grpc/tools/interop_matrix/README.md

Overview

This directory contains scripts that facilitate building and running gRPC tests for combinations of language/runtimes (known as matrix).

The setup builds gRPC docker images for each language/runtime and upload it to Google Container Registry (GCR). These images, encapsulating gRPC stack from specific releases/tag, are used to test version compatiblity between gRPC release versions.

Step-by-step instructions for adding a GCR image for a new release for compatibility test

We have continuous nightly test setup to test gRPC backward compatibility between old clients and latest server. When a gRPC developer creates a new gRPC release, s/he is also responsible to add the just-released gRPC client to the nightly test. The steps are:

• Add (or update) an entry in ./client_matrix.py file to reference the github tag for the release.
• Build new client docker image(s). For example, for C and wrapper languages release v1.9.9, do
  • tools/interop_matrix/create_matrix_images.py --git_checkout --release=v1.9.9 --language cxx csharp python ruby php
• Verify that the new docker image was built successfully and uploaded to GCR. For example,
  • gcloud beta container images list --repository gcr.io/grpc-testing shows image repos.
  • gcloud beta container images list-tags gcr.io/grpc-testing/grpc_interop_java_oracle8 should show an image entry with tag v1.9.9.
• Verify the just-created docker client image would pass backward compatibility test (it should). For example,
  • gcloud docker -- pull gcr.io/grpc-testing/grpc_interop_java_oracle8:v1.9.9 followed by
  • docker_image=gcr.io/grpc-testing/grpc_interop_java_oracle8:v1.9.9 tools/interop_matrix/testcases/java__master
• git commit the change and merge it to upstream/master.
• (Optional) clean up the tmp directory to where grpc source is cloned at /export/hda3/tmp/grpc_matrix/. For more details on each step, refer to sections below.

Instructions for adding new language/runtimes*

• Create new Dockerfile.template, build_interop.sh.template for the language/runtime under template/tools/dockerfile/.
• Run tools/buildgen/generate_projects.sh to create corresponding files under tools/dockerfile/.
• Add language/runtimes to client_matrix.py following existing language/runtimes examples.
• Run tools/interop_matrix/create_matrix_images.py which will build and upload images to GCR. Unless you are also building images for a gRPC release, make sure not to set --release (the default release 'master' is used for testing).

*: Please delete your docker images at https://pantheon.corp.google.com/gcr/images/grpc-testing?project=grpc-testing afterwards. Permissions to access GrpcTesting project is required for this step.

Instructions for creating new test cases

• Create test cases by running LANG=<lang> [RELEASE=<release>] ./create_testcases.sh. For example,
  • LANG=go ./create_testcases.sh will generate ./testcases/go__master, which is also a functional bash script.
  • LANG=go KEEP_IMAGE=1 ./create_testcases.sh will generate ./testcases/go__master and keep the local docker image so it can be invoked simply via ./testcases/go__master. Note: remove local docker images manually afterwards with docker rmi <image_id>.
• Stage and commit the generated test case file ./testcases/<lang>__<release>.

Instructions for running test cases against GCR images

• Run tools/interop_matrix/run_interop_matrix_tests.py. Useful options:
  • --release specifies a git release tag. Defaults to --release=all. Make sure the GCR images with the tag have been created using create_matrix_images.py above.
  • --language specifies a language. Defaults to --language=all. For example, To test all languages for all gRPC releases across all runtimes, do tools/interop_matrix/run_interop_matrix_test.py --release=all.
• The output for all the test cases is recorded in a junit style xml file (default to 'report.xml').

Instructions for running test cases against a GCR image manually

• Download docker image from GCR. For example: gcloud docker -- pull gcr.io/grpc-testing/grpc_interop_go1.7:master.
• Run test cases by specifying docker_image variable inline with the test case script created above. For example:
  • docker_image=gcr.io/grpc-testing/grpc_interop_go1.7:master ./testcases/go__master will run go__master test cases against go1.7 with gRPC release master docker image in GCR.

Note:

• File path starting with tools/ or template/ are relative to the grpc repo root dir. File path starting with ./ are relative to current directory (tools/interop_matrix).
• Creating and referencing images in GCR require read and write permission to Google Container Registry path gcr.io/grpc-testing.