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server.go
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server.go
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package metadata
import (
"fmt"
"net"
"regexp"
"strconv"
"strings"
"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
}
// Server is used to return details of a consul server
type Server struct {
Name string // <node>.<dc>
ShortName string // <node>
ID string
Datacenter string
Segment string
Port int
SegmentAddrs map[string]string
SegmentPorts map[string]int
WanJoinPort int
LanJoinPort int
Bootstrap bool
Expect int
Build version.Version
Version int
RaftVersion int
Addr net.Addr
Status serf.MemberStatus
ReadReplica bool
FeatureFlags map[string]int
// If true, use TLS when connecting to this server
UseTLS bool
}
// Key returns the corresponding Key
func (s *Server) Key() *Key {
return &Key{
name: s.Name,
}
}
// 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)
}
var versionFormat = regexp.MustCompile(`\d+\.\d+\.\d+`)
// 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"]
segment := m.Tags["segment"]
_, bootstrap := m.Tags["bootstrap"]
_, useTLS := m.Tags["use_tls"]
expect := 0
expectStr, ok := m.Tags["expect"]
var err error
if ok {
expect, err = strconv.Atoi(expectStr)
if err != nil {
return false, nil
}
}
portStr := m.Tags["port"]
port, err := strconv.Atoi(portStr)
if err != nil {
return false, nil
}
segmentAddrs := make(map[string]string)
segmentPorts := make(map[string]int)
featureFlags := make(map[string]int)
for name, value := range m.Tags {
if strings.HasPrefix(name, "sl_") {
addr, port, err := net.SplitHostPort(value)
if err != nil {
return false, nil
}
segmentPort, err := strconv.Atoi(port)
if err != nil {
return false, nil
}
segmentName := strings.TrimPrefix(name, "sl_")
segmentAddrs[segmentName] = addr
segmentPorts[segmentName] = segmentPort
} else if strings.HasPrefix(name, featureFlagPrefix) {
featureName := strings.TrimPrefix(name, featureFlagPrefix)
featureState, err := strconv.Atoi(value)
if err != nil {
return false, nil
}
featureFlags[featureName] = featureState
}
}
buildVersion, err := Build(&m)
if err != nil {
return false, nil
}
wanJoinPort := 0
wanJoinPortStr, ok := m.Tags["wan_join_port"]
if ok {
wanJoinPort, err = strconv.Atoi(wanJoinPortStr)
if err != nil {
return false, nil
}
}
vsnStr := m.Tags["vsn"]
vsn, err := strconv.Atoi(vsnStr)
if err != nil {
return false, nil
}
raftVsn := 0
raftVsnStr, ok := m.Tags["raft_vsn"]
if ok {
raftVsn, err = strconv.Atoi(raftVsnStr)
if err != nil {
return false, nil
}
}
// Check if the server is a non voter
// DEPRECATED - remove looking for the nonvoter tag eventually once we don't have to support
// read replicas running v1.8.x and below.
_, nonVoter := m.Tags["nonvoter"]
_, readReplica := m.Tags["read_replica"]
addr := &net.TCPAddr{IP: m.Addr, Port: port}
parts := &Server{
Name: m.Name,
ShortName: strings.TrimSuffix(m.Name, "."+datacenter),
ID: m.Tags["id"],
Datacenter: datacenter,
Segment: segment,
Port: port,
SegmentAddrs: segmentAddrs,
SegmentPorts: segmentPorts,
WanJoinPort: wanJoinPort,
LanJoinPort: int(m.Port),
Bootstrap: bootstrap,
Expect: expect,
Addr: addr,
Build: *buildVersion,
Version: vsn,
RaftVersion: raftVsn,
Status: m.Status,
UseTLS: useTLS,
// DEPRECATED - remove nonVoter check once support for that tag is removed
ReadReplica: nonVoter || readReplica,
FeatureFlags: featureFlags,
}
return true, parts
}
// TODO(ACL-Legacy-Compat): remove in phase 2
const TagACLs = "acls"
const featureFlagPrefix = "ft_"
// AddFeatureFlags to the tags. The tags map is expected to be a serf.Config.Tags.
// The feature flags are encoded in the tags so that IsConsulServer can decode them
// and populate the Server.FeatureFlags map.
func AddFeatureFlags(tags map[string]string, flags ...string) {
for _, flag := range flags {
tags[featureFlagPrefix+flag] = "1"
}
}