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194 </pre><div class="example-wrap"><pre class="rust ">
195 <span class="comment">// Magical Bitcoin Library</span>
196 <span class="comment">// Written in 2020 by</span>
197 <span class="comment">// Alekos Filini <alekos.filini@gmail.com></span>
198 <span class="comment">//</span>
199 <span class="comment">// Copyright (c) 2020 Magical Bitcoin</span>
200 <span class="comment">//</span>
201 <span class="comment">// Permission is hereby granted, free of charge, to any person obtaining a copy</span>
202 <span class="comment">// of this software and associated documentation files (the "Software"), to deal</span>
203 <span class="comment">// in the Software without restriction, including without limitation the rights</span>
204 <span class="comment">// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
205 <span class="comment">// copies of the Software, and to permit persons to whom the Software is</span>
206 <span class="comment">// furnished to do so, subject to the following conditions:</span>
207 <span class="comment">//</span>
208 <span class="comment">// The above copyright notice and this permission notice shall be included in all</span>
209 <span class="comment">// copies or substantial portions of the Software.</span>
210 <span class="comment">//</span>
211 <span class="comment">// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
212 <span class="comment">// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
213 <span class="comment">// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
214 <span class="comment">// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
215 <span class="comment">// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
216 <span class="comment">// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span>
217 <span class="comment">// SOFTWARE.</span>
219 <span class="doccomment">//! Electrum</span>
220 <span class="doccomment">//!</span>
221 <span class="doccomment">//! This module defines a [`Blockchain`] struct that wraps an [`electrum_client::Client`]</span>
222 <span class="doccomment">//! and implements the logic required to populate the wallet's [database](crate::database::Database) by</span>
223 <span class="doccomment">//! querying the inner client.</span>
224 <span class="doccomment">//!</span>
225 <span class="doccomment">//! ## Example</span>
226 <span class="doccomment">//!</span>
227 <span class="doccomment">//! ```no_run</span>
228 <span class="doccomment">//! # use bdk::blockchain::electrum::ElectrumBlockchain;</span>
229 <span class="doccomment">//! let client = electrum_client::Client::new("ssl://electrum.blockstream.info:50002")?;</span>
230 <span class="doccomment">//! let blockchain = ElectrumBlockchain::from(client);</span>
231 <span class="doccomment">//! # Ok::<(), bdk::Error>(())</span>
232 <span class="doccomment">//! ```</span>
234 <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
236 <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span>
237 <span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">debug</span>, <span class="ident">error</span>, <span class="ident">info</span>, <span class="ident">trace</span>};
239 <span class="kw">use</span> <span class="ident">bitcoin</span>::{<span class="ident">BlockHeader</span>, <span class="ident">Script</span>, <span class="ident">Transaction</span>, <span class="ident">Txid</span>};
241 <span class="kw">use</span> <span class="ident">electrum_client</span>::{<span class="ident">Client</span>, <span class="ident">ConfigBuilder</span>, <span class="ident">ElectrumApi</span>, <span class="ident">Socks5Config</span>};
243 <span class="kw">use</span> <span class="self">self</span>::<span class="ident">utils</span>::{<span class="ident">ELSGetHistoryRes</span>, <span class="ident">ElectrumLikeSync</span>};
244 <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
245 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">BatchDatabase</span>;
246 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
247 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">FeeRate</span>;
249 <span class="doccomment">/// Wrapper over an Electrum Client that implements the required blockchain traits</span>
250 <span class="doccomment">///</span>
251 <span class="doccomment">/// ## Example</span>
252 <span class="doccomment">/// See the [`blockchain::electrum`](crate::blockchain::electrum) module for a usage example.</span>
253 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ElectrumBlockchain</span>(<span class="ident">Client</span>);
255 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
256 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"test-electrum"</span>)]</span>
257 <span class="attribute">#[<span class="ident">bdk_blockchain_tests</span>(<span class="kw">crate</span>)]</span>
258 <span class="kw">fn</span> <span class="ident">local_electrs</span>() <span class="op">-</span><span class="op">></span> <span class="ident">ElectrumBlockchain</span> {
259 <span class="ident">ElectrumBlockchain</span>::<span class="ident">from</span>(<span class="ident">Client</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="ident">testutils</span>::<span class="ident">get_electrum_url</span>()).<span class="ident">unwrap</span>())
262 <span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">From</span><span class="op"><</span><span class="ident">Client</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ElectrumBlockchain</span> {
