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This article introduces the knowledge of "how to use logs in Hyperledger Fabric Node.js development". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Overview

Hyperledger fabric node.js client logging uses the node.js winston development package. Logging is initialized when the node.js application first loads the hyperledger structure package. All HyperledgeFabric client objects will use the same settings (peer, orderer, ChannelEventHub).

Const Client = require ('fabric-client'); / / the logging is now set

There are four levels of logging:

Info, message.

Warn, warning.

Error, error.

Debug, debugging.

By default, info, warn, and error entries are sent to the Control Station console and debug is not logged.

How to change logging

Logging for HyperledgeFabric clients is controlled by the configuration settings hfc-logging and the environment settings HFC_LOGGING.

Change the log setting in the default.json configuration file to an entry:

"hfc-logging": "{'debug':'console',' info':'console'}"

Use environment settings to override and modify the configuration:

Export HFC_LOGGING=' {"debug": "console", "info": "console"}'

Logging can use files to write entries by specifying the file location as a level value.

Export HFC_LOGGING=' {"debug": "/ temp/debug.log", "info": "console"} 'uses logging in the application

When you need to record entries in application code and HyperledgeFabric client entries, use the following to access the same logger. After version 1.2:

Const logger = Client.getLogger ('APPLICATION')

Before 1.2:

Const sdkUtils = require ('fabric-client/lib/utils.js'); const logger = sdkUtils.getLogger (' APPLICATION')

Log:

Const log_info = 'Sometext';logger.info ('% s infotext', log_info); / / will log// info: [APPLICATION]: Sometext infotextlogger.warn ('% s warntext', log_info); / / will log// warn: [APPLICATION]: Sometext warntextlogger.error ('% s errortext', log_info); / / will log// error: [APPLICATION]: Sometext errortextlogger.debug ('% s debugtext', log_info) / / will log// debug: [APPLICATION]: this is the end of Sometext debugtext's "how to use logs in Hyperledger Fabric Node.js Development". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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