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+//
+// resolver_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
+#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <cstring>
+#include <boost/scoped_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/error.hpp>
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/detail/bind_handler.hpp>
+#include <boost/asio/detail/mutex.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/detail/service_base.hpp>
+#include <boost/asio/detail/socket_ops.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+#include <boost/asio/detail/thread.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class resolver_service
+  : public boost::asio::detail::service_base<resolver_service<Protocol> >
+{
+private:
+  // Helper class to perform exception-safe cleanup of addrinfo objects.
+  class auto_addrinfo
+    : private boost::asio::detail::noncopyable
+  {
+  public:
+    explicit auto_addrinfo(boost::asio::detail::addrinfo_type* ai)
+      : ai_(ai)
+    {
+    }
+
+    ~auto_addrinfo()
+    {
+      if (ai_)
+        socket_ops::freeaddrinfo(ai_);
+    }
+
+    operator boost::asio::detail::addrinfo_type*()
+    {
+      return ai_;
+    }
+
+  private:
+    boost::asio::detail::addrinfo_type* ai_;
+  };
+
+public:
+  // The implementation type of the resolver. The shared pointer is used as a
+  // cancellation token to indicate to the background thread that the operation
+  // has been cancelled.
+  typedef boost::shared_ptr<void> implementation_type;
+  struct noop_deleter { void operator()(void*) {} };
+
+  // The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  // The query type.
+  typedef typename Protocol::resolver_query query_type;
+
+  // The iterator type.
+  typedef typename Protocol::resolver_iterator iterator_type;
+
+  // Constructor.
+  resolver_service(boost::asio::io_service& io_service)
+    : boost::asio::detail::service_base<
+        resolver_service<Protocol> >(io_service),
+      mutex_(),
+      work_io_service_(new boost::asio::io_service),
+      work_(new boost::asio::io_service::work(*work_io_service_)),
+      work_thread_(0)
+  {
+  }
+
+  // Destructor.
+  ~resolver_service()
+  {
+    shutdown_service();
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    work_.reset();
+    if (work_io_service_)
+    {
+      work_io_service_->stop();
+      if (work_thread_)
+      {
+        work_thread_->join();
+        work_thread_.reset();
+      }
+      work_io_service_.reset();
+    }
+  }
+
+  // Construct a new resolver implementation.
+  void construct(implementation_type& impl)
+  {
+    impl.reset(static_cast<void*>(0), noop_deleter());
+  }
+
+  // Destroy a resolver implementation.
+  void destroy(implementation_type&)
+  {
+  }
+
+  // Cancel pending asynchronous operations.
+  void cancel(implementation_type& impl)
+  {
+    impl.reset(static_cast<void*>(0), noop_deleter());
+  }
+
+  // Resolve a query to a list of entries.
+  iterator_type resolve(implementation_type&, const query_type& query,
+      boost::system::error_code& ec)
+  {
+    boost::asio::detail::addrinfo_type* address_info = 0;
+    std::string host_name = query.host_name();
+    std::string service_name = query.service_name();
+    boost::asio::detail::addrinfo_type hints = query.hints();
+
+    socket_ops::getaddrinfo(host_name.length() ? host_name.c_str() : 0,
+        service_name.c_str(), &hints, &address_info, ec);
+    auto_addrinfo auto_address_info(address_info);
+
+    if (ec)
+      return iterator_type();
+
+    return iterator_type::create(address_info, host_name, service_name);
+  }
+
+  template <typename Handler>
+  class resolve_query_handler
+  {
+  public:
+    resolve_query_handler(implementation_type impl, const query_type& query,
+        boost::asio::io_service& io_service, Handler handler)
+      : impl_(impl),
+        query_(query),
+        io_service_(io_service),
+        work_(io_service),
+        handler_(handler)
+    {
+    }
+
+    void operator()()
+    {
+      // Check if the operation has been cancelled.
+      if (impl_.expired())
+      {
+        iterator_type iterator;
+        io_service_.post(boost::asio::detail::bind_handler(handler_,
+              boost::asio::error::operation_aborted, iterator));
+        return;
+      }
+
+      // Perform the blocking host resolution operation.
+      boost::asio::detail::addrinfo_type* address_info = 0;
+      std::string host_name = query_.host_name();
+      std::string service_name = query_.service_name();
+      boost::asio::detail::addrinfo_type hints = query_.hints();
+      boost::system::error_code ec;
+      socket_ops::getaddrinfo(host_name.length() ? host_name.c_str() : 0,
+          service_name.c_str(), &hints, &address_info, ec);
+      auto_addrinfo auto_address_info(address_info);
+
+      // Invoke the handler and pass the result.
