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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/dns_client.h"
#include "base/bind.h"
#include "base/string_piece.h"
#include "net/base/net_errors.h"
#include "net/dns/dns_response.h"
#include "net/dns/dns_session.h"
#include "net/dns/dns_transaction.h"
#include "net/socket/client_socket_factory.h"
namespace net {
DnsClient::Request::Request(const base::StringPiece& qname,
uint16 qtype,
const RequestCallback& callback)
: qname_(qname.data(), qname.size()),
qtype_(qtype),
callback_(callback) {
}
DnsClient::Request::~Request() {}
// Implementation of DnsClient that uses DnsTransaction to serve requests.
class DnsClientImpl : public DnsClient {
public:
class RequestImpl : public Request {
public:
RequestImpl(const base::StringPiece& qname,
uint16 qtype,
const RequestCallback& callback,
DnsSession* session,
const BoundNetLog& net_log)
: Request(qname, qtype, callback),
session_(session),
net_log_(net_log) {
}
virtual int Start() OVERRIDE {
transaction_.reset(new DnsTransaction(
session_,
qname(),
qtype(),
base::Bind(&RequestImpl::OnComplete, base::Unretained(this)),
net_log_));
return transaction_->Start();
}
void OnComplete(DnsTransaction* transaction, int rv) {
DCHECK_EQ(transaction_.get(), transaction);
// TODO(szym):
// - handle retransmissions here instead of DnsTransaction
// - handle rcode and flags here instead of DnsTransaction
// - update RTT in DnsSession
// - perform suffix search
// - handle DNS over TCP
DoCallback(rv, (rv == OK) ? transaction->response() : NULL);
}
private:
scoped_refptr<DnsSession> session_;
BoundNetLog net_log_;
scoped_ptr<DnsTransaction> transaction_;
};
explicit DnsClientImpl(DnsSession* session) {
session_ = session;
}
virtual Request* CreateRequest(
const base::StringPiece& qname,
uint16 qtype,
const RequestCallback& callback,
const BoundNetLog& source_net_log) OVERRIDE {
return new RequestImpl(qname, qtype, callback, session_, source_net_log);
}
private:
scoped_refptr<DnsSession> session_;
};
// static
DnsClient* DnsClient::CreateClient(DnsSession* session) {
return new DnsClientImpl(session);
}
} // namespace net
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