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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/base/host_resolver.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "net/base/net_errors.h"
namespace net {
HostResolver::RequestInfo::RequestInfo(const HostPortPair& host_port_pair)
: host_port_pair_(host_port_pair),
address_family_(ADDRESS_FAMILY_UNSPECIFIED),
host_resolver_flags_(0),
allow_cached_response_(true),
only_use_cached_response_(false),
is_speculative_(false),
priority_(MEDIUM) {
}
HostResolver::~HostResolver() {
}
AddressFamily HostResolver::GetDefaultAddressFamily() const {
return ADDRESS_FAMILY_UNSPECIFIED;
}
HostResolverImpl* HostResolver::GetAsHostResolverImpl() {
return NULL;
}
HostResolver::HostResolver() {
}
SingleRequestHostResolver::SingleRequestHostResolver(HostResolver* resolver)
: resolver_(resolver),
cur_request_(NULL),
cur_request_callback_(NULL),
ALLOW_THIS_IN_INITIALIZER_LIST(
callback_(this, &SingleRequestHostResolver::OnResolveCompletion)) {
DCHECK(resolver_ != NULL);
}
SingleRequestHostResolver::~SingleRequestHostResolver() {
Cancel();
}
int SingleRequestHostResolver::Resolve(const HostResolver::RequestInfo& info,
AddressList* addresses,
CompletionCallback* callback,
const BoundNetLog& net_log) {
DCHECK(!cur_request_ && !cur_request_callback_) << "resolver already in use";
HostResolver::RequestHandle request = NULL;
// We need to be notified of completion before |callback| is called, so that
// we can clear out |cur_request_*|.
CompletionCallback* transient_callback = callback ? &callback_ : NULL;
int rv = resolver_->Resolve(
info, addresses, transient_callback, &request, net_log);
if (rv == ERR_IO_PENDING) {
// Cleared in OnResolveCompletion().
cur_request_ = request;
cur_request_callback_ = callback;
}
return rv;
}
void SingleRequestHostResolver::Cancel() {
if (cur_request_) {
resolver_->CancelRequest(cur_request_);
cur_request_ = NULL;
}
}
void SingleRequestHostResolver::OnResolveCompletion(int result) {
DCHECK(cur_request_ && cur_request_callback_);
CompletionCallback* callback = cur_request_callback_;
// Clear the outstanding request information.
cur_request_ = NULL;
cur_request_callback_ = NULL;
// Call the user's original callback.
callback->Run(result);
}
} // namespace net
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