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Copy pathvis.py
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1035 lines (913 loc) · 43.6 KB
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# /// script
# requires-python = ">=3.10"
# dependencies = [
# "aiofiles",
# "fastapi",
# "jinja2",
# "uvicorn[standard]",
# "watchdog",
# ]
# ///
import asyncio
import json
import logging
import time
from pathlib import Path
from typing import Dict, Optional
import aiofiles
import uvicorn
from fastapi import FastAPI, HTTPException, Request, WebSocket, WebSocketDisconnect
from fastapi.responses import HTMLResponse
from jinja2 import Template
from watchdog.events import FileSystemEvent, FileSystemEventHandler
from watchdog.observers import Observer
# --- Configuration ---
BASE_DIR = Path("/tmp/alphasnake")
LIVE_DIR = BASE_DIR / "live"
STATIC_GAME_DIR = BASE_DIR
LOG_LEVEL = logging.INFO
HOST = "0.0.0.0"
PORT = 8000
# Ensure directories exist
LIVE_DIR.mkdir(parents=True, exist_ok=True)
STATIC_GAME_DIR.mkdir(parents=True, exist_ok=True)
# --- Logging Setup ---
logging.basicConfig(level=LOG_LEVEL, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)
# --- FastAPI App ---
app = FastAPI()
# --- HTML Template (Embedded) ---
# Note: Using Jinja2 Template for variable substitution within the string
html_template_str = """
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Snake Game Visualizer - {{ title_suffix }}</title>
<style>
/* --- CSS Variables for Theme --- */
:root {
--bg-color: #1a1a1a; /* Slightly lighter main background */
--surface-color: #242424; /* Cards, inputs background */
--muted-surface-color: #2d2d2d; /* Less prominent surfaces */
--border-color: #404040;
--text-color: #e0e0e0;
--text-muted-color: #aaaaaa;
--accent-a-primary: #ff5252; /* Red */
--accent-a-secondary: #c62828; /* Darker Red */
--accent-b-primary: #448aff; /* Blue */
--accent-b-secondary: #1565c0; /* Darker Blue */
--portal-color: #6a1b9a; /* Purple for portals */
--portal-highlight-color: #ab47bc;
--wall-color: #555555;
--grid-border-color: #333; /* Color for grid lines */
--font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue",
sans-serif;
--font-mono: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
--cell-size: 20px;
--grid-size: 32; /* Default, will be updated by JS */
}
body {
font-family: var(--font-sans);
max-width: 1000px;
margin: 20px auto; /* Add top/bottom margin */
padding: 20px;
background-color: var(--bg-color);
color: var(--text-color);
line-height: 1.6;
}
h1 {
text-align: center;
color: var(--text-color);
margin-bottom: 25px;
}
p {
color: var(--text-muted-color);
margin-bottom: 10px;
}
#game-info {
margin-bottom: 20px; /* Consistent spacing */
padding: 15px;
background-color: var(--surface-color);
border: 1px solid var(--border-color);
border-radius: 6px;
display: flex;
justify-content: space-between;
align-items: center; /* Vertically align items */
font-size: 0.95rem;
min-height: 40px; /* Ensure consistent height */
flex-wrap: wrap; /* Allow wrapping on smaller screens if needed */
}
#game-info > div {
flex: 1; /* Allow divs to take space */
text-align: center;
padding: 5px 10px; /* Add some padding, adjust vertical padding */
min-width: 120px; /* Give elements minimum width */
}
#game-info > div:first-child {
text-align: left;
}
#game-info > div:last-child {
text-align: right;
}
#heuristic-value, #buffer-size-value {
font-weight: bold;
}
#visualization {
display: grid;
grid-template-columns: repeat(var(--grid-size), var(--cell-size));
grid-template-rows: repeat(var(--grid-size), var(--cell-size));
margin-top: 20px;
border: 1px solid var(--grid-border-color); /* Outer border */
margin-left: auto; /* Center the grid */
margin-right: auto; /* Center the grid */
overflow: hidden; /* Prevent content spillover */
/* Set initial size based on default grid size */
width: calc(
var(--grid-size) * var(--cell-size) + (var(--grid-size) - 1) * 0px + 2px /* Adjusted for no gap */
);
height: calc(
var(--grid-size) * var(--cell-size) + (var(--grid-size) - 1) * 0px + 2px /* Adjusted for no gap */
);
}
.cell {
width: var(--cell-size);
height: var(--cell-size);
position: relative;
background-color: var(--muted-surface-color);
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
box-sizing: border-box; /* Include border in size */
border-right: 1px solid var(--grid-border-color);
border-bottom: 1px solid var(--grid-border-color);
transition: background-color 0.1s ease; /* Faster transition */
}
/* Remove border from last column and row - adjusted for dynamic grid size */
.cell:nth-child(var(--grid-size)n) {
border-right: none;
}
#visualization > .cell:nth-last-child(-n + var(--grid-size)) {
border-bottom: none;
}
.wall { background-color: var(--wall-color); }
.apple {
width: calc(var(--cell-size) * 0.6); height: calc(var(--cell-size) * 0.6);
border-radius: 50%; background-color: var(--accent-a-primary);
box-shadow: 0 0 4px rgba(255, 82, 82, 0.7);
}
.trap-a, .trap-b {
font-size: calc(var(--cell-size) * 0.8); line-height: 1; font-weight: bold;
text-shadow: 0 0 3px rgba(0, 0, 0, 0.5);
}
.trap-a { color: var(--accent-a-primary); }
.trap-b { color: var(--accent-b-primary); }
.portal { background-color: var(--portal-color); cursor: pointer; }
.portal-highlight { background-color: var(--portal-highlight-color); box-shadow: 0 0 8px var(--portal-highlight-color); }
.snake-head {
width: calc(var(--cell-size) * 0.8); height: calc(var(--cell-size) * 0.8);
position: relative; display: flex; align-items: center; justify-content: center;
border-radius: 3px;
}
.snake-head-a { background-color: var(--accent-a-primary); color: white; box-shadow: 0 0 5px var(--accent-a-primary); }
.snake-head-b { background-color: var(--accent-b-primary); color: white; box-shadow: 0 0 5px var(--accent-b-primary); }
.snake-head-text { font-weight: bold; font-size: calc(var(--cell-size) * 0.6); }
.snake-body-a, .snake-body-b {
width: calc(var(--cell-size) * 0.7); height: calc(var(--cell-size) * 0.7);
border-radius: 2px; display: block; opacity: 0.8;
}
.snake-body-a { background-color: var(--accent-a-secondary); }
.snake-body-b { background-color: var(--accent-b-secondary); }
.snake-body-a span, .snake-body-b span { display: none; }
.arrow {
width: 0; height: 0; border-style: solid;
border-width: 0 calc(var(--cell-size) * 0.2) calc(var(--cell-size) * 0.35) calc(var(--cell-size) * 0.2);
border-color: transparent transparent currentColor transparent;
position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
}
.north { transform: translate(-50%, -50%) rotate(0deg); }
.northeast { transform: translate(-50%, -50%) rotate(45deg); }
.east { transform: translate(-50%, -50%) rotate(90deg); }
.southeast { transform: translate(-50%, -50%) rotate(135deg); }
.south { transform: translate(-50%, -50%) rotate(180deg); }
.southwest { transform: translate(-50%, -50%) rotate(225deg); }
.west { transform: translate(-50%, -50%) rotate(270deg); }
.northwest { transform: translate(-50%, -50%) rotate(315deg); }
.tooltip {
position: absolute; bottom: calc(100% + 5px); left: 50%;
transform: translateX(-50%); background-color: #333; color: white;
padding: 6px 10px; border-radius: 4px; font-size: 12px;
font-weight: normal; white-space: nowrap; z-index: 10;
pointer-events: none; opacity: 0; transition: opacity 0.2s ease-in-out;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}
.cell:hover .tooltip:not(:empty) { opacity: 1; }
.player-a { color: var(--accent-a-primary); font-weight: bold; }
.player-b { color: var(--accent-b-primary); font-weight: bold; }
#ws-status {
font-size: 0.8em; padding: 2px 6px; border-radius: 4px;
margin-left: 10px; display: inline-block; vertical-align: middle;
}
#ws-status.connected { background-color: #4caf50; color: white; }
#ws-status.disconnected { background-color: #f44336; color: white; }
#ws-status.connecting { background-color: #ff9800; color: white; }
</style>
</head>
<body>
<h1>Snake Game Visualizer - {{ title_suffix }}</h1>
{% if error_message %}
<p style="color: var(--accent-a-primary); text-align: center;">
Error: {{ error_message }}
</p>
{% endif %}
<div id="game-info">
<div id="turn-info">Turn: --</div>
{% if is_live %}
