homepage/src/widgets/glances/metrics/memory.jsx

import dynamic from "next/dynamic";
import { useState, useEffect } from "react";
import { useTranslation } from "next-i18next";

import Error from "../components/error";
import Container from "../components/container";
import Block from "../components/block";

import useWidgetAPI from "utils/proxy/use-widget-api";

const ChartDual = dynamic(() => import("../components/chart_dual"), { ssr: false });

const pointsLimit = 15;

export default function Component({ service }) {
  const { t } = useTranslation();

  const [dataPoints, setDataPoints] = useState(new Array(pointsLimit).fill({ value: 0 }, 0, pointsLimit));

  const { data, error } = useWidgetAPI(service.widget, 'mem', {
    refreshInterval: 1000,
  });

  useEffect(() => {
    if (data) {
      setDataPoints((prevDataPoints) => {
        const newDataPoints = [...prevDataPoints, { a: data.used, b: data.free }];
          if (newDataPoints.length > pointsLimit) {
              newDataPoints.shift();
          }
          return newDataPoints;
      });
    }
  }, [data]);

  if (error) {
    return <Container><Error error={error} /></Container>;
  }

  if (!data) {
    return <Container><Block position={{bottom: 2, left: 2}}>-</Block></Container>;
  }

  return (
    <Container>
      <ChartDual
        dataPoints={dataPoints}
        max={data.total}
        label={[t("resources.used"), t("resources.free")]}
        formatter={(value) => t("common.bytes", {
          value,
          maximumFractionDigits: 0,
        })}
      />

      {data && !error && (
        <Block position={{bottom: 3, left: 3}}>
          {data.free && (
            <div className="text-xs opacity-50">
              {t("common.bytes", {
                value: data.free,
                maximumFractionDigits: 0,
              })} {t("resources.free")}
            </div>
          )}

          {data.total && (
            <div className="text-xs opacity-50">
              {t("common.bytes", {
                value: data.total,
                maximumFractionDigits: 0,
              })} {t("resources.total")}
            </div>
          )}
        </Block>
      )}

      <Block position={{bottom: 3, right: 3}}>
        <div className="text-xs font-bold opacity-75">
          {t("common.bytes", {
            value: data.used,
            maximumFractionDigits: 0,
          })} {t("resources.used")}
        </div>
      </Block>
    </Container>
  );
}