Websocket re-architecture with websocketd and websocat (#89)

- Replaced beast with websocketd and websocat. #79 #83 #84
- Implemented inbound/outbound peer connection merging.
- Added graceful shutdown of hpcore with sigint. #87

src/fbschema/p2pmsg_helpers.cpp

@@ -1,4 +1,3 @@
-#include <flatbuffers/flatbuffers.h>
 #include "../pchheader.hpp"
 #include "../conf.hpp"
 #include "../crypto.hpp"
@@ -28,7 +27,7 @@ namespace fbschema::p2pmsg
  * received data and then interprit the 'Content' portion of it separately to read the actual content.
  */
 
-//---Message validation and reading helpers---/
+//---Message validation helpers---/
 
 /**
  * Verifies Conatiner message structure and outputs faltbuffer Container pointer to access the given buffer.
@@ -139,6 +138,13 @@ int validate_and_extract_content(const Content **content_ref, const uint8_t *con
     return 0;
 }
 
+//---Message reading helpers---/
+
+std::string_view get_peerid_from_msg(const PeerId_Notify_Message &msg)
+{
+    return flatbuff_bytes_to_sv(msg.peerid());
+}
+
 /**
  * Creates a non-unl proposal stuct from the given non-unl proposal message.
  * @param The Flatbuffer non-unl poporal received from the peer.
@@ -252,6 +258,23 @@ const p2p::block_response create_block_response_from_msg(const Block_Response &m
 
 //---Message creation helpers---//
 
+void create_msg_from_peerid(flatbuffers::FlatBufferBuilder &container_builder, std::string_view peerid)
+{
+    flatbuffers::FlatBufferBuilder builder(1024);
+
+    const flatbuffers::Offset<PeerId_Notify_Message> peerid_msg =
+        CreatePeerId_Notify_Message(
+            builder,
+            sv_to_flatbuff_bytes(builder, peerid));
+
+    const flatbuffers::Offset<Content> message = CreateContent(builder, Message_PeerId_Notify_Message, peerid_msg.Union());
+    builder.Finish(message); // Finished building message content to get serialised content.
+
+    // Now that we have built the content message,
+    // we need to sign it and place it inside a container message.
+    create_containermsg_from_content(container_builder, builder, nullptr, false);
+}
+
 void create_msg_from_nonunl_proposal(flatbuffers::FlatBufferBuilder &container_builder, const p2p::nonunl_proposal &nup)
 {
     flatbuffers::FlatBufferBuilder builder(1024);