<div id="heuristic-info">Heuristic: <span id="heuristic-value">--</span></div>
<div id="buffer-info">Buffer Size: <span id="buffer-size-value">--</span></div> {# <-- ADDED BUFFER SIZE DISPLAY #}
{% endif %}
<div id="player-info">Current Player: -- {% if is_live %}<span id="ws-status"></span>{% endif %}</div>
</div>
<div id="visualization">
{# Grid cells will be generated by JavaScript #}
</div>
{# Embed initial data for static view #}
<script id="initial-data" type="application/json">
{{ initial_game_state_json | safe if initial_game_state_json else 'null' }}
</script>
<script>
const visualization = document.getElementById("visualization");
const gameInfo = document.getElementById("game-info");
const turnInfoDiv = document.getElementById("turn-info");
const playerInfoDiv = document.getElementById("player-info");
const heuristicInfoDiv = document.getElementById("heuristic-info");
const heuristicValueSpan = document.getElementById("heuristic-value");
const bufferSizeValueSpan = document.getElementById("buffer-size-value"); // <-- Get buffer size span
const initialDataElement = document.getElementById("initial-data");
const wsStatusSpan = document.getElementById("ws-status");
const isLive = {{ is_live | lower }}; // Jinja2 boolean -> JS boolean
const wsUrl = "{{ websocket_url }}"; // Jinja2 variable
const directionClasses = {
North: "north", Northeast: "northeast", East: "east", Southeast: "southeast",
South: "south", Southwest: "southwest", West: "west", Northwest: "northwest",
};
let currentGridSize = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--grid-size'), 10) || 32;
let cellsCache = {}; // Cache cell elements for faster updates
// --- Tooltip Positioning Logic ---
function setupTooltips() {
// Use event delegation on the visualization container
visualization.addEventListener("mouseenter", (event) => {
if (!event.target.classList.contains('cell')) return;
const cell = event.target;
const tooltip = cell.querySelector(".tooltip");
if (!tooltip || !tooltip.textContent) return;
const tooltipRect = tooltip.getBoundingClientRect();
const viewportWidth = window.innerWidth;
const cellRect = cell.getBoundingClientRect(); // Get cell position
// Reset transform first
tooltip.style.transform = `translateX(-50%)`;
// Recalculate rect after reset might be needed if styles change significantly
const currentTooltipRect = tooltip.getBoundingClientRect();
// Check if tooltip goes outside the left edge
if (currentTooltipRect.left < 10) { // Add some padding
const leftOverflow = Math.abs(currentTooltipRect.left);
tooltip.style.transform = `translateX(calc(-50% + ${leftOverflow + 15}px))`;
}
// Check if tooltip goes outside the right edge
else if (currentTooltipRect.right > viewportWidth - 10) { // Add some padding
const rightOverflow = currentTooltipRect.right - viewportWidth;
tooltip.style.transform = `translateX(calc(-50% - ${rightOverflow + 15}px))`;
}
}, true); // Use capture phase
visualization.addEventListener("mouseleave", (event) => {
if (!event.target.classList.contains('cell')) return;
const cell = event.target;
const tooltip = cell.querySelector(".tooltip");
if (tooltip) {
// Optional: Reset transform on mouse leave if needed,
// but might cause flicker if re-entering quickly.
// tooltip.style.transform = `translateX(-50%)`;
}
}, true); // Use capture phase
}
// --- Game Rendering Logic ---
// <-- ADDED bufferSize parameter -->
function renderGame(gameState, heuristic = null, bufferSize = null) {
if (!gameState || !gameState.tiles) {
console.error("Invalid gameState received:", gameState);
visualization.innerHTML = `<p style="color: var(--accent-a-primary); padding: 20px;">Invalid game data received.</p>`;
// Reset info panel if game state is invalid
turnInfoDiv.textContent = `Turn: --`;
playerInfoDiv.innerHTML = `Current Player: -- ${isLive ? wsStatusSpan.outerHTML : ''}`;
if (isLive && heuristicValueSpan) heuristicValueSpan.textContent = '--';
if (isLive && bufferSizeValueSpan) bufferSizeValueSpan.textContent = '--'; // <-- Reset buffer size
return;
}
const {
tiles, trap_mask, portals, snake_a, snake_b,
turn_count, is_player_a, apple_timeline
