code: function ServerUnaryCall(call, metadata) {
    EventEmitter.call(this);
    this.call = call;
    /**
     * Indicates if the call has been cancelled
     * @member {boolean} grpc~ServerUnaryCall#cancelled
     */
    this.cancelled = false;
    /**
     * The request metadata from the client
     * @member {grpc.Metadata} grpc~ServerUnaryCall#metadata
     */
    this.metadata = metadata;
    /**
     * The request message from the client
     * @member {*} grpc~ServerUnaryCall#request
     */
    this.request = undefined;
  }
docs: An EventEmitter. Used for unary calls.
  @constructor grpc~ServerUnaryCall
  @extends external:EventEmitter
  @param {grpc.internal~Call} call The call object associated with the request
  @param {grpc.Metadata} metadata The request metadata from the client