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logger-decorator

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provides a unified and simple approach for class and function logging

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![Logo](https://raw.githubusercontent.com/pustovitDmytro/logger-decorator/master/.docs/logo_250.png "logger-decorator")
# logger-decorator
Provides a unified and simple approach for class and function logging.

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## 🇺🇦 Help Ukraine
I woke up on my 26th birthday at 5 am from the blows of russian missiles. They attacked the city of Kyiv, where I live, as well as the cities in which my family and friends live. Now my country is a war zone.

We fight for democratic values, freedom, for our future! Once again Ukrainians have to stand against evil, terror, against genocide. The outcome of this war will determine what path human history is taking from now on.

💛💙  Help Ukraine! We need your support! There are [dozen ways][ukr-link] to help us, just do it!

## Table of Contents
- [logger-decorator](#logger-decorator)
  - [🇺🇦 Help Ukraine](#-help-ukraine)
  - [Table of Contents](#table-of-contents)
  - [Requirements](#requirements)
  - [Installation](#installation)
  - [Usage](#usage)
    - [Configuration](#configuration)
    - [Functions](#functions)
    - [Classes](#classes)
    - [Sanitizers](#sanitizers)
    - [Logger](#logger)
  - [Contribute](#contribute)

## Requirements
[![Platform Status][node-ver-test-badge]][node-ver-test-url]

To use library you need to have [node](https://nodejs.org) and [npm](https://www.npmjs.com) installed in your machine:

* node `>=10`
* npm `>=6`

Package is [continuously tested][node-ver-test-url] on darwin, linux and win32 platforms. All active and maintenance [LTS](https://nodejs.org/en/about/releases/) node releases are supported.

## Installation

To install the library run the following command:
```bash
  npm i --save logger-decorator
```

## Usage

The package provides a simple decorator, so you can simply wrap functions or classes with it or use [@babel/plugin-proposal-decorators](https://babeljs.io/docs/en/babel-plugin-proposal-decorators) in case you love to complicate things.

The recommended way for using 'logger-decorator' is to build own decorator singleton inside the app.

```javascript
import { Decorator } from 'logger-decorator';

const decorator = new Decorator(config);
```

Or just use decorator with the default configuration:

```javascript
import log from 'logger-decorator';

@log({ level: 'verbose' })
class Rectangle {
      constructor(height, width) {
          this.height = height;
          this.width = width;
      }

get area() {
          return this.calcArea();
      }

calcArea() {
          return this.height * this.width;
      }
  }
```

### Configuration

Config must be a JavaScript `Object` with the following attributes:
  * **logger** - the logger that the build decorator will use. *[console](https://nodejs.org/api/console.html)* by default; see [logger](#logger) for more details.
  * **name** - the app name to include in all logs; it could be omitted.

Next values could also be passed to the constructor config, but are customizable from the `decorator(customConfig)` invocation:
  * **timestamp** - if set to *true*, timestamps will be added to all logs.
  * **level** - the default log-level; pay attention that the logger must support it as `logger.level(smth)`, *'info'* by default. Also, a *function* could be passed. The function will receive logged data and should return the log-level as a *string*.
  * **errorLevel** - the level used for errors; *'error'* by default. Also, a *function* could be passed. The function will receive logged data and should return the log-level as a *string*.
  * **paramsLevel** - the level used for logging params. Logger will print input params before the function starts executing. Also, a *function* could be passed. The function will receive logged data and should return the log-level as a *string*. If omitted, nothing will be logged before execution.
  * **errorsOnly** - if set to *true*, the logger will catch only errors.
  * **logErrors**: next options available:
    -   `deepest`: log only the deepest occurrence of the error. This option prevents 'error spam.'
  * **paramsSanitizer** - function to sanitize input parameters from sensitive or redundant data; see [sanitizers](#sanitizers) for more details, by default [dataSanitizer](#sanitizers).
  * **resultSanitizer** - output data sanitizer, by default [dataSanitizer](#sanitizers).
  * **errorSanitizer** - error sanitizer, by default [simpleSanitizer](#sanitizers).
  * **contextSanitizer** - function context sanitizer; if omitted, no context will be logged.
  * **duplicates** - if set to *true*, it is possible to use multiple decorators at once (see [example](#duplicates)).
  * **keepReflectMetadata** - if `logger-decorator` is used with other decorators, they can set own [reflect metadata](https://blog.bitsrc.io/typescripts-reflect-metadata-what-it-is-and-how-to-use-it-fb7b19cfc7e2). By passing `keepReflectMetadata` array, you can prevent metadata from resetting. For example, for NestJS, it's a good idea to use `{ keepReflectMetadata: ['method', 'path'] }`.

Next parameters could help in class method filtering:
  *  **getters** - if set to *true*, [getters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get) will also be logged (applied to class and class-method decorators).
  *  **setters** - if set to *true*, [setters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set) will also be logged (applied to class and class-method decorators).
  *  **classProperties** - if set to *true*, [class-properties](https://babeljs.io/docs/en/babel-plugin-proposal-class-properties) will also be logged (applied to class decorators only).
  *  **include** - array with method names for which logs will be added.
  *  **exclude** - array with method names for which logs won't be added.
  *  **methodNameFilter** - function to filter method names.