} = gameState;
// -- Update Grid Size CSS Variable if necessary --
const newGridSize = tiles && tiles.length > 0 ? tiles.length : 32;
if (newGridSize !== currentGridSize) {
console.log(`Grid size changed from ${currentGridSize} to ${newGridSize}`);
currentGridSize = newGridSize;
document.documentElement.style.setProperty("--grid-size", currentGridSize);
// Adjust visualization container size (optional, grid handles layout)
const containerSize = `calc(${currentGridSize} * var(--cell-size) + (${currentGridSize} - 1) * 0px + 2px)`;
visualization.style.width = containerSize;
visualization.style.height = containerSize;
visualization.innerHTML = ''; // Clear grid if size changes
cellsCache = {}; // Clear cache
}
// Update game info
const currentPlayer = is_player_a ? "Player A" : "Player B";
const playerClass = is_player_a ? "player-a" : "player-b";
turnInfoDiv.textContent = `Turn: ${turn_count}`;
playerInfoDiv.innerHTML = `Current Player: <span class="${playerClass}">${currentPlayer}</span> ${isLive ? wsStatusSpan.outerHTML : ''}`; // Keep WS status if live
// Update Heuristic (only if live and element exists)
if (isLive && heuristic !== null && heuristicValueSpan) {
heuristicValueSpan.textContent = heuristic.toFixed(4);
let heuristicColor = 'var(--text-muted-color)';
if (heuristic > 0) heuristicColor = 'var(--accent-a-primary)';
else if (heuristic < 0) heuristicColor = 'var(--accent-b-primary)';
heuristicValueSpan.style.color = heuristicColor;
} else if (heuristicInfoDiv) {
heuristicInfoDiv.style.display = 'none'; // Hide if not live
}
// <-- UPDATE BUFFER SIZE (only if live and element exists) -->
if (isLive && bufferSize !== null && bufferSize !== undefined && bufferSizeValueSpan) {
bufferSizeValueSpan.textContent = bufferSize;
} else if (isLive && bufferSizeValueSpan) {
bufferSizeValueSpan.textContent = '--'; // Show default if value missing
}
// Ensure the parent div is visible only in live mode (handled by Jinja)
const bufferInfoDiv = document.getElementById("buffer-info");
if (bufferInfoDiv) {
bufferInfoDiv.style.display = isLive ? 'block' : 'none'; // Redundant due to Jinja but safe
}
// Convert snake segments (handle potential array format)
const snakeASegments = (snake_a?.segment_queue || []).map(seg => Array.isArray(seg) ? { x: seg[0], y: seg[1] } : seg);
const snakeBSegments = (snake_b?.segment_queue || []).map(seg => Array.isArray(seg) ? { x: seg[0], y: seg[1] } : seg);
// Create map of apple spawns
const appleSpawns = {};
(apple_timeline || []).forEach(([turn, point]) => {
const key = `${point.x},${point.y}`;
if (!appleSpawns[key] || turn < appleSpawns[key].turn) {
appleSpawns[key] = { turn, point };
}
});
// Create map of portal pairs
const portalPairs = {};
if (portals) {
for (let y = 0; y < currentGridSize; y++) {
if (!portals[y]) continue;
for (let x = 0; x < currentGridSize; x++) {
if (portals[y][x] !== null && portals[y][x] !== undefined) {
const dest = portals[y][x];
portalPairs[`${x},${y}`] = dest;
}
}
}
}
// --- Efficient Grid Update ---
const fragment = document.createDocumentFragment();
const cellsToUpdate = new Set(); // Track cells needing DOM update
for (let y = 0; y < currentGridSize; y++) {
if (!tiles[y]) continue;
for (let x = 0; x < currentGridSize; x++) {
if (tiles[y][x] === undefined) continue;
const cellKey = `${x},${y}`;
let cell = cellsCache[cellKey];
let tooltip;
// Create cell if it doesn't exist (initial render or grid resize)
if (!cell) {
cell = document.createElement("div");
cell.className = "cell";
cell.dataset.x = x;
cell.dataset.y = y;
tooltip = document.createElement("div");
tooltip.className = "tooltip";
cell.appendChild(tooltip);
cellsCache[cellKey] = cell;
fragment.appendChild(cell); // Add to fragment for bulk append later
} else {
tooltip = cell.querySelector(".tooltip");
// Reset cell content for update
cell.className = 'cell'; // Base class
while (cell.firstChild && cell.firstChild !== tooltip) {
cell.removeChild(cell.firstChild); // Remove old content except tooltip
}
tooltip.textContent = ''; // Clear tooltip
cellsToUpdate.add(cellKey); // Mark for potential update
