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Side by Side Diff: net/dns/dns_client.cc

Issue 8852009: Isolates generic DnsClient from AsyncHostResolver. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: and again Created 9 years ago
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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/dns/dns_client.h"
6
7 #include "base/bind.h"
8 #include "base/string_piece.h"
9 #include "net/base/net_errors.h"
10 #include "net/dns/dns_response.h"
11 #include "net/dns/dns_session.h"
12 #include "net/dns/dns_transaction.h"
13 #include "net/socket/client_socket_factory.h"
14
15 namespace net {
16
17 DnsClient::Request::Request(const base::StringPiece& qname,
18 uint16 qtype,
19 const RequestCallback& callback)
20 : qname_(qname.data(), qname.size()),
21 qtype_(qtype),
22 callback_(callback) {
23 }
24
25 DnsClient::Request::~Request() {}
26
27 // Implementation of DnsClient that uses DnsTransaction to serve requests.
28 class DnsClientImpl : public DnsClient {
29 public:
30 class RequestImpl : public Request {
31 public:
32 RequestImpl(const base::StringPiece& qname,
33 uint16 qtype,
34 const RequestCallback& callback,
35 DnsSession* session,
36 const BoundNetLog& net_log)
37 : Request(qname, qtype, callback),
38 session_(session),
39 net_log_(net_log) {
40 }
41
42 virtual int Start() OVERRIDE {
43 transaction_.reset(new DnsTransaction(
44 session_,
45 qname(),
46 qtype(),
47 base::Bind(&RequestImpl::OnComplete, base::Unretained(this)),
48 net_log_));
49 return transaction_->Start();
50 }
51
52 void OnComplete(DnsTransaction* transaction, int rv) {
53 DCHECK_EQ(transaction_.get(), transaction);
54 // TODO(szym):
55 // - handle retransmissions here instead of DnsTransaction
56 // - handle rcode and flags here instead of DnsTransaction
57 // - update RTT in DnsSession
58 // - perform suffix search
59 // - handle DNS over TCP
60 DoCallback(rv, (rv == OK) ? transaction->response() : NULL);
61 }
62
63 private:
64 scoped_refptr<DnsSession> session_;
65 BoundNetLog net_log_;
66 scoped_ptr<DnsTransaction> transaction_;
67 };
68
69 explicit DnsClientImpl(DnsSession* session) {
70 session_ = session;
71 }
72
73 virtual Request* CreateRequest(
74 const base::StringPiece& qname,
75 uint16 qtype,
76 const RequestCallback& callback,
77 const BoundNetLog& source_net_log) OVERRIDE {
78 return new RequestImpl(qname, qtype, callback, session_, source_net_log);
79 }
80
81 private:
82 scoped_refptr<DnsSession> session_;
83 };
84
85 // static
86 DnsClient* DnsClient::CreateClient(DnsSession* session) {
87 return new DnsClientImpl(session);
88 }
89
90 } // namespace net
91
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