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   ~HangingHostResolver() override { EXPECT_TRUE(!has_outstanding_request()); }
  26
  27   bool has_outstanding_request() const {
  28     return outstanding_request_ != NULL;
  29   }
  30
  31   int Resolve(const RequestInfo& info,
  32               RequestPriority priority,
  33               AddressList* addresses,
  34               const CompletionCallback& callback,
  35               RequestHandle* out_req,
  36               const BoundNetLog& net_log) override {
  37     EXPECT_FALSE(has_outstanding_request());
  38     outstanding_request_ = reinterpret_cast<RequestHandle>(0x1234);
  39     *out_req = outstanding_request_;
  40
  41     // Never complete this request! Caller is expected to cancel it
  42     // before destroying the resolver.
  43     return ERR_IO_PENDING;
  44   }
  45
  46   int ResolveFromCache(const RequestInfo& info,
  47                        AddressList* addresses,
  48                        const BoundNetLog& net_log) override {
  49     NOTIMPLEMENTED();
  50     return ERR_UNEXPECTED;
  51   }
  52
  53   void CancelRequest(RequestHandle req) override {
  54     EXPECT_TRUE(has_outstanding_request());
  55     EXPECT_EQ(req, outstanding_request_);
  56     outstanding_request_ = NULL;
  57   }
  58
  59  private:
  60   RequestHandle outstanding_request_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(HangingHostResolver);
  63 };
  64
  65 // Test that a regular end-to-end lookup returns the expected result.
  66 TEST(SingleRequestHostResolverTest, NormalResolve) {
  67   // Create a host resolver dependency that returns address "199.188.1.166"
  68   // for resolutions of "watsup".
  69   MockHostResolver resolver;
  70   resolver.rules()->AddIPLiteralRule("watsup", "199.188.1.166", std::string());
  71
  72   SingleRequestHostResolver single_request_resolver(&resolver);
  73
  74   // Resolve "watsup:90" using our SingleRequestHostResolver.
  75   AddressList addrlist;
  76   TestCompletionCallback callback;
  77   HostResolver::RequestInfo request(HostPortPair("watsup", 90));
  78   int rv = single_request_resolver.Resolve(
  79       request, DEFAULT_PRIORITY, &addrlist, callback.callback(), BoundNetLog());
  80   EXPECT_EQ(ERR_IO_PENDING, rv);
  81   EXPECT_EQ(OK, callback.WaitForResult());
  82
  83   // Verify that the result is what we specified in the MockHostResolver.
  84   ASSERT_FALSE(addrlist.empty());
  85   EXPECT_EQ("199.188.1.166", addrlist.front().ToStringWithoutPort());
  86 }
  87
  88 // Test that the Cancel() method cancels any outstanding request.
  89 TEST(SingleRequestHostResolverTest, Cancel) {
  90   HangingHostResolver resolver;
  91
  92   {
  93     SingleRequestHostResolver single_request_resolver(&resolver);
  94
  95     // Resolve "watsup:90" using our SingleRequestHostResolver.
  96     AddressList addrlist;
  97     TestCompletionCallback callback;
  98     HostResolver::RequestInfo request(HostPortPair("watsup", 90));
  99     int rv = single_request_resolver.Resolve(request,
 100                                              DEFAULT_PRIORITY,
 101                                              &addrlist,
 102                                              callback.callback(),
 103                                              BoundNetLog());
 104     EXPECT_EQ(ERR_IO_PENDING, rv);
 105     EXPECT_TRUE(resolver.has_outstanding_request());
 106   }
 107
 108   // Now that the SingleRequestHostResolver has been destroyed, the
 109   // in-progress request should have been aborted.
 110   EXPECT_FALSE(resolver.has_outstanding_request());
 111 }
 112
 113 // Test that the Cancel() method is a no-op when there is no outstanding
 114 // request.
 115 TEST(SingleRequestHostResolverTest, CancelWhileNoPendingRequest) {
 116   HangingHostResolver resolver;
 117   SingleRequestHostResolver single_request_resolver(&resolver);
 118   single_request_resolver.Cancel();
 119
 120   // To pass, HangingHostResolver should not have received a cancellation
 121   // request (since there is nothing to cancel). If it does, it will crash.
 122 }
 123
 124 } // namespace
 125
 126 }  // namespace net