chore: unify naming for node related types

internal/config/node.go

@@ -3,6 +3,7 @@ package config
 import (
 	"errors"
 	"fmt"
+	"net"
 	"strings"
 )
 
@@ -28,29 +29,34 @@ func (l *LogLevel) UnmarshalText(data []byte) error {
 }
 
 type NodeConfig struct {
-	Hostname          string   `toml:"hostname"`
-	Endpoint          string   `toml:"endpoint"`
+	Hostname string `toml:"hostname"`
+	Address  string `toml:"address"`
+	Port     int    `toml:"port"`
+
 	KeepaliveInterval int      `toml:"keepalive_interval"`
 	LogLevel          LogLevel `toml:"log_level"`
 
 	BootstrapMaster string `toml:"bootstrap_master"`
 	ListenOn        string `toml:"listen_on"`
-	Port            int    `toml:"port"`
 }
 
 func (c NodeConfig) Validate() error {
+	if c.Address == "" {
+		return errors.New("missing address")
+	}
+
 	if c.Hostname == "" {
 		return errors.New("missing hostname")
 	}
 
-	if c.Endpoint == "" {
-		return errors.New("missing endpoint")
-	}
-
 	if c.KeepaliveInterval < 1 && c.KeepaliveInterval != -1 {
 		return errors.New("invalid keepalive_interval")
 	}
 
+	if net.ParseIP(c.ListenOn) == nil {
+		return errors.New("invalid listen_on")
+	}
+
 	return nil
 }
 
@@ -59,8 +65,8 @@ func (c *NodeConfig) Merge(other NodeConfig) {
 		c.Hostname = other.Hostname
 	}
 
-	if other.Endpoint != "" {
-		c.Endpoint = other.Endpoint
+	if other.Address != "" {
+		c.Address = other.Address
 	}
 
 	if other.BootstrapMaster != "" {