Skip to content

Latest commit

 

History

History
126 lines (93 loc) · 5.07 KB

README.md

File metadata and controls

126 lines (93 loc) · 5.07 KB
Raw

HOWTO: using google-cloud-cpp-spanner in your project

This directory contains small examples showing how to use the Cloud Spanner C++ client library in your own project. These instructions assume that you have some experience as a C++ developer and that you have a working C++ toolchain (compiler, linker, etc.) installed on your platform.

Configuring authentication for the C++ Client Library

Like most Google Cloud Platform (GCP) services, Cloud Spanner requires that your application authenticates with the service before accessing any data. If you are not familiar with GCP authentication please take this opportunity to review the Authentication Overview. This library uses the GOOGLE_APPLICATION_CREDENTIALS environment variable to find the credentials file. For example:

Shell Command
Bash/zsh/ksh/etc. export GOOGLE_APPLICATION_CREDENTIALS=[PATH]
sh GOOGLE_APPLICATION_CREDENTIALS=[PATH]; export GOOGLE_APPLICATION_CREDENTIALS
csh/tsch setenv GOOGLE_APPLICATION_CREDENTIALS [PATH]
Windows Powershell $env:GOOGLE_APPLICATION_CREDENTIALS=[PATH]
Windows cmd.exe set GOOGLE_APPLICATION_CREDENTIALS=[PATH]

Setting this environment variable is the recommended way to configure the authentication preferences, though if the environment variable is not set, the library searches for a credentials file in the same location as the Cloud SDK. For more information about Application Default Credentials, see https://cloud.google.com/docs/authentication/production

Using with Bazel

  1. Install Bazel using the instructions from the bazel.build website.

  2. Compile this example using Bazel:

    cd $HOME/google-cloud-cpp-spanner/quickstart
bazel build ...

  3. Run the example, change the place holder to appropriate values:

    bazel run :quickstart -- [GCP PROJECT] [CLOUD SPANNER INSTANCE] [CLOUD SPANNER DATABASE]

If you are using Windows or macOS there are additional instructions at the end of this document.

Using with CMake

  1. Install CMake. The package managers for most Linux distributions include a package for CMake. Likewise, you can install CMake on Windows using a package manager such as chocolatey, and on macOS using homebrew. You can also obtain the software directly from the [cmake.org][https://cmake.org/download/].

  2. Install the dependencies with your favorite tools. As an example, if you use vcpkg:

    cd $HOME/vcpkg
./vcpkg install google-cloud-cpp-spanner

  3. Configure CMake, if necessary, configure the directory where you installed the dependencies:

    cd $HOME/gooogle-cloud-cpp-spanner/quickstart
cmake -H. -B.build -DCMAKE_TOOLCHAIN_FILE=$HOME/vcpkg/scripts/buildsystems/vcpkg.cmake
cmake --build .build

  4. Run the example, change the place holder to appropriate values:

    .build/quickstart [GCP PROJECT] [CLOUD SPANNER INSTANCE] [CLOUD SPANNER DATABASE]

If you are using Windows or macOS there are additional instructions at the end of this document.

Platform Specific Notes

macOS

gRPC requires an environment variable to configure the trust store for SSL certificates, you can download and configure this using:

curl -Lo roots.pem https://raw.githubusercontent.com/grpc/grpc/master/etc/roots.pem
export GRPC_DEFAULT_SSL_ROOTS_FILE_PATH="$PWD/roots.pem"

To workaround a bug in Bazel, gRPC requires this flag on macOS builds, you can add the option manually or include it in your .bazelrc file:

bazel build --copt=-DGRPC_BAZEL_BUILD ...

Windows

To correctly configure the MSVC runtime you should change the CMake minimum required version to 3.15 or add -DCMAKE_POLICY_DEFAULT_CMP0091=NEW to the CMake configuration step.

gRPC requires an environment variable to configure the trust store for SSL certificates, you can download and configure this using:

@powershell -NoProfile -ExecutionPolicy unrestricted -Command ^
    (new-object System.Net.WebClient).Downloadfile( ^
        'https://raw.githubusercontent.com/grpc/grpc/master/etc/roots.pem', ^
        'roots.pem')
set GRPC_DEFAULT_SSL_ROOTS_FILE_PATH=%cd%\roots.pem