Revert of Revert of Move service_discovery_client_impl.* into chrome/common.

chrome/utility/local_discovery/service_discovery_client_impl.cc

Index: chrome/utility/local_discovery/service_discovery_client_impl.cc
diff --git a/chrome/utility/local_discovery/service_discovery_client_impl.cc b/chrome/utility/local_discovery/service_discovery_client_impl.cc
deleted file mode 100644
index 4aa5878b57a8081eab25b6072c1b8bff1a009031..0000000000000000000000000000000000000000
--- a/chrome/utility/local_discovery/service_discovery_client_impl.cc
+++ /dev/null
@@ -1,584 +0,0 @@
-// 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 <utility>
-
-#include "base/logging.h"
-#include "base/memory/singleton.h"
-#include "base/message_loop/message_loop_proxy.h"
-#include "base/stl_util.h"
-#include "chrome/utility/local_discovery/service_discovery_client_impl.h"
-#include "net/dns/dns_protocol.h"
-#include "net/dns/record_rdata.h"
-
-namespace local_discovery {
-
-namespace {
-// TODO(noamsml): Make this configurable through the LocalDomainResolver
-// interface.
-const int kLocalDomainSecondAddressTimeoutMs = 100;
-
-const int kInitialRequeryTimeSeconds = 1;
-const int kMaxRequeryTimeSeconds = 2; // Time for last requery
-}
-
-ServiceDiscoveryClientImpl::ServiceDiscoveryClientImpl(
-    net::MDnsClient* mdns_client) : mdns_client_(mdns_client) {
-}
-
-ServiceDiscoveryClientImpl::~ServiceDiscoveryClientImpl() {
-}
-
-scoped_ptr<ServiceWatcher> ServiceDiscoveryClientImpl::CreateServiceWatcher(
-    const std::string& service_type,
-    const ServiceWatcher::UpdatedCallback& callback) {
-  return scoped_ptr<ServiceWatcher>(new ServiceWatcherImpl(
-      service_type, callback, mdns_client_));
-}
-
-scoped_ptr<ServiceResolver> ServiceDiscoveryClientImpl::CreateServiceResolver(
-    const std::string& service_name,
-    const ServiceResolver::ResolveCompleteCallback& callback) {
-  return scoped_ptr<ServiceResolver>(new ServiceResolverImpl(
-      service_name, callback, mdns_client_));
-}
-
-scoped_ptr<LocalDomainResolver>
-ServiceDiscoveryClientImpl::CreateLocalDomainResolver(
-      const std::string& domain,
-      net::AddressFamily address_family,
-      const LocalDomainResolver::IPAddressCallback& callback) {
-  return scoped_ptr<LocalDomainResolver>(new LocalDomainResolverImpl(
-      domain, address_family, callback, mdns_client_));
-}
-
-ServiceWatcherImpl::ServiceWatcherImpl(
-    const std::string& service_type,
-    const ServiceWatcher::UpdatedCallback& callback,
-    net::MDnsClient* mdns_client)
-    : service_type_(service_type), callback_(callback), started_(false),
-      actively_refresh_services_(false), mdns_client_(mdns_client) {
-}
-
-void ServiceWatcherImpl::Start() {
-  DCHECK(!started_);
-  listener_ = mdns_client_->CreateListener(
-      net::dns_protocol::kTypePTR, service_type_, this);
-  started_ = listener_->Start();
-  if (started_)
-    ReadCachedServices();
-}
-
-ServiceWatcherImpl::~ServiceWatcherImpl() {
-}
-
-void ServiceWatcherImpl::DiscoverNewServices(bool force_update) {
-  DCHECK(started_);
-  if (force_update)
-    services_.clear();
-  SendQuery(kInitialRequeryTimeSeconds, force_update);
-}
-
-void ServiceWatcherImpl::SetActivelyRefreshServices(
-    bool actively_refresh_services) {
-  DCHECK(started_);
-  actively_refresh_services_ = actively_refresh_services;
-
-  for (ServiceListenersMap::iterator i = services_.begin();
-       i != services_.end(); i++) {
-    i->second->SetActiveRefresh(actively_refresh_services);
-  }
-}
-
-void ServiceWatcherImpl::ReadCachedServices() {
-  DCHECK(started_);
-  CreateTransaction(false /*network*/, true /*cache*/, false /*force refresh*/,
-                    &transaction_cache_);
-}
-
-bool ServiceWatcherImpl::CreateTransaction(
-    bool network, bool cache, bool force_refresh,
-    scoped_ptr<net::MDnsTransaction>* transaction) {
-  int transaction_flags = 0;
-  if (network)
-    transaction_flags |= net::MDnsTransaction::QUERY_NETWORK;
-
-  if (cache)
-    transaction_flags |= net::MDnsTransaction::QUERY_CACHE;
-
-  // TODO(noamsml): Add flag for force_refresh when supported.
