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uses enum for shred type (backport #21333) (#22147)

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* uses enum for shred type

Current code is using u8 which does not have any type-safety and can
contain invalid values:
https://github.com/solana-labs/solana/blob/66fa062f1/ledger/src/shred.rs#L167

Checks for invalid shred-types are scattered through the code:
https://github.com/solana-labs/solana/blob/66fa062f1/ledger/src/blockstore.rs#L849-L851
https://github.com/solana-labs/solana/blob/66fa062f1/ledger/src/shred.rs#L346-L348

The commit uses enum for shred type with #[repr(u8)]. Backward
compatibility is maintained by implementing Serialize and Deserialize
compatible with u8, and adding a test to assert that.

(cherry picked from commit 57057f8d39)

# Conflicts:
#	core/src/retransmit_stage.rs
#	gossip/src/cluster_info.rs
#	ledger/Cargo.toml
#	ledger/src/blockstore.rs
#	ledger/src/shred.rs

* changes Blockstore::is_shred_duplicate arg type to ShredType

(cherry picked from commit 48dfdfb4d5)

# Conflicts:
#	ledger/src/blockstore.rs

* removes backport merge conflicts

Co-authored-by: behzad nouri <behzadnouri@gmail.com>
This commit is contained in:
mergify[bot]
2021-12-31 16:47:45 +00:00
committed by GitHub
parent ec970f9d69
commit a53dd611c0
8 changed files with 204 additions and 159 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
Cargo.lock generated
View File

@ -4996,6 +4996,8 @@ dependencies = [
"libc",
"log 0.4.14",
"matches",
"num-derive",
"num-traits",
"num_cpus",
"prost",
"rand 0.7.3",

10
core/src/retransmit_stage.rs
View File

@ -18,7 +18,9 @@ use {
solana_client::rpc_response::SlotUpdate,
solana_gossip::cluster_info::{ClusterInfo, DATA_PLANE_FANOUT},
solana_ledger::{
blockstore::Blockstore, leader_schedule_cache::LeaderScheduleCache, shred::Shred,
blockstore::Blockstore,
leader_schedule_cache::LeaderScheduleCache,
shred::{Shred, ShredType},
},
solana_measure::measure::Measure,
solana_perf::packet::PacketBatch,
@ -137,14 +139,14 @@ impl RetransmitStats {
}
}
// Map of shred (slot, index, is_data) => list of hash values seen for that key.
type ShredFilter = LruCache<(Slot, u32, bool), Vec<u64>>;
// Map of shred (slot, index, type) => list of hash values seen for that key.
type ShredFilter = LruCache<(Slot, u32, ShredType), Vec<u64>>;
type ShredFilterAndHasher = (ShredFilter, PacketHasher);
// Returns true if shred is already received and should skip retransmit.
fn should_skip_retransmit(shred: &Shred, shreds_received: &Mutex<ShredFilterAndHasher>) -> bool {
let key = (shred.slot(), shred.index(), shred.is_data());
let key = (shred.slot(), shred.index(), shred.shred_type());
let mut shreds_received = shreds_received.lock().unwrap();
let (cache, hasher) = shreds_received.deref_mut();
match cache.get_mut(&key) {

13
core/src/window_service.rs
View File

@ -18,7 +18,7 @@ use {
solana_ledger::{
blockstore::{self, Blockstore, BlockstoreInsertionMetrics, MAX_DATA_SHREDS_PER_SLOT},
leader_schedule_cache::LeaderScheduleCache,
shred::{Nonce, Shred},
shred::{Nonce, Shred, ShredType},
},
solana_measure::measure::Measure,
solana_metrics::{inc_new_counter_debug, inc_new_counter_error},
@ -161,12 +161,11 @@ impl ReceiveWindowStats {
}
fn verify_shred_slot(shred: &Shred, root: u64) -> bool {
if shred.is_data() {
match shred.shred_type() {
// Only data shreds have parent information
blockstore::verify_shred_slots(shred.slot(), shred.parent(), root)
} else {
ShredType::Data => blockstore::verify_shred_slots(shred.slot(), shred.parent(), root),
// Filter out outdated coding shreds
shred.slot() >= root
ShredType::Code => shred.slot() >= root,
}
}
@ -218,8 +217,8 @@ fn run_check_duplicate(
if let Some(existing_shred_payload) = blockstore.is_shred_duplicate(
shred_slot,
shred.index(),
&shred.payload,
shred.is_data(),
shred.payload.clone(),
shred.shred_type(),
) {
cluster_info.push_duplicate_shred(&shred, &existing_shred_payload)?;
blockstore.store_duplicate_slot(

