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use crate::metadata::{
EpochEndingBackupMeta, Metadata, StateSnapshotBackupMeta, TransactionBackupMeta,
};
use anyhow::{anyhow, ensure, Result};
use diem_types::transaction::Version;
use itertools::Itertools;
use std::{fmt, str::FromStr};
pub struct MetadataView {
epoch_ending_backups: Vec<EpochEndingBackupMeta>,
state_snapshot_backups: Vec<StateSnapshotBackupMeta>,
transaction_backups: Vec<TransactionBackupMeta>,
}
impl MetadataView {
pub fn get_storage_state(&self) -> BackupStorageState {
let latest_epoch_ending_epoch =
self.epoch_ending_backups.iter().map(|e| e.last_epoch).max();
let latest_state_snapshot_version =
self.state_snapshot_backups.iter().map(|s| s.version).max();
let latest_transaction_version = self
.transaction_backups
.iter()
.map(|t| t.last_version)
.max();
BackupStorageState {
latest_epoch_ending_epoch,
latest_state_snapshot_version,
latest_transaction_version,
}
}
pub fn select_state_snapshot(
&self,
target_version: Version,
) -> Result<Option<StateSnapshotBackupMeta>> {
Ok(self
.state_snapshot_backups
.iter()
.sorted()
.rev()
.find(|m| m.version <= target_version)
.map(Clone::clone))
}
pub fn select_transaction_backups(
&self,
start_version: Version,
target_version: Version,
) -> Result<Vec<TransactionBackupMeta>> {
let mut next_ver = 0;
let mut res = Vec::new();
for backup in self.transaction_backups.iter().sorted() {
if backup.first_version > target_version {
break;
}
ensure!(
backup.first_version == next_ver,
"Transactioon backup ranges not continuous, expecting version {}, got {}.",
next_ver,
backup.first_version,
);
if backup.last_version >= start_version {
res.push(backup.clone());
}
next_ver = backup.last_version + 1;
}
Ok(res)
}
pub fn select_epoch_ending_backups(
&self,
target_version: Version,
) -> Result<Vec<EpochEndingBackupMeta>> {
let mut next_epoch = 0;
let mut res = Vec::new();
for backup in self.epoch_ending_backups.iter().sorted() {
if backup.first_version > target_version {
break;
}
ensure!(
backup.first_epoch == next_epoch,
"Epoch ending backup ranges not continuous, expecting epoch {}, got {}.",
next_epoch,
backup.first_epoch,
);
res.push(backup.clone());
next_epoch = backup.last_epoch + 1;
}
Ok(res)
}
}
impl From<Vec<Metadata>> for MetadataView {
fn from(metadata_vec: Vec<Metadata>) -> Self {
let mut epoch_ending_backups = Vec::new();
let mut state_snapshot_backups = Vec::new();
let mut transaction_backups = Vec::new();
for meta in metadata_vec {
match meta {
Metadata::EpochEndingBackup(e) => epoch_ending_backups.push(e),
Metadata::StateSnapshotBackup(s) => state_snapshot_backups.push(s),
Metadata::TransactionBackup(t) => transaction_backups.push(t),
}
}
Self {
epoch_ending_backups,
state_snapshot_backups,
transaction_backups,
}
}
}
pub struct BackupStorageState {
pub latest_epoch_ending_epoch: Option<u64>,
pub latest_state_snapshot_version: Option<Version>,
pub latest_transaction_version: Option<Version>,
}
impl fmt::Display for BackupStorageState {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"latest_epoch_ending_epoch: {}, latest_state_snapshot_version: {}, latest_transaction_version: {}",
self.latest_epoch_ending_epoch.as_ref().map_or("none".to_string(), u64::to_string),
self.latest_state_snapshot_version.as_ref().map_or("none".to_string(), Version::to_string),
self.latest_transaction_version.as_ref().map_or("none".to_string(), Version::to_string),
)
}
}
trait ParseOptionU64 {
fn parse_option_u64(&self) -> Result<Option<u64>>;
}
impl ParseOptionU64 for Option<regex::Match<'_>> {
fn parse_option_u64(&self) -> Result<Option<u64>> {
let m = self.ok_or_else(|| anyhow!("No match."))?;
if m.as_str() == "none" {
Ok(None)
} else {
Ok(Some(m.as_str().parse()?))
}
}
}
impl FromStr for BackupStorageState {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let captures = regex::Regex::new(
r"latest_epoch_ending_epoch: (none|\d+), latest_state_snapshot_version: (none|\d+), latest_transaction_version: (none|\d+)",
)?.captures(s).ok_or_else(|| anyhow!("Not in BackupStorageState display format: {}", s))?;
Ok(Self {
latest_epoch_ending_epoch: captures.get(1).parse_option_u64()?,
latest_state_snapshot_version: captures.get(2).parse_option_u64()?,
latest_transaction_version: captures.get(3).parse_option_u64()?,
})
}
}