Drop gRPC support

Dockerfile

@@ -2,7 +2,6 @@ FROM node:10.7.0-alpine
 WORKDIR /usr/app
 COPY . .
 ENV HOST 0.0.0.0
-ENV GRPC_PORT 10382
 ENV HTTP_PORT 8080
 RUN npm install --production
 EXPOSE 10382 8080

README.md

@@ -2,15 +2,15 @@
 
 ## Purpose
 The *node function invoker* provides a Docker base layer for a function consisting of a single NodeJS module.
-It accepts gRPC requests, invokes the command for each request in the input stream, and sends the command's output to the stream of gRPC responses.
+It accepts HTTP requests, invokes the function for each request in the input stream, and sends the function's output to the HTTP response.
 
 ## Development
 
 ### Prerequisites
 
 The following tools are required to build this project:
 
-- `node` 8 (only for tests)
+- `node` 10 (only for tests)
 - [jq](https://stedolan.github.io/jq/download/)
 - Docker
 

lib/interaction-models/node-streams.js

@@ -35,7 +35,7 @@ function nodeStreamsInteractionModel(fn, argumentTransformer, messageStream) {
             const errorMessage = buildErrorMessage(e, {
                 correlationId: headers.getValue('correlationId')
             });
-            // write errors directly to grpcStream
+            // write errors directly to messageStream
             messageStream.write(errorMessage.toRiffMessage());
         }
         callback();

node-invoker.yaml

@@ -10,7 +10,7 @@ spec:
   - "*.js"
   functionTemplate:
     spec:
-      protocol: grpc
+      protocol: http
   files:
   - path: Dockerfile
     template: |