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</pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashMap;
<span class="kw">use </span>std::io::{<span class="self">self</span>, Read, Write};
<span class="kw">use </span>std::iter::ExactSizeIterator;
<span class="kw">use </span>std::ops::Range;
<span class="kw">use </span>common::{BinarySerializable, CountingWriter, HasLen, VInt};
<span class="kw">use </span><span class="kw">crate</span>::directory::{FileSlice, TerminatingWrite, WritePtr};
<span class="kw">use </span><span class="kw">crate</span>::schema::Field;
<span class="kw">use </span><span class="kw">crate</span>::space_usage::{FieldUsage, PerFieldSpaceUsage};
<span class="attribute">#[derive(Eq, PartialEq, Hash, Copy, Ord, PartialOrd, Clone, Debug)]
</span><span class="kw">pub struct </span>FileAddr {
field: Field,
idx: usize,
}
<span class="kw">impl </span>FileAddr {
<span class="kw">fn </span>new(field: Field, idx: usize) -&gt; FileAddr {
FileAddr { field, idx }
}
}
<span class="kw">impl </span>BinarySerializable <span class="kw">for </span>FileAddr {
<span class="kw">fn </span>serialize&lt;W: Write&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, writer: <span class="kw-2">&amp;mut </span>W) -&gt; io::Result&lt;()&gt; {
<span class="self">self</span>.field.serialize(writer)<span class="question-mark">?</span>;
VInt(<span class="self">self</span>.idx <span class="kw">as </span>u64).serialize(writer)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>deserialize&lt;R: Read&gt;(reader: <span class="kw-2">&amp;mut </span>R) -&gt; io::Result&lt;<span class="self">Self</span>&gt; {
<span class="kw">let </span>field = Field::deserialize(reader)<span class="question-mark">?</span>;
<span class="kw">let </span>idx = VInt::deserialize(reader)<span class="question-mark">?</span>.<span class="number">0 </span><span class="kw">as </span>usize;
<span class="prelude-val">Ok</span>(FileAddr { field, idx })
}
}
<span class="doccomment">/// A `CompositeWrite` is used to write a `CompositeFile`.
</span><span class="kw">pub struct </span>CompositeWrite&lt;W = WritePtr&gt; {
write: CountingWriter&lt;W&gt;,
offsets: Vec&lt;(FileAddr, u64)&gt;,
}
<span class="kw">impl</span>&lt;W: TerminatingWrite + Write&gt; CompositeWrite&lt;W&gt; {
<span class="doccomment">/// Crate a new API writer that writes a composite file
/// in a given write.
</span><span class="kw">pub fn </span>wrap(w: W) -&gt; CompositeWrite&lt;W&gt; {
CompositeWrite {
write: CountingWriter::wrap(w),
offsets: Vec::new(),
}
}
<span class="doccomment">/// Start writing a new field.
</span><span class="kw">pub fn </span>for_field(<span class="kw-2">&amp;mut </span><span class="self">self</span>, field: Field) -&gt; <span class="kw-2">&amp;mut </span>CountingWriter&lt;W&gt; {
<span class="self">self</span>.for_field_with_idx(field, <span class="number">0</span>)
}
<span class="doccomment">/// Start writing a new field.
</span><span class="kw">pub fn </span>for_field_with_idx(<span class="kw-2">&amp;mut </span><span class="self">self</span>, field: Field, idx: usize) -&gt; <span class="kw-2">&amp;mut </span>CountingWriter&lt;W&gt; {
<span class="kw">let </span>offset = <span class="self">self</span>.write.written_bytes();
<span class="kw">let </span>file_addr = FileAddr::new(field, idx);
<span class="macro">assert!</span>(!<span class="self">self</span>.offsets.iter().any(|el| el.<span class="number">0 </span>== file_addr));
<span class="self">self</span>.offsets.push((file_addr, offset));
<span class="kw-2">&amp;mut </span><span class="self">self</span>.write
}
<span class="doccomment">/// Close the composite file
///
/// An index of the different field offsets
/// will be written as a footer.
</span><span class="kw">pub fn </span>close(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<span class="kw">let </span>footer_offset = <span class="self">self</span>.write.written_bytes();
VInt(<span class="self">self</span>.offsets.len() <span class="kw">as </span>u64).serialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.write)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>prev_offset = <span class="number">0</span>;
<span class="kw">for </span>(file_addr, offset) <span class="kw">in </span><span class="self">self</span>.offsets {
VInt((offset - prev_offset) <span class="kw">as </span>u64).serialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.write)<span class="question-mark">?</span>;
file_addr.serialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.write)<span class="question-mark">?</span>;
prev_offset = offset;
}
<span class="kw">let </span>footer_len = (<span class="self">self</span>.write.written_bytes() - footer_offset) <span class="kw">as </span>u32;
footer_len.serialize(<span class="kw-2">&amp;mut </span><span class="self">self</span>.write)<span class="question-mark">?</span>;
<span class="self">self</span>.write.terminate()
}
}
<span class="doccomment">/// A composite file is an abstraction to store a
/// file partitioned by field.
///
/// The file needs to be written field by field.
