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solana/src/erasure.rs

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// Support erasure coding
use db_ledger::DbLedger;
use db_window::{find_missing_coding_indexes, find_missing_data_indexes};
use packet::{Blob, SharedBlob, BLOB_DATA_SIZE, BLOB_HEADER_SIZE, BLOB_SIZE};
use result::{Error, Result};
use solana_sdk::pubkey::Pubkey;
use std::cmp;
use std::sync::{Arc, RwLock};
use window::WindowSlot;
//TODO(sakridge) pick these values
pub const NUM_DATA: usize = 16; // number of data blobs
pub const NUM_CODING: usize = 4; // number of coding blobs, also the maximum number that can go missing
pub const ERASURE_SET_SIZE: usize = NUM_DATA + NUM_CODING; // total number of blobs in an erasure set, includes data and coding blobs
pub const JERASURE_ALIGN: usize = 4; // data size has to be a multiple of 4 bytes
macro_rules! align {
($x:expr, $align:expr) => {
$x + ($align - 1) & !($align - 1)
};
}
#[derive(Debug, PartialEq, Eq)]
pub enum ErasureError {
NotEnoughBlocksToDecode,
DecodeError,
EncodeError,
InvalidBlockSize,
InvalidBlobData,
}
// k = number of data devices
// m = number of coding devices
// w = word size
extern "C" {
fn jerasure_matrix_encode(
k: i32,
m: i32,
w: i32,
matrix: *const i32,
data_ptrs: *const *const u8,
coding_ptrs: *const *mut u8,
size: i32,
);
fn jerasure_matrix_decode(
k: i32,
m: i32,
w: i32,
matrix: *const i32,
row_k_ones: i32,
erasures: *const i32,
data_ptrs: *const *mut u8,
coding_ptrs: *const *mut u8,
size: i32,
) -> i32;
fn galois_single_divide(a: i32, b: i32, w: i32) -> i32;
}
fn get_matrix(m: i32, k: i32, w: i32) -> Vec<i32> {
let mut matrix = vec![0; (m * k) as usize];
for i in 0..m {
for j in 0..k {
unsafe {
matrix[(i * k + j) as usize] = galois_single_divide(1, i ^ (m + j), w);
}
}
}
matrix
}
pub const ERASURE_W: i32 = 32;
// Generate coding blocks into coding
// There are some alignment restrictions, blocks should be aligned by 16 bytes
// which means their size should be >= 16 bytes
pub fn generate_coding_blocks(coding: &mut [&mut [u8]], data: &[&[u8]]) -> Result<()> {
if data.is_empty() {
return Ok(());
}
let k = data.len() as i32;
let m = coding.len() as i32;
let block_len = data[0].len() as i32;
let matrix: Vec<i32> = get_matrix(m, k, ERASURE_W);
let mut data_arg = Vec::with_capacity(data.len());
for block in data {
if block_len != block.len() as i32 {
error!(
"data block size incorrect {} expected {}",
block.len(),
block_len
);
return Err(Error::ErasureError(ErasureError::InvalidBlockSize));
}
data_arg.push(block.as_ptr());
}
let mut coding_arg = Vec::with_capacity(coding.len());
for mut block in coding {
if block_len != block.len() as i32 {
error!(
"coding block size incorrect {} expected {}",
block.len(),
block_len
);
return Err(Error::ErasureError(ErasureError::InvalidBlockSize));
}
coding_arg.push(block.as_mut_ptr());
}
unsafe {
jerasure_matrix_encode(
k,
m,
ERASURE_W,
matrix.as_ptr(),
data_arg.as_ptr(),
coding_arg.as_ptr(),
block_len,
);
}
Ok(())
}
// Recover data + coding blocks into data blocks
// data: array of blocks to recover into
// coding: arry of coding blocks
// erasures: list of indices in data where blocks should be recovered
pub fn decode_blocks(
data: &mut [&mut [u8]],
coding: &mut [&mut [u8]],
erasures: &[i32],
) -> Result<()> {
if data.is_empty() {
return Ok(());
}
let block_len = data[0].len();
let matrix: Vec<i32> = get_matrix(coding.len() as i32, data.len() as i32, ERASURE_W);
// generate coding pointers, blocks should be the same size
