CODEWITHSUNDEEP
electronconsole.log
Evgeny
Evgeny

Reputation: 274

Electron handle console.log messages in main process

Is there way to handle console.log messages from renderer in main process? Similar to CefDisplayHandler::OnConsoleMessage handler in Cef.

Upvotes: 0

Views: 1860

Answers (2)

Armen Michaeli
Armen Michaeli

Reputation: 9140

The ability to intercept console messages generated by the renderer process, in the main process, was implemented in Electron version v1.8.2-beta.3 (as far as I were able to determine).

To be able to handle these messages, one attaches a "console-message" event handler to the webContents object property of a BrowserWindow object.

A rather straightforward replication of messages by the main process, could be implemented as follows (win refers to a BrowserWindow you want to capture messages for):

const log_level_names = { "-1": "DEBUG", "0": "INFO", "1": "WARN", "2": "ERROR" };
win.webContents.on("console-message", (ev, level, message, line, file) => {
    console.log(`${new Date().toUTCString()}\t${log_level_names[level]}\t${message} (${file}:${line})`);
});

Upvotes: 1

Hans Koch
Hans Koch

Reputation: 4481

You can do this in three ways,

  • Set the enviroment variableELECTRON_ENABLE_LOGGING=true to parse every console.log to your CLI
  • Do a IPCrenderer message to IPCmain, which the logs it for you

  • Add a function to app from the main process

    # MAIN
const {app} = require('electron')
app.MySuperCoolLoggingUtility = function (msg) { 
    console.log(msg) 
}

# RENDERER
require('electron').remote.app.MySuperCoolLoggingUtility('hi')

There are also some ways to limit the log level for specific files via --vmodule= but it is not close to the handler of normal Cef. So you will probably build your own utility function for it.

Upvotes: 1

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