sensorconfig.cpp 38.6 KB
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//================================================================================
// Name        : sensorconfig.cpp
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// Author      : Axel Auweter, Daniele Tafani
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// Copyright   : Leibniz Supercomputing Centre
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// Description : C++ API implementation for configuring libdcdb public sensors.
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//================================================================================

//================================================================================
// This file is part of DCDB (DataCenter DataBase)
// Copyright (C) 2011-2016 Leibniz Supercomputing Centre
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//================================================================================
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#include <cstring>
#include <iostream>
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#include <algorithm>
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#include <string>
#include <list>
#include <unordered_set>
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#include <utility>
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#include "cassandra.h"

#include "sensorconfig_internal.h"
#include "dcdbglobals.h"
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#include "dcdbendian.h"
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#include "dcdb/virtualsensor.h"
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using namespace DCDB;

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/*
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 * PublicSensor functions.
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 */
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PublicSensor::PublicSensor()
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{
  name = "";
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  is_virtual = false;
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  pattern = "";
  scaling_factor = 1.0;
  unit = "";
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  sensor_mask = 0;
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  expression = "";
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  v_sensorid = "";
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  t_zero = 0;
  frequency = 0;
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}

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PublicSensor::PublicSensor (const PublicSensor &copy)
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{
  name = copy.name;
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  is_virtual = copy.is_virtual;
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  pattern = copy.pattern;
  scaling_factor = copy.scaling_factor;
  unit = copy.unit;
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  sensor_mask = copy.sensor_mask;
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  expression = copy.expression;
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  v_sensorid = copy.v_sensorid;
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  t_zero = copy.t_zero;
  frequency = copy.frequency;
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}


/*
 * SensorConfig functions
 */
SCError SensorConfig::publishSensor(const char* publicName, const char* sensorPattern)
{
  return impl->publishSensor(publicName, sensorPattern);
}

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SCError SensorConfig::publishVirtualSensor(const char* publicName, const char* vSensorExpression, const char* vSensorId, TimeStamp tZero, uint64_t frequency)
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{
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  return impl->publishVirtualSensor(publicName, vSensorExpression, vSensorId, tZero, frequency);
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}

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SCError SensorConfig::unPublishSensor(const char* publicName)
{
  return impl->unPublishSensor(publicName);
}

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SCError SensorConfig::getPublicSensorNames(std::list<std::string>& publicSensors)
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{
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  return impl->getPublicSensorNames(publicSensors);
}

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SCError SensorConfig::getPublicSensorsVerbose(std::list<PublicSensor>& publicSensors)
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{
  return impl->getPublicSensorsVerbose(publicSensors);
}

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SCError SensorConfig::getPublicSensorByName(PublicSensor& sensor, const char* publicName)
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{
  return impl->getPublicSensorByName(sensor, publicName);
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}

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SCError SensorConfig::isVirtual(bool& isVirtual, std::string publicName)
{
  return impl->isVirtual(isVirtual, publicName);
}

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SCError SensorConfig::getSensorPattern(std::string& pattern, std::string publicName)
{
  return impl->getSensorPattern(pattern, publicName);
}

SCError SensorConfig::getSensorListForPattern(std::list<SensorId>& sensorIds, std::string pattern)
{
  return impl->getSensorListForPattern(sensorIds, pattern);
}

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SCError SensorConfig::getSensorListForPattern(std::list<SensorId>& sensorIds, std::string pattern, TimeStamp start, TimeStamp end)
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{
  return impl->getSensorListForPattern(sensorIds, pattern, start, end);
}

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SCError SensorConfig::setSensorScalingFactor(std::string publicName, double scalingFactor) {
  return impl->setSensorScalingFactor(publicName, scalingFactor);
}

SCError SensorConfig::setSensorUnit(std::string publicName, std::string unit)
{
  return impl->setSensorUnit(publicName, unit);
}