-
-  if (transaction_flags) {
-    *transaction = mdns_client_->CreateTransaction(
-        net::dns_protocol::kTypePTR, service_type_, transaction_flags,
-        base::Bind(&ServiceWatcherImpl::OnTransactionResponse,
-                   base::Unretained(this), transaction));
-    return (*transaction)->Start();
-  }
-
-  return true;
-}
-
-std::string ServiceWatcherImpl::GetServiceType() const {
-  return listener_->GetName();
-}
-
-void ServiceWatcherImpl::OnRecordUpdate(
-    net::MDnsListener::UpdateType update,
-    const net::RecordParsed* record) {
-  DCHECK(started_);
-  if (record->type() == net::dns_protocol::kTypePTR) {
-    DCHECK(record->name() == GetServiceType());
-    const net::PtrRecordRdata* rdata = record->rdata<net::PtrRecordRdata>();
-
-    switch (update) {
-      case net::MDnsListener::RECORD_ADDED:
-        AddService(rdata->ptrdomain());
-        break;
-      case net::MDnsListener::RECORD_CHANGED:
-        NOTREACHED();
-        break;
-      case net::MDnsListener::RECORD_REMOVED:
-        RemovePTR(rdata->ptrdomain());
-        break;
-    }
-  } else {
-    DCHECK(record->type() == net::dns_protocol::kTypeSRV ||
-           record->type() == net::dns_protocol::kTypeTXT);
-    DCHECK(services_.find(record->name()) != services_.end());
-
-    if (record->type() == net::dns_protocol::kTypeSRV) {
-      if (update == net::MDnsListener::RECORD_REMOVED) {
-        RemoveSRV(record->name());
-      } else if (update == net::MDnsListener::RECORD_ADDED) {
-        AddSRV(record->name());
-      }
-    }
-
-    // If this is the first time we see an SRV record, do not send
-    // an UPDATE_CHANGED.
-    if (record->type() != net::dns_protocol::kTypeSRV ||
-        update != net::MDnsListener::RECORD_ADDED) {
-      DeferUpdate(UPDATE_CHANGED, record->name());
-    }
-  }
-}
-
-void ServiceWatcherImpl::OnCachePurged() {
-  // Not yet implemented.
-}
-
-void ServiceWatcherImpl::OnTransactionResponse(
-    scoped_ptr<net::MDnsTransaction>* transaction,
-    net::MDnsTransaction::Result result,
-    const net::RecordParsed* record) {
-  DCHECK(started_);
-  if (result == net::MDnsTransaction::RESULT_RECORD) {
-    const net::PtrRecordRdata* rdata = record->rdata<net::PtrRecordRdata>();
-    DCHECK(rdata);
-    AddService(rdata->ptrdomain());
-  } else if (result == net::MDnsTransaction::RESULT_DONE) {
-    transaction->reset();
-  }
-
-  // Do nothing for NSEC records. It is an error for hosts to broadcast an NSEC
-  // record for PTR records on any name.