}
let currentTooltipText = "";
// --- Determine Cell Content ---
let cellContentElement = null; // e.g., apple div, trap span, snake div
let cellClass = ''; // e.g., 'wall', 'portal'
// Check for portal first
const portalDest = portalPairs[cellKey];
if (portalDest) {
cellClass = 'portal';
currentTooltipText = `Portal to (${portalDest.x}, ${portalDest.y})`;
// Portal hover handled by event delegation now
}
// Add tile content
switch (tiles[y][x]) {
case "Wall":
cellClass = 'wall';
currentTooltipText = appendTooltip(currentTooltipText, "Wall");
break;
case "Apple":
cellContentElement = document.createElement("div");
cellContentElement.className = "apple";
currentTooltipText = appendTooltip(currentTooltipText, "Apple");
break;
default: // Empty or other tile type
// Check for future apple spawns
const appleKey = `${x},${y}`;
if (appleSpawns[appleKey] && appleSpawns[appleKey].turn > turn_count) {
currentTooltipText = appendTooltip(currentTooltipText, `Apple spawns on turn ${appleSpawns[appleKey].turn}`);
}
}
// Add traps (check trap_mask dimensions)
if (trap_mask && trap_mask[y] && trap_mask[y][x] !== undefined && trap_mask[y][x] !== 0) {
const trapValue = trap_mask[y][x];
if (Math.abs(trapValue) > turn_count) {
const trap = document.createElement("span");
trap.className = trapValue > 0 ? "trap-a" : "trap-b";
trap.textContent = "x";
// If other content exists, add trap next to it (might need adjustment)
cellContentElement = trap; // Replace or add logic to combine if needed
const turnsLeft = Math.abs(trapValue) - turn_count;
const player = trapValue > 0 ? "A" : "B";
currentTooltipText = appendTooltip(currentTooltipText, `Trap (${player}) expires in ${turnsLeft} turns`);
}
}
// Check for snake heads
const isSnakeAHead = snakeASegments[0]?.x === x && snakeASegments[0]?.y === y;
const isSnakeBHead = snakeBSegments[0]?.x === x && snakeBSegments[0]?.y === y;
if (isSnakeAHead) {
const head = document.createElement("div");
head.className = "snake-head snake-head-a";
const direction = snake_a?.current_direction;
if (direction && directionClasses[direction]) {
const arrow = document.createElement("div");
arrow.className = `arrow ${directionClasses[direction]}`;
head.appendChild(arrow);
} else {
const text = document.createElement("span");
text.className = "snake-head-text"; text.textContent = "A";
head.appendChild(text);
}
cellContentElement = head; // Head takes precedence
const length = (snake_a?.segment_queue?.length || 0) + (snake_a?.queued_length || 0);
currentTooltipText = appendTooltip(currentTooltipText, `Player A head (Length: ${length}, Sacrifice: ${snake_a?.sacrifice ?? 'N/A'})`);
} else if (isSnakeBHead) {
const head = document.createElement("div");
head.className = "snake-head snake-head-b";
const direction = snake_b?.current_direction;
if (direction && directionClasses[direction]) {
const arrow = document.createElement("div");
arrow.className = `arrow ${directionClasses[direction]}`;
head.appendChild(arrow);
} else {
const text = document.createElement("span");
text.className = "snake-head-text"; text.textContent = "B";
head.appendChild(text);
}
cellContentElement = head; // Head takes precedence
const length = (snake_b?.segment_queue?.length || 0) + (snake_b?.queued_length || 0);
currentTooltipText = appendTooltip(currentTooltipText, `Player B head (Length: ${length}, Sacrifice: ${snake_b?.sacrifice ?? 'N/A'})`);
} else {
// Check for snake body parts (only if not a head)
const isSnakeABody = snakeASegments.some((p, i) => i > 0 && p.x === x && p.y === y);
const isSnakeBBody = snakeBSegments.some((p, i) => i > 0 && p.x === x && p.y === y);
if (isSnakeABody) {
const body = document.createElement("span");
body.className = "snake-body-a";
cellContentElement = body;
currentTooltipText = appendTooltip(currentTooltipText, "Player A body");
} else if (isSnakeBBody) {
const body = document.createElement("span");
body.className = "snake-body-b";
cellContentElement = body;
currentTooltipText = appendTooltip(currentTooltipText, "Player B body");
}
}
// --- Apply Updates to Cell ---
if (cellClass) {
