Suppress ImportWarning messages (#1419)

* - use uvloop in FreeBSD

* Supress ImportWarning messages

Author: rayrapetyan

eth/_warnings.py

@@ -0,0 +1,10 @@
+from contextlib import contextmanager
+import warnings
+
+
+# TODO: drop once https://github.com/cython/cython/issues/1720 is resolved
+@contextmanager
+def catch_and_ignore_import_warning():
+    with warnings.catch_warnings():
+        warnings.simplefilter('ignore', category=ImportWarning)
+        yield

eth/chains/base.py

@@ -28,18 +28,6 @@
     Hash32,
 )
 
-from eth_utils import (
-    to_set,
-    ValidationError,
-)
-from eth_utils.toolz import (
-    assoc,
-    compose,
-    groupby,
-    iterate,
-    take,
-)
-
 from eth.db.backends.base import BaseAtomicDB
 from eth.db.chain import (
     BaseChainDB,
@@ -103,6 +91,20 @@
     AccountState,
 )
 
+from eth._warnings import catch_and_ignore_import_warning
+with catch_and_ignore_import_warning():
+    from eth_utils import (
+        to_set,
+        ValidationError,
+    )
+    from eth_utils.toolz import (
+        assoc,
+        compose,
+        groupby,
+        iterate,
+        take,
+    )
+
 if TYPE_CHECKING:
     from eth.vm.base import BaseVM  # noqa: F401
 

eth/constants.py

@@ -2,7 +2,10 @@
     Address,
     Hash32
 )
-from eth_utils import denoms
+
+from eth._warnings import catch_and_ignore_import_warning
+with catch_and_ignore_import_warning():
+    from eth_utils import denoms
 
 
 ANY = 'any'

eth/db/backends/level.py

@@ -17,8 +17,11 @@
     BaseDB,
 )
 
+from eth._warnings import catch_and_ignore_import_warning
+
 if TYPE_CHECKING:
-    import plyvel  # noqa: F401
+    with catch_and_ignore_import_warning():
+        import plyvel  # noqa: F401
 
 
 class LevelDB(BaseAtomicDB):
@@ -29,7 +32,8 @@ def __init__(self, db_path: Path = None) -> None:
         if not db_path:
             raise TypeError("Please specifiy a valid path for your database.")
         try:
-            import plyvel  # noqa: F811
+            with catch_and_ignore_import_warning():
+                import plyvel  # noqa: F811
         except ImportError:
             raise ImportError(
                 "LevelDB requires the plyvel library which is not available for import."

eth/db/chain.py

@@ -13,23 +13,11 @@
     TYPE_CHECKING,
 )
 
-import rlp
-
-from trie import (
-    HexaryTrie,
-)
-
 from eth_typing import (
     BlockNumber,
     Hash32
 )
 
-from eth_utils import (
-    to_list,
-    to_tuple,
-    ValidationError,
-)
-
 from eth_hash.auto import keccak
 
 from eth.constants import (
@@ -57,6 +45,17 @@
 from eth.validation import (
     validate_word,
 )
+from eth._warnings import catch_and_ignore_import_warning
+with catch_and_ignore_import_warning():
+    import rlp
+    from trie import (
+        HexaryTrie,
+    )
+    from eth_utils import (
+        to_list,
+        to_tuple,
+        ValidationError,
+    )
 
 if TYPE_CHECKING:
     from eth.rlp.blocks import (  # noqa: F401

p2p/nat.py

@@ -18,7 +18,10 @@
 )
 import netifaces
 from p2p.service import BaseService
-import upnpclient
+
+from eth._warnings import catch_and_ignore_import_warning
+with catch_and_ignore_import_warning():
+    import upnpclient
 
 
 # UPnP discovery can take a long time, so use a loooong timeout here.

trinity/__init__.py

@@ -21,7 +21,11 @@ def is_uvloop_supported() -> bool:
 if is_uvloop_supported():
     # Set `uvloop` as the default event loop
     import asyncio  # noqa: E402
-    import uvloop  # noqa: E402
+
+    from eth._warnings import catch_and_ignore_import_warning
+    with catch_and_ignore_import_warning():
+        import uvloop  # noqa: E402
+
     asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
 
 from .main import (  # noqa: F401