CommandableHttpClient

Extends: RestClient

Description

The CommandableHttpClient class allows you to create commandable services. Commandable services are generated automatically for ICommandable objects.

Important points

• Each command is exposed as a POST operation that receives all parameters in the body object.

Configuration parameters

• base_route: base route for a remote URI
• connection(s):
  • discovery_key: (optional) key to retrieve the connection from IDiscovery
  • protocol: connection protocol (http or https)
  • host: host name or IP address
  • port: port number
  • uri: resource URI or connection string with all parameters in it
• options:
  • retries: number of retries (default: 3)
  • connect_timeout: connection timeout in milliseconds (default: 10 sec)
  • timeout: invocation timeout in milliseconds (default: 10 sec)

References

• *:logger:*:*:1.0 - (optional) ILogger components to pass log messages
• *:counters:*:*:1.0 - (optional) ICounters components to pass collected measurements
• *:traces:*:*:1.0 - (optional) ITracer components to record traces
• *:discovery:*:*:1.0 - (optional) IDiscovery services to resolve a connection

Constructors

Creates a new instance of the client.

public constructor(baseRoute: string)

• baseRoute: string - base route for a remote service.

Instance methods

callCommand

Calls a remote method via the HTTP commadable protocol. The call is made via a POST operation and all parameters are sent in the body object. The complete route to the remote method is defined as baseRoute + “/” + name.

(c *CommandableHttpClient) CallCommand(ctx context.Context, name string, params *cdata.AnyValueMap) (*http.Response, error)

• name: string - name of the command to call.
• context: IContext - (optional) a context to trace execution through call chain.
• params: any - command parameters.
• returns: (c *CommandableHttpClient) - result of the command.

Examples

		type MyCommandableHttpClient struct{
			*CommandableHttpClient
			...
		}
		func (c * MyCommandableHttpClient) GetData(ctx context.Context, id string)(result MyData, err error){
			params:= cdata.NewEmptyStringValueMap()
			params.Set("id",id)
			res, err := c.CallCommand(
				prototype
				"get_data",
				params,
			)
			...
			// convert response to MyData
			...
			return result, err
		}


		client = NewMyCommandableHttpClient();
		client.Configure(context.Background(), cconf.NewConfigParamsFromTuples(
			"connection.protocol", "http",
			"connection.host", "localhost",
			"connection.port", 8080
		));

		result, err := client.GetData(context.Background(), "123", "1")
...