removes redundant args from Shredder::try_recovery (#21226)
Shredder::try_recovery is already taking a Vec<Shred> as an argument. All the other arguments are embedded in the shreds, and are so redundant.
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fa7b5ef750
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@ -148,14 +148,7 @@ fn bench_shredder_decoding(bencher: &mut Bencher) {
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true, // is_last_in_slot
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);
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bencher.iter(|| {
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Shredder::try_recovery(
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coding_shreds[..].to_vec(),
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symbol_count,
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symbol_count,
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0, // first index
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1, // slot
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)
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.unwrap();
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Shredder::try_recovery(coding_shreds[..].to_vec()).unwrap();
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})
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}
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@ -725,13 +725,7 @@ impl Blockstore {
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code_cf,
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);
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if let Ok(mut result) = Shredder::try_recovery(
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available_shreds,
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erasure_meta.config.num_data(),
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erasure_meta.config.num_coding(),
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set_index as usize,
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slot,
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) {
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if let Ok(mut result) = Shredder::try_recovery(available_shreds) {
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Self::submit_metrics(
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slot,
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set_index,
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@ -813,30 +813,51 @@ impl Shredder {
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pub fn try_recovery(
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shreds: Vec<Shred>,
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num_data: usize,
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num_coding: usize,
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first_index: usize,
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slot: Slot,
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) -> std::result::Result<Vec<Shred>, reed_solomon_erasure::Error> {
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use reed_solomon_erasure::Error::InvalidIndex;
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Self::verify_consistent_shred_payload_sizes("try_recovery()", &shreds)?;
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let fec_set_size = num_data + num_coding;
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if num_coding == 0 || shreds.len() >= fec_set_size {
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let (slot, fec_set_index) = match shreds.first() {
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None => return Ok(Vec::default()),
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Some(shred) => (shred.slot(), shred.common_header.fec_set_index),
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};
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let (num_data_shreds, num_coding_shreds) = match shreds.iter().find(|shred| shred.is_code())
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{
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None => return Ok(Vec::default()),
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Some(shred) => (
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shred.coding_header.num_data_shreds,
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shred.coding_header.num_coding_shreds,
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),
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};
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debug_assert!(shreds.iter().all(
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|shred| shred.slot() == slot && shred.common_header.fec_set_index == fec_set_index
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));
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debug_assert!(shreds
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.iter()
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.filter(|shred| shred.is_code())
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.all(
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|shred| shred.coding_header.num_data_shreds == num_data_shreds
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&& shred.coding_header.num_coding_shreds == num_coding_shreds
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));
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let num_data_shreds = num_data_shreds as usize;
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let num_coding_shreds = num_coding_shreds as usize;
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let fec_set_index = fec_set_index as usize;
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let fec_set_size = num_data_shreds + num_coding_shreds;
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if num_coding_shreds == 0 || shreds.len() >= fec_set_size {
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return Ok(Vec::default());
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}
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// Mask to exclude data shreds already received from the return value.
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let mut mask = vec![false; num_data];
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let mut mask = vec![false; num_data_shreds];
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let mut blocks = vec![None; fec_set_size];
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for shred in shreds {
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if (shred.index() as usize) < first_index {
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if (shred.index() as usize) < fec_set_index {
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return Err(InvalidIndex);
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}
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let shred_is_data = shred.is_data();
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let offset = if shred_is_data { 0 } else { num_data };
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let index = offset + shred.index() as usize - first_index;
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let offset = if shred_is_data { 0 } else { num_data_shreds };
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let index = offset + shred.index() as usize - fec_set_index;
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let mut block = shred.payload;
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if shred_is_data {
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if index >= num_data {
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if index >= num_data_shreds {
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return Err(InvalidIndex);
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}
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mask[index] = true;
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@ -854,8 +875,8 @@ impl Shredder {
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};
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blocks[index] = Some(block);
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}
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Session::new(num_data, num_coding)?.decode_blocks(&mut blocks)?;
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let data_shred_indices = first_index..first_index + num_data;
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Session::new(num_data_shreds, num_coding_shreds)?.decode_blocks(&mut blocks)?;
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let data_shred_indices = fec_set_index..fec_set_index + num_data_shreds;
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let recovered_data = mask
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.into_iter()
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.zip(blocks)
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@ -1367,26 +1388,13 @@ pub mod tests {
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.collect::<Vec<_>>();
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// Test0: Try recovery/reassembly with only data shreds, but not all data shreds. Hint: should fail
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assert_matches!(
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Shredder::try_recovery(
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data_shreds[..data_shreds.len() - 1].to_vec(),
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num_data_shreds,
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num_coding_shreds,
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0,
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slot
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),
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Err(reed_solomon_erasure::Error::TooFewShardsPresent)
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assert_eq!(
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Shredder::try_recovery(data_shreds[..data_shreds.len() - 1].to_vec(),),
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Ok(Vec::default())
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);
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// Test1: Try recovery/reassembly with only data shreds. Hint: should work
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let recovered_data = Shredder::try_recovery(
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data_shreds[..].to_vec(),
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num_data_shreds,
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num_coding_shreds,
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0,
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slot,
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)
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.unwrap();
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let recovered_data = Shredder::try_recovery(data_shreds[..].to_vec()).unwrap();
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assert!(recovered_data.is_empty());
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// Test2: Try recovery/reassembly with missing data shreds + coding shreds. Hint: should work
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@ -1396,14 +1404,7 @@ pub mod tests {
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.filter_map(|(i, b)| if i % 2 == 0 { Some(b.clone()) } else { None })
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.collect();
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let mut recovered_data = Shredder::try_recovery(
