/*
   Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include <ndb_global.h>

#include <ConfigRetriever.hpp>

#include <SocketServer.hpp>
#include <NdbSleep.h>

#include <mgmapi.h>
#include <mgmapi_config_parameters.h>
#include <mgmapi_configuration.hpp>
#include <mgmapi_internal.h>
#include <ConfigValues.hpp>


//****************************************************************************
//****************************************************************************

ConfigRetriever::ConfigRetriever(const char * _connect_string,
                                 int force_nodeid,
				 Uint32 version,
                                 ndb_mgm_node_type node_type,
				 const char * _bindaddress,
                                 int timeout_ms) :
  m_end_session(true),
  m_version(version),
  m_node_type(node_type)
{
  DBUG_ENTER("ConfigRetriever::ConfigRetriever");
  DBUG_PRINT("enter", ("connect_string: '%s', force_nodeid: %d",
                       _connect_string, force_nodeid));
  DBUG_PRINT("enter", ("version: %d, node_type: %d, bind: %s, timeout: %d",
                       version, node_type,_bindaddress, timeout_ms));

  m_handle= ndb_mgm_create_handle();

  if (m_handle == 0) {
    setError(CR_ERROR, "Unable to allocate mgm handle");
    DBUG_VOID_RETURN;
  }

  ndb_mgm_set_timeout(m_handle, timeout_ms);

  if (ndb_mgm_set_connectstring(m_handle, _connect_string))
  {
    BaseString tmp(ndb_mgm_get_latest_error_msg(m_handle));
    tmp.append(" : ");
    tmp.append(ndb_mgm_get_latest_error_desc(m_handle));
    setError(CR_ERROR, tmp.c_str());
    DBUG_VOID_RETURN;
  }

  if (force_nodeid &&
      ndb_mgm_set_configuration_nodeid(m_handle, force_nodeid))
  {
    setError(CR_ERROR, "Failed to set forced nodeid");
    DBUG_VOID_RETURN;
  }

  if (_bindaddress)
  {
    if (ndb_mgm_set_bindaddress(m_handle, _bindaddress))
    {
      setError(CR_ERROR, ndb_mgm_get_latest_error_desc(m_handle));
      DBUG_VOID_RETURN;
    }
  }
  resetError();
  DBUG_VOID_RETURN;
}

ConfigRetriever::~ConfigRetriever()
{
  DBUG_ENTER("ConfigRetriever::~ConfigRetriever");
  if (m_handle) {
    if (ndb_mgm_is_connected(m_handle)) {
      if(m_end_session)
        ndb_mgm_end_session(m_handle);
      ndb_mgm_disconnect(m_handle);
    }
    ndb_mgm_destroy_handle(&m_handle);
  }
  DBUG_VOID_RETURN;
}

Uint32 
ConfigRetriever::get_configuration_nodeid() const
{
  return ndb_mgm_get_configuration_nodeid(m_handle);
}

Uint32 ConfigRetriever::get_mgmd_port() const
{
  return ndb_mgm_get_connected_port(m_handle);
}

const char *ConfigRetriever::get_mgmd_host() const
{
  return ndb_mgm_get_connected_host(m_handle);
}

const char *ConfigRetriever::get_connectstring(char *buf, int buf_sz) const
{
  return ndb_mgm_get_connectstring(m_handle, buf, buf_sz);
}

//****************************************************************************
//****************************************************************************
 
int
ConfigRetriever::do_connect(int no_retries,
			    int retry_delay_in_seconds, int verbose)
{
  return
    (ndb_mgm_connect(m_handle,no_retries,retry_delay_in_seconds,verbose)==0) ?
    0 : -1;
}

int
ConfigRetriever::disconnect()
{
  return ndb_mgm_disconnect(m_handle);
}

bool
ConfigRetriever::is_connected(void)
{
  return (ndb_mgm_is_connected(m_handle) != 0);
}

