Crate envoy_sdk

Rust SDK for WebAssembly-based Envoy extensions.

TLDR

/// My very own `HttpFilter`.
struct MyHttpFilter;

impl HttpFilter for MyHttpFilter {
    fn on_request_headers(&mut self, _num_headers: usize, _end_of_stream: bool, _ops: &dyn RequestHeadersOps) -> Result<FilterHeadersStatus> {
        log::info!("proxying an HTTP request");
        Ok(FilterHeadersStatus::Continue)
    }
}

Supported Extension Types

Envoy SDK can help you to develop the following types of extensions:

• HttpFilter
• NetworkFilter
• AccessLogger

Supported Envoy APIs

You can use the following Envoy APIs in your extensions:

• Clock
• HttpClient
• Log
• Stats
• StreamInfo
• SharedData
• SharedQueue

Example extensions

• Sample HTTP Filter
• Sample Network Filter
• Sample Access Logger

How To

• How To make my extension configurable?
• How To share stats between filter instances?
• How To use HttpClient?

Modules

error	The Error type and helpers.
extension	Envoy Extension APIs to be implemented by extensions.
host	Envoy Host APIs provided for use by extensions.

Macros

entrypoint

Generates the _start function that will be called by Envoy to let WebAssembly module initialize itself.