open-consul/consul/agent/server.go

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// Package agent provides a logical endpoint for Consul agents in the
// network. agent data originates from Serf gossip and is primarily used to
// communicate Consul server information. Gossiped information that ends up
// in Server contains the necessary metadata required for servers.Manager to
// select which server an RPC request should be routed to.
package agent
import (
"fmt"
"net"
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"regexp"
"strconv"
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"github.com/hashicorp/go-version"
"github.com/hashicorp/serf/serf"
)
// Key is used in maps and for equality tests. A key is based on endpoints.
type Key struct {
name string
}
// Equal compares two Key objects
func (k *Key) Equal(x *Key) bool {
return k.name == x.name
}
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// Server is used to return details of a consul server
type Server struct {
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Name string
ID string
Datacenter string
Port int
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WanJoinPort int
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Bootstrap bool
Expect int
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Build version.Version
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Version int
RaftVersion int
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NonVoter bool
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Addr net.Addr
Status serf.MemberStatus
// If true, use TLS when connecting to this server
UseTLS bool
}
// Key returns the corresponding Key
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func (s *Server) Key() *Key {
return &Key{
name: s.Name,
}
}
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// String returns a string representation of Server
func (s *Server) String() string {
var addrStr, networkStr string
if s.Addr != nil {
addrStr = s.Addr.String()
networkStr = s.Addr.Network()
}
return fmt.Sprintf("%s (Addr: %s/%s) (DC: %s)", s.Name, networkStr, addrStr, s.Datacenter)
}
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var versionFormat = regexp.MustCompile(`\d+\.\d+\.\d+`)
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// IsConsulServer returns true if a serf member is a consul server
// agent. Returns a bool and a pointer to the Server.
func IsConsulServer(m serf.Member) (bool, *Server) {
if m.Tags["role"] != "consul" {
return false, nil
}
datacenter := m.Tags["dc"]
_, bootstrap := m.Tags["bootstrap"]
_, useTLS := m.Tags["use_tls"]
expect := 0
expect_str, ok := m.Tags["expect"]
var err error
if ok {
expect, err = strconv.Atoi(expect_str)
if err != nil {
return false, nil
}
}
port_str := m.Tags["port"]
port, err := strconv.Atoi(port_str)
if err != nil {
return false, nil
}
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build_version, err := version.NewVersion(versionFormat.FindString(m.Tags["build"]))
if err != nil {
return false, nil
}
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wan_join_port := 0
wan_join_port_str, ok := m.Tags["wan_join_port"]
if ok {
wan_join_port, err = strconv.Atoi(wan_join_port_str)
if err != nil {
return false, nil
}
}
vsn_str := m.Tags["vsn"]
vsn, err := strconv.Atoi(vsn_str)
if err != nil {
return false, nil
}
raft_vsn := 0
raft_vsn_str, ok := m.Tags["raft_vsn"]
if ok {
raft_vsn, err = strconv.Atoi(raft_vsn_str)
if err != nil {
return false, nil
}
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}
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_, nonVoter := m.Tags["nonvoter"]
addr := &net.TCPAddr{IP: m.Addr, Port: port}
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parts := &Server{
Name: m.Name,
ID: m.Tags["id"],
Datacenter: datacenter,
Port: port,
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WanJoinPort: wan_join_port,
Bootstrap: bootstrap,
Expect: expect,
Addr: addr,
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Build: *build_version,
Version: vsn,
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RaftVersion: raft_vsn,
Status: m.Status,
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NonVoter: nonVoter,
UseTLS: useTLS,
}
return true, parts
}