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SCError SensorConfig::setSensorMask(std::string publicName, uint64_t mask)
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{
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  return impl->setSensorMask(publicName, mask);
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}

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SCError SensorConfig::setVirtualSensorExpression(std::string publicName, std::string expression)
{
  return impl->setVirtualSensorExpression(publicName, expression);
}

SCError SensorConfig::setVirtualSensorTZero(std::string publicName, TimeStamp tZero)
{
  return impl->setVirtualSensorTZero(publicName, tZero);
}

SCError SensorConfig::setVirtualSensorFrequency(std::string publicName, uint64_t frequency)
{
  return impl->setVirtualSensorFrequency(publicName, frequency);
}

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SensorConfig::SensorConfig(Connection* conn)
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{
  /* Allocate impl object */
  impl = new SensorConfigImpl(conn);
}

SensorConfig::~SensorConfig()
{
  if (impl) {
      delete impl;
  }
}

/*
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 * SensorConfigImpl protected members and functions
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 */
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SensorConfigImpl::SensorPropertyCache_t SensorConfigImpl::sensorPropertyCache;
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/*
 * Validate the pattern for a Sensor to be published
 * Patterns may only consist of hex numbers and forward slashes
 * and at most one wildcard character (*). Also, the total number of
 * bits may not exceed 128.
 */
bool SensorConfigImpl::validateSensorPattern(const char* sensorPattern)
{
  unsigned int wildcards, bits;

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  /* 112 bits in HEX is at most 28 characters. Considering forward-slash separators, 56 is a reasonable maxmimum string length */
  if (strlen(sensorPattern) > 56) {
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      return false;
  }

  /* Iterate through the string and validate/count the characters */
  bits = 0;
  wildcards = 0;
  for (unsigned int c = 0; c < strlen(sensorPattern); c++) {
      switch (sensorPattern[c]) {

      /* Regular HEX digit */
      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
      case '8':
      case '9':
      case 'a':
      case 'A':
      case 'b':
      case 'B':
      case 'c':
      case 'C':
      case 'd':
      case 'D':
      case 'e':
      case 'E':
      case 'f':
      case 'F':
        bits += 4;
        break;

      /* Wildcard */
      case '*':
        wildcards++;
        break;

      /* Forward slash */
      case '/':
        break;

      /* Everything else is not allowed */
      default:
        return false;
      }
  }

  /* More than one wildcard is not allowed */
  if (wildcards > 1)
    return false;

  /* In case of a wildcard, there should be some bits left for the wildcard to fill in */
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  if (wildcards == 1 && bits >= 112)
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    return false;

  /* Looks good */
  return true;
}

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/*
 * Validate the public name of a sensor.
 * Sensor public names may not contain forward slash characters.
 */
bool SensorConfigImpl::validateSensorPublicName(std::string publicName)
{
  return (publicName.find("/") == std::string::npos);
}
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/*
 * SensorConfigImpl public functions
 */
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SCError SensorConfigImpl::publishSensor(std::string publicName, std::string sensorPattern)
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{
  /* Check if the pattern matches the requirements */
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  if (!validateSensorPattern(sensorPattern.c_str())) {
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      return SC_INVALIDPATTERN;
  }

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  /* Check if the publicName is valid */
  if (!validateSensorPublicName(publicName.c_str())) {
      return SC_INVALIDPUBLICNAME;
  }

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  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

  /* Insert the entry */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
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  const char* query = "INSERT INTO " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " (name, pattern, virtual) VALUES (?,?, FALSE);";
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  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
    cass_future_free(future);
    return SC_UNKNOWNERROR;
  } else {
    prepared = cass_future_get_prepared(future);
  }

  cass_future_free(future);

  statement = cass_prepared_bind(prepared);

