react-use-websocket
Version:
React Hook for WebSocket communication
184 lines • 9.17 kB
JavaScript
;
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var __importDefault = (this && this.__importDefault) || function (mod) {
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Object.defineProperty(exports, "__esModule", { value: true });
exports.useWebSocket = void 0;
var react_1 = require("react");
var constants_1 = require("./constants");
var create_or_join_1 = require("./create-or-join");
var get_url_1 = require("./get-url");
var proxy_1 = __importDefault(require("./proxy"));
exports.useWebSocket = function (url, options, connect) {
if (options === void 0) { options = constants_1.DEFAULT_OPTIONS; }
if (connect === void 0) { connect = true; }
var _a = react_1.useState(null), lastMessage = _a[0], setLastMessage = _a[1];
var _b = react_1.useState({}), readyState = _b[0], setReadyState = _b[1];
var lastJsonMessage = react_1.useMemo(function () {
if (lastMessage) {
try {
return JSON.parse(lastMessage.data);
}
catch (e) {
return constants_1.UNPARSABLE_JSON_OBJECT;
}
}
return null;
}, [lastMessage]);
var convertedUrl = react_1.useRef(null);
var webSocketRef = react_1.useRef(null);
var startRef = react_1.useRef(function () { return void 0; });
var reconnectCount = react_1.useRef(0);
var messageQueue = react_1.useRef([]);
var webSocketProxy = react_1.useRef(null);
var optionsCache = react_1.useRef(options);
optionsCache.current = options;
var readyStateFromUrl = convertedUrl.current && readyState[convertedUrl.current] !== undefined ?
readyState[convertedUrl.current] :
url !== null && connect === true ?
constants_1.ReadyState.CONNECTING :
constants_1.ReadyState.UNINSTANTIATED;
var stringifiedQueryParams = options.queryParams ? JSON.stringify(options.queryParams) : null;
var sendMessage = react_1.useCallback(function (message) {
if (webSocketRef.current instanceof EventSource) {
console.warn('Unable to send a message from an eventSource');
return;
}
if (webSocketRef.current && webSocketRef.current.readyState === constants_1.ReadyState.OPEN) {
webSocketRef.current.send(message);
}
else {
messageQueue.current.push(message);
}
}, []);
var sendJsonMessage = react_1.useCallback(function (message) {
sendMessage(JSON.stringify(message));
}, [sendMessage]);
var getWebSocket = react_1.useCallback(function () {
if (optionsCache.current.share !== true || webSocketRef.current instanceof EventSource) {
return webSocketRef.current;
}
if (webSocketProxy.current === null && webSocketRef.current) {
webSocketProxy.current = proxy_1.default(webSocketRef.current, startRef);
}
return webSocketProxy.current;
}, []);
react_1.useEffect(function () {
if (url !== null && connect === true) {
var removeListeners_1;
var expectClose_1 = false;
var start_1 = function () { return __awaiter(void 0, void 0, void 0, function () {
var _a, protectedSetLastMessage, protectedSetReadyState;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
_a = convertedUrl;
return [4 /*yield*/, get_url_1.getUrl(url, optionsCache)];
case 1:
_a.current = _b.sent();
protectedSetLastMessage = function (message) {
if (!expectClose_1) {
setLastMessage(message);
}
};
protectedSetReadyState = function (state) {
if (!expectClose_1) {
setReadyState(function (prev) {
var _a;
return (__assign(__assign({}, prev), (convertedUrl.current && (_a = {}, _a[convertedUrl.current] = state, _a))));
});
}
};
removeListeners_1 = create_or_join_1.createOrJoinSocket(webSocketRef, convertedUrl.current, protectedSetReadyState, optionsCache, protectedSetLastMessage, startRef, reconnectCount, sendMessage);
return [2 /*return*/];
}
});
}); };
startRef.current = function () {
if (!expectClose_1) {
if (webSocketProxy.current)
webSocketProxy.current = null;
removeListeners_1 === null || removeListeners_1 === void 0 ? void 0 : removeListeners_1();
start_1();
}
};
start_1();
return function () {
expectClose_1 = true;
if (webSocketProxy.current)
webSocketProxy.current = null;
removeListeners_1 === null || removeListeners_1 === void 0 ? void 0 : removeListeners_1();
setLastMessage(null);
};
}
else if (url === null || connect === false) {
setReadyState(function (prev) {
var _a;
return (__assign(__assign({}, prev), (convertedUrl.current && (_a = {}, _a[convertedUrl.current] = constants_1.ReadyState.CLOSED, _a))));
});
}
}, [url, connect, stringifiedQueryParams, sendMessage]);
react_1.useEffect(function () {
if (readyStateFromUrl === constants_1.ReadyState.OPEN) {
messageQueue.current.splice(0).forEach(function (message) {
sendMessage(message);
});
}
}, [readyStateFromUrl]);
return {
sendMessage: sendMessage,
sendJsonMessage: sendJsonMessage,
lastMessage: lastMessage,
lastJsonMessage: lastJsonMessage,
readyState: readyStateFromUrl,
getWebSocket: getWebSocket,
};
};
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