Nacos-sdk-go 中文

---

Nacos-sdk-go

Nacos-sdk-go for Go client allows you to access Nacos service,it supports service discovery and dynamic configuration.

Requirements

Supported Go version over 1.15

Supported Nacos version over 2.x

Installation

Use go get to install SDK：

$ go get -u github.com/nacos-group/nacos-sdk-go/v2

Quick Examples

• ClientConfig

constant.ClientConfig{
TimeoutMs            uint64 // timeout for requesting Nacos server, default value is 10000ms
NamespaceId          string // the namespaceId of Nacos
Endpoint             string // the endpoint for ACM. https://help.aliyun.com/document_detail/130146.html
RegionId             string // the regionId for ACM & KMS
AccessKey            string // the AccessKey for ACM & KMS
SecretKey            string // the SecretKey for ACM & KMS
OpenKMS              bool   // it's to open KMS, default is false. https://help.aliyun.com/product/28933.html
// , to enable encrypt/decrypt, DataId should be start with "cipher-"
CacheDir             string // the directory for persist nacos service info,default value is current path
UpdateThreadNum      int    // the number of goroutine for update nacos service info,default value is 20
NotLoadCacheAtStart  bool   // not to load persistent nacos service info in CacheDir at start time
UpdateCacheWhenEmpty bool   // update cache when get empty service instance from server
Username             string // the username for nacos auth
Password             string // the password for nacos auth
LogDir               string // the directory for log, default is current path
RotateTime           string // the rotate time for log, eg: 30m, 1h, 24h, default is 24h
MaxAge               int64  // the max age of a log file, default value is 3
LogLevel             string // the level of log, it's must be debug,info,warn,error, default value is info
}

• ServerConfig

constant.ServerConfig{
Scheme      string // the nacos server scheme,defaut=http,this is not required in 2.0 
ContextPath string // the nacos server contextpath,defaut=/nacos,this is not required in 2.0 
IpAddr      string // the nacos server address 
Port        uint64 // nacos server port
GrpcPort    uint64 // nacos server grpc port, default=server port + 1000, this is not required
}

Note：We can config multiple ServerConfig,the client will rotate request the servers

Create client

//create clientConfig
clientConfig := constant.ClientConfig{
NamespaceId:         "e525eafa-f7d7-4029-83d9-008937f9d468", //we can create multiple clients with different namespaceId to support multiple namespace.When namespace is public, fill in the blank string here.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
TimeoutMs:           5000,
NotLoadCacheAtStart: true,
LogDir:              "/tmp/nacos/log",
CacheDir:            "/tmp/nacos/cache",
LogLevel:            "debug",
}
//Another way of create clientConfig
clientConfig := *constant.NewClientConfig(
constant.WithNamespaceId("e525eafa-f7d7-4029-83d9-008937f9d468"), //When namespace is public, fill in the blank string here.
constant.WithTimeoutMs(5000),
constant.WithNotLoadCacheAtStart(true),
constant.WithLogDir("/tmp/nacos/log"),
constant.WithCacheDir("/tmp/nacos/cache"),
constant.WithLogLevel("debug"),
)

// At least one ServerConfig
serverConfigs := []constant.ServerConfig{
{
IpAddr:      "console1.nacos.io",
ContextPath: "/nacos",
Port:        80,
Scheme:      "http",
},
{
IpAddr:      "console2.nacos.io",
ContextPath: "/nacos",
Port:        80,
Scheme:      "http",
},
}
//Another way of create serverConfigs
serverConfigs := []constant.ServerConfig{
*constant.NewServerConfig(
"console1.nacos.io",
80,
constant.WithScheme("http"),
constant.WithContextPath("/nacos")
),
*constant.NewServerConfig(
"console2.nacos.io",
80,
constant.WithScheme("http"),
constant.WithContextPath("/nacos")
),
}

// Create naming client for service discovery
_, _ := clients.CreateNamingClient(map[string]interface{}{
"serverConfigs": serverConfigs,
"clientConfig":  clientConfig,
})

// Create config client for dynamic configuration
_, _ := clients.CreateConfigClient(map[string]interface{}{
"serverConfigs": serverConfigs,
"clientConfig":  clientConfig,
})

// Another way of create naming client for service discovery (recommend)
namingClient, err := clients.NewNamingClient(
vo.NacosClientParam{
ClientConfig:  &clientConfig,
ServerConfigs: serverConfigs,
},
)

// Another way of create config client for dynamic configuration (recommend)
configClient, err := clients.NewConfigClient(
vo.NacosClientParam{
ClientConfig:  &clientConfig,
ServerConfigs: serverConfigs,
},
)

Create client for ACM

https://help.aliyun.com/document_detail/130146.html

cc := constant.ClientConfig{
Endpoint:    "acm.aliyun.com:8080",
NamespaceId: "e525eafa-f7d7-4029-83d9-008937f9d468",
RegionId:    "cn-shanghai",
AccessKey:   "LTAI4G8KxxxxxxxxxxxxxbwZLBr",
SecretKey:   "n5jTL9YxxxxxxxxxxxxaxmPLZV9",
OpenKMS:     true,
TimeoutMs:   5000,
LogLevel:    "debug",
}

// a more graceful way to create config client
client, err := clients.NewConfigClient(
vo.NacosClientParam{
ClientConfig: &cc,
},
)

