micro/registry/consul_registry.go

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package registry
import (
"encoding/json"
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"errors"
"fmt"
"net"
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"sync"
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consul "github.com/hashicorp/consul/api"
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)
type consulRegistry struct {
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Address string
Client *consul.Client
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mtx sync.RWMutex
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services map[string][]*Service
}
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func encodeEndpoints(en []*Endpoint) []string {
var tags []string
for _, e := range en {
if b, err := json.Marshal(e); err == nil {
tags = append(tags, "e="+string(b))
}
}
return tags
}
func decodeEndpoints(tags []string) []*Endpoint {
var en []*Endpoint
for _, tag := range tags {
if len(tag) == 0 || tag[0] != 'e' {
continue
}
var e *Endpoint
if err := json.Unmarshal([]byte(tag[2:]), &e); err == nil {
en = append(en, e)
}
}
return en
}
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func encodeMetadata(md map[string]string) []string {
var tags []string
for k, v := range md {
if b, err := json.Marshal(map[string]string{
k: v,
}); err == nil {
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tags = append(tags, "t="+string(b))
}
}
return tags
}
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func decodeMetadata(tags []string) map[string]string {
md := make(map[string]string)
for _, tag := range tags {
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if len(tag) == 0 || tag[0] != 't' {
continue
}
var kv map[string]string
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if err := json.Unmarshal([]byte(tag[2:]), &kv); err == nil {
for k, v := range kv {
md[k] = v
}
}
}
return md
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}
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func newConsulRegistry(addrs []string, opts ...Option) Registry {
config := consul.DefaultConfig()
if len(addrs) > 0 {
addr, port, err := net.SplitHostPort(addrs[0])
if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
port = "8500"
config.Address = fmt.Sprintf("%s:%s", addr, port)
} else if err == nil {
config.Address = fmt.Sprintf("%s:%s", addr, port)
}
}
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client, _ := consul.NewClient(config)
cr := &consulRegistry{
Address: config.Address,
Client: client,
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services: make(map[string][]*Service),
}
return cr
}
func (c *consulRegistry) Deregister(s *Service) error {
if len(s.Nodes) == 0 {
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return errors.New("Require at least one node")
}
node := s.Nodes[0]
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_, err := c.Client.Catalog().Deregister(&consul.CatalogDeregistration{
Node: node.Id,
Address: node.Address,
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}, nil)
return err
}
func (c *consulRegistry) Register(s *Service) error {
if len(s.Nodes) == 0 {
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return errors.New("Require at least one node")
}
node := s.Nodes[0]
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tags := encodeMetadata(node.Metadata)
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tags = append(tags, encodeEndpoints(s.Endpoints)...)
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_, err := c.Client.Catalog().Register(&consul.CatalogRegistration{
Node: node.Id,
Address: node.Address,
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Service: &consul.AgentService{
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ID: s.Version,
Service: s.Name,
Port: node.Port,
Tags: tags,
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},
}, nil)
return err
}
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func (c *consulRegistry) GetService(name string) ([]*Service, error) {
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c.mtx.RLock()
service, ok := c.services[name]
c.mtx.RUnlock()
if ok {
return service, nil
}
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rsp, _, err := c.Client.Catalog().Service(name, "", nil)
if err != nil {
return nil, err
}
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serviceMap := map[string]*Service{}
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for _, s := range rsp {
if s.ServiceName != name {
continue
}
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id := s.Node
key := s.ServiceID
version := s.ServiceID
// We're adding service version but
// don't want to break backwards compatibility
if id == version {
key = "default"
version = ""
}
svc, ok := serviceMap[key]
if !ok {
svc = &Service{
Endpoints: decodeEndpoints(s.ServiceTags),
Name: s.ServiceName,
Version: version,
}
serviceMap[key] = svc
}
svc.Nodes = append(svc.Nodes, &Node{
Id: id,
Address: s.Address,
Port: s.ServicePort,
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Metadata: decodeMetadata(s.ServiceTags),
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})
}
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var services []*Service
for _, service := range serviceMap {
services = append(services, service)
}
return services, nil
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}
func (c *consulRegistry) ListServices() ([]*Service, error) {
c.mtx.RLock()
serviceMap := c.services
c.mtx.RUnlock()
var services []*Service
if len(serviceMap) > 0 {
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for _, service := range serviceMap {
services = append(services, service...)
}
return services, nil
}
rsp, _, err := c.Client.Catalog().Services(&consul.QueryOptions{})
if err != nil {
return nil, err
}
for service, _ := range rsp {
services = append(services, &Service{Name: service})
}
return services, nil
}
func (c *consulRegistry) Watch() (Watcher, error) {
return newConsulWatcher(c)
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}