firecomm/examples/vanilla_gRPC/interceptorProvider.js

A complete framework for gRPC-node.js

const grpc = require("grpc");

module.exports = function(options, nextCall) {
  var requester = {
    start: function(metadata, listener, next) {
      console.log("metadata start", metadata);
      var newListener = {
        onReceiveMetadata: function(metadata, next) {
          console.log("metadata on Receive meta", metadata);
          next(metadata);
        },
        onReceiveMessage: function(message, next) {
          console.log("metadata on Receive message", metadata);
          next(message);
        },
        onReceiveStatus: function(status, next) {
          console.log("metadata on receive status", metadata);
          next(status);
        }
      };
      next(metadata, newListener);
    },
    sendMessage: function(message, next) {
      // console.log("sendmessage", message);
      next(message);
    },
    halfClose: function(next) {
      // console.log("halfclose");
      next();
    },
    cancel: function(message, next) {
      // console.log("cancel", message);
      next();
    }
  };
  return new grpc.InterceptingCall(nextCall(options), requester);
};