Palak Handa / startUpJalsa-Backend

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node_modules/continuation-local-storage/test/tracer-scenarios.tap.js 9.58 KB
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f7563de62   Palak Handa   first commit 
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  'use strict';
  
  var EventEmitter = require('events').EventEmitter
    , assert       = require('assert')
    , test         = require('tap').test
    , cls          = require('../context.js')
    ;
  
  var nextID = 1;
  function fresh(name) {
    assert.ok(!cls.getNamespace(name), "namespace " + name + " already exists");
    return cls.createNamespace(name);
  }
  
  function destroy(name) {
    return function destroyer(t) {
      cls.destroyNamespace(name);
      assert.ok(!cls.getNamespace(name), "namespace '" + name + "' should no longer exist");
      t.end();
    };
  }
  
  function runInTransaction(name, fn) {
    var namespace = cls.getNamespace(name);
    assert(namespace, "namespaces " + name + " doesn't exist");
  
    var context = namespace.createContext();
    context.transaction = ++nextID;
    process.nextTick(namespace.bind(fn, context));
  }
  
  test("asynchronous state propagation", function (t) {
    t.plan(24);
  
    t.test("a. async transaction with setTimeout", function (t) {
      t.plan(2);
  
      var namespace = fresh('a', this);
  
      function handler() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('a', function () { setTimeout(handler, 100); });
    });
  
    t.test("a. cleanup", destroy('a'));
  
    t.test("b. async transaction with setInterval", function (t) {
      t.plan(4);
  
      var namespace = fresh('b', this)
        , count     = 0
        , handle
        ;
  
      function handler() {
        count += 1;
        if (count > 2) clearInterval(handle);
        t.ok(namespace.get('transaction'), "transaction should be visible");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('b', function () { handle = setInterval(handler, 50); });
    });
  
    t.test("b. cleanup", destroy('b'));
  
    t.test("c. async transaction with process.nextTick", function (t) {
      t.plan(2);
  
      var namespace = fresh('c', this);
  
      function handler() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('c', function () { process.nextTick(handler); });
    });
  
    t.test("c. cleanup", destroy('c'));
  
    t.test("d. async transaction with EventEmitter.emit", function (t) {
      t.plan(2);
  
      var namespace = fresh('d', this)
        , ee        = new EventEmitter()
        ;
  
      function handler() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('d', function () {
        ee.on('transaction', handler);
        ee.emit('transaction');
      });
    });
  
    t.test("d. cleanup", destroy('d'));
  
    t.test("e. two overlapping async transactions with setTimeout", function (t) {
      t.plan(6);
  
      var namespace = fresh('e', this)
        , first
        , second
        ;
  
      function handler(id) {
        t.ok(namespace.get('transaction'), "transaction should be visible");
        t.equal(namespace.get('transaction'), id, "transaction matches");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('e', function () {
        first = namespace.get('transaction');
        setTimeout(handler.bind(null, first), 100);
      });
  
      setTimeout(function () {
        runInTransaction('e', function () {
          second = namespace.get('transaction');
          t.notEqual(first, second, "different transaction IDs");
          setTimeout(handler.bind(null, second), 100);
        });
      }, 25);
    });
  
    t.test("e. cleanup", destroy('e'));
  
    t.test("f. two overlapping async transactions with setInterval", function (t) {
      t.plan(15);
  
      var namespace = fresh('f', this);
  
      function runInterval() {
        var count = 0
          , handle
          , id
          ;
  
        function handler() {
          count += 1;
          if (count > 2) clearInterval(handle);
          t.ok(namespace.get('transaction'), "transaction should be visible");
          t.equal(id, namespace.get('transaction'), "transaction ID should be immutable");
        }
  
        function run() {
          t.ok(namespace.get('transaction'), "transaction should have been created");
          id = namespace.get('transaction');
          handle = setInterval(handler, 50);
        }
  
        runInTransaction('f', run);
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInterval(); runInterval();
    });
  
    t.test("f. cleanup", destroy('f'));
  
    t.test("g. two overlapping async transactions with process.nextTick", function (t) {
      t.plan(6);
  
      var namespace = fresh('g', this)
        , first
        , second
        ;
  
