common_meta/cache/flow/
table_flownode.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
// Copyright 2023 Greptime Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::collections::HashMap;
use std::sync::Arc;

use futures::future::BoxFuture;
use moka::future::Cache;
use moka::ops::compute::Op;
use table::metadata::TableId;

use crate::cache::{CacheContainer, Initializer};
use crate::error::Result;
use crate::instruction::{CacheIdent, CreateFlow, DropFlow};
use crate::key::flow::{TableFlowManager, TableFlowManagerRef};
use crate::kv_backend::KvBackendRef;
use crate::peer::Peer;
use crate::FlownodeId;

type FlownodeSet = Arc<HashMap<FlownodeId, Peer>>;

pub type TableFlownodeSetCacheRef = Arc<TableFlownodeSetCache>;

/// [TableFlownodeSetCache] caches the [TableId] to [FlownodeSet] mapping.
pub type TableFlownodeSetCache = CacheContainer<TableId, FlownodeSet, CacheIdent>;

/// Constructs a [TableFlownodeSetCache].
pub fn new_table_flownode_set_cache(
    name: String,
    cache: Cache<TableId, FlownodeSet>,
    kv_backend: KvBackendRef,
) -> TableFlownodeSetCache {
    let table_flow_manager = Arc::new(TableFlowManager::new(kv_backend));
    let init = init_factory(table_flow_manager);

    CacheContainer::new(name, cache, Box::new(invalidator), init, filter)
}

fn init_factory(table_flow_manager: TableFlowManagerRef) -> Initializer<TableId, FlownodeSet> {
    Arc::new(move |&table_id| {
        let table_flow_manager = table_flow_manager.clone();
        Box::pin(async move {
            table_flow_manager
                .flows(table_id)
                .await
                .map(|flows| {
                    flows
                        .into_iter()
                        .map(|(key, value)| (key.flownode_id(), value.peer))
                        .collect::<HashMap<_, _>>()
                })
                // We must cache the `HashSet` even if it's empty,
                // to avoid future requests to the remote storage next time;
                // If the value is added to the remote storage,
                // we have a corresponding cache invalidation mechanism to invalidate `(Key, EmptyHashSet)`.
                .map(Arc::new)
                .map(Some)
        })
    })
}

async fn handle_create_flow(
    cache: &Cache<TableId, FlownodeSet>,
    CreateFlow {
        source_table_ids,
        flownodes: flownode_peers,
    }: &CreateFlow,
) {
    for table_id in source_table_ids {
        let entry = cache.entry(*table_id);
        entry
            .and_compute_with(
                async |entry: Option<moka::Entry<u32, Arc<HashMap<u64, _>>>>| match entry {
                    Some(entry) => {
                        let mut map = entry.into_value().as_ref().clone();
                        map.extend(flownode_peers.iter().map(|peer| (peer.id, peer.clone())));

                        Op::Put(Arc::new(map))
                    }
                    None => Op::Put(Arc::new(HashMap::from_iter(
                        flownode_peers.iter().map(|peer| (peer.id, peer.clone())),
                    ))),
                },
            )
            .await;
    }
}

async fn handle_drop_flow(
    cache: &Cache<TableId, FlownodeSet>,
    DropFlow {
        source_table_ids,
        flownode_ids,
    }: &DropFlow,
) {
    for table_id in source_table_ids {
        let entry = cache.entry(*table_id);
        entry
            .and_compute_with(
                async |entry: Option<moka::Entry<u32, Arc<HashMap<u64, _>>>>| match entry {
                    Some(entry) => {
                        let mut set = entry.into_value().as_ref().clone();
                        for flownode_id in flownode_ids {
                            set.remove(flownode_id);
                        }

                        Op::Put(Arc::new(set))
                    }
                    None => {
                        // Do nothing
                        Op::Nop
                    }
                },
            )
            .await;
    }
}

fn invalidator<'a>(
    cache: &'a Cache<TableId, FlownodeSet>,
    ident: &'a CacheIdent,
) -> BoxFuture<'a, Result<()>> {
    Box::pin(async move {
        match ident {
            CacheIdent::CreateFlow(create_flow) => handle_create_flow(cache, create_flow).await,
            CacheIdent::DropFlow(drop_flow) => handle_drop_flow(cache, drop_flow).await,
            _ => {}
        }
        Ok(())
    })
}

fn filter(ident: &CacheIdent) -> bool {
    matches!(ident, CacheIdent::CreateFlow(_) | CacheIdent::DropFlow(_))
}

#[cfg(test)]
mod tests {
    use std::collections::{BTreeMap, HashMap};
    use std::sync::Arc;

    use common_catalog::consts::{DEFAULT_CATALOG_NAME, DEFAULT_SCHEMA_NAME};
    use moka::future::CacheBuilder;
    use table::table_name::TableName;

    use crate::cache::flow::table_flownode::new_table_flownode_set_cache;
    use crate::instruction::{CacheIdent, CreateFlow, DropFlow};
    use crate::key::flow::flow_info::FlowInfoValue;
    use crate::key::flow::flow_route::FlowRouteValue;
    use crate::key::flow::FlowMetadataManager;
    use crate::kv_backend::memory::MemoryKvBackend;
    use crate::peer::Peer;