//****************************************************************************
//****************************************************************************
//****************************************************************************
//****************************************************************************
struct ndb_mgm_configuration*
ConfigRetriever::getConfig(Uint32 nodeid) {

  struct ndb_mgm_configuration * p = 0;

  if(m_handle != 0)
    p = getConfig(m_handle);

  if(p == 0)
    return 0;
  
  if(!verifyConfig(p, nodeid)){
    free(p);
    p= 0;
  }
  
  return p;
}

ndb_mgm_configuration *
ConfigRetriever::getConfig(NdbMgmHandle mgm_handle)
{
  const int from_node = 0;
  ndb_mgm_configuration * conf =
    ndb_mgm_get_configuration2(mgm_handle,
                               m_version,
                               m_node_type,
                               from_node);
  if(conf == 0)
  {
    BaseString tmp(ndb_mgm_get_latest_error_msg(mgm_handle));
    tmp.append(" : ");
    tmp.append(ndb_mgm_get_latest_error_desc(mgm_handle));
    setError(CR_ERROR, tmp.c_str());
    return 0;
  }
  return conf;
}

ndb_mgm_configuration *
ConfigRetriever::getConfig(const char * filename)
{
  if (access(filename, F_OK))
  {
    BaseString err;
    err.assfmt("Could not find file: '%s'", filename);
    setError(CR_ERROR, err);
    return 0;
  }

  FILE * f = fopen(filename, "rb");
  if(f == 0)
  {
    setError(CR_ERROR, "Failed to open file");
    return 0;
  }

  size_t read_sz;
  char read_buf[512];
  UtilBuffer config_buf;
  while ((read_sz = fread(read_buf, 1, sizeof(read_buf), f)) != 0)
  {
    if (config_buf.append(read_buf, read_sz) != 0)
    {
      setError(CR_ERROR, "Out of memory when appending read data");
      fclose(f);
      return 0;
    }
  }
  fclose(f);

  ConfigValuesFactory cvf;
  if(!cvf.unpack(config_buf))
  {
    setError(CR_ERROR,  "Error while unpacking");
    return 0;
  }
  return (ndb_mgm_configuration*)cvf.getConfigValues();
}

void
ConfigRetriever::setError(ErrorType et, const char * s){
  errorString.assign(s ? s : "");
  latestErrorType = et;
  DBUG_PRINT("info", ("latestErrorType: %u, '%s'",
                      latestErrorType, errorString.c_str()));
}

void
ConfigRetriever::setError(ErrorType et, BaseString err){
  setError(et, err.c_str());
}

void
ConfigRetriever::resetError(){
  setError(CR_NO_ERROR,0);
}

int
ConfigRetriever::hasError()
{
  return latestErrorType != CR_NO_ERROR;
}

const char * 
ConfigRetriever::getErrorString(){
  return errorString.c_str();
}


bool
ConfigRetriever::verifyConfig(const struct ndb_mgm_configuration * conf,
                              Uint32 nodeid)
{
  char buf[255];
  ndb_mgm_configuration_iterator it(* conf, CFG_SECTION_NODE);

  if(it.find(CFG_NODE_ID, nodeid)){
    BaseString::snprintf(buf, 255, "Unable to find node with id: %d", nodeid);
    setError(CR_ERROR, buf);
    return false;
  }

  const char * hostname;
  if(it.get(CFG_NODE_HOST, &hostname)){
    BaseString::snprintf(buf, 255, "Unable to get hostname(%d) from config",
                         CFG_NODE_HOST);
    setError(CR_ERROR, buf);
    return false;
  }

  if (hostname && hostname[0] != 0 &&
      !SocketServer::tryBind(0,hostname)) {
    BaseString::snprintf(buf, 255,
                         "The hostname this node should have according "
                         "to the configuration does not match a local "
                         "interface. Attempt to bind '%s' "
                         "failed with error: %d '%s'",
                         hostname, errno, strerror(errno));
    setError(CR_ERROR, buf);
    return false;
  }

  unsigned int _type;
  if(it.get(CFG_TYPE_OF_SECTION, &_type)){
    BaseString::snprintf(buf, 255, "Unable to get type of node(%d) from config",
                         CFG_TYPE_OF_SECTION);
    setError(CR_ERROR, buf);
    return false;
  }

