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| </pre><pre class="rust"><code><span class="kw">use </span>std::cmp::Ordering; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::block::BlockContents; |
| <span class="kw">use </span><span class="kw">crate</span>::options::Options; |
| |
| <span class="kw">use </span>integer_encoding::{FixedIntWriter, VarIntWriter}; |
| |
| <span class="doccomment">/// BlockBuilder contains functionality for building a block consisting of consecutive key-value |
| /// entries. |
| </span><span class="kw">pub struct </span>BlockBuilder { |
| opt: Options, |
| buffer: Vec<u8>, |
| restarts: Vec<u32>, |
| |
| last_key: Vec<u8>, |
| restart_counter: usize, |
| counter: usize, |
| } |
| |
| <span class="kw">impl </span>BlockBuilder { |
| <span class="kw">pub fn </span>new(o: Options) -> BlockBuilder { |
| <span class="kw">let </span><span class="kw-2">mut </span>restarts = <span class="macro">vec!</span>[<span class="number">0</span>]; |
| restarts.reserve(<span class="number">1023</span>); |
| |
| BlockBuilder { |
| buffer: Vec::with_capacity(o.block_size), |
| opt: o, |
| restarts, |
| last_key: Vec::new(), |
| restart_counter: <span class="number">0</span>, |
| counter: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>entries(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.counter |
| } |
| |
| <span class="kw">pub fn </span>last_key(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.last_key |
| } |
| |
| <span class="kw">pub fn </span>size_estimate(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.buffer.len() + <span class="number">4 </span>* <span class="self">self</span>.restarts.len() + <span class="number">4 |
| </span>} |
| |
| <span class="kw">pub fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.buffer.clear(); |
| <span class="self">self</span>.restarts.clear(); |
| <span class="self">self</span>.last_key.clear(); |
| <span class="self">self</span>.restart_counter = <span class="number">0</span>; |
| <span class="self">self</span>.counter = <span class="number">0</span>; |
| } |
| |
| <span class="kw">pub fn </span>add(<span class="kw-2">&mut </span><span class="self">self</span>, key: <span class="kw-2">&</span>[u8], val: <span class="kw-2">&</span>[u8]) { |
| <span class="macro">assert!</span>(<span class="self">self</span>.restart_counter <= <span class="self">self</span>.opt.block_restart_interval); |
| <span class="macro">assert!</span>( |
| <span class="self">self</span>.buffer.is_empty() |
| || <span class="self">self</span>.opt.cmp.cmp(<span class="self">self</span>.last_key.as_slice(), key) == Ordering::Less |
| ); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>shared = <span class="number">0</span>; |
| |
| <span class="kw">if </span><span class="self">self</span>.restart_counter < <span class="self">self</span>.opt.block_restart_interval { |
| <span class="kw">let </span>smallest = <span class="kw">if </span><span class="self">self</span>.last_key.len() < key.len() { |
| <span class="self">self</span>.last_key.len() |
| } <span class="kw">else </span>{ |
| key.len() |
| }; |
| |
| <span class="kw">while </span>shared < smallest && <span class="self">self</span>.last_key[shared] == key[shared] { |
| shared += <span class="number">1</span>; |
| } |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.restarts.push(<span class="self">self</span>.buffer.len() <span class="kw">as </span>u32); |
| <span class="self">self</span>.last_key.resize(<span class="number">0</span>, <span class="number">0</span>); |
| <span class="self">self</span>.restart_counter = <span class="number">0</span>; |
| } |
| |
| <span class="kw">let </span>non_shared = key.len() - shared; |
| |
| <span class="self">self</span>.buffer |
| .write_varint(shared) |
| .expect(<span class="string">"write to buffer failed"</span>); |
| <span class="self">self</span>.buffer |
| .write_varint(non_shared) |
| .expect(<span class="string">"write to buffer failed"</span>); |
| <span class="self">self</span>.buffer |
| .write_varint(val.len()) |
| .expect(<span class="string">"write to buffer failed"</span>); |
| <span class="self">self</span>.buffer.extend_from_slice(<span class="kw-2">&</span>key[shared..]); |
| <span class="self">self</span>.buffer.extend_from_slice(val); |
| |
| <span class="comment">// Update key |
| </span><span class="self">self</span>.last_key.resize(shared, <span class="number">0</span>); |
| <span class="self">self</span>.last_key.extend_from_slice(<span class="kw-2">&</span>key[shared..]); |
| |
| <span class="self">self</span>.restart_counter += <span class="number">1</span>; |
| <span class="self">self</span>.counter += <span class="number">1</span>; |
| } |
| |
| <span class="kw">pub fn </span>finish(<span class="kw-2">mut </span><span class="self">self</span>) -> BlockContents { |
| <span class="self">self</span>.buffer.reserve(<span class="self">self</span>.restarts.len() * <span class="number">4 </span>+ <span class="number">4</span>); |
