Specifying dependencies in Ruby
Cloud Functions written in Ruby use bundler to access dependencies. Dependencies can be downloaded when your function is deployed, or packaged locally alongside your function.
Each function must provide a
Gemfile that specifies the
gem, along with any additional gems needed by the function.
Gemfile must be in
the same directory as the
app.rb file that contains your function code. In
addition, your function must provide a lockfile that specifies all the
transitive dependencies and their exact versions. This file,
also located in the same directory alongside the
When you deploy your function, Cloud Functions downloads and installs
the dependencies declared in the
Gemfile lists the packages required by your function, along with any
optional version constraints. For more details, see the
The following is an example
source "https://rubygems.org" gem "functions_framework", "~> 0.7" gem "google-cloud-storage", "~> 1.29"
You run the following command to install the
functions_framework gem and other
Gemfile.lock is generated by bundler when it analyzes your dependencies,
and freezes the exact versions of each gem to be installed. This ensures, for
example, that your function is deployed with the same dependency versions as
those used in your local tests. The exact format of the
private to bundler and is not meant to be edited by hand.
If you have already used bundler to install your dependencies and run tests
locally, you probably already have a
Gemfile.lock file present. If not, you
can generate one by running:
Packaging local dependencies
You can also package and deploy dependencies alongside alongside your function. This approach is useful if your dependency is not available via the rubygems package manager.
To package a gem locally, include it in a directory in your function's directory
structure, and provide the path in the dependency's
Gemfile entry. The gem
directory must include a valid
gemspec file, and it must be located within the
function's directory hierarchy so that its code is deployed along with your
function. For example, you might use a directory structure such as the
myfunction/ ├── Gemfile ├── Gemfile.lock ├── app.rb └── my_private_gem/ ├── lib/ | └── my_private_gem.rb └── my_private_gem.gemspec
Gemfile entry might look like this:
source "https://rubygems.org" gem "functions_framework", "~> 0.7" gem "my_private_gem", path: "./my_private_gem"
See the Gemfile reference for more discussion about referencing local gem paths.