opendal_service_moka/
backend.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::fmt::Debug;
19use std::sync::Arc;
20
21use log::debug;
22
23use super::MOKA_SCHEME;
24use super::config::MokaConfig;
25use super::core::*;
26use super::deleter::MokaDeleter;
27use super::lister::MokaLister;
28use super::reader::*;
29use super::writer::MokaWriter;
30use opendal_core::raw::*;
31use opendal_core::*;
32
33/// Type alias of [`moka::future::Cache`](https://docs.rs/moka/latest/moka/future/struct.Cache.html)
34pub type MokaCache<K, V> = moka::future::Cache<K, V>;
35/// Type alias of [`moka::future::CacheBuilder`](https://docs.rs/moka/latest/moka/future/struct.CacheBuilder.html)
36pub type MokaCacheBuilder<K, V> = moka::future::CacheBuilder<K, V, MokaCache<K, V>>;
37
38/// [moka](https://github.com/moka-rs/moka) backend support.
39#[doc = include_str!("docs.md")]
40#[derive(Default)]
41pub struct MokaBuilder {
42    pub(super) config: MokaConfig,
43    pub(super) builder: MokaCacheBuilder<String, MokaValue>,
44}
45
46impl Debug for MokaBuilder {
47    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
48        f.debug_struct("MokaBuilder")
49            .field("config", &self.config)
50            .finish_non_exhaustive()
51    }
52}
53
54impl MokaBuilder {
55    /// Create a [`MokaBuilder`] with the given [`moka::future::CacheBuilder`].
56    ///
57    /// Refer to [`moka::future::CacheBuilder`](https://docs.rs/moka/latest/moka/future/struct.CacheBuilder.html)
58    ///
59    /// # Example
60    ///
61    /// ```no_run
62    /// # use std::sync::Arc;
63    /// # use std::time::Duration;
64    /// # use log::debug;
65    /// # use moka::notification::RemovalCause;
66    /// # use opendal_service_moka::Moka;
67    /// # use opendal_service_moka::MokaCacheBuilder;
68    /// # use opendal_service_moka::MokaValue;
69    /// # use opendal_core::Configurator;
70    /// let moka = Moka::new(
71    ///     MokaCacheBuilder::<String, MokaValue>::default()
72    ///         .name("demo")
73    ///         .max_capacity(1000)
74    ///         .time_to_live(Duration::from_secs(300))
75    ///         .weigher(|k, v| (k.len() + v.content.len()) as u32)
76    ///         .eviction_listener(|k: Arc<String>, v: MokaValue, cause: RemovalCause| {
77    ///             debug!(
78    ///                 "moka cache eviction listener, key = {}, value = {:?}, cause = {:?}",
79    ///                 k.as_str(), v.content.to_vec(), cause
80    ///             );
81    ///         })
82    /// );
83    /// ```
84    pub fn new(builder: MokaCacheBuilder<String, MokaValue>) -> Self {
85        Self {
86            builder,
87            ..Default::default()
88        }
89    }
90
91    /// Sets the name of the cache.
92    ///
93    /// Refer to [`moka::future::CacheBuilder::name`](https://docs.rs/moka/latest/moka/future/struct.CacheBuilder.html#method.name)
94    pub fn name(mut self, v: &str) -> Self {
95        if !v.is_empty() {
96            self.config.name = Some(v.to_owned());
97        }
98        self
99    }
100
101    /// Sets the max capacity of the cache.
102    ///
103    /// Refer to [`moka::future::CacheBuilder::max_capacity`](https://docs.rs/moka/latest/moka/future/struct.CacheBuilder.html#method.max_capacity)
104    pub fn max_capacity(mut self, v: u64) -> Self {
105        if v != 0 {
106            self.config.max_capacity = Some(v);
107        }
108        self
109    }
110
111    /// Sets the time to live of the cache.
