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| 1 | +import { CatalystServerInfo } from '@dcl/catalyst-contracts' |
| 2 | +import { sleep } from '@dcl/snapshots-fetcher/dist/utils' |
| 3 | +import { ILoggerComponent } from '@well-known-components/interfaces' |
| 4 | +import future from 'fp-future' |
| 5 | +import { EnvironmentConfig } from '../../Environment' |
| 6 | +import { AppComponents } from '../../types' |
| 7 | +import { IContentClusterComponent } from './types' |
| 8 | + |
| 9 | +function shuffleArray<T>(arr: T[]): T[] { |
| 10 | + for (let i = arr.length - 1; i > 0; i--) { |
| 11 | + const j = Math.floor(Math.random() * (i + 1)) |
| 12 | + ;[arr[i], arr[j]] = [arr[j], arr[i]] |
| 13 | + } |
| 14 | + return arr |
| 15 | +} |
| 16 | + |
| 17 | +function normalizeContentBaseUrl(url: string): string { |
| 18 | + return url.toLowerCase().replace(/\/$/, '') |
| 19 | +} |
| 20 | + |
| 21 | +function getAllOtherAddressesOnDAO( |
| 22 | + allServers: Array<CatalystServerInfo>, |
| 23 | + normalizedContentServerAddress: string |
| 24 | +): string[] { |
| 25 | + const serverUrls = allServers |
| 26 | + .map(({ address }) => address) |
| 27 | + .filter((address) => normalizeContentBaseUrl(address) != normalizedContentServerAddress) |
| 28 | + |
| 29 | + return shuffleArray(serverUrls) |
| 30 | +} |
| 31 | + |
| 32 | +export function createContentCluster( |
| 33 | + components: Pick<AppComponents, 'logs' | 'daoClient' | 'env' | 'clock'>, |
| 34 | + timeBetweenSyncs: number |
| 35 | +): IContentClusterComponent { |
| 36 | + const logger: ILoggerComponent.ILogger = components.logs.getLogger('ContentCluster') |
| 37 | + |
| 38 | + const serverClients: Set<string> = new Set() |
| 39 | + let timeOfLastSync: number = 0 |
| 40 | + const syncFinishedEventCallbacks: Array<(serverClients: Set<string>) => void> = [] |
| 41 | + const stoppedFuture = future<void>() |
| 42 | + |
| 43 | + const normalizedContentServerAddress = normalizeContentBaseUrl( |
| 44 | + components.env.getConfig<string>(EnvironmentConfig.CONTENT_SERVER_ADDRESS) |
| 45 | + ) |
| 46 | + |
| 47 | + async function getContentServersFromDao(): Promise<string[]> { |
| 48 | + try { |
| 49 | + const allServersInDAO = await components.daoClient.getAllContentServers() |
| 50 | + |
| 51 | + if (allServersInDAO.length == 0) { |
| 52 | + throw new Error('There are no servers.') |
| 53 | + } |
| 54 | + |
| 55 | + const allServerBaseUrls = getAllOtherAddressesOnDAO(allServersInDAO, normalizedContentServerAddress) |
| 56 | + |
| 57 | + // Remove servers no longer in DAO |
| 58 | + for (const serverBaseUrl of serverClients) { |
| 59 | + if (!allServerBaseUrls.includes(serverBaseUrl)) { |
| 60 | + serverClients.delete(serverBaseUrl) |
| 61 | + logger.info(`Removing server '${serverBaseUrl}'`) |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + // Detect new servers |
| 66 | + for (const serverBaseUrl of allServerBaseUrls) { |
| 67 | + if (!serverClients.has(serverBaseUrl)) { |
| 68 | + serverClients.add(serverBaseUrl) |
| 69 | + logger.info(`Discovered new server '${serverBaseUrl}'.`) |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + timeOfLastSync = components.clock.now() |
| 74 | + |
| 75 | + for (const cb of syncFinishedEventCallbacks) { |
| 76 | + cb(serverClients) |
| 77 | + } |
| 78 | + } catch (error) { |
| 79 | + logger.error(`Failed to sync with the DAO \n${error}`) |
| 80 | + } |
| 81 | + return Array.from(serverClients) |
| 82 | + } |
| 83 | + |
| 84 | + async function syncWithDAOJob() { |
| 85 | + logger.info(`Starting sync with DAO every ${timeBetweenSyncs}ms`) |
| 86 | + |
| 87 | + while (stoppedFuture.isPending) { |
| 88 | + await Promise.race([sleep(timeBetweenSyncs), stoppedFuture]) |
| 89 | + if (!stoppedFuture.isPending) return |
| 90 | + await getContentServersFromDao() |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + return { |
| 95 | + async start() { |
| 96 | + await getContentServersFromDao() |
| 97 | + syncWithDAOJob().catch(logger.error) |
| 98 | + }, |
| 99 | + |
| 100 | + async stop() { |
| 101 | + stoppedFuture.resolve() |
| 102 | + }, |
| 103 | + |
| 104 | + getAllServersInCluster(): string[] { |
| 105 | + return Array.from(serverClients) |
| 106 | + }, |
| 107 | + |
| 108 | + onSyncFinished(cb: (serverClients: Set<string>) => void): void { |
| 109 | + syncFinishedEventCallbacks.push(cb) |
| 110 | + }, |
| 111 | + |
| 112 | + getStatus(): { lastSyncWithDAO: number } { |
| 113 | + return { lastSyncWithDAO: timeOfLastSync } |
| 114 | + } |
| 115 | + } |
| 116 | +} |
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