-}
-
-ServiceWatcherImpl::ServiceListeners::ServiceListeners(
-    const std::string& service_name,
-    ServiceWatcherImpl* watcher,
-    net::MDnsClient* mdns_client)
-    : service_name_(service_name), mdns_client_(mdns_client),
-      update_pending_(false), has_ptr_(true), has_srv_(false) {
-  srv_listener_ = mdns_client->CreateListener(
-      net::dns_protocol::kTypeSRV, service_name, watcher);
-  txt_listener_ = mdns_client->CreateListener(
-      net::dns_protocol::kTypeTXT, service_name, watcher);
-}
-
-ServiceWatcherImpl::ServiceListeners::~ServiceListeners() {
-}
-
-bool ServiceWatcherImpl::ServiceListeners::Start() {
-  if (!srv_listener_->Start())
-    return false;
-  return txt_listener_->Start();
-}
-
-void ServiceWatcherImpl::ServiceListeners::SetActiveRefresh(
-    bool active_refresh) {
-  srv_listener_->SetActiveRefresh(active_refresh);
-
-  if (active_refresh && !has_srv_) {
-    DCHECK(has_ptr_);
-    srv_transaction_ = mdns_client_->CreateTransaction(
-        net::dns_protocol::kTypeSRV, service_name_,
-        net::MDnsTransaction::SINGLE_RESULT |
-        net::MDnsTransaction::QUERY_CACHE | net::MDnsTransaction::QUERY_NETWORK,
-        base::Bind(&ServiceWatcherImpl::ServiceListeners::OnSRVRecord,
-                   base::Unretained(this)));
-    srv_transaction_->Start();
-  } else if (!active_refresh) {
-    srv_transaction_.reset();
-  }
-}
-
-void ServiceWatcherImpl::ServiceListeners::OnSRVRecord(
-    net::MDnsTransaction::Result result,
-    const net::RecordParsed* record) {
-  set_has_srv(record != NULL);
-}
-
-void ServiceWatcherImpl::ServiceListeners::set_has_srv(bool has_srv) {
-  has_srv_ = has_srv;
-
-  srv_transaction_.reset();
-}
-
-void ServiceWatcherImpl::AddService(const std::string& service) {
-  DCHECK(started_);
-  std::pair<ServiceListenersMap::iterator, bool> found = services_.insert(
-      make_pair(service, linked_ptr<ServiceListeners>(NULL)));
-
-  if (found.second) {  // Newly inserted.
-    found.first->second = linked_ptr<ServiceListeners>(
-        new ServiceListeners(service, this, mdns_client_));
-    bool success = found.first->second->Start();
-    found.first->second->SetActiveRefresh(actively_refresh_services_);
-    DeferUpdate(UPDATE_ADDED, service);
-
-    DCHECK(success);
-  }
-
-  found.first->second->set_has_ptr(true);
-}
-
-void ServiceWatcherImpl::AddSRV(const std::string& service) {
-  DCHECK(started_);
-
-  ServiceListenersMap::iterator found = services_.find(service);
-  if (found != services_.end()) {
-    found->second->set_has_srv(true);
-  }
-}
-
-void ServiceWatcherImpl::DeferUpdate(ServiceWatcher::UpdateType update_type,
-                                     const std::string& service_name) {
-  ServiceListenersMap::iterator found = services_.find(service_name);
-
-  if (found != services_.end() && !found->second->update_pending()) {
-    found->second->set_update_pending(true);
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&ServiceWatcherImpl::DeliverDeferredUpdate, AsWeakPtr(),
-                   update_type, service_name));
-  }
-}
-
-void ServiceWatcherImpl::DeliverDeferredUpdate(
-    ServiceWatcher::UpdateType update_type, const std::string& service_name) {
-  ServiceListenersMap::iterator found = services_.find(service_name);
-
-  if (found != services_.end()) {
-    found->second->set_update_pending(false);
-    if (!callback_.is_null())
-      callback_.Run(update_type, service_name);
-  }
-}
-
-void ServiceWatcherImpl::RemovePTR(const std::string& service) {
-  DCHECK(started_);
-
-  ServiceListenersMap::iterator found = services_.find(service);
-  if (found != services_.end()) {
-    found->second->set_has_ptr(false);
-
-    if (!found->second->has_ptr_or_srv()) {
-      services_.erase(found);
-      if (!callback_.is_null())
-        callback_.Run(UPDATE_REMOVED, service);
-    }
-  }
-}
-
-void ServiceWatcherImpl::RemoveSRV(const std::string& service) {
-  DCHECK(started_);
-
-  ServiceListenersMap::iterator found = services_.find(service);
-  if (found != services_.end()) {
-    found->second->set_has_srv(false);
-
-    if (!found->second->has_ptr_or_srv()) {
-      services_.erase(found);
-      if (!callback_.is_null())
-        callback_.Run(UPDATE_REMOVED, service);
-    }
-  }
-}
-
-void ServiceWatcherImpl::OnNsecRecord(const std::string& name,
-                                      unsigned rrtype) {
-  // Do nothing. It is an error for hosts to broadcast an NSEC record for PTR
-  // on any name.