263 <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">client</span>: <span class="ident">Client</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
264 <span class="ident">ElectrumBlockchain</span>(<span class="ident">client</span>)
268 <span class="kw">impl</span> <span class="ident">Blockchain</span> <span class="kw">for</span> <span class="ident">ElectrumBlockchain</span> {
269 <span class="kw">fn</span> <span class="ident">get_capabilities</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">Capability</span><span class="op">></span> {
270 <span class="macro">vec</span><span class="macro">!</span>[
271 <span class="ident">Capability</span>::<span class="ident">FullHistory</span>,
272 <span class="ident">Capability</span>::<span class="ident">GetAnyTx</span>,
273 <span class="ident">Capability</span>::<span class="ident">AccurateFees</span>,
275 .<span class="ident">into_iter</span>()
276 .<span class="ident">collect</span>()
279 <span class="kw">fn</span> <span class="ident">setup</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">BatchDatabase</span>, <span class="ident">P</span>: <span class="ident">Progress</span><span class="op">></span>(
280 <span class="kw-2">&</span><span class="self">self</span>,
281 <span class="ident">stop_gap</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>,
282 <span class="ident">database</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">D</span>,
283 <span class="ident">progress_update</span>: <span class="ident">P</span>,
284 ) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> {
285 <span class="self">self</span>.<span class="number">0</span>
286 .<span class="ident">electrum_like_setup</span>(<span class="ident">stop_gap</span>, <span class="ident">database</span>, <span class="ident">progress_update</span>)
289 <span class="kw">fn</span> <span class="ident">get_tx</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">txid</span>: <span class="kw-2">&</span><span class="ident">Txid</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Transaction</span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> {
290 <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">transaction_get</span>(<span class="ident">txid</span>).<span class="ident">map</span>(<span class="prelude-ty">Option</span>::<span class="prelude-val">Some</span>)<span class="question-mark">?</span>)
293 <span class="kw">fn</span> <span class="ident">broadcast</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tx</span>: <span class="kw-2">&</span><span class="ident">Transaction</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> {
294 <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">transaction_broadcast</span>(<span class="ident">tx</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())<span class="question-mark">?</span>)
297 <span class="kw">fn</span> <span class="ident">get_height</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u32</span>, <span class="ident">Error</span><span class="op">></span> {
298 <span class="comment">// TODO: unsubscribe when added to the client, or is there a better call to use here?</span>
300 <span class="prelude-val">Ok</span>(<span class="self">self</span>
301 .<span class="number">0</span>
302 .<span class="ident">block_headers_subscribe</span>()
303 .<span class="ident">map</span>(<span class="op">|</span><span class="ident">data</span><span class="op">|</span> <span class="ident">data</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">u32</span>)<span class="question-mark">?</span>)
306 <span class="kw">fn</span> <span class="ident">estimate_fee</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">target</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">FeeRate</span>, <span class="ident">Error</span><span class="op">></span> {
307 <span class="prelude-val">Ok</span>(<span class="ident">FeeRate</span>::<span class="ident">from_btc_per_kvb</span>(
308 <span class="self">self</span>.<span class="number">0</span>.<span class="ident">estimate_fee</span>(<span class="ident">target</span>)<span class="question-mark">?</span> <span class="kw">as</span> <span class="ident">f32</span>
313 <span class="kw">impl</span> <span class="ident">ElectrumLikeSync</span> <span class="kw">for</span> <span class="ident">Client</span> {
314 <span class="kw">fn</span> <span class="ident">els_batch_script_get_history</span><span class="op"><</span><span class="lifetime">'s</span>, <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'s</span> <span class="ident">Script</span><span class="op">></span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span>(
315 <span class="kw-2">&</span><span class="self">self</span>,
316 <span class="ident">scripts</span>: <span class="ident">I</span>,
317 ) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">ELSGetHistoryRes</span><span class="op">></span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> {
318 <span class="self">self</span>.<span class="ident">batch_script_get_history</span>(<span class="ident">scripts</span>)
319 .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
320 <span class="ident">v</span>.<span class="ident">into_iter</span>()
321 .<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
322 <span class="ident">v</span>.<span class="ident">into_iter</span>()
323 .<span class="ident">map</span>(
324 <span class="op">|</span><span class="ident">electrum_client</span>::<span class="ident">GetHistoryRes</span> {
325 <span class="ident">height</span>, <span class="ident">tx_hash</span>, ..
