Implemented protobuf infastructure and definitions for proposal and npl messages.

README.md

@@ -35,6 +35,20 @@ Following Instructions are based on Boost [getting started](https://www.boost.or
 2. Navigate to the extracted directory.
 3. Run `sudo cp -r include/rapidjson /usr/local/include/`
 
+#### Install Protocol buffers
+Instructions are based on [this](https://github.com/protocolbuffers/protobuf/tree/master/src).
+
+1. Download and extract Protobuf 3.10.0 from [here](https://github.com/protocolbuffers/protobuf/releases/tag/v3.10.0).
+2. Navigate to the extracted Protobuf directory in a terminal.
+3. Run `./configure`
+4. Run `make && make check`
+5. Run `sudo make install`
+
+#### Compile Protocol buffers
+1. Run `protoc -I=./src/p2p --cpp_out=./src/p2p ./src/p2p/message.proto`
+    Ex - For message protobuf 
+            `protoc -I=./src/p2p --cpp_out=./src/p2p ./src/p2p/message.proto`
+            
 #### Run ldconfig
 1. Run `sudo ldconfig`
 

makefile

@@ -1,4 +1,4 @@
 all:
 	mkdir -p build
-	g++ src/*.cpp -lsodium -lboost_system -lboost_filesystem -std=c++17 -o build/hpcore
+	g++ src/*.cpp src/*.cc -lsodium -lboost_system -lboost_filesystem -pthread -lprotobuf  -std=c++17 -o build/hpcore 
 	echo 'build successful, binary in '`pwd`'/build/hpcore'

src/p2p/message.proto

@@ -0,0 +1,69 @@
+syntax = "proto2";
+
+package p2p;
+
+message Message {
+  optional string version = 1;
+  optional bytes publicKey = 2;
+  optional int32 timestamp = 3;
+  optional bytes signature = 4;
+
+  enum Messagetype {
+    PROPOSAL = 0;
+    NPL = 1;
+    STATE_REQUEST = 2;
+    STATE_RESPONSE = 3;
+    HISTORY_REQUEST = 4;
+    HISTORY_RESPONSE = 5;
+  }
+
+  optional Messagetype type = 5;
+  optional bytes content = 6;
+}
+
+message StateDifference {
+map<string, string> created = 1; 
+map<string, string> updated = 2; 
+map<string, string> deleted = 3; 
+}
+
+message State {
+optional bytes previous = 1;
+optional bytes current = 2;
+optional StateDifference difference = 3;
+map<string, string> patch = 4;
+}
+
+
+message Proposal {
+  repeated string connections = 1;
+  repeated string inputs = 2;
+  repeated string outputs = 3;
+  optional int32 stage = 4;
+  optional int32 time = 5;
+  optional State state = 6;
+  optional bytes lcl = 7;
+}
+
+message NPL {
+  optional bytes data = 1;
+  optional bytes lcl = 2;
+}
+
+message StateRequest {
+
+}
+
+message StateResponse {
+ 
+}
+
+message HistoryRequest {
+
+}
+
+message HistoryResponse {
+  
+}
+
+