simple-log-manager


> simple Node.js log manager with different outputs

Install

``
$ npm install simple-log-manager
`

Info

You can use 3 different output types:
1. File logger
2. Console logger
3. Dummy logger

Each logger has 4 methods for output - log, warn, info, error.

#### File logger
File loggers will write all output to file with logger name.

To create file logger you should specify logger name and 2 options:
fileName and dir.
> you can specify fileNamePattern instead of fileName:
`
{
fileNamePattern: "instance-.log",
dir: "../logs"
}
`

Example:
`javascript
var manager = require('simple-log-manager');

var options = {
fileNamePattern: "testName-.log",
dir: require('path').join(__dirname, "logs")
}

var logger = manager.createFileLogger("testName", options);

// now you can use log methods:
logger.log("Hello", "World", "!");
logger.warn("Hello", "World", "!");
logger.error("Hello", "World", "!");


//output testName-05_07.log:

14:19:38.038 LOG Hello World !
14:19:38.040 WARN Hello World !
14:19:38.041 ERROR Hello World !
`
---
#### Console logger
Console logger is simple js console instance. So all methods will output
to console.


Example:
`javascript
var manager = require('simple-log-manager');
var logger = manager.createConsoleLogger("testName");

logger.log("Hello", "World", "!"); // => "Hello World !"
logger.warn("Hello", "World", "!"); // => "Hello World !"
logger.error("Hello", "World", "!"); // => "Hello World !"
`
---
#### Dummy logger
Name speaks for itself. It's dummy logger with all
log method which will do nothing.

Example:
`javascript
var manager = require('simple-log-manager');
var logger = manager.createDummyLogger("testName");

logger.log("Hello", "World", "!"); // => nothing
logger.warn("Hello", "World", "!"); // => nothing
logger.error("Hello", "World", "!"); // => nothing
`
---

$3

You can create loggers in your entry file and get it deeper in your app

Example
`javascript
//main.js
var manager = require('simple-log-manager');

manager.createConsoleLogger("console");
manager.createFileLogger("file", {
fileName: "test",
dir: "logs"
});


//app.js
var logger = require('simple-log-manager').get("console");

//controller.js
var logger = require('simple-log-manager').get("file");
`
> you can remove already created logger: manager.remove(console)


Also you can switch between different output types with
any condition, e.g. with environment variable.

Example:
`javascript
const logger = (() => {
const manager = require('simple-log-manager');

if (process.env.LOG && Boolean(process.env.LOG) === false) {
return manager.createDummyLogger("instance");

}

if (Boolean(process.env.DEBUG)) {
return manager.createConsoleLogger("instance");
}

return manager.createFileLogger("instance", {
fileNamePattern: "instance-.log",
dir: require('path').join(__dirname, "..", "logs")
})
})();


logger.log("app was started");
...
logger.error("something went wrong!")
`

In the example above all application logs will prints to file in logs dir.
But if you need to debug you can pass DEBUG=true to environment and vualá -
all output is in your console. Also you can pass LOG=false` and all logs will
be disabled without any changes in source code.