47 lines
2.2 KiB
JavaScript
47 lines
2.2 KiB
JavaScript
import { Brackets } from "typeorm";
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import { fetchMeta } from "./fetch-meta.js";
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import { Instances } from "../models/index.js";
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import { DAY } from "../const.js";
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import { shouldBlockInstance } from "./should-block-instance.js";
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// Threshold from last contact after which an instance will be considered
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// "dead" and should no longer get activities delivered to it.
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const deadThreshold = 7 * DAY;
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/**
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* Returns the subset of hosts which should be skipped.
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*
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* @param hosts array of punycoded instance hosts
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* @returns array of punycoed instance hosts that should be skipped (subset of hosts parameter)
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*/ export async function skippedInstances(hosts) {
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// first check for blocked instances since that info may already be in memory
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const meta = await fetchMeta();
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const shouldSkip = await Promise.all(hosts.map((host)=>shouldBlockInstance(host, meta)));
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const skipped = hosts.filter((_, i)=>shouldSkip[i]);
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// if possible return early and skip accessing the database
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if (skipped.length === hosts.length) return hosts;
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const deadTime = new Date(Date.now() - deadThreshold);
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return skipped.concat(await Instances.createQueryBuilder("instance").where("instance.host in (:...hosts)", {
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// don't check hosts again that we already know are suspended
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// also avoids adding duplicates to the list
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hosts: hosts.filter((host)=>!skipped.includes(host))
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}).andWhere(new Brackets((qb)=>{
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qb.where("instance.isSuspended").orWhere(new Brackets((qb)=>{
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qb.where("instance.isNotResponding").andWhere("instance.lastCommunicatedAt < :deadTime", {
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deadTime
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});
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}));
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})).select("host").getRawMany());
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}
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/**
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* Returns whether a specific host (punycoded) should be skipped.
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* Convenience wrapper around skippedInstances which should only be used if there is a single host to check.
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* If you have multiple hosts, consider using skippedInstances instead to do a bulk check.
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*
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* @param host punycoded instance host
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* @returns whether the given host should be skipped
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*/ export async function shouldSkipInstance(host) {
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const skipped = await skippedInstances([
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host
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]);
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return skipped.length > 0;
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}
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