Revert 211950 "Display DNS probe results."

chrome/browser/net/dns_probe_runner.cc

-// Copyright 2013 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 "chrome/browser/net/dns_probe_runner.h"
-
-#include "base/bind.h"
-#include "content/public/browser/browser_thread.h"
-#include "net/base/address_list.h"
-#include "net/base/ip_endpoint.h"
-#include "net/base/net_errors.h"
-#include "net/base/net_log.h"
-#include "net/base/net_util.h"
-#include "net/base/network_change_notifier.h"
-#include "net/dns/dns_client.h"
-#include "net/dns/dns_protocol.h"
-#include "net/dns/dns_response.h"
-#include "net/dns/dns_transaction.h"
-
-using base::TimeDelta;
-using content::BrowserThread;
-using net::AddressList;
-using net::BoundNetLog;
-using net::DnsClient;
-using net::DnsResponse;
-using net::DnsTransaction;
-using net::IPAddressNumber;
-using net::IPEndPoint;
-using net::NetLog;
-using net::NetworkChangeNotifier;
-using net::ParseIPLiteralToNumber;
-
-namespace chrome_browser_net {
-
-const char* DnsProbeRunner::kKnownGoodHostname = "google.com";
-
-namespace {
-
-DnsProbeRunner::Result EvaluateResponse(
-    int net_error,
-    const DnsResponse* response) {
-  switch (net_error) {
-    case net::OK:
-      break;
-
-    // ERR_NAME_NOT_RESOLVED maps to NXDOMAIN, which means the server is working
-    // but gave us a wrong answer.
-    case net::ERR_NAME_NOT_RESOLVED:
-      return DnsProbeRunner::INCORRECT;
-
-    // These results mean we heard *something* from the DNS server, but it was
-    // unsuccessful (SERVFAIL) or malformed.
-    case net::ERR_DNS_MALFORMED_RESPONSE:
-    case net::ERR_DNS_SERVER_REQUIRES_TCP:  // Shouldn't happen; DnsTransaction
-                                            // will retry with TCP.
-    case net::ERR_DNS_SERVER_FAILED:
-    case net::ERR_DNS_SORT_ERROR:  // Can only happen if the server responds.
-      return DnsProbeRunner::FAILING;
-
-    // Any other error means we never reached the DNS server in the first place.
-    case net::ERR_DNS_TIMED_OUT:
-    default:
-      // Something else happened, probably at a network level.
-      return DnsProbeRunner::UNREACHABLE;
-  }
-
-  AddressList addr_list;
-  TimeDelta ttl;
-  DnsResponse::Result result = response->ParseToAddressList(&addr_list, &ttl);
-
-  if (result != DnsResponse::DNS_PARSE_OK) {
-    return DnsProbeRunner::FAILING;
-  }
-
-  if (addr_list.empty()) {
-    return DnsProbeRunner::INCORRECT;
-  }
-
-  return DnsProbeRunner::CORRECT;
-}
-
-}  // namespace
-
-DnsProbeRunner::DnsProbeRunner() : weak_factory_(this), result_(UNKNOWN) {}
-
-DnsProbeRunner::~DnsProbeRunner() {}
-
-void DnsProbeRunner::SetClient(scoped_ptr<net::DnsClient> client) {
-  client_ = client.Pass();
-}
-
-void DnsProbeRunner::RunProbe(const base::Closure& callback) {
-  DCHECK(!callback.is_null());
-  DCHECK(client_.get());
-  DCHECK(callback_.is_null());
-  DCHECK(!transaction_.get());
-
-  callback_ = callback;
-  transaction_ = client_->GetTransactionFactory()->CreateTransaction(
-      kKnownGoodHostname,
-      net::dns_protocol::kTypeA,
-      base::Bind(&DnsProbeRunner::OnTransactionComplete,
-                 weak_factory_.GetWeakPtr()),
-      BoundNetLog());
-
-  int rv = transaction_->Start();
-  if (rv != net::ERR_IO_PENDING)
-    OnTransactionComplete(transaction_.get(), rv, NULL);
-}
-
-bool DnsProbeRunner::IsRunning() const {
-  return !callback_.is_null();
-}
-
-void DnsProbeRunner::OnTransactionComplete(
-    DnsTransaction* transaction,
-    int net_error,
-    const DnsResponse* response) {
-  DCHECK(!callback_.is_null());
-  DCHECK(transaction_.get());
-  DCHECK_EQ(transaction_.get(), transaction);
-
-  result_ = EvaluateResponse(net_error, response);
-  transaction_.reset();
-
-  BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(&DnsProbeRunner::CallCallback,
-                 weak_factory_.GetWeakPtr()));
-}
-
-void DnsProbeRunner::CallCallback() {
-  DCHECK(!callback_.is_null());
-  DCHECK(!transaction_.get());
-
-  // Clear callback in case it starts a new probe immediately.
-  const base::Closure callback = callback_;
-  callback_.Reset();
-  callback.Run();
-}
-
-}  // namespace chrome_browser_net