let mut coding_arg: Vec<*mut u8> = Vec::new();
for x in coding.iter_mut() {
if x.len() != block_len {
return Err(Error::ErasureError(ErasureError::InvalidBlockSize));
}
coding_arg.push(x.as_mut_ptr());
}
// generate data pointers, blocks should be the same size
let mut data_arg: Vec<*mut u8> = Vec::new();
for x in data.iter_mut() {
if x.len() != block_len {
return Err(Error::ErasureError(ErasureError::InvalidBlockSize));
}
data_arg.push(x.as_mut_ptr());
}
let ret = unsafe {
jerasure_matrix_decode(
data.len() as i32,
coding.len() as i32,
ERASURE_W,
matrix.as_ptr(),
0,
erasures.as_ptr(),
data_arg.as_ptr(),
coding_arg.as_ptr(),
data[0].len() as i32,
)
};
trace!("jerasure_matrix_decode ret: {}", ret);
for x in data[erasures[0] as usize][0..8].iter() {
trace!("{} ", x)
}
trace!("");
if ret < 0 {
return Err(Error::ErasureError(ErasureError::DecodeError));
}
Ok(())
}
// Generate coding blocks in window starting from start_idx,
// for num_blobs.. For each block place the coding blobs
// at the end of the block like so:
//
// block-size part of a Window, with each element a WindowSlot..
// |<======================= NUM_DATA ==============================>|
// |<==== NUM_CODING ===>|
// +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+
// | D | | D | | D | | D | | D | | D | | D | | D | | D | | D |
// +---+ +---+ +---+ +---+ +---+ . . . +---+ +---+ +---+ +---+ +---+
// | | | | | | | | | | | | | C | | C | | C | | C |
// +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+
//
// blob structure for coding, recover
//
// + ------- meta is set and used by transport, meta.size is actual length
// | of data in the byte array blob.data
// |
// | + -- data is stuff shipped over the wire, and has an included
// | | header
// V V
// +----------+------------------------------------------------------------+
// | meta | data |
// |+---+-- |+---+---+---+---+------------------------------------------+|
// || s | . || i | | f | s | ||
// || i | . || n | i | l | i | ||
// || z | . || d | d | a | z | blob.data(), or blob.data_mut() ||
// || e | || e | | g | e | ||
// |+---+-- || x | | s | | ||
// | |+---+---+---+---+------------------------------------------+|
// +----------+------------------------------------------------------------+
// | |<=== coding blob part for "coding" =======>|
// | |
// |<============== data blob part for "coding" ==============>|
//
//
//
pub fn generate_coding(
id: &Pubkey,
window: &mut [WindowSlot],
receive_index: u64,
num_blobs: usize,
transmit_index_coding: &mut u64,
) -> Result<()> {
// beginning of the coding blobs of the block that receive_index points into
let coding_index_start =
receive_index - (receive_index % NUM_DATA as u64) + (NUM_DATA - NUM_CODING) as u64;
let start_idx = receive_index as usize % window.len();
let mut block_start = start_idx - (start_idx % NUM_DATA);
loop {
let block_end = block_start + NUM_DATA;
if block_end > (start_idx + num_blobs) {
break;
}
info!(
"generate_coding {} start: {} end: {} start_idx: {} num_blobs: {}",
id, block_start, block_end, start_idx, num_blobs
);
let mut max_data_size = 0;
// find max_data_size, maybe bail if not all the data is here
for i in block_start..block_end {
let n = i % window.len();
trace!("{} window[{}] = {:?}", id, n, window[n].data);
if let Some(b) = &window[n].data {
max_data_size = cmp::max(b.read().unwrap().meta.size, max_data_size);
} else {
trace!("{} data block is null @ {}", id, n);
return Ok(());
}
}
// round up to the nearest jerasure alignment
max_data_size = align!(max_data_size, JERASURE_ALIGN);
