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 484 <span id="481">481</span>
 485 </pre><div class="example-wrap"><pre class="rust ">
 486 <span class="comment">// Magical Bitcoin Library</span>
 487 <span class="comment">// Written in 2020 by</span>
 488 <span class="comment">//     Alekos Filini &lt;alekos.filini@gmail.com&gt;</span>
 489 <span class="comment">//</span>
 490 <span class="comment">// Copyright (c) 2020 Magical Bitcoin</span>
 491 <span class="comment">//</span>
 492 <span class="comment">// Permission is hereby granted, free of charge, to any person obtaining a copy</span>
 493 <span class="comment">// of this software and associated documentation files (the &quot;Software&quot;), to deal</span>
 494 <span class="comment">// in the Software without restriction, including without limitation the rights</span>
 495 <span class="comment">// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
 496 <span class="comment">// copies of the Software, and to permit persons to whom the Software is</span>
 497 <span class="comment">// furnished to do so, subject to the following conditions:</span>
 498 <span class="comment">//</span>
 499 <span class="comment">// The above copyright notice and this permission notice shall be included in all</span>
 500 <span class="comment">// copies or substantial portions of the Software.</span>
 501 <span class="comment">//</span>
 502 <span class="comment">// THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
 503 <span class="comment">// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
 504 <span class="comment">// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
 505 <span class="comment">// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
 506 <span class="comment">// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
 507 <span class="comment">// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span>
 508 <span class="comment">// SOFTWARE.</span>
 509
 510 <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">TryInto</span>;
 511
 512 <span class="kw">use</span> <span class="ident">sled</span>::{<span class="ident">Batch</span>, <span class="ident">Tree</span>};
 513
 514 <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">consensus</span>::<span class="ident">encode</span>::{<span class="ident">deserialize</span>, <span class="ident">serialize</span>};
 515 <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">hash_types</span>::<span class="ident">Txid</span>;
 516 <span class="kw">use</span> <span class="ident">bitcoin</span>::{<span class="ident">OutPoint</span>, <span class="ident">Script</span>, <span class="ident">Transaction</span>};
 517
 518 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">memory</span>::<span class="ident">MapKey</span>;
 519 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">database</span>::{<span class="ident">BatchDatabase</span>, <span class="ident">BatchOperations</span>, <span class="ident">Database</span>};
 520 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
 521 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">types</span>::<span class="kw-2">*</span>;
 522
 523 <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">impl_batch_operations</span> {
 524     ( { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>:<span class="ident">tt</span>)<span class="op">*</span> }, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">process_delete</span>:<span class="ident">ident</span> ) <span class="op">=</span><span class="op">&gt;</span> {
 525         <span class="kw">fn</span> <span class="ident">set_script_pubkey</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">script</span>: <span class="kw-2">&amp;</span><span class="ident">Script</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>, <span class="ident">path</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 526             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Path</span>((<span class="prelude-val">Some</span>(<span class="ident">keychain</span>), <span class="prelude-val">Some</span>(<span class="ident">path</span>))).<span class="ident">as_map_key</span>();
 527             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">serialize</span>(<span class="ident">script</span>))$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 528
 529             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Script</span>(<span class="prelude-val">Some</span>(<span class="ident">script</span>)).<span class="ident">as_map_key</span>();
 530             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({
 531                 <span class="string">&quot;t&quot;</span>: <span class="ident">keychain</span>,
 532                 <span class="string">&quot;p&quot;</span>: <span class="ident">path</span>,
 533             });
 534             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">serde_json</span>::<span class="ident">to_vec</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>)<span class="question-mark">?</span>)$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 535
 536             <span class="prelude-val">Ok</span>(())
 537         }
 538
 539         <span class="kw">fn</span> <span class="ident">set_utxo</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">utxo</span>: <span class="kw-2">&amp;</span><span class="ident">UTXO</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 540             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">UTXO</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">utxo</span>.<span class="ident">outpoint</span>)).<span class="ident">as_map_key</span>();
 541             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">json</span><span class="macro">!</span>({