2
gossip/src/cluster_info.rs
View File

@ -257,7 +257,7 @@ pub fn make_accounts_hashes_message(
pub(crate) type Ping = ping_pong::Ping<[u8; GOSSIP_PING_TOKEN_SIZE]>;
// TODO These messages should go through the gpu pipeline for spam filtering
#[frozen_abi(digest = "D2ebKKmm6EQ8JJjYc3xUpzpBTJguqgEzShhj9fiUcP6F")]
#[frozen_abi(digest = "7cgH6JHdpxMSuPs6LEZzV5ShLXQMcZftb95s5PZKR5qB")]
#[derive(Serialize, Deserialize, Debug, AbiEnumVisitor, AbiExample)]
#[allow(clippy::large_enum_variant)]
pub(crate) enum Protocol {

17
gossip/src/duplicate_shred.rs
View File

@ -89,7 +89,7 @@ fn check_shreds(
// TODO: Should also allow two coding shreds with different indices but
// same fec-set-index and mismatching erasure-config.
Err(Error::ShredIndexMismatch)
} else if shred1.common_header.shred_type != shred2.common_header.shred_type {
} else if shred1.shred_type() != shred2.shred_type() {
Err(Error::ShredTypeMismatch)
} else if shred1.payload == shred2.payload {
Err(Error::InvalidDuplicateShreds)
@ -119,11 +119,7 @@ pub fn from_duplicate_slot_proof(
let shred1 = Shred::new_from_serialized_shred(proof.shred1.clone())?;
let shred2 = Shred::new_from_serialized_shred(proof.shred2.clone())?;
check_shreds(leader_schedule, &shred1, &shred2)?;
let (slot, shred_index, shred_type) = (
shred1.slot(),
shred1.index(),
shred1.common_header.shred_type,
);
let (slot, shred_index, shred_type) = (shred1.slot(), shred1.index(), shred1.shred_type());
let data = bincode::serialize(proof)?;
let chunk_size = if DUPLICATE_SHRED_HEADER_SIZE < max_size {
max_size - DUPLICATE_SHRED_HEADER_SIZE
@ -161,8 +157,7 @@ pub(crate) fn from_shred(
}
let other_shred = Shred::new_from_serialized_shred(other_payload.clone())?;
check_shreds(leader_schedule, &shred, &other_shred)?;
let (slot, shred_index, shred_type) =
(shred.slot(), shred.index(), shred.common_header.shred_type);
let (slot, shred_index, shred_type) = (shred.slot(), shred.index(), shred.shred_type());
let proof = DuplicateSlotProof {
shred1: shred.payload,
shred2: other_payload,
@ -262,9 +257,7 @@ pub fn into_shreds(
Err(Error::SlotMismatch)
} else if shred1.index() != shred_index || shred2.index() != shred_index {
Err(Error::ShredIndexMismatch)
} else if shred1.common_header.shred_type != shred_type
|| shred2.common_header.shred_type != shred_type
{
} else if shred1.shred_type() != shred_type || shred2.shred_type() != shred_type {
Err(Error::ShredTypeMismatch)
} else if shred1.payload == shred2.payload {
Err(Error::InvalidDuplicateShreds)
@ -306,7 +299,7 @@ pub(crate) mod tests {
wallclock: u64::MAX,
slot: Slot::MAX,
shred_index: u32::MAX,
shred_type: ShredType(u8::MAX),
shred_type: ShredType::Data,
num_chunks: u8::MAX,
chunk_index: u8::MAX,
chunk: Vec::default(),

2
ledger/Cargo.toml
View File

@ -25,6 +25,8 @@ itertools = "0.9.0"
lazy_static = "1.4.0"
libc = "0.2.81"
log = { version = "0.4.11" }
num-derive = "0.3"
num-traits = "0.2"
num_cpus = "1.13.0"
prost = "0.8.0"
rand = "0.7.0"

