Add shim for module '_contextvars'.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/Python3Core.java

@@ -52,6 +52,7 @@
 import com.oracle.graal.python.builtins.modules.BuiltinFunctions;
 import com.oracle.graal.python.builtins.modules.CodecsModuleBuiltins;
 import com.oracle.graal.python.builtins.modules.CollectionsModuleBuiltins;
+import com.oracle.graal.python.builtins.modules.ContextvarsModuleBuiltins;
 import com.oracle.graal.python.builtins.modules.CtypesModuleBuiltins;
 import com.oracle.graal.python.builtins.modules.ErrnoModuleBuiltins;
 import com.oracle.graal.python.builtins.modules.FaulthandlerModuleBuiltins;
@@ -227,7 +228,8 @@ private static final String[] initializeCoreFiles() {
                         "zipimport",
                         "mmap",
                         "_queue",
-                        "_ast"));
+                        "_ast",
+                        "_contextvars"));
 
         return coreFiles.toArray(new String[coreFiles.size()]);
     }
@@ -338,7 +340,8 @@ private static final PythonBuiltins[] initializeBuiltins() {
                         new ThreadModuleBuiltins(),
                         new ThreadBuiltins(),
                         new LockBuiltins(),
-                        new RLockBuiltins()));
+                        new RLockBuiltins(),
+                        new ContextvarsModuleBuiltins()));
         if (!TruffleOptions.AOT) {
             ServiceLoader<PythonBuiltins> providers = ServiceLoader.load(PythonBuiltins.class);
             for (PythonBuiltins builtin : providers) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ContextvarsModuleBuiltins.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.oracle.graal.python.builtins.modules;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.oracle.graal.python.builtins.CoreFunctions;
+import com.oracle.graal.python.builtins.PythonBuiltins;
+import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
+import com.oracle.truffle.api.dsl.NodeFactory;
+
+@CoreFunctions(defineModule = "_contextvars")
+public class ContextvarsModuleBuiltins extends PythonBuiltins {
+
+    @Override
+    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
+        return Collections.emptyList();
+    }
+
+}

graalpython/lib-graalpython/_contextvars.py

@@ -0,0 +1,67 @@
+# Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# The Universal Permissive License (UPL), Version 1.0
+#
+# Subject to the condition set forth below, permission is hereby granted to any
+# person obtaining a copy of this software, associated documentation and/or
+# data (collectively the "Software"), free of charge and under any and all
+# copyright rights in the Software, and any and all patent rights owned or
+# freely licensable by each licensor hereunder covering either (i) the
+# unmodified Software as contributed to or provided by such licensor, or (ii)
+# the Larger Works (as defined below), to deal in both
+#
+# (a) the Software, and
+#
+# (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+# one is included with the Software each a "Larger Work" to which the Software
+# is contributed by such licensors),
+#
+# without restriction, including without limitation the rights to copy, create
+# derivative works of, display, perform, and distribute the Software and make,
+# use, sell, offer for sale, import, export, have made, and have sold the
+# Software and the Larger Work(s), and to sublicense the foregoing rights on
+# either these or other terms.
+#
+# This license is subject to the following condition:
+#
+# The above copyright notice and either this complete permission notice or at a
+# minimum a reference to the UPL must be included in all copies or substantial
+# portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+class Context:
+    pass
+
+
+class ContextVar:
+    def __init__(self, name, default=None):
+        self._name = name
+        self._value = default
+                
+    def get(self):
+        if self._value is None:
+            raise LookupError
+        return self._value
+    
+    def set(self, value):
+        self._value = value
+        
+    def reset(self, token):
+        pass
+
+
+class Token:
+    pass
+
+
+def copy_context():
+    raise NotImplementedError
+