/// A footer describes the start and stop offsets
/// for each field.
</span><span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>CompositeFile {
data: FileSlice,
offsets_index: HashMap&lt;FileAddr, Range&lt;usize&gt;&gt;,
}
<span class="kw">impl </span>std::fmt::Debug <span class="kw">for </span>CompositeFile {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>std::fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; std::fmt::Result {
f.debug_struct(<span class="string">&quot;CompositeFile&quot;</span>)
.field(<span class="string">&quot;offsets_index&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.offsets_index)
.finish()
}
}
<span class="kw">impl </span>CompositeFile {
<span class="doccomment">/// Opens a composite file stored in a given
/// `FileSlice`.
</span><span class="kw">pub fn </span>open(data: <span class="kw-2">&amp;</span>FileSlice) -&gt; io::Result&lt;CompositeFile&gt; {
<span class="kw">let </span>end = data.len();
<span class="kw">let </span>footer_len_data = data.slice_from(end - <span class="number">4</span>).read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span>footer_len = u32::deserialize(<span class="kw-2">&amp;mut </span>footer_len_data.as_slice())<span class="question-mark">? </span><span class="kw">as </span>usize;
<span class="kw">let </span>footer_start = end - <span class="number">4 </span>- footer_len;
<span class="kw">let </span>footer_data = data
.slice(footer_start..footer_start + footer_len)
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>footer_buffer = footer_data.as_slice();
<span class="kw">let </span>num_fields = VInt::deserialize(<span class="kw-2">&amp;mut </span>footer_buffer)<span class="question-mark">?</span>.<span class="number">0 </span><span class="kw">as </span>usize;
<span class="kw">let </span><span class="kw-2">mut </span>file_addrs = <span class="macro">vec!</span>[];
<span class="kw">let </span><span class="kw-2">mut </span>offsets = <span class="macro">vec!</span>[];
<span class="kw">let </span><span class="kw-2">mut </span>field_index = HashMap::new();
<span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0</span>;
<span class="kw">for _ in </span><span class="number">0</span>..num_fields {
offset += VInt::deserialize(<span class="kw-2">&amp;mut </span>footer_buffer)<span class="question-mark">?</span>.<span class="number">0 </span><span class="kw">as </span>usize;
<span class="kw">let </span>file_addr = FileAddr::deserialize(<span class="kw-2">&amp;mut </span>footer_buffer)<span class="question-mark">?</span>;
offsets.push(offset);
file_addrs.push(file_addr);
}
offsets.push(footer_start);
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..num_fields {
<span class="kw">let </span>file_addr = file_addrs[i];
<span class="kw">let </span>start_offset = offsets[i];
<span class="kw">let </span>end_offset = offsets[i + <span class="number">1</span>];
field_index.insert(file_addr, start_offset..end_offset);
}
<span class="prelude-val">Ok</span>(CompositeFile {
data: data.slice_to(footer_start),
offsets_index: field_index,
})
}
<span class="doccomment">/// Returns a composite file that stores
/// no fields.
</span><span class="kw">pub fn </span>empty() -&gt; CompositeFile {
CompositeFile {
offsets_index: HashMap::new(),
data: FileSlice::empty(),
}
}
<span class="doccomment">/// Returns the `FileSlice` associated with
/// a given `Field` and stored in a `CompositeFile`.
</span><span class="kw">pub fn </span>open_read(<span class="kw-2">&amp;</span><span class="self">self</span>, field: Field) -&gt; <span class="prelude-ty">Option</span>&lt;FileSlice&gt; {
<span class="self">self</span>.open_read_with_idx(field, <span class="number">0</span>)
}
<span class="doccomment">/// Returns the `FileSlice` associated with
/// a given `Field` and stored in a `CompositeFile`.
