ircd::db: Add database's unique id string interface.

include/ircd/db/database/database.h

@@ -17,6 +17,7 @@ namespace ircd::db
 
 	// General information
 	const std::string &name(const database &);
+	const std::string &uuid(const database &);
 	uint64_t sequence(const database &); // Latest sequence number
 	std::vector<std::string> files(const database &, uint64_t &msz);
 	std::vector<std::string> files(const database &);
@@ -104,6 +105,7 @@ struct ircd::db::database
 	std::unordered_map<string_view, size_t> column_index;
 	std::vector<std::shared_ptr<column>> columns;
 	std::unique_ptr<rocksdb::DB> d;
+	std::string uuid;
 	std::unique_ptr<rocksdb::Checkpoint> checkpoint;
 	unique_const_iterator<decltype(dbs)> dbs_it;
 

ircd/db.cc

@@ -360,6 +360,18 @@ ircd::db::shared_from(const database::column &column)
 	return column.shared_from_this();
 }
 
+const std::string &
+ircd::db::uuid(const database &d)
+{
+	return d.uuid;
+}
+
+const std::string &
+ircd::db::name(const database &d)
+{
+	return d.name;
+}
+
 //
 // database
 //
@@ -624,6 +636,16 @@ try
 
 	return ret;
 }()}
+,uuid{[this]
+{
+	std::string ret;
+	throw_on_error
+	{
+		d->GetDbIdentity(ret)
+	};
+
+	return ret;
+}()}
 ,checkpoint{[this]
 {
 	rocksdb::Checkpoint *checkpointer{nullptr};
@@ -1112,12 +1134,6 @@ const
 	return handle.get();
 }
 
-const std::string &
-ircd::db::name(const database &d)
-{
-	return d.name;
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 //
 // database::snapshot

modules/console.cc

@@ -1715,6 +1715,10 @@ try
 		*db::database::dbs.at(param.at(0))
 	};
 
+	out << std::left << std::setw(28) << std::setfill('_') << "UUID "
+	    << " " << uuid(database)
+	    << std::endl;
+
 	out << std::left << std::setw(28) << std::setfill('_') << "columns "
 	    << " " << database.columns.size()
 	    << std::endl;