112    ///
113    /// Refer to [`moka::future::CacheBuilder::time_to_live`](https://docs.rs/moka/latest/moka/future/struct.CacheBuilder.html#method.time_to_live)
114    pub fn time_to_live(mut self, v: Duration) -> Self {
115        if !v.is_zero() {
116            self.config.time_to_live = Some(format!("{}s", v.as_secs()));
117        }
118        self
119    }
120
121    /// Sets the time to idle of the cache.
122    ///
123    /// Refer to [`moka::future::CacheBuilder::time_to_idle`](https://docs.rs/moka/latest/moka/sync/struct.CacheBuilder.html#method.time_to_idle)
124    pub fn time_to_idle(mut self, v: Duration) -> Self {
125        if !v.is_zero() {
126            self.config.time_to_idle = Some(format!("{}s", v.as_secs()));
127        }
128        self
129    }
130
131    /// Set the root path of this backend
132    pub fn root(mut self, path: &str) -> Self {
133        self.config.root = if path.is_empty() {
134            None
135        } else {
136            Some(path.to_string())
137        };
138        self
139    }
140}
141
142impl Builder for MokaBuilder {
143    type Config = MokaConfig;
144
145    fn build(self) -> Result<impl Service> {
146        debug!("backend build started: {:?}", self);
147
148        let root = normalize_root(
149            self.config
150                .root
151                .clone()
152                .unwrap_or_else(|| "/".to_string())
153                .as_str(),
154        );
155
156        let mut builder = self.builder;
157
158        if let Some(v) = &self.config.name {
159            builder = builder.name(v);
160        }
161        if let Some(v) = self.config.max_capacity {
162            builder = builder.max_capacity(v);
163        }
164        if let Some(value) = self.config.time_to_live.as_deref() {
165            let duration = signed_to_duration(value)?;
166            builder = builder.time_to_live(duration);
167        }
168        if let Some(value) = self.config.time_to_idle.as_deref() {
169            let duration = signed_to_duration(value)?;
170            builder = builder.time_to_idle(duration);
171        }
172
173        debug!("backend build finished: {:?}", self.config);
174
175        let core = MokaCore {
176            cache: builder.build(),
177        };
178
179        Ok(MokaBackend::new(core).with_normalized_root(root))
180    }
181}
182
183#[derive(Debug, Clone)]
184pub struct MokaBackend {
185    pub(crate) core: Arc<MokaCore>,
186    pub(crate) root: String,
187    pub(crate) info: ServiceInfo,
188    pub(crate) capability: Capability,
189}
190
191impl MokaBackend {
192    fn new(core: MokaCore) -> Self {
193        let info = ServiceInfo::new(MOKA_SCHEME, "/", core.cache.name().unwrap_or("moka"));
194        let capability = Capability {
195            read: true,
196            write: true,
197            write_can_empty: true,
198            write_with_cache_control: true,
199            write_with_content_type: true,
200            write_with_content_disposition: true,
201            write_with_content_encoding: true,
202            delete: true,
203            stat: true,
204            list: true,
205            ..Default::default()
206        };
207
208        Self {
209            core: Arc::new(core),
210            root: "/".to_string(),
211            info,
212            capability,
213        }
214    }
215
216    fn with_normalized_root(mut self, root: String) -> Self {
217        self.info = self.info.with_root(&root);
218        self.root = root;
219        self
220    }
221}
222
223impl Service for MokaBackend {
224    type Reader = oio::StreamReader<MokaReader>;
225    type Writer = MokaWriter;
226    type Lister = oio::HierarchyLister<MokaLister>;
227    type Deleter = oio::OneShotDeleter<MokaDeleter>;
228    type Copier = ();
229
230    fn info(&self) -> ServiceInfo {
231        self.info.clone()
232    }
233
234    fn capability(&self) -> Capability {
235        self.capability
236    }
237
238    async fn create_dir(
239        &self,
240        _ctx: &OperationContext,
241        _path: &str,
242        _args: OpCreateDir,
243    ) -> Result<RpCreateDir> {
244        Err(Error::new(
245            ErrorKind::Unsupported,
246            "operation is not supported",
247        ))
248    }
249
250    async fn stat(&self, _ctx: &OperationContext, path: &str, _: OpStat) -> Result<RpStat> {
251        let p = build_abs_path(&self.root, path);
