openhim-core/lib/metrics.js

The OpenHIM core application that provides logging and routing of http requests

var Transaction, logger;

Transaction = require('./model/transactions').Transaction;

logger = require('winston');

exports.calculateMetrics = function(startDate, endDate, transactionFilter, channelIDs, timeSeries, groupByChannels) {
  var group, match, pipeline;
  if (!(startDate instanceof Date) || !(endDate instanceof Date)) {
    return new Promise(function(resolve, reject) {
      return reject(new Error('startDate and endDate must be provided and be of type Date'));
    });
  }
  match = {
    "request.timestamp": {
      $lt: endDate,
      $gt: startDate
    }
  };
  if (transactionFilter) {
    Object.assign(match, transactionFilter);
  }
  if (channelIDs) {
    match.channelID = {
      $in: channelIDs
    };
  }
  group = {
    _id: {},
    total: {
      $sum: 1
    },
    avgResp: {
      $avg: {
        $subtract: ["$response.timestamp", "$request.timestamp"]
      }
    },
    minResp: {
      $min: {
        $subtract: ["$response.timestamp", "$request.timestamp"]
      }
    },
    maxResp: {
      $max: {
        $subtract: ["$response.timestamp", "$request.timestamp"]
      }
    },
    failed: {
      $sum: {
        $cond: [
          {
            $eq: ["$status", "Failed"]
          }, 1, 0
        ]
      }
    },
    successful: {
      $sum: {
        $cond: [
          {
            $eq: ["$status", "Successful"]
          }, 1, 0
        ]
      }
    },
    processing: {
      $sum: {
        $cond: [
          {
            $eq: ["$status", "Processing"]
          }, 1, 0
        ]
      }
    },
    completed: {
      $sum: {
        $cond: [
          {
            $eq: ["$status", "Completed"]
          }, 1, 0
        ]
      }
    },
    completedWErrors: {
      $sum: {
        $cond: [
          {
            $eq: ["$status", "Completed with error(s)"]
          }, 1, 0
        ]
      }
    }
  };
  if (groupByChannels) {
    group._id.channelID = '$channelID';
  }
  if (timeSeries) {
    switch (timeSeries) {
      case "minute":
        group._id.minute = {
          $minute: "$request.timestamp"
        };
        group._id.hour = {
          $hour: "$request.timestamp"
        };
        group._id.day = {
          $dayOfMonth: "$request.timestamp"
        };
        group._id.week = {
          $week: "$request.timestamp"
        };
        group._id.month = {
          $month: "$request.timestamp"
        };
        group._id.year = {
          $year: "$request.timestamp"
        };
        break;
      case "hour":
        group._id.hour = {
          $hour: "$request.timestamp"
        };
        group._id.week = {
          $week: "$request.timestamp"
        };
        group._id.day = {
          $dayOfMonth: "$request.timestamp"
        };
        group._id.month = {
          $month: "$request.timestamp"
        };
        group._id.year = {
          $year: "$request.timestamp"
        };
        break;
      case "day":
        group._id.day = {
          $dayOfMonth: "$request.timestamp"
        };
        group._id.week = {
          $week: "$request.timestamp"
        };
        group._id.month = {
          $month: "$request.timestamp"
        };
        group._id.year = {
          $year: "$request.timestamp"
        };
        break;
      case "week":
        group._id.week = {
          $week: "$request.timestamp"
        };
        group._id.month = {
          $month: "$request.timestamp"
        };
        group._id.year = {
          $year: "$request.timestamp"
        };
        break;
      case "month":
        group._id.month = {
          $month: "$request.timestamp"
        };
        group._id.year = {
          $year: "$request.timestamp"
        };
        break;
      case "year":
        group._id.year = {
          $year: "$request.timestamp"
        };
    }
  }
  pipeline = [
    {
      $match: match
    }, {
      $group: group
    }
  ];
  return Transaction.aggregate(pipeline).exec();
};

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