First sketch of HTTP client.

src/allmydata/storage/http_client.py

@@ -0,0 +1,36 @@
+"""
+HTTP client that talks to the HTTP storage server.
+"""
+
+# Make sure to import Python version:
+from cbor2.encoder import loads
+from cbor2.decoder import loads
+
+from twisted.internet.defer import inlineCallbacks, returnValue
+from hyperlink import DecodedURL
+import treq
+
+
+def _decode_cbor(response):
+    """Given HTTP response, return decoded CBOR body."""
+    return treq.content(response).addCallback(loads)
+
+
+class StorageClient(object):
+    """
+    HTTP client that talks to the HTTP storage server.
+    """
+
+    def __init__(self, url: DecodedURL, swissnum, treq=treq):
+        self._base_url = url
+        self._swissnum = swissnum
+        self._treq = treq
+
+    @inlineCallbacks
+    def get_version(self):
+        """
+        Return the version metadata for the server.
+        """
+        url = self._base_url.child("v1", "version")
+        response = _decode_cbor((yield self._treq.get(url)))
+        returnValue(response)