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# How to contribute
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We definitely welcome patches and contribution to grpc! Here is some guideline
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and information about how to do so.
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## Getting started
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### Legal requirements
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In order to protect both you and ourselves, you will need to sign the
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[Contributor License Agreement](https://cla.developers.google.com/clas).
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### Technical requirements
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You will need several tools to work with this repository. In addition to all of
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the packages described in the [INSTALL](INSTALL.md) file, you will also need
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python, and the mako template renderer. To install the latter, using pip, one
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should simply be able to do `pip install mako`.
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In order to run all of the tests we provide, you will need valgrind and clang.
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More specifically, under debian, you will need the package libc++-dev to
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properly run all the tests.
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Compiling and running grpc C++ tests depend on protobuf 3.0.0, gtest and gflags.
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Although gflags is provided in third_party, you will need to manually install
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that dependency on your system to run these tests. Under a Debian or Ubuntu
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system, you can install the gtests and gflags packages using apt-get:
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```sh
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$ [sudo] apt-get install libgflags-dev libgtest-dev
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```
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If you are planning to work on any of the languages other than C and C++, you
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will also need their appropriate development environments.
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If you want to work under Windows, we recommend the use of Visual Studio 2013.
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The [Community or Express editions](http://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx)
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are free and suitable for developing with grpc. Note however that our test
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environment and tools are available for Unix environments only at the moment.
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## Testing your changes
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We provide a tool to help run the suite of tests in various environments.
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In order to run most of the available tests, one would need to run:
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`./tools/run_tests/run_tests.py`
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If you want to run tests for any of the languages {c, c++, csharp, node, objc, php, python, ruby}, do this:
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`./tools/run_tests/run_tests.py -l <lang>`
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To know about the list of available commands, do this:
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`./tools/run_tests/run_tests.py -h`
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## Adding or removing source code
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Each language uses its own build system to work. Currently, the root's Makefile
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and the Visual Studio project files are building only the C and C++ source code.
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In order to ease the maintenance of these files, we have a
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template system. Please do not contribute manual changes to any of the generated
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files. Instead, modify the template files, or the build.yaml file, and
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re-generate the project files using the following command:
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`./tools/buildgen/generate_projects.sh`
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You'll find more information about this in the [templates](templates) folder.
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