 542                 <span class="string">&quot;t&quot;</span>: <span class="ident">utxo</span>.<span class="ident">txout</span>,
 543                 <span class="string">&quot;i&quot;</span>: <span class="ident">utxo</span>.<span class="ident">keychain</span>,
 544             });
 545             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">serde_json</span>::<span class="ident">to_vec</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>)<span class="question-mark">?</span>)$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 546
 547             <span class="prelude-val">Ok</span>(())
 548         }
 549
 550         <span class="kw">fn</span> <span class="ident">set_raw_tx</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">transaction</span>: <span class="kw-2">&amp;</span><span class="ident">Transaction</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 551             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">RawTx</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">transaction</span>.<span class="ident">txid</span>())).<span class="ident">as_map_key</span>();
 552             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">serialize</span>(<span class="ident">transaction</span>);
 553             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">value</span>)$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 554
 555             <span class="prelude-val">Ok</span>(())
 556         }
 557
 558         <span class="kw">fn</span> <span class="ident">set_tx</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">transaction</span>: <span class="kw-2">&amp;</span><span class="ident">TransactionDetails</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 559             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Transaction</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">transaction</span>.<span class="ident">txid</span>)).<span class="ident">as_map_key</span>();
 560
 561             <span class="comment">// remove the raw tx from the serialized version</span>
 562             <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">to_value</span>(<span class="ident">transaction</span>)<span class="question-mark">?</span>;
 563             <span class="ident">value</span>[<span class="string">&quot;transaction&quot;</span>] <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">Value</span>::<span class="ident">Null</span>;
 564             <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">to_vec</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>)<span class="question-mark">?</span>;
 565
 566             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">value</span>)$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 567
 568             <span class="comment">// insert the raw_tx if present</span>
 569             <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">tx</span>) <span class="op">=</span> <span class="ident">transaction</span>.<span class="ident">transaction</span> {
 570                 <span class="self">self</span>.<span class="ident">set_raw_tx</span>(<span class="ident">tx</span>)<span class="question-mark">?</span>;
 571             }
 572
 573             <span class="prelude-val">Ok</span>(())
 574         }
 575
 576         <span class="kw">fn</span> <span class="ident">set_last_index</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>, <span class="ident">value</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 577             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">LastIndex</span>(<span class="ident">keychain</span>).<span class="ident">as_map_key</span>();
 578             <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="kw-2">&amp;</span><span class="ident">value</span>.<span class="ident">to_be_bytes</span>())$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">after_insert</span>)<span class="kw-2">*</span>;
 579
 580             <span class="prelude-val">Ok</span>(())
 581         }
 582
 583         <span class="kw">fn</span> <span class="ident">del_script_pubkey_from_path</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>, <span class="ident">path</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Script</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 584             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Path</span>((<span class="prelude-val">Some</span>(<span class="ident">keychain</span>), <span class="prelude-val">Some</span>(<span class="ident">path</span>))).<span class="ident">as_map_key</span>();
 585             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 586             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 587
 588             <span class="prelude-val">Ok</span>(<span class="ident">res</span>.<span class="ident">map_or</span>(<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="prelude-val">Some</span>(<span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">x</span>)).<span class="ident">transpose</span>())<span class="question-mark">?</span>)
 589         }
 590
 591         <span class="kw">fn</span> <span class="ident">del_path_from_script_pubkey</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">script</span>: <span class="kw-2">&amp;</span><span class="ident">Script</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">KeychainKind</span>, <span class="ident">u32</span>)<span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 592             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Script</span>(<span class="prelude-val">Some</span>(<span class="ident">script</span>)).<span class="ident">as_map_key</span>();
 593             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 594             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 595
