Skip to content

Latest commit

 

History

History
77 lines (59 loc) · 1.81 KB

README.md

File metadata and controls

77 lines (59 loc) · 1.81 KB
Raw

CI workflow

Envoy Response Body Injection filter

Envoy filter written in Rust to provide Reponse Body Injection (RBI). This requires Envoy's WASM filters

Build

rustup target add wasm32-wasi
cargo build --target wasm32-wasi

Release build

rustup target add wasm32-wasi
cargo build --target wasm32-wasi --release

Usage

Add the WASM filter configuration to http_filters as part of Envoy's HTTP Connection Management configuration.

- name: envoy.filters.http.wasm
  typed_config:
    "@type": type.googleapis.com/udpa.type.v1.TypedStruct
    type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
    value:
      config:
        name: "rbi_filter"
        root_id: "rbi_filter_id"
        configuration:
          "@type": "type.googleapis.com/google.protobuf.StringValue"
          value: |
            {
              "hello": "<h1>Hello WASM</h1>"
            }
        vm_config:
          runtime: "envoy.wasm.runtime.v8"
          vm_id: "rbi_injection_vm_id"
          code:
            local:
              filename: "/etc/envoy/envoy_rbi_filter.wasm"
          configuration: {}

Example

To run the example local:

cargo build --target wasm32-wasi
docker compose up --build --file ./example/docker-compose.yaml

Send the local running cluster traffic:

curl -vvv http://localhost:10000/

# *   Trying ::1...
# * TCP_NODELAY set
# ...
# * Connection #0 to host localhost left intact
# <html><body><h1>Hello WASM</h1></body></html>
# * Closing connection 0

Tests

End to end integration tests require the example to run local.

cargo test