incremental Data Fetching using useSWR
not quite like I want but should be good enough
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Neshura
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fff04d019a
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1 changed files with 127 additions and 87 deletions
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@ -1,32 +1,28 @@
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import Head from 'next/head'
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import Link from 'next/link'
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import styles from '/styles/Home.module.css'
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import { Service, CustomLink, EntryList, ServiceStatus, ServiceType, ServiceLocation } from '../interfaces/LinkTypes'
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import { Service, ServiceStatus, ServiceType, ServiceLocation } from '../interfaces/LinkTypes';
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import Dockerode from 'dockerode';
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import { ReactElement, useEffect, useState } from 'react'
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import useSWR, { KeyedMutator } from 'swr';
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import { ReactElement } from 'react'
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import useSWR from 'swr';
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const fetcher = (url: string) => fetch(url).then((res) => res.json())
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//function Services(props: EntryList) {
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const Services = () => {
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const { serviceList, isLoading, isError } = useServices();
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function Services() {
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const { initialData, fullData, loadingInitial, loadingFull, error } = useServices();
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let content: ReactElement = <></>;
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// TODO: look into asyncing this as well
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useStatus(serviceList);
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if (isError) {
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content = <div className={styles.grid}>Error Loading data</div>
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if (error) { content = <div>Error loading data</div> }
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else if (loadingInitial) {
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content = <div>Loading</div>
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}
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else if (isLoading) {
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content = <div className={styles.grid}>Loading..</div>
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}
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else if (serviceList) {
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else if (loadingFull) {
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content =
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<div className={styles.grid}>
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{serviceList.map((item: Service) => (
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{initialData?.map((item: Service) => (
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<Link key={item.name} href={item.href}>
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<a className={styles.contentcard}>
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<div className={styles.contenttitle}><h2>{item.name}</h2></div>
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@ -38,6 +34,25 @@ const Services = () => {
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))}
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</div>
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}
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else if (fullData) {
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content =
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<div className={styles.grid}>
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{fullData.map((item: Service) => (
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<Link key={item.name} href={item.href}>
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<a className={styles.contentcard}>
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<div className={styles.contenttitle}><h2>{item.name}</h2></div>
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<div className={item.status === ServiceStatus.online ? styles.contentonline : styles.contentoffline}>{item.status}</div>
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<div><p>{item.desc}</p></div>
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<div className={styles.cardwarn}><p>{item.warn}</p></div>
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</a>
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</Link>
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))}
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</div>
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}
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else {
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content = <div>Error loading data</div>
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}
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return (
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<>
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<Head>
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@ -60,42 +75,24 @@ const Services = () => {
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)
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}
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function useStatus(serviceList: Service[] | undefined) {
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const { data, error } = useSWR('/api/containers', fetcher);
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async function getStatus(entry: Service, containers: Dockerode.ContainerInfo[]) {
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// Currently the only location supporting different fetching depending on type is brr7-4800u
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// Others to follow but low prio as this is currently the only location used
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if (data && serviceList) {
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serviceList.forEach((service: Service) => {
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getStatus(data, service);
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})
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}
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else if (error) {
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console.log(error);
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}
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}
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function useServices(): { serviceList: Service[] | undefined, isLoading: boolean, isError: boolean } {
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const { data, error } = useSWR('/api/services', fetcher);
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return {
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serviceList: data,
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isLoading: !error && !data,
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isError: error
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};
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}
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function getStatus(containers: Dockerode.ContainerInfo[], entry: Service) {
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// for now only the BRR7-4800U can be used with Docker, needs changing once more Servers are used
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// TODO: support multiple locations for docker
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// Location BRR7-4800U
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if (entry.location === ServiceLocation.brr7_4800u) {
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// app in this context means any non-docker page
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// Type APP
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if (entry.type === ServiceType.app) {
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fetch(entry.href)
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.then((data: Response) => {
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if (data.ok) {
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if (data.status == 200 || data.status == 301 || data.status == 302) {
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await fetch(entry.href)
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.then((response) => {
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if (response.ok) {
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switch(response.status) {
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case 200:
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case 301:
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case 302:
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entry.status = ServiceStatus.online;
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}
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else {
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break;
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default:
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entry.status = ServiceStatus.offline;
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}
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}
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@ -103,53 +100,96 @@ function getStatus(containers: Dockerode.ContainerInfo[], entry: Service) {
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entry.status = ServiceStatus.offline;
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}
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})
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.catch(error => {
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console.log(error);
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entry.status = ServiceStatus.error;
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});
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}