 596             <span class="kw">match</span> <span class="ident">res</span> {
 597                 <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
 598                 <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> {
 599                     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">serde_json</span>::<span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 600                     <span class="kw">let</span> <span class="ident">st</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;t&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 601                     <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;p&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 602
 603                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>((<span class="ident">st</span>, <span class="ident">path</span>)))
 604                 }
 605             }
 606         }
 607
 608         <span class="kw">fn</span> <span class="ident">del_utxo</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">outpoint</span>: <span class="kw-2">&amp;</span><span class="ident">OutPoint</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">UTXO</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 609             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">UTXO</span>(<span class="prelude-val">Some</span>(<span class="ident">outpoint</span>)).<span class="ident">as_map_key</span>();
 610             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 611             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 612
 613             <span class="kw">match</span> <span class="ident">res</span> {
 614                 <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
 615                 <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> {
 616                     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">serde_json</span>::<span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 617                     <span class="kw">let</span> <span class="ident">txout</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;t&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 618                     <span class="kw">let</span> <span class="ident">keychain</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;i&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 619
 620                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">UTXO</span> { <span class="ident">outpoint</span>: <span class="ident">outpoint</span>.<span class="ident">clone</span>(), <span class="ident">txout</span>, <span class="ident">keychain</span> }))
 621                 }
 622             }
 623         }
 624
 625         <span class="kw">fn</span> <span class="ident">del_raw_tx</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">txid</span>: <span class="kw-2">&amp;</span><span class="ident">Txid</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Transaction</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 626             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">RawTx</span>(<span class="prelude-val">Some</span>(<span class="ident">txid</span>)).<span class="ident">as_map_key</span>();
 627             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 628             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 629
 630             <span class="prelude-val">Ok</span>(<span class="ident">res</span>.<span class="ident">map_or</span>(<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="prelude-val">Some</span>(<span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">x</span>)).<span class="ident">transpose</span>())<span class="question-mark">?</span>)
 631         }
 632
 633         <span class="kw">fn</span> <span class="ident">del_tx</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">txid</span>: <span class="kw-2">&amp;</span><span class="ident">Txid</span>, <span class="ident">include_raw</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TransactionDetails</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 634             <span class="kw">let</span> <span class="ident">raw_tx</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">include_raw</span> {
 635                 <span class="self">self</span>.<span class="ident">del_raw_tx</span>(<span class="ident">txid</span>)<span class="question-mark">?</span>
 636             } <span class="kw">else</span> {
 637                 <span class="prelude-val">None</span>
 638             };
 639
 640             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Transaction</span>(<span class="prelude-val">Some</span>(<span class="ident">txid</span>)).<span class="ident">as_map_key</span>();
 641             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 642             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 643
 644             <span class="kw">match</span> <span class="ident">res</span> {
 645                 <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
 646                 <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> {
 647                     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">TransactionDetails</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 648                     <span class="ident">val</span>.<span class="ident">transaction</span> <span class="op">=</span> <span class="ident">raw_tx</span>;
 649
 650                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">val</span>))
 651                 }
 652             }
 653         }
 654
 655         <span class="kw">fn</span> <span class="ident">del_last_index</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 656             <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">LastIndex</span>(<span class="ident">keychain</span>).<span class="ident">as_map_key</span>();
