}
}
});
// A click on the status: live, everything now (a tick on the node, the members asked
// again, what's open of the document read again); otherwise, reconnecting now.
connection.title = "Click to refresh now";
connection.style.cursor = "pointer";
connection.addEventListener("click", () => {
pulse();
if (live) {
fetch("dashboard/refresh", { method: "POST" }).catch(() => {});
documentChanged({ all: true });
} else {
if (events) events.close();
status("reconnecting…", false);
connect();
}
});
// Ages count on between events; nothing else changes without one.
setInterval(() => { if (live) render(true); }, 1000);
window.addEventListener("resize", () => { lastShape = ""; render(); });
</script>
</body>
</html>
|
