Create a new wheel_builder module and move WheelBuilder+friends

src/pip/_internal/commands/install.py

@@ -42,15 +42,15 @@
 from pip._internal.utils.temp_dir import TempDirectory
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 from pip._internal.utils.virtualenv import virtualenv_no_global
-from pip._internal.wheel import WheelBuilder
+from pip._internal.wheel_builder import WheelBuilder
 
 if MYPY_CHECK_RUNNING:
     from optparse import Values
     from typing import Any, List, Optional
 
     from pip._internal.models.format_control import FormatControl
     from pip._internal.req.req_install import InstallRequirement
-    from pip._internal.wheel import BinaryAllowedPredicate
+    from pip._internal.wheel_builder import BinaryAllowedPredicate
 
 
 logger = logging.getLogger(__name__)

src/pip/_internal/commands/wheel.py

@@ -16,7 +16,7 @@
 from pip._internal.req.req_tracker import RequirementTracker
 from pip._internal.utils.temp_dir import TempDirectory
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
-from pip._internal.wheel import WheelBuilder
+from pip._internal.wheel_builder import WheelBuilder
 
 if MYPY_CHECK_RUNNING:
     from optparse import Values

src/pip/_internal/utils/misc.py

@@ -7,6 +7,7 @@
 import contextlib
 import errno
 import getpass
+import hashlib
 import io
 import logging
 import os
@@ -868,3 +869,17 @@ def is_console_interactive():
     """Is this console interactive?
     """
     return sys.stdin is not None and sys.stdin.isatty()
+
+
+def hash_file(path, blocksize=1 << 20):
+    # type: (str, int) -> Tuple[Any, int]
+    """Return (hash, length) for path using hashlib.sha256()
+    """
+
+    h = hashlib.sha256()
+    length = 0
+    with open(path, 'rb') as f:
+        for block in read_chunks(f, size=blocksize):
+            length += len(block)
+            h.update(block)
+    return (h, length)  # type: ignore