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node.go
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node.go
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/*
* MIT License
*
* Copyright (c) 2022-2023 Tochemey
*
* 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 discovery
import (
"net"
"os"
"strconv"
"github.com/caarlos0/env/v10"
)
// hostNodeConfig helps read the host Node settings
type hostNodeConfig struct {
GossipPort int `env:"GOSSIP_PORT"`
ClusterPort int `env:"CLUSTER_PORT"`
RemotingPort int `env:"REMOTING_PORT"`
Name string `env:"NODE_NAME" envDefault:""`
Host string `env:"NODE_IP" envDefault:""`
}
// Node represents a discovered Node
type Node struct {
// Name specifies the discovered node's Name
Name string
// Host specifies the discovered node's Host
Host string
// GossipPort
GossipPort int
// ClusterPort
ClusterPort int
// RemotingPort
RemotingPort int
}
// ClusterAddress returns address the node's peers will use to connect to
func (n Node) ClusterAddress() string {
return net.JoinHostPort(n.Host, strconv.Itoa(n.ClusterPort))
}
// GossipAddress returns the node discovery address
func (n Node) GossipAddress() string {
return net.JoinHostPort(n.Host, strconv.Itoa(n.GossipPort))
}
// HostNode returns the Node where the discovery provider is running
func HostNode() (*Node, error) {
// load the host node configuration
cfg := &hostNodeConfig{}
opts := env.Options{RequiredIfNoDef: true, UseFieldNameByDefault: false}
if err := env.ParseWithOptions(cfg, opts); err != nil {
return nil, err
}
// check for empty host and name
if cfg.Host == "" {
// let us perform a host lookup
host, _ := os.Hostname()
// set the host
cfg.Host = host
}
// set the name as host if it is empty
if cfg.Name == "" {
cfg.Name = cfg.Host
}
// create the host node
return &Node{
Name: cfg.Name,
Host: cfg.Host,
GossipPort: cfg.GossipPort,
ClusterPort: cfg.ClusterPort,
RemotingPort: cfg.RemotingPort,
}, nil
}