use s2_common::{
bash::Bash,
record::StreamPosition,
types::{
basin::BasinName,
config::{OptionalStreamConfig, StreamReconfiguration},
resources::{CreateMode, ListItemsRequestParts, Page, RequestToken},
stream::{ListStreamsRequest, StreamInfo, StreamName},
},
};
use slatedb::{
IsolationLevel,
config::{DurabilityLevel, ScanOptions, WriteOptions},
};
use time::OffsetDateTime;
use tracing::instrument;
use super::{
Backend, CreatedOrReconfigured,
store::db_txn_get,
streamer::{doe_arm_delay, retention_age_or_zero},
};
use crate::backend::{
error::{
BasinDeletionPendingError, BasinNotFoundError, CreateStreamError, DeleteStreamError,
GetStreamConfigError, ListStreamsError, ReconfigureStreamError, StorageError,
StreamAlreadyExistsError, StreamDeletionPendingError, StreamNotFoundError, StreamerError,
},
kv,
stream_id::StreamId,
};
impl Backend {
pub async fn list_streams(
&self,
basin: BasinName,
request: ListStreamsRequest,
) -> Result<Page<StreamInfo>, ListStreamsError> {
let ListItemsRequestParts {
prefix,
start_after,
limit,
} = request.into();
let key_range = kv::stream_meta::ser_key_range(&basin, &prefix, &start_after);
if key_range.is_empty() {
return Ok(Page::new_empty());
}
static SCAN_OPTS: ScanOptions = ScanOptions {
durability_filter: DurabilityLevel::Remote,
dirty: false,
read_ahead_bytes: 1,
cache_blocks: false,
max_fetch_tasks: 1,
};
let mut it = self.db.scan_with_options(key_range, &SCAN_OPTS).await?;
let mut streams = Vec::with_capacity(limit.as_usize());
let mut has_more = false;
while let Some(kv) = it.next().await? {
let (deser_basin, stream) = kv::stream_meta::deser_key(kv.key)?;
assert_eq!(deser_basin.as_ref(), basin.as_ref());
assert!(stream.as_ref() > start_after.as_ref());
assert!(stream.as_ref() >= prefix.as_ref());
if streams.len() == limit.as_usize() {
has_more = true;
break;
}
let meta = kv::stream_meta::deser_value(kv.value)?;
streams.push(StreamInfo {
name: stream,
created_at: meta.created_at,
deleted_at: meta.deleted_at,
});
}
Ok(Page::new(streams, has_more))
}
pub async fn create_stream(
&self,
basin: BasinName,
stream: StreamName,
config: impl Into<StreamReconfiguration>,
mode: CreateMode,
) -> Result<CreatedOrReconfigured<StreamInfo>, CreateStreamError> {
let config = config.into();
let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
let Some(basin_meta) = db_txn_get(
&txn,
kv::basin_meta::ser_key(&basin),
kv::basin_meta::deser_value,
)
.await?
else {
return Err(BasinNotFoundError { basin }.into());
};
if basin_meta.deleted_at.is_some() {
return Err(BasinDeletionPendingError { basin }.into());
}
let stream_meta_key = kv::stream_meta::ser_key(&basin, &stream);
let creation_idempotency_key = match &mode {
CreateMode::CreateOnly(Some(req_token)) => {
let resolved = OptionalStreamConfig::default().reconfigure(config.clone());
Some(creation_idempotency_key(req_token, &resolved))
}
_ => None,
};
let mut existing_meta_opt = None;
let mut prior_doe_min_age = None;
if let Some(existing_meta) =
db_txn_get(&txn, &stream_meta_key, kv::stream_meta::deser_value).await?
{
if existing_meta.deleted_at.is_some() {
return Err(CreateStreamError::StreamDeletionPending(
StreamDeletionPendingError { basin, stream },
));
}
prior_doe_min_age = existing_meta
.config
.delete_on_empty
.min_age
.filter(|age| !age.is_zero());
match mode {
CreateMode::CreateOnly(_) => {
return if creation_idempotency_key.is_some()
&& existing_meta.creation_idempotency_key == creation_idempotency_key
{
Ok(CreatedOrReconfigured::Created(StreamInfo {
name: stream,
created_at: existing_meta.created_at,
deleted_at: None,
}))
} else {
Err(StreamAlreadyExistsError { basin, stream }.into())
};
}
CreateMode::CreateOrReconfigure => {
existing_meta_opt = Some(existing_meta);
}
}
}
let is_reconfigure = existing_meta_opt.is_some();
let (resolved, created_at) = match existing_meta_opt {
Some(existing) => (existing.config.reconfigure(config), existing.created_at),
None => (
OptionalStreamConfig::default().reconfigure(config),
OffsetDateTime::now_utc(),
),
};
let resolved: OptionalStreamConfig = resolved
.merge(basin_meta.config.default_stream_config)
.into();
let meta = kv::stream_meta::StreamMeta {
config: resolved.clone(),
created_at,
deleted_at: None,
creation_idempotency_key,
};
txn.put(&stream_meta_key, kv::stream_meta::ser_value(&meta))?;
let stream_id = StreamId::new(&basin, &stream);
if !is_reconfigure {
txn.put(
kv::stream_id_mapping::ser_key(stream_id),
kv::stream_id_mapping::ser_value(&basin, &stream),
)?;
let created_secs = created_at.unix_timestamp();