cell.classList.add(cellClass);
}
if (cellContentElement) {
// Insert content before the tooltip
cell.insertBefore(cellContentElement, tooltip);
}
tooltip.textContent = currentTooltipText;
} // end x loop
} // end y loop
// Append newly created cells (if any)
if (fragment.childNodes.length > 0) {
visualization.appendChild(fragment);
}
// Setup tooltips (only needs to be done once after initial full render)
if (visualization.children.length === currentGridSize * currentGridSize && !visualization.dataset.tooltipsSetup) {
setupTooltips();
visualization.dataset.tooltipsSetup = "true"; // Mark as setup
}
}
function appendTooltip(existingText, newText) {
if (!newText) return existingText;
return existingText ? `${existingText} | ${newText}` : newText;
}
// --- WebSocket Logic ---
let socket = null;
let reconnectAttempts = 0;
const maxReconnectAttempts = 10;
const reconnectInterval = 3000; // 3 seconds
function connectWebSocket() {
if (!isLive || !wsUrl) return;
if (socket && (socket.readyState === WebSocket.OPEN || socket.readyState === WebSocket.CONNECTING)) {
console.log("WebSocket already open or connecting.");
return;
}
console.log(`Attempting to connect WebSocket (${reconnectAttempts + 1}/${maxReconnectAttempts})...`);
updateWsStatus("connecting", "Connecting...");
socket = new WebSocket(wsUrl);
socket.onopen = (event) => {
console.log("WebSocket connection established.");
updateWsStatus("connected", "Live");
reconnectAttempts = 0; // Reset attempts on successful connection
};
socket.onmessage = (event) => {
// console.log("WebSocket message received:", event.data);
try {
const data = JSON.parse(event.data);
// <-- Pass buffer_size to renderGame -->
if (data.board) {
renderGame(data.board, data.heuristic, data.buffer_size);
} else {
console.warn("Received WebSocket message without 'board' data:", data);
// Optionally render with null board to clear/show error state
renderGame(null, data.heuristic, data.buffer_size);
}
} catch (error) {
console.error("Error parsing WebSocket message:", error);
renderGame(null); // Render empty/error state
}
};
socket.onerror = (event) => {
console.error("WebSocket error:", event);
// The 'onclose' event will usually follow an error.
};
socket.onclose = (event) => {
console.log(`WebSocket connection closed. Code: ${event.code}, Reason: ${event.reason || 'N/A'}`);
updateWsStatus("disconnected", "Offline");
socket = null; // Ensure socket is nullified
if (reconnectAttempts < maxReconnectAttempts) {
reconnectAttempts++;
console.log(`Attempting to reconnect in ${reconnectInterval / 1000} seconds...`);
setTimeout(connectWebSocket, reconnectInterval);
} else {
console.error("Max WebSocket reconnect attempts reached.");
updateWsStatus("disconnected", "Failed");
}
};
}
function updateWsStatus(statusClass, statusText) {
// Find the span dynamically each time in case the playerInfoDiv content changes
const currentWsStatusSpan = document.getElementById("ws-status");
if (currentWsStatusSpan) {
currentWsStatusSpan.className = `status-${statusClass}`;
currentWsStatusSpan.textContent = statusText;
} else if (isLive && playerInfoDiv) {
// If span doesn't exist yet, create and append it
// This might happen if playerInfoDiv innerHTML was reset
const newSpan = document.createElement('span');
newSpan.id = 'ws-status';
newSpan.className = `status-${statusClass}`;
newSpan.textContent = statusText;
// Append after the player name span if possible, otherwise just append
const playerSpan = playerInfoDiv.querySelector('.player-a, .player-b');
if (playerSpan && playerSpan.nextSibling) {
playerInfoDiv.insertBefore(newSpan, playerSpan.nextSibling);
} else {
playerInfoDiv.appendChild(newSpan);
}
// Add a space before the status span for better formatting
newSpan.insertAdjacentText('beforebegin', ' ');
}
}
// --- Initial Load ---
document.addEventListener("DOMContentLoaded", () => {
if (isLive) {
// For live view, connect WebSocket. Initial render might be empty or show loading.
renderGame(null); // Render empty grid initially
connectWebSocket();
} else {
// For static view, parse and render the embedded initial data.
