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Project description
Package for gRPC Python tools.
Installation
The gRPC Python tools package is available for Linux, Mac OS X, and Windows running Python 2.7.
From PyPI
If you are installing locally…
$ pip install grpcio-tools
Else system wide (on Ubuntu)…
$ sudo pip install grpcio-tools
If you’re on Windows make sure that you installed the pip.exe component
when you installed Python (if not go back and install it!) then invoke:
$ pip.exe install grpcio-tools
Windows users may need to invoke pip.exe from a command line ran as
administrator.
n.b. On Windows and on Mac OS X one must have a recent release of pip
to retrieve the proper wheel from PyPI. Be sure to upgrade to the latest
version!
You might also need to install Cython to handle installation via the source distribution if gRPC Python’s system coverage with wheels does not happen to include your system.
From Source
Building from source requires that you have the Python headers (usually a
package named python-dev) and Cython installed. It further requires a
GCC-like compiler to go smoothly; you can probably get it to work without
GCC-like stuff, but you may end up having a bad time.
$ export REPO_ROOT=grpc # REPO_ROOT can be any directory of your choice $ git clone -b $(curl -L http://grpc.io/release) https://github.com/grpc/grpc $REPO_ROOT $ cd $REPO_ROOT $ git submodule update --init $ cd tools/distrib/python/grpcio_tools $ python ../make_grpcio_tools.py # For the next command do `sudo pip install` if you get permission-denied errors $ pip install .
You cannot currently install Python from source on Windows. Things might work out for you in MSYS2 (follow the Linux instructions), but it isn’t officially supported at the moment.
Troubleshooting
Help, I …
… see a
pkg_resources.VersionConflictwhen I try to install grpcThis is likely because
pipdoesn’t own the offending dependency, which in turn is likely because your operating system’s package manager owns it. You’ll need to force the installation of the dependency:pip install --ignore-installed $OFFENDING_DEPENDENCYFor example, if you get an error like the following:
Traceback (most recent call last): File "<string>", line 17, in <module> ... File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 509, in find raise VersionConflict(dist, req) pkg_resources.VersionConflict: (six 1.8.0 (/usr/lib/python2.7/dist-packages), Requirement.parse('six>=1.10'))You can fix it by doing:
sudo pip install --ignore-installed six
… see compiler errors on some platforms when either installing from source or from the source distribution
If you see
/tmp/pip-build-U8pSsr/cython/Cython/Plex/Scanners.c:4:20: fatal error: Python.h: No such file or directory #include "Python.h" ^ compilation terminated.You can fix it by installing python-dev package. i.e
sudo apt-get install python-dev
If you see something similar to:
third_party/protobuf/src/google/protobuf/stubs/mathlimits.h:173:31: note: in expansion of macro 'SIGNED_INT_MAX' static const Type kPosMax = SIGNED_INT_MAX(Type); \\ ^And your toolchain is GCC (at the time of this writing, up through at least GCC 6.0), this is probably a bug where GCC chokes on constant expressions when the
-fwrapvflag is specified. You should consider setting your environment withCFLAGS=-fno-wrapvor using clang (CC=clang).
Usage
Given protobuf include directories $INCLUDE, an output directory
$OUTPUT, and proto files $PROTO_FILES, invoke as:
$ python -m grpc.tools.protoc -I$INCLUDE --python_out=$OUTPUT --grpc_python_out=$OUTPUT $PROTO_FILES
To use as a build step in distutils-based projects, you may use the provided
command class in your setup.py:
setuptools.setup(
# ...
cmdclass={
'build_proto_modules': grpc.tools.command.BuildPackageProtos,
}
# ...
)
Invocation of the command will walk the project tree and transpile every
.proto file into a _pb2.py file in the same directory.
Note that this particular approach requires grpcio-tools to be
installed on the machine before the setup script is invoked (i.e. no
combination of setup_requires or install_requires will provide
access to grpc.tools.command.BuildPackageProtos if it isn’t already
installed). One way to work around this can be found in our
grpcio-health-checking
package:
class BuildPackageProtos(setuptools.Command):
"""Command to generate project *_pb2.py modules from proto files."""
# ...
def run(self):
from grpc.tools import command
command.build_package_protos(self.distribution.package_dir[''])
Now including grpcio-tools in setup_requires will provide the
command on-setup as desired.
For more information on command classes, consult distutils and
setuptools documentation.
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