CommandableHttpClient

Commandable services are generated automatically for ICommandable

Implements: 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.

CommandableHttpClient(base_route: str)

  • base_route: str - base route for a remote service.

Instance methods

call_command

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.

call_command(name: str, context: Optional[IContext], params: Any): Any

  • name: str - name of the command to call.
  • context: IContext - (optional) a context to trace execution through a call chain.
  • params: Any - command parameters.
  • returns: Any - result of the command.

Examples

class MyCommandableHttpClient(CommandableHttpClient, IMyClient):
    # ...

    def get_data(self, context, id):
        return self.call_command("get_data", context, MyData(id))

        # ...

    client = MyCommandableHttpClient()
    client.configure(ConfigParams.from_tuples("connection.protocol", "http",
                                                 "connection.host", "localhost",
                                                 "connection.port", 8080))
                                                 
    client.open("123")
    
    data = client.getData("123", "1")
     # ...