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else if (entry.type === "docker") {
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entry.status = ServiceStatus.offline;
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// Loop over every found container and compare to the entry provided
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containers.forEach((container: Dockerode.ContainerInfo) => {
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console.log(container)
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if (container.Names.includes("/" + entry.docker_container_name) || container.Names.includes(entry.docker_container_name)) {
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if (container.State === "running") {
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entry.status = ServiceStatus.online;
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}
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else {
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entry.status = ServiceStatus.offline;
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}
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}
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if (entry.docker_container_name == null) {
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console.log("MISSING DOCKER CONTAINER NAME FOR " + entry.name);
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entry.status = ServiceStatus.error;
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}
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});
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}
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else { entry.status = ServiceStatus.error }
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}
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// for non-local locations pinging can be used to see if they're up
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else if (entry.location === ServiceLocation.other) {
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fetch(entry.href)
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.then((data) => {
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if (data.ok) {
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if (data.status == 200 || data.status == 301 || data.status == 302) {
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return (entry.status = ServiceStatus.online);
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}
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else (entry.status = ServiceStatus.offline);
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}
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else {
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entry.status = ServiceStatus.offline;
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}
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})
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.catch((error) => {
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console.log(error);
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console.error("Error pinging Website: ", error);
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entry.status = ServiceStatus.error;
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});
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})
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}
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else { entry.status = ServiceStatus.error }
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return;
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// Type Docker
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else if (entry.type === ServiceType.docker) {
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containers.forEach((container) => {
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// Docker API returns container names with / prepended, not sure whether this always happens so both cases are checked
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if (container.Names.includes( entry.docker_container_name || "/" + entry.docker_container_name)) {
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// so far only "running" is properly implemented, mroe cases to follow as needed
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switch (container.State) {
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case "running":
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entry.status = ServiceStatus.online;
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break;
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default:
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console.log("Container Status " + container.State + " has no case implemented");
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entry.status = ServiceStatus.offline;
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}
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}
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// If container name is not missing the container is set to offline
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else if (entry.docker_container_name !== null) {
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console.warn("Container for " + entry.name + " could not be found");
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entry.status = ServiceStatus.offline;
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}
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else {
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console.error("Container Name not specified");
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entry.status = ServiceStatus.error;
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}
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})
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}
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// If no Type matches
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else {
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console.warn("Service Type for Service " + entry.name + " not specified or invalid");
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entry.status = ServiceStatus.error;
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}
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}
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// Location Other
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// TODO: implement docker type for other locations
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else if (entry.location === ServiceLocation.other) {
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// Currently uses the same handling as app type for the other location
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await fetch(entry.href)
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.then((response) => {
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if (response.ok) {
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switch(response.status) {
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case 200:
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case 301:
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case 302:
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entry.status = ServiceStatus.online;
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break;
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default:
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entry.status = ServiceStatus.offline;
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}
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}
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else {
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entry.status = ServiceStatus.offline;
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}
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})
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.catch((error) => {
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console.error("Error pinging Website: ", error);
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entry.status = ServiceStatus.error;
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})
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}
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// If no Location matches
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else {
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console.warn("Service Location for Service " + entry.name + " not specified");
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entry.status = ServiceStatus.error;
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}
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return entry;
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}
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const fetchFullDataArray = (containerData: Dockerode.ContainerInfo[], dataSet: Service[]) => {
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const fetchStatus = (entry: Service) => getStatus(entry, containerData);
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return Promise.all(dataSet.map(fetchStatus));
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}
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function useServices() {
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const { data: containerData, error: containerError } = useSWR('/api/containers', fetcher);
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const { data: initialData, error: initialError } = useSWR('/api/services', fetcher);
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const loadingInitial = !initialData && !initialError
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const { data: fullData, error: fullError } = useSWR((initialData && containerData) ? [containerData, initialData] : null, fetchFullDataArray)
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const loadingFull = !fullData && !fullError
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return {
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initialData,
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fullData,
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loadingInitial,
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loadingFull,
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error: initialError || fullError || containerError,
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};
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}
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export default Services
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