Improve seed generation for containers names in tests

b2sdk/_internal/testing/fixtures/buckets.py

@@ -35,13 +35,13 @@ def dont_cleanup_old_buckets(request):
 
 
 @pytest.fixture(scope='session')
-def bucket_name_prefix():
-    return get_bucket_name_prefix(8)
+def general_bucket_name_prefix():
+    return GENERAL_BUCKET_NAME_PREFIX
 
 
 @pytest.fixture(scope='session')
-def general_bucket_name_prefix():
-    return GENERAL_BUCKET_NAME_PREFIX
+def bucket_name_prefix(general_bucket_name_prefix):
+    return get_bucket_name_prefix(8, general_bucket_name_prefix)
 
 
 @pytest.fixture(scope='session')

b2sdk/_internal/testing/helpers/bucket_manager.py

@@ -10,7 +10,6 @@
 from __future__ import annotations
 
 import logging
-import platform
 from collections.abc import Iterable
 from datetime import datetime, timedelta
 from itertools import chain
@@ -26,11 +25,11 @@
     BUCKET_CREATED_AT_MILLIS,
     BUCKET_NAME_LENGTH,
     GENERAL_BUCKET_NAME_PREFIX,
-    random_token,
+    NODE_DESCRIPTION,
+    bucket_name_part,
 )
 from b2sdk._internal.utils import current_time_millis
 
-NODE_DESCRIPTION = f'{platform.node()}: {platform.platform()}'
 ONE_HOUR_MILLIS = 60 * 60 * 1000
 BUCKET_CLEANUP_PERIOD_MILLIS = timedelta(hours=3).total_seconds() * 1000
 
@@ -52,7 +51,7 @@ def __init__(
         self.bucket_name_log: list[str] = []
 
     def new_bucket_name(self) -> str:
-        bucket_name = self.current_run_prefix + random_token(
+        bucket_name = self.current_run_prefix + bucket_name_part(
             BUCKET_NAME_LENGTH - len(self.current_run_prefix)
         )
         self.bucket_name_log.append(bucket_name)

b2sdk/_internal/testing/helpers/buckets.py

@@ -9,20 +9,62 @@
 ######################################################################
 from __future__ import annotations
 
+import logging
+import os
+import platform
+import random
 import secrets
+import time
+from hashlib import sha256
 
 from b2sdk._internal.http_constants import BUCKET_NAME_CHARS_UNIQ, BUCKET_NAME_LENGTH_RANGE
 
+logger = logging.getLogger(__name__)
+
 GENERAL_BUCKET_NAME_PREFIX = 'sdktst'
 BUCKET_NAME_LENGTH = BUCKET_NAME_LENGTH_RANGE[1]
 BUCKET_CREATED_AT_MILLIS = 'created_at_millis'
+NODE_DESCRIPTION = f'{platform.node()}: {platform.platform()} {platform.python_version()}'
+
+
+def get_seed() -> str:
+    """
+    Get seed for random number generator.
+
+    The `WORKFLOW_ID` variable has to be set in the CI to uniquely identify
+    the current workflow (including the attempt)
+    """
+    seed = ''.join(
+        (
+            os.getenv('WORKFLOW_ID', secrets.token_hex(8)),
+            NODE_DESCRIPTION,
+            str(time.time_ns()),
+            os.getenv('PYTEST_XDIST_WORKER', 'gw0'),
+        )
+    )
+    return sha256(seed.encode()).hexdigest()[:16]
 
-RNG = secrets.SystemRandom()
+
+RNG_SEED = get_seed()
+RNG = random.Random(RNG_SEED)
+RNG_COUNTER = 0
 
 
 def random_token(length: int, chars: str = BUCKET_NAME_CHARS_UNIQ) -> str:
     return ''.join(RNG.choice(chars) for _ in range(length))
 
 
-def get_bucket_name_prefix(rnd_len: int = 8) -> str:
-    return GENERAL_BUCKET_NAME_PREFIX + random_token(rnd_len)
+def bucket_name_part(length: int) -> str:
+    assert length >= 1
+    global RNG_COUNTER
+    RNG_COUNTER += 1
+    name_part = random_token(length, BUCKET_NAME_CHARS_UNIQ)
+    logger.info('RNG_SEED: %s', RNG_SEED)
+    logger.info('RNG_COUNTER: %i, length: %i', RNG_COUNTER, length)
+    logger.info('name_part: %s', name_part)
+    logger.info('WORKFLOW_ID: %s', os.getenv('WORKFLOW_ID'))
+    return name_part
+
+
+def get_bucket_name_prefix(rnd_len: int = 8, prefix: str = GENERAL_BUCKET_NAME_PREFIX) -> str:
+    return prefix + bucket_name_part(rnd_len)

b2sdk/v3/testing/__init__.py

@@ -17,12 +17,14 @@
     GENERAL_BUCKET_NAME_PREFIX,
     BUCKET_NAME_LENGTH,
     BUCKET_CREATED_AT_MILLIS,
+    NODE_DESCRIPTION,
     RNG,
-    random_token,
+    RNG_COUNTER,
+    RNG_SEED,
     get_bucket_name_prefix,
+    random_token,
 )
 from b2sdk._internal.testing.helpers.bucket_manager import (
-    NODE_DESCRIPTION,
     ONE_HOUR_MILLIS,
     BUCKET_CLEANUP_PERIOD_MILLIS,
     BucketManager,

changelog.d/+tests-seed-generation.changed.md

@@ -0,0 +1 @@
+Improve seed generation for containers' names in tests.

test/integration/conftest.py

@@ -9,4 +9,4 @@
 ######################################################################
 
 
-pytest_plugins = ["b2sdk.v3.testing"]
+pytest_plugins = ['b2sdk.v3.testing']