-}
-
-void ServiceWatcherImpl::ScheduleQuery(int timeout_seconds) {
-  if (timeout_seconds <= kMaxRequeryTimeSeconds) {
-    base::MessageLoop::current()->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&ServiceWatcherImpl::SendQuery,
-                   AsWeakPtr(),
-                   timeout_seconds * 2 /*next_timeout_seconds*/,
-                   false /*force_update*/),
-        base::TimeDelta::FromSeconds(timeout_seconds));
-  }
-}
-
-void ServiceWatcherImpl::SendQuery(int next_timeout_seconds,
-                                   bool force_update) {
-  CreateTransaction(true /*network*/, false /*cache*/, force_update,
-                    &transaction_network_);
-  ScheduleQuery(next_timeout_seconds);
-}
-
-ServiceResolverImpl::ServiceResolverImpl(
-    const std::string& service_name,
-    const ResolveCompleteCallback& callback,
-    net::MDnsClient* mdns_client)
-    : service_name_(service_name), callback_(callback),
-      metadata_resolved_(false), address_resolved_(false),
-      mdns_client_(mdns_client) {
-}
-
-void ServiceResolverImpl::StartResolving() {
-  address_resolved_ = false;
-  metadata_resolved_ = false;
-  service_staging_ = ServiceDescription();
-  service_staging_.service_name = service_name_;
-
-  if (!CreateTxtTransaction() || !CreateSrvTransaction()) {
-    ServiceNotFound(ServiceResolver::STATUS_REQUEST_TIMEOUT);
-  }
-}
-
-ServiceResolverImpl::~ServiceResolverImpl() {
-}
-
-bool ServiceResolverImpl::CreateTxtTransaction() {
-  txt_transaction_ = mdns_client_->CreateTransaction(
-      net::dns_protocol::kTypeTXT, service_name_,
-      net::MDnsTransaction::SINGLE_RESULT | net::MDnsTransaction::QUERY_CACHE |
-      net::MDnsTransaction::QUERY_NETWORK,
-      base::Bind(&ServiceResolverImpl::TxtRecordTransactionResponse,
-                 AsWeakPtr()));
-  return txt_transaction_->Start();
-}
-
-// TODO(noamsml): quick-resolve for AAAA records.  Since A records tend to be in
-void ServiceResolverImpl::CreateATransaction() {
-  a_transaction_ = mdns_client_->CreateTransaction(
-      net::dns_protocol::kTypeA,
-      service_staging_.address.host(),
-      net::MDnsTransaction::SINGLE_RESULT | net::MDnsTransaction::QUERY_CACHE,
-      base::Bind(&ServiceResolverImpl::ARecordTransactionResponse,
-                 AsWeakPtr()));
-  a_transaction_->Start();
-}
-
-bool ServiceResolverImpl::CreateSrvTransaction() {
-  srv_transaction_ = mdns_client_->CreateTransaction(
-      net::dns_protocol::kTypeSRV, service_name_,
-      net::MDnsTransaction::SINGLE_RESULT | net::MDnsTransaction::QUERY_CACHE |
-      net::MDnsTransaction::QUERY_NETWORK,
