From e1bb2f702d42820d70c4091ce9fa2f5b95741c8c Mon Sep 17 00:00:00 2001
From: Chad Birch <chad.birch@gmail.com>
Date: Wed, 20 Nov 2013 13:16:19 -0800
Subject: [PATCH] Daily gold goal: store in cassandra

---
 r2/r2/models/gold.py | 68 +++++++++++++++++++++++++++++---------------
 1 file changed, 45 insertions(+), 23 deletions(-)

diff --git a/r2/r2/models/gold.py b/r2/r2/models/gold.py
index e056b11b4..9bf1c6bc7 100644
--- a/r2/r2/models/gold.py
+++ b/r2/r2/models/gold.py
@@ -24,9 +24,11 @@ from r2.lib.db.tdb_sql import make_metadata, index_str, create_table
 
 import pytz
 
+from pycassa import NotFoundException
+from pycassa.system_manager import INT_TYPE, UTF8_TYPE
 from pylons import g, c
 from pylons.i18n import _
-from datetime import datetime, timedelta
+from datetime import datetime
 import sqlalchemy as sa
 from sqlalchemy.exc import IntegrityError, OperationalError
 from sqlalchemy.ext.declarative import declarative_base
@@ -39,6 +41,7 @@ import re
 from random import choice
 from time import time
 
+from r2.lib.db import tdb_cassandra
 from r2.lib.db.tdb_cassandra import NotFound
 from r2.models import Account
 from r2.models.subreddit import Frontpage
@@ -84,6 +87,46 @@ indices = [index_str(gold_table, 'status', 'status'),
 create_table(gold_table, indices)
 
 
+class GoldRevenueGoalByDate(object):
+    __metaclass__ = tdb_cassandra.ThingMeta
+
+    _use_db = True
+    _cf_name = "GoldRevenueGoalByDate"
+    _read_consistency_level = tdb_cassandra.CL.ONE
+    _write_consistency_level = tdb_cassandra.CL.ALL
+    _extra_schema_creation_args = {
+        "column_name_class": UTF8_TYPE,
+        "default_validation_class": INT_TYPE,
+    }
+    _compare_with = UTF8_TYPE
+    _type_prefix = None
+
+    ROWKEY = '1'
+
+    @staticmethod
+    def _colkey(date):
+        return date.strftime("%Y-%m-%d")
+
+    @classmethod
+    def set(cls, date, goal):
+        cls._cf.insert(cls.ROWKEY, {cls._colkey(date): goal})
+
+    @classmethod
+    def get(cls, date):
+        """Gets the goal for a date, or the nearest previous goal."""
+        try:
+            colkey = cls._colkey(date)
+            col = cls._cf.get(
+                cls.ROWKEY,
+                column_reversed=True,
+                column_start=colkey,
+                column_count=1,
+            )
+            return col.values()[0]
+        except NotFoundException:
+            return None
+
+
 def create_unclaimed_gold (trans_id, payer_email, paying_id,
                            pennies, days, secret, date,
                            subscr_id = None):
@@ -287,28 +330,7 @@ def gold_revenue_on(date):
 @memoize("gold-goal")
 def gold_goal_on(date):
     """Returns the gold revenue goal (in pennies) for a given date."""
-    # handle the old static goal
-    if date <= gold_static_goal_cutoff.date():
-        return g.live_config["gold_revenue_goal"]
-
-    # fetch the revenues from the previous 7 days
-    previous_date = date - timedelta(days=1)
-    previous_revenues = []
-    while previous_date >= date - timedelta(days=7):
-        previous_revenues.append(gold_revenue_on(previous_date))
-        previous_date -= timedelta(days=1)
-
-    # throw out highest and lowest values and set goal to 110% of average
-    previous_revenues = sorted(previous_revenues)[1:-1]
-    average_revenue = sum(previous_revenues) / float(len(previous_revenues))
-    goal = average_revenue * 1.1
-
-    # don't let this be more than 20% different from the previous goal
-    previous_goal = gold_goal_on(date - timedelta(days=1))
-    goal = min(previous_goal * 1.2, goal)
-    goal = max(previous_goal * 0.8, goal)
-
-    return round(goal, 0)
+    return GoldRevenueGoalByDate.get(date)
 
 
 def account_from_stripe_customer_id(stripe_customer_id):