Functions Framework Conformance

This project contains tooling for conformance and validation of Function Frameworks to the Functions Framework contract.

Quickstart

1. In your Functions Framework repo:

   • Create a set of locally-runnable test functions – one function for each signature type.

   Each function write its inputs to the file function_output.json.

   • The http functions should write the request body.
   • The cloudevent function should serialize the CloudEvent parameter to JSON and write the resulting string.
   • The event (legacy event) function should serialize the data and context parameters to JSON in the format: {"data": ...data..., "context": ...context...} and write the resulting string.

2. Build the test client:

   cd functions-framework-conformance/client && \
     go build

   This will create a client binary in functions-framework-conformance/client directory. You can use this binary to test the conformance of Function Frameworks.

3. Invoke the client binary with the following command to run your function server and the type of the function.

   • Go HTTP function Example:

     $HOME/functions-framework-conformance/client/client \
       -cmd="go run ." \
       -type=http \
       -builder-source=testdata \
       -buildpacks=false

   • .NET CloudEvent function example:

     $HOME/functions-framework-conformance/client/client \
       -cmd="dotnet run MyFunction" \
       -type=cloudevent \
       -buildpacks=false

   • Node.js legacy event function example:

     $HOME/functions-framework-conformance/client/client \
       -cmd="npx @google-cloud/functions-framework --target MyFunction --signature-type=event" \
       -type=legacyevent \
       -buildpacks=false

   If there are validation errors, an error will be logged in the output, causing your conformance test to fail.

Usage

Configuration flag	Type	Default	Description
-cmd	string	"''"	A string with the command to run a Functions Framework server at localhost:8080. Must be wrapped in quotes. Ignored if -buildpacks=true.
-type	string	"http"	Type of function to validate (must be "http", "cloudevent", or "legacyevent").
-validate-mapping	boolean	true	Whether to validate mapping from legacy->cloud events and vice versa (as applicable).
-output-file	string	"function_output.json"	Name of file output by function.
-buildpacks	boolean	true	Whether to use the current release of buildpacks to run the validation. If true, -cmd is ignored and --builder-* flags must be set.
-builder-source	string	""	Function source directory to use in building. Required if -buildpacks=true.
-builder-target	string	""	Function target to use in building. Required if -buildpacks=true.
-builder-runtime	string	""	Runtime to use in building. Required if -buildpacks=true.
-builder-tag	string	"latest"	Builder image tag to use in building.
-start-delay	uint	1	Seconds to wait before sending HTTP request to command process.

If -buildpacks is true, you must specify the following flags:

• -builder-runtime
• -builder-source
• -builder-target