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Epoch is not resolved from the network when possible
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * Copyright 2021 NEM | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| import { lookup } from 'dns'; | ||
| import { ChainInfo, RepositoryFactory, RepositoryFactoryHttp } from 'symbol-sdk'; | ||
| import { LogType } from '../logger'; | ||
| import Logger from '../logger/Logger'; | ||
| import LoggerFactory from '../logger/LoggerFactory'; | ||
| import { ConfigPreset } from '../model'; | ||
|
|
||
| const logger: Logger = LoggerFactory.getLogger(LogType.System); | ||
|
|
||
| export interface RepositoryInfo { | ||
| repositoryFactory: RepositoryFactory; | ||
| restGatewayUrl: string; | ||
| chainInfo: ChainInfo; | ||
| } | ||
| export class RemoteNodeService { | ||
| public async resolveCurrentFinalizationEpoch(presetData: ConfigPreset): Promise<number> { | ||
| const votingNode = presetData.nodes?.find((n) => n.voting); | ||
| if (!votingNode) { | ||
| return presetData.lastKnownNetworkEpoch; | ||
| } | ||
| const remoteNodeService = new RemoteNodeService(); | ||
| if (!(await remoteNodeService.isConnectedToInternet())) { | ||
| return presetData.lastKnownNetworkEpoch; | ||
| } | ||
| return (await remoteNodeService.getBestFinalizationEpoch(presetData.knownRestGateways)) || presetData.lastKnownNetworkEpoch; | ||
| } | ||
|
|
||
| public async getBestFinalizationEpoch(urls: string[] | undefined): Promise<number | undefined> { | ||
| if (!urls || !urls.length) { | ||
| return undefined; | ||
| } | ||
| const repositoryInfo = this.sortByHeight(await this.getKnownNodeRepositoryInfos(urls)).find((i) => i); | ||
| const finalizationEpoch = repositoryInfo?.chainInfo.latestFinalizedBlock.finalizationEpoch; | ||
| if (finalizationEpoch) { | ||
| logger.info(`The current network finalization epoch is ${finalizationEpoch}`); | ||
| } | ||
| return finalizationEpoch; | ||
| } | ||
|
|
||
| public async getBestRepositoryInfo(urls: string[]): Promise<RepositoryInfo> { | ||
| const repositoryInfo = this.sortByHeight(await this.getKnownNodeRepositoryInfos(urls)).find((i) => i); | ||
| if (!repositoryInfo) { | ||
| throw new Error(`No up and running node could be found out of: \n - ${urls.join('\n - ')}`); | ||
| } | ||
| logger.info(`Connecting to node ${repositoryInfo.restGatewayUrl}`); | ||
| return repositoryInfo; | ||
| } | ||
|
|
||
| private sortByHeight(repos: RepositoryInfo[]): RepositoryInfo[] { | ||
| return repos | ||
| .filter((b) => b.chainInfo) | ||
| .sort((a, b) => { | ||
| if (!a.chainInfo) { | ||
| return 1; | ||
| } | ||
| if (!b.chainInfo) { | ||
| return -1; | ||
| } | ||
| return b.chainInfo.height.compare(a.chainInfo.height); | ||
| }); | ||
| } | ||
|
|
||
| public isConnectedToInternet(): Promise<boolean> { | ||
| return new Promise<boolean>((resolve) => { | ||
| lookup('google.com', (err) => { | ||
| if (err && err.code == 'ENOTFOUND') { | ||
| resolve(false); | ||
| } else { | ||
| resolve(true); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| private async getKnownNodeRepositoryInfos(urls: string[]): Promise<RepositoryInfo[]> { | ||
| logger.info(`Looking for the best node out of: \n - ${urls.join('\n - ')}`); | ||
| return ( | ||
| await Promise.all( | ||
| urls.map( | ||
| async (restGatewayUrl): Promise<RepositoryInfo | undefined> => { | ||
| const repositoryFactory = new RepositoryFactoryHttp(restGatewayUrl); | ||
| try { | ||
| const chainInfo = await repositoryFactory.createChainRepository().getChainInfo().toPromise(); | ||
| return { | ||
| restGatewayUrl, | ||
| repositoryFactory, | ||
| chainInfo, | ||
| }; | ||
| } catch (e) { | ||
| const message = `There has been an error talking to node ${restGatewayUrl}. Error: ${e.message}}`; | ||
| logger.warn(message); | ||
| return undefined; | ||
| } | ||
| }, | ||
| ), | ||
| ) | ||
| ) | ||
| .filter((i) => i) | ||
| .map((i) => i as RepositoryInfo); | ||
| } | ||
| } |
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