| |
| <span class="comment">// 1. Append RESTARTS |
| </span><span class="kw">for </span>r <span class="kw">in </span><span class="self">self</span>.restarts.iter() { |
| <span class="self">self</span>.buffer |
| .write_fixedint(<span class="kw-2">*</span>r <span class="kw">as </span>u32) |
| .expect(<span class="string">"write to buffer failed"</span>); |
| } |
| |
| <span class="comment">// 2. Append N_RESTARTS |
| </span><span class="self">self</span>.buffer |
| .write_fixedint(<span class="self">self</span>.restarts.len() <span class="kw">as </span>u32) |
| .expect(<span class="string">"write to buffer failed"</span>); |
| |
| <span class="comment">// done |
| </span><span class="self">self</span>.buffer |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"enclave_unit_test"</span>)] |
| </span><span class="kw">pub mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::options; |
| <span class="kw">use </span>teaclave_test_utils::<span class="kw-2">*</span>; |
| |
| <span class="kw">pub fn </span>run_tests() -> bool { |
| <span class="macro">should_panic!</span>(test_block_builder_panics()); |
| <span class="macro">run_tests!</span>(test_block_builder_sanity, test_block_builder_reset,) |
| } |
| |
| <span class="kw">fn </span>get_data() -> Vec<(<span class="kw-2">&</span><span class="lifetime">'static </span>[u8], <span class="kw-2">&</span><span class="lifetime">'static </span>[u8])> { |
| <span class="macro">vec!</span>[ |
| (<span class="string">"key1"</span>.as_bytes(), <span class="string">"value1"</span>.as_bytes()), |
| ( |
| <span class="string">"loooooooooooooooooooooooooooooooooongerkey1"</span>.as_bytes(), |
| <span class="string">"shrtvl1"</span>.as_bytes(), |
| ), |
| (<span class="string">"medium length key 1"</span>.as_bytes(), <span class="string">"some value 2"</span>.as_bytes()), |
| (<span class="string">"prefix_key1"</span>.as_bytes(), <span class="string">"value"</span>.as_bytes()), |
| (<span class="string">"prefix_key2"</span>.as_bytes(), <span class="string">"value"</span>.as_bytes()), |
| (<span class="string">"prefix_key3"</span>.as_bytes(), <span class="string">"value"</span>.as_bytes()), |
| ] |
| } |
| |
| <span class="kw">fn </span>test_block_builder_sanity() { |
| <span class="kw">let </span><span class="kw-2">mut </span>o = options::for_test(); |
| o.block_restart_interval = <span class="number">3</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = BlockBuilder::new(o); |
| <span class="kw">let </span>d = get_data(); |
| |
| <span class="kw">for </span><span class="kw-2">&</span>(k, v) <span class="kw">in </span>d.iter() { |
| builder.add(k, v); |
| <span class="macro">assert!</span>(builder.restart_counter <= <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(builder.last_key(), k); |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="number">149</span>, builder.size_estimate()); |
| <span class="macro">assert_eq!</span>(d.len(), builder.entries()); |
| |
| <span class="kw">let </span>block = builder.finish(); |
| <span class="macro">assert_eq!</span>(block.len(), <span class="number">149</span>); |
| } |
| |
| <span class="kw">fn </span>test_block_builder_reset() { |
| <span class="kw">let </span><span class="kw-2">mut </span>o = options::for_test(); |
| o.block_restart_interval = <span class="number">3</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = BlockBuilder::new(o); |
| <span class="kw">let </span>d = get_data(); |
| |
| <span class="kw">for </span><span class="kw-2">&</span>(k, v) <span class="kw">in </span>d.iter() { |
| builder.add(k, v); |
| <span class="macro">assert!</span>(builder.restart_counter <= <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(builder.last_key(), k); |
| } |
| |
| <span class="macro">assert_eq!</span>(d.len(), builder.entries()); |
| builder.reset(); |
| <span class="macro">assert_eq!</span>(<span class="number">0</span>, builder.entries()); |
| <span class="macro">assert_eq!</span>(<span class="number">4</span>, builder.size_estimate()); |
| } |
| |
| <span class="kw">fn </span>test_block_builder_panics() { |
| <span class="kw">let </span><span class="kw-2">mut </span>d = get_data(); |
| <span class="comment">// Identical key as d[3]. |
| </span>d[<span class="number">4</span>].<span class="number">0 </span>= <span class="string">b"prefix_key1"</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = BlockBuilder::new(options::for_test()); |
| <span class="kw">for </span><span class="kw-2">&</span>(k, v) <span class="kw">in </span>d.iter() { |
| builder.add(k, v); |
| <span class="macro">assert_eq!</span>(k, builder.last_key()); |
| } |
| } |
| <span class="comment">// Additional test coverage is provided by tests in block.rs. |
| </span>} |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rusty_leveldb" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
