use crate::{BlockData, BlockHeaderData, BlockSource, AsyncBlockSourceResult};
use crate::http::{BinaryResponse, HttpEndpoint, HttpClient, JsonResponse};
use crate::gossip::UtxoSource;
use crate::convert::GetUtxosResponse;
use bitcoin::OutPoint;
use bitcoin::hash_types::BlockHash;
use std::convert::TryFrom;
use std::convert::TryInto;
use std::sync::Mutex;
pub struct RestClient {
endpoint: HttpEndpoint,
client: Mutex<Option<HttpClient>>,
}
impl RestClient {
pub fn new(endpoint: HttpEndpoint) -> std::io::Result<Self> {
Ok(Self { endpoint, client: Mutex::new(None) })
}
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);
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_string());
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_string());
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?)
})
}
}
impl UtxoSource for RestClient {
fn get_block_hash_by_height<'a>(&'a self, block_height: u32) -> AsyncBlockSourceResult<'a, BlockHash> {
Box::pin(async move {
let resource_path = format!("blockhashbyheight/{}.bin", block_height);
Ok(self.request_resource::<BinaryResponse, _>(&resource_path).await?)
})
}
fn is_output_unspent<'a>(&'a self, outpoint: OutPoint) -> AsyncBlockSourceResult<'a, bool> {
Box::pin(async move {
let resource_path = format!("getutxos/{}-{}.json", outpoint.txid.to_string(), outpoint.vout);
let utxo_result =
self.request_resource::<JsonResponse, GetUtxosResponse>(&resource_path).await?;
Ok(utxo_result.hit_bitmap_nonempty)
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::http::BinaryResponse;
use crate::http::client_tests::{HttpServer, MessageBody};
use bitcoin::hashes::Hash;
impl TryInto<u32> for BinaryResponse {
type Error = std::io::Error;
fn try_into(self) -> std::io::Result<u32> {
match std::str::from_utf8(&self.0) {
Err(e) => Err(std::io::Error::new(std::io::ErrorKind::InvalidData, e)),
Ok(s) => match u32::from_str_radix(s, 10) {
Err(e) => Err(std::io::Error::new(std::io::ErrorKind::InvalidData, e)),
Ok(n) => Ok(n),
}
}
}
}
#[tokio::test]
async fn request_unknown_resource() {
let server = HttpServer::responding_with_not_found();
let client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
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 client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
Err(e) => assert_eq!(e.kind(), std::io::ErrorKind::InvalidData),
Ok(_) => panic!("Expected error"),
}
}
#[tokio::test]
async fn request_valid_resource() {
let server = HttpServer::responding_with_ok(MessageBody::Content(42));
let client = RestClient::new(server.endpoint()).unwrap();
match client.request_resource::<BinaryResponse, u32>("/").await {
Err(e) => panic!("Unexpected error: {:?}", e),
Ok(n) => assert_eq!(n, 42),
}
}
#[tokio::test]
async fn parses_negative_getutxos() {
let server = HttpServer::responding_with_ok(MessageBody::Content(
"{\"chainHeight\": 1, \"bitmap\":\"0\",\"utxos\":[]}"
));
let client = RestClient::new(server.endpoint()).unwrap();
let outpoint = OutPoint::new(bitcoin::Txid::from_byte_array([0; 32]), 0);
let unspent_output = client.is_output_unspent(outpoint).await.unwrap();
assert_eq!(unspent_output, false);
}
#[tokio::test]
async fn parses_positive_getutxos() {
let server = HttpServer::responding_with_ok(MessageBody::Content(
"{\"chainHeight\": 1, \"bitmap\":\"1\",\"utxos\":[]}"
));
let client = RestClient::new(server.endpoint()).unwrap();
let outpoint = OutPoint::new(bitcoin::Txid::from_byte_array([0; 32]), 0);
let unspent_output = client.is_output_unspent(outpoint).await.unwrap();
assert_eq!(unspent_output, true);
}
}