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| 1 // Copyright 2014 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 "components/network_hints/browser/network_hints_message_filter.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 #include "base/macros.h" |
| 9 #include "components/network_hints/common/network_hints_common.h" |
| 10 #include "components/network_hints/common/network_hints_messages.h" |
| 11 #include "ipc/ipc_message_macros.h" |
| 12 #include "net/base/address_list.h" |
| 13 #include "net/base/net_errors.h" |
| 14 #include "net/dns/host_resolver.h" |
| 15 #include "net/dns/single_request_host_resolver.h" |
| 16 #include "url/gurl.h" |
| 17 |
| 18 namespace network_hints { |
| 19 |
| 20 namespace { |
| 21 |
| 22 const int kDefaultPort = 80; |
| 23 |
| 24 class DnsLookupRequest { |
| 25 public: |
| 26 DnsLookupRequest(net::HostResolver* host_resolver, |
| 27 const std::string& hostname) |
| 28 : hostname_(hostname), |
| 29 resolver_(host_resolver) { |
| 30 } |
| 31 |
| 32 // Return underlying network resolver status. |
| 33 // net::OK ==> Host was found synchronously. |
| 34 // net:ERR_IO_PENDING ==> Network will callback later with result. |
| 35 // anything else ==> Host was not found synchronously. |
| 36 int Start() { |
| 37 net::HostResolver::RequestInfo resolve_info( |
| 38 net::HostPortPair(hostname_, kDefaultPort)); |
| 39 |
| 40 // Make a note that this is a speculative resolve request. This allows |
| 41 // separating it from real navigations in the observer's callback, and |
| 42 // lets the HostResolver know it can be de-prioritized. |
| 43 resolve_info.set_is_speculative(true); |
| 44 return resolver_.Resolve( |
| 45 resolve_info, |
| 46 net::DEFAULT_PRIORITY, |
| 47 &addresses_, |
| 48 base::Bind(&DnsLookupRequest::OnLookupFinished, base::Owned(this)), |
| 49 net::BoundNetLog()); |
| 50 } |
| 51 |
| 52 private: |
| 53 void OnLookupFinished(int result) { |
| 54 VLOG(2) << __FUNCTION__ << ": " << hostname_ << ", result=" << result; |
| 55 } |
| 56 |
| 57 const std::string hostname_; |
| 58 net::SingleRequestHostResolver resolver_; |
| 59 net::AddressList addresses_; |
| 60 |
| 61 DISALLOW_COPY_AND_ASSIGN(DnsLookupRequest); |
| 62 }; |
| 63 |
| 64 } // namespace |
| 65 |
| 66 NetworkHintsMessageFilter::NetworkHintsMessageFilter( |
| 67 net::HostResolver* host_resolver) |
| 68 : content::BrowserMessageFilter(NetworkHintsMsgStart), |
| 69 host_resolver_(host_resolver) { |
| 70 DCHECK(host_resolver_); |
| 71 } |
| 72 |
| 73 NetworkHintsMessageFilter::~NetworkHintsMessageFilter() { |
| 74 } |
| 75 |
| 76 bool NetworkHintsMessageFilter::OnMessageReceived(const IPC::Message& message) { |
| 77 bool handled = true; |
| 78 IPC_BEGIN_MESSAGE_MAP(NetworkHintsMessageFilter, message) |
| 79 IPC_MESSAGE_HANDLER(NetworkHintsMsg_DNSPrefetch, OnDnsPrefetch) |
| 80 IPC_MESSAGE_UNHANDLED(handled = false) |
| 81 IPC_END_MESSAGE_MAP() |
| 82 return handled; |
| 83 } |
| 84 |
| 85 void NetworkHintsMessageFilter::OnDnsPrefetch( |
| 86 const LookupRequest& lookup_request) { |
| 87 DCHECK(host_resolver_); |
| 88 for (const std::string& hostname : lookup_request.hostname_list) { |
| 89 DnsLookupRequest* request = new DnsLookupRequest(host_resolver_, hostname); |
| 90 // Note: DnsLookupRequest will be freed by the base::Owned call when |
| 91 // resolving has completed. |
| 92 request->Start(); |
| 93 } |
| 94 } |
| 95 |
| 96 } // namespace network_hints |
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