Refactor and fix ObjectStore.

1 files changed, 171 insertions, 12 deletions

diff --git a/backends/objectstore.py b/backends/objectstore.py
index 2ab07675..03694532 100644
--- a/backends/objectstore.py
+++ b/backends/objectstore.py
@@ -1,6 +1,5 @@
 from u1db.backends import CommonBackend
 from u1db import errors, Document, vectorclock
-from leap.soledad import util as soledadutil
 
 class ObjectStore(CommonBackend):
     """
@@ -12,9 +11,9 @@ class ObjectStore(CommonBackend):
         # with the database is established in each implementation, so it can
         # ensure that u1db data is configured and up-to-date.
         self.set_document_factory(Document)
-        self._sync_log = soledadutil.SyncLog()
-        self._transaction_log = soledadutil.TransactionLog()
-        self._conflict_log = soledadutil.ConflictLog(self._factory)
+        self._sync_log = SyncLog()
+        self._transaction_log = TransactionLog()
+        self._conflict_log = ConflictLog(self._factory)
         self._replica_uid = replica_uid
         self._ensure_u1db_data()
 
@@ -139,19 +138,18 @@ class ObjectStore(CommonBackend):
 
     def _set_replica_gen_and_trans_id(self, other_replica_uid,
                                       other_generation, other_transaction_id):
-        self._get_u1db_data()
+        return self._do_set_replica_gen_and_trans_id(
+                 other_replica_uid,
+                 other_generation,
+                 other_transaction_id)
+
+    def _do_set_replica_gen_and_trans_id(self, other_replica_uid,
+                                         other_generation, other_transaction_id):
         self._sync_log.set_replica_gen_and_trans_id(other_replica_uid,
                                                     other_generation,
                                                     other_transaction_id)
         self._set_u1db_data()
 
-    def _do_set_replica_gen_and_trans_id(self, other_replica_uid,
-                                         other_generation, other_transaction_id):
-        return self._set_replica_gen_and_trans_id(
-                 other_replica_uid,
-                 other_generation,
-                 other_transaction_id)
-
     def _get_transaction_log(self):
         self._get_u1db_data()
         return self._transaction_log.get_transaction_log()
@@ -276,3 +274,164 @@ class ObjectStore(CommonBackend):
         self._add_conflict(doc.doc_id, my_doc.rev, my_doc.get_json())
         doc.has_conflicts = True
         self._put_and_update_indexes(my_doc, doc)
+
+
+#----------------------------------------------------------------------------
+# U1DB's Transaction, Sync, and conflict Logs
+#----------------------------------------------------------------------------
+
+class SimpleList(object):
+    def __init__(self):
+        self._log = []
+
+    def _set_log(self, log):
+        self._log = log
+
+    def _get_log(self):
+        return self._log
+
+    log = property(
+        _get_log, _set_log, doc="Log contents.")
+
+    def append(self, msg):
+        self._log.append(msg)
+
+    def reduce(self, func, initializer=None):
+        return reduce(func, self._log, initializer)
+
+    def map(self, func):
+        return map(func, self._get_log())
+
+    def filter(self, func):
+        return filter(func, self._get_log())
+
+
+class TransactionLog(SimpleList):
+    """
+    An ordered list of (generation, doc_id, transaction_id) tuples.
+    """
+
+    def _set_log(self, log):
+        self._log = log
+
+    def _get_log(self):
+        return sorted(self._log, reverse=True)
+
+    log = property(
+        _get_log, _set_log, doc="Log contents.")
+
+    def get_generation(self):
+        """
+        Return the current generation.
+        """
+        gens = self.map(lambda x: x[0])
+        if not gens:
+            return 0
+        return max(gens)
+
+    def get_generation_info(self):
+        """
+        Return the current generation and transaction id.
+        """
+        if not self._log:
+            return(0, '')
+        info = self.map(lambda x: (x[0], x[2]))
+        return reduce(lambda x, y: x if (x[0] > y[0]) else y, info)
+
+    def get_trans_id_for_gen(self, gen):
+        """
+        Get the transaction id corresponding to a particular generation.
+        """
+        log = self.reduce(lambda x, y: y if y[0] == gen else x)
+        if log is None:
+            return None
+        return log[2]
+
+    def whats_changed(self, old_generation):
+        """
+        Return a list of documents that have changed since old_generation.
+        """
+        results = self.filter(lambda x: x[0] > old_generation)
+        seen = set()
+        changes = []
+        newest_trans_id = ''
+        for generation, doc_id, trans_id in results:
+            if doc_id not in seen:
+                changes.append((doc_id, generation, trans_id))
+                seen.add(doc_id)
+        if changes:
+            cur_gen = changes[0][1]  # max generation
+            newest_trans_id = changes[0][2]
+            changes.reverse()
+        else:
+            results = self._get_log()
+            if not results:
+                cur_gen = 0
+                newest_trans_id = ''
+            else:
+                cur_gen, _, newest_trans_id = results[0]
+
+        return cur_gen, newest_trans_id, changes
+
+
+    def get_transaction_log(self):
+        """
+        Return only a list of (doc_id, transaction_id)
+        """
+        return map(lambda x: (x[1], x[2]), sorted(self._log))
+
+
+class SyncLog(SimpleList):
+    """
+    A list of (replica_id, generation, transaction_id) tuples.
+    """
+
+    def find_by_replica_uid(self, replica_uid):
+        if not self._get_log():
+            return ()
+        return self.reduce(lambda x, y: y if y[0] == replica_uid else x)
+
+    def get_replica_gen_and_trans_id(self, other_replica_uid):
+        """
+        Return the last known generation and transaction id for the other db
+        replica.
+        """
+        info = self.find_by_replica_uid(other_replica_uid)
+        if not info:
+            return (0, '')
+        return (info[1], info[2])
+
+    def set_replica_gen_and_trans_id(self, other_replica_uid,
+                                      other_generation, other_transaction_id):
+        """
+        Set the last-known generation and transaction id for the other
+        database replica.
+        """
+        self._log = self.filter(lambda x: x[0] != other_replica_uid)
+        self.append((other_replica_uid, other_generation,
+                     other_transaction_id))
+
+class ConflictLog(SimpleList):
+    """
+    A list of (doc_id, my_doc_rev, my_content) tuples.
+    """
+
+    def __init__(self, factory):
+        super(ConflictLog, self).__init__()
+        self._factory = factory
+    
+    def delete_conflicts(self, conflicts):
+        for conflict in conflicts:
+            self._log = self.filter(lambda x:
+                         x[0] != conflict[0] or x[1] != conflict[1])
+
+    def get_conflicts(self, doc_id):
+        conflicts = self.filter(lambda x: x[0] == doc_id)
+        if not conflicts:
+            return []
+        return reversed(map(lambda x: self._factory(doc_id, x[1], x[2]),
+                            conflicts))
+
+    def has_conflicts(self, doc_id):
+        return bool(self.filter(lambda x: x[0] == doc_id))
+