caver-js/packages/caver-middleware/src/builtins/timeMeasure.js

caver-js is a JavaScript API library that allows developers to interact with a Kaia node

/*
    Copyright 2018 The caver-js Authors
    This file is part of the caver-js library.

    The caver-js library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    The caver-js library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with the caver-js. If not, see <http://www.gnu.org/licenses/>.
*/

const timeMeasure = (memoize => () => (data, next, bypass) => {
    if (!memoize[data.id]) {
        memoize[data.id] = new Date().getTime()
        bypass()
        return
    }

    memoize[data.id] = new Date().getTime() - memoize[data.id]
    console.log(`request '${data.id}' takes an ${memoize[data.id]} milliseconds for responding. : ${data.method}`)
    next(
        Object.assign(data, {
            timeTakes: memoize[data.id],
        })
    )
})({})

module.exports = timeMeasure