Cache supported tags for wheels (#3805)

changelog.d/3804.misc.rst

@@ -0,0 +1 @@
+Cache supported tags for wheels.

setuptools/tests/test_wheel.py

@@ -609,9 +609,11 @@ def test_wheel_no_dist_dir():
 
 def test_wheel_is_compatible(monkeypatch):
     def sys_tags():
-        for t in parse_tag('cp36-cp36m-manylinux1_x86_64'):
-            yield t
-    monkeypatch.setattr('setuptools.wheel.sys_tags', sys_tags)
+        return {
+            (t.interpreter, t.abi, t.platform)
+            for t in parse_tag('cp36-cp36m-manylinux1_x86_64')
+        }
+    monkeypatch.setattr('setuptools.wheel._get_supported_tags', sys_tags)
     assert Wheel(
         'onnxruntime-0.1.2-cp36-cp36m-manylinux1_x86_64.whl').is_compatible()
 

setuptools/wheel.py

@@ -2,6 +2,7 @@
 
 import email
 import itertools
+import functools
 import os
 import posixpath
 import re
@@ -28,6 +29,14 @@
     "__import__('pkg_resources').declare_namespace(__name__)\n"
 
 
+@functools.lru_cache(maxsize=None)
+def _get_supported_tags():
+    # We calculate the supported tags only once, otherwise calling
+    # this method on thousands of wheels takes seconds instead of
+    # milliseconds.
+    return {(t.interpreter, t.abi, t.platform) for t in sys_tags()}
+
+
 def unpack(src_dir, dst_dir):
     '''Move everything under `src_dir` to `dst_dir`, and delete the former.'''
     for dirpath, dirnames, filenames in os.walk(src_dir):
@@ -82,10 +91,8 @@ def tags(self):
         )
 
     def is_compatible(self):
-        '''Is the wheel is compatible with the current platform?'''
-        supported_tags = set(
-            (t.interpreter, t.abi, t.platform) for t in sys_tags())
-        return next((True for t in self.tags() if t in supported_tags), False)
+        '''Is the wheel compatible with the current platform?'''
+        return next((True for t in self.tags() if t in _get_supported_tags()), False)
 
     def egg_name(self):
         return _egg_basename(