145
ledger/src/blockstore.rs
View File

@ -14,7 +14,10 @@ use {
erasure::ErasureConfig,
leader_schedule_cache::LeaderScheduleCache,
next_slots_iterator::NextSlotsIterator,
shred::{Result as ShredResult, Shred, Shredder, MAX_DATA_SHREDS_PER_FEC_BLOCK},
shred::{
Result as ShredResult, Shred, ShredType, Shredder, MAX_DATA_SHREDS_PER_FEC_BLOCK,
SHRED_PAYLOAD_SIZE,
},
},
bincode::deserialize,
log::*,
@ -827,51 +830,54 @@ impl Blockstore {
let mut newly_completed_data_sets: Vec<CompletedDataSetInfo> = vec![];
let mut inserted_indices = Vec::new();
for (i, (shred, is_repaired)) in shreds.into_iter().zip(is_repaired).enumerate() {
if shred.is_data() {
let shred_source = if is_repaired {
ShredSource::Repaired
} else {
ShredSource::Turbine
};
match self.check_insert_data_shred(
shred,
&mut erasure_metas,
&mut index_working_set,
&mut slot_meta_working_set,
&mut write_batch,
&mut just_inserted_data_shreds,
&mut index_meta_time,
is_trusted,
handle_duplicate,
leader_schedule,
shred_source,
) {
Err(InsertDataShredError::Exists) => metrics.num_data_shreds_exists += 1,
Err(InsertDataShredError::InvalidShred) => metrics.num_data_shreds_invalid += 1,
Err(InsertDataShredError::BlockstoreError(_)) => {
metrics.num_data_shreds_blockstore_error += 1;
}
Ok(completed_data_sets) => {
newly_completed_data_sets.extend(completed_data_sets);
inserted_indices.push(i);
metrics.num_inserted += 1;
}
};
} else if shred.is_code() {
self.check_cache_coding_shred(
shred,
&mut erasure_metas,
&mut index_working_set,
&mut just_inserted_coding_shreds,
&mut index_meta_time,
handle_duplicate,
is_trusted,
is_repaired,
metrics,
);
} else {
panic!("There should be no other case");
}
match shred.shred_type() {
ShredType::Data => {
let shred_source = if is_repaired {
ShredSource::Repaired
} else {
ShredSource::Turbine
};
match self.check_insert_data_shred(
shred,
&mut erasure_metas,
&mut index_working_set,
&mut slot_meta_working_set,
&mut write_batch,
&mut just_inserted_data_shreds,
&mut index_meta_time,
is_trusted,
handle_duplicate,
leader_schedule,
shred_source,
) {
Err(InsertDataShredError::Exists) => metrics.num_data_shreds_exists += 1,
Err(InsertDataShredError::InvalidShred) => {
metrics.num_data_shreds_invalid += 1
}
Err(InsertDataShredError::BlockstoreError(_)) => {
metrics.num_data_shreds_blockstore_error += 1;
}
Ok(completed_data_sets) => {
newly_completed_data_sets.extend(completed_data_sets);
inserted_indices.push(i);
metrics.num_inserted += 1;
}
};
}
ShredType::Code => {
self.check_cache_coding_shred(
shred,
&mut erasure_metas,
&mut index_working_set,
&mut just_inserted_coding_shreds,
&mut index_meta_time,
handle_duplicate,
is_trusted,
is_repaired,
metrics,
);
}
};
}
start.stop();
@ -1345,7 +1351,6 @@ impl Blockstore {
leader_schedule: Option<&LeaderScheduleCache>,
shred_source: ShredSource,
) -> bool {
use crate::shred::SHRED_PAYLOAD_SIZE;
let shred_index = u64::from(shred.index());
let slot = shred.slot();
let last_in_slot = if shred.last_in_slot() {
@ -1574,7 +1579,6 @@ impl Blockstore {
}
pub fn get_data_shred(&self, slot: Slot, index: u64) -> Result<Option<Vec<u8>>> {
use crate::shred::SHRED_PAYLOAD_SIZE;
self.data_shred_cf.get_bytes((slot, index)).map(|data| {
data.map(|mut d| {
// Only data_header.size bytes stored in the blockstore so
@ -3032,31 +3036,18 @@ impl Blockstore {
&self,
slot: u64,
index: u32,
new_shred_raw: &[u8],
is_data: bool,
mut payload: Vec<u8>,
shred_type: ShredType,
) -> Option<Vec<u8>> {
let res = if is_data {
self.get_data_shred(slot, index as u64)
.expect("fetch from DuplicateSlots column family failed")
} else {
self.get_coding_shred(slot, index as u64)
.expect("fetch from DuplicateSlots column family failed")
};
let mut payload = new_shred_raw.to_vec();
payload.resize(
std::cmp::max(new_shred_raw.len(), crate::shred::SHRED_PAYLOAD_SIZE),
0,
);
let existing_shred = match shred_type {
ShredType::Data => self.get_data_shred(slot, index as u64),
ShredType::Code => self.get_coding_shred(slot, index as u64),
}
.expect("fetch from DuplicateSlots column family failed")?;
let size = payload.len().max(SHRED_PAYLOAD_SIZE);
payload.resize(size, 0u8);
let new_shred = Shred::new_from_serialized_shred(payload).unwrap();
res.map(|existing_shred| {
if existing_shred != new_shred.payload {
Some(existing_shred)
} else {
None
}
})
.unwrap_or(None)
(existing_shred != new_shred.payload).then(|| existing_shred)
}
pub fn has_duplicate_shreds_in_slot(&self, slot: Slot) -> bool {
@ -8228,8 +8219,8 @@ pub mod tests {
blockstore.is_shred_duplicate(
slot,
0,
&duplicate_shred.payload,
duplicate_shred.is_data()
duplicate_shred.payload.clone(),
duplicate_shred.shred_type()
),
Some(shred.payload.to_vec())
);
@ -8237,8 +8228,8 @@ pub mod tests {
.is_shred_duplicate(
slot,
0,
&non_duplicate_shred.payload,
duplicate_shred.is_data()
non_duplicate_shred.payload,
duplicate_shred.shred_type()
)
.is_none());
@ -8726,8 +8717,8 @@ pub mod tests {
.is_shred_duplicate(
slot,
even_smaller_last_shred_duplicate.index(),
&even_smaller_last_shred_duplicate.payload,
true
even_smaller_last_shred_duplicate.payload.clone(),
ShredType::Data,
)
.is_some());
blockstore

