/*
 * Created by PyramIDE.
 * User: ricard
 * Date: 02/02/2008
 * Time: 11:47
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */


read tools/basis.anubis
read system/muscle.anubis
read system/data_io.anubis
read system/convert.anubis
read system/string.anubis
read system/message_queue.anubis
read system/message_transceiver.anubis
read tools/connections.anubis

read calexium_lib/CXM_message_constants.anubis
read calexium_lib/net_services/CXM_net_services.anubis
read calexium_lib/net_services/CXM_generic_protocol.anubis

// --Generic types---------------------------------------------------------------------
public type NetServiceAnswer:
  netservice_error (Word32 cmd,
                    Word32 result_code,
                    String result_string),
  netservice_ok    (Word32 cmd,
                    Maybe(Message) result_msg).

// --Generic functions---------------------------------------------------------------------

  
/**
 * Sends the message to the server then parses the answer and returns the RESULT message on CMD success.
 */
public define Maybe(NetServiceAnswer)
  generic_send_message
  (
    MessageQueue            queue,
    Message                 msg_to_send,
    Int                     timeout,
    (String) -> One         logger
  )=
  queue.add_Message_to_send(msg_to_send);
  if queue.get_next_received_Message(timeout) is
  {
    timeout then logger("["+queue.get_name(unique)+"]: receive timeout");failure,
    closed  then logger("["+queue.get_name(unique)+"]: socket closed");failure,
    msg(msg)  then
      if find_int32(msg, "CMD") is
      {
        failure       then logger("["+queue.get_name(unique)+"]: CMD field not found"); failure,
        success(cmd)  then 
          if find_int32(msg, "STATUS") is
          {
            failure     then logger("["+queue.get_name(unique)+"]: STATUS field not found"); failure,
            success(v)  then 
              if v = _CXM_OK then 
                success(netservice_ok(cmd, find_message(msg, "RESULT")))
              else
                with error_string = if find_string(msg, "STATUS_MSG") is success(s) then s else "",
                success(netservice_error(cmd, v, error_string))
          }
      }
  }.
  
public define Maybe($T)
  simple_handler
  (
    MessageQueue            queue,
    String                  timestamp,
    Int                     timeout,
    Message                 msg_to_send,
    (Message, MessageQueue, String) -> Maybe($T)  handler,
    (String) -> One         logger
  ) =
  if generic_send_message(queue, msg_to_send, timeout, logger) is
  {
    failure then failure,
    success(net_result) then
      if net_result is
      {
        netservice_error(cmd, err_code, err_str) then 
          logger("["+queue.get_name(unique)+"]: message status ERROR [0x" + to_hexa(err_code) + ", '" + err_str + "']");
          failure,
        netservice_ok(cmd, mb_msg) then 
          if mb_msg is
          {
            failure         then logger("["+queue.get_name(unique)+"]: can't find RESULT message."); failure,
            success(result) then handler(result, queue, timestamp)
          }
      }
  }.

public define Maybe(One)
  no_result_handler
  (
    MessageQueue            queue,
    Int                     timeout,
    Message                 msg_to_send,
    (String) -> One         logger
  ) =
  if generic_send_message(queue, msg_to_send, timeout, logger) is
  {
    failure then failure,
    success(net_result) then
      if net_result is
      {
        netservice_error(cmd, err_code, err_str) then 
          logger("["+queue.get_name(unique)+"]: message status ERROR [0x" + to_hexa(err_code) + ", '" + err_str + "']");
          failure,
        netservice_ok(cmd, mb_msg) then 
          if mb_msg is
          {
            failure         then unique,
            success(result) then logger("An unattended RESULT msg was found. Ignoring it...")
          };
          success(unique)
      }
  }.

public define (MessageQueue, String) -> Maybe($T)
  make_generic_handler
  (
    Int                     timeout,
    Message                 msg_to_send,
    (Message, MessageQueue, String) -> Maybe($T)  handler,
    (String) -> One         logger
  ) =
  (MessageQueue queue, String timestamp) |->
  simple_handler(queue, timestamp, timeout, msg_to_send, handler, logger).

define Maybe($T)
  generic_request_for_service
  (
    MessageQueue                queue,
    Word32                       service_id,
    Word32                       service_version,
    (MessageQueue, String) -> Maybe($T) handler,
    (String) -> One             logger
  )=
  with test_msg = message(_CXM_REQUEST_FOR_SERVICE),
  forget(add_int32(test_msg, "SERVICE", service_id));
  forget(add_int32(test_msg, "VERSION", service_version));
  queue.add_Message_to_send(test_msg);
  if queue.get_next_received_Message(10) is
  {
    timeout then logger("["+queue.get_name(unique)+"]: requesting service receive timeout");failure,
    closed  then logger("["+queue.get_name(unique)+"]: requesting service socket closed");failure,
    msg(msg)  then 
      if find_int32(msg, "STATUS") is
      {
        failure     then logger("["+queue.get_name(unique)+"]: requesting service STATUS not found");failure,
        success(v)  then 
          if v = _CXM_OK then 
            if find_message(msg, "RESULT") is
            {
              failure     then logger("["+queue.get_name(unique)+"]: requesting service RESULT not found");failure,
              success(result)  then 
                with timestamp =  if find_string(result, "TIMESTAMP") is
                                  {
                                    failure     then logger("["+queue.get_name(unique)+"]: requesting service TIMESTAMP not found"); "",
                                    success(timestamp)  then timestamp
                                  },
                handler(queue, timestamp)
            }
          else
            logger("["+queue.get_name(unique)+"]: the requested service is not available on server.");failure        
      }
  }.

public define Maybe($T)
  generic_connect_to_net_service
  (
    String                      queue_name,
    Word32                       server,
    Word32                       port,
    Word32                       service_id,
    Word32                       service_version,
    (MessageQueue, String) -> Maybe($T) handler,
    (String) -> One             logger
  )
  =
  if connect( server, port) is
  {
    error(_)  then logger(queue_name + ": Can't connect to domain manager ["+ip_addr_to_string(server)+":"+port+"]");failure,
    ok(conn)  then 
//      println("[" + virtual_machine_id + "] netservices create queue");
      with queue = create_MessageQueue(queue_name),
      message_transceiver(tcp(conn), queue);
//      println("[" + virtual_machine_id + "] netservices generic_request_for_service()");
      with result = generic_request_for_service(queue, service_id, service_version, handler, logger),
//      println("[" + virtual_machine_id + "] netservices client quit");
      queue.quit(unique);
      result
  }.

public define Maybe($T)
  generic_connect_to_net_service_SSL
  (
    String                      queue_name,
    String                      server_name,
    Word32                      server_ip,
    Word32                      port,
    (Maybe(X509)) -> Bool       accept_policy,  // your policy for accepting the server certificate in 
                                                // case of an invalid, non trusted or missing certificate
    Word32                      service_id,
    Word32                      service_version,
    (MessageQueue, String) -> Maybe($T) handler,
    (String) -> One             logger
  )
  =
  if open_SSL_connection( server_name, server_ip, port, accept_policy) is
  {
    error(_)  then logger(queue_name + ": Can't connect to domain manager ["+ip_addr_to_string(server_ip)+":"+port+"]");failure,
    ok(conn)  then 
      with queue = create_MessageQueue(queue_name),
      message_transceiver(ssl(conn), queue);
      with result = generic_request_for_service(queue, service_id, service_version, handler, logger),
      queue.quit(unique);
      //logInfo(debug_log,"domain_manager client quit");
      result
  }.