PYTHON-5529 Introduce optin setting to await for MinPoolSize population

test/asynchronous/test_client.py

@@ -2398,7 +2398,7 @@ def test_gevent_timeout_when_creating_connection(self):
         client = self.async_rs_or_single_client()
         self.addCleanup(client.close)
         coll = client.pymongo_test.test
-        pool = async_get_pool(client)
+        pool = async_get_pool(client)  # type:ignore
 
         # Patch the pool to delay the connect method.
         def delayed_connect(*args, **kwargs):

test/asynchronous/unified_format.py

@@ -329,6 +329,17 @@ async def _create_entity(self, entity_spec, uri=None):
                 kwargs["h"] = uri
             client = await self.test.async_rs_or_single_client(**kwargs)
             await client.aconnect()
+            # Wait for pool to be populated.
+            if "awaitMinPoolSizeMS" in spec:
+                pool = await async_get_pool(client)
+                t0 = time.monotonic()
+                while True:
+                    if (time.monotonic() - t0) > spec["awaitMinPoolSizeMS"] * 1000:
+                        raise ValueError("Test timed out during awaitMinPoolSize")
+                    async with pool.lock:
+                        if len(pool.conns) + pool.active_sockets >= pool.opts.min_pool_size:
+                            break
+                    await asyncio.sleep(0.1)
             self[spec["id"]] = client
             return
         elif entity_type == "database":
@@ -463,7 +474,7 @@ class UnifiedSpecTestMixinV1(AsyncIntegrationTest):
     a class attribute ``TEST_SPEC``.
     """
 
-    SCHEMA_VERSION = Version.from_string("1.25")
+    SCHEMA_VERSION = Version.from_string("1.26")
     RUN_ON_LOAD_BALANCER = True
     TEST_SPEC: Any
     TEST_PATH = ""  # This gets filled in by generate_test_classes
@@ -1551,7 +1562,6 @@ async def test_case(self):
                 if re.search(fail_pattern, description):
                     test_method = unittest.expectedFailure(test_method)
                     break
-
             setattr(cls, test_name, test_method)
 
 

test/asynchronous/utils.py

@@ -28,25 +28,25 @@
 
 from bson.son import SON
 from pymongo import AsyncMongoClient
+from pymongo.asynchronous.pool import Pool, _CancellationContext, _PoolGeneration
 from pymongo.errors import ConfigurationError
 from pymongo.hello import HelloCompat
 from pymongo.lock import _async_create_lock
 from pymongo.operations import _Op
 from pymongo.read_preferences import ReadPreference
 from pymongo.server_selectors import any_server_selector, writable_server_selector
-from pymongo.synchronous.pool import _CancellationContext, _PoolGeneration
 
 _IS_SYNC = False
 
 
-async def async_get_pool(client):
+async def async_get_pool(client: AsyncMongoClient) -> Pool:
     """Get the standalone, primary, or mongos pool."""
     topology = await client._get_topology()
     server = await topology._select_server(writable_server_selector, _Op.TEST)
     return server.pool
 
 
-async def async_get_pools(client):
+async def async_get_pools(client: AsyncMongoClient) -> list[Pool]:
     """Get all pools."""
     return [
         server.pool

test/csot/command-execution.json

@@ -1,6 +1,6 @@
 {
   "description": "timeoutMS behaves correctly during command execution",
-  "schemaVersion": "1.9",
+  "schemaVersion": "1.26",
   "runOnRequirements": [
     {
       "minServerVersion": "4.4.7",
@@ -69,8 +69,10 @@
                     "appName": "reduceMaxTimeMSTest",
                     "w": 1,
                     "timeoutMS": 500,
-                    "heartbeatFrequencyMS": 500
+                    "heartbeatFrequencyMS": 500,
+                    "minPoolSize": 1
                   },
+                  "awaitMinPoolSizeMS": 10000,
                   "observeEvents": [
                     "commandStartedEvent"
                   ]
@@ -185,8 +187,10 @@
                     "appName": "rttTooHighTest",
                     "w": 1,
                     "timeoutMS": 10,
-                    "heartbeatFrequencyMS": 500
+                    "heartbeatFrequencyMS": 500,
+                    "minPoolSize": 1
                   },
+                  "awaitMinPoolSizeMS": 10000,
                   "observeEvents": [
                     "commandStartedEvent"
                   ]
@@ -316,8 +320,10 @@
                     "appName": "reduceMaxTimeMSTest",
                     "w": 1,
                     "timeoutMS": 90,
-                    "heartbeatFrequencyMS": 100000
+                    "heartbeatFrequencyMS": 100000,
+                    "minPoolSize": 1
                   },
+                  "awaitMinPoolSizeMS": 10000,
                   "observeEvents": [
                     "commandStartedEvent"
                   ]

test/csot/convenient-transactions.json

@@ -1,6 +1,6 @@
 {
   "description": "timeoutMS behaves correctly for the withTransaction API",
-  "schemaVersion": "1.9",
+  "schemaVersion": "1.26",
   "runOnRequirements": [
     {
       "minServerVersion": "4.4",
@@ -21,8 +21,10 @@
       "client": {
         "id": "client",
         "uriOptions": {
-          "timeoutMS": 500
+          "timeoutMS": 500,
+          "minPoolSize": 1
         },
+        "awaitMinPoolSizeMS": 10000,
         "useMultipleMongoses": false,
         "observeEvents": [
           "commandStartedEvent"

test/csot/error-transformations.json

@@ -1,6 +1,6 @@
 {
   "description": "MaxTimeMSExpired server errors are transformed into a custom timeout error",
-  "schemaVersion": "1.9",
+  "schemaVersion": "1.26",
   "runOnRequirements": [
     {
       "minServerVersion": "4.0",
@@ -26,8 +26,10 @@
       "client": {
         "id": "client",
         "uriOptions": {
-          "timeoutMS": 250
+          "timeoutMS": 250,
+          "minPoolSize": 1
         },
+        "awaitMinPoolSizeMS": 10000,
         "useMultipleMongoses": false,
         "observeEvents": [
           "commandStartedEvent"