 657             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
 658             <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro">process_delete</span><span class="macro">!</span>(<span class="macro-nonterminal">res</span>);
 659
 660             <span class="kw">match</span> <span class="ident">res</span> {
 661                 <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
 662                 <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> {
 663                     <span class="kw">let</span> <span class="ident">array</span>: [<span class="ident">u8</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">b</span>.<span class="ident">as_ref</span>().<span class="ident">try_into</span>().<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">Error</span>::<span class="ident">InvalidU32Bytes</span>(<span class="ident">b</span>.<span class="ident">to_vec</span>()))<span class="question-mark">?</span>;
 664                     <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_be_bytes</span>(<span class="ident">array</span>);
 665                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">val</span>))
 666                 }
 667             }
 668         }
 669     }
 670 }
 671
 672 <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">process_delete_tree</span> {
 673     (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">res</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">&gt;</span> {
 674         <span class="macro-nonterminal">$</span><span class="macro-nonterminal">res</span><span class="question-mark">?</span>
 675     };
 676 }
 677 <span class="kw">impl</span> <span class="ident">BatchOperations</span> <span class="kw">for</span> <span class="ident">Tree</span> {
 678     <span class="macro">impl_batch_operations</span><span class="macro">!</span>({<span class="question-mark">?</span>}, <span class="ident">process_delete_tree</span>);
 679 }
 680
 681 <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">process_delete_batch</span> {
 682     (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">res</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">&gt;</span> {
 683         <span class="prelude-val">None</span> <span class="kw">as</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">sled</span>::<span class="ident">IVec</span><span class="op">&gt;</span>
 684     };
 685 }
 686 <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_variables</span>)]</span>
 687 <span class="kw">impl</span> <span class="ident">BatchOperations</span> <span class="kw">for</span> <span class="ident">Batch</span> {
 688     <span class="macro">impl_batch_operations</span><span class="macro">!</span>({}, <span class="ident">process_delete_batch</span>);
 689 }
 690
 691 <span class="kw">impl</span> <span class="ident">Database</span> <span class="kw">for</span> <span class="ident">Tree</span> {
 692     <span class="kw">fn</span> <span class="ident">check_descriptor_checksum</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span><span class="op">&gt;</span>(
 693         <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
 694         <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>,
 695         <span class="ident">bytes</span>: <span class="ident">B</span>,
 696     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 697         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">DescriptorChecksum</span>(<span class="ident">keychain</span>).<span class="ident">as_map_key</span>();
 698
 699         <span class="kw">let</span> <span class="ident">prev</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>)<span class="question-mark">?</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">to_vec</span>());
 700         <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">val</span>) <span class="op">=</span> <span class="ident">prev</span> {
 701             <span class="kw">if</span> <span class="ident">val</span> <span class="op">=</span><span class="op">=</span> <span class="ident">bytes</span>.<span class="ident">as_ref</span>() {
 702                 <span class="prelude-val">Ok</span>(())
 703             } <span class="kw">else</span> {
 704                 <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">ChecksumMismatch</span>)
 705             }
 706         } <span class="kw">else</span> {
 707             <span class="self">self</span>.<span class="ident">insert</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>, <span class="ident">bytes</span>.<span class="ident">as_ref</span>())<span class="question-mark">?</span>;
 708             <span class="prelude-val">Ok</span>(())
 709         }
 710     }
 711
 712     <span class="kw">fn</span> <span class="ident">iter_script_pubkeys</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">keychain</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">KeychainKind</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Script</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 713         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Path</span>((<span class="ident">keychain</span>, <span class="prelude-val">None</span>)).<span class="ident">as_map_key</span>();
 714         <span class="self">self</span>.<span class="ident">scan_prefix</span>(<span class="ident">key</span>)
 715             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 716                 <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">x</span><span class="question-mark">?</span>;
 717                 <span class="prelude-val">Ok</span>(<span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)<span class="question-mark">?</span>)
 718             })
 719             .<span class="ident">collect</span>()