</span><span class="kw">pub fn </span>open_read_with_idx(<span class="kw-2">&amp;</span><span class="self">self</span>, field: Field, idx: usize) -&gt; <span class="prelude-ty">Option</span>&lt;FileSlice&gt; {
<span class="self">self</span>.offsets_index
.get(<span class="kw-2">&amp;</span>FileAddr { field, idx })
.map(|byte_range| <span class="self">self</span>.data.slice(byte_range.clone()))
}
<span class="kw">pub fn </span>space_usage(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; PerFieldSpaceUsage {
<span class="kw">let </span><span class="kw-2">mut </span>fields = HashMap::new();
<span class="kw">for </span>(<span class="kw-2">&amp;</span>field_addr, byte_range) <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.offsets_index {
fields
.entry(field_addr.field)
.or_insert_with(|| FieldUsage::empty(field_addr.field))
.add_field_idx(field_addr.idx, byte_range.len());
}
PerFieldSpaceUsage::new(fields)
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>test {
<span class="kw">use </span>std::io::Write;
<span class="kw">use </span>std::path::Path;
<span class="kw">use </span>common::{BinarySerializable, VInt};
<span class="kw">use super</span>::{CompositeFile, CompositeWrite};
<span class="kw">use </span><span class="kw">crate</span>::directory::{Directory, RamDirectory};
<span class="kw">use </span><span class="kw">crate</span>::schema::Field;
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_composite_file() -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
<span class="kw">let </span>path = Path::new(<span class="string">&quot;test_path&quot;</span>);
<span class="kw">let </span>directory = RamDirectory::create();
{
<span class="kw">let </span>w = directory.open_write(path).unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>composite_write = CompositeWrite::wrap(w);
<span class="kw">let </span><span class="kw-2">mut </span>write_0 = composite_write.for_field(Field::from_field_id(<span class="number">0u32</span>));
VInt(<span class="number">32431123u64</span>).serialize(<span class="kw-2">&amp;mut </span>write_0)<span class="question-mark">?</span>;
write_0.flush()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>write_4 = composite_write.for_field(Field::from_field_id(<span class="number">4u32</span>));
VInt(<span class="number">2</span>).serialize(<span class="kw-2">&amp;mut </span>write_4)<span class="question-mark">?</span>;
write_4.flush()<span class="question-mark">?</span>;
composite_write.close()<span class="question-mark">?</span>;
}
{
<span class="kw">let </span>r = directory.open_read(path)<span class="question-mark">?</span>;
<span class="kw">let </span>composite_file = CompositeFile::open(<span class="kw-2">&amp;</span>r)<span class="question-mark">?</span>;
{
<span class="kw">let </span>file0 = composite_file
.open_read(Field::from_field_id(<span class="number">0u32</span>))
.unwrap()
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>file0_buf = file0.as_slice();
<span class="kw">let </span>payload_0 = VInt::deserialize(<span class="kw-2">&amp;mut </span>file0_buf)<span class="question-mark">?</span>.<span class="number">0</span>;
<span class="macro">assert_eq!</span>(file0_buf.len(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(payload_0, <span class="number">32431123u64</span>);
}
{
<span class="kw">let </span>file4 = composite_file
.open_read(Field::from_field_id(<span class="number">4u32</span>))
.unwrap()
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>file4_buf = file4.as_slice();
<span class="kw">let </span>payload_4 = VInt::deserialize(<span class="kw-2">&amp;mut </span>file4_buf)<span class="question-mark">?</span>.<span class="number">0</span>;
<span class="macro">assert_eq!</span>(file4_buf.len(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(payload_4, <span class="number">2u64</span>);
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_composite_file_bug() -&gt; <span class="kw">crate</span>::Result&lt;()&gt; {
<span class="kw">let </span>path = Path::new(<span class="string">&quot;test_path&quot;</span>);
<span class="kw">let </span>directory = RamDirectory::create();
{
<span class="kw">let </span>w = directory.open_write(path).unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>composite_write = CompositeWrite::wrap(w);
<span class="kw">let </span><span class="kw-2">mut </span>write = composite_write.for_field_with_idx(Field::from_field_id(<span class="number">1u32</span>), <span class="number">0</span>);
VInt(<span class="number">32431123u64</span>).serialize(<span class="kw-2">&amp;mut </span>write)<span class="question-mark">?</span>;
write.flush()<span class="question-mark">?</span>;
<span class="kw">let </span>write = composite_write.for_field_with_idx(Field::from_field_id(<span class="number">1u32</span>), <span class="number">1</span>);
write.flush()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>write = composite_write.for_field_with_idx(Field::from_field_id(<span class="number">0u32</span>), <span class="number">0</span>);
VInt(<span class="number">1_000_000</span>).serialize(<span class="kw-2">&amp;mut </span>write)<span class="question-mark">?</span>;
write.flush()<span class="question-mark">?</span>;
composite_write.close()<span class="question-mark">?</span>;
}
{
<span class="kw">let </span>r = directory.open_read(path)<span class="question-mark">?</span>;
<span class="kw">let </span>composite_file = CompositeFile::open(<span class="kw-2">&amp;</span>r)<span class="question-mark">?</span>;
{
<span class="kw">let </span>file = composite_file
.open_read_with_idx(Field::from_field_id(<span class="number">1u32</span>), <span class="number">0</span>)
.unwrap()
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>file0_buf = file.as_slice();
<span class="kw">let </span>payload_0 = VInt::deserialize(<span class="kw-2">&amp;mut </span>file0_buf)<span class="question-mark">?</span>.<span class="number">0</span>;
<span class="macro">assert_eq!</span>(file0_buf.len(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(payload_0, <span class="number">32431123u64</span>);
}
{
<span class="kw">let </span>file = composite_file
.open_read_with_idx(Field::from_field_id(<span class="number">1u32</span>), <span class="number">1</span>)
.unwrap()
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span>file = file.as_slice();
<span class="macro">assert_eq!</span>(file.len(), <span class="number">0</span>);
}
{
<span class="kw">let </span>file = composite_file
.open_read_with_idx(Field::from_field_id(<span class="number">0u32</span>), <span class="number">0</span>)
.unwrap()
.read_bytes()<span class="question-mark">?</span>;
<span class="kw">let </span>file = file.as_slice();
<span class="macro">assert_eq!</span>(file.len(), <span class="number">3</span>);
}
}
<span class="prelude-val">Ok</span>(())
}
}
</code></pre></div>
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