merge files from the blockchain infra repo (#59)

code/protocol_demos/grpc-demo/client.js

@@ -0,0 +1,35 @@
+const grpc = require("grpc");
+const protoLoader = require("@grpc/proto-loader")
+const packageDef = protoLoader.loadSync("todo.proto", {});
+const grpcObject = grpc.loadPackageDefinition(packageDef);
+const todoPackage = grpcObject.todoPackage;
+
+const text = process.argv[2];
+
+const client = new todoPackage.Todo("localhost:40000", 
+grpc.credentials.createInsecure())
+console.log(text)
+
+client.createTodo({
+    "id": -1,
+    "text": text
+}, (err, response) => {
+
+    console.log("Recieved from server " + JSON.stringify(response))
+
+})
+/*
+client.readTodos(null, (err, response) => {
+
+    console.log("read the todos from server " + JSON.stringify(response))
+    if (!response.items)
+        response.items.forEach(a=>console.log(a.text));
+})
+*/
+
+const call = client.readTodosStream();
+call.on("data", item => {
+    console.log("received item from server " + JSON.stringify(item))
+})
+
+call.on("end", e => console.log("server done!"))