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  cass_statement_bind_string_by_name(statement, "name", publicName.c_str());
  cass_statement_bind_string_by_name(statement, "pattern", sensorPattern.c_str());
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  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
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    cass_prepared_free(prepared);
    cass_future_free(future);
    cass_statement_free(statement);

    return SC_UNKNOWNERROR;
  }

  cass_prepared_free(prepared);
  cass_future_free(future);
  cass_statement_free(statement);

  return SC_OK;
}

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SCError SensorConfigImpl::publishVirtualSensor(std::string publicName, std::string vSensorExpression, std::string vSensorId, TimeStamp tZero, uint64_t frequency)
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{
  /* Check if the publicName is valid */
  if (!validateSensorPublicName(publicName.c_str())) {
      return SC_INVALIDPUBLICNAME;
  }

  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

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  /* Validate vSensorExpression */
  try {
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      VSensorExpression vsExp(connection, vSensorExpression);

      /* Check that it is not recursive-pointing to itself */
      std::unordered_set<std::string> inputSet;
      vsExp.getInputsRecursive(inputSet);
      std::unordered_set<std::string>::const_iterator found = inputSet.find(publicName);
      if (found != inputSet.end()) {
          return SC_EXPRESSIONSELFREF;
      }
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  }
  catch (std::exception& e) {
      std::cout << e.what();
      return SC_INVALIDEXPRESSION;
  }
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  /* Check if the vSensorId is valid */
  SensorId vSensor;
  if (!vSensor.mqttTopicConvert(vSensorId)) {
      return SC_INVALIDVSENSORID;
  }
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  /* Insert the entry */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
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  const char* query = "INSERT INTO " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " (name, expression, vsensorid, tzero, frequency, virtual) VALUES (?,?,?,?,?,TRUE);";
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  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
    cass_future_free(future);
    return SC_UNKNOWNERROR;
  } else {
    prepared = cass_future_get_prepared(future);
  }

  cass_future_free(future);

  statement = cass_prepared_bind(prepared);

  cass_statement_bind_string_by_name(statement, "name", publicName.c_str());
  cass_statement_bind_string_by_name(statement, "expression", vSensorExpression.c_str());
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  cass_statement_bind_string_by_name(statement, "vsensorid", vSensorId.c_str());
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  cass_statement_bind_int64_by_name(statement, "tzero", tZero.getRaw());
  cass_statement_bind_int64_by_name(statement, "frequency", frequency);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);

    cass_prepared_free(prepared);
    cass_future_free(future);
    cass_statement_free(statement);

    return SC_UNKNOWNERROR;
  }

  cass_prepared_free(prepared);
  cass_future_free(future);
  cass_statement_free(statement);

  return SC_OK;
}


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SCError SensorConfigImpl::unPublishSensor(std::string publicName)
{
  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

  /* Remove the entry */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
  const char* query = "DELETE FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " WHERE name = ? ;";

  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
    cass_future_free(future);
    return SC_UNKNOWNERROR;
  } else {
    prepared = cass_future_get_prepared(future);
  }

  cass_future_free(future);

  statement = cass_prepared_bind(prepared);

  cass_statement_bind_string_by_name(statement, "name", publicName.c_str());

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
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    cass_prepared_free(prepared);
    cass_future_free(future);
    cass_statement_free(statement);

    return SC_UNKNOWNERROR;
  }

  cass_prepared_free(prepared);
  cass_future_free(future);
  cass_statement_free(statement);

  return SC_OK;
}

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SCError SensorConfigImpl::getPublicSensorNames(std::list<std::string>& publicSensors)
{
  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

  /* Clear the list */
  publicSensors.clear();

