kvs.git

@@ -2,6 +2,15 @@

 kvs is a rudimentary key/value store written in Python.

+## Dependencies and Guarantees

+

+kvs was written as an experiment. The master branch uses a local file for its backing store. Its ACID properties are as follows:

+

+* **Atomicity**: Either all tuples in a transaction are successfully saved or none are.

+* **Consistency**: Only valid states are saved, and saves are atomic. 

+* **Isolation**: All transactions are serialized.

+* **Durability**: System failure or restart won't break the store. Store writes are atomic.

+

 # Getting the project

 You can get a copy of this project by clicking on the

@@ -142,9 +142,13 @@ if __name__ == '__main__':

         with open('auth.txt', 'r') as f:

             authorization = f.read().strip()

         if doing_post and auth == authorization:

+            print "Content-type: text/plain; charset=utf-8\n"

             for new_key in args:

-                if new_key not in ('auth', ) and \

-                    len(new_key) < 80 and len(args[new_key].value) < 140:

+                if new_key  =='auth':

+                    continue

+                if  len(new_key) > 80 or len(args[new_key].value) > 140:

+                    print "Error: A key or value was too long."

+                    sys.exit(0)

                 if new_key in store and 'created' in store[new_key]:

                     created_time = store[new_key]['created']

                 else:

@@ -155,9 +159,7 @@ if __name__ == '__main__':

                                   'origin': os.environ['REMOTE_ADDR']}

             write_file(os.path.join(localdir, store_name), store)

             wrote_response = True

-                    print "Content-type: text/plain; charset=utf-8\n"

             print "OK"

-                    break

         elif not os.environ['QUERY_STRING'] and not doing_post:

             # just the home page, then

             print "Content-type: text/plain; charset=UTF-8\n"