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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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-toolchainThis 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
makeSimulates 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-filteredTest:
curl -H "token":"hello" 0.0.0.0:18000 -v # Authorized
curl -H "token":"world" 0.0.0.0:18000 -v # UnauthorizedCollects simple metrics for every TCP packet and logs it.
Build and deploy:
cd tcp-metrics
make run-filteredTest:
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-filteredTest:
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-filteredCheck 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-filteredTest:
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 
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