add an interface to monitor the states of the polling connections
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2bfcc822a3
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3f173d70a2
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@ -16,8 +16,12 @@ const meta = {
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listeners: {},
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nextId: 1,
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currentRequest: null,
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connectionState: 'initializing',
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};
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const stateListeners = {};
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const stateNextId = 1;
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/* One-time request, no caching or polling */
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function getGameState(gameId, retries) {
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if (arguments.length < 2) {
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@ -161,6 +165,70 @@ function sendUpdate(gameId, data, retries) {
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});
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}
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function onConnectionStateChanged(gameId, callback) {
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if (arguments.length < 2) {
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callback = gameId;
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gameId = undefined;
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}
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if (gameId !== undefined) {
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const original = callback;
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callback = function(cbGameId, cbState) {
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if (cbGameId === gameId) {
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original(cbState);
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}
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};
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}
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const cbId = stateNextId;
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stateNextId += 1;
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stateListeners[cbId] = callback;
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return function clearConnectionStateChanged() {
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delete stateListeners[cbId];
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};
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}
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function getConnectionState(gameId) {
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if (arguments.length < 1) {
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return meta.connectionState;
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} else {
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return games[gameId] && games[gameId].connectionState;
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}
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}
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function setConnectionState(game, state) {
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let gameId;
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if (arguments.length < 2) {
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gameId = 'meta';
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state = game;
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game = meta;
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} else if (typeof game === 'string') {
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gameId = game;
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game = gamePollState(game);
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} else {
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gameId = game.gameId;
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}
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if (state !== game.connectionState) {
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if (state !== 'initializing' && state !== 'connecting' && state !== 'polling'
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&& state !== 'failed' && state !== 'stopped') {
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throw new TypeError(`invalid connection state: ${state}`);
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}
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game.connectionState = state;
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for (const cbId in stateListeners) {
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try {
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stateListeners[cbId](gameId, state);
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} catch(err) {
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console.error('uncaught exception in callback', err);
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}
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}
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}
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}
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function gamePollState(gameId) {
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if (gameId in games === false) {
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games[gameId] = {
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@ -168,6 +236,7 @@ function gamePollState(gameId) {
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data: { gameId, modified: 0 },
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listeners: [],
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nextId: 1,
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connectionState: 'initializing',
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};
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}
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@ -177,15 +246,21 @@ function gamePollState(gameId) {
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function processGame(gameId, data) {
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const game = gamePollState(gameId);
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if (data && data.modified > game.data.modified) {
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if (data && (game.data.modified === 0 || data.modified > game.data.modified)) {
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data.gameId = data.gameId || gameId;
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game.data = data;
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for (const cbId in game.listeners) {
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try {
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game.listeners[cbId](data, gameId);
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game.listeners[cbId](JSON.parse(JSON.stringify(data)), gameId);
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} catch(err) {
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console.error('uncaught exception in callback', err);
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}
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}
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if (data.modified !== 0) {
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processMeta({ games: [data], modified: 0 });
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}
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}
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}
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@ -197,24 +272,31 @@ function startGamePoll(gameId, afterTime) {
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afterTime = game.data.modified;
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}
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if (game.connectionState !== 'polling') {
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if (game.connectionState !== 'failed') {
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setConnectionState(game, 'connecting');
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}
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}
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const thisRequest = game.currentRequest = $.ajax({
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dataType: 'json',
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contentType: 'application/json',
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url: `${API_BASE}/game/${gameId}/poll/${afterTime}`,
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url: `${API_BASE}/game/${gameId}${!afterTime ? '' : `/poll/${afterTime}`}`,
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cache: false,
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timeout: LONG_TIMEOUT,
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timeout: afterTime ? LONG_TIMEOUT : SHORT_TIMEOUT,
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}).done((data, textStatus, jqXHR) => {
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if (game.currentRequest === thisRequest) {
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game.currentRequest = null;
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if (jqXHR.status == 204) {
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startGamePoll(gameId, afterTime);
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} else {
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if (jqXHR.status !== 204) {
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afterTime = data.modified;
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processGame(gameId, data);
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startGamePoll(gameId, data.modified);
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}
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setConnectionState(game, 'polling');
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startGamePoll(gameId, afterTime);
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}
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}).fail((jqXHR, textStatus, errorThrown) => {
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if (game.currentRequest === thisRequest) {
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setConnectionState(game, 'failed');
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setTimeout(() => {
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if (game.currentRequest === thisRequest) {
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game.currentRequest = null;
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@ -235,19 +317,28 @@ function stopGamePoll(gameId) {
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const request = game.currentRequest;
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if (request !== null) {
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game.currentRequest = null;
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setConnectionState(game, 'stopped');
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request.abort();
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}
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}
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function processMeta(data) {
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meta.lastModified = data.modified;
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if (data.modified > meta.lastModified) {
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meta.lastModified = data.modified;
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}
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for (const game of data.games) {
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if (game.gameId in meta.games === false || game.modified > meta.games[game.gameId].modified) {
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meta.games[game.gameId] = game;
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const gameId = game.gameId;
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if (gameId in meta.games === false || game.modified > meta.games[gameId].modified) {
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meta.games[gameId] = game;
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if (gameId in games === false || games[gameId].data.modified === 0) {
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const copy = Object.assign({}, game);
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copy.modified = 0;
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processGame(gameId, copy);
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}
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for (const cbId in meta.listeners) {
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try {
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meta.listeners[cbId](game, game.gameId);
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meta.listeners[cbId](JSON.parse(JSON.stringify(game)), gameId);
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} catch(err) {
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console.error('uncaught exception in callback', err);
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}
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@ -262,24 +353,31 @@ function startMetaPoll(afterTime) {
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afterTime = meta.lastModified;
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}
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if (meta.connectionState !== 'polling') {
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if (meta.connectionState !== 'failed') {
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setConnectionState('connecting');
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}
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}
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const thisRequest = meta.currentRequest = $.ajax({
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dataType: 'json',
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contentType: 'application/json',
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url: `https://jessemcdonald.info/pacosako/api/games/poll/${afterTime}`,
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url: `${API_BASE}/games${!afterTime ? '' : `/poll/${afterTime}`}`,
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cache: false,
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timeout: LONG_TIMEOUT,
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timeout: afterTime ? LONG_TIMEOUT : SHORT_TIMEOUT,
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}).done((data, textStatus, jqXHR) => {
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if (meta.currentRequest === thisRequest) {
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meta.currentRequest = null;
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if (jqXHR.status == 204) {
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startMetaPoll(afterTime);
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} else {
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if (jqXHR.status !== 204) {
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afterTime = data.modified;
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processMeta(data);
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startMetaPoll(data.modified);
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}
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setConnectionState('polling');
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startMetaPoll(afterTime);
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}
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}).fail((jqXHR, textStatus, errorThrown) => {
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if (meta.currentRequest === thisRequest) {
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setConnectionState('failed');
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setTimeout(() => {
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if (meta.currentRequest === thisRequest) {
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meta.currentRequest = null;
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@ -295,6 +393,7 @@ function stopMetaPoll() {
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const request = meta.currentRequest;
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if (request !== null) {
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meta.currentRequest = null;
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setConnectionState('stopped');
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request.abort();
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}
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}
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@ -305,6 +404,8 @@ module.exports = {
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onGameUpdate,
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onMetaUpdate,
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sendUpdate,
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getConnectionState,
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onConnectionStateChanged,
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};
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/* vim:set expandtab sw=3 ts=8: */
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