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      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
    125