net/dns/single_request_host_resolver_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/dns/single_request_host_resolver.h"
   6
   7 #include "net/base/address_list.h"
   8 #include "net/base/net_errors.h"
   9 #include "net/base/net_log.h"
  10 #include "net/base/test_completion_callback.h"
  11 #include "net/dns/mock_host_resolver.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 namespace net {
  15
  16 namespace {
  17
  18 // Helper class used by SingleRequestHostResolverTest.Cancel test.
  19 // It checks that only one request is outstanding at a time, and that
  20 // it is cancelled before the class is destroyed.
  21 class HangingHostResolver : public HostResolver {
  22  public:
  23   HangingHostResolver() : outstanding_request_(NULL) {}
  24
  25   virtual ~HangingHostResolver() {
  26     EXPECT_TRUE(!has_outstanding_request());
  27   }
  28
  29   bool has_outstanding_request() const {
  30     return outstanding_request_ != NULL;
  31   }
  32
  33   virtual int Resolve(const RequestInfo& info,
  34                       AddressList* addresses,
  35                       const CompletionCallback& callback,
  36                       RequestHandle* out_req,
  37                       const BoundNetLog& net_log) OVERRIDE {
  38     EXPECT_FALSE(has_outstanding_request());
  39     outstanding_request_ = reinterpret_cast<RequestHandle>(0x1234);
  40     *out_req = outstanding_request_;
  41
  42     // Never complete this request! Caller is expected to cancel it
  43     // before destroying the resolver.
  44     return ERR_IO_PENDING;
  45   }
  46
  47   virtual int ResolveFromCache(const RequestInfo& info,
  48                                AddressList* addresses,
  49                                const BoundNetLog& net_log) OVERRIDE {
  50     NOTIMPLEMENTED();
  51     return ERR_UNEXPECTED;
  52   }
  53
  54   virtual void CancelRequest(RequestHandle req) OVERRIDE {
  55     EXPECT_TRUE(has_outstanding_request());
  56     EXPECT_EQ(req, outstanding_request_);
  57     outstanding_request_ = NULL;
  58   }
  59
  60  private:
  61   RequestHandle outstanding_request_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(HangingHostResolver);
  64 };
  65
  66 // Test that a regular end-to-end lookup returns the expected result.
  67 TEST(SingleRequestHostResolverTest, NormalResolve) {
  68   // Create a host resolver dependency that returns address "199.188.1.166"
  69   // for resolutions of "watsup".
  70   MockHostResolver resolver;
  71   resolver.rules()->AddIPLiteralRule("watsup", "199.188.1.166", std::string());
  72
  73   SingleRequestHostResolver single_request_resolver(&resolver);
  74
  75   // Resolve "watsup:90" using our SingleRequestHostResolver.
  76   AddressList addrlist;
  77   TestCompletionCallback callback;
  78   HostResolver::RequestInfo request(HostPortPair("watsup", 90));
  79   int rv = single_request_resolver.Resolve(
  80       request, &addrlist, callback.callback(), BoundNetLog());
  81   EXPECT_EQ(ERR_IO_PENDING, rv);
  82   EXPECT_EQ(OK, callback.WaitForResult());
  83
  84   // Verify that the result is what we specified in the MockHostResolver.
  85   ASSERT_FALSE(addrlist.empty());
  86   EXPECT_EQ("199.188.1.166", addrlist.front().ToStringWithoutPort());
  87 }
  88
  89 // Test that the Cancel() method cancels any outstanding request.
  90 TEST(SingleRequestHostResolverTest, Cancel) {
  91   HangingHostResolver resolver;
  92
  93   {
  94     SingleRequestHostResolver single_request_resolver(&resolver);
  95
  96     // Resolve "watsup:90" using our SingleRequestHostResolver.
  97     AddressList addrlist;
  98     TestCompletionCallback callback;
  99     HostResolver::RequestInfo request(HostPortPair("watsup", 90));
 100     int rv = single_request_resolver.Resolve(
 101         request, &addrlist, callback.callback(), BoundNetLog());
 102     EXPECT_EQ(ERR_IO_PENDING, rv);
 103     EXPECT_TRUE(resolver.has_outstanding_request());
 104   }
 105
 106   // Now that the SingleRequestHostResolver has been destroyed, the
 107   // in-progress request should have been aborted.
 108   EXPECT_FALSE(resolver.has_outstanding_request());
 109 }
 110
 111 // Test that the Cancel() method is a no-op when there is no outstanding
 112 // request.
 113 TEST(SingleRequestHostResolverTest, CancelWhileNoPendingRequest) {
 114   HangingHostResolver resolver;
 115   SingleRequestHostResolver single_request_resolver(&resolver);
 116   single_request_resolver.Cancel();
 117
 118   // To pass, HangingHostResolver should not have received a cancellation
 119   // request (since there is nothing to cancel). If it does, it will crash.
 120 }
 121
 122 } // namespace
 123
 124 }  // namespace net