-      base::Bind(&ServiceResolverImpl::SrvRecordTransactionResponse,
-                 AsWeakPtr()));
-  return srv_transaction_->Start();
-}
-
-std::string ServiceResolverImpl::GetName() const {
-  return service_name_;
-}
-
-void ServiceResolverImpl::SrvRecordTransactionResponse(
-    net::MDnsTransaction::Result status, const net::RecordParsed* record) {
-  srv_transaction_.reset();
-  if (status == net::MDnsTransaction::RESULT_RECORD) {
-    DCHECK(record);
-    service_staging_.address = RecordToAddress(record);
-    service_staging_.last_seen = record->time_created();
-    CreateATransaction();
-  } else {
-    ServiceNotFound(MDnsStatusToRequestStatus(status));
-  }
-}
-
-void ServiceResolverImpl::TxtRecordTransactionResponse(
-    net::MDnsTransaction::Result status, const net::RecordParsed* record) {
-  txt_transaction_.reset();
-  if (status == net::MDnsTransaction::RESULT_RECORD) {
-    DCHECK(record);
-    service_staging_.metadata = RecordToMetadata(record);
-  } else {
-    service_staging_.metadata = std::vector<std::string>();
-  }
-
-  metadata_resolved_ = true;
-  AlertCallbackIfReady();
-}
-
-void ServiceResolverImpl::ARecordTransactionResponse(
-    net::MDnsTransaction::Result status, const net::RecordParsed* record) {
-  a_transaction_.reset();
-
-  if (status == net::MDnsTransaction::RESULT_RECORD) {
-    DCHECK(record);
-    service_staging_.ip_address = RecordToIPAddress(record);
-  } else {
-    service_staging_.ip_address = net::IPAddressNumber();
-  }
-
-  address_resolved_ = true;
-  AlertCallbackIfReady();
-}
-
-void ServiceResolverImpl::AlertCallbackIfReady() {
-  if (metadata_resolved_ && address_resolved_) {
-    txt_transaction_.reset();
-    srv_transaction_.reset();
-    a_transaction_.reset();
-    if (!callback_.is_null())
-      callback_.Run(STATUS_SUCCESS, service_staging_);
-  }
-}
-
-void ServiceResolverImpl::ServiceNotFound(
-    ServiceResolver::RequestStatus status) {
-  txt_transaction_.reset();
-  srv_transaction_.reset();
-  a_transaction_.reset();
-  if (!callback_.is_null())
-    callback_.Run(status, ServiceDescription());
-}
-
-ServiceResolver::RequestStatus ServiceResolverImpl::MDnsStatusToRequestStatus(
-    net::MDnsTransaction::Result status) const {
-  switch (status) {
-    case net::MDnsTransaction::RESULT_RECORD:
-      return ServiceResolver::STATUS_SUCCESS;
-    case net::MDnsTransaction::RESULT_NO_RESULTS:
-      return ServiceResolver::STATUS_REQUEST_TIMEOUT;
-    case net::MDnsTransaction::RESULT_NSEC:
-      return ServiceResolver::STATUS_KNOWN_NONEXISTENT;
-    case net::MDnsTransaction::RESULT_DONE:  // Pass through.
