-use crate::http::{HttpEndpoint, HttpClient};
+//! Simple REST client implementation which implements [`BlockSource`] against a Bitcoin Core REST
+//! endpoint.
+
+use crate::{BlockData, BlockHeaderData, BlockSource, AsyncBlockSourceResult};
+use crate::http::{BinaryResponse, HttpEndpoint, HttpClient, JsonResponse};
+
+use bitcoin::hash_types::BlockHash;
+use bitcoin::hashes::hex::ToHex;
use std::convert::TryFrom;
use std::convert::TryInto;
+use std::sync::Mutex;
/// A simple REST client for requesting resources using HTTP `GET`.
pub struct RestClient {
endpoint: HttpEndpoint,
- client: HttpClient,
+ client: Mutex<Option<HttpClient>>,
}
impl RestClient {
/// Creates a new REST client connected to the given endpoint.
+ ///
+ /// The endpoint should contain the REST path component (e.g., http://127.0.0.1:8332/rest).
pub fn new(endpoint: HttpEndpoint) -> std::io::Result<Self> {
- let client = HttpClient::connect(&endpoint)?;
- Ok(Self { endpoint, client })
+ Ok(Self { endpoint, client: Mutex::new(None) })
}
/// Requests a resource encoded in `F` format and interpreted as type `T`.
- async fn request_resource<F, T>(&mut self, resource_path: &str) -> std::io::Result<T>
+ pub async fn request_resource<F, T>(&self, resource_path: &str) -> std::io::Result<T>
where F: TryFrom<Vec<u8>, Error = std::io::Error> + TryInto<T, Error = std::io::Error> {
let host = format!("{}:{}", self.endpoint.host(), self.endpoint.port());
let uri = format!("{}/{}", self.endpoint.path().trim_end_matches("/"), resource_path);
- self.client.get::<F>(&uri, &host).await?.try_into()
+ let mut client = if let Some(client) = self.client.lock().unwrap().take() { client }
+ else { HttpClient::connect(&self.endpoint)? };
+ let res = client.get::<F>(&uri, &host).await?.try_into();
+ *self.client.lock().unwrap() = Some(client);
+ res
+ }
+}
+
+impl BlockSource for RestClient {
+ fn get_header<'a>(&'a self, header_hash: &'a BlockHash, _height: Option<u32>) -> AsyncBlockSourceResult<'a, BlockHeaderData> {
+ Box::pin(async move {
+ let resource_path = format!("headers/1/{}.json", header_hash.to_hex());
+ Ok(self.request_resource::<JsonResponse, _>(&resource_path).await?)
+ })
+ }
+
+ fn get_block<'a>(&'a self, header_hash: &'a BlockHash) -> AsyncBlockSourceResult<'a, BlockData> {
+ Box::pin(async move {
+ let resource_path = format!("block/{}.bin", header_hash.to_hex());
+ Ok(BlockData::FullBlock(self.request_resource::<BinaryResponse, _>(&resource_path).await?))
+ })
+ }
+
+ fn get_best_block<'a>(&'a self) -> AsyncBlockSourceResult<'a, (BlockHash, Option<u32>)> {
+ Box::pin(async move {
+ Ok(self.request_resource::<JsonResponse, _>("chaininfo.json").await?)
+ })
}
}
#[tokio::test]
async fn request_unknown_resource() {
let server = HttpServer::responding_with_not_found();
- let mut client = RestClient::new(server.endpoint()).unwrap();
+ let client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
- Err(e) => assert_eq!(e.kind(), std::io::ErrorKind::NotFound),
+ Err(e) => assert_eq!(e.kind(), std::io::ErrorKind::Other),
Ok(_) => panic!("Expected error"),
}
}
#[tokio::test]
async fn request_malformed_resource() {
let server = HttpServer::responding_with_ok(MessageBody::Content("foo"));
- let mut client = RestClient::new(server.endpoint()).unwrap();
+ let client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
Err(e) => assert_eq!(e.kind(), std::io::ErrorKind::InvalidData),
#[tokio::test]
async fn request_valid_resource() {
let server = HttpServer::responding_with_ok(MessageBody::Content(42));
- let mut client = RestClient::new(server.endpoint()).unwrap();
+ let client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
Err(e) => panic!("Unexpected error: {:?}", e),