feat(log): Working on log library

log/hooks/gelf/config.go

@@ -0,0 +1,32 @@
+package gelf
+
+import (
+	"strconv"
+
+	"github.com/asaskevich/govalidator"
+	"github.com/juju/errors"
+)
+
+// ConfigStruct is the configuration for GELF Provider.
+type ConfigStruct struct {
+	Host         string                 `yaml:"host"`
+	Port         int                    `yaml:"port"`
+	ExtrasFields map[string]interface{} `yaml:"extra_fields"`
+}
+
+// IsValid will check that the Gelf configuration is valid.
+func (c *ConfigStruct) IsValid() error {
+	if c.Host == "" {
+		return errors.NotValidf("Host is empty in GELF configuration")
+	} else if !govalidator.IsDNSName(c.Host) && !govalidator.IsIP(c.Host) {
+		return errors.NotValidf("Host is invalid in GELF configuration. Should be a DNS name or an IP")
+	}
+
+	if c.Port == 0 {
+		return errors.NotValidf("Port is empty in GELF configuration")
+	} else if !govalidator.IsPort(strconv.Itoa(c.Port)) {
+		return errors.NotValidf("Port is invalid in GELF configuration")
+	}
+
+	return nil
+}

log/hooks/gelf/hook.go

@@ -0,0 +1,28 @@
+package gelf
+
+import (
+	"fmt"
+
+	"github.com/juju/errors"
+	"github.com/sirupsen/logrus"
+
+	graylog "github.com/gemnasium/logrus-graylog-hook/v3"
+)
+
+// NewHook will create a Gelf Hook for logrus.
+func NewHook(c *ConfigStruct) (logrus.Hook, error) {
+
+	err := c.IsValid()
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	hook := graylog.NewAsyncGraylogHook(
+		fmt.Sprintf("%s:%d", c.Host, c.Port),
+		c.ExtrasFields,
+	)
+
+	defer hook.Flush()
+
+	return hook, nil
+}