-    default:
-      NOTREACHED();
-      return ServiceResolver::STATUS_REQUEST_TIMEOUT;
-  }
-}
-
-const std::vector<std::string>& ServiceResolverImpl::RecordToMetadata(
-    const net::RecordParsed* record) const {
-  DCHECK(record->type() == net::dns_protocol::kTypeTXT);
-  const net::TxtRecordRdata* txt_rdata = record->rdata<net::TxtRecordRdata>();
-  DCHECK(txt_rdata);
-  return txt_rdata->texts();
-}
-
-net::HostPortPair ServiceResolverImpl::RecordToAddress(
-    const net::RecordParsed* record) const {
-  DCHECK(record->type() == net::dns_protocol::kTypeSRV);
-  const net::SrvRecordRdata* srv_rdata = record->rdata<net::SrvRecordRdata>();
-  DCHECK(srv_rdata);
-  return net::HostPortPair(srv_rdata->target(), srv_rdata->port());
-}
-
-const net::IPAddressNumber& ServiceResolverImpl::RecordToIPAddress(
-    const net::RecordParsed* record) const {
-  DCHECK(record->type() == net::dns_protocol::kTypeA);
-  const net::ARecordRdata* a_rdata = record->rdata<net::ARecordRdata>();
-  DCHECK(a_rdata);
-  return a_rdata->address();
-}
-
-LocalDomainResolverImpl::LocalDomainResolverImpl(
-    const std::string& domain,
-    net::AddressFamily address_family,
-    const IPAddressCallback& callback,
-    net::MDnsClient* mdns_client)
-    : domain_(domain), address_family_(address_family), callback_(callback),
-      transactions_finished_(0), mdns_client_(mdns_client) {
-}
-
-LocalDomainResolverImpl::~LocalDomainResolverImpl() {
-  timeout_callback_.Cancel();
-}
-
-void LocalDomainResolverImpl::Start() {
-  if (address_family_ == net::ADDRESS_FAMILY_IPV4 ||
-      address_family_ == net::ADDRESS_FAMILY_UNSPECIFIED) {
-    transaction_a_ = CreateTransaction(net::dns_protocol::kTypeA);
-    transaction_a_->Start();
-  }
-
-  if (address_family_ == net::ADDRESS_FAMILY_IPV6 ||
-      address_family_ == net::ADDRESS_FAMILY_UNSPECIFIED) {
-    transaction_aaaa_ = CreateTransaction(net::dns_protocol::kTypeAAAA);
-    transaction_aaaa_->Start();
-  }
-}
-
-scoped_ptr<net::MDnsTransaction> LocalDomainResolverImpl::CreateTransaction(
-    uint16 type) {
-  return mdns_client_->CreateTransaction(
-      type, domain_, net::MDnsTransaction::SINGLE_RESULT |
-                     net::MDnsTransaction::QUERY_CACHE |
-                     net::MDnsTransaction::QUERY_NETWORK,
-      base::Bind(&LocalDomainResolverImpl::OnTransactionComplete,
-                 base::Unretained(this)));
-}
-
-void LocalDomainResolverImpl::OnTransactionComplete(
-    net::MDnsTransaction::Result result, const net::RecordParsed* record) {
-  transactions_finished_++;
-
-  if (result == net::MDnsTransaction::RESULT_RECORD) {
-    if (record->type() == net::dns_protocol::kTypeA) {
-      const net::ARecordRdata* rdata = record->rdata<net::ARecordRdata>();
-      address_ipv4_ = rdata->address();
-    } else {
-      DCHECK_EQ(net::dns_protocol::kTypeAAAA, record->type());
-      const net::AAAARecordRdata* rdata = record->rdata<net::AAAARecordRdata>();
-      address_ipv6_ = rdata->address();
-    }
-  }
-
-  if (transactions_finished_ == 1 &&
-      address_family_ == net::ADDRESS_FAMILY_UNSPECIFIED) {
-    timeout_callback_.Reset(base::Bind(
-        &LocalDomainResolverImpl::SendResolvedAddresses,
-        base::Unretained(this)));
-
-    base::MessageLoop::current()->PostDelayedTask(
-        FROM_HERE,
-        timeout_callback_.callback(),
-        base::TimeDelta::FromMilliseconds(kLocalDomainSecondAddressTimeoutMs));
-  } else if (transactions_finished_ == 2
-      || address_family_ != net::ADDRESS_FAMILY_UNSPECIFIED) {
-    SendResolvedAddresses();
-  }
-}
-
-bool LocalDomainResolverImpl::IsSuccess() {
-  return !address_ipv4_.empty() || !address_ipv6_.empty();
-}
-
-void LocalDomainResolverImpl::SendResolvedAddresses() {
-  transaction_a_.reset();
-  transaction_aaaa_.reset();
-  timeout_callback_.Cancel();
-  callback_.Run(IsSuccess(), address_ipv4_, address_ipv6_);
-}
-
-}  // namespace local_discovery