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本文主要研究一下dubbo-go-proxy的ConsulRegistryLoad
Loader
dubbo-go-proxy/pkg/registry/load.go
// Loader this interface defined for load services from different kinds registry, such as nacos,consul,zookeeper.
type Loader interface {
// LoadAllServices load all services registered in registry
LoadAllServices() ([]*common.URL, error)
// GetCluster get the registry name
GetCluster() (string, error)
}Loader接口定义了LoadAllServices、GetCluster方法
ConsulRegistryLoad
dubbo-go-proxy/pkg/registry/consul.go
func init() {
var _ Loader = new(ConsulRegistryLoad)
}
const (
dubboAPIFilter = "dubbo in Tags"
)
// ConsulRegistryLoad load dubbo apis from consul registry
type ConsulRegistryLoad struct {
Address string
// Consul client.
client *consul.Client
cluster string
}
func newConsulRegistryLoad(address, cluster string) (Loader, error) {
config := &consul.Config{Address: address}
client, err := consul.NewClient(config)
if err != nil {
return nil, err
}
r := &ConsulRegistryLoad{
Address: address,
client: client,
cluster: cluster,
}
return r, nil
}ConsulRegistryLoad定义了Address、client、cluster属性；newConsulRegistryLoad方法根据address及cluster来创建ConsulRegistryLoad
GetCluster
dubbo-go-proxy/pkg/registry/consul.go
func (crl *ConsulRegistryLoad) GetCluster() (string, error) {
return crl.cluster, nil
}GetCluster方法返回ConsulRegistryLoad的cluster属性
LoadAllServices
dubbo-go-proxy/pkg/registry/consul.go
func (crl *ConsulRegistryLoad) LoadAllServices() ([]*common.URL, error) {
agentServices, err := crl.client.Agent().ServicesWithFilter(dubboAPIFilter)
if err != nil {
logger.Error("consul load all apis error:%v", err)
return nil, perrors.Wrap(err, "consul load all apis")
}
var urls []*common.URL
for _, service := range agentServices {
url, err := crl.transfer2Url(*service)
if err != nil {
logger.Warnf("consul transfer service to url error:%v", err)
continue
}
urls = append(urls, url)
}
return urls, nil
}LoadAllServices方法通过ConsulRegistryLoad的client.Agent().ServicesWithFilter来获取agentServices，之后遍历agentServices通过transfer2Url方法转换为url
transfer2Url
dubbo-go-proxy/pkg/registry/consul.go
func (crl *ConsulRegistryLoad) transfer2Url(service consul.AgentService) (*common.URL, error) {
var params = url.Values{}
var protocol string
for _, tag := range service.Tags {
kv := strings.Split(tag, "=")
if len(kv) != 2 {
continue
}
params.Add(kv[0], kv[1])
}
if url, ok := service.Meta["url"]; ok {
protocol = strings.Split(url, ":")[0]
}
methodsParam := strings.Split(params.Get(constant.METHODS_KEY), ",")
var methods = make([]string, len(methodsParam))
for _, method := range methodsParam {
if method != "" {
methods = append(methods, method)
}
}
url := common.NewURLWithOptions(common.WithPort(strconv.Itoa(service.Port)),
common.WithProtocol(protocol), common.WithMethods(methods),
common.WithIp(service.Address), common.WithParams(params))
return url, nil
}transfer2Url方法遍历service.Tags追加到params，之后解析service.Meta["url"]，再解析params.Get(constant.METHODS_KEY)，最后通过common.NewURLWithOptions构建url
小结
ConsulRegistryLoad定义了Address、client、cluster属性；newConsulRegistryLoad方法根据address及cluster来创建ConsulRegistryLoad；它实现了Loader接口，提供了GetCluster、LoadAllServices方法。
doc
- dubbo-go-proxy
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