Service Discovery

• Register instance：RegisterInstance

success, err := namingClient.RegisterInstance(vo.RegisterInstanceParam{
Ip:          "10.0.0.11",
Port:        8848,
ServiceName: "demo.go",
Weight:      10,
Enable:      true,
Healthy:     true,
Ephemeral:   true,
Metadata:    map[string]string{"idc":"shanghai"},
ClusterName: "cluster-a", // default value is DEFAULT
GroupName:   "group-a", // default value is DEFAULT_GROUP
})

• Deregister instance：DeregisterInstance

success, err := namingClient.DeregisterInstance(vo.DeregisterInstanceParam{
Ip:          "10.0.0.11",
Port:        8848,
ServiceName: "demo.go",
Ephemeral:   true,
Cluster:     "cluster-a", // default value is DEFAULT
GroupName:   "group-a", // default value is DEFAULT_GROUP
})

• Get service：GetService

services, err := namingClient.GetService(vo.GetServiceParam{
ServiceName: "demo.go",
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
GroupName:   "group-a", // default value is DEFAULT_GROUP
})

• Get all instances：SelectAllInstances

// SelectAllInstance return all instances,include healthy=false,enable=false,weight<=0
instances, err := namingClient.SelectAllInstances(vo.SelectAllInstancesParam{
ServiceName: "demo.go",
GroupName:   "group-a", // default value is DEFAULT_GROUP
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
})

• Get instances ：SelectInstances

// SelectInstances only return the instances of healthy=${HealthyOnly},enable=true and weight>0
instances, err := namingClient.SelectInstances(vo.SelectInstancesParam{
ServiceName: "demo.go",
GroupName:   "group-a", // default value is DEFAULT_GROUP
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
HealthyOnly: true,
})

• Get one healthy instance（WRR）：SelectOneHealthyInstance

// SelectOneHealthyInstance return one instance by WRR strategy for load balance
// And the instance should be health=true,enable=true and weight>0
instance, err := namingClient.SelectOneHealthyInstance(vo.SelectOneHealthInstanceParam{
ServiceName: "demo.go",
GroupName:   "group-a", // default value is DEFAULT_GROUP
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
})

• Listen service change event：Subscribe

// Subscribe key = serviceName+groupName+cluster
// Note: We call add multiple SubscribeCallback with the same key.
err := namingClient.Subscribe(vo.SubscribeParam{
ServiceName: "demo.go",
GroupName:   "group-a", // default value is DEFAULT_GROUP
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
SubscribeCallback: func (services []model.Instance, err error) {
log.Printf("\n\n callback return services:%s \n\n", utils.ToJsonString(services))
},
})

• Cancel listen of service change event：Unsubscribe

err := namingClient.Unsubscribe(vo.SubscribeParam{
ServiceName: "demo.go",
GroupName:   "group-a", // default value is DEFAULT_GROUP
Clusters:    []string{"cluster-a"}, // default value is DEFAULT
SubscribeCallback: func (services []model.Instance, err error) {
log.Printf("\n\n callback return services:%s \n\n", utils.ToJsonString(services))
},
})

• Get all services name:GetAllServicesInfo

serviceInfos, err := namingClient.GetAllServicesInfo(vo.GetAllServiceInfoParam{
NameSpace: "0e83cc81-9d8c-4bb8-a28a-ff703187543f",
PageNo:   1,
PageSize: 10,
}),

Dynamic configuration

• publish config：PublishConfig

success, err := configClient.PublishConfig(vo.ConfigParam{
DataId:  "dataId",
Group:   "group",
Content: "hello world!222222"})

• delete config：DeleteConfig

success, err = configClient.DeleteConfig(vo.ConfigParam{
DataId: "dataId",
Group:  "group"})

• get config info：GetConfig

content, err := configClient.GetConfig(vo.ConfigParam{
DataId: "dataId",
Group:  "group"})

• Listen config change event：ListenConfig

err := configClient.ListenConfig(vo.ConfigParam{
DataId: "dataId",
Group:  "group",
OnChange: func (namespace, group, dataId, data string) {
fmt.Println("group:" + group + ", dataId:" + dataId + ", data:" + data)
},
})

• Cancel the listening of config change event：CancelListenConfig

err := configClient.CancelListenConfig(vo.ConfigParam{
DataId: "dataId",
Group:  "group",
})

• Search config: SearchConfig

configPage, err := configClient.SearchConfig(vo.SearchConfigParam{
Search:   "blur",
DataId:   "",
Group:    "",
PageNo:   1,
PageSize: 10,
})

Example

We can run example to learn how to use nacos go client.

• Config Example
• Naming Example

Documentation

You can view the open-api documentation from the Nacos open-api wepsite.

You can view the full documentation from the Nacos website.

Contributing

Contributors are welcomed to join Nacos-sdk-go project. Please check CONTRIBUTING.md about how to contribute to this project.

Contact

• Join us from DingDing Group(23191211).
• Gitter: Nacos's IM tool for community messaging, collaboration and discovery.
• Twitter: Follow along for latest nacos news on Twitter.
• Weibo: Follow along for latest nacos news on Weibo (Twitter of China version).
• Nacos SegmentFault: Get the latest notice and prompt help from SegmentFault.
• Email Group:
  • users-nacos@googlegroups.com: Nacos usage general discussion.
  • dev-nacos@googlegroups.com: Nacos developer discussion (APIs, feature design, etc).
  • commits-nacos@googlegroups.com: Commits notice, very high frequency.