question: how to fetch the remote IP address in WASM

[membphis]

I do not find any doc about how to fetch the remote IP address in WASM.

Many thx for your help.

[alandiegosantos]

It is possible to get the upstream IP address by getting the property upstream.address.
I am working with WASM filters written in Rust, so the code looks like:

use log::error;
use proxy_wasm::traits::*;
use proxy_wasm::types::*;
use std::str;

#[no_mangle]
pub fn _start() {
    proxy_wasm::set_log_level(LogLevel::Info);
    proxy_wasm::set_http_context(|_, _| -> Box<dyn HttpContext> { Box::new(HttpFilter) });
}

struct HttpFilter;

impl Context for HttpFilter{}

impl HttpContext for HttpFilter {
    fn on_http_response_headers(&mut self, _: usize) -> Action {
        // Add a header on the response.
        let prop = self.get_property(["upstream", "address"].to_vec()).unwrap();
        let addr = match str::from_utf8(&prop) {
            Ok(v) => v,
            Err(_e) => "",
        };
        error!("upstream address {}",addr);
        Action::Continue
    }
}

PS: Do not use that as production code. It is only an example.

I would like to create the docs about these properties, if possible.

[membphis]

ok, got it. many thx