  if(_type != (unsigned int)m_node_type){
    const char *type_s, *alias_s, *type_s2, *alias_s2;
    alias_s=
      ndb_mgm_get_node_type_alias_string((enum ndb_mgm_node_type)m_node_type,
                                         &type_s);
    alias_s2=
      ndb_mgm_get_node_type_alias_string((enum ndb_mgm_node_type)_type,
                                         &type_s2);
    BaseString::snprintf(buf, 255,
                         "This node type %s(%s) and config "
			 "node type %s(%s) don't match for nodeid %d",
			 alias_s, type_s, alias_s2, type_s2, nodeid);
    setError(CR_ERROR, buf);
    return false;
  }

  /**
   * Check hostnames
   */
  ndb_mgm_configuration_iterator iter(* conf, CFG_SECTION_CONNECTION);
  for(iter.first(); iter.valid(); iter.next()){

    Uint32 type = CONNECTION_TYPE_TCP + 1;
    if(iter.get(CFG_TYPE_OF_SECTION, &type)) continue;
    if(type != CONNECTION_TYPE_TCP) continue;
    
    Uint32 nodeId1, nodeId2, remoteNodeId;
    if(iter.get(CFG_CONNECTION_NODE_1, &nodeId1)) continue;
    if(iter.get(CFG_CONNECTION_NODE_2, &nodeId2)) continue;
    
    if(nodeId1 != nodeid && nodeId2 != nodeid) continue;
    remoteNodeId = (nodeid == nodeId1 ? nodeId2 : nodeId1);

    const char * name;
    struct in_addr addr;
    BaseString tmp;
    if(!iter.get(CFG_CONNECTION_HOSTNAME_1, &name) && strlen(name)){
      if(Ndb_getInAddr(&addr, name) != 0){
	tmp.assfmt("Unable to lookup/illegal hostname %s, "
		   "connection from node %d to node %d",
		   name, nodeid, remoteNodeId);
	setError(CR_ERROR, tmp.c_str());
	return false;
      }
    }

    if(!iter.get(CFG_CONNECTION_HOSTNAME_2, &name) && strlen(name)){
      if(Ndb_getInAddr(&addr, name) != 0){
	tmp.assfmt("Unable to lookup/illegal hostname %s, "
		   "connection from node %d to node %d",
		   name, nodeid, remoteNodeId);
	setError(CR_ERROR, tmp.c_str());
	return false;
      }
    }
  }

  return true;
}

int
ConfigRetriever::setNodeId(Uint32 nodeid)
{
  return ndb_mgm_set_configuration_nodeid(m_handle, nodeid);
}

Uint32
ConfigRetriever::allocNodeId(int no_retries, int retry_delay_in_seconds,
                             int verbose, int& error)
{
  if (!m_handle)
  {
    setError(CR_ERROR, "management server handle not initialized");
    return 0;  // Error
  }

  while (1)
  {
    if (ndb_mgm_is_connected(m_handle) == 1 ||
        ndb_mgm_connect(m_handle, 0, 0, verbose) == 0)
    {
      int res =
        ndb_mgm_alloc_nodeid(m_handle, m_version, m_node_type,
                             no_retries == 0 /* only log last retry */);
      if (res >= 0)
        return (Uint32)res; // Sucess!!
    }

    error = ndb_mgm_get_latest_error(m_handle);
    if (no_retries == 0 ||                        /* No more retries */
        error == NDB_MGM_ALLOCID_CONFIG_MISMATCH) /* Fatal error */
    {
      break;
    }
    no_retries--;
    NdbSleep_SecSleep(retry_delay_in_seconds);
  }
  BaseString tmp;
  tmp.assfmt("%s: %s",
             ndb_mgm_get_latest_error_msg(m_handle),
             ndb_mgm_get_latest_error_desc(m_handle));
  setError(CR_ERROR, tmp.c_str());
  return 0; // Error
}


Uint32
ConfigRetriever::allocNodeId(int no_retries, int retry_delay_in_seconds)
{
  int error;
  return allocNodeId(no_retries, retry_delay_in_seconds, 0, error);
}