let mut data_blobs = Vec::with_capacity(NUM_DATA);
for i in block_start..block_end {
let n = i % window.len();
if let Some(b) = &window[n].data {
// make sure extra bytes in each blob are zero-d out for generation of
// coding blobs
let mut b_wl = b.write().unwrap();
for i in b_wl.meta.size..max_data_size {
b_wl.data[i] = 0;
}
data_blobs.push(b);
}
}
// getting ready to do erasure coding, means that we're potentially
// going back in time, tell our caller we've inserted coding blocks
// starting at coding_index_start
*transmit_index_coding = cmp::min(*transmit_index_coding, coding_index_start);
let mut coding_blobs = Vec::with_capacity(NUM_CODING);
let coding_start = block_end - NUM_CODING;
for i in coding_start..block_end {
let n = i % window.len();
assert!(window[n].coding.is_none());
window[n].coding = Some(SharedBlob::default());
let coding = window[n].coding.clone().unwrap();
let mut coding_wl = coding.write().unwrap();
for i in 0..max_data_size {
coding_wl.data[i] = 0;
}
// copy index and id from the data blob
if let Some(data) = &window[n].data {
let data_rl = data.read().unwrap();
let index = data_rl.index().unwrap();
let slot = data_rl.slot().unwrap();
let id = data_rl.id().unwrap();
trace!(
"{} copying index {} id {:?} from data to coding",
id,
index,
id
);
coding_wl.set_index(index).unwrap();
coding_wl.set_slot(slot).unwrap();
coding_wl.set_id(&id).unwrap();
}
coding_wl.set_size(max_data_size);
if coding_wl.set_coding().is_err() {
return Err(Error::ErasureError(ErasureError::EncodeError));
}
coding_blobs.push(coding.clone());
}
let data_locks: Vec<_> = data_blobs.iter().map(|b| b.read().unwrap()).collect();
let data_ptrs: Vec<_> = data_locks
.iter()
.enumerate()
.map(|(i, l)| {
trace!("{} i: {} data: {}", id, i, l.data[0]);
&l.data[..max_data_size]
})
.collect();
let mut coding_locks: Vec<_> = coding_blobs.iter().map(|b| b.write().unwrap()).collect();
let mut coding_ptrs: Vec<_> = coding_locks
.iter_mut()
.enumerate()
.map(|(i, l)| {
trace!("{} i: {} coding: {}", id, i, l.data[0],);
&mut l.data_mut()[..max_data_size]
})
.collect();
generate_coding_blocks(coding_ptrs.as_mut_slice(), &data_ptrs)?;
debug!(
"{} start_idx: {} data: {}:{} coding: {}:{}",
id, start_idx, block_start, block_end, coding_start, block_end
);
block_start = block_end;
}
Ok(())
}
// Recover the missing data and coding blobs from the input ledger. Returns a vector
// of the recovered missing data blobs and a vector of the recovered coding blobs
pub fn recover(
db_ledger: &mut DbLedger,
slot: u64,
start_idx: u64,
) -> Result<(Vec<SharedBlob>, Vec<SharedBlob>)> {
let block_start_idx = start_idx - (start_idx % NUM_DATA as u64);
debug!("block_start_idx: {}", block_start_idx);
let coding_start_idx = block_start_idx + NUM_DATA as u64 - NUM_CODING as u64;
let block_end_idx = block_start_idx + NUM_DATA as u64;
trace!(
"recover: coding_start_idx: {} block_end_idx: {}",
coding_start_idx,
block_end_idx
);
let data_missing =
find_missing_data_indexes(slot, db_ledger, block_start_idx, block_end_idx, NUM_DATA).len();
let coding_missing =
find_missing_coding_indexes(slot, db_ledger, coding_start_idx, block_end_idx, NUM_CODING)
.len();
// if we're not missing data, or if we have too much missing but have enough coding
if data_missing == 0 {
// nothing to do...
return Ok((vec![], vec![]));
}
if (data_missing + coding_missing) > NUM_CODING {
trace!(
"recover: start: {} skipping recovery data: {} coding: {}",
block_start_idx,
data_missing,
coding_missing
);
// nothing to do...
