wip(feat): add new AsyncAnonymizedClient using arti-hyper

- feat: add new async client, `AsyncAnonymizedClient`, that uses `arti-hyper`,
  and `arti-client` to connect and do requests over the Tor network.
- feat+test: add all methods and tests for `get_tx_..`, `Transaction`
  related endpoints.

Author: oleonardolima

Cargo.toml

@@ -17,15 +17,24 @@ path = "src/lib.rs"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0" }
 bitcoin = { version = "0.30.0", features = ["serde", "std"], default-features = false }
 # Temporary dependency on internals until the rust-bitcoin devs release the hex-conservative crate.
 bitcoin-internals = { version = "0.1.0", features = ["alloc"] }
 log = "^0.4"
-ureq = { version = "2.5.0", features = ["json"], optional = true }
+ureq = { version = "2.5.0",  optional = true, features = ["json"]}
 reqwest = { version = "0.11", optional = true, default-features = false, features = ["json"] }
+hyper = { version = "0.14", optional = true, features = ["http1", "client", "runtime"], default-features = false }
+arti-client = { version = "0.12.0", optional = true }
+tor-rtcompat = { version = "0.9.6", optional = true, features = ["tokio"]}
+tls-api = { version = "0.9.0", optional = true }
+tls-api-native-tls = { version = "0.9.0", optional = true }
+arti-hyper = { version = "0.12.0", optional = true, features = ["default"] }
+
+[target.'cfg(target_vendor="apple")'.dependencies]
+tls-api-openssl = { version = "0.9.0", optional = true }
 
 [dev-dependencies]
-serde_json = "1.0"
 tokio = { version = "1.20.1", features = ["full"] }
 electrsd = { version = "0.24.0", features = ["legacy", "esplora_a33e97e1", "bitcoind_22_0"] }
 electrum-client = "0.16.0"
@@ -36,10 +45,14 @@ zip = "=0.6.3"
 base64ct = "<1.6.0"
 
 [features]
-default = ["blocking", "async", "async-https"]
+default = ["blocking", "async", "async-https", "async-arti-hyper"]
 blocking = ["ureq", "ureq/socks-proxy"]
 async = ["reqwest", "reqwest/socks"]
 async-https = ["async", "reqwest/default-tls"]
 async-https-native = ["async", "reqwest/native-tls"]
 async-https-rustls = ["async", "reqwest/rustls-tls"]
 async-https-rustls-manual-roots = ["async", "reqwest/rustls-tls-manual-roots"]
+# TODO: (@leonardo) Should I rename it to async-anonymized ?
+async-arti-hyper = ["hyper", "arti-client", "tor-rtcompat", "tls-api", "tls-api-native-tls", "tls-api-openssl", "arti-hyper"]
+async-arti-hyper-native = ["async-arti-hyper", "arti-hyper/native-tls"]
+async-arti-hyper-rustls = ["async-arti-hyper", "arti-hyper/rustls"]

src/async.rs

@@ -9,11 +9,14 @@
 // You may not use this file except in accordance with one or both of these
 // licenses.
 
-//! Esplora by way of `reqwest` HTTP client.
+//! Esplora by way of `reqwest`, and `arti-hyper` HTTP client.
 
 use std::collections::HashMap;
 use std::str::FromStr;
 
+use arti_client::{TorClient, TorClientConfig};
+
+use arti_hyper::ArtiHttpConnector;
 use bitcoin::consensus::{deserialize, serialize};
 use bitcoin::hashes::hex::FromHex;
 use bitcoin::hashes::{sha256, Hash};
@@ -22,10 +25,17 @@ use bitcoin::{
 };
 use bitcoin_internals::hex::display::DisplayHex;
 
+use hyper::{Body, Uri};
 #[allow(unused_imports)]
 use log::{debug, error, info, trace};
 
 use reqwest::{Client, StatusCode};
+use tls_api::{TlsConnector as TlsConnectorTrait, TlsConnectorBuilder};
+#[cfg(not(target_vendor = "apple"))]
+use tls_api_native_tls::TlsConnector;
+#[cfg(target_vendor = "apple")]
+use tls_api_openssl::TlsConnector;
+use tor_rtcompat::PreferredRuntime;
 
 use crate::{BlockStatus, BlockSummary, Builder, Error, MerkleProof, OutputStatus, Tx, TxStatus};
 
