Move backfill allocator tests to pytest

util/migrate/test/test_backfill_allocator.py

@@ -0,0 +1,176 @@
+import random
+
+import pytest
+
+from datetime import datetime, timedelta
+from util.migrate.allocator import CompletedKeys, NoAvailableKeysError, yield_random_entries
+
+def test_merge_blocks_operations():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+  candidates.mark_completed(1, 5)
+
+  assert candidates.is_available(5)
+  assert candidates.is_available(0)
+  assert not candidates.is_available(1)
+  assert not candidates.is_available(4)
+  assert not candidates.is_available(11)
+  assert not candidates.is_available(10)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 6
+
+  candidates.mark_completed(5, 6)
+  assert not candidates.is_available(5)
+  assert candidates.is_available(6)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 5
+
+  candidates.mark_completed(3, 8)
+  assert candidates.is_available(9)
+  assert candidates.is_available(8)
+  assert not candidates.is_available(7)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 3
+
+def test_adjust_max():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+  assert len(candidates._slabs) == 0
+
+  assert candidates.is_available(9)
+  candidates.mark_completed(5, 12)
+  assert len(candidates._slabs) == 0
+  assert candidates.num_remaining == 5
+
+  assert not candidates.is_available(9)
+  assert candidates.is_available(4)
+
+def test_adjust_min():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+  assert len(candidates._slabs) == 0
+
+  assert candidates.is_available(2)
+  candidates.mark_completed(0, 3)
+  assert len(candidates._slabs) == 0
+  assert candidates.num_remaining == 7
+
+  assert not candidates.is_available(2)
+  assert candidates.is_available(4)
+
+def test_inside_block():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+  candidates.mark_completed(1, 8)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 3
+
+  candidates.mark_completed(2, 5)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 3
+  assert not candidates.is_available(1)
+  assert not candidates.is_available(5)
+
+def test_wrap_block():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+  candidates.mark_completed(2, 5)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 7
+
+  candidates.mark_completed(1, 8)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 3
+  assert not candidates.is_available(1)
+  assert not candidates.is_available(5)
+
+def test_non_contiguous():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+
+  candidates.mark_completed(1, 5)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 6
+  assert candidates.is_available(5)
+  assert candidates.is_available(6)
+
+  candidates.mark_completed(6, 8)
+  assert len(candidates._slabs) == 2
+  assert candidates.num_remaining == 4
+  assert candidates.is_available(5)
+  assert not candidates.is_available(6)
+
+def test_big_merge():
+  candidates = CompletedKeys(10)
+  assert candidates.num_remaining == 10
+
+  candidates.mark_completed(1, 5)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 6
+
+  candidates.mark_completed(6, 8)
+  assert len(candidates._slabs) == 2
+  assert candidates.num_remaining == 4
+
+  candidates.mark_completed(5, 6)
+  assert len(candidates._slabs) == 1
+  assert candidates.num_remaining == 3
+
+def test_range_limits():
+  candidates = CompletedKeys(10)
+  assert not candidates.is_available(-1)
+  assert not candidates.is_available(10)
+
+  assert candidates.is_available(9)
+  assert candidates.is_available(0)
+
+def test_random_saturation():
+  candidates = CompletedKeys(100)
+  with pytest.raises(NoAvailableKeysError):
+    for _ in range(101):
+      start = candidates.get_block_start_index(10)
+      assert candidates.is_available(start)
+      candidates.mark_completed(start, start + 10)
+
+  assert candidates.num_remaining == 0
+
+def test_huge_dataset():
+  candidates = CompletedKeys(1024 * 1024)
+  start_time = datetime.now()
+  iterations = 0
+  with pytest.raises(NoAvailableKeysError):
+    while (datetime.now() - start_time) < timedelta(seconds=10):
+      start = candidates.get_block_start_index(1024)
+      assert candidates.is_available(start)
+      candidates.mark_completed(start, start + random.randint(512, 1024))
+      iterations += 1
+
+  assert iterations > 1024
+  assert candidates.num_remaining == 0
+
+
+class FakeQuery(object):
+  def __init__(self, result_list):
+    self._result_list = result_list
+
+  def limit(self, *args, **kwargs):
+    return self
+
+  def where(self, *args, **kwargs):
+    return self
+
+  def order_by(self, *args, **kwargs):
+    return self
+
+  def __iter__(self):
+    return self._result_list.__iter__()
+
+
+FAKE_PK_FIELD = 10  # Must be able to compare to integers
+
+def test_no_work():
+  def create_empty_query():
+    return FakeQuery([])
+
+  for _ in yield_random_entries(create_empty_query, FAKE_PK_FIELD, 1, 10):
+    assert False, 'There should never be any actual work!'