return Err(Error::ErasureError(ErasureError::NotEnoughBlocksToDecode));
}
trace!(
"recover: recovering: data: {} coding: {}",
data_missing,
coding_missing
);
let mut blobs: Vec<SharedBlob> = Vec::with_capacity(NUM_DATA + NUM_CODING);
let mut erasures: Vec<i32> = Vec::with_capacity(NUM_CODING);
let mut missing_data: Vec<SharedBlob> = vec![];
let mut missing_coding: Vec<SharedBlob> = vec![];
let mut size = None;
// Add the data blobs we have into the recovery vector, mark the missing ones
for i in block_start_idx..block_end_idx {
let result = db_ledger
.data_cf
.get_by_slot_index(&db_ledger.db, slot, i)?;
categorize_blob(
&result,
&mut blobs,
&mut missing_data,
&mut erasures,
(i - block_start_idx) as i32,
)?;
}
// Add the coding blobs we have into the recovery vector, mark the missing ones
for i in coding_start_idx..block_end_idx {
let result = db_ledger
.erasure_cf
.get_by_slot_index(&db_ledger.db, slot, i)?;
categorize_blob(
&result,
&mut blobs,
&mut missing_coding,
&mut erasures,
((i - coding_start_idx) + NUM_DATA as u64) as i32,
)?;
if let Some(b) = result {
if size.is_none() {
size = Some(b.len() - BLOB_HEADER_SIZE);
}
}
}
// Due to check (data_missing + coding_missing) > NUM_CODING from earlier in this function,
// we know at least one coding block must exist, so "size" will not remain None after the
// below processing.
let size = size.unwrap();
// marks end of erasures
erasures.push(-1);
trace!("erasures[]:{:?} data_size: {}", erasures, size,);
let mut locks = Vec::with_capacity(NUM_DATA + NUM_CODING);
{
let mut coding_ptrs: Vec<&mut [u8]> = Vec::with_capacity(NUM_CODING);
let mut data_ptrs: Vec<&mut [u8]> = Vec::with_capacity(NUM_DATA);
for b in &blobs {
locks.push(b.write().unwrap());
}
for (i, l) in locks.iter_mut().enumerate() {
if i < NUM_DATA {
data_ptrs.push(&mut l.data[..size]);
} else {
coding_ptrs.push(&mut l.data_mut()[..size]);
}
}
// Decode the blocks
decode_blocks(
data_ptrs.as_mut_slice(),
coding_ptrs.as_mut_slice(),
&erasures,
)?;
}
// Create the missing blobs from the reconstructed data
let mut corrupt = false;
for i in &erasures[..erasures.len() - 1] {
let n = *i as usize;
let mut idx = n as u64 + block_start_idx;
let mut data_size;
if n < NUM_DATA {
data_size = locks[n].data_size().unwrap() as usize;
data_size -= BLOB_HEADER_SIZE;
if data_size > BLOB_DATA_SIZE {
error!("corrupt data blob[{}] data_size: {}", idx, data_size);
corrupt = true;
break;
}
} else {
data_size = size;
idx -= NUM_CODING as u64;
locks[n].set_slot(slot).unwrap();
locks[n].set_index(idx).unwrap();
if data_size - BLOB_HEADER_SIZE > BLOB_DATA_SIZE {
error!("corrupt coding blob[{}] data_size: {}", idx, data_size);
corrupt = true;
break;
}
}
locks[n].set_size(data_size);
trace!(
"erasures[{}] ({}) size: {} data[0]: {}",
*i,
idx,
data_size,
locks[n].data()[0]
);
}
if corrupt {
// Remove the corrupted coding blobs so there's no effort wasted in trying to reconstruct
// the blobs again
for i in coding_start_idx..block_end_idx {
db_ledger
.erasure_cf
.delete_by_slot_index(&db_ledger.db, slot, i)?;
}
return Ok((vec![], vec![]));
}
Ok((missing_data, missing_coding))
}
fn categorize_blob(
get_blob_result: &Option<Vec<u8>>,
blobs: &mut Vec<SharedBlob>,
missing: &mut Vec<SharedBlob>,
erasures: &mut Vec<i32>,
erasure_index: i32,
) -> Result<()> {
match get_blob_result {
Some(b) => {
if b.len() <= BLOB_HEADER_SIZE || b.len() > BLOB_SIZE {
return Err(Error::ErasureError(ErasureError::InvalidBlobData));
}
blobs.push(Arc::new(RwLock::new(Blob::new(&b))));
}
None => {
// Mark the missing memory
erasures.push(erasure_index);