try {
const initialJson = initialDataElement.textContent.trim();
if (initialJson && initialJson !== 'null') {
const initialState = JSON.parse(initialJson);
// Static view doesn't have heuristic or buffer size from this source
renderGame(initialState, null, null);
} else {
console.warn("No initial game state data found for static view.");
visualization.innerHTML = `<p style="color: var(--text-muted-color); padding: 20px;">No game data loaded.</p>`;
renderGame(null); // Ensure info panel is also reset
}
} catch (error) {
console.error("Error parsing initial game state JSON:", error);
visualization.innerHTML = `<p style="color: var(--accent-a-primary); padding: 20px;">Error loading initial game data.</p>`;
renderGame(null); // Ensure info panel is also reset
}
}
});
</script>
</body>
</html>
"""
html_template = Template(html_template_str)
# --- WebSocket Management ---
class ConnectionManager:
def __init__(self):
self.active_connections: list[WebSocket] = []
self.latest_data: Optional[Dict] = None # Store latest full data packet
async def connect(self, websocket: WebSocket):
await websocket.accept()
self.active_connections.append(websocket)
logger.info(f"WebSocket connected: {websocket.client}")
# Send the latest data immediately if available
if self.latest_data:
try:
await websocket.send_json(self.latest_data)
except Exception as e:
logger.warning(f"Failed to send initial data to new client: {e}")
def disconnect(self, websocket: WebSocket):
if websocket in self.active_connections:
self.active_connections.remove(websocket)
logger.info(f"WebSocket disconnected: {websocket.client}")
async def broadcast(self, data: dict):
self.latest_data = data # Update latest data
if self.active_connections:
# Use asyncio.gather for concurrent sending
results = await asyncio.gather(
*[
self._send_data(websocket, data)
for websocket in self.active_connections
],
return_exceptions=True, # Don't let one failure stop others
)
for i, result in enumerate(results):
if isinstance(result, Exception):
# Avoid index errors if a connection was removed during broadcast
if i < len(self.active_connections):
ws = self.active_connections[i]
logger.error(f"Failed to send data to {ws.client}: {result}")
# Optionally disconnect problematic clients here
# self.disconnect(ws)
# await ws.close()
else:
logger.error(
f"Failed to send data to a client (already disconnected?): {result}"
)
async def _send_data(self, websocket: WebSocket, data: dict):
"""Helper to send data and handle potential errors."""
try:
await websocket.send_json(data)
except WebSocketDisconnect:
self.disconnect(
websocket
) # Already handled by main loop, but good practice
except Exception as e:
# Raise exception to be caught by asyncio.gather
raise RuntimeError(f"Send error for {websocket.client}") from e
manager = ConnectionManager()
# --- Filesystem Watcher ---
class LiveJsonHandler(FileSystemEventHandler):
def __init__(self, queue: asyncio.Queue):
self.queue = queue
self.last_processed_time: float = 0
self.debounce_delay = 0.1 # 100ms debounce
def on_created(self, event: FileSystemEvent):
self._handle_event(event)
def on_modified(self, event: FileSystemEvent):
# Sometimes files are created then quickly modified
self._handle_event(event)
def _handle_event(self, event: FileSystemEvent):
if not event.is_directory and event.src_path.endswith(".json"):
try:
current_time = time.time()
# Basic debounce: ignore events too close together for the same file
# A more robust approach might track file modification times
if current_time - self.last_processed_time > self.debounce_delay:
logger.debug(f"Detected file event: {event.src_path}")
# Put the file path onto the async queue for processing
self.queue.put_nowait(Path(event.src_path))
self.last_processed_time = current_time
else:
logger.debug(f"Debounced file event: {event.src_path}")
except Exception as e:
logger.error(f"Error handling file event {event.src_path}: {e}")
async def watch_live_dir(queue: asyncio.Queue):
event_handler = LiveJsonHandler(queue)
observer = Observer()
observer.schedule(event_handler, str(LIVE_DIR), recursive=False)
observer.start()
logger.info(f"Started watching directory: {LIVE_DIR}")
try:
while True:
# Keep the watcher alive
await asyncio.sleep(1)
except KeyboardInterrupt:
observer.stop()
logger.info("Stopped watching directory.")
except Exception as e:
logger.error(f"Error in directory watcher: {e}")
observer.stop()
finally:
observer.join()
async def process_live_files(queue: asyncio.Queue):
"""Process files from the queue and broadcast updates."""
