regen_ecostate_oracle.module

<?php

/**
 * @file
 * Code for Regen Ecostate Oracle
 */

/*
 * Implements hook_menu
 */
function regen_ecostate_oracle_menu() {

  // Default dashboard page.
  $items['farm/ecostate'] = array(
    'title' => 'Ecostate',
    'page callback' => 'regen_ecostate_oracle_dashboard_page',
    'access arguments' => array('access farm dashboard'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 100,
  );

  // View area contract details.
  $items['farm/ecostate/area/%'] = array(
    'title' => 'Contract Details',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('regen_ecostate_oracle_contract_form', 3),
    'access arguments' => array('access farm dashboard'),
  );

  // Select area to instantiate.
  $items['farm/ecostate/instantiate/area'] = array(
    'title' => 'Link/Instantiate',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('regen_ecostate_oracle_instantiate_area_form'),
    'access arguments' => array('access farm dashboard'),
    'type' => MENU_LOCAL_TASK,
  );

  // Instantiate new contract in area.
  $items['farm/ecostate/instantiate/area/%'] = array(
    'title' => 'Instantiate',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('regen_ecostate_oracle_instantiate_contract_form', 4),
    'access arguments' => array('access farm dashboard'),
  );

  // Ecostate dashboard.
  $items['farm/ecostate/dashboard'] = array(
    'title' => 'Dashboard',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -100,
  );

  // Oracle configuration form.
  $items['admin/config/farm/regen'] = array(
    'title' => 'Regen Oracle',
    'description' => 'Regen Network config settings.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('regen_ecostate_oracle_settings_form'),
    'access arguments' => array('access farm dashboard'),
  );

  return $items;
}

/**
 * Quick form page callback.
 */
function regen_ecostate_oracle_dashboard_page() {
  drupal_set_title(t('Ecostate'));

  $output = array();

  $output['map'] = farm_map_build('ecostate-dashboard-map', FALSE);

  $areas = farm_area_load_areas();

  $valid_areas = array();

  $contracts = variable_get('regen_ecostate_oracle_area_contracts', array());
  foreach($areas as $area) {
    if (!empty($contracts[$area->tid])) {
      $valid_areas[] = $area;
    }
  }

  $output['contracts'] = array(
    '#type' => 'fieldset',
    '#title' => 'Contracts',
    '#collapsible' => TRUE,
    '#collapsed' => FALSE
  );

  $contract_markup = '';

  foreach($valid_areas as $area) {
    $area_contract_link = l($area->name, 'farm/ecostate/area/'. $area->tid);
    $ecostate = regen_ecostate_oracle_get_current_ecostate($area->tid);
    $contract_markup = $contract_markup . '<li>'. $area_contract_link .' -  Current ecostate: <strong>' . $ecostate. '%</strong></li>';
  }

  $output['contracts']['created_contracts'] = array(
    '#markup' => $contract_markup,
    '#prefix' => '<ul>',
    '#suffix' => '</ul>'
  );

  $output['instructions'] = array(
    '#type' => 'fieldset',
    '#title' => 'Instructions',
  );

  $output['instructions']['select'] = array(
    '#markup' => '<h3>View Ecostate Contracts</h3>' .
      '<h5>Select an area on the map and click "Contract Details" OR choose an area from the list above to view the contract associated with that area</h5><br>',
  );

  $code_link = l('code #152', 'https://regen.wasm.glass/codes/152');
  $oracle_address = variable_get('regen_ecostate_oracle_address', '(not configred)');
  $contract_requirements_link = l('contract requirements', 'https://github.com/regen-network/testnets/tree/master/kontraua/challenges/phase-5#payout-contract-requirements');
  $add_area_link = l('Add an area', 'admin/structure/taxonomy/farm_areas/add', array('query'=> array('destination' => 'farm/ecostate/instantiate/area')));
  $instantiate_area_link = l('Instantiate area', 'farm/ecostate/instantiate/area');

  $output['instructions']['validator_steps'] = array(
    '#markup' => '<h3>Validator Steps</h3><br>'
  );

  $output['instructions']['link_contract'] = array(
    '#markup' => '<h4>1. Link Existing Contract</h4>' .
      '<p>Link a custom contract to an area and execute the "update_ecostate" message from the farmOS oracle. This simulates how a 3rd party might make ecostate claims against your contract.</p>' .
      '<strong>NOTE: Your contract must be instantiated with the oracle set to the account used by this farmOS server: "'. $oracle_address .'" or else attempts to execute messages on the contract will be denied.</strong>' .
      '<ul><li>' . $add_area_link . ' (Create a farmOS "Field" area. Please keep areas clustered in the same region so they remain visible on the map.)</li>' .
      '<li>' . $instantiate_area_link .' - Complete the "Link Contract" part of the form.</li></ul></p><br>',
  );

  $output['instructions']['update_ecostate'] = array(
    '#markup' => '<h4>2. Update Ecostate</h4>' .
      '<p><ul><li>Select "Contract Details" from an above area.</li>' .
      '<li>This page provides a form to update the ecostate value. After execution, the result will be saved in a farmOS Observation Log associated with the area.</li>' .
      '<li>This can be repeated until all tokens are released from a contract (or other criteria is met).</li></ul><br>',
  );

  $init_msg_schema = l('initMsg Schema', 'https://github.com/regen-network/ecodata-payout/blob/master/schema/init_msg.json');
  $output['instructions']['instantiate_contract'] = array(
    '#markup' => '<h4>Optional: Instantiate Contract</h4>' .
      '<p>This module instantiates ' . $code_link . ' by default. This contract implements a subset of features defined in the ' .$contract_requirements_link.'. You may also supply your custom "codeID" <strong>BUT your contract must be compatible with this ' . $init_msg_schema . '</strong>' .
      '<ul><li>' . $add_area_link . ' (Create a farmOS "Field" area. Please keep areas clustered in the same region so they remain visible on the map.)</li>' .
      '<li>' . $instantiate_area_link .' - This module instantiates code #152 by default. This contract implements a subset of features defined in the ' .$contract_requirements_link.'. You may supply a different code to test your custom contract.</li></ul></p><br>',
  );


  $kontraua_testnet_link = l('Kontraua Testnet', 'https://github.com/regen-network/testnets');
  $cosmwasm_js_link = l('cosmwasm-js', 'https://github.com/CosmWasm/cosmwasm-js');
  $testnet_explorer_link = l('explorer', 'https://explorer.regen.vitwit.com');

  $output['instructions']['links'] = array(
    '#markup' => '<h4>More info:</h4>' .
      '<ul><li>Info on the Regen Network '.$kontraua_testnet_link.'</li>'.
      '<li>This module uses '.$cosmwasm_js_link.' to communicate with cosmwasm contracts on the testnet.</li>'.
      '<li>Live testnet '.$testnet_explorer_link.'</li></ul>',
  );


  return $output;
}

/*
 * Implements hook_form()
 */
function regen_ecostate_oracle_contract_form($form, &$form_state, $area_id) {

  // Load area.
  $area = taxonomy_term_load($area_id);
  $area_details = farm_area_get_details($area_id);

  // Load area WKT.
  $area_ids = array();
  $area_ids[] = $area->tid;
  $wkt = farm_area_extract_geoms($area_ids)[0];

  // Save the area_id for form_submit.
  $form['area_id'] = array(
    '#type' => 'hidden',
    '#value' => $area_id,
  );

  // Display area info.
  $form['area_details'] = array(
    '#type' => 'fieldset',
    '#title' => 'farmOS Area Details',
    '#collapsible' => TRUE
  );

  $form['area_details']['area_map'] = array(
    '#type' => 'farm_map',
    '#map_name' => 'ecostate-contract-map',
    '#wkt' => $wkt,
    '#edit' => FALSE,
  );

  $form['area_details']['details'] = array(
    '#markup' => '<h3>Area Name:' . $area->name .'</h3><h5>Details:</h5><p>'.$area_details.'</p>'
  );

  // Load contract associated with area.
  $contracts = variable_get('regen_ecostate_oracle_area_contracts', array());
  $contract_address = null;
  if (!empty($contracts[$area_id])) {
    $contract = $contracts[$area_id];
    $contract_address = $contract['address'];

    $form['contract'] = array(
      '#type' => 'fieldset',
      '#title' => 'Contract',
    );

    $form['contract']['info'] = array(
      '#markup' => '<h4>Contact Address: <a href="https://regen.wasm.glass/contracts/' . $contract['address'].'">' . $contract['address'] . '</a></h4>' .
        '<div id="contract-label">Label: Loading...</div>' .
        '<div id="contract-codeId">Code ID: Loading...</div>' .
        '<div id="contract-creator">Creator: Loading...</div>' .
        '<div id="contract-ecostate">Ecostate: Loading...</div>' .
        '<div id="contract-initMsg">Ecostate: Loading...</div>' .
        '<div id="contract-state">State: Loading...</div>',
    );

    $form['contract']['info']['#attached']['js'][] = array(
      'type' => 'setting',
      'data' => array('regen_ecostate_oracle' => array('contract' => $contract_address)),
    );

    // Build a query to find observation logs in an area.
    $query = farm_quantity_log_query('ratio', 'ecostate', $done = TRUE, $type = 'farm_observation');
    $query->addTag('regen_ecostate_oracle_log_query');
    $query->join('field_data_field_farm_area', 'ss_fdffa', "ss_fdffa.entity_id = ss_log.id");
    $query->where('ss_fdffa.field_farm_area_tid = ' . $area_id);

    // Execute the query and gather the log ids.
    $result = $query->execute();
    $log_ids = array();
    foreach ($result as $row) {
      if (!empty($row->id)) {
        $log_ids[] = $row->id;
      }
    }

    // If there are log IDs, load the logs.
    $logs = array();
    if (!empty($log_ids)) {
      $logs = log_load_multiple($log_ids);
    }

    // Display logs.
    $form['log_fieldset'] = array(
      '#type' => 'fieldset',
      '#title' => 'Logs',
    );

    $form['log_fieldset']['logs'] = array();
    foreach ($logs as $log) {

      // Create a collapsible fieldset for this log.
      $form['log_fieldset']['logs'][$log->id] = array(
        '#type' => 'fieldset',
        '#title' => $log->name,
        '#collapsible' => TRUE,
      );

      // Load ecostate quantity data.
      $ecostate = farm_quantity_log_data($log, 'ratio', 'ecostate');

      $log_wrapper = entity_metadata_wrapper('log', $log);

      $log_data = NULL;
      if (!empty($log_wrapper->field_farm_data)) {
        $log_data = json_decode($log_wrapper->field_farm_data->value());
      }

      $tx = isset($log_data->transaction) ? $log_data->transaction : '';
      $response = isset($log_data->response) ? $log_data->response : '';

      $tx_url = 'https://regen.wasm.glass/transactions/' . $tx;
      $output = array(
        '#markup' => '<p>Log ID: ' . $log->id .' </p>' .
          '<p>Ecostate: ' . $ecostate[0]['value'] . ' %</p>' .
          '<p>Transaction: ' . l($tx, $tx_url) . '</p>' .
          '<p>Raw Response: </p><pre>' . json_encode($response) . '</pre>',
      );

      $form['log_fieldset']['logs'][$log->id]['info'] = $output;
    }

    // Create a new log.
    $form['log_fieldset']['logs']['new_log'] = array(
      '#type' => 'fieldset',
      '#title' => 'Update Ecostate',
      '#collapsible' => TRUE,
    );

    $form['log_fieldset']['logs']['new_log']['new_ecostate'] = array(
      '#type' => 'textfield',
      '#title' => 'Ecostate value',
      '#description' => 'A positive integer, which maintains the percentage of forest cover, without decimals. 56.16% is stored as 5616'
    );

    $form['log_fieldset']['logs']['new_log']['new_transaction'] = array(
      '#type' => 'hidden',
      '#default_value' => '',
    );

    $form['log_fieldset']['logs']['new_log']['status'] = array(
      '#type' => 'textfield',
      '#title' => 'Status',
      '#attributes' => array('readonly' => 'readonly'),
    );

    $form['log_fieldset']['logs']['new_log']['update_ecostate'] = array(
      '#type' => 'button',
      '#value' => 'Update Ecostate',
      '#id' => 'update-ecostate',
      '#attributes' => array('onclick' => 'return (false);'),
    );

    // Add behavior to update ecostate.
    $form['log_fieldset']['logs']['new_log']['update_ecostate']['#attached']['js'] = array(
      drupal_get_path('module', 'regen_ecostate_oracle') . '/js/update_ecostate.js',
    );

    $form['log_fieldset']['logs']['new_log']['submit'] = array(
      '#type' => 'submit',
      '#value' => 'Submit Log',
      '#id' => 'submit-ecostate',
      '#attributes' => array(
        'class' => array('element-invisible'),
      ),
    );

  }

  $config = array(
    'mnemonic' => variable_get('regen_ecostate_oracle_mnemonic', ''),
    'oracle' => variable_get('regen_ecostate_oracle_address', ''),
    'httpUrl' => variable_get('regen_ecostate_oracle_http_url', ''),
    'networkId' => variable_get('regen_ecostate_oracle_network_id', ''),
    'gasPrice' => variable_get('regen_ecostate_oracle_gas_price', ''),
  );

  drupal_add_js(array(
    'regen_ecostate_oracle' => array(
      'clientOpts' => $config,
    ),
  ), array('type' => 'setting'));

  drupal_add_js(drupal_get_path('module', 'regen_ecostate_oracle') . '/cosmwasm/dist/main.js', array('weight'=> -100));
  drupal_add_js(drupal_get_path('module', 'regen_ecostate_oracle') . '/js/load_contract.js', array('weight'=> -100));

  return $form;
}

/*
 * Implements hook_form_submit()
 */
function regen_ecostate_oracle_contract_form_submit($form, &$form_state) {
  $area = taxonomy_term_load($form_state['values']['area_id']);

  $ecostate = $form_state['values']['new_ecostate'];
  $tx = $form_state['values']['new_transaction'];

  regen_ecostate_oracle_create_ecostate_observation_log($area, $tx, $ecostate);
}


/*
 * Implements hook_form()
 */
function regen_ecostate_oracle_instantiate_area_form($form, &$form_state) {
  $areas = farm_area_load_areas();

  $valid_areas = array();

  $contracts = variable_get('regen_ecostate_oracle_area_contracts', array());
  foreach($areas as $area) {
    if (empty($contracts[$area->tid])) {
      $valid_areas[$area->tid] = $area->name;
    }
  }

  $form['area'] = array(
    '#type' => 'select',
    '#title' => 'Area',
    '#options' => $valid_areas,
    '#default_vale' => '',
    '#required' => TRUE,
  );

  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Submit',
  );

  return $form;
}

/*
 * Implements hook_form_submit()
 */
function regen_ecostate_oracle_instantiate_area_form_submit($form, &$form_state)  {
  $form_state['redirect'] = '/farm/ecostate/instantiate/area/' . $form_state['values']['area'];
}

/*
 * Implements hook_form()
 */
function regen_ecostate_oracle_instantiate_contract_form($form, &$form_state, $area_id) {

  drupal_set_title('Regen Ecostate');

  // Load area.
  $area = taxonomy_term_load($area_id);
  $area_details = farm_area_get_details($area_id);

  // Load area WKT.
  $area_ids = array();
  $area_ids[] = $area->tid;
  $wkt = farm_area_extract_geoms($area_ids)[0];

  // Save area_id for form_submit.
  $form['area_id'] = array(
    '#type' => 'hidden',
    '#value' => $area_id,
  );

  // Display area details.
  $form['area_details'] = array(
    '#type' => 'fieldset',
    '#title' => 'farmOS Area Details',
    '#collapsible' => TRUE
  );

  $form['area_details']['area_map'] = array(
    '#type' => 'farm_map',
    '#map_name' => 'ecostate-contract-map',
    '#wkt' => $wkt,
    '#edit' => FALSE,
  );

  $form['area_details']['details'] = array(
    '#markup' => '<h3>Area Name:' . $area->name .'</h3><h5>Details:</h5><p>'.$area_details.'</p>'
  );

  // Instantiate contract.
  $form['instantiate_contract'] = array(
    '#type' => 'fieldset',
    '#title' => 'Instantiate New Contract',
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );

  $form['instantiate_contract']['instantiate_code_id'] = array(
    '#type' => 'textfield',
    '#title' => 'Code ID',
    '#default_value' => '152',
  );

  $form['instantiate_contract']['instantiate_beneficiary'] = array(
    '#type' => 'textfield',
    '#title' => 'Beneficiary',
  );

  $form['instantiate_contract']['instantiate_total_tokens'] = array(
    '#type' => 'textfield',
    '#title' => 'Total Tokens',
  );

  $form['instantiate_contract']['instantiate_ecostate'] = array(
    '#type' => 'textfield',
    '#title' => 'Initial Ecostate',
    '#description' => 'A positive integer, which maintains the percentage of forest cover, without decimals. 56.16% is stored as 5616'
  );

  $form['instantiate_contract']['instantiate_region'] = array(
    '#type' => 'textfield',
    '#title' => 'Region',
    '#default_value' => $area->name,
    '#attributes' => array('readonly' => 'readonly'),
  );

  $form['instantiate_contract']['instantiate_label'] = array(
    '#type' => 'textfield',
    '#title' => 'Contract Label',
    '#default_value' => 'farmOS: ' . $area->name,
    '#attributes' => array('readonly' => 'readonly'),
  );

  $form['instantiate_contract']['instantiate_address'] = array(
    '#type' => 'hidden',
    '#default_value' => '',
  );

  $form['instantiate_contract']['instantiate_tx'] = array(
    '#type' => 'hidden',
    '#default_value' => '',
  );

  $form['instantiate_contract']['instantiate_status'] = array(
    '#type' => 'textfield',
    '#title' => 'Status',
    '#default_value' => '',
    '#attributes' => array('readonly' => 'readonly'),
  );

  $form['instantiate_contract']['instantiate_contract'] = array(
    '#type' => 'button',
    '#value' => 'Instantiate Contract',
    '#id' => 'instantiate-contract',
    '#attributes' => array('onclick' => 'return (false);'),
  );

  $form['instantiate_contract']['submit_contract'] = array(
    '#type' => 'submit',
    '#value' => 'submit contract',
    '#id' => 'submit-contract',
    '#attributes' => array(
      'class' => array('element-invisible'),
    ),
  );

  // Add option to link area to existing contract.
  $form['link_contract'] = array(
    '#type' => 'fieldset',
    '#title' => 'Link Existing Contract',
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );

  $form['link_contract']['link_contract_address'] = array(
    '#type' => 'textfield',
    '#title' => 'Contract Address',
    '#id' => 'link-contract-address',
  );

  $form['link_contract']['link_contract_submit'] = array(
    '#type' => 'submit',
    '#value' => 'Link contract',
    '#submit' => array('regen_ecostate_oracle_instantiate_contract_link_form_submit'),
  );

  $config = array(
    'mnemonic' => variable_get('regen_ecostate_oracle_mnemonic', ''),
    'oracle' => variable_get('regen_ecostate_oracle_address', ''),
    'httpUrl' => variable_get('regen_ecostate_oracle_http_url', ''),
    'networkId' => variable_get('regen_ecostate_oracle_network_id', ''),
    'gasPrice' => variable_get('regen_ecostate_oracle_gas_price', ''),
  );

  drupal_add_js(array(
    'regen_ecostate_oracle' => array(
      'clientOpts' => $config,
    ),
  ), array('type' => 'setting'));

  drupal_add_js(drupal_get_path('module', 'regen_ecostate_oracle') . '/cosmwasm/dist/main.js', array('weight' => -100));
  drupal_add_js(drupal_get_path('module', 'regen_ecostate_oracle') . '/js/instantiate_contract.js', array('weight'=> -100));
  return $form;
}

/*
 * Implements hook_form_submit().
 */
function regen_ecostate_oracle_instantiate_contract_form_submit($form, &$form_state) {
  $area_id = $form_state['values']['area_id'];
  $area = taxonomy_term_load($area_id);

  $address = $form_state['values']['instantiate_address'];

  $contracts = variable_get('regen_ecostate_oracle_area_contracts', array());
  $contracts[$area_id] = array('address'=> $address);
  variable_set('regen_ecostate_oracle_area_contracts', $contracts);

  $tx = $form_state['values']['instantiate_tx'];
  $ecostate = $form_state['values']['instantiate_ecostate'];

  regen_ecostate_oracle_create_ecostate_observation_log($area, $tx, $ecostate);

  $form_state['redirect'] = '/farm/ecostate/area/' . $area_id;
}

/*
 * Implements hook_form_submit().
 */
function regen_ecostate_oracle_instantiate_contract_link_form_submit($form, &$form_state) {
  $area_id = $form_state['values']['area_id'];
  $address = $form_state['values']['link_contract_address'];

  $contracts = variable_get('regen_ecostate_oracle_area_contracts', array());
  $contracts[$area_id] = array('address'=> $address);
  variable_set('regen_ecostate_oracle_area_contracts', $contracts);

  $form_state['redirect'] = '/farm/ecostate/area/' . $area_id;
}


/*
 * Helper function to create ecostate observation logs.
 */
function regen_ecostate_oracle_create_ecostate_observation_log($area, $tx, $ecostate) {
  $ecostate_percent = substr($ecostate, 0, strlen($ecostate) - 2) . '.' . substr($ecostate, -2);
  $measurements = array();
  $measurements[] = array(
    'measure' => 'ratio',
    'value' => $ecostate_percent,
    'units' => '%',
    'label' => 'ecostate',
  );

  // Set log name.
  $log_name = t('Update ' . $area->name . ' ecostate to ' . $ecostate_percent . '%');

  // Create a new farm quantity log.
  $log = farm_quantity_log_create('farm_observation', $log_name, REQUEST_TIME, TRUE, array(), $measurements);

  // Get the log entity wrapper.
  $log_wrapper = entity_metadata_wrapper('log', $log);

  // Add the area reference.
  $log_wrapper->field_farm_area[] = $area;

  $log_wrapper->field_farm_notes->value->set('<a href="https://regen.wasm.glass/transactions/' . $tx . '">' . $tx . '</a>');
  $log_wrapper->field_farm_notes->format->set('farm_format');

  $tx_data = json_decode($tx);

  $log_wrapper->field_farm_data->set(json_encode(array('response'=>$tx, 'transaction'=>$tx_data->transactionHash)));
  //$log_wrapper->field_farm_data->format->set('json');

  // Save the log (via its wrapper).
  $log_wrapper->save();

  return $log;
}

/*
 * Helper function to get current ecostate value from in an area.
 */
function regen_ecostate_oracle_get_current_ecostate($area_id) {

  // Build a query to find a log that references an asset.
  $query = farm_quantity_log_query('ratio', 'ecostate', $done = TRUE, $type = 'farm_observation');
  // Add a query tag to identify where this came from.
  $query->addTag('regen_ecostate_oracle_log_query');
  $query->join('field_data_field_farm_area', 'ss_fdffa', "ss_fdffa.entity_id = ss_log.id");
  $query->where('ss_fdffa.field_farm_area_tid = ' . $area_id);
  $query->range(0,1);

  // Execute the query and gather the log ids.
  $result = $query->execute();
  $log_ids = array();
  foreach ($result as $row) {
    if (!empty($row->id)) {
      $log_ids[] = $row->id;
    }
  }

  $ecostate = 'Not set.';
  if (!empty($log_ids)) {
    $log = log_load($log_ids[0]);

    $ecostate = farm_quantity_log_data($log, 'ratio', 'ecostate')[0]['value'];
  }

  return $ecostate;
}

/*
 * Implements hook_form()
 *
 * Settings for the regen oracle.
 */
function regen_ecostate_oracle_settings_form($form, &$form_state) {

  $form['regen_ecostate_oracle_http_url'] = array(
    '#type' => 'textfield',
    '#title' => 'Chain URL',
    '#description' => 'Blockchain URL',
    '#default_value' => variable_get('regen_ecostate_oracle_http_url', ''),
  );

  $form['regen_ecostate_oracle_network_id'] = array(
    '#type' => 'textfield',
    '#title' => 'Chain ID',
    '#description' => 'Chain ID',
    '#default_value' => variable_get('regen_ecostate_oracle_network_id', ''),
  );

  $form['regen_ecostate_oracle_gas_price'] = array(
    '#type' => 'textfield',
    '#title' => 'Gas Price',
    '#description' => 'Gas Price',
    '#default_value' => variable_get('regen_ecostate_oracle_gas_price', ''),
  );

  $form['regen_ecostate_oracle_address'] = array(
    '#type' => 'textfield',
    '#title' => 'Oracle Address',
    '#description' => 'Public key of Oracle account',
    '#default_value' => variable_get('regen_ecostate_oracle_address', ''),
    '#maxlength' => 255,
  );

  $form['regen_ecostate_oracle_mnemonic'] = array(
    '#type' => 'textfield',
    '#title' => 'Oracle mnemonic',
    '#description' => 'Used to generate the private key of oracle to sign txs',
    '#default_value' => variable_get('regen_ecostate_oracle_mnemonic', ''),
    '#maxlength' => 255,
  );

  return system_settings_form($form);
}