let b = SharedBlob::default();
blobs.push(b.clone());
missing.push(b);
}
}
Ok(())
}
#[cfg(test)]
pub mod test {
use super::*;
use db_ledger::{DbLedger, DEFAULT_SLOT_HEIGHT};
use ledger::{get_tmp_ledger_path, make_tiny_test_entries, Block};
use logger;
use packet::{index_blobs, SharedBlob, BLOB_DATA_SIZE, BLOB_SIZE};
use rand::{thread_rng, Rng};
use solana_sdk::pubkey::Pubkey;
use solana_sdk::signature::{Keypair, KeypairUtil};
use window::WindowSlot;
#[test]
pub fn test_coding() {
let zero_vec = vec![0; 16];
let mut vs: Vec<Vec<u8>> = (0..4).map(|i| (i..(16 + i)).collect()).collect();
let v_orig: Vec<u8> = vs[0].clone();
let m = 2;
let mut coding_blocks: Vec<_> = (0..m).map(|_| vec![0u8; 16]).collect();
{
let mut coding_blocks_slices: Vec<_> =
coding_blocks.iter_mut().map(|x| x.as_mut_slice()).collect();
let v_slices: Vec<_> = vs.iter().map(|x| x.as_slice()).collect();
assert!(generate_coding_blocks(
coding_blocks_slices.as_mut_slice(),
v_slices.as_slice(),
)
.is_ok());
}
trace!("coding blocks:");
for b in &coding_blocks {
trace!("{:?}", b);
}
let erasure: i32 = 1;
let erasures = vec![erasure, -1];
// clear an entry
vs[erasure as usize].copy_from_slice(zero_vec.as_slice());
{
let mut coding_blocks_slices: Vec<_> =
coding_blocks.iter_mut().map(|x| x.as_mut_slice()).collect();
let mut v_slices: Vec<_> = vs.iter_mut().map(|x| x.as_mut_slice()).collect();
assert!(decode_blocks(
v_slices.as_mut_slice(),
coding_blocks_slices.as_mut_slice(),
erasures.as_slice(),
)
.is_ok());
}
trace!("vs:");
for v in &vs {
trace!("{:?}", v);
}
assert_eq!(v_orig, vs[0]);
}
// TODO: Temprorary function used in tests to generate a database ledger
// from the window (which is used to generate the erasure coding)
// until we also transition generate_coding() and BroadcastStage to use RocksDb.
// Github issue: https://github.com/solana-labs/solana/issues/1899.
pub fn generate_db_ledger_from_window(
ledger_path: &str,
window: &[WindowSlot],
slot_height: u64,
use_random: bool,
) -> DbLedger {
let mut db_ledger =
DbLedger::open(ledger_path).expect("Expected to be able to open database ledger");
for slot in window {
if let Some(ref data) = slot.data {
// If we're using gibberish blobs, skip validation checks and insert
// directly into the ledger
if use_random {
let data_l = data.read().unwrap();
db_ledger
.data_cf
.put_by_slot_index(
&db_ledger.db,
slot_height,
data_l.index().unwrap(),
&data_l.data[..data_l.data_size().unwrap() as usize],
)
.expect("Expected successful put into data column of ledger");
} else {
db_ledger
.write_shared_blobs(slot_height, vec![data].into_iter())
.unwrap();
}
}
if let Some(ref coding) = slot.coding {
let coding_lock = coding.read().unwrap();
let index = coding_lock
.index()
.expect("Expected coding blob to have valid index");
let data_size = coding_lock
.size()
.expect("Expected coding blob to have valid ata size");
db_ledger
.erasure_cf
.put_by_slot_index(
&db_ledger.db,
slot_height,
index,
&coding_lock.data[..data_size as usize + BLOB_HEADER_SIZE],
)
.unwrap();
}
}
db_ledger
}
pub fn setup_window_ledger(
offset: usize,
num_blobs: usize,
use_random_window: bool,
slot: u64,
) -> Vec<WindowSlot> {
// Generate a window
let mut window = {
if use_random_window {
generate_window(offset, num_blobs, slot)
} else {
generate_entry_window(offset, num_blobs)
}
};
for slot in &window {
if let Some(blob) = &slot.data {
let blob_r = blob.read().unwrap();
assert!(!blob_r.is_coding());
}
}
// Generate the coding blocks
let mut index = (NUM_DATA + 2) as u64;
assert!(generate_coding(
&Pubkey::default(),
&mut window,
offset as u64,
num_blobs,
