ircd:Ⓜ️:fed: Add convenience delegator for send.

include/ircd/m/fed/send.h

@@ -38,6 +38,12 @@ struct ircd::m::fed::send
 	     const mutable_buffer &head,      // buffer for HTTP head in and out
 	     opts);                           // options structure
 
+	explicit
+	send(const txn::array &pdu,
+	     const txn::array &edu,
+	     const mutable_buffer &buf,
+	     opts);
+
 	send() = default;
 };
 

include/ircd/m/m.h

@@ -65,6 +65,7 @@ namespace ircd
 #include "device.h"
 #include "push.h"
 #include "createroom.h"
+#include "txn.h"
 #include "room/room.h"
 #include "user/user.h"
 #include "users.h"
@@ -84,7 +85,6 @@ namespace ircd
 #include "receipt.h"
 #include "direct_to_device.h"
 #include "relates.h"
-#include "txn.h"
 #include "visible.h"
 #include "redacted.h"
 #include "feds.h"

matrix/fed.cc

@@ -66,6 +66,35 @@ const
 		closure(event_id, error);
 }
 
+ircd::m::fed::send::send(const txn::array &pdu,
+                         const txn::array &edu,
+                         const mutable_buffer &buf_,
+                         opts opts)
+:send{[&]
+{
+	assert(!!opts.remote);
+
+	mutable_buffer buf{buf_};
+	const string_view &content
+	{
+		txn::create(buf, pdu, edu)
+	};
+
+	consume(buf, size(content));
+	const string_view &txnid
+	{
+		txn::create_id(buf, content)
+	};
+
+	consume(buf, size(txnid));
+	return send
+	{
+		txnid, content, buf, std::move(opts)
+	};
+}()}
+{
+}
+
 ircd::m::fed::send::send(const string_view &txnid,
                          const const_buffer &content,
                          const mutable_buffer &buf_,