feat: parse level from string (#11)

* Read log level from env var

* Fixes #9.

* With these changes, the log level will be able to read from the env var with
`LOG_LEVEL` key.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Replace os.Getenv with t.Getenv

* Update .gitignore.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Add `WithLevelFromString` option

* `readLevelFromEnv` function is removed.

* Tests updated.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Add `ParseLevel` function

* This function converts string to Level type.

* Unit test implemented.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Remove switch-case blocks

* Replace swich-case blocks with `ParseLevel` function in `WithLevelFromString`.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Remove `WithLevelFromString` option

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Update tests

* Revert changes in `log_test.go`.

* Update test cases in `level_test.go`.

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Remove empty line

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Remove env var related test cases

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

* Remove unneeded line

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

---------

Signed-off-by: Gökhan Özeloğlu <gokhan.ozeloglu@deliveryhero.com>

level.go

@@ -1,5 +1,7 @@
 package log
 
+import "strings"
+
 // Level is a logging level.
 type Level int32
 
@@ -35,3 +37,21 @@ func (l Level) String() string {
  return ""
  }
 }
+
+// ParseLevel converts level in string to Level type. Default level is InfoLevel.
+func ParseLevel(level string) Level {
+ switch strings.ToLower(level) {
+ case DebugLevel.String():
+ return DebugLevel
+ case InfoLevel.String():
+ return InfoLevel
+ case WarnLevel.String():
+ return WarnLevel
+ case ErrorLevel.String():
+ return ErrorLevel
+ case FatalLevel.String():
+ return FatalLevel
+ default:
+ return InfoLevel
+ }
+}

level_test.go

@@ -10,3 +10,52 @@ func TestDefaultLevel(t *testing.T) {
  var level Level
  assert.Equal(t, InfoLevel, level)
 }
+func TestParseLevel(t *testing.T) {
+ testCases := []struct {
+ name string
+ level string
+ expLevel Level
+ }{
+ {
+ name: "Parse debug",
+ level: "debug",
+ expLevel: DebugLevel,
+ },
+ {
+ name: "Parse info",
+ level: "Info",
+ expLevel: InfoLevel,
+ },
+ {
+ name: "Parse warn",
+ level: "WARN",
+ expLevel: WarnLevel,
+ },
+ {
+ name: "Parse error",
+ level: "error",
+ expLevel: ErrorLevel,
+ },
+ {
+ name: "Parse fatal",
+ level: "FATAL",
+ expLevel: FatalLevel,
+ },
+ {
+ name: "Default",
+ level: "",
+ expLevel: InfoLevel,
+ },
+ {
+ name: "Wrong level, set INFO",
+ level: "WRONG_LEVEL",
+ expLevel: InfoLevel,
+ },
+ }
+
+ for _, tc := range testCases {
+ t.Run(tc.name, func(t *testing.T) {
+ assert.Equal(t, tc.expLevel, ParseLevel(tc.level))
+ })
+ }
+}