326 }<span class="op">|</span> <span class="ident">ELSGetHistoryRes</span> {
327 <span class="ident">height</span>,
328 <span class="ident">tx_hash</span>,
331 .<span class="ident">collect</span>()
333 .<span class="ident">collect</span>()
335 .<span class="ident">map_err</span>(<span class="ident">Error</span>::<span class="ident">Electrum</span>)
338 <span class="kw">fn</span> <span class="ident">els_batch_transaction_get</span><span class="op"><</span><span class="lifetime">'s</span>, <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'s</span> <span class="ident">Txid</span><span class="op">></span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span>(
339 <span class="kw-2">&</span><span class="self">self</span>,
340 <span class="ident">txids</span>: <span class="ident">I</span>,
341 ) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Transaction</span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> {
342 <span class="self">self</span>.<span class="ident">batch_transaction_get</span>(<span class="ident">txids</span>).<span class="ident">map_err</span>(<span class="ident">Error</span>::<span class="ident">Electrum</span>)
345 <span class="kw">fn</span> <span class="ident">els_batch_block_header</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">u32</span><span class="op">></span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span>(
346 <span class="kw-2">&</span><span class="self">self</span>,
347 <span class="ident">heights</span>: <span class="ident">I</span>,
348 ) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">BlockHeader</span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> {
349 <span class="self">self</span>.<span class="ident">batch_block_header</span>(<span class="ident">heights</span>).<span class="ident">map_err</span>(<span class="ident">Error</span>::<span class="ident">Electrum</span>)
353 <span class="doccomment">/// Configuration for an [`ElectrumBlockchain`]</span>
354 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">serde</span>::<span class="ident">Deserialize</span>, <span class="ident">serde</span>::<span class="ident">Serialize</span>)]</span>
355 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ElectrumBlockchainConfig</span> {
356 <span class="doccomment">/// URL of the Electrum server (such as ElectrumX, Esplora, BWT) may start with `ssl://` or `tcp://` and include a port</span>
357 <span class="doccomment">///</span>
358 <span class="doccomment">/// eg. `ssl://electrum.blockstream.info:60002`</span>
359 <span class="kw">pub</span> <span class="ident">url</span>: <span class="ident">String</span>,
360 <span class="doccomment">/// URL of the socks5 proxy server or a Tor service</span>
361 <span class="kw">pub</span> <span class="ident">socks5</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
362 <span class="doccomment">/// Request retry count</span>
363 <span class="kw">pub</span> <span class="ident">retry</span>: <span class="ident">u8</span>,
364 <span class="doccomment">/// Request timeout (seconds)</span>
365 <span class="kw">pub</span> <span class="ident">timeout</span>: <span class="ident">u8</span>,
368 <span class="kw">impl</span> <span class="ident">ConfigurableBlockchain</span> <span class="kw">for</span> <span class="ident">ElectrumBlockchain</span> {
369 <span class="kw">type</span> <span class="ident">Config</span> <span class="op">=</span> <span class="ident">ElectrumBlockchainConfig</span>;
371 <span class="kw">fn</span> <span class="ident">from_config</span>(<span class="ident">config</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Config</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">Error</span><span class="op">></span> {
372 <span class="kw">let</span> <span class="ident">socks5</span> <span class="op">=</span> <span class="ident">config</span>.<span class="ident">socks5</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="ident">Socks5Config</span>::<span class="ident">new</span>);
373 <span class="kw">let</span> <span class="ident">electrum_config</span> <span class="op">=</span> <span class="ident">ConfigBuilder</span>::<span class="ident">new</span>()
374 .<span class="ident">retry</span>(<span class="ident">config</span>.<span class="ident">retry</span>)
375 .<span class="ident">socks5</span>(<span class="ident">socks5</span>)<span class="question-mark">?</span>
376 .<span class="ident">timeout</span>(<span class="ident">config</span>.<span class="ident">timeout</span>)<span class="question-mark">?</span>
377 .<span class="ident">build</span>();
379 <span class="prelude-val">Ok</span>(<span class="ident">ElectrumBlockchain</span>(<span class="ident">Client</span>::<span class="ident">from_config</span>(
380 <span class="ident">config</span>.<span class="ident">url</span>.<span class="ident">as_str</span>(),
381 <span class="ident">electrum_config</span>,
382 )<span class="question-mark">?</span>))
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