let created_secs = if created_secs <= 0 {
0
} else if created_secs >= i64::from(u32::MAX) {
u32::MAX
} else {
created_secs as u32
};
txn.put(
kv::stream_tail_position::ser_key(stream_id),
kv::stream_tail_position::ser_value(
StreamPosition::MIN,
kv::timestamp::TimestampSecs::from_secs(created_secs),
),
)?;
}
if let Some(min_age) = meta
.config
.delete_on_empty
.min_age
.filter(|age| !age.is_zero())
&& (!is_reconfigure || prior_doe_min_age.is_none())
{
txn.put(
kv::stream_doe_deadline::ser_key(
kv::timestamp::TimestampSecs::after(doe_arm_delay(
retention_age_or_zero(&meta.config),
min_age,
)),
stream_id,
),
kv::stream_doe_deadline::ser_value(min_age),
)?;
}
static WRITE_OPTS: WriteOptions = WriteOptions {
await_durable: true,
};
txn.commit_with_options(&WRITE_OPTS).await?;
if is_reconfigure && let Some(client) = self.streamer_client_if_active(&basin, &stream) {
client.advise_reconfig(resolved);
}
let info = StreamInfo {
name: stream,
created_at,
deleted_at: None,
};
Ok(if is_reconfigure {
CreatedOrReconfigured::Reconfigured(info)
} else {
CreatedOrReconfigured::Created(info)
})
}
pub(super) async fn stream_id_mapping(
&self,
stream_id: StreamId,
) -> Result<Option<(BasinName, StreamName)>, StorageError> {
self.db_get(
kv::stream_id_mapping::ser_key(stream_id),
kv::stream_id_mapping::deser_value,
)
.await
}
pub async fn get_stream_config(
&self,
basin: BasinName,
stream: StreamName,
) -> Result<OptionalStreamConfig, GetStreamConfigError> {
let meta = self
.db_get(
kv::stream_meta::ser_key(&basin, &stream),
kv::stream_meta::deser_value,
)
.await?
.ok_or_else(|| StreamNotFoundError {
basin: basin.clone(),
stream: stream.clone(),
})?;
if meta.deleted_at.is_some() {
return Err(StreamDeletionPendingError { basin, stream }.into());
}
Ok(meta.config)
}
pub async fn reconfigure_stream(
&self,
basin: BasinName,
stream: StreamName,
reconfig: StreamReconfiguration,
) -> Result<OptionalStreamConfig, ReconfigureStreamError> {
let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
let meta_key = kv::stream_meta::ser_key(&basin, &stream);
let mut meta = db_txn_get(&txn, &meta_key, kv::stream_meta::deser_value)
.await?
.ok_or_else(|| StreamNotFoundError {
basin: basin.clone(),
stream: stream.clone(),
})?;
if meta.deleted_at.is_some() {
return Err(StreamDeletionPendingError { basin, stream }.into());
}
let prior_doe_min_age = meta
.config
.delete_on_empty
.min_age
.filter(|age| !age.is_zero());
meta.config = meta.config.reconfigure(reconfig);
txn.put(&meta_key, kv::stream_meta::ser_value(&meta))?;
let stream_id = StreamId::new(&basin, &stream);
if let Some(min_age) = meta
.config
.delete_on_empty
.min_age
.filter(|age| !age.is_zero())
&& prior_doe_min_age.is_none()
{
txn.put(
kv::stream_doe_deadline::ser_key(
kv::timestamp::TimestampSecs::after(doe_arm_delay(
retention_age_or_zero(&meta.config),
min_age,
)),
stream_id,
),
kv::stream_doe_deadline::ser_value(min_age),
)?;
}
static WRITE_OPTS: WriteOptions = WriteOptions {
await_durable: true,
};
txn.commit_with_options(&WRITE_OPTS).await?;
if let Some(client) = self.streamer_client_if_active(&basin, &stream) {
client.advise_reconfig(meta.config.clone());
}
Ok(meta.config)
}
#[instrument(ret, err, skip(self))]
pub async fn delete_stream(
&self,
basin: BasinName,
stream: StreamName,
) -> Result<(), DeleteStreamError> {
match self.streamer_client(&basin, &stream).await {
Ok(client) => {
client.terminal_trim().await?;
}
Err(StreamerError::Storage(e)) => {
return Err(DeleteStreamError::Storage(e));
}
Err(StreamerError::StreamNotFound(e)) => {
return Err(DeleteStreamError::StreamNotFound(e));
}
Err(StreamerError::StreamDeletionPending(e)) => {
assert_eq!(e.basin, basin);
assert_eq!(e.stream, stream);
}
}
let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
let meta_key = kv::stream_meta::ser_key(&basin, &stream);
let mut meta = db_txn_get(&txn, &meta_key, kv::stream_meta::deser_value)
.await?
.ok_or_else(|| StreamNotFoundError {
basin,
stream: stream.clone(),
})?;
if meta.deleted_at.is_none() {
meta.deleted_at = Some(OffsetDateTime::now_utc());
txn.put(&meta_key, kv::stream_meta::ser_value(&meta))?;
static WRITE_OPTS: WriteOptions = WriteOptions {
await_durable: true,
};
txn.commit_with_options(&WRITE_OPTS).await?;
}
Ok(())
}
}
fn creation_idempotency_key(req_token: &RequestToken, config: &OptionalStreamConfig) -> Bash {
Bash::length_prefixed(&[
req_token.as_bytes(),
&s2_api::v1::config::StreamConfig::to_opt(config.clone())
.as_ref()
.map(|v| serde_json::to_vec(v).expect("serializable"))
.unwrap_or_default(),
])
}