    #[tokio::test]
    async fn test_cache_empty_set() {
        let mem_kv = Arc::new(MemoryKvBackend::default());
        let cache = CacheBuilder::new(128).build();
        let cache = new_table_flownode_set_cache("test".to_string(), cache, mem_kv);
        let set = cache.get(1024).await.unwrap().unwrap();
        assert!(set.is_empty());
    }

    #[tokio::test]
    async fn test_get() {
        let mem_kv = Arc::new(MemoryKvBackend::default());
        let flownode_metadata_manager = FlowMetadataManager::new(mem_kv.clone());
        flownode_metadata_manager
            .create_flow_metadata(
                1024,
                FlowInfoValue {
                    source_table_ids: vec![1024, 1025],
                    sink_table_name: TableName {
                        catalog_name: DEFAULT_CATALOG_NAME.to_string(),
                        schema_name: DEFAULT_SCHEMA_NAME.to_string(),
                        table_name: "sink_table".to_string(),
                    },
                    flownode_ids: BTreeMap::from([(0, 1), (1, 2), (2, 3)]),
                    catalog_name: DEFAULT_CATALOG_NAME.to_string(),
                    flow_name: "my_flow".to_string(),
                    raw_sql: "sql".to_string(),
                    expire_after: Some(300),
                    comment: "comment".to_string(),
                    options: Default::default(),
                    created_time: chrono::Utc::now(),
                    updated_time: chrono::Utc::now(),
                },
                (1..=3)
                    .map(|i| {
                        (
                            (i - 1) as u32,
                            FlowRouteValue {
                                peer: Peer::empty(i),
                            },
                        )
                    })
                    .collect::<Vec<_>>(),
            )
            .await
            .unwrap();
        let cache = CacheBuilder::new(128).build();
        let cache = new_table_flownode_set_cache("test".to_string(), cache, mem_kv);
        let set = cache.get(1024).await.unwrap().unwrap();
        assert_eq!(
            set.as_ref().clone(),
            HashMap::from_iter((1..=3).map(|i| { (i, Peer::empty(i),) }))
        );
        let set = cache.get(1025).await.unwrap().unwrap();
        assert_eq!(
            set.as_ref().clone(),
            HashMap::from_iter((1..=3).map(|i| { (i, Peer::empty(i),) }))
        );
        let result = cache.get(1026).await.unwrap().unwrap();
        assert_eq!(result.len(), 0);
    }

    #[tokio::test]
    async fn test_create_flow() {
        let mem_kv = Arc::new(MemoryKvBackend::default());
        let cache = CacheBuilder::new(128).build();
        let cache = new_table_flownode_set_cache("test".to_string(), cache, mem_kv);
        let ident = vec![CacheIdent::CreateFlow(CreateFlow {
            source_table_ids: vec![1024, 1025],
            flownodes: (1..=5).map(Peer::empty).collect(),
        })];
        cache.invalidate(&ident).await.unwrap();
        let set = cache.get(1024).await.unwrap().unwrap();
        assert_eq!(set.len(), 5);
        let set = cache.get(1025).await.unwrap().unwrap();
        assert_eq!(set.len(), 5);
    }

    #[tokio::test]
    async fn test_drop_flow() {
        let mem_kv = Arc::new(MemoryKvBackend::default());
        let cache = CacheBuilder::new(128).build();
        let cache = new_table_flownode_set_cache("test".to_string(), cache, mem_kv);
        let ident = vec![
            CacheIdent::CreateFlow(CreateFlow {
                source_table_ids: vec![1024, 1025],
                flownodes: (1..=5).map(Peer::empty).collect(),
            }),
            CacheIdent::CreateFlow(CreateFlow {
                source_table_ids: vec![1024, 1025],
                flownodes: (11..=12).map(Peer::empty).collect(),
            }),
        ];
        cache.invalidate(&ident).await.unwrap();
        let set = cache.get(1024).await.unwrap().unwrap();
        assert_eq!(set.len(), 7);
        let set = cache.get(1025).await.unwrap().unwrap();
        assert_eq!(set.len(), 7);

        let ident = vec![CacheIdent::DropFlow(DropFlow {
            source_table_ids: vec![1024, 1025],
            flownode_ids: vec![1, 2, 3, 4, 5],
        })];
        cache.invalidate(&ident).await.unwrap();
        let set = cache.get(1024).await.unwrap().unwrap();
        assert_eq!(
            set.as_ref().clone(),
            HashMap::from_iter((11..=12).map(|i| { (i, Peer::empty(i),) }))
        );
        let set = cache.get(1025).await.unwrap().unwrap();
        assert_eq!(
            set.as_ref().clone(),
            HashMap::from_iter((11..=12).map(|i| { (i, Peer::empty(i),) }))
        );
    }
}