172
ledger/src/shred.rs
View File

@ -57,12 +57,14 @@ use {
},
bincode::config::Options,
core::cell::RefCell,
num_derive::FromPrimitive,
num_traits::FromPrimitive,
rayon::{
iter::{IndexedParallelIterator, IntoParallelRefMutIterator, ParallelIterator},
slice::ParallelSlice,
ThreadPool,
},
serde::{Deserialize, Serialize},
serde::{Deserialize, Deserializer, Serialize, Serializer},
solana_measure::measure::Measure,
solana_perf::packet::{limited_deserialize, Packet},
solana_rayon_threadlimit::get_thread_count,
@ -144,10 +146,6 @@ thread_local!(static PAR_THREAD_POOL: RefCell<ThreadPool> = RefCell::new(rayon::
.build()
.unwrap()));
/// The constants that define if a shred is data or coding
pub const DATA_SHRED: u8 = 0b1010_0101;
pub const CODING_SHRED: u8 = 0b0101_1010;
pub const MAX_DATA_SHREDS_PER_FEC_BLOCK: u32 = 32;
pub const SHRED_TICK_REFERENCE_MASK: u8 = 0b0011_1111;
@ -176,11 +174,36 @@ pub enum ShredError {
pub type Result<T> = std::result::Result<T, ShredError>;
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, AbiExample, Deserialize, Serialize)]
pub struct ShredType(pub u8);
#[repr(u8)]
#[derive(Copy, Clone, Debug, Eq, FromPrimitive, Hash, PartialEq, AbiEnumVisitor, AbiExample)]
pub enum ShredType {
Data = 0b1010_0101,
Code = 0b0101_1010,
}
impl Default for ShredType {
fn default() -> Self {
ShredType(DATA_SHRED)
ShredType::Data
}
}
impl Serialize for ShredType {
fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
where
S: Serializer,
{
(*self as u8).serialize(serializer)
}
}
impl<'de> Deserialize<'de> for ShredType {
fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let shred_type = u8::deserialize(deserializer)?;
Self::from_u8(shred_type)
.ok_or_else(|| serde::de::Error::custom(ShredError::InvalidShredType))
}
}
@ -331,32 +354,33 @@ impl Shred {
// so that erasure generation/recovery works correctly
// But only the data_header.size is stored in blockstore.
payload.resize(SHRED_PAYLOAD_SIZE, 0);
let shred = if common_header.shred_type == ShredType(CODING_SHRED) {
let coding_header: CodingShredHeader =
Self::deserialize_obj(&mut start, SIZE_OF_CODING_SHRED_HEADER, &payload)?;
Self {
common_header,
data_header: DataShredHeader::default(),
coding_header,
payload,
let shred = match common_header.shred_type {
ShredType::Code => {
let coding_header: CodingShredHeader =
Self::deserialize_obj(&mut start, SIZE_OF_CODING_SHRED_HEADER, &payload)?;
Self {
common_header,
data_header: DataShredHeader::default(),
coding_header,
payload,
}
}
} else if common_header.shred_type == ShredType(DATA_SHRED) {
let data_header: DataShredHeader =
Self::deserialize_obj(&mut start, SIZE_OF_DATA_SHRED_HEADER, &payload)?;
if u64::from(data_header.parent_offset) > common_header.slot {
return Err(ShredError::InvalidParentOffset {
slot,
parent_offset: data_header.parent_offset,
});
ShredType::Data => {
let data_header: DataShredHeader =
Self::deserialize_obj(&mut start, SIZE_OF_DATA_SHRED_HEADER, &payload)?;
if u64::from(data_header.parent_offset) > common_header.slot {
return Err(ShredError::InvalidParentOffset {