@@ -429,3 +439,149 @@ impl AsyncClient {
         &self.client
     }
 }
+
+#[derive(Debug, Clone)]
+pub struct AsyncAnonymizedClient {
+    url: String,
+    client: hyper::Client<ArtiHttpConnector<PreferredRuntime, TlsConnector>>,
+}
+
+impl AsyncAnonymizedClient {
+    /// build an async [`TorClient`] with default Tor configuration
+    async fn create_tor_client() -> Result<TorClient<PreferredRuntime>, arti_client::Error> {
+        let config = TorClientConfig::default();
+        TorClient::create_bootstrapped(config).await
+    }
+
+    /// build an [`AsyncAnonymizedClient`] from a [`Builder`]
+    pub async fn from_builder(builder: Builder) -> Result<Self, Error> {
+        let tor_client = Self::create_tor_client().await?.isolated_client();
+
+        let tls_conn: TlsConnector = TlsConnector::builder()
+            .map_err(|_| Error::TlsConnector)?
+            .build()
+            .map_err(|_| Error::TlsConnector)?;
+
+        let connector = ArtiHttpConnector::new(tor_client, tls_conn);
+
+        // TODO: (@leonardo) how to handle/pass the timeout option ?
+        let client = hyper::Client::builder().build::<_, Body>(connector);
+        Ok(Self::from_client(builder.base_url, client))
+    }
+
+    /// build an async client from the base url and [`Client`]
+    pub fn from_client(
+        url: String,
+        client: hyper::Client<ArtiHttpConnector<PreferredRuntime, TlsConnector>>,
+    ) -> Self {
+        AsyncAnonymizedClient { url, client }
+    }
+
+    /// Get a [`Option<Transaction>`] given its [`Txid`]
+    pub async fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> {
+        let path = format!("{}/tx/{}/raw", self.url, txid);
+        let uri = Uri::from_str(&path).map_err(|_| Error::InvalidUri)?;
+
+        let resp = self.client.get(uri).await?;
+
+        if let StatusCode::NOT_FOUND = resp.status() {
+            return Ok(None);
+        }
+
+        if resp.status().is_server_error() || resp.status().is_client_error() {
+            Err(Error::HttpResponse {
+                status: resp.status().as_u16(),
+                message: {
+                    let body = resp.into_body();
+                    let bytes = hyper::body::to_bytes(body).await?;
+                    std::str::from_utf8(&bytes)
+                        .map_err(|_| Error::ResponseDecoding)?
+                        .to_string()
+                },
+            })
+        } else {
+            let body = resp.into_body();
+            let bytes = hyper::body::to_bytes(body).await?;
+            Ok(Some(deserialize(&bytes)?))
+        }
+    }
+
+    /// Get a [`Transaction`] given its [`Txid`].
+    pub async fn get_tx_no_opt(&self, txid: &Txid) -> Result<Transaction, Error> {
+        match self.get_tx(txid).await {
+            Ok(Some(tx)) => Ok(tx),
+            Ok(None) => Err(Error::TransactionNotFound(*txid)),
+            Err(e) => Err(e),
+        }
+    }
+
+    /// Get a [`Txid`] of a transaction given its index in a block with a given hash.
+    pub async fn get_txid_at_block_index(
+        &self,
+        block_hash: &BlockHash,
+        index: usize,
+    ) -> Result<Option<Txid>, Error> {
+        let path = format!("{}/block/{}/txid/{}", self.url, block_hash, index);
+        let uri = Uri::from_str(&path).map_err(|_| Error::InvalidUri)?;
+
+        let resp = self.client.get(uri).await?;
+
+        if let StatusCode::NOT_FOUND = resp.status() {
+            return Ok(None);
+        }
+
+        if resp.status().is_server_error() || resp.status().is_client_error() {
+            Err(Error::HttpResponse {
+                status: resp.status().as_u16(),
+                message: {
+                    let body = resp.into_body();
+                    let bytes = hyper::body::to_bytes(body).await?;
+                    std::str::from_utf8(&bytes)
+                        .map_err(|_| Error::ResponseDecoding)?
+                        .to_string()
+                },
+            })
+        } else {
+            let body = resp.into_body();
+            let bytes = hyper::body::to_bytes(body).await?;
+            Ok(Some(deserialize(&bytes)?))
+        }
+    }
+
+    /// Get the status of a [`Transaction`] given its [`Txid`].
+    pub async fn get_tx_status(&self, txid: &Txid) -> Result<TxStatus, Error> {
+        let path = format!("{}/tx/{}/status", self.url, txid);
+        let uri = Uri::from_str(&path).map_err(|_| Error::InvalidUri)?;
+
+        let resp = self.client.get(uri).await?;
+
+        if resp.status().is_server_error() || resp.status().is_client_error() {
+            Err(Error::HttpResponse {
+                status: resp.status().as_u16(),
+                message: {
+                    let body = resp.into_body();
+                    let bytes = hyper::body::to_bytes(body).await?;
+                    std::str::from_utf8(&bytes)
+                        .map_err(|_| Error::ResponseDecoding)?
+                        .to_string()
+                },
+            })
+        } else {
+            let body = resp.into_body();
+            let bytes = hyper::body::to_bytes(body).await?;
+            let tx_status =
+                serde_json::from_slice::<TxStatus>(&bytes).map_err(|_| Error::ResponseDecoding)?;
+            Ok(tx_status)
+        }
+    }
+
+    /// Get the underlying base URL.
+    pub fn url(&self) -> &str {
+        &self.url
+    }
+
+    /// Get the underlying [`hyper::Client`].
+    pub fn client(&self) -> &hyper::Client<ArtiHttpConnector<PreferredRuntime, TlsConnector>> {
+        &self.client
+    }
+}