chore: import upstream snapshot with attribution

rust/perspective-python/perspective/tests/multi_threaded/__init__.py

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+#  ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+#  ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
+#  ┃ ▄▄▄▄▄█ █▄▄▄▄▄ ▄▄▄▄▄█  ▀▀▀▀▀█▀▀▀▀▀ █ ▀▀▀▀▀█ ████████▌▐███ ███▄  ▀█ █ ▀▀▀▀▀ ┃
+#  ┃ █▀▀▀▀▀ █▀▀▀▀▀ █▀██▀▀ ▄▄▄▄▄ █ ▄▄▄▄▄█ ▄▄▄▄▄█ ████████▌▐███ █████▄   █ ▄▄▄▄▄ ┃
+#  ┃ █      ██████ █  ▀█▄       █ ██████      █      ███▌▐███ ███████▄ █       ┃
+#  ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
+#  ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
+#  ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
+#  ┃ This file is part of the Perspective library, distributed under the terms ┃
+#  ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
+#  ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

rust/perspective-python/perspective/tests/multi_threaded/test_multi_threaded.py

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+#  ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+#  ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
+#  ┃ ▄▄▄▄▄█ █▄▄▄▄▄ ▄▄▄▄▄█  ▀▀▀▀▀█▀▀▀▀▀ █ ▀▀▀▀▀█ ████████▌▐███ ███▄  ▀█ █ ▀▀▀▀▀ ┃
+#  ┃ █▀▀▀▀▀ █▀▀▀▀▀ █▀██▀▀ ▄▄▄▄▄ █ ▄▄▄▄▄█ ▄▄▄▄▄█ ████████▌▐███ █████▄   █ ▄▄▄▄▄ ┃
+#  ┃ █      ██████ █  ▀█▄       █ ██████      █      ███▌▐███ ███████▄ █       ┃
+#  ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
+#  ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
+#  ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
+#  ┃ This file is part of the Perspective library, distributed under the terms ┃
+#  ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
+#  ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+from perspective import Server
+
+import asyncio
+import random
+import threading
+
+from random import sample
+from string import ascii_letters
+from threading import Thread
+from time import sleep
+
+class TestServer(object):
+    def test_sync_updates_with_loop_callback_are_sync(self):
+        def feed(table):
+            y = 1000
+            while y > 0:
+                y -= 1
+                table.update([{"a": random.randint(0, 10), "index": y}])
+
+        perspective_server = Server()
+        loop = asyncio.new_event_loop()
+        thread = threading.Thread(target=loop.run_forever)
+        thread.start()
+
+        client = perspective_server.new_local_client()
+        table = client.table(
+            {"a": "integer", "index": "integer"}, index="index", name="test"
+        )
+
+        view = table.view()
+        global count
+        count = 0
+
+        def update(x):
+            global count
+            count += 1
+
+        view.on_update(update)
+        feed(table)
+        assert table.size() == 1000
+        assert count == 1000
+        loop.call_soon_threadsafe(loop.stop)
+        thread.join()
+        loop.close()
+
+    def test_concurrent_updates(self):
+        async def feed(table, loop):
+            y = 1000
+            while y > 0:
+                y -= 1
+                table.update([{"a": random.randint(0, 10), "index": y}])
+                await asyncio.sleep(0.001)
+
+        perspective_server = Server()
+        loop = asyncio.new_event_loop()
+        thread = threading.Thread(target=loop.run_forever)
+        thread.start()
+
+        client = perspective_server.new_local_client()
+        table = client.table(
+            {"a": "integer", "index": "integer"}, index="index", name="test"
+        )
+
+        view = table.view()
+        global count
+        count = 0
+
+        def update(x):
+            global count
+            count += 1
+
+        view.on_update(update)
+        asyncio.run_coroutine_threadsafe(feed(table, loop), loop).result()
+        assert table.size() == 1000
+        assert count == 1000
+        loop.call_soon_threadsafe(loop.stop)
+        thread.join()
+        loop.close()
+
+    def test_concurrent_updates_with_limit_tables_are_threadsafe(self):
+        TEST_ITERATIONS = 100
+        global running
+        perspective_server = Server()
+        client = perspective_server.new_local_client()
+        table = client.table(
+            {"col{}".format(i): "integer" for i in range(100)}, limit=100
+        )
+
+        running = True
+
+        # Create an updating thread that overlaps the index alot
+        def feed(table):
+            row = {"col{}".format(i): random.randint(0, 100) for i in range(100)}
+            while running:
+                table.update([row for _ in range(100)])
+
+        thread = threading.Thread(target=feed, args=(table,))
+        thread.start()
+
+        results = []
+
+        # Create a thread that serialized the table alot, checking for nulls
+        def feed2(table):
+            global running
+            view = table.view()
+            while len(results) < TEST_ITERATIONS:
+                arr = view.to_arrow()
+                table2 = client.table(arr)
+                view2 = table2.view()
+                json = view2.to_json(end_row=1)
+                view2.delete()
+                table2.delete()
+                results.append(json)
+
+            view.delete()
+            running = False
+
+        thread2 = threading.Thread(target=feed2, args=(table,))
+        thread2.start()
+
+        thread.join()
+        thread2.join()
+
+        assert table.size() == 100
+        for result in results:
+            for row in result:
+                for col, val in row.items():
+                    assert val is not None
+
+        table.delete()
+
+    def test_concurrent_view_creation_on_separate_servers_are_threadsafe(self):
+        def run_perspective():
+            x = 1000
+            s = Server()
+            c = s.new_local_client()
+            t = c.table({"a": "string", "b": int})
+            t.view(expressions=["//tmp\nfalse"])
+            while x > 0:
+                t.update([{"a": "foo", "b": 42}])
+                x -= 1
+
+        thread1 = threading.Thread(target=run_perspective, daemon=True)
+        thread2 = threading.Thread(target=run_perspective, daemon=True)
+        thread1.start()
+        thread2.start()
+        thread1.join()
+        thread2.join()
+
+    def test_concurrent_view_creation_with_updates_are_threadsafe(self):
+        global running
+        s = Server()
+        schema = {
+            "a": "string",
+            "b": "string",
+            "c": "string",
+        }
+
+        group_bys = ["a", "b", "c"]
+        c = s.new_local_client()
+        t = c.table(schema, limit=10000)
+        running = True
+
+        def gen_views():
+            global running
+            for _ in range(100):
+                t.view(columns=list(schema.keys()), group_by=group_bys)
+                sleep(0.01)
+            running = False
+
+        def run_psp():
+            global running
+            while running:
+                t.update(
+                    [
+                        {
+                            "a": "".join(sample(ascii_letters, 4)),
+                            "b": "".join(sample(ascii_letters, 4)),
+                            "c": "".join(sample(ascii_letters, 4)),
+                        }
+                    ]
+                )
+
+        thread1 = Thread(target=run_psp, daemon=True)
+        thread2 = Thread(target=gen_views, daemon=True)
+        thread1.start()
+        thread2.start()
+        thread1.join()
+        thread2.join()