slot,
parent_offset: data_header.parent_offset,
});
}
Self {
common_header,
data_header,
coding_header: CodingShredHeader::default(),
payload,
}
}
Self {
common_header,
data_header,
coding_header: CodingShredHeader::default(),
payload,
}
} else {
return Err(ShredError::InvalidShredType);
};
Ok(shred)
@ -397,23 +421,22 @@ impl Shred {
&common_header,
)
.expect("Failed to write header into shred buffer");
if common_header.shred_type == ShredType(DATA_SHRED) {
Self::serialize_obj_into(
match common_header.shred_type {
ShredType::Data => Self::serialize_obj_into(
&mut start,
SIZE_OF_DATA_SHRED_HEADER,
&mut payload,
&data_header,
)
.expect("Failed to write data header into shred buffer");
} else if common_header.shred_type == ShredType(CODING_SHRED) {
Self::serialize_obj_into(
.expect("Failed to write data header into shred buffer"),
ShredType::Code => Self::serialize_obj_into(
&mut start,
SIZE_OF_CODING_SHRED_HEADER,
&mut payload,
&coding_header,
)
.expect("Failed to write data header into shred buffer");
}
.expect("Failed to write coding header into shred buffer"),
};
Shred {
common_header,
data_header,
@ -434,6 +457,7 @@ impl Shred {
self.common_header.slot
}
// TODO: This should return Option<Slot>
pub fn parent(&self) -> Slot {
if self.is_data() {
self.common_header.slot - u64::from(self.data_header.parent_offset)
@ -491,11 +515,16 @@ impl Shred {
}
}
#[inline]
pub fn shred_type(&self) -> ShredType {
self.common_header.shred_type
}
pub fn is_data(&self) -> bool {
self.common_header.shred_type == ShredType(DATA_SHRED)
self.shred_type() == ShredType::Data
}
pub fn is_code(&self) -> bool {
self.common_header.shred_type == ShredType(CODING_SHRED)
self.shred_type() == ShredType::Code
}
pub fn last_in_slot(&self) -> bool {
@ -769,7 +798,7 @@ impl Shredder {
version: u16,
) -> (ShredCommonHeader, CodingShredHeader) {
let header = ShredCommonHeader {
shred_type: ShredType(CODING_SHRED),
shred_type: ShredType::Code,
index,
slot,
version,
@ -992,7 +1021,7 @@ pub struct ShredFetchStats {
pub fn get_shred_slot_index_type(
p: &Packet,
stats: &mut ShredFetchStats,
) -> Option<(Slot, u32, bool)> {
) -> Option<(Slot, u32, ShredType)> {
let index_start = OFFSET_OF_SHRED_INDEX;
let index_end = index_start + SIZE_OF_SHRED_INDEX;
let slot_start = OFFSET_OF_SHRED_SLOT;
@ -1031,14 +1060,14 @@ pub fn get_shred_slot_index_type(
}
}
let shred_type = p.data[OFFSET_OF_SHRED_TYPE];
if shred_type == DATA_SHRED || shred_type == CODING_SHRED {
return Some((slot, index, shred_type == DATA_SHRED));
} else {
stats.bad_shred_type += 1;
}
None
let shred_type = match ShredType::from_u8(p.data[OFFSET_OF_SHRED_TYPE]) {
None => {
stats.bad_shred_type += 1;
return None;
}
Some(shred_type) => shred_type,
};
Some((slot, index, shred_type))
}
pub fn max_ticks_per_n_shreds(num_shreds: u64, shred_data_size: Option<usize>) -> u64 {
@ -1195,7 +1224,7 @@ pub mod tests {
let mut data_shred_indexes = HashSet::new();
let mut coding_shred_indexes = HashSet::new();
for shred in data_shreds.iter() {
