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| 1 // Copyright (c) 2011 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/base/single_request_host_resolver.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/bind_helpers.h" | |
| 9 #include "base/compiler_specific.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "net/base/net_errors.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 SingleRequestHostResolver::SingleRequestHostResolver(HostResolver* resolver) | |
| 16 : resolver_(resolver), | |
| 17 cur_request_(NULL), | |
| 18 ALLOW_THIS_IN_INITIALIZER_LIST(callback_( | |
| 19 base::Bind(&SingleRequestHostResolver::OnResolveCompletion, | |
| 20 base::Unretained(this)))) { | |
| 21 DCHECK(resolver_ != NULL); | |
| 22 } | |
| 23 | |
| 24 SingleRequestHostResolver::~SingleRequestHostResolver() { | |
| 25 Cancel(); | |
| 26 } | |
| 27 | |
| 28 int SingleRequestHostResolver::Resolve( | |
| 29 const HostResolver::RequestInfo& info, AddressList* addresses, | |
| 30 const CompletionCallback& callback, const BoundNetLog& net_log) { | |
| 31 DCHECK(addresses); | |
| 32 DCHECK_EQ(false, callback.is_null()); | |
| 33 DCHECK(cur_request_callback_.is_null()) << "resolver already in use"; | |
| 34 | |
| 35 HostResolver::RequestHandle request = NULL; | |
| 36 | |
| 37 // We need to be notified of completion before |callback| is called, so that | |
| 38 // we can clear out |cur_request_*|. | |
| 39 CompletionCallback transient_callback = | |
| 40 callback.is_null() ? CompletionCallback() : callback_; | |
| 41 | |
| 42 int rv = resolver_->Resolve( | |
| 43 info, addresses, transient_callback, &request, net_log); | |
| 44 | |
| 45 if (rv == ERR_IO_PENDING) { | |
| 46 DCHECK_EQ(false, callback.is_null()); | |
| 47 // Cleared in OnResolveCompletion(). | |
| 48 cur_request_ = request; | |
| 49 cur_request_callback_ = callback; | |
| 50 } | |
| 51 | |
| 52 return rv; | |
| 53 } | |
| 54 | |
| 55 void SingleRequestHostResolver::Cancel() { | |
| 56 if (!cur_request_callback_.is_null()) { | |
| 57 resolver_->CancelRequest(cur_request_); | |
| 58 cur_request_ = NULL; | |
| 59 cur_request_callback_.Reset(); | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 void SingleRequestHostResolver::OnResolveCompletion(int result) { | |
| 64 DCHECK(cur_request_); | |
| 65 DCHECK_EQ(false, cur_request_callback_.is_null()); | |
| 66 | |
| 67 CompletionCallback callback = cur_request_callback_; | |
| 68 | |
| 69 // Clear the outstanding request information. | |
| 70 cur_request_ = NULL; | |
| 71 cur_request_callback_.Reset(); | |
| 72 | |
| 73 // Call the user's original callback. | |
| 74 callback.Run(result); | |
| 75 } | |
| 76 | |
| 77 } // namespace net | |
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Chromium Code Reviews
Issue 12518036:
net: move host_resolver files from net/base to net/dns (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src