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// Copyright 2015 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/mojo_host_resolver_impl.h"
#include <utility>
#include "base/stl_util.h"
#include "net/base/address_list.h"
#include "net/base/net_errors.h"
#include "net/dns/host_resolver.h"
#include "net/dns/mojo_host_type_converters.h"
namespace net {
// Handles host resolution for a single request and sends a response when done.
// Also detects connection errors for HostResolverRequestClient and cancels the
// outstanding resolve request. Owned by MojoHostResolverImpl.
class MojoHostResolverImpl::Job {
public:
Job(MojoHostResolverImpl* resolver_service,
net::HostResolver* resolver,
const net::HostResolver::RequestInfo& request_info,
const BoundNetLog& net_log,
interfaces::HostResolverRequestClientPtr client);
~Job();
void Start();
private:
// Completion callback for the HostResolver::Resolve request.
void OnResolveDone(int result);
// Mojo error handler.
void OnConnectionError();
MojoHostResolverImpl* resolver_service_;
net::HostResolver* resolver_;
net::HostResolver::RequestInfo request_info_;
const BoundNetLog net_log_;
interfaces::HostResolverRequestClientPtr client_;
net::HostResolver::RequestHandle handle_;
AddressList result_;
base::ThreadChecker thread_checker_;
};
MojoHostResolverImpl::MojoHostResolverImpl(net::HostResolver* resolver,
const BoundNetLog& net_log)
: resolver_(resolver), net_log_(net_log) {
}
MojoHostResolverImpl::~MojoHostResolverImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
STLDeleteElements(&pending_jobs_);
}
void MojoHostResolverImpl::Resolve(
interfaces::HostResolverRequestInfoPtr request_info,
interfaces::HostResolverRequestClientPtr client) {
DCHECK(thread_checker_.CalledOnValidThread());
Job* job = new Job(this, resolver_,
request_info->To<net::HostResolver::RequestInfo>(),
net_log_, std::move(client));
pending_jobs_.insert(job);
job->Start();
}
void MojoHostResolverImpl::DeleteJob(Job* job) {
DCHECK(thread_checker_.CalledOnValidThread());
size_t num_erased = pending_jobs_.erase(job);
DCHECK(num_erased);
delete job;
}
MojoHostResolverImpl::Job::Job(
MojoHostResolverImpl* resolver_service,
net::HostResolver* resolver,
const net::HostResolver::RequestInfo& request_info,
const BoundNetLog& net_log,
interfaces::HostResolverRequestClientPtr client)
: resolver_service_(resolver_service),
resolver_(resolver),
request_info_(request_info),
net_log_(net_log),
client_(std::move(client)),
handle_(nullptr) {
client_.set_connection_error_handler(base::Bind(
&MojoHostResolverImpl::Job::OnConnectionError, base::Unretained(this)));
}
void MojoHostResolverImpl::Job::Start() {
DVLOG(1) << "Resolve " << request_info_.host_port_pair().ToString();
int result =
resolver_->Resolve(request_info_, DEFAULT_PRIORITY, &result_,
base::Bind(&MojoHostResolverImpl::Job::OnResolveDone,
base::Unretained(this)),
&handle_, net_log_);
if (result != ERR_IO_PENDING)
OnResolveDone(result);
}
MojoHostResolverImpl::Job::~Job() {
DCHECK(thread_checker_.CalledOnValidThread());
if (handle_)
resolver_->CancelRequest(handle_);
}
void MojoHostResolverImpl::Job::OnResolveDone(int result) {
DCHECK(thread_checker_.CalledOnValidThread());
handle_ = nullptr;
DVLOG(1) << "Resolved " << request_info_.host_port_pair().ToString()
<< " with error " << result << " and " << result_.size()
<< " results!";
for (const auto& address : result_) {
DVLOG(1) << address.ToString();
}
if (result == OK)
client_->ReportResult(result, interfaces::AddressList::From(result_));
else
client_->ReportResult(result, nullptr);
resolver_service_->DeleteJob(this);
}
void MojoHostResolverImpl::Job::OnConnectionError() {
DCHECK(thread_checker_.CalledOnValidThread());
// |resolver_service_| should always outlive us.
DCHECK(resolver_service_);
DVLOG(1) << "Connection error on request for "
<< request_info_.host_port_pair().ToString();
resolver_service_->DeleteJob(this);
}
} // namespace net
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