  /* Fill the list with all public sensors */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const char* query = "SELECT name FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " ;";

  statement = cass_statement_new(query, 0);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
     connection->printError(future);
     cass_future_free(future);
     cass_statement_free(statement);
     return SC_UNKNOWNERROR;
  } else {
      const CassResult* result = cass_future_get_result(future);
      CassIterator* iterator = cass_iterator_from_result(result);

      while (cass_iterator_next(iterator)) {
          const char* name;
          size_t      name_len;

          const CassRow* row = cass_iterator_get_row(iterator);

          if (cass_value_get_string(cass_row_get_column_by_name(row, "name"), &name, &name_len) != CASS_OK) {
              name = ""; name_len = 0;
          }

          publicSensors.push_back(std::string(name, name_len));
      }
      cass_result_free(result);
      cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);
  return SC_OK;
}

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SCError SensorConfigImpl::getPublicSensorsVerbose(std::list<PublicSensor>& publicSensors)
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{
  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

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  /* Clear the list */
  publicSensors.clear();

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  /* Fill the list with all public sensors */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
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  const char* query = "SELECT * FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " ;";
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  statement = cass_statement_new(query, 0);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
     connection->printError(future);
     cass_future_free(future);
     cass_statement_free(statement);
     return SC_UNKNOWNERROR;
  } else {
      const CassResult* result = cass_future_get_result(future);
      CassIterator* iterator = cass_iterator_from_result(result);

      while (cass_iterator_next(iterator)) {
          const char* name;
          size_t      name_len;
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          cass_bool_t is_virtual;
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          const char* pattern;
          size_t      pattern_len;
          double      scaling_factor;
          const char* unit;
          size_t      unit_len;
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          int64_t     sensor_mask;
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          const char* expression;
          size_t      expression_len;
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          const char* vsensorid;
          size_t      vsensorid_len;
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          int64_t     tzero;
          int64_t     frequency;
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          PublicSensor sensor;
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          const CassRow* row = cass_iterator_get_row(iterator);

          if (cass_value_get_string(cass_row_get_column_by_name(row, "name"), &name, &name_len) != CASS_OK) {
              name = ""; name_len = 0;
          }
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          if (cass_value_get_bool(cass_row_get_column_by_name(row, "virtual"), &is_virtual) != CASS_OK) {
              is_virtual = cass_false;
          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "pattern"), &pattern, &pattern_len) != CASS_OK) {
              pattern = ""; pattern_len = 0;
          }
          if (cass_value_get_double(cass_row_get_column_by_name(row, "scaling_factor"), &scaling_factor) != CASS_OK) {
              scaling_factor = 1.0;
          }
          if (cass_value_get_string(cass_row_get_column_by_name(row, "unit"), &unit, &unit_len) != CASS_OK) {
              unit = ""; unit_len = 0;
          }
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          if (cass_value_get_int64(cass_row_get_column_by_name(row, "sensor_mask"), &sensor_mask) != CASS_OK) {
              sensor_mask = 0;
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          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "expression"), &expression, &expression_len) != CASS_OK) {
              expression = ""; expression_len = 0;
          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "vsensorid"), &vsensorid, &vsensorid_len) != CASS_OK) {
              vsensorid = ""; vsensorid_len = 0;
          }
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          if (cass_value_get_int64(cass_row_get_column_by_name(row, "tzero"), &tzero) != CASS_OK) {
              tzero = 0;
          }
          if (cass_value_get_int64(cass_row_get_column_by_name(row, "frequency"), &frequency) != CASS_OK) {
              frequency = 0;
          }
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          sensor.name = std::string(name, name_len);
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          sensor.is_virtual = is_virtual == cass_true ? true : false;
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          sensor.pattern = std::string(pattern, pattern_len);
          sensor.scaling_factor = scaling_factor;
          sensor.unit = std::string(unit, unit_len);
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          sensor.sensor_mask = sensor_mask;
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          sensor.expression = std::string(expression, expression_len);
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          sensor.v_sensorid = std::string(vsensorid, vsensorid_len);
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          sensor.t_zero = tzero;
          sensor.frequency = frequency;
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          publicSensors.push_back(sensor);
      }
      cass_result_free(result);
      cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);
  return SC_OK;
}

