From 39312ec4afe4b6d28f8e87a1f713a1c6b770030b Mon Sep 17 00:00:00 2001
From: drebs <drebs@leap.se>
Date: Mon, 3 Dec 2012 11:06:23 -0200
Subject: LeapSyncTarget encodes/decodes before/after syncing

---
 __init__.py | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 85 insertions(+), 2 deletions(-)

(limited to '__init__.py')

diff --git a/__init__.py b/__init__.py
index 94286370..5174d818 100644
--- a/__init__.py
+++ b/__init__.py
@@ -14,6 +14,7 @@ from u1db import (
     query_parser,
     vectorclock,
     )
+from u1db.remote.http_target import HTTPSyncTarget
 
 from swiftclient import client
 import base64
@@ -148,14 +149,20 @@ class OpenStackDatabase(CommonBackend):
 
 class LeapDocument(Document):
 
-    def get_content_encrypted(self):
+    def __init__(self, doc_id=None, rev=None, json='{}', has_conflicts=False,
+                 encrypted_json=None):
+        super(Document, self).__init__(doc_id, rev, json, has_conflicts)
+        if encrypted_json:
+            self.set_encrypted_json(encrypted_json)
+
+    def get_encrypted_json(self):
         """
         Returns document's json serialization encrypted with user's public key.
         """
         # TODO: replace for openpgp encryption with users's pub key.
         return base64.b64encode(self.get_json())
 
-    def set_content_encrypted(self):
+    def set_encrypted_json(self):
         """
         Set document's content based on encrypted version of json string.
         """
@@ -165,6 +172,82 @@ class LeapDocument(Document):
         return self.set_json(base64.b64decode(self.get_json()))
 
 
+class LeapSyncTarget(HTTPSyncTarget):
+
+    def _parse_sync_stream(self, data, return_doc_cb, ensure_callback=None):
+        parts = data.splitlines()  # one at a time
+        if not parts or parts[0] != '[':
+            raise BrokenSyncStream
+        data = parts[1:-1]
+        comma = False
+        if data:
+            line, comma = utils.check_and_strip_comma(data[0])
+            res = json.loads(line)
+            if ensure_callback and 'replica_uid' in res:
+                ensure_callback(res['replica_uid'])
+            for entry in data[1:]:
+                if not comma:  # missing in between comma
+                    raise BrokenSyncStream
+                line, comma = utils.check_and_strip_comma(entry)
+                entry = json.loads(line)
+                doc = LeapDocument(entry['id'], entry['rev'],
+                                   encrypted_json=entry['content'])
+                return_doc_cb(doc, entry['gen'], entry['trans_id'])
+        if parts[-1] != ']':
+            try:
+                partdic = json.loads(parts[-1])
+            except ValueError:
+                pass
+            else:
+                if isinstance(partdic, dict):
+                    self._error(partdic)
+            raise BrokenSyncStream
+        if not data or comma:  # no entries or bad extra comma
+            raise BrokenSyncStream
+        return res
+
+    def sync_exchange(self, docs_by_generations, source_replica_uid,
+                      last_known_generation, last_known_trans_id,
+                      return_doc_cb, ensure_callback=None):
+        self._ensure_connection()
+        if self._trace_hook:  # for tests
+            self._trace_hook('sync_exchange')
+        url = '%s/sync-from/%s' % (self._url.path, source_replica_uid)
+        self._conn.putrequest('POST', url)
+        self._conn.putheader('content-type', 'application/x-u1db-sync-stream')
+        for header_name, header_value in self._sign_request('POST', url, {}):
+            self._conn.putheader(header_name, header_value)
+        entries = ['[']
+        size = 1
+
+        def prepare(**dic):
+            entry = comma + '\r\n' + json.dumps(dic)
+            entries.append(entry)
+            return len(entry)
+
+        comma = ''
+        size += prepare(
+            last_known_generation=last_known_generation,
+            last_known_trans_id=last_known_trans_id,
+            ensure=ensure_callback is not None)
+        comma = ','
+        for doc, gen, trans_id in docs_by_generations:
+            size += prepare(id=doc.doc_id, rev=doc.rev,
+                            content=doc.get_encrypted_json(),
+                            gen=gen, trans_id=trans_id)
+        entries.append('\r\n]')
+        size += len(entries[-1])
+        self._conn.putheader('content-length', str(size))
+        self._conn.endheaders()
+        for entry in entries:
+            self._conn.send(entry)
+        entries = None
+        data, _ = self._response()
+        res = self._parse_sync_stream(data, return_doc_cb, ensure_callback)
+        data = None
+        return res['new_generation'], res['new_transaction_id']
+
+
 class OpenStackSyncTarget(CommonSyncTarget):
 
     def get_sync_info(self, source_replica_uid):
-- 
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