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firstAvailableProgressLog.ts
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firstAvailableProgressLog.ts
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/*
* Copyright © 2018 Atomist, Inc.
*
* 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 { ProgressLog } from "../../spi/log/ProgressLog";
/**
* Return the first available progress log.
* Error if none is available: Pass in a fallback that's always available.
* @param log first log
* @param {ProgressLog} moreLogs
* @return {Promise<ProgressLog>}
*/
export async function firstAvailableProgressLog(log: ProgressLog, ...moreLogs: ProgressLog[]): Promise<ProgressLog> {
const logs = [log].concat(...moreLogs);
for (const pl of logs) {
const avail = await pl.isAvailable();
if (avail) {
return pl;
}
}
throw new Error("No logger available: Please pass in at least one fallback that's always available");
}