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| 1 | +// Bitcoin Dev Kit |
| 2 | +// Written in 2020 by Alekos Filini <[email protected]> |
| 3 | +// |
| 4 | +// Copyright (c) 2020-2021 Bitcoin Dev Kit Developers |
| 5 | +// |
| 6 | +// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE |
| 7 | +// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| 8 | +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option. |
| 9 | +// You may not use this file except in accordance with one or both of these |
| 10 | +// licenses. |
| 11 | + |
| 12 | +//! Esplora by way of `reqwest` HTTP client. |
| 13 | +
|
| 14 | +use std::collections::HashMap; |
| 15 | + |
| 16 | +use bitcoin::consensus::{deserialize, serialize}; |
| 17 | +use bitcoin::hashes::hex::{FromHex, ToHex}; |
| 18 | +use bitcoin::hashes::{sha256, Hash}; |
| 19 | +use bitcoin::{BlockHeader, Script, Transaction, Txid}; |
| 20 | + |
| 21 | +#[allow(unused_imports)] |
| 22 | +use log::{debug, error, info, trace}; |
| 23 | + |
| 24 | +use reqwest::{Client, StatusCode}; |
| 25 | + |
| 26 | +use crate::{Builder, Error, Tx}; |
| 27 | + |
| 28 | +#[derive(Debug)] |
| 29 | +pub struct AsyncClient { |
| 30 | + url: String, |
| 31 | + client: Client, |
| 32 | +} |
| 33 | + |
| 34 | +impl AsyncClient { |
| 35 | + pub fn from_builder(builder: Builder) -> Result<Self, Error> { |
| 36 | + let mut client_builder = Client::builder(); |
| 37 | + |
| 38 | + #[cfg(not(target_arch = "wasm32"))] |
| 39 | + if let Some(proxy) = &builder.proxy { |
| 40 | + client_builder = client_builder.proxy(reqwest::Proxy::all(proxy)?); |
| 41 | + } |
| 42 | + |
| 43 | + #[cfg(not(target_arch = "wasm32"))] |
| 44 | + if let Some(timeout) = builder.timeout { |
| 45 | + client_builder = client_builder.timeout(core::time::Duration::from_secs(timeout)); |
| 46 | + } |
| 47 | + |
| 48 | + Ok(Self::from_client(builder.base_url, client_builder.build()?)) |
| 49 | + } |
| 50 | + |
| 51 | + pub fn from_client(url: String, client: Client) -> Self { |
| 52 | + AsyncClient { url, client } |
| 53 | + } |
| 54 | + |
| 55 | + pub async fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> { |
| 56 | + let resp = self |
| 57 | + .client |
| 58 | + .get(&format!("{}/tx/{}/raw", self.url, txid)) |
| 59 | + .send() |
| 60 | + .await?; |
| 61 | + |
| 62 | + if let StatusCode::NOT_FOUND = resp.status() { |
| 63 | + return Ok(None); |
| 64 | + } |
| 65 | + |
| 66 | + Ok(Some(deserialize(&resp.error_for_status()?.bytes().await?)?)) |
| 67 | + } |
| 68 | + |
| 69 | + pub async fn get_tx_no_opt(&self, txid: &Txid) -> Result<Transaction, Error> { |
| 70 | + match self.get_tx(txid).await { |
| 71 | + Ok(Some(tx)) => Ok(tx), |
| 72 | + Ok(None) => Err(Error::TransactionNotFound(*txid)), |
| 73 | + Err(e) => Err(e), |
| 74 | + } |
| 75 | + } |
| 76 | + |
| 77 | + pub async fn get_header(&self, block_height: u32) -> Result<BlockHeader, Error> { |
| 78 | + let resp = self |
| 79 | + .client |
| 80 | + .get(&format!("{}/block-height/{}", self.url, block_height)) |
| 81 | + .send() |
| 82 | + .await?; |
| 83 | + |
| 84 | + if let StatusCode::NOT_FOUND = resp.status() { |
| 85 | + return Err(Error::HeaderHeightNotFound(block_height)); |
| 86 | + } |
| 87 | + let bytes = resp.bytes().await?; |
| 88 | + let hash = |
| 89 | + std::str::from_utf8(&bytes).map_err(|_| Error::HeaderHeightNotFound(block_height))?; |
| 90 | + |
| 91 | + let resp = self |
| 92 | + .client |
| 93 | + .get(&format!("{}/block/{}/header", self.url, hash)) |
| 94 | + .send() |
| 95 | + .await?; |
| 96 | + |
| 97 | + let header = deserialize(&Vec::from_hex(&resp.text().await?)?)?; |
| 98 | + |
| 99 | + Ok(header) |
| 100 | + } |
| 101 | + |
| 102 | + pub async fn broadcast(&self, transaction: &Transaction) -> Result<(), Error> { |
| 103 | + self.client |
| 104 | + .post(&format!("{}/tx", self.url)) |
| 105 | + .body(serialize(transaction).to_hex()) |
| 106 | + .send() |
| 107 | + .await? |
| 108 | + .error_for_status()?; |
| 109 | + |
| 110 | + Ok(()) |
| 111 | + } |
| 112 | + |
| 113 | + pub async fn get_height(&self) -> Result<u32, Error> { |
| 114 | + let req = self |
| 115 | + .client |
| 116 | + .get(&format!("{}/blocks/tip/height", self.url)) |
| 117 | + .send() |
| 118 | + .await?; |
| 119 | + |
| 120 | + Ok(req.error_for_status()?.text().await?.parse()?) |
| 121 | + } |
| 122 | + |
| 123 | + pub async fn scripthash_txs( |
| 124 | + &self, |
| 125 | + script: &Script, |
| 126 | + last_seen: Option<Txid>, |
| 127 | + ) -> Result<Vec<Tx>, Error> { |
| 128 | + let script_hash = sha256::Hash::hash(script.as_bytes()).into_inner().to_hex(); |
| 129 | + let url = match last_seen { |
| 130 | + Some(last_seen) => format!( |
| 131 | + "{}/scripthash/{}/txs/chain/{}", |
| 132 | + self.url, script_hash, last_seen |
| 133 | + ), |
| 134 | + None => format!("{}/scripthash/{}/txs", self.url, script_hash), |
| 135 | + }; |
| 136 | + Ok(self |
| 137 | + .client |
| 138 | + .get(url) |
| 139 | + .send() |
| 140 | + .await? |
| 141 | + .error_for_status()? |
| 142 | + .json::<Vec<Tx>>() |
| 143 | + .await?) |
| 144 | + } |
| 145 | + |
| 146 | + pub async fn get_fee_estimates(&self) -> Result<HashMap<String, f64>, Error> { |
| 147 | + Ok(self |
| 148 | + .client |
| 149 | + .get(&format!("{}/fee-estimates", self.url,)) |
| 150 | + .send() |
| 151 | + .await? |
| 152 | + .error_for_status()? |
| 153 | + .json::<HashMap<String, f64>>() |
| 154 | + .await?) |
| 155 | + } |
| 156 | +} |
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