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SCError SensorConfigImpl::getPublicSensorByName(PublicSensor& sensor, const char* publicName)
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{
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  /* Check if the sensor definition is already in the cache */
  SensorPropertyCache_t::const_iterator got = sensorPropertyCache.find(publicName);
  if (got != sensorPropertyCache.end()) {
      sensor = got->second;
      return SC_OK;
  }

  /* Not in cache - query the data base */
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  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

  /* Fill the list with all public sensors */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
  const char* query = "SELECT * FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " WHERE name = ?;";

  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
      cass_future_free(future);
      return SC_UNKNOWNERROR;
  } else {
      prepared = cass_future_get_prepared(future);
  }
  cass_future_free(future);

  statement = cass_prepared_bind(prepared);
  cass_statement_bind_string_by_name(statement, "name", publicName);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
     connection->printError(future);
     cass_future_free(future);
     cass_statement_free(statement);
     return SC_UNKNOWNERROR;
  } else {
      const CassResult* result = cass_future_get_result(future);
      CassIterator* iterator = cass_iterator_from_result(result);

      if (cass_iterator_next(iterator)) {
          const char* name;
          size_t      name_len;
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          cass_bool_t is_virtual;
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          const char* pattern;
          size_t      pattern_len;
          double      scaling_factor;
          const char* unit;
          size_t      unit_len;
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          int64_t     sensor_mask;
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          const char* expression;
          size_t      expression_len;
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          const char* vsensorid;
          size_t      vsensorid_len;
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          int64_t     tzero;
          int64_t     frequency;
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          const CassRow* row = cass_iterator_get_row(iterator);

          if (cass_value_get_string(cass_row_get_column_by_name(row, "name"), &name, &name_len) != CASS_OK) {
              name = ""; name_len = 0;
          }
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          if (cass_value_get_bool(cass_row_get_column_by_name(row, "virtual"), &is_virtual) != CASS_OK) {
              is_virtual = cass_false;
          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "pattern"), &pattern, &pattern_len) != CASS_OK) {
              pattern = ""; pattern_len = 0;
          }
          if (cass_value_get_double(cass_row_get_column_by_name(row, "scaling_factor"), &scaling_factor) != CASS_OK) {
              scaling_factor = 1.0;
          }
          if (cass_value_get_string(cass_row_get_column_by_name(row, "unit"), &unit, &unit_len) != CASS_OK) {
              unit = ""; unit_len = 0;
          }
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          if (cass_value_get_int64(cass_row_get_column_by_name(row, "sensor_mask"), &sensor_mask) != CASS_OK) {
              sensor_mask = 0;
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          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "expression"), &expression, &expression_len) != CASS_OK) {
              expression = ""; expression_len = 0;
          }
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          if (cass_value_get_string(cass_row_get_column_by_name(row, "vsensorid"), &vsensorid, &vsensorid_len) != CASS_OK) {
              vsensorid = ""; vsensorid_len = 0;
          }
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          if (cass_value_get_int64(cass_row_get_column_by_name(row, "tzero"), &tzero) != CASS_OK) {
              tzero = 0;
          }
          if (cass_value_get_int64(cass_row_get_column_by_name(row, "frequency"), &frequency) != CASS_OK) {
              frequency = 0;
          }
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          sensor.name = std::string(name, name_len);
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          sensor.is_virtual = is_virtual == cass_true ? true : false;
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          sensor.pattern = std::string(pattern, pattern_len);
          sensor.scaling_factor = scaling_factor;
          sensor.unit = std::string(unit, unit_len);
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          sensor.sensor_mask = sensor_mask;
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          sensor.expression = std::string(expression, expression_len);
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          sensor.v_sensorid = std::string(vsensorid, vsensorid_len);
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          sensor.t_zero = tzero;
          sensor.frequency = frequency;

