Revert "Revert "configurable trending algorithms""

This reverts commit 55e08f96a6.

lbry/wallet/server/db/trending/__init__.py

@@ -0,0 +1,6 @@
+from . import zscore
+
+
+TRENDING_ALGORITHMS = {
+    'zscore': zscore,
+}

lbry/wallet/server/db/trending/zscore.py

@@ -52,11 +52,12 @@ class ZScore:
         return cls(), cls.step, cls.finalize
 
 
-def register_trending_functions(connection):
+def install(connection):
     connection.createaggregatefunction("zscore", ZScore.factory, 1)
+    connection.cursor().execute(CREATE_TREND_TABLE)
 
 
-def calculate_trending(db, height, final_height):
+def run(db, height, final_height, affected_claims):
     # don't start tracking until we're at the end of initial sync
     if height < (final_height - (TRENDING_WINDOW * TRENDING_DATA_POINTS)):
         return

lbry/wallet/server/db/writer.py

@@ -17,9 +17,7 @@ from lbry.wallet import Ledger, RegTestLedger
 from lbry.wallet.transaction import Transaction, Output
 from lbry.wallet.server.db.canonical import register_canonical_functions
 from lbry.wallet.server.db.full_text_search import update_full_text_search, CREATE_FULL_TEXT_SEARCH, first_sync_finished
-from lbry.wallet.server.db.trending import (
+from lbry.wallet.server.db.trending import TRENDING_ALGORITHMS
-    CREATE_TREND_TABLE, calculate_trending, register_trending_functions
-)
 
 from .common import CLAIM_TYPES, STREAM_TYPES, COMMON_TAGS
 
@@ -165,14 +163,14 @@ class SQLDB:
 
     CREATE_TABLES_QUERY = (
         CREATE_CLAIM_TABLE +
-        CREATE_TREND_TABLE +
         CREATE_FULL_TEXT_SEARCH +
         CREATE_SUPPORT_TABLE +
         CREATE_CLAIMTRIE_TABLE +
         CREATE_TAG_TABLE
     )
 
-    def __init__(self, main, path: str, blocking_channels: list, filtering_channels: list):
+    def __init__(
+            self, main, path: str, blocking_channels: list, filtering_channels: list, trending: list):
         self.main = main
         self._db_path = path
         self.db = None
@@ -190,6 +188,7 @@ class SQLDB:
         self.filtering_channel_hashes = {
             unhexlify(channel_id)[::-1] for channel_id in filtering_channels if channel_id
         }
+        self.trending = trending
 
     def open(self):
         self.db = apsw.Connection(
@@ -208,13 +207,14 @@ class SQLDB:
         self.execute(self.PRAGMAS)
         self.execute(self.CREATE_TABLES_QUERY)
         register_canonical_functions(self.db)
-        register_trending_functions(self.db)
         self.state_manager = Manager()
         self.blocked_streams = self.state_manager.dict()
         self.blocked_channels = self.state_manager.dict()
         self.filtered_streams = self.state_manager.dict()
         self.filtered_channels = self.state_manager.dict()
         self.update_blocked_and_filtered_claims()
+        for algorithm in self.trending:
+            algorithm.install(self.db)
 
     def close(self):
         if self.db is not None:
@@ -834,7 +834,8 @@ class SQLDB:
           update_claims, delete_claim_hashes, affected_channels, forward_timer=True)
         r(self.insert_supports, insert_supports)
         r(self.update_claimtrie, height, recalculate_claim_hashes, deleted_claim_names, forward_timer=True)
-        r(calculate_trending, self.db.cursor(), height, daemon_height)
+        for algorithm in self.trending:
+            r(algorithm.run, self.db.cursor(), height, daemon_height, recalculate_claim_hashes)
         if not self._fts_synced and self.main.first_sync and height == daemon_height:
             r(first_sync_finished, self.db.cursor())
             self._fts_synced = True
@@ -845,11 +846,15 @@ class LBRYLevelDB(LevelDB):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         path = os.path.join(self.env.db_dir, 'claims.db')
-        # space separated list of channel URIs used for filtering bad content
+        trending = []
+        for algorithm_name in set(self.env.default('TRENDING_ALGORITHMS', 'zscore').split(' ')):
+            if algorithm_name in TRENDING_ALGORITHMS:
+                trending.append(TRENDING_ALGORITHMS[algorithm_name])
         self.sql = SQLDB(
             self, path,
             self.env.default('BLOCKING_CHANNEL_IDS', '').split(' '),
             self.env.default('FILTERING_CHANNEL_IDS', '').split(' '),
+            trending
         )
 
     def close(self):

tests/unit/wallet/server/test_sqldb.py

@@ -10,7 +10,7 @@ from lbry.schema.claim import Claim
 from lbry.schema.result import Censor
 from lbry.wallet.server.db import reader, writer
 from lbry.wallet.server.coin import LBCRegTest
-from lbry.wallet.server.db.trending import TRENDING_WINDOW
+from lbry.wallet.server.db.trending import zscore
 from lbry.wallet.server.db.canonical import FindShortestID
 from lbry.wallet.server.block_processor import Timer
 from lbry.wallet.transaction import Transaction, Input, Output
@@ -47,7 +47,7 @@ class TestSQLDB(unittest.TestCase):
         self.daemon_height = 1
         self.coin = LBCRegTest()
         db_url = 'file:test_sqldb?mode=memory&cache=shared'
-        self.sql = writer.SQLDB(self, db_url, [], [])
+        self.sql = writer.SQLDB(self, db_url, [], [], [zscore])
         self.addCleanup(self.sql.close)
         self.sql.open()
         reader.initializer(
@@ -533,7 +533,7 @@ class TestTrending(TestSQLDB):
         up_biggly = self.get_stream('Claim E', COIN)
         claims = advance(1, [up_biggly, up_medium, up_small, no_trend, downwards])
         for window in range(1, 8):
-            advance(TRENDING_WINDOW * window, [
+            advance(zscore.TRENDING_WINDOW * window, [
                 self.get_support(downwards, (20-window)*COIN),
                 self.get_support(up_small, int(20+(window/10)*COIN)),
                 self.get_support(up_medium, (20+(window*(2 if window == 7 else 1)))*COIN),
@@ -549,8 +549,8 @@ class TestTrending(TestSQLDB):
     def test_edge(self):
         problematic = self.get_stream('Problem', COIN)
         self.advance(1, [problematic])
-        self.advance(TRENDING_WINDOW, [self.get_support(problematic, 53000000000)])
+        self.advance(zscore.TRENDING_WINDOW, [self.get_support(problematic, 53000000000)])
-        self.advance(TRENDING_WINDOW * 2, [self.get_support(problematic, 500000000)])
+        self.advance(zscore.TRENDING_WINDOW * 2, [self.get_support(problematic, 500000000)])
 
 
 class TestContentBlocking(TestSQLDB):