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nym/documentation/docs/pages/developers/rust/mixnet/examples/builders/builder.mdx
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mfahampshire a0057eb223 add notice re sdks (#5792)
* add notice re sdks

* fix borked notice

* fix another borked notice
2025-05-22 10:25:25 +00:00

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# Mixnet Client Builder
import { Callout } from 'nextra/components';
<Callout type="warning">
There will be a breaking SDK upgrade in the coming months. This upgrade will make the SDK a lot easier to build with.
This upgrade will affect the interface of the SDK dramatically, and will be coupled with a protocol change - stay tuned for information on early access to the new protocol testnet.
It will also be coupled with the documentation of the SDK on [crates.io](https://crates.io/).
</Callout>
You can spin up an ephemeral client like so. This client will not have a persistent identity and its keys will be dropped on restart. Since there is currently no way of reconnecting a client that has been disconnected after use, then treat disconnecting a client the same as dropping its keys entirely.
> You can find this code [here](https://github.com/nymtech/nym/blob/master/sdk/rust/nym-sdk/examples/builder.rs).
```rust
use nym_sdk::mixnet;
use nym_sdk::mixnet::MixnetMessageSender;
#[tokio::main]
async fn main() {
nym_bin_common::logging::setup_logging();
// Create client builder, including ephemeral keys. The builder can be usable in the context
// where you don't want to connect just yet.
let client = mixnet::MixnetClientBuilder::new_ephemeral()
.build()
.unwrap();
// Now we connect to the mixnet, using ephemeral keys already created
let mut client = client.connect_to_mixnet().await.unwrap();
// Be able to get our client address
let our_address = client.nym_address();
println!("Our client nym address is: {our_address}");
// Send a message through the mixnet to ourselves
client
.send_plain_message(*our_address, "hello there")
.await
.unwrap();
println!("Waiting for message");
if let Some(received) = client.wait_for_messages().await {
for r in received {
println!("Received: {}", String::from_utf8_lossy(&r.message));
}
}
client.disconnect().await;
}
```