Apollo Link Average Query Time

Installation

yarn add apollo-link-average-query-time

Usage

import { ApolloLink } from 'apollo-link';
import { InMemoryCache } from 'apollo-cache-inmemory';
import AverageQueryTimeLink from 'apollo-link-average-query-time';

const averageQueryTimeLink = new AverageQueryTimeLink({
  debug: true, // defaults to false, logs information about operations and query times
  queryCount: 5, // defaults to 10, average time is calculated from the last X queries
});

const link = ApolloLink.from([
  ...yourOtherLinks,
  averageQueryTimeLink,
]);

const cache = new InMemoryCache();

export default new ApolloClient({
  link,
  cache,
});

This will add a averageQueryTime property to your Apollo cache, a milliseconds value based on the average of the last queryCount queries.

A basic query will give you reactive updates to the averageQueryTime property:

const AverageQueryTimeQuery = gql`
  query AverageQueryTime {
    averageQueryTime
  }
`;

Sample React Component

If the averageQueryTime exceeds the slowThreshold prop, the component will show the dismiss button.

If the user clicks the button, then the button will be hidden until the dismissTime is exceeded again.

import React, { Fragment, PureComponent } from 'react';
import PropTypes from 'prop-types';
import gql from 'graphql-tag';
import { graphql } from 'react-apollo';

class SlowConnectionIndicator extends PureComponent {
  static propTypes = {
    averageQueryTime: PropTypes.number,
    dismissTime: PropTypes.number,
    slowThreshold: PropTypes.number,
  };

  static defaultProps = {
    averageQueryTime: 0, // Passed in via the query, a default of 0 will prevent the initial display
    dismissTime: 500, // How long to dismiss the component on click in milliseconds
    slowThreshold: 3000, // The default threshold in milliseconds
  };

  state = {
    lastClick: undefined,
  };

  get thresholdExceeded() {
    return this.props.averageQueryTime > this.props.slowThreshold;
  }

  get lastClickExceeded() {
    if (!this.state.lastClick) return true;
    return Date.now() - this.state.lastClick > (this.props.dismissTime);
  }

  handleDismissClick = () => {
    this.setState({ lastClick: Date.now() });
  }

  render() {
    if (this.thresholdExceeded && this.lastClickExceeded) {
      return (
        <button onClick={this.handleDismissClick}>
          {'Slow Connection Detected! Click to Dismiss'}
        </button>
      );
    }
    return null;
  }
}

const AverageQueryTimeQuery = gql`
  query AverageQueryTime {
    averageQueryTime
  }
`;

export default graphql(AverageQueryTimeQuery, {
  name: 'averageQueryTimeQueryData',
  options: () => ({
    fetchPolicy: 'cache-only',
    variables: {},
  }),
  props: ({averageQueryTimeQueryData }) => ({
    averageQueryTime: averageQueryTimeQueryData.averageQueryTime || 0,
  }),
})(SlowConnectionIndicator);