Merge pull request #11 from zixuanzh/multiaddr

Basic multiaddr representation.

network/multiaddr.py

@@ -0,0 +1,39 @@
+class Multiaddr:
+
+    def __init__(self, addr):
+        if not addr[0] == "/":
+            raise MultiaddrValueError("Invalid input multiaddr.")
+
+        addr = addr[1:]
+        protocol_map = dict()
+        split_addr = addr.split("/")
+
+        if not split_addr or len(split_addr) % 2 != 0:
+            raise MultiaddrValueError("Invalid input multiaddr.")
+
+        is_protocol = True
+        curr_protocol = ""
+
+        for addr_part in split_addr:
+            if is_protocol:
+                curr_protocol = addr_part
+            else:
+                protocol_map[curr_protocol] = addr_part
+            is_protocol = not is_protocol
+
+        self.protocol_map = protocol_map
+        self.addr = addr
+
+    def get_protocols(self):
+        return list(self.protocol_map.keys())
+
+    def get_protocol_value(self, protocol):
+        if protocol not in self.protocol_map:
+            return None
+
+        return self.protocol_map[protocol]
+
+
+class MultiaddrValueError(ValueError):
+    """Raised when the input string to the Multiaddr constructor was invalid."""
+    pass