### Functions

To decorate a function with ```logger-decorator``` the next approach can be applied:

```javascript
import { Decorator } from 'logger-decorator';

const decorator = new Decorator({ logger });
const decorated = decorator()((a, b) => {
    return a + b;
});

const res = decorated(5, 8); // res === 13
/*
      logger will print:
      { method: 'sum', params: '[ 5, 8 ]', result: '13' }
  */
```

or, with async functions:

```javascript
const log = new Decorator({ logger });
const decorated = log({ methodName })(sumAsync);

await decorated(5, 8); // 13
```

Besides ```methodName``` any of the  ```timestamp, level, paramsSanitizer, resultSanitizer, errorSanitizer, contextSanitizer, etc...``` can be transferred to ```log(customConfig)``` and will replace global values.

### Classes

To embed logging for all class methods, follow the next approach:

```javascript
import { Decorator } from 'logger-decorator';
const log = new Decorator();

@log()
class MyClass {
    constructor(config) { // construcor will be ommited
        this.config = config;
    }

_run(a, b) { // methods, started with underscore will be ommited
        return a + b + 10;
    }

async run(a, b) { // will be decorated
        const result = this._run(a, b);
        return result * 2;
    }
```

When needed, the decorator can be applied to a specific class method. It is also possible to use multiple decorators <a name="duplicates"></a> at once:

```javascript
    const decorator = new Decorator({ logger, contextSanitizer: data => ({ base: data.base }) }); // level info by default

@decorator({ level: 'verbose', contextSanitizer: data => data.base, dublicates: true })
    class Calculator {
        base = 10;
        _secret = 'x0Hdxx2o1f7WZJ';
        @decorator() // default contextSanitizer have been used
        sum(a, b) {
            return a + b + this.base;
        }
    }

const calculator = new Calculator();
    calculator.sum(5, 7); // 22
 /*
      next two logs will appear:

1) level: 'info':
          { params: '[ 5, 7 ]', result: '22', context: { base: 10 } }
      
      2) level: 'verbose':
          { params: '[ 5, 7 ]', result: '22', context: 10 }
  */
    }
```

### Sanitizers

*Sanitizer* is a function, that recieves data as the first argument, and returns sanitized data.
default *logger-decorator* sanitizers are:

* ```simpleSanitizer``` - default [inspect](https://nodejs.org/api/util.html#util_util_inspect_object_options) function
* ```dataSanitizer``` - firstly replace all values with key ```%password%``` replaced to ```***```, and then ```simpleSanitizer```.

**Performance notes**

`dataSanitizer` could impact performance greatly on complex objects and large arrays. If you don't need to sanitize sensitive patterns (tokens, passwords), use simpleSanitizer, or write a custom handler.

### Logger

*Logger* can be a function, with the next structure:

```javascript
const logger = (level, data) => {
    console.log(level, data);
};
```
Otherwise, you can define each logLevel separately in *Object* / *Class* logger:

```javascript
const logger = {
    info    : console.log,
    verbose : console.log,
    error   : console.error
};
```

## Contribute

Make the changes to the code and tests. Then commit to your branch. Be sure to follow the commit message conventions. Read [Contributing Guidelines](.github/CONTRIBUTING.md) for details.

[npm]: https://www.npmjs.com/package/logger-decorator
[github]: https://github.com/pustovitDmytro/logger-decorator
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[url-coverage]: https://coveralls.io/github/pustovitDmytro/logger-decorator?branch=master

[snyk-badge]: https://snyk-widget.herokuapp.com/badge/npm/logger-decorator/badge.svg
[snyk-url]: https://snyk.io/advisor/npm-package/logger-decorator

[tests-badge]: https://img.shields.io/circleci/build/github/pustovitDmytro/logger-decorator
[tests-url]: https://app.circleci.com/pipelines/github/pustovitDmytro/logger-decorator

[codefactor-badge]: https://www.codefactor.io/repository/github/pustovitdmytro/logger-decorator/badge
[codefactor-url]: https://www.codefactor.io/repository/github/pustovitdmytro/logger-decorator

[commit-activity-badge]: https://img.shields.io/github/commit-activity/m/pustovitDmytro/logger-decorator

[scrutinizer-badge]: https://scrutinizer-ci.com/g/pustovitDmytro/logger-decorator/badges/quality-score.png?b=master
[scrutinizer-url]: https://scrutinizer-ci.com/g/pustovitDmytro/logger-decorator/?branch=master

[codacy-badge]: https://app.codacy.com/project/badge/Grade/735696cc49164e52a890530e974e7377
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[sonarcloud-url]: https://sonarcloud.io/dashboard?id=pustovitDmytro_logger-decorator

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[npm-size-url]: https://bundlephobia.com/result?p=logger-decorator

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[node-ver-test-url]: https://github.com/pustovitDmytro/logger-decorator/actions?query=workflow%3A%22Node.js+versions%22

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[ukr-link]: https://war.ukraine.ua

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