Envoy Filter Example

This project demonstrates how to link additional filters into the Envoy binary by creating a new static binary target.

1. Submodule Integration: The main Envoy repository is included as a git submodule.
2. Workspace Mapping: The WORKSPACE file maps the @envoy repository to the local submodule path.
3. Binary Construction: The BUILD file defines a new target (//:envoy) that links the custom filter (e.g., echo2) with the standard Envoy main entry library (@envoy//source/exe:envoy_main_entry_lib).
4. Registration: The custom filter registers itself during the static initialization phase of the Envoy binary, making it available for use in Envoy configurations.

To build a custom Envoy static binary that includes the echo2 filter, ensure you have initialized the submodules first, then use Bazel to build the //:envoy target.

git submodule update --init
bazel build //:envoy

You can run specific integration tests for the echo2 filter or run the standard Envoy test suite from within this project using Bazel.

# Run the echo2 integration test
bazel test //:echo2_integration_test

# Run the regular Envoy tests
bazel test @envoy//test/...