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Copyright (c) Microsoft Corporation. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use

this file except in compliance with the License. You may obtain a copy of the

License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED

WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,

MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions

and limitations under the License.

***************************************************************************** */

"use strict";

var fs = require("fs");

function pipeExists(name) {

try {

fs.statSync(name);

return true;

}

catch (e) {

return false;

}

}

function createCancellationToken(args) {

var cancellationPipeName;

for (var i = 0; i < args.length - 1; i++) {

if (args[i] === "--cancellationPipeName") {

cancellationPipeName = args[i + 1];

break;

}

}

if (!cancellationPipeName) {

return {

isCancellationRequested: function () { return false; },

setRequest: function (_requestId) { return void 0; },

resetRequest: function (_requestId) { return void 0; }

};

}

if (cancellationPipeName.charAt(cancellationPipeName.length - 1) === "*") {

var namePrefix_1 = cancellationPipeName.slice(0, -1);

if (namePrefix_1.length === 0 || namePrefix_1.indexOf("*") >= 0) {

throw new Error("Invalid name for template cancellation pipe: it should have length greater than 2 characters and contain only one '*'.");

}

var perRequestPipeName_1;

var currentRequestId_1;

return {

isCancellationRequested: function () { return perRequestPipeName_1 !== undefined && pipeExists(perRequestPipeName_1); },

setRequest: function (requestId) {

currentRequestId_1 = requestId;

perRequestPipeName_1 = namePrefix_1 + requestId;

},

resetRequest: function (requestId) {

if (currentRequestId_1 !== requestId) {

throw new Error("Mismatched request id, expected " + currentRequestId_1 + ", actual " + requestId);

}

perRequestPipeName_1 = undefined;

}

};

}

else {

return {

isCancellationRequested: function () { return pipeExists(cancellationPipeName); },

setRequest: function (_requestId) { return void 0; },

resetRequest: function (_requestId) { return void 0; }

};

}

}

module.exports = createCancellationToken;

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