Add interfaces for Address Book, PeerStore Metadata, and Peerstore

peer/peermetadata_interface.py

@@ -0,0 +1,25 @@
+from abc import ABC, abstractmethod
+
+class IPeerMetadata(ABC):
+
+	def __init__(self, context):
+        self.context = context
+
+	@abstractmethod
+	def get(self, peerID, key):
+		"""
+		:param peerID: peer ID to lookup key for
+		:param key: key to look up
+        :return: value at key for given peer, error
+        """
+		pass
+
+	@abstractmethod
+	def put(self, peerID, key, val):
+		"""
+		:param peerID: peer ID to lookup key for
+		:param key: key to associate with peer
+		:param val: value to associated with key
+        :return: error
+        """
+		pass