1use s2_common::{
2 bash::Bash,
3 types::{
4 basin::{BasinInfo, BasinName, BasinState, ListBasinsRequest},
5 config::{BasinConfig, BasinReconfiguration},
6 resources::{CreateMode, ListItemsRequestParts, Page, RequestToken},
7 stream::StreamNameStartAfter,
8 },
9};
10use slatedb::{
11 IsolationLevel,
12 config::{DurabilityLevel, ScanOptions, WriteOptions},
13};
14use time::OffsetDateTime;
15
16use super::{Backend, CreatedOrReconfigured, store::db_txn_get};
17use crate::backend::{
18 error::{
19 BasinAlreadyExistsError, BasinDeletionPendingError, BasinNotFoundError, CreateBasinError,
20 DeleteBasinError, GetBasinConfigError, ListBasinsError, ReconfigureBasinError,
21 },
22 kv,
23};
24
25impl Backend {
26 pub async fn list_basins(
27 &self,
28 request: ListBasinsRequest,
29 ) -> Result<Page<BasinInfo>, ListBasinsError> {
30 let ListItemsRequestParts {
31 prefix,
32 start_after,
33 limit,
34 } = request.into();
35
36 let key_range = kv::basin_meta::ser_key_range(&prefix, &start_after);
37 if key_range.is_empty() {
38 return Ok(Page::new_empty());
39 }
40
41 const SCAN_OPTS: ScanOptions = ScanOptions {
42 durability_filter: DurabilityLevel::Remote,
43 dirty: false,
44 read_ahead_bytes: 1,
45 cache_blocks: false,
46 max_fetch_tasks: 1,
47 };
48 let mut it = self.db.scan_with_options(key_range, &SCAN_OPTS).await?;
49
50 let mut basins = Vec::with_capacity(limit.as_usize());
51 let mut has_more = false;
52 while let Some(kv) = it.next().await? {
53 let basin = kv::basin_meta::deser_key(kv.key)?;
54 assert!(basin.as_ref() > start_after.as_ref());
55 assert!(basin.as_ref() >= prefix.as_ref());
56 if basins.len() == limit.as_usize() {
57 has_more = true;
58 break;
59 }
60 let meta = kv::basin_meta::deser_value(kv.value)?;
61 let state = if meta.deleted_at.is_some() {
62 BasinState::Deleting
63 } else {
64 BasinState::Active
65 };
66 basins.push(BasinInfo {
67 name: basin,
68 scope: None,
69 state,
70 });
71 }
72 Ok(Page::new(basins, has_more))
73 }
74
75 pub async fn create_basin(
76 &self,
77 basin: BasinName,
78 config: BasinConfig,
79 mode: CreateMode,
80 ) -> Result<CreatedOrReconfigured<BasinInfo>, CreateBasinError> {
81 let meta_key = kv::basin_meta::ser_key(&basin);
82
83 let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
84
85 let creation_idempotency_key = match &mode {
86 CreateMode::CreateOnly(Some(req_token)) => {
87 Some(creation_idempotency_key(req_token, &config))
88 }
89 _ => None,
90 };
91
92 let mut existing_created_at = None;
93 if let Some(existing_meta) =
94 db_txn_get(&txn, &meta_key, kv::basin_meta::deser_value).await?
95 {
96 if existing_meta.deleted_at.is_some() {
97 return Err(BasinDeletionPendingError { basin }.into());
98 }
99 match mode {
100 CreateMode::CreateOnly(_) => {
101 return if creation_idempotency_key.is_some()
102 && existing_meta.creation_idempotency_key == creation_idempotency_key
103 {
104 Ok(CreatedOrReconfigured::Created(BasinInfo {
105 name: basin,
106 scope: None,
107 state: BasinState::Active,
108 }))
109 } else {
110 Err(BasinAlreadyExistsError { basin }.into())
111 };
112 }
113 CreateMode::CreateOrReconfigure => {
114 existing_created_at = Some(existing_meta.created_at);
115 }
116 }
117 }
118
119 let created_at = existing_created_at.unwrap_or_else(OffsetDateTime::now_utc);
120
121 let meta = kv::basin_meta::BasinMeta {
122 config,
123 created_at,
124 deleted_at: None,
125 creation_idempotency_key,
126 };
127
128 txn.put(&meta_key, kv::basin_meta::ser_value(&meta))?;
129
130 static WRITE_OPTS: WriteOptions = WriteOptions {
131 await_durable: true,
132 };
133 txn.commit_with_options(&WRITE_OPTS).await?;
134
135 let info = BasinInfo {
136 name: basin,
137 scope: None,
138 state: BasinState::Active,
139 };
140
141 Ok(if existing_created_at.is_some() {
142 CreatedOrReconfigured::Reconfigured(info)
143 } else {
144 CreatedOrReconfigured::Created(info)
145 })
146 }
147
148 pub async fn get_basin_config(
149 &self,
150 basin: BasinName,
151 ) -> Result<BasinConfig, GetBasinConfigError> {
152 let Some(meta) = self
153 .db_get(kv::basin_meta::ser_key(&basin), kv::basin_meta::deser_value)
154 .await?
155 else {
156 return Err(BasinNotFoundError { basin }.into());
157 };
158 Ok(meta.config)
159 }
160
161 pub async fn reconfigure_basin(
162 &self,
163 basin: BasinName,
164 reconfig: BasinReconfiguration,
165 ) -> Result<BasinConfig, ReconfigureBasinError> {
166 let meta_key = kv::basin_meta::ser_key(&basin);
167
168 let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
169
170 let Some(mut meta) = db_txn_get(&txn, &meta_key, kv::basin_meta::deser_value).await? else {
171 return Err(BasinNotFoundError { basin }.into());
172 };
173
174 if meta.deleted_at.is_some() {
175 return Err(BasinDeletionPendingError { basin }.into());
176 }
177
178 meta.config = meta.config.reconfigure(reconfig);
179
180 txn.put(&meta_key, kv::basin_meta::ser_value(&meta))?;
181
182 static WRITE_OPTS: WriteOptions = WriteOptions {
183 await_durable: true,
184 };
185 txn.commit_with_options(&WRITE_OPTS).await?;
186
187 Ok(meta.config)
188 }
189
190 pub async fn delete_basin(&self, basin: BasinName) -> Result<(), DeleteBasinError> {
191 let txn = self.db.begin(IsolationLevel::SerializableSnapshot).await?;
192 let meta_key = kv::basin_meta::ser_key(&basin);
193 let Some(mut meta) = db_txn_get(&txn, &meta_key, kv::basin_meta::deser_value).await? else {
194 return Err(BasinNotFoundError { basin }.into());
195 };
196 if meta.deleted_at.is_none() {
197 meta.deleted_at = Some(OffsetDateTime::now_utc());
198 txn.put(&meta_key, kv::basin_meta::ser_value(&meta))?;
199 txn.put(
200 kv::basin_deletion_pending::ser_key(&basin),
201 kv::basin_deletion_pending::ser_value(&StreamNameStartAfter::default()),
202 )?;
203 static WRITE_OPTS: WriteOptions = WriteOptions {
204 await_durable: true,
205 };
206 txn.commit_with_options(&WRITE_OPTS).await?;
207 }
208 Ok(())
209 }
210}
211
212fn creation_idempotency_key(req_token: &RequestToken, config: &BasinConfig) -> Bash {
213 Bash::new(&[
214 req_token.as_bytes(),
215 &serde_json::to_vec(&s2_api::v1::config::BasinConfig::from(config.clone()))
216 .expect("serializable"),
217 ])
218}