huzzah

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very fast and dead simple hierarchical text logger.

// repository documentation

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# Huzzah

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You can finally say - Huzzah!!!

It is one of the fastest and dead simple hierarchical text logger.

Let step by step explain what does it mean.

## One of fastests

```
$ node benchmark/json.js
huzzah-fast-time.info json format x 988,555 ops/sec ±0.92% (89 runs sampled)
huzzah.info json format x 482,806 ops/sec ±2.96% (82 runs sampled)
huzzah.info empty x 1,468,626 ops/sec ±1.66% (85 runs sampled)
huzzah.info no format x 1,612,675 ops/sec ±1.43% (85 runs sampled)
bunyan.info x 281,758 ops/sec ±2.04% (85 runs sampled)
pino.info x 735,848 ops/sec ±0.72% (93 runs sampled)
pino-fast-time.info x 1,217,475 ops/sec ±1.10% (88 runs sampled)

$ node benchmark/logging.js
huzzah.info text format x 953,088 ops/sec ±0.96% (89 runs sampled)
huzzah.info json format x 548,774 ops/sec ±0.97% (90 runs sampled)
huzzah.info raw logger x 1,840,130 ops/sec ±0.76% (90 runs sampled)
winston.info x 68,487 ops/sec ±16.17% (56 runs sampled)
intel.info x 141,388 ops/sec ±4.93% (76 runs sampled)
bunyan.info x 209,748 ops/sec ±3.09% (66 runs sampled)
log4js.info x 636,488 ops/sec ±1.52% (81 runs sampled)
pino.info x 424,048 ops/sec ±2.76% (83 runs sampled)
(node:672) (pino) `slowtime` is deprecated: use `timestamp: pino.stdTimeFunctions.slowTime`
```

## Dead simple

In usage:

```js
var logger = require("huzzah").get("some_logger");

logger.trace("Some error can happen %s", "argument");
```

But we still need some configuration what and where to output:

```js
var ConsoleHandler = require("huzzah/handlers").ConsoleHandler;

// require("huzzah") returns default logger factory instance
// which contains loggers and their settings
require("huzzah")
  // get settings of logger with name 'root'
  .settings("root") // see hierarchical section about what root mean (it is parent of all loggers)
  // output every log message to console, from all loggers (.addHandler call can be chained)
  .addHandler(new ConsoleHandler());
```

## Hierarchical loggers

All loggers have string names. We can create chain of loggers by separating its name with dots. For example if we have
logger with name `a.b.c` than its parents will be `a.b`, `a` and `root`.

That means you can configure some parent loggers and all nested loggers will reuse thier settings. In simple case you
can configure only **root** logger as single configuration point.

## How to use

1. Install

```
   npm install --save huzzah
   ```

2. Configure

```js
   var huzzah = require("huzzah");

// get settings of some loggers
   var settingsOfRootLogger = huzzah.settings("root");

settingsOfRootLogger
     // let add console handler
     .addHandler(new ConsoleHandler())
     // let add output to file
     .addHandler(new StreamHandler().setStream(fs.createWriteStream("debug.log")));
   ```

See [API.md](https://github.com/btd/huzzah/edit/master/API.md) for more info.

3. Use

```js
   var logger = require("huzzah").get("some_logger");

logger.error("Some error happen", err);
   ```

## FAQ

1. I need logger to reject all records with log level < INFO.

```js
   // settings it is LoggerSettings (what is returned by LoggerFactory#settings)
   settings.setLevel("INFO");
   ```

2. I want my own format of records

```js
   handler.setFormat("%date %msg%n");
   ```

3. I want to produce JSON

```js
   var jsonFormat = require("huzzah/json-format");
   handler.setFormat(jsonFormat());

//jsonFormat can accept bunyan style serializers
   ```

4. I want to add more fields to record (for JSON output)

```js
   logger.with({ req, res }).info("Some message");
   ```

With such way you can use it with express like:

```
   app.use((req, res, next) => {
     req.logger = logger.with({ req, res, req_id: uuid() });
   });
   ```

And use req.logger to output additional context information.

# license

MIT

huzzah

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