&mut index
)
.is_ok());
assert_eq!(index, (NUM_DATA - NUM_CODING) as u64);
// put junk in the tails, simulates re-used blobs
scramble_window_tails(&mut window, num_blobs);
window
}
const WINDOW_SIZE: usize = 64;
fn generate_window(offset: usize, num_blobs: usize, slot: u64) -> Vec<WindowSlot> {
let mut window = vec![
WindowSlot {
data: None,
coding: None,
leader_unknown: false,
};
WINDOW_SIZE
];
let mut blobs = Vec::with_capacity(num_blobs);
for i in 0..num_blobs {
let b = SharedBlob::default();
let b_ = b.clone();
let mut w = b.write().unwrap();
// generate a random length, multiple of 4 between 8 and 32
let data_len = if i == 3 {
BLOB_DATA_SIZE
} else {
(thread_rng().gen_range(2, 8) * 4) + 1
};
eprintln!("data_len of {} is {}", i, data_len);
w.set_size(data_len);
for k in 0..data_len {
w.data_mut()[k] = (k + i) as u8;
}
// overfill, simulates re-used blobs
for i in BLOB_HEADER_SIZE + data_len..BLOB_SIZE {
w.data[i] = thread_rng().gen();
}
blobs.push(b_);
}
index_blobs(&blobs, &Keypair::new().pubkey(), offset as u64, slot);
for b in blobs {
let idx = b.read().unwrap().index().unwrap() as usize % WINDOW_SIZE;
window[idx].data = Some(b);
}
window
}
fn generate_entry_window(offset: usize, num_blobs: usize) -> Vec<WindowSlot> {
let mut window = vec![
WindowSlot {
data: None,
coding: None,
leader_unknown: false,
};
WINDOW_SIZE
];
let entries = make_tiny_test_entries(num_blobs);
let blobs = entries.to_blobs();
index_blobs(&blobs, &Keypair::new().pubkey(), offset as u64, 13);
for b in blobs.into_iter() {
let idx = b.read().unwrap().index().unwrap() as usize % WINDOW_SIZE;
window[idx].data = Some(b);
}
window
}
fn scramble_window_tails(window: &mut [WindowSlot], num_blobs: usize) {
for i in 0..num_blobs {
if let Some(b) = &window[i].data {
let size = {
let b_l = b.read().unwrap();
b_l.meta.size
} as usize;
let mut b_l = b.write().unwrap();
for i in size..BLOB_SIZE {
b_l.data[i] = thread_rng().gen();
}
}
}
}
// Remove a data block, test for successful recovery
#[test]
pub fn test_window_recover_basic() {
logger::setup();
// Setup the window
let offset = 0;
let num_blobs = NUM_DATA + 2;
let mut window = setup_window_ledger(offset, num_blobs, true, DEFAULT_SLOT_HEIGHT);
println!("** whack data block:");
// Test erasing a data block
let erase_offset = offset % window.len();
// Create a hole in the window
let refwindow = window[erase_offset].data.clone();
window[erase_offset].data = None;
// Generate the db_ledger from the window
let ledger_path = get_tmp_ledger_path("test_window_recover_basic");
let mut db_ledger =
generate_db_ledger_from_window(&ledger_path, &window, DEFAULT_SLOT_HEIGHT, true);
// Recover it from coding
let (recovered_data, recovered_coding) = recover(&mut db_ledger, 0, offset as u64)
.expect("Expected successful recovery of erased blobs");
assert!(recovered_coding.is_empty());
{
// Check the result, block is here to drop locks
let recovered_blob = recovered_data
.first()
.expect("Expected recovered data blob to exist");
let ref_l = refwindow.clone().unwrap();
let ref_l2 = ref_l.read().unwrap();
let result = recovered_blob.read().unwrap();
assert_eq!(result.size().unwrap(), ref_l2.size().unwrap());
assert_eq!(
result.data[..ref_l2.data_size().unwrap() as usize],
ref_l2.data[..ref_l2.data_size().unwrap() as usize]
);
assert_eq!(result.index().unwrap(), offset as u64);
assert_eq!(result.slot().unwrap(), DEFAULT_SLOT_HEIGHT as u64);
}
drop(db_ledger);
DbLedger::destroy(&ledger_path)
.expect("Expected successful destruction of database ledger");
}
// Remove a data and coding block, test for successful recovery