assert_eq!(shred.common_header.shred_type, ShredType(DATA_SHRED));
assert_eq!(shred.shred_type(), ShredType::Data);
let index = shred.common_header.index;
let is_last = index as u64 == num_expected_data_shreds - 1;
verify_test_data_shred(
@ -1214,7 +1243,7 @@ pub mod tests {
for shred in coding_shreds.iter() {
let index = shred.common_header.index;
assert_eq!(shred.common_header.shred_type, ShredType(CODING_SHRED));
assert_eq!(shred.shred_type(), ShredType::Code);
verify_test_code_shred(shred, index, slot, &keypair.pubkey(), true);
assert!(!coding_shred_indexes.contains(&index));
coding_shred_indexes.insert(index);
@ -1816,7 +1845,7 @@ pub mod tests {
shred.copy_to_packet(&mut packet);
let mut stats = ShredFetchStats::default();
let ret = get_shred_slot_index_type(&packet, &mut stats);
assert_eq!(Some((1, 3, true)), ret);
assert_eq!(Some((1, 3, ShredType::Data)), ret);
assert_eq!(stats, ShredFetchStats::default());
packet.meta.size = OFFSET_OF_SHRED_TYPE;
@ -1837,7 +1866,7 @@ pub mod tests {
packet.meta.size = OFFSET_OF_SHRED_INDEX + SIZE_OF_SHRED_INDEX;
assert_eq!(
Some((1, 3, true)),
Some((1, 3, ShredType::Data)),
get_shred_slot_index_type(&packet, &mut stats)
);
assert_eq!(stats.index_overrun, 4);
@ -1853,7 +1882,7 @@ pub mod tests {
);
shred.copy_to_packet(&mut packet);
assert_eq!(
Some((8, 2, false)),
Some((8, 2, ShredType::Code)),
get_shred_slot_index_type(&packet, &mut stats)
);
@ -1862,7 +1891,7 @@ pub mod tests {
assert_eq!(None, get_shred_slot_index_type(&packet, &mut stats));
assert_eq!(1, stats.index_out_of_bounds);
let (mut header, coding_header) = Shredder::new_coding_shred_header(
let (header, coding_header) = Shredder::new_coding_shred_header(
8, // slot
2, // index
10, // fec_set_index
@ -1871,11 +1900,38 @@ pub mod tests {
3, // position
200, // version
);
header.shred_type = ShredType(u8::MAX);
let shred = Shred::new_empty_from_header(header, DataShredHeader::default(), coding_header);
shred.copy_to_packet(&mut packet);
packet.data[OFFSET_OF_SHRED_TYPE] = u8::MAX;
assert_eq!(None, get_shred_slot_index_type(&packet, &mut stats));
assert_eq!(1, stats.bad_shred_type);
}
// Asserts that ShredType is backward compatible with u8.
#[test]
fn test_shred_type_compat() {
assert_eq!(std::mem::size_of::<ShredType>(), std::mem::size_of::<u8>());
assert_eq!(ShredType::from_u8(0), None);
assert_eq!(ShredType::from_u8(1), None);
assert_matches!(bincode::deserialize::<ShredType>(&[0u8]), Err(_));
// data shred
assert_eq!(ShredType::Data as u8, 0b1010_0101);
assert_eq!(ShredType::from_u8(0b1010_0101), Some(ShredType::Data));
let buf = bincode::serialize(&ShredType::Data).unwrap();
assert_eq!(buf, vec![0b1010_0101]);
assert_matches!(
bincode::deserialize::<ShredType>(&[0b1010_0101]),
Ok(ShredType::Data)
);
// coding shred
assert_eq!(ShredType::Code as u8, 0b0101_1010);
assert_eq!(ShredType::from_u8(0b0101_1010), Some(ShredType::Code));
let buf = bincode::serialize(&ShredType::Code).unwrap();
assert_eq!(buf, vec![0b0101_1010]);
assert_matches!(
bincode::deserialize::<ShredType>(&[0b0101_1010]),
Ok(ShredType::Code)
);
}
}