Macro init 

macro_rules! init {
    ($new_filter_fn:expr) => { ... };
}

Define the init function for the module. This macro should be used in the root of the module.

Arguments

• $new_filter_fn - The function that creates a new HttpFilter object: fn(&str) -> Box<dyn HttpFilter>. This function is called for each new filter chain configuration and should return a new HttpFilter object based on the configuration string.

Example

use envoy_dynamic_modules_rust_sdk::*;

struct HelloWorldFilter {}
struct HelloWorldFilterInstance {}

impl HttpFilter for HelloWorldFilter {
   fn new_instance(&mut self, _envoy_filter_instance: EnvoyFilterInstance) -> Box<dyn HttpFilterInstance> {
      Box::new(HelloWorldFilterInstance {})
  }
}

impl HttpFilterInstance for HelloWorldFilterInstance {}

fn new_http_filter(config: &str) -> Box<dyn HttpFilter> {
   match config {
      "helloworld" => Box::new(HelloWorldFilter {}),
     _ => panic!("Unknown config: {}", config),
   }
}
init!(new_http_filter);