Show daily stats with line chart

ui/src/components/DailyStatsChart.tsx

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+import React from "react";
+import {
+  LineChart,
+  Line,
+  XAxis,
+  YAxis,
+  CartesianGrid,
+  Tooltip,
+  Legend,
+  ResponsiveContainer,
+} from "recharts";
+import { useTheme, Theme } from "@material-ui/core/styles";
+import { DailyStat } from "../api";
+
+interface Props {
+  data: { [qname: string]: DailyStat[] };
+  numDays: number;
+}
+
+interface ChartData {
+  succeeded: number;
+  failed: number;
+  date: string;
+}
+
+export default function DailyStatsChart(props: Props) {
+  const data = makeChartData(props.data, props.numDays);
+  const theme = useTheme<Theme>();
+  return (
+    <ResponsiveContainer>
+      <LineChart data={data}>
+        <CartesianGrid strokeDasharray="3 3" />
+        <XAxis dataKey="date" minTickGap={10} />
+        <YAxis />
+        <Tooltip />
+        <Legend />
+        <Line
+          type="monotone"
+          dataKey="succeeded"
+          stroke={theme.palette.success.main}
+        />
+        <Line
+          type="monotone"
+          dataKey="failed"
+          stroke={theme.palette.error.main}
+        />
+      </LineChart>
+    </ResponsiveContainer>
+  );
+}
+
+function makeChartData(
+  queueStats: { [qname: string]: DailyStat[] },
+  numDays: number
+): ChartData[] {
+  const dataByDate: { [date: string]: ChartData } = {};
+  for (const qname in queueStats) {
+    for (const stat of queueStats[qname]) {
+      if (!dataByDate.hasOwnProperty(stat.date)) {
+        dataByDate[stat.date] = { succeeded: 0, failed: 0, date: stat.date };
+      }
+      dataByDate[stat.date].succeeded += stat.processed - stat.failed;
+      dataByDate[stat.date].failed += stat.failed;
+    }
+  }
+  return Object.values(dataByDate).sort(sortByDate).slice(-numDays);
+}
+
+function sortByDate(x: ChartData, y: ChartData): number {
+  return Date.parse(x.date) - Date.parse(y.date);
+}