A collection of WebAssemby filters for Envoy proxy written in C,C++,C# and Rust for exercising different features provided by envoy-wasm.

See the Image Hub as a related project (a sample application). Also, see Meshery's filter management capabitilies.

See all community meeting details --> https://meet.layer5.io

• Topic: WebAssembly Filters Meeting
• Day: Weekly on Mondays
• Time: 7:30pm IST / 3:00pm UK / 9:00am Central
• WASM Filters call: https://meet.layer5.io/wasm
• Meeting Minutes: https://bit.ly/3zGZgGg

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✔️ Join community meetings. See details on the Layer5 community calendar.
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Not sure where to start? Grab an open issue with the help-wanted label.

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To compile Rust filters to WASM, the nightly toolchain and support for wasm compilation target is needed. Make sure you have Rust and Cargo installed using Rustup. If you're on a *nix system (Unix, Linux, MacOS), in the project root directory, run:

make rust-toolchain

This will also install wasm-pack for you. Also, take a look at installing wasm-pack for OS other than *nix.

Upstream is a webserver which is used by few of the filters mentioned above. It provides a route for :

• Mock authentication
• Storing Metrics
• Retrieving Metrics

Build the docker Image for Upstream before proceeding with the examples.

Build Image:

cd upstream
make

Simulates handling authentication of requests at proxy level. Requests with a header token with value hello are accepted as authorized while the rest unauthorized. The actual authentication is handled by the Upstream server. Whenever the proxy recieves a request it extracts the token header and makes a request to the Upstream server which validates the token and returns a response.

Build and deploy:

cd http-auth
make run-filtered

Test:

curl  -H "token":"hello" 0.0.0.0:18000 -v # Authorized
curl  -H "token":"world" 0.0.0.0:18000 -v # Unauthorized

Collects simple metrics for every TCP packet and logs it.

Build and deploy:

cd tcp-metrics
make run-filtered

Test:

curl 0.0.0.0:18000 -v -d "request body"

Check the logs for the metrics.

Parses the contents of every TCP packet the proxy receives and logs it.

Build and deploy:

cd tcp-packet-parse
make run-filtered

Test:

curl 0.0.0.0:18000 -v -d "request body"

Check the logs for the packet contents.

An example which depicts an singleton HTTP WASM service which does an HTTP call once every 2 seconds.

Build and deploy:

cd singleton-http-call
make run-filtered

Check the logs for the response of the request.

This example showcases communication between a WASM filter and a service via shared queue. It combines the Singleton-HTTP-Call and TCP-Metrics examples. The filter collects metrics and enqueues it onto the queue while the service dequeues it and sends it to upstream server where it is stored.

Build and deploy:

cd metrics-store
make run-filtered

Test:

curl 0.0.0.0:18000 -v -d "request body" # make a few of these calls
curl 0.0.0.0:8080/retrieve -v # Retrieves the stored stats
# x | y | z  === x : downstream bytes, y : upstream bytes, z: the latency for application server to respond