Add package cluster :

- based on dragonboat lib (https://github.com/lni/dragonboat)
- add extended config with validate
- add backend managment to allow simple implementation for backend simple, cocurrent & disk
- has no backend implemented and must be a lib for a cluster mode of one backend

cluster/config.go

@@ -0,0 +1,83 @@
+/***********************************************************************************************************************
+ *
+ *   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 cluster
+
+import (
+	"fmt"
+
+	"github.com/go-playground/validator/v10"
+	dgbclt "github.com/lni/dragonboat/v3"
+	dgbcfg "github.com/lni/dragonboat/v3/config"
+	liberr "github.com/nabbar/golib/errors"
+)
+
+type Config struct {
+	Node       ConfigNode        `mapstructure:"node" json:"node" yaml:"node" toml:"node"`
+	Cluster    ConfigCluster     `mapstructure:"cluster" json:"cluster" yaml:"cluster" toml:"cluster"`
+	InitMember map[uint64]string `mapstructure:"init_member" json:"init_member" yaml:"init_member" toml:"init_member"`
+}
+
+func (c Config) GetDGBConfigCluster() dgbcfg.Config {
+	return c.Cluster.GetDGBConfigCluster()
+}
+
+func (c Config) GetDGBConfigNode() dgbcfg.NodeHostConfig {
+	return c.Node.GetDGBConfigNodeHost()
+}
+
+func (c Config) GetInitMember() map[uint64]dgbclt.Target {
+	var m = make(map[uint64]dgbclt.Target)
+
+	for k, v := range c.InitMember {
+		m[k] = v
+	}
+
+	return m
+}
+
+func (c Config) Validate() liberr.Error {
+	val := validator.New()
+	err := val.Struct(c)
+
+	if e, ok := err.(*validator.InvalidValidationError); ok {
+		return ErrorValidateConfig.ErrorParent(e)
+	}
+
+	out := ErrorValidateConfig.Error(nil)
+
+	for _, e := range err.(validator.ValidationErrors) {
+		//nolint goerr113
+		out.AddParent(fmt.Errorf("config field '%s' is not validated by constraint '%s'", e.Field(), e.ActualTag()))
+	}
+
+	if out.HasParent() {
+		return out
+	}
+
+	return nil
+}