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Implement a simple DHT fallback on HTTPS
Configured in the config file.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| use std::io; | ||
|
|
||
| use http::Uri; | ||
| use http_body_util::{BodyExt, Empty}; | ||
| use hyper::body::Bytes; | ||
| use hyper_rustls::{ConfigBuilderExt, HttpsConnector}; | ||
| use hyper_util::{ | ||
| client::legacy::{connect::HttpConnector, Client}, | ||
| rt::TokioExecutor, | ||
| }; | ||
| use log::error; | ||
| use nimiq_keys::Address; | ||
| use nimiq_network_libp2p::PeerId; | ||
| use serde::Deserialize; | ||
| use url::Url; | ||
|
|
||
| #[derive(Deserialize)] | ||
| struct Fallback { | ||
| validators: Vec<FallbackValidator>, | ||
| } | ||
|
|
||
| #[derive(Deserialize)] | ||
| struct FallbackValidator { | ||
| address: Address, | ||
| peer_id: String, | ||
| } | ||
|
|
||
| pub struct DhtFallback { | ||
| client: Client<HttpsConnector<HttpConnector>, Empty<Bytes>>, | ||
| uri: Uri, | ||
| } | ||
|
|
||
| impl DhtFallback { | ||
| fn new_inner(url: Url) -> io::Result<DhtFallback> { | ||
| let tls = rustls::ClientConfig::builder() | ||
| .with_native_roots()? | ||
| .with_no_client_auth(); | ||
|
|
||
| let https = hyper_rustls::HttpsConnectorBuilder::new() | ||
| .with_tls_config(tls) | ||
| .https_or_http() | ||
| .enable_http1() | ||
| .build(); | ||
|
|
||
| let client = Client::builder(TokioExecutor::new()).build(https); | ||
| let uri = url.as_str().parse().map_err(|_| { | ||
| io::Error::new(io::ErrorKind::InvalidInput, format!("invalid URI: {}", url)) | ||
| })?; | ||
| Ok(DhtFallback { client, uri }) | ||
| } | ||
| pub fn new(url: Url) -> Option<DhtFallback> { | ||
| DhtFallback::new_inner(url) | ||
| .inspect_err(|error| error!(%error, "couldn't create http client")) | ||
| .ok() | ||
| } | ||
|
|
||
| async fn resolve_inner(&self, validator_address: Address) -> Result<Option<PeerId>, String> { | ||
| let response = self | ||
| .client | ||
| .get(self.uri.clone()) | ||
| .await | ||
| .map_err(|error| error.to_string())?; | ||
|
|
||
| if !response.status().is_success() { | ||
| return Err(format!("bad http response: {}", response.status())); | ||
| } | ||
|
|
||
| let response = response | ||
| .into_body() | ||
| .collect() | ||
| .await | ||
| .map_err(|error| error.to_string())? | ||
| .to_bytes(); | ||
|
|
||
| let fallback: Fallback = | ||
| serde_json::from_slice(&response).map_err(|error| format!("invalid JSON: {error}"))?; | ||
|
|
||
| for validator in fallback.validators { | ||
| if validator.address == validator_address { | ||
| return Ok(Some(validator.peer_id.parse().map_err(|_| { | ||
| format!("invalid peer ID: {:?}", validator.peer_id) | ||
| })?)); | ||
| } | ||
| } | ||
|
|
||
| Ok(None) | ||
| } | ||
| pub async fn resolve(&self, validator_address: Address) -> Option<PeerId> { | ||
| self.resolve_inner(validator_address.clone()) | ||
| .await | ||
| .inspect_err(|error| error!(%error, %validator_address, "couldn't resolve")) | ||
| .ok() | ||
| .flatten() | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| use url::Url; | ||
|
|
||
| use super::DhtFallback; | ||
|
|
||
| #[tokio::test] | ||
| async fn resolve() { | ||
| assert_eq!( | ||
| DhtFallback::new(Url::parse("https://gist.githubusercontent.com/hrxi/50dc18caa17826e72cc05542cfe8946f/raw/dht.json").unwrap()) | ||
| .unwrap() | ||
| .resolve( | ||
| "NQ36 U0BH 0BHM J0EH UAE5 FMV6 D2EY 8TBP 50M3" | ||
| .parse() | ||
| .unwrap() | ||
| ) | ||
| .await, | ||
| Some( | ||
| "12D3KooW9tKu6QesTCCqADjhVSf4hvWinzjuLpxv4mefBzKLkiae".parse().unwrap()) | ||
| ); | ||
| } | ||
| } |
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