@tableau/taco-toolkit
Version:
Tableau Connector Toolkit
169 lines • 12.7 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
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if (y = 0, t) op = [op[0] & 2, t.value];
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case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
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}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ExtractHandler = void 0;
var extract_1 = require("./extract");
var terminate_extractor_1 = require("./terminate-extractor");
var app_global_1 = __importDefault(require("../../core/app-global"));
/**
* A class to handle extractors creation and deletion requests on the EPS API layer.
* It dedups the extractor creation and deletion requests for the same connection-id.
*
* It is based on the fact that extactor creation and deletion are always paired in a
* extractor lifecycle. On the monolith side, a protocol sends a creation request
* during the init, while it sends a delete request when the protocol is destroyed.
*
* Currently, 1 connection-id can have only 1 paired extractor, so when a connection-id
* is trying to send extractor creation request multi times (triggered by multiple protocol),
* we want them to share the single extractor instance.
*/
var ExtractHandler = /** @class */ (function () {
function ExtractHandler() {
this.connectionStates = new Map();
this.requestCounts = new Map();
}
ExtractHandler.prototype.handleExtractRequest = function (extractorLaunchedEvent, extractHandlerRequest) {
return __awaiter(this, void 0, void 0, function () {
var connectionId, connectionState, promise, response, e_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
connectionId = extractHandlerRequest.connectionId;
connectionState = this.connectionStates.get(connectionId);
this.addRequestCount(connectionId);
if (isConnectedState(connectionState)) {
// check connection resource manager to confirm if there's a live extractor for the connection
if (app_global_1.default.connectionManager.hasActiveConnection(connectionId)) {
return [2 /*return*/, connectionState.response];
}
// if no active connection, the cached the result is stale. Remove and continue.
this.removeConnection(connectionId);
}
else if (isConnectingState(connectionState)) {
return [2 /*return*/, connectionState.promise];
}
promise = (0, extract_1.handleExtract)(extractorLaunchedEvent, extractHandlerRequest);
this.connectionStates.set(connectionId, {
status: 'connecting',
promise: promise,
});
_a.label = 1;
case 1:
_a.trys.push([1, 3, , 4]);
return [4 /*yield*/, promise];
case 2:
response = _a.sent();
return [3 /*break*/, 4];
case 3:
e_1 = _a.sent();
// when error, clean up the cached state, and re-throw to let the caller handle
this.removeConnection(connectionId);
throw e_1;
case 4:
this.connectionStates.set(connectionId, {
status: 'connected',
response: response,
});
return [2 /*return*/, response];
}
});
});
};
ExtractHandler.prototype.handleTerminationRequest = function (terminationRequest) {
var connectionId = terminationRequest.connectionId;
this.reduceRequestCount(connectionId);
if (this.isDeletableConnection(connectionId)) {
var response = (0, terminate_extractor_1.handleTerminateExractor)(terminationRequest);
// after termination if there is no active connection anymore，
// clean up the cached state from extractHandler
if (!app_global_1.default.connectionManager.hasActiveConnection(connectionId)) {
this.removeConnection(connectionId);
}
return response;
}
return {
freedExtractorIds: [],
};
};
ExtractHandler.prototype.getConnectionCount = function () {
return Object.keys(this.connectionStates).length;
};
ExtractHandler.prototype.removeConnection = function (connectionId) {
if (this.connectionStates.has(connectionId)) {
this.connectionStates.delete(connectionId);
}
};
ExtractHandler.prototype.addRequestCount = function (connectionId) {
var count = this.requestCounts.get(connectionId);
if (count === undefined) {
this.requestCounts.set(connectionId, 1);
}
else {
this.requestCounts.set(connectionId, count + 1);
}
};
ExtractHandler.prototype.reduceRequestCount = function (connectionId) {
var count = this.requestCounts.get(connectionId);
if (count === undefined) {
return;
}
var newValue = count - 1;
if (newValue <= 0) {
this.requestCounts.delete(connectionId);
}
else {
this.requestCounts.set(connectionId, newValue);
}
};
ExtractHandler.prototype.isDeletableConnection = function (connectionId) {
var count = this.requestCounts.get(connectionId);
return count === undefined || count < 1;
};
return ExtractHandler;
}());
exports.ExtractHandler = ExtractHandler;
function isConnectedState(state) {
return state !== undefined && state.status === 'connected';
}
function isConnectingState(state) {
return state !== undefined && state.status === 'connecting';
}
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