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          /* Add to sensorPropertyCache for later use */
          sensorPropertyCache.insert(std::make_pair(publicName, sensor));
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      }
      else {
          cass_result_free(result);
          cass_iterator_free(iterator);
          cass_future_free(future);
          cass_statement_free(statement);

          return SC_UNKNOWNSENSOR;
      }
      cass_result_free(result);
      cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);
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  cass_prepared_free(prepared);
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  return SC_OK;
}

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SCError SensorConfigImpl::isVirtual(bool& isVirtual, std::string publicName)
{
  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

  /* Read the virtual field from the database */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
  const char* query = "SELECT virtual FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " WHERE name = ? ;";

  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
      cass_future_free(future);
      return SC_UNKNOWNERROR;
  } else {
      prepared = cass_future_get_prepared(future);
  }
  cass_future_free(future);

  statement = cass_prepared_bind(prepared);
  cass_statement_bind_string_by_name(statement, "name", publicName.c_str());

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
  } else {
      const CassResult* result = cass_future_get_result(future);
      CassIterator* iterator = cass_iterator_from_result(result);

      if (cass_iterator_next(iterator)) {
          cass_bool_t isVirtual_;
          const CassRow* row = cass_iterator_get_row(iterator);
          cass_value_get_bool(cass_row_get_column_by_name(row, "virtual"), &isVirtual_);
          isVirtual = isVirtual_ ? true : false;
      }
      else {
          return SC_UNKNOWNSENSOR;
      }

      cass_result_free(result);
      cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);
  cass_prepared_free(prepared);
  return SC_OK;
}

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SCError SensorConfigImpl::getSensorPattern(std::string& pattern, std::string publicName)
{
  /* Check if the session is valid */
  if (!session) {
      return SC_INVALIDSESSION;
  }

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  /* Ensure that the public sensor is not virtual */
  bool virt;
  SCError err = isVirtual(virt, publicName);
  if (err != SC_OK) {
      return err;
  }
  if (virt) {
      return SC_WRONGTYPE;
  }

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  /* Read the Pattern string from the database */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
  const char* query = "SELECT pattern FROM " CONFIG_KEYSPACE_NAME "." CF_PUBLISHEDSENSORS " WHERE name = ? ;";

  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
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      cass_future_free(future);
      return SC_UNKNOWNERROR;
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  } else {
      prepared = cass_future_get_prepared(future);
  }
  cass_future_free(future);

  statement = cass_prepared_bind(prepared);
  cass_statement_bind_string_by_name(statement, "name", publicName.c_str());

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
  } else {
      const CassResult* result = cass_future_get_result(future);
      CassIterator* iterator = cass_iterator_from_result(result);

      if (cass_iterator_next(iterator)) {
          const char* pattern_cstr;
          size_t      pattern_len;
          const CassRow* row = cass_iterator_get_row(iterator);
          cass_value_get_string(cass_row_get_column_by_name(row, "pattern"), &pattern_cstr, &pattern_len);
          pattern = std::string(pattern_cstr, pattern_len);
      }
      else {
          return SC_UNKNOWNSENSOR;
      }

      cass_result_free(result);
      cass_iterator_free(iterator);
  }

  cass_future_free(future);
  cass_statement_free(statement);
  cass_prepared_free(prepared);
  return SC_OK;
}

SCError SensorConfigImpl::getSensorListForPattern(std::list<SensorId>& sensorIds, std::string pattern)
{
  /* Tiny hack to call the long version of this function */
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  TimeStamp start((uint64_t)0x0);
  TimeStamp end((uint64_t)0x260DD31906D70000);
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  return getSensorListForPattern(sensorIds, pattern, start, end);
}

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SCError SensorConfigImpl::getSensorListForPattern(std::list<SensorId>& sensorIds, std::string pattern, TimeStamp start, TimeStamp end)
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{
  /* Clear the list of sensorIds */
  sensorIds.clear();

  /* Strip all slashes from publishedSensorName */
  pattern.erase(std::remove(pattern.begin(), pattern.end(), '/'), pattern.end());

  /* Calculate lower and upper boundaries for the expansion of the pattern */
  std::string low  = pattern;
  std::string high = pattern;
  if (pattern.find("*") != std::string::npos) {
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      low.replace(pattern.find("*"), 1, 29-pattern.length(), '0');
      high.replace(pattern.find("*"), 1, 29-pattern.length(), 'F');
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  }

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  /* The week stamp is imprinted on the lower 4 bits */
  low.append("0000");
  high.append("FFFF");
	
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  SensorId lowId, highId;
  if (!lowId.mqttTopicConvert(low)) {
      return SC_INVALIDPATTERN;
  }
  if (!highId.mqttTopicConvert(high)) {
      return SC_INVALIDPATTERN;
  }
  lowId.setRsvd(start.getWeekstamp());
  highId.setRsvd(end.getWeekstamp());

  low = lowId.serialize();
  high = highId.serialize();

//  std::cout << "Lower boundary for sensor scan: " << std::hex << std::setfill('0') << std::setw(16) << lowId.raw[0] << " " << std::hex << std::setfill('0') << std::setw(16) << lowId.raw[1] << std::endl;
//  std::cout << "Upper boundary for sensor scan: " << std::hex << std::setfill('0') << std::setw(16) << highId.raw[0] << " " << std::hex << std::setfill('0') << std::setw(16) << highId.raw[1] << std::endl;

  /* Query the database to see which raw sensors actually exist in the interval between low and high */
  CassError rc = CASS_OK;
  CassStatement* statement = nullptr;
  CassFuture* future = nullptr;
  const CassPrepared* prepared = nullptr;
  const char* query = "SELECT DISTINCT sid FROM " KEYSPACE_NAME "." CF_SENSORDATA " WHERE TOKEN(sid) >= ? and TOKEN(sid) <= ?;";

  future = cass_session_prepare(session, query);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    connection->printError(future);
    return SC_UNKNOWNERROR;
  }

  prepared = cass_future_get_prepared(future);
  cass_future_free(future);

  statement = cass_prepared_bind(prepared);

  cass_statement_bind_bytes(statement, 0, (const cass_byte_t*)(low.c_str()), 16);
  cass_statement_bind_bytes(statement, 1, (const cass_byte_t*)(high.c_str()), 16);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
      connection->printError(future);
      return SC_UNKNOWNERROR;
  }

  const CassResult* result = cass_future_get_result(future);
  cass_future_free(future);

  CassIterator* iterator = cass_iterator_from_result(result);
  while (cass_iterator_next(iterator)) {
      const CassRow* row = cass_iterator_get_row(iterator);
      const cass_byte_t* res;
      size_t       res_len;
      cass_value_get_bytes(cass_row_get_column_by_name(row, "sid"), &res, &res_len);

      uint64_t raw[2];
      raw[0] = Endian::BEToHost(((uint64_t*)res)[0]);
      raw[1] = Endian::BEToHost(((uint64_t*)res)[1]);

      SensorId sensor;
      sensor.setRaw(raw);

      /* Check if the sensorId matches the pattern and append to result */
      if (sensor.patternMatch(pattern)) {
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          /* Only append if within the weekstamp window */
          if ((sensor.getRsvd() >= start.getWeekstamp()) && (sensor.getRsvd() <= end.getWeekstamp())) {
              sensorIds.push_back(sensor);
          }
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      }
  }
  cass_result_free(result);
  cass_iterator_free(iterator);
  cass_statement_free(statement);
  cass_prepared_free(prepared);

  return SC_OK;
}

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SCError SensorConfigImpl::setSensorScalingFactor(std::string publicName, double scalingFactor)
{
  SCError error = SC_UNKNOWNERROR;

  /* Check the sensorconfig whether the given public sensor has the integrable flag set to true */