Question

Lets say I've some REST api server (maybe Express one).

When the life cycle begins (i.e someone GET 'http://foo/bar') there is some data in the Request object.

So let's say I've got something like this:

const method1 = require('some-module').method1;
app.get('/foo/bar', (req, res, next) => {
    method1();
});

I want a simple way in the some-module.js to get a winston instance that somehow knows about all relevant data so I don't need every time to pass the request object all over my code.

The trivial solution is to pass the method1 the object and inside do like

method1(req){
    winston.info('my message', {requestId: req.id}; 
}

But this is ugly because I need to change the signature of all my stuff just for logs.

Another option is to make everything a class that extends winston and do something like

app.get('/foo/bar', (req, res, next) => {
   const foo = new Foo(new winstonWrapper(req));
});

and than foo.info('msg') will call something like winston.info('msg',{reqId:req.id})

What an elegant way can you suggest to create a winston instance upon request and use it in other modules easily?

Winston instance per http request

0 个答案: