Clean API and add docs

src/Connection.zig

@@ -20,17 +20,16 @@ connection: SaprusMessage,
 
 const Connection = @This();
 
-pub fn init(socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage) Connection {
-    return .{
-        .socket = socket,
-        .headers = headers,
-        .connection = connection,
-    };
-}
-
 // 'p' as base64
 const pong = "cA==";
 
+/// Attempts to read from the network, and returns the next message, if any.
+///
+/// Asserts that `buf` is large enough to store the message that is received.
+///
+/// This will internally process management messages, and return the message
+/// payload for the next non management connection message.
+/// This function is ignorant to the message encoding.
 pub fn next(self: *Connection, io: Io, buf: []u8) ![]const u8 {
     while (true) {
         log.debug("Awaiting connection message", .{});
@@ -65,6 +64,10 @@ pub fn next(self: *Connection, io: Io, buf: []u8) ![]const u8 {
     }
 }
 
+/// Attempts to write a message to the network.
+///
+/// Clients should pass `.{}` for options unless you know what you are doing.
+/// `buf` will be sent over the network as-is; this function is ignorant of encoding.
 pub fn send(self: *Connection, io: Io, options: SaprusMessage.Connection.Options, buf: []const u8) !void {
     const io_source: std.Random.IoSource = .{ .io = io };
     const rand = io_source.interface();