      function handler(id) {
        var transaction = namespace.get('transaction');
        t.ok(transaction, "transaction should be visible");
        t.equal(transaction, id, "transaction matches");
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('g', function () {
        first = namespace.get('transaction');
        process.nextTick(handler.bind(null, first));
      });
  
      process.nextTick(function () {
        runInTransaction('g', function () {
          second = namespace.get('transaction');
          t.notEqual(first, second, "different transaction IDs");
          process.nextTick(handler.bind(null, second));
        });
      });
    });
  
    t.test("g. cleanup", destroy('g'));
  
    t.test("h. two overlapping async runs with EventEmitter.prototype.emit", function (t) {
      t.plan(3);
  
      var namespace = fresh('h', this)
        , ee        = new EventEmitter()
        ;
  
      function handler() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
      }
  
      function lifecycle() {
        ee.once('transaction', process.nextTick.bind(process, handler));
        ee.emit('transaction');
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('h', lifecycle);
      runInTransaction('h', lifecycle);
    });
  
    t.test("h. cleanup", destroy('h'));
  
    t.test("i. async transaction with an async sub-call with setTimeout", function (t) {
      t.plan(5);
  
      var namespace = fresh('i', this);
  
      function inner(callback) {
        setTimeout(function () {
          t.ok(namespace.get('transaction'), "transaction should (yep) still be visible");
          callback();
        }, 50);
      }
  
      function outer() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
        setTimeout(function () {
          t.ok(namespace.get('transaction'), "transaction should still be visible");
          inner(function () {
            t.ok(namespace.get('transaction'), "transaction should even still be visible");
          });
        }, 50);
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('i', setTimeout.bind(null, outer, 50));
    });
  
    t.test("i. cleanup", destroy('i'));
  
    t.test("j. async transaction with an async sub-call with setInterval", function (t) {
      t.plan(5);
  
      var namespace = fresh('j', this)
        , outerHandle
        , innerHandle
        ;
  
      function inner(callback) {
        innerHandle = setInterval(function () {
          clearInterval(innerHandle);
          t.ok(namespace.get('transaction'), "transaction should (yep) still be visible");
          callback();
        }, 50);
      }
  
      function outer() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
        outerHandle = setInterval(function () {
          clearInterval(outerHandle);
          t.ok(namespace.get('transaction'), "transaction should still be visible");
          inner(function () {
            t.ok(namespace.get('transaction'), "transaction should even still be visible");
          });
        }, 50);
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('j', outer);
    });
  
    t.test("j. cleanup", destroy('j'));
  
    t.test("k. async transaction with an async call with process.nextTick", function (t) {
      t.plan(5);
  
      var namespace = fresh('k', this);
  
      function inner(callback) {
        process.nextTick(function () {
          t.ok(namespace.get('transaction'), "transaction should (yep) still be visible");
          callback();
        });
      }
  
      function outer() {
        t.ok(namespace.get('transaction'), "transaction should be visible");
        process.nextTick(function () {
          t.ok(namespace.get('transaction'), "transaction should still be visible");
          inner(function () {
            t.ok(namespace.get('transaction'), "transaction should even still be visible");
          });
        });
      }
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('k', function () { process.nextTick(outer); });
    });
  
    t.test("k. cleanup", destroy('k'));
  
    t.test("l. async transaction with an async call with EventEmitter.emit", function (t) {
      t.plan(4);
  
      var namespace = fresh('l', this)
        , outer     = new EventEmitter()
        , inner     = new EventEmitter()
        ;
  
      inner.on('pong', function (callback) {
        t.ok(namespace.get('transaction'), "transaction should still be visible");
        callback();
      });
  
      function outerCallback() {
        t.ok(namespace.get('transaction'), "transaction should even still be visible");
      }
  
      outer.on('ping', function () {
        t.ok(namespace.get('transaction'), "transaction should be visible");
        inner.emit('pong', outerCallback);
      });
  
      t.notOk(namespace.get('transaction'), "transaction should not yet be visible");
      runInTransaction('l', outer.emit.bind(outer, 'ping'));
    });
  
    t.test("l. cleanup", destroy('l'));
  });