merge files from the blockchain infra repo (#59)

code/protocol_demos/grpc-demo/.gitignore

@@ -0,0 +1 @@
+/node_modules

code/protocol_demos/grpc-demo/client.js

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+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!"))

code/protocol_demos/grpc-demo/package.json

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+{
+  "name": "grpc-demo",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@grpc/proto-loader": "^0.5.3",
+    "grpc": "^1.24.9"
+  }
+}

code/protocol_demos/grpc-demo/server.js

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+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 server = new grpc.Server();
+server.bind("0.0.0.0:40000",
+ grpc.ServerCredentials.createInsecure());
+
+server.addService(todoPackage.Todo.service,
+    {
+        "createTodo": createTodo,
+        "readTodos" : readTodos,
+        "readTodosStream": readTodosStream
+    });
+server.start();
+
+const todos = []
+function createTodo (call, callback) {
+    const todoItem = {
+        "id": todos.length + 1,
+        "text": call.request.text
+    }
+    todos.push(todoItem)
+    callback(null, todoItem);
+}
+
+function readTodosStream(call, callback) {
+    
+    todos.forEach(t => call.write(t));
+    call.end();
+}
+
+
+function readTodos(call, callback) {
+    callback(null, {"items": todos})   
+}

code/protocol_demos/grpc-demo/todo.proto

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+syntax = "proto3";
+
+package todoPackage;
+
+service Todo {
+    rpc createTodo(TodoItem) returns (TodoItem);
+    rpc readTodos(voidNoParam) returns (TodoItems);
+    rpc readTodosStream(voidNoParam) returns (stream TodoItem);
+
+}
+
+message voidNoParam {}
+
+message TodoItem {
+    int32 id = 1;
+    string text = 2;
+}
+
+message TodoItems {
+    repeated TodoItem items = 1;
+}