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registrator.go
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registrator.go
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package registry
import (
"fmt"
"strings"
"sync"
"github.com/go-chassis/go-chassis/core/config"
"github.com/go-chassis/go-chassis/core/lager"
"log"
)
// constant values for registry parameters
const (
DefaultRegistratorPlugin = "servicecenter"
DefaultServiceDiscoveryPlugin = "servicecenter"
DefaultContractDiscoveryPlugin = "servicecenter"
Name = "registry"
SDTag = "serviceDiscovery"
CDTag = "contractDiscovery"
RTag = "registrator"
Auto = "auto"
Manual = "manual"
)
// IsEnabled check enable
var IsEnabled bool
var mu sync.Mutex
// DefaultRegistrator is the client of registry, you can call the method of it to interact with microservice registry
var DefaultRegistrator Registrator
// DefaultAddr default address of service center
var DefaultAddr = "http://127.0.0.1:30100"
// registryFunc registry function
var registryFunc = make(map[string]func(opts Options) Registrator)
// HBService variable of heartbeat service
var HBService = &HeartbeatService{
instances: make(map[string]*HeartbeatTask),
}
// Registrator is the interface for developer to update information in service registry
type Registrator interface {
//Close destroy connection between the registry client and server
Close() error
//RegisterService register a microservice to registry, if it is duplicated in registry, it returns error
RegisterService(microService *MicroService) (string, error)
//RegisterServiceInstance register a microservice instance to registry
RegisterServiceInstance(sid string, instance *MicroServiceInstance) (string, error)
RegisterServiceAndInstance(microService *MicroService, instance *MicroServiceInstance) (string, string, error)
Heartbeat(microServiceID, microServiceInstanceID string) (bool, error)
AddDependencies(dep *MicroServiceDependency) error
UnRegisterMicroServiceInstance(microServiceID, microServiceInstanceID string) error
UpdateMicroServiceInstanceStatus(microServiceID, microServiceInstanceID, status string) error
UpdateMicroServiceProperties(microServiceID string, properties map[string]string) error
UpdateMicroServiceInstanceProperties(microServiceID, microServiceInstanceID string, properties map[string]string) error
AddSchemas(microServiceID, schemaName, schemaInfo string) error
}
func enableRegistrator(opts Options) {
if config.GetRegistratorDisable() {
return
}
rt := config.GetRegistratorType()
if rt == "" {
rt = DefaultRegistratorPlugin
}
f := registryFunc[rt]
if f == nil {
panic("No registry plugin")
}
DefaultRegistrator = f(opts)
if err := RegisterMicroservice(); err != nil {
lager.Logger.Errorf(err, "start bacskoff for register microservice")
startBackOff(RegisterMicroservice)
}
go HBService.Start()
lager.Logger.Infof("Enable [%s] registrator.", rt)
}
// InstallRegistrator install registrator plugin
func InstallRegistrator(name string, f func(opts Options) Registrator) {
registryFunc[name] = f
log.Printf("Installed registry plugin: %s.\n", name)
}
func getSpecifiedOptions() (oR, oSD, oCD Options, err error) {
hostsR, schemeR, err := URIs2Hosts(strings.Split(config.GetRegistratorAddress(), ","))
if err != nil {
return
}
oR.Addrs = hostsR
oR.Tenant = config.GetRegistratorTenant()
oR.Version = config.GetRegistratorAPIVersion()
oR.TLSConfig, err = getTLSConfig(schemeR, RTag)
if err != nil {
return
}
if oR.TLSConfig != nil {
oR.EnableSSL = true
}
hostsSD, schemeSD, err := URIs2Hosts(strings.Split(config.GetServiceDiscoveryAddress(), ","))
if err != nil {
return
}
oSD.Addrs = hostsSD
oSD.Tenant = config.GetServiceDiscoveryTenant()
oSD.Version = config.GetServiceDiscoveryAPIVersion()
oSD.ConfigPath = config.GetServiceDiscoveryConfigPath()
oSD.TLSConfig, err = getTLSConfig(schemeSD, SDTag)
if err != nil {
return
}
if oSD.TLSConfig != nil {
oSD.EnableSSL = true
}
hostsCD, schemeCD, err := URIs2Hosts(strings.Split(config.GetContractDiscoveryAddress(), ","))
if err != nil {
return
}
oCD.Addrs = hostsCD
oCD.Tenant = config.GetContractDiscoveryTenant()
oCD.Version = config.GetContractDiscoveryAPIVersion()
oCD.TLSConfig, err = getTLSConfig(schemeCD, CDTag)
if err != nil {
return
}
if oCD.TLSConfig != nil {
oCD.EnableSSL = true
}
return
}
// Enable create DefaultRegistrator
func Enable() (err error) {
mu.Lock()
defer mu.Unlock()
if IsEnabled {
return
}
var oR, oSD, oCD Options
if oR, oSD, oCD, err = getSpecifiedOptions(); err != nil {
return err
}
enableRegistryCache()
enableRegistrator(oR)
enableServiceDiscovery(oSD)
enableContractDiscovery(oCD)
lager.Logger.Info("Enabled Registry")
IsEnabled = true
return nil
}
// DoRegister for registering micro-service instances
func DoRegister() error {
var (
isAutoRegister bool
t = config.GetRegistratorAutoRegister()
)
switch t {
case "":
isAutoRegister = true
case Auto:
isAutoRegister = true
case Manual:
isAutoRegister = false
default:
{
tmpErr := fmt.Errorf("parameter incorrect, autoregister: %s", t)
lager.Logger.Error(tmpErr.Error(), nil)
return tmpErr
}
}
if isAutoRegister {
if err := RegisterMicroserviceInstances(); err != nil {
lager.Logger.Errorf(err, "start back off for register microservice instances background")
go startBackOff(RegisterMicroserviceInstances)
}
}
return nil
}