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logger.ts
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// Copyright 2024 Google LLC
//
// 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
//
// https://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 * as util from 'util';
/*! The external function used to emit logs. */
let logFunction: ((msg: string) => void) | null = null;
/**
* Log function to use for debug output. By default, we don't perform any
* logging.
*
* @private
* @internal
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export function logger(source: string, msg: string, ...otherArgs: any[]) {
if (logFunction) {
const time = new Date().toISOString();
const formattedMsg = util.format(
`D ${time} | ${source} | ${msg} |`,
...otherArgs,
);
logFunction(formattedMsg);
}
}
/**
* Sets or disables the log function for all active BigQuery instances.
*
* @param logger A log function that takes a message (such as `console.log`) or
* `null` to turn off logging.
*/
export function setLogFunction(logger: ((msg: string) => void) | null): void {
logFunction = logger;
}