+      iterator_type iterator;
+      if (!ec)
+        iterator = iterator_type::create(address_info, host_name, service_name);
+      io_service_.post(boost::asio::detail::bind_handler(
+            handler_, ec, iterator));
+    }
+
+  private:
+    boost::weak_ptr<void> impl_;
+    query_type query_;
+    boost::asio::io_service& io_service_;
+    boost::asio::io_service::work work_;
+    Handler handler_;
+  };
+
+  // Asynchronously resolve a query to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl, const query_type& query,
+      Handler handler)
+  {
+    if (work_io_service_)
+    {
+      start_work_thread();
+      work_io_service_->post(
+          resolve_query_handler<Handler>(
+            impl, query, this->get_io_service(), handler));
+    }
+  }
+
+  // Resolve an endpoint to a list of entries.
+  iterator_type resolve(implementation_type&,
+      const endpoint_type& endpoint, boost::system::error_code& ec)
+  {
+    // First try resolving with the service name. If that fails try resolving
+    // but allow the service to be returned as a number.
+    char host_name[NI_MAXHOST];
+    char service_name[NI_MAXSERV];
+    int flags = endpoint.protocol().type() == SOCK_DGRAM ? NI_DGRAM : 0;
+    socket_ops::getnameinfo(endpoint.data(), endpoint.size(),
+        host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+    if (ec)
+    {
+      flags |= NI_NUMERICSERV;
+      socket_ops::getnameinfo(endpoint.data(), endpoint.size(),
+          host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+    }
+
+    if (ec)
+      return iterator_type();
+
+    return iterator_type::create(endpoint, host_name, service_name);
+  }
+
+  template <typename Handler>
+  class resolve_endpoint_handler
+  {
+  public:
+    resolve_endpoint_handler(implementation_type impl,
+        const endpoint_type& endpoint, boost::asio::io_service& io_service,
+        Handler handler)
+      : impl_(impl),
+        endpoint_(endpoint),
+        io_service_(io_service),
+        work_(io_service),
+        handler_(handler)
+    {
+    }
+
+    void operator()()
+    {
+      // Check if the operation has been cancelled.
+      if (impl_.expired())
+      {
+        iterator_type iterator;
+        io_service_.post(boost::asio::detail::bind_handler(handler_,
+              boost::asio::error::operation_aborted, iterator));
+        return;
+      }
+
+
+      // First try resolving with the service name. If that fails try resolving
+      // but allow the service to be returned as a number.
+      char host_name[NI_MAXHOST];
+      char service_name[NI_MAXSERV];
+      int flags = endpoint_.protocol().type() == SOCK_DGRAM ? NI_DGRAM : 0;
+      boost::system::error_code ec;
+      socket_ops::getnameinfo(endpoint_.data(), endpoint_.size(),
+          host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+      if (ec)
+      {
+        flags |= NI_NUMERICSERV;
+        socket_ops::getnameinfo(endpoint_.data(), endpoint_.size(),
+            host_name, NI_MAXHOST, service_name, NI_MAXSERV, flags, ec);
+      }
+
+      // Invoke the handler and pass the result.
+      iterator_type iterator;
+      if (!ec)
+        iterator = iterator_type::create(endpoint_, host_name, service_name);
+      io_service_.post(boost::asio::detail::bind_handler(
+            handler_, ec, iterator));
+    }
+
+  private:
+    boost::weak_ptr<void> impl_;
+    endpoint_type endpoint_;
+    boost::asio::io_service& io_service_;
+    boost::asio::io_service::work work_;
+    Handler handler_;
+  };
+
+  // Asynchronously resolve an endpoint to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl, const endpoint_type& endpoint,
+      Handler handler)
+  {
+    if (work_io_service_)
+    {
+      start_work_thread();
+      work_io_service_->post(
+          resolve_endpoint_handler<Handler>(
+            impl, endpoint, this->get_io_service(), handler));
+    }
+  }
+
+private:
+  // Helper class to run the work io_service in a thread.
+  class work_io_service_runner
+  {
+  public:
+    work_io_service_runner(boost::asio::io_service& io_service)
+      : io_service_(io_service) {}
+    void operator()() { io_service_.run(); }
+  private:
+    boost::asio::io_service& io_service_;
+  };
+
+  // Start the work thread if it's not already running.
+  void start_work_thread()
+  {
+    boost::asio::detail::mutex::scoped_lock lock(mutex_);
+    if (!work_thread_)
+    {
+      work_thread_.reset(new boost::asio::detail::thread(
+            work_io_service_runner(*work_io_service_)));
+    }
+  }
+
+  // Mutex to protect access to internal data.
+  boost::asio::detail::mutex mutex_;
+
+  // Private io_service used for performing asynchronous host resolution.
+  boost::scoped_ptr<boost::asio::io_service> work_io_service_;
+
+  // Work for the private io_service to perform.
+  boost::scoped_ptr<boost::asio::io_service::work> work_;
+
+  // Thread used for running the work io_service's run loop.
+  boost::scoped_ptr<boost::asio::detail::thread> work_thread_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP