webui/components/TaskStatistics.vue

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<template>
  <el-card>
    <el-table
      v-if="columnArray.length !== 0"
      border
      :data="taskMetric"
      empty-text="No data">
      <el-table-column label="id" prop="id" sortable/>
      <el-table-column label="state" align="center">
        <template slot-scope="scope">
          <el-tag :type="toStateType(scope.row.stateTransitionEvents)">
            {{ toStateText(scope.row.stateTransitionEvents) }}
          </el-tag>
        </template>
      </el-table-column>
      <el-table-column
        v-for="col in columnArray"
        sortable
        :sort-method="(a, b) => _sortFunc(a, b, col)"
        :label="col"
        :key="col"
        :prop="col"/>
    </el-table>
    <p v-if="taskMetric.length !== 0">
      Duration sum: <b>{{taskMetric.map(t => t.duration).reduce((a, b) => a + b)}}</b>ms
    </p>
  </el-card>
</template>

<script>
import { STATE } from '../assets/constants';

export const EXCLUDE_COLUMN = [
  'id',
  'state',
  'group',
  'start',
  'end',
  'stateTransitionEvents',
  'content',
  'metricId',
];

const NOT_AVAILABLE = -1;

const _bytesToHumanReadable = function(bytes) {
  var i = bytes === 0 ? 0 :
    Math.floor(Math.log(bytes) / Math.log(1024));
  return (bytes / Math.pow(1024, i)).toFixed(2) * 1
    + ' ' + ['B', 'KB', 'MB', 'GB', 'TB'][i];
};

// this function will preprocess TaskMetric metric array.
const _preprocessMetric = function(metric) {
  let newMetric = Object.assign({}, metric);

  Object.keys(newMetric).forEach(key => {
    // replace NOT_AVAILBLE to 'N/A'
    if (newMetric[key] === NOT_AVAILABLE) {
      newMetric[key] = 'N/A';
    }

    if (newMetric[key] !== 'N/A' && key.toLowerCase().endsWith('bytes')) {
      newMetric[key] = _bytesToHumanReadable(newMetric[key]);
    }
  });

  if (newMetric.stateTransitionEvents) {
    const ste = newMetric.stateTransitionEvents;
    if (ste.length > 2) {
      const firstEvent = ste[0], lastEvent = ste[ste.length - 1];
      if (_isDoneTaskEvent(lastEvent)) {
        newMetric.duration = lastEvent.timestamp - firstEvent.timestamp;
      } else {
        newMetric.duration = 'N/A';
      }
    } else {
      newMetric.duration = 'N/A';
    }
  }

  return newMetric;
};

const _isDoneTaskEvent = function(event) {
  if (event.newState === STATE.COMPLETE
    || event.newState === STATE.FAILED) {
    return true;
  }
  return false;
};

export default {
  props: ['metricLookupMap'],

  //COMPUTED
  computed: {
    /**
     * Computed property which consists table data.
     */
    taskMetric() {
      return Object.keys(this.metricLookupMap)
        .filter(key => this.metricLookupMap[key].group === 'TaskMetric')
        .map(key => _preprocessMetric(this.metricLookupMap[key]));
    },

    /**
     * Computed property of column string array.
     * This property will look first element of `taskMetric` array and
     * extract object keys and filter by EXECLUDE_COLUMN.
     */
    columnArray() {
      if (!this.taskMetric[0]) {
        return [];
      }

      return Object.keys(this.taskMetric[0])
        .filter(k => !EXCLUDE_COLUMN.includes(k));
    },
  },

  //METHODS
  methods: {
    _sortFunc(_a, _b, column) {
      let a = _a[column], b = _b[column];
      if (a === 'N/A') {
        return -1;
      } else if (b === 'N/A') {
        return 1;
      } else if (a === b) {
        return 0;
      } else if (a > b) {
        return 1;
      } else if (a < b) {
        return -1;
      }
      return 0;
    },

    /**
     * Fetch last stateTransitionEvents element and extract
     * newState property. See STATE constant.
     * @returns newState of last stateTransitionEvents array
     */
    toStateText(e) {
      return e[e.length - 1].newState;
    },

    /**
     * Helper function for converting state to element-ui type string.
     * @param e state.
     * @returns element-ui type string.
     */
    toStateType(e) {
      let t = this.toStateText(e);
      switch (t) {
        case STATE.READY:
        case STATE.INCOMPLETE:
          return 'info';
        case STATE.EXECUTING:
          return '';
        case STATE.COMPLETE:
          return 'success';
        case STATE.FAILED:
          return 'danger';
        case STATE.ON_HOLD:
        case STATE.SHOULD_RETRY:
          return 'warning';
        default:
          return '';
      }
    }
  },


}
</script>