#[test]
pub fn test_window_recover_basic2() {
logger::setup();
// Setup the window
let offset = 0;
let num_blobs = NUM_DATA + 2;
let mut window = setup_window_ledger(offset, num_blobs, true, DEFAULT_SLOT_HEIGHT);
println!("** whack coding block and data block");
// Tests erasing a coding block and a data block
let coding_start = offset - (offset % NUM_DATA) + (NUM_DATA - NUM_CODING);
let erase_offset = coding_start % window.len();
// Create a hole in the window
let refwindowdata = window[erase_offset].data.clone();
let refwindowcoding = window[erase_offset].coding.clone();
window[erase_offset].data = None;
window[erase_offset].coding = None;
let ledger_path = get_tmp_ledger_path("test_window_recover_basic2");
let mut db_ledger =
generate_db_ledger_from_window(&ledger_path, &window, DEFAULT_SLOT_HEIGHT, true);
// Recover it from coding
let (recovered_data, recovered_coding) = recover(&mut db_ledger, 0, offset as u64)
.expect("Expected successful recovery of erased blobs");
{
let recovered_data_blob = recovered_data
.first()
.expect("Expected recovered data blob to exist");
let recovered_coding_blob = recovered_coding
.first()
.expect("Expected recovered coding blob to exist");
// Check the recovered data result
let ref_l = refwindowdata.clone().unwrap();
let ref_l2 = ref_l.read().unwrap();
let result = recovered_data_blob.read().unwrap();
assert_eq!(result.size().unwrap(), ref_l2.size().unwrap());
assert_eq!(
result.data[..ref_l2.data_size().unwrap() as usize],
ref_l2.data[..ref_l2.data_size().unwrap() as usize]
);
assert_eq!(result.index().unwrap(), coding_start as u64);
assert_eq!(result.slot().unwrap(), DEFAULT_SLOT_HEIGHT as u64);
// Check the recovered erasure result
let ref_l = refwindowcoding.clone().unwrap();
let ref_l2 = ref_l.read().unwrap();
let result = recovered_coding_blob.read().unwrap();
assert_eq!(result.size().unwrap(), ref_l2.size().unwrap());
assert_eq!(
result.data()[..ref_l2.size().unwrap() as usize],
ref_l2.data()[..ref_l2.size().unwrap() as usize]
);
assert_eq!(result.index().unwrap(), coding_start as u64);
assert_eq!(result.slot().unwrap(), DEFAULT_SLOT_HEIGHT as u64);
}
drop(db_ledger);
DbLedger::destroy(&ledger_path)
.expect("Expected successful destruction of database ledger");
}
// //TODO This needs to be reworked
// #[test]
// #[ignore]
// pub fn test_window_recover() {
// logger::setup();
// let offset = 4;
// let data_len = 16;
// let num_blobs = NUM_DATA + 2;
// let (mut window, blobs_len) = generate_window(data_len, offset, num_blobs);
// println!("** after-gen:");
// print_window(&window);
// assert!(generate_coding(&mut window, offset, blobs_len).is_ok());
// println!("** after-coding:");
// print_window(&window);
// let refwindow = window[offset + 1].clone();
// window[offset + 1] = None;
// window[offset + 2] = None;
// window[offset + SET_SIZE + 3] = None;
// window[offset + (2 * SET_SIZE) + 0] = None;
// window[offset + (2 * SET_SIZE) + 1] = None;
// window[offset + (2 * SET_SIZE) + 2] = None;
// let window_l0 = &(window[offset + (3 * SET_SIZE)]).clone().unwrap();
// window_l0.write().unwrap().data[0] = 55;
// println!("** after-nulling:");
// print_window(&window);
// assert!(recover(&mut window, offset, offset + blobs_len).is_ok());
// println!("** after-restore:");
// print_window(&window);
// let window_l = window[offset + 1].clone().unwrap();
// let ref_l = refwindow.clone().unwrap();
// assert_eq!(
// window_l.read().unwrap().data()[..data_len],
// ref_l.read().unwrap().data()[..data_len]
// );
// }
}
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