 720     }
 721
 722     <span class="kw">fn</span> <span class="ident">iter_utxos</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">UTXO</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 723         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">UTXO</span>(<span class="prelude-val">None</span>).<span class="ident">as_map_key</span>();
 724         <span class="self">self</span>.<span class="ident">scan_prefix</span>(<span class="ident">key</span>)
 725             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 726                 <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">x</span><span class="question-mark">?</span>;
 727                 <span class="kw">let</span> <span class="ident">outpoint</span> <span class="op">=</span> <span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">k</span>[<span class="number">1</span>..])<span class="question-mark">?</span>;
 728
 729                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">serde_json</span>::<span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)<span class="question-mark">?</span>;
 730                 <span class="kw">let</span> <span class="ident">txout</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;t&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 731                 <span class="kw">let</span> <span class="ident">keychain</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;i&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 732
 733                 <span class="prelude-val">Ok</span>(<span class="ident">UTXO</span> {
 734                     <span class="ident">outpoint</span>,
 735                     <span class="ident">txout</span>,
 736                     <span class="ident">keychain</span>,
 737                 })
 738             })
 739             .<span class="ident">collect</span>()
 740     }
 741
 742     <span class="kw">fn</span> <span class="ident">iter_raw_txs</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Transaction</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 743         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">RawTx</span>(<span class="prelude-val">None</span>).<span class="ident">as_map_key</span>();
 744         <span class="self">self</span>.<span class="ident">scan_prefix</span>(<span class="ident">key</span>)
 745             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 746                 <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">x</span><span class="question-mark">?</span>;
 747                 <span class="prelude-val">Ok</span>(<span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)<span class="question-mark">?</span>)
 748             })
 749             .<span class="ident">collect</span>()
 750     }
 751
 752     <span class="kw">fn</span> <span class="ident">iter_txs</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">include_raw</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">TransactionDetails</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 753         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Transaction</span>(<span class="prelude-val">None</span>).<span class="ident">as_map_key</span>();
 754         <span class="self">self</span>.<span class="ident">scan_prefix</span>(<span class="ident">key</span>)
 755             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 756                 <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">x</span><span class="question-mark">?</span>;
 757                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">txdetails</span>: <span class="ident">TransactionDetails</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)<span class="question-mark">?</span>;
 758                 <span class="kw">if</span> <span class="ident">include_raw</span> {
 759                     <span class="kw">let</span> <span class="ident">txid</span> <span class="op">=</span> <span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">k</span>[<span class="number">1</span>..])<span class="question-mark">?</span>;
 760                     <span class="ident">txdetails</span>.<span class="ident">transaction</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_raw_tx</span>(<span class="kw-2">&amp;</span><span class="ident">txid</span>)<span class="question-mark">?</span>;
 761                 }
 762
 763                 <span class="prelude-val">Ok</span>(<span class="ident">txdetails</span>)
 764             })
 765             .<span class="ident">collect</span>()
 766     }
 767
 768     <span class="kw">fn</span> <span class="ident">get_script_pubkey_from_path</span>(
 769         <span class="kw-2">&amp;</span><span class="self">self</span>,
 770         <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>,
 771         <span class="ident">path</span>: <span class="ident">u32</span>,
 772     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Script</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 773         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Path</span>((<span class="prelude-val">Some</span>(<span class="ident">keychain</span>), <span class="prelude-val">Some</span>(<span class="ident">path</span>))).<span class="ident">as_map_key</span>();
 774         <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)).<span class="ident">transpose</span>()<span class="question-mark">?</span>)
 775     }
 776
 777     <span class="kw">fn</span> <span class="ident">get_path_from_script_pubkey</span>(
 778         <span class="kw-2">&amp;</span><span class="self">self</span>,
 779         <span class="ident">script</span>: <span class="kw-2">&amp;</span><span class="ident">Script</span>,
 780     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">KeychainKind</span>, <span class="ident">u32</span>)<span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 781         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Script</span>(<span class="prelude-val">Some</span>(<span class="ident">script</span>)).<span class="ident">as_map_key</span>();
 782         <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>
 783             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 784                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">serde_json</span>::<span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 785                 <span class="kw">let</span> <span class="ident">st</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;t&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 786                 <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;p&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 787
 788                 <span class="prelude-val">Ok</span>((<span class="ident">st</span>, <span class="ident">path</span>))
 789             })
 790             .<span class="ident">transpose</span>()
 791     }
 792
 793     <span class="kw">fn</span> <span class="ident">get_utxo</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">outpoint</span>: <span class="kw-2">&amp;</span><span class="ident">OutPoint</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">UTXO</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 794         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">UTXO</span>(<span class="prelude-val">Some</span>(<span class="ident">outpoint</span>)).<span class="ident">as_map_key</span>();
 795         <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>
 796             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 797                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">val</span>: <span class="ident">serde_json</span>::<span class="ident">Value</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 798                 <span class="kw">let</span> <span class="ident">txout</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;t&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 799                 <span class="kw">let</span> <span class="ident">keychain</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_value</span>(<span class="ident">val</span>[<span class="string">&quot;i&quot;</span>].<span class="ident">take</span>())<span class="question-mark">?</span>;
 800
 801                 <span class="prelude-val">Ok</span>(<span class="ident">UTXO</span> {
 802                     <span class="ident">outpoint</span>: <span class="kw-2">*</span><span class="ident">outpoint</span>,
 803                     <span class="ident">txout</span>,
 804                     <span class="ident">keychain</span>,
 805                 })
 806             })
 807             .<span class="ident">transpose</span>()
 808     }
 809
 810     <span class="kw">fn</span> <span class="ident">get_raw_tx</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">txid</span>: <span class="kw-2">&amp;</span><span class="ident">Txid</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Transaction</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 811         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">RawTx</span>(<span class="prelude-val">Some</span>(<span class="ident">txid</span>)).<span class="ident">as_map_key</span>();
 812         <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">deserialize</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)).<span class="ident">transpose</span>()<span class="question-mark">?</span>)
 813     }
 814
 815     <span class="kw">fn</span> <span class="ident">get_tx</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">txid</span>: <span class="kw-2">&amp;</span><span class="ident">Txid</span>, <span class="ident">include_raw</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TransactionDetails</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 816         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">Transaction</span>(<span class="prelude-val">Some</span>(<span class="ident">txid</span>)).<span class="ident">as_map_key</span>();
 817         <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>
 818             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 819                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">txdetails</span>: <span class="ident">TransactionDetails</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">from_slice</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>)<span class="question-mark">?</span>;
 820                 <span class="kw">if</span> <span class="ident">include_raw</span> {
 821                     <span class="ident">txdetails</span>.<span class="ident">transaction</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_raw_tx</span>(<span class="kw-2">&amp;</span><span class="ident">txid</span>)<span class="question-mark">?</span>;
 822                 }
 823
 824                 <span class="prelude-val">Ok</span>(<span class="ident">txdetails</span>)
 825             })
 826             .<span class="ident">transpose</span>()
 827     }
 828
 829     <span class="kw">fn</span> <span class="ident">get_last_index</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 830         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">LastIndex</span>(<span class="ident">keychain</span>).<span class="ident">as_map_key</span>();
 831         <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>)<span class="question-mark">?</span>
 832             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 833                 <span class="kw">let</span> <span class="ident">array</span>: [<span class="ident">u8</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">b</span>