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shred_info.clone(),
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num_data_shreds,
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num_coding_shreds,
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0,
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slot,
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)
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.unwrap();
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let mut recovered_data = Shredder::try_recovery(shred_info.clone()).unwrap();
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assert_eq!(recovered_data.len(), 2); // Data shreds 1 and 3 were missing
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let recovered_shred = recovered_data.remove(0);
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@ -1443,14 +1444,7 @@ pub mod tests {
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.filter_map(|(i, b)| if i % 2 != 0 { Some(b.clone()) } else { None })
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.collect();
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let recovered_data = Shredder::try_recovery(
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shred_info.clone(),
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num_data_shreds,
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num_coding_shreds,
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0,
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slot,
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)
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.unwrap();
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let recovered_data = Shredder::try_recovery(shred_info.clone()).unwrap();
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assert_eq!(recovered_data.len(), 3); // Data shreds 0, 2, 4 were missing
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for (i, recovered_shred) in recovered_data.into_iter().enumerate() {
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@ -1500,7 +1494,6 @@ pub mod tests {
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let serialized_entries = bincode::serialize(&entries).unwrap();
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let (data_shreds, coding_shreds, _) =
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shredder.entries_to_shreds(&keypair, &entries, true, 25);
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let num_coding_shreds = coding_shreds.len();
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// We should have 10 shreds now
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assert_eq!(data_shreds.len(), num_data_shreds);
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@ -1516,14 +1509,7 @@ pub mod tests {
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.filter_map(|(i, b)| if i % 2 != 0 { Some(b.clone()) } else { None })
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.collect();
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let recovered_data = Shredder::try_recovery(
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shred_info.clone(),
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num_data_shreds,
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num_coding_shreds,
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25,
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slot,
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)
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.unwrap();
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let recovered_data = Shredder::try_recovery(shred_info.clone()).unwrap();
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assert_eq!(recovered_data.len(), 3); // Data shreds 25, 27, 29 were missing
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for (i, recovered_shred) in recovered_data.into_iter().enumerate() {
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@ -1547,33 +1533,8 @@ pub mod tests {
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assert_eq!(serialized_entries[..], result[..serialized_entries.len()]);
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// Test6: Try recovery/reassembly with incorrect slot. Hint: does not recover any shreds
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let recovered_data = Shredder::try_recovery(
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shred_info.clone(),
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num_data_shreds,
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num_coding_shreds,
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25,
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slot + 1,
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)
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.unwrap();
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let recovered_data = Shredder::try_recovery(shred_info.clone()).unwrap();
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assert!(recovered_data.is_empty());
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// Test7: Try recovery/reassembly with incorrect index. Hint: does not recover any shreds
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assert_matches!(
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Shredder::try_recovery(
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shred_info.clone(),
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num_data_shreds,
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num_coding_shreds,
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15,
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slot,
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),
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Err(reed_solomon_erasure::Error::InvalidIndex)
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);
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// Test8: Try recovery/reassembly with incorrect index. Hint: does not recover any shreds
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assert_matches!(
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Shredder::try_recovery(shred_info, num_data_shreds, num_coding_shreds, 35, slot),
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Err(reed_solomon_erasure::Error::InvalidIndex)
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);
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}
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#[test]
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@ -1619,7 +1580,6 @@ pub mod tests {
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let (data_shreds, coding_shreds, _) =
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shredder.entries_to_shreds(&keypair, &[entry], is_last_in_slot, next_shred_index);
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let num_data_shreds = data_shreds.len();
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let num_coding_shreds = coding_shreds.len();
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let mut shreds = coding_shreds;
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shreds.extend(data_shreds.iter().cloned());
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shreds.shuffle(&mut rng);
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@ -1636,14 +1596,7 @@ pub mod tests {
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.filter(|shred| shred.is_data())
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.map(|shred| shred.index())
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.collect();
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let recovered_shreds = Shredder::try_recovery(
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shreds,
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num_data_shreds,
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num_coding_shreds,
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next_shred_index as usize, // first index
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slot,
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)
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.unwrap();
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let recovered_shreds = Shredder::try_recovery(shreds).unwrap();
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assert_eq!(
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recovered_shreds,
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data_shreds
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@ -72,14 +72,7 @@ fn test_multi_fec_block_coding() {
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.filter_map(|(i, b)| if i % 2 != 0 { Some(b.clone()) } else { None })
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.collect();
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let recovered_data = Shredder::try_recovery(
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shred_info.clone(),
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MAX_DATA_SHREDS_PER_FEC_BLOCK as usize,
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MAX_DATA_SHREDS_PER_FEC_BLOCK as usize,
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shred_start_index,
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slot,
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)
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.unwrap();
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let recovered_data = Shredder::try_recovery(shred_info.clone()).unwrap();
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for (i, recovered_shred) in recovered_data.into_iter().enumerate() {
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let index = shred_start_index + (i * 2);
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@ -122,17 +115,13 @@ fn test_multi_fec_block_different_size_coding() {
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let first_data_index = fec_data_shreds.first().unwrap().index() as usize;
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let first_code_index = fec_coding_shreds.first().unwrap().index() as usize;
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assert_eq!(first_data_index, first_code_index);
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let num_data = fec_data_shreds.len();
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let num_coding = fec_coding_shreds.len();
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let all_shreds: Vec<Shred> = fec_data_shreds
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.iter()
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.step_by(2)
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.chain(fec_coding_shreds.iter().step_by(2))
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.cloned()
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.collect();
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let recovered_data =
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Shredder::try_recovery(all_shreds, num_data, num_coding, first_data_index, slot)
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.unwrap();
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let recovered_data = Shredder::try_recovery(all_shreds).unwrap();
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// Necessary in order to ensure the last shred in the slot
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// is part of the recovered set, and that the below `index`
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// calcuation in the loop is correct
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