Add graphs and retention metrics to admin dashboard (#16829)

app/javascript/mastodon/components/admin/Counter.js

@@ -0,0 +1,115 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'mastodon/api';
+import { FormattedNumber } from 'react-intl';
+import { Sparklines, SparklinesCurve } from 'react-sparklines';
+import classNames from 'classnames';
+import Skeleton from 'mastodon/components/skeleton';
+
+const percIncrease = (a, b) => {
+  let percent;
+
+  if (b !== 0) {
+    if (a !== 0) {
+      percent = (b - a) / a;
+    } else {
+      percent = 1;
+    }
+  } else if (b === 0 && a === 0) {
+    percent = 0;
+  } else {
+    percent = - 1;
+  }
+
+  return percent;
+};
+
+export default class Counter extends React.PureComponent {
+
+  static propTypes = {
+    measure: PropTypes.string.isRequired,
+    start_at: PropTypes.string.isRequired,
+    end_at: PropTypes.string.isRequired,
+    label: PropTypes.string.isRequired,
+    href: PropTypes.string,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { measure, start_at, end_at } = this.props;
+
+    api().post('/api/v1/admin/measures', { keys: [measure], start_at, end_at }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { label, href } = this.props;
+    const { loading, data } = this.state;
+
+    let content;
+
+    if (loading) {
+      content = (
+        <React.Fragment>
+          <span className='sparkline__value__total'><Skeleton width={43} /></span>
+          <span className='sparkline__value__change'><Skeleton width={43} /></span>
+        </React.Fragment>
+      );
+    } else {
+      const measure = data[0];
+      const percentChange = percIncrease(measure.previous_total * 1, measure.total * 1);
+
+      content = (
+        <React.Fragment>
+          <span className='sparkline__value__total'><FormattedNumber value={measure.total} /></span>
+          <span className={classNames('sparkline__value__change', { positive: percentChange > 0, negative: percentChange < 0 })}>{percentChange > 0 && '+'}<FormattedNumber value={percentChange} style='percent' /></span>
+        </React.Fragment>
+      );
+    }
+
+    const inner = (
+      <React.Fragment>
+        <div className='sparkline__value'>
+          {content}
+        </div>
+
+        <div className='sparkline__label'>
+          {label}
+        </div>
+
+        <div className='sparkline__graph'>
+          {!loading && (
+            <Sparklines width={259} height={55} data={data[0].data.map(x => x.value * 1)}>
+              <SparklinesCurve />
+            </Sparklines>
+          )}
+        </div>
+      </React.Fragment>
+    );
+
+    if (href) {
+      return (
+        <a href={href} className='sparkline'>
+          {inner}
+        </a>
+      );
+    } else {
+      return (
+        <div className='sparkline'>
+          {inner}
+        </div>
+      );
+    }
+  }
+
+}