- Remove logger as globals to use dedicated pointer (#104)

# Refactor Logger :
- Remove logger as globals to use dedicated pointer
- Add compat file to allow retro-compatibility (function are deprecated)
- Add field management to allow add custom information
- Add option struct to manage options
- Add entry struct to manage all log entry
- Add multithreading capabilities (with race prevention)
- Allow to log to file + stdout/stderr + syslog
- Add io.WriteCloser compatibility interface
- Add logrus hook to manage option by hook instance
- Add capabilities to custom each logfile/syslog/standard independently
- Add small test suite

# Update Packages for logger new options : 
- archive
- cluster
- context
- httpcli
- httpserver
- ldap
- tests

# Other : 
- bump dependancies
- update minio server for aws test

logger/hooksyslog.go

@@ -0,0 +1,143 @@
+/***********************************************************************************************************************
+ *
+ *   MIT License
+ *
+ *   Copyright (c) 2021 Nicolas JUHEL
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in all
+ *   copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *   SOFTWARE.
+ *
+ *
+ **********************************************************************************************************************/
+
+package logger
+
+import (
+	"fmt"
+	"io"
+	"log/syslog"
+
+	"github.com/sirupsen/logrus"
+)
+
+type HookSyslog interface {
+	logrus.Hook
+	io.WriteCloser
+	RegisterHook(log *logrus.Logger)
+}
+
+type _HookSyslog struct {
+	w *syslog.Writer
+	l []logrus.Level
+	s bool
+	d bool
+	t bool
+}
+
+func NewHookSyslog(opt OptionsSyslog) (HookSyslog, error) {
+	var (
+		LVLs = make([]logrus.Level, 0)
+		sys  *syslog.Writer
+		err  error
+	)
+
+	if len(opt.LogLevel) > 0 {
+		for _, ls := range opt.LogLevel {
+			LVLs = append(LVLs, GetLevelString(ls).Logrus())
+		}
+	} else {
+		LVLs = logrus.AllLevels
+	}
+
+	if sys, err = syslog.Dial(opt.Network.String(), opt.Host, opt.Priority, opt.Tag); err != nil {
+		return nil, err
+	}
+
+	return &_HookSyslog{
+		w: sys,
+		l: LVLs,
+		s: opt.DisableStack,
+		d: opt.DisableTimestamp,
+		t: opt.EnableTrace,
+	}, nil
+}
+
+func (o *_HookSyslog) RegisterHook(log *logrus.Logger) {
+	log.AddHook(o)
+}
+
+func (o *_HookSyslog) Levels() []logrus.Level {
+	return o.l
+}
+
+func (o *_HookSyslog) Fire(entry *logrus.Entry) error {
+	ent := entry.Dup()
+
+	if o.s {
+		ent.Data = o.filterKey(ent.Data, FieldStack)
+	}
+
+	if o.d {
+		ent.Data = o.filterKey(ent.Data, FieldTime)
+	}
+
+	if !o.t {
+		ent.Data = o.filterKey(ent.Data, FieldCaller)
+		ent.Data = o.filterKey(ent.Data, FieldFile)
+		ent.Data = o.filterKey(ent.Data, FieldLine)
+	}
+
+	if p, err := ent.Bytes(); err != nil {
+		return err
+	} else if _, err = o.Write(p); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (o *_HookSyslog) Write(p []byte) (n int, err error) {
+	if o.w == nil {
+		return 0, fmt.Errorf("logrus.hooksyslog: connection not setup")
+	}
+
+	return o.w.Write(p)
+}
+
+func (o *_HookSyslog) Close() error {
+	err := o.w.Close()
+	o.w = nil
+	return err
+}
+
+func (o *_HookSyslog) filterKey(f logrus.Fields, key string) logrus.Fields {
+	if len(f) < 1 {
+		return f
+	}
+
+	var res = make(map[string]interface{}, 0)
+
+	for k, v := range f {
+		if k == key {
+			continue
+		}
+		res[k] = v
+	}
+
+	return res
+}