 834                     .<span class="ident">as_ref</span>()
 835                     .<span class="ident">try_into</span>()
 836                     .<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">Error</span>::<span class="ident">InvalidU32Bytes</span>(<span class="ident">b</span>.<span class="ident">to_vec</span>()))<span class="question-mark">?</span>;
 837                 <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_be_bytes</span>(<span class="ident">array</span>);
 838                 <span class="prelude-val">Ok</span>(<span class="ident">val</span>)
 839             })
 840             .<span class="ident">transpose</span>()
 841     }
 842
 843     <span class="comment">// inserts 0 if not present</span>
 844     <span class="kw">fn</span> <span class="ident">increment_last_index</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">keychain</span>: <span class="ident">KeychainKind</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 845         <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">MapKey</span>::<span class="ident">LastIndex</span>(<span class="ident">keychain</span>).<span class="ident">as_map_key</span>();
 846         <span class="self">self</span>.<span class="ident">update_and_fetch</span>(<span class="ident">key</span>, <span class="op">|</span><span class="ident">prev</span><span class="op">|</span> {
 847             <span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">prev</span> {
 848                 <span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> {
 849                     <span class="kw">let</span> <span class="ident">array</span>: [<span class="ident">u8</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">b</span>.<span class="ident">try_into</span>().<span class="ident">unwrap_or</span>([<span class="number">0</span>; <span class="number">4</span>]);
 850                     <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_be_bytes</span>(<span class="ident">array</span>);
 851
 852                     <span class="ident">val</span> <span class="op">+</span> <span class="number">1</span>
 853                 }
 854                 <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="number">0</span>,
 855             };
 856
 857             <span class="prelude-val">Some</span>(<span class="ident">new</span>.<span class="ident">to_be_bytes</span>().<span class="ident">to_vec</span>())
 858         })<span class="question-mark">?</span>
 859         .<span class="ident">map_or</span>(<span class="prelude-val">Ok</span>(<span class="number">0</span>), <span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw">_</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
 860             <span class="kw">let</span> <span class="ident">array</span>: [<span class="ident">u8</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">b</span>
 861                 .<span class="ident">as_ref</span>()
 862                 .<span class="ident">try_into</span>()
 863                 .<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">Error</span>::<span class="ident">InvalidU32Bytes</span>(<span class="ident">b</span>.<span class="ident">to_vec</span>()))<span class="question-mark">?</span>;
 864             <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_be_bytes</span>(<span class="ident">array</span>);
 865             <span class="prelude-val">Ok</span>(<span class="ident">val</span>)
 866         })
 867     }
 868 }
 869
 870 <span class="kw">impl</span> <span class="ident">BatchDatabase</span> <span class="kw">for</span> <span class="ident">Tree</span> {
 871     <span class="kw">type</span> <span class="ident">Batch</span> <span class="op">=</span> <span class="ident">sled</span>::<span class="ident">Batch</span>;
 872
 873     <span class="kw">fn</span> <span class="ident">begin_batch</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span>::<span class="ident">Batch</span> {
 874         <span class="ident">sled</span>::<span class="ident">Batch</span>::<span class="ident">default</span>()
 875     }
 876
 877     <span class="kw">fn</span> <span class="ident">commit_batch</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">batch</span>: <span class="self">Self</span>::<span class="ident">Batch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">Error</span><span class="op">&gt;</span> {
 878         <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">apply_batch</span>(<span class="ident">batch</span>)<span class="question-mark">?</span>)
 879     }
 880 }
 881
 882 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
 883 <span class="kw">mod</span> <span class="ident">test</span> {
 884     <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::{<span class="ident">Arc</span>, <span class="ident">Condvar</span>, <span class="ident">Mutex</span>, <span class="ident">Once</span>};
 885     <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">SystemTime</span>, <span class="ident">UNIX_EPOCH</span>};
 886
 887     <span class="kw">use</span> <span class="ident">sled</span>::{<span class="ident">Db</span>, <span class="ident">Tree</span>};
 888
 889     <span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">COUNT</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
 890
 891     <span class="macro">lazy_static</span><span class="macro">!</span> {
 892         <span class="kw">static</span> <span class="kw-2">ref</span> <span class="ident">DB</span>: <span class="ident">Arc</span><span class="op">&lt;</span>(<span class="ident">Mutex</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Db</span><span class="op">&gt;</span><span class="op">&gt;</span>, <span class="ident">Condvar</span>)<span class="op">&gt;</span> <span class="op">=</span>