last_processed_file: Optional[Path] = None
last_mod_time: float = 0.0
while True:
file_path: Optional[Path] = None # Initialize file_path
try:
file_path = await queue.get()
logger.info(f"Processing file: {file_path}")
# Check modification time to handle potential rapid updates/duplicates
try:
current_mod_time = file_path.stat().st_mtime
except FileNotFoundError:
logger.warning(f"File disappeared before processing: {file_path}")
queue.task_done()
continue # Skip this file
# Only process if it's newer than the last processed file
# Or if it's a different file (though filenames are time-based)
# Allow processing if it's the same file but modified later
if file_path == last_processed_file and current_mod_time <= last_mod_time:
logger.debug(
f"Skipping older/same timestamp file: {file_path} ({current_mod_time} <= {last_mod_time})"
)
queue.task_done()
continue
# If it's a different file path, reset last_mod_time check baseline
elif file_path != last_processed_file and current_mod_time <= last_mod_time:
logger.debug(
f"Processing potentially older file (new path): {file_path} ({current_mod_time} vs last {last_mod_time})"
)
# Allow processing, but don't update last_mod_time yet
async with aiofiles.open(file_path, mode="r") as f:
content = await f.read()
game_data = json.loads(content)
# Validate expected structure (basic check)
# Now check for board, heuristic, AND buffer_size
if (
"board" in game_data
and "heuristic" in game_data
and "buffer_size" in game_data
):
await manager.broadcast(game_data)
logger.debug(f"Broadcasted update from: {file_path.name}")
last_processed_file = file_path
last_mod_time = (
current_mod_time # Update time only on successful broadcast
)
else:
missing_keys = [
k
for k in ["board", "heuristic", "buffer_size"]
if k not in game_data
]
logger.warning(
f"Invalid JSON structure in {file_path.name}: Missing keys: {', '.join(missing_keys)}"
)
except json.JSONDecodeError:
if file_path:
logger.error(f"Error decoding JSON from {file_path.name}")
except FileNotFoundError:
# Can happen if file is deleted between detection and processing
if file_path:
logger.warning(f"File not found during processing: {file_path.name}")
except Exception as e:
logger.error(
f"Error processing file {file_path.name if file_path else 'unknown'}: {e}",
exc_info=True, # Log traceback for unexpected errors
)
finally:
# Important: Mark task as done in the queue
queue.task_done()
# --- FastAPI Routes ---
@app.get("/", response_class=HTMLResponse)
async def get_root():
# Redirect root to /live for convenience
return HTMLResponse(
content='<html><head><meta http-equiv="refresh" content="0; url=/live"></head><body>Redirecting to <a href="/live">/live</a>...</body></html>'
)
@app.get("/live", response_class=HTMLResponse)
async def get_live_visualizer(request: Request):
"""Serves the visualizer page configured for live WebSocket updates."""
ws_scheme = "wss" if request.url.scheme == "https" else "ws"
ws_url = f"{ws_scheme}://{request.url.hostname}:{request.url.port}/ws/live"
content = html_template.render(
title_suffix="Live",
is_live=True,
websocket_url=ws_url,
initial_game_state_json="null", # No initial state for live view
error_message=None,
)
return HTMLResponse(content=content)
@app.get("/{game_id_str}", response_class=HTMLResponse)
async def get_static_visualizer(request: Request, game_id_str: str):
"""Serves the visualizer page with data loaded from a static JSON file."""
if not game_id_str.isdigit():
# Avoid trying to load files like 'favicon.ico'
raise HTTPException(status_code=404, detail="Game ID must be a number.")
game_id = int(game_id_str)
file_path = STATIC_GAME_DIR / f"{game_id}.json"
error_msg = None
game_state_json = "null"
if not file_path.is_file():
logger.warning(f"Static game file not found: {file_path}")
error_msg = f"Game file '{game_id}.json' not found in {STATIC_GAME_DIR}."
# Render the page anyway but show the error
# raise HTTPException(status_code=404, detail=f"Game file not found: {file_path.name}")
else:
try:
async with aiofiles.open(file_path, mode="r") as f:
content = await f.read()
# Validate JSON structure before passing
data = json.loads(content)
if isinstance(data, dict): # Basic check if it's an object
game_state_json = json.dumps(data) # Pass the full JSON
else:
error_msg = f"Invalid JSON structure in '{file_path.name}'. Expected a JSON object."
logger.error(error_msg)
except json.JSONDecodeError:
error_msg = f"Error decoding JSON from '{file_path.name}'."
logger.error(error_msg, exc_info=True)
except Exception as e:
error_msg = f"Error reading game file '{file_path.name}': {e}"
logger.error(error_msg, exc_info=True)
content = html_template.render(
title_suffix=f"Game {game_id}",
is_live=False,
websocket_url="", # No WS for static view
initial_game_state_json=game_state_json,
error_message=error_msg,
)
return HTMLResponse(content=content)
@app.websocket("/ws/live")
async def websocket_endpoint(websocket: WebSocket):
"""Handles WebSocket connections for live updates."""
await manager.connect(websocket)
try:
while True:
# Keep connection alive by waiting for a message (or timeout)
# This also implicitly handles client-side disconnects better
# than just sleeping. Set a long timeout if no messages expected.
# If the client sends pings, this will receive them.
await websocket.receive_text() # Wait for messages (or disconnect)
# If you expect pings, you might check the received text:
# text = await websocket.receive_text()
# if text != "ping": process other messages if needed
except WebSocketDisconnect:
logger.info(f"WebSocket {websocket.client} disconnected (expected).")
manager.disconnect(websocket)
except Exception as e: