How to calculate Steem power

Hi friends,

In this tutorial I'll show you how to calculate the steem power of an account with actual values.

NodeJs modules required

• steem: Steem-JS official library. Official page
• wait.for: Wait.for will help in the async calls. Official page

To calculate the current steem power of an account, you need to get some data first. Get the account data for the account you want to calculate steem power. Get latest block and conversion info.

• steem.api.getAccounts
  Use this method to get the account data.
  

• steem.api.getDynamicGlobalProperties
  Get global data.
  

• steem.api.getBlockHeader
  

• steem.api.getRewardFund
  We need to know what is the current amount of steem funds to get an idea of the available stock and is required to get the total vests amount for the account.
  

• steem.api.getCurrentMedianHistoryPrice
  With this function we will get the current price to calculate vests for the account.
  

• steem.formatter.vestToSteem
  Use this to format total vest t a human readable number
  

Code should look similar to this

Code in text

const
  wait = require('wait.for'),
  steem = require('steem');

wait.launchFiber(function() {
  // Get account data
  var account = wait.for(
    steem.api.getAccounts,
    ['raserrano']
  );

  // Get global data
  var globalData = wait.for(
    steem.api.getDynamicGlobalProperties
  );

  // Get conversion information
  var ci = new Object();
  // Get latest head block
  var headBlock = wait.for(
    steem.api.getBlockHeader,
    globalData.head_block_number
  );

  ci.rewardfund_info = wait.for(
    steem.api.getRewardFund,
    'post'
  );

  ci.price_info = wait.for(
    steem.api.getCurrentMedianHistoryPrice
  );

  ci.reward_balance = ci.rewardfund_info.reward_balance;
  ci.recent_claims = ci.rewardfund_info.recent_claims;
  ci.reward_pool = ci.reward_balance.replace(' STEEM', '')
    / ci.recent_claims;

  ci.sbd_per_steem = ci.price_info.base.replace(' SBD', '')
    / ci.price_info.quote.replace(' STEEM', '');

  ci.steem_per_vest =
    globalData.total_vesting_fund_steem.replace(' STEEM', '')
    / globalData.total_vesting_shares.replace(' VESTS', '');

  var vp = account[0].voting_power;
  var vestingSharesParts = account[0].vesting_shares.split(' ');
  var receivedSharesParts = account[0].received_vesting_shares.split(' ');
  var delegatedSharesParts = account[0].delegated_vesting_shares.split(' ');
    var totalVests =
    parseFloat(vestingSharesParts[0]) + parseFloat(receivedSharesParts[0]) -
    parseFloat(delegatedSharesParts[0]);

  var steempower = steem.formatter.vestToSteem(
        totalVests,
        parseFloat(globalData.total_vesting_shares),
        parseFloat(globalData.total_vesting_fund_steem)
      );

  console.log('Total steem power is: ' + steempower);
  process.exit();
});

Results of executing the code:

You can compare the results with the Effective SP from: https://steemd.com/@raserrano
After processing the vesting shares, delegated and received,

You should be able to see the Effective SP

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Posted on Utopian.io - Rewarding Open Source Contributors

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