252
253        if p == build_abs_path(&self.root, "") {
254            Ok(RpStat::new(Metadata::new(EntryMode::DIR)))
255        } else {
256            // Check the exact path first
257            match self.core.get(&p).await? {
258                Some(value) => {
259                    // Use the stored metadata but override mode if necessary
260                    let mut metadata = value.metadata.clone();
261                    // If path ends with '/' but we found a file, return DIR
262                    // This is because CompleteLayer's create_dir creates empty files with '/' suffix
263                    if p.ends_with('/') && metadata.mode() != EntryMode::DIR {
264                        metadata.set_mode(EntryMode::DIR);
265                    }
266                    Ok(RpStat::new(metadata))
267                }
268                None => {
269                    // If path ends with '/', check if there are any children
270                    if p.ends_with('/') {
271                        let has_children = self
272                            .core
273                            .cache
274                            .iter()
275                            .any(|kv| kv.0.starts_with(&p) && kv.0.len() > p.len());
276
277                        if has_children {
278                            Ok(RpStat::new(Metadata::new(EntryMode::DIR)))
279                        } else {
280                            Err(Error::new(ErrorKind::NotFound, "key not found in moka"))
281                        }
282                    } else {
283                        Err(Error::new(ErrorKind::NotFound, "key not found in moka"))
284                    }
285                }
286            }
287        }
288    }
289    fn read(&self, _ctx: &OperationContext, path: &str, args: OpRead) -> Result<Self::Reader> {
290        let output: oio::StreamReader<MokaReader> = {
291            Ok(oio::StreamReader::new(MokaReader::new(
292                self.clone(),
293                path,
294                args,
295            )))
296        }?;
297
298        Ok(output)
299    }
300
301    fn write(&self, _ctx: &OperationContext, path: &str, args: OpWrite) -> Result<Self::Writer> {
302        let output: MokaWriter = {
303            let p = build_abs_path(&self.root, path);
304            Ok(MokaWriter::new(self.core.clone(), p, args))
305        }?;
306
307        Ok(output)
308    }
309
310    fn delete(&self, _ctx: &OperationContext) -> Result<Self::Deleter> {
311        let output: oio::OneShotDeleter<MokaDeleter> = {
312            Ok(oio::OneShotDeleter::new(MokaDeleter::new(
313                self.core.clone(),
314                self.root.clone(),
315            )))
316        }?;
317
318        Ok(output)
319    }
320
321    fn list(&self, _ctx: &OperationContext, path: &str, args: OpList) -> Result<Self::Lister> {
322        let output: oio::HierarchyLister<MokaLister> = {
323            // For moka, we don't distinguish between files and directories
324            // Just return the lister to iterate through all matching keys
325            let lister = MokaLister::new(self.core.clone(), self.root.clone(), path.to_string());
326            let lister = oio::HierarchyLister::new(lister, path, args.recursive());
327            Ok(lister)
328        }?;
329
330        Ok(output)
331    }
332
333    fn copy(
334        &self,
335        _ctx: &OperationContext,
336        _from: &str,
337        _to: &str,
338        _args: OpCopy,
339        _opts: OpCopier,
340    ) -> Result<Self::Copier> {
341        Err(Error::new(
342            ErrorKind::Unsupported,
343            "operation is not supported",
344        ))
345    }
346
347    async fn rename(
348        &self,
349        _ctx: &OperationContext,
350        _from: &str,
351        _to: &str,
352        _args: OpRename,
353    ) -> Result<RpRename> {
354        Err(Error::new(
355            ErrorKind::Unsupported,
356            "operation is not supported",
357        ))
358    }
359
360    async fn presign(
361        &self,
362        _ctx: &OperationContext,
363        _path: &str,
364        _args: OpPresign,
365    ) -> Result<RpPresign> {
366        Err(Error::new(
367            ErrorKind::Unsupported,
368            "operation is not supported",
369        ))
370    }
371}
opendal_service_moka/backend.rs

opendal_service_moka/
backend.rs
