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# wlog
Simple log level based Go logger.
Provides an io.Writer that filters log messages based on a log level prefix.
Valid log levels are: DEBUG, INFO, WARN, ERROR, OFF.
Log messages need to begin with a L! where L is one of D, I, W, or E.
## Usage
Create a *log.Logger via wlog.New:
```go
package main
import (
"log"
"os"
"github.com/influxdata/wlog"
)
func main() {
var logger *log.Logger
logger = wlog.New(os.Stderr, "prefix", log.LstdFlags)
logger.Println("I! initialized logger")
}
```
Create a *log.Logger explicitly using wlog.Writer:
```go
package main
import (
"log"
"os"
"github.com/influxdata/wlog"
)
func main() {
var logger *log.Logger
logger = log.New(wlog.NewWriter(os.Stderr), "prefix", log.LstdFlags)
logger.Println("I! initialized logger")
}
```
Prefix log messages with a log level char and the `!` delimiter.
```go
logger.Println("D! this is a debug log")
logger.Println("I! this is an info log")
logger.Println("W! this is a warn log")
logger.Println("E! this is an error log")
```
The log level can be changed via the SetLevel or the SetLevelFromName functions.
```go
package main
import (
"log"
"os"
"github.com/influxdata/wlog"
)
func main() {
var logger *log.Logger
logger = wlog.New(os.Stderr, "prefix", log.LstdFlags)
wlog.SetLevel(wlog.DEBUG)
logger.Println("D! initialized logger")
wlog.SetLevelFromName("INFO")
logger.Println("D! this message will be dropped")
logger.Println("I! this message will be printed")
}
```
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