1 files changed, 117 insertions, 0 deletions
diff --git a/contrib/python/grpcio/py3/support.py b/contrib/python/grpcio/py3/support.py
new file mode 100644
index 0000000000..3d64b3170c
--- /dev/null
+++ b/contrib/python/grpcio/py3/support.py
@@ -0,0 +1,117 @@
+# Copyright 2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from distutils import errors
+import os
+import os.path
+import shutil
+import sys
+import tempfile
+
+import commands
+
+C_PYTHON_DEV = """
+#include <Python.h>
+int main(int argc, char **argv) { return 0; }
+"""
+C_PYTHON_DEV_ERROR_MESSAGE = """
+Could not find <Python.h>. This could mean the following:
+  * You're on Ubuntu and haven't run `apt-get install <PY_REPR>-dev`.
+  * You're on RHEL/Fedora and haven't run `yum install <PY_REPR>-devel` or
+    `dnf install <PY_REPR>-devel` (make sure you also have redhat-rpm-config
+    installed)
+  * You're on Mac OS X and the usual Python framework was somehow corrupted
+    (check your environment variables or try re-installing?)
+  * You're on Windows and your Python installation was somehow corrupted
+    (check your environment variables or try re-installing?)
+"""
+if sys.version_info[0] == 2:
+    PYTHON_REPRESENTATION = 'python'
+elif sys.version_info[0] == 3:
+    PYTHON_REPRESENTATION = 'python3'
+else:
+    raise NotImplementedError('Unsupported Python version: %s' % sys.version)
+
+C_CHECKS = {
+    C_PYTHON_DEV:
+        C_PYTHON_DEV_ERROR_MESSAGE.replace('<PY_REPR>', PYTHON_REPRESENTATION),
+}
+
+
+def _compile(compiler, source_string):
+    tempdir = tempfile.mkdtemp()
+    cpath = os.path.join(tempdir, 'a.c')
+    with open(cpath, 'w') as cfile:
+        cfile.write(source_string)
+    try:
+        compiler.compile([cpath])
+    except errors.CompileError as error:
+        return error
+    finally:
+        shutil.rmtree(tempdir)
+
+
+def _expect_compile(compiler, source_string, error_message):
+    if _compile(compiler, source_string) is not None:
+        sys.stderr.write(error_message)
+        raise commands.CommandError(
+            "Diagnostics found a compilation environment issue:\n{}".format(
+                error_message))
+
+
+def diagnose_compile_error(build_ext, error):
+    """Attempt to diagnose an error during compilation."""
+    for c_check, message in C_CHECKS.items():
+        _expect_compile(build_ext.compiler, c_check, message)
+    python_sources = [
+        source for source in build_ext.get_source_files()
+        if source.startswith('./src/python') and source.endswith('c')
+    ]
+    for source in python_sources:
+        if not os.path.isfile(source):
+            raise commands.CommandError((
+                "Diagnostics found a missing Python extension source file:\n{}\n\n"
+                "This is usually because the Cython sources haven't been transpiled "
+                "into C yet and you're building from source.\n"
+                "Try setting the environment variable "
+                "`GRPC_PYTHON_BUILD_WITH_CYTHON=1` when invoking `setup.py` or "
+                "when using `pip`, e.g.:\n\n"
+                "pip install -rrequirements.txt\n"
+                "GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install .").format(source))
+
+
+def diagnose_attribute_error(build_ext, error):
+    if any('_needs_stub' in arg for arg in error.args):
+        raise commands.CommandError(
+            "We expect a missing `_needs_stub` attribute from older versions of "
+            "setuptools. Consider upgrading setuptools.")
+
+
+_ERROR_DIAGNOSES = {
+    errors.CompileError: diagnose_compile_error,
+    AttributeError: diagnose_attribute_error,
+}
+
+
+def diagnose_build_ext_error(build_ext, error, formatted):
+    diagnostic = _ERROR_DIAGNOSES.get(type(error))
+    if diagnostic is None:
+        raise commands.CommandError(
+            "\n\nWe could not diagnose your build failure. If you are unable to "
+            "proceed, please file an issue at http://www.github.com/grpc/grpc "
+            "with `[Python install]` in the title; please attach the whole log "
+            "(including everything that may have appeared above the Python "
+            "backtrace).\n\n{}".format(formatted))
+    else:
+        diagnostic(build_ext, error)