 893             <span class="ident">Arc</span>::<span class="ident">new</span>((<span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>), <span class="ident">Condvar</span>::<span class="ident">new</span>()));
 894         <span class="kw">static</span> <span class="kw-2">ref</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
 895     }
 896
 897     <span class="kw">fn</span> <span class="ident">get_tree</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Tree</span> {
 898         <span class="kw">unsafe</span> {
 899             <span class="kw">let</span> <span class="ident">cloned</span> <span class="op">=</span> <span class="ident">DB</span>.<span class="ident">clone</span>();
 900             <span class="kw">let</span> (<span class="ident">mutex</span>, <span class="ident">cvar</span>) <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">cloned</span>;
 901
 902             <span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
 903                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">db</span> <span class="op">=</span> <span class="ident">mutex</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
 904
 905                 <span class="kw">let</span> <span class="ident">time</span> <span class="op">=</span> <span class="ident">SystemTime</span>::<span class="ident">now</span>().<span class="ident">duration_since</span>(<span class="ident">UNIX_EPOCH</span>).<span class="ident">unwrap</span>();
 906                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dir</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">env</span>::<span class="ident">temp_dir</span>();
 907                 <span class="ident">dir</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;mbw_{}&quot;</span>, <span class="ident">time</span>.<span class="ident">as_nanos</span>()));
 908
 909                 <span class="kw-2">*</span><span class="ident">db</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">sled</span>::<span class="ident">open</span>(<span class="ident">dir</span>).<span class="ident">unwrap</span>());
 910                 <span class="ident">cvar</span>.<span class="ident">notify_all</span>();
 911             });
 912
 913             <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">db</span> <span class="op">=</span> <span class="ident">mutex</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
 914             <span class="kw">while</span> <span class="op">!</span><span class="ident">db</span>.<span class="ident">is_some</span>() {
 915                 <span class="ident">db</span> <span class="op">=</span> <span class="ident">cvar</span>.<span class="ident">wait</span>(<span class="ident">db</span>).<span class="ident">unwrap</span>();
 916             }
 917
 918             <span class="ident">COUNT</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
 919
 920             <span class="ident">db</span>.<span class="ident">as_ref</span>()
 921                 .<span class="ident">unwrap</span>()
 922                 .<span class="ident">open_tree</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;tree_{}&quot;</span>, <span class="ident">COUNT</span>))
 923                 .<span class="ident">unwrap</span>()
 924         }
 925     }
 926
 927     <span class="attribute">#[<span class="ident">test</span>]</span>
 928     <span class="kw">fn</span> <span class="ident">test_script_pubkey</span>() {
 929         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_script_pubkey</span>(<span class="ident">get_tree</span>());
 930     }
 931
 932     <span class="attribute">#[<span class="ident">test</span>]</span>
 933     <span class="kw">fn</span> <span class="ident">test_batch_script_pubkey</span>() {
 934         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_batch_script_pubkey</span>(<span class="ident">get_tree</span>());
 935     }
 936
 937     <span class="attribute">#[<span class="ident">test</span>]</span>
 938     <span class="kw">fn</span> <span class="ident">test_iter_script_pubkey</span>() {
 939         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_iter_script_pubkey</span>(<span class="ident">get_tree</span>());
 940     }
 941
 942     <span class="attribute">#[<span class="ident">test</span>]</span>
 943     <span class="kw">fn</span> <span class="ident">test_del_script_pubkey</span>() {
 944         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_del_script_pubkey</span>(<span class="ident">get_tree</span>());
 945     }
 946
 947     <span class="attribute">#[<span class="ident">test</span>]</span>
 948     <span class="kw">fn</span> <span class="ident">test_utxo</span>() {
 949         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_utxo</span>(<span class="ident">get_tree</span>());
 950     }
 951
 952     <span class="attribute">#[<span class="ident">test</span>]</span>
 953     <span class="kw">fn</span> <span class="ident">test_raw_tx</span>() {
 954         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_raw_tx</span>(<span class="ident">get_tree</span>());
 955     }
 956
 957     <span class="attribute">#[<span class="ident">test</span>]</span>
 958     <span class="kw">fn</span> <span class="ident">test_tx</span>() {
 959         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_tx</span>(<span class="ident">get_tree</span>());
 960     }
 961
 962     <span class="attribute">#[<span class="ident">test</span>]</span>
 963     <span class="kw">fn</span> <span class="ident">test_last_index</span>() {
 964         <span class="kw">crate</span>::<span class="ident">database</span>::<span class="ident">test</span>::<span class="ident">test_last_index</span>(<span class="ident">get_tree</span>());
 965     }
 966 }
 967 </pre></div>
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