Add DB::open_cf_with_ttl method. (#505)

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Bump `librocksdb-sys` up to 6.13.3 (aleksuss)
 * Add `multi_get`, `multi_get_opt`, `multi_get_cf` and `multi_get_cf_opt` `DB` methods (stanislav-tkach)
 * Bump `librocksdb-sys` up to 6.17.3 (ordian)
+* Add `DB::open_cf_with_ttl` method (fdeantoni)
 
 ## 0.15.0 (2020-08-25)
 

src/db.rs

@@ -231,18 +231,43 @@ impl<T: ThreadMode> DBWithThreadMode<T> {
         path: P,
         ttl: Duration,
     ) -> Result<Self, Error> {
-        let c_path = to_cpath(&path)?;
-        let db = Self::open_raw(opts, &c_path, &AccessType::WithTTL { ttl })?;
-        if db.is_null() {
-            return Err(Error::new("Could not initialize database.".to_owned()));
+        Self::open_cf_descriptors_with_ttl(opts, path, std::iter::empty(), ttl)
     }
 
-        Ok(Self {
-            inner: db,
-            cfs: T::new(BTreeMap::new()),
-            path: path.as_ref().to_path_buf(),
-            _outlive: vec![opts.outlive.clone()],
-        })
+    /// Opens the database with a Time to Live compaction filter and column family names.
+    ///
+    /// Column families opened using this function will be created with default `Options`.    
+    pub fn open_cf_with_ttl<P, I, N>(
+        opts: &Options,
+        path: P,
+        cfs: I,
+        ttl: Duration,
+    ) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+        I: IntoIterator<Item = N>,
+        N: AsRef<str>,
+    {
+        let cfs = cfs
+            .into_iter()
+            .map(|name| ColumnFamilyDescriptor::new(name.as_ref(), Options::default()));
+
+        Self::open_cf_descriptors_with_ttl(opts, path, cfs, ttl)
+    }
+
+    /// Opens a database with the given database with a Time to Live compaction filter and
+    /// column family descriptors.
+    pub fn open_cf_descriptors_with_ttl<P, I>(
+        opts: &Options,
+        path: P,
+        cfs: I,
+        ttl: Duration,
+    ) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+        I: IntoIterator<Item = ColumnFamilyDescriptor>,
+    {
+        Self::open_cf_descriptors_internal(opts, path, cfs, &AccessType::WithTTL { ttl })
     }
 
     /// Opens a database with the given database options and column family names.
@@ -487,7 +512,17 @@ impl<T: ThreadMode> DBWithThreadMode<T> {
                         cfhandles.as_mut_ptr(),
                     ))
                 }
-                _ => return Err(Error::new("Unsupported access type".to_owned())),
+                AccessType::WithTTL { ttl } => {
+                    ffi_try!(ffi::rocksdb_open_column_families_with_ttl(
+                        opts.inner,
+                        cpath.as_ptr(),
+                        cfs_v.len() as c_int,
+                        cfnames.as_ptr(),
+                        cfopts.as_ptr(),
+                        cfhandles.as_mut_ptr(),
+                        &(ttl.as_secs() as c_int) as *const _,
+                    ))
+                }
             }
         };
         Ok(db)

tests/test_db.rs

@@ -529,6 +529,25 @@ fn test_open_with_ttl() {
     assert!(db.get(b"key1").unwrap().is_none());
 }
 
+#[test]
+fn test_open_cf_with_ttl() {
+    let path = DBPath::new("_rust_rocksdb_test_open_cf_with_ttl");
+
+    let mut opts = Options::default();
+    opts.create_if_missing(true);
+    opts.create_missing_column_families(true);
+    let db = DB::open_cf_with_ttl(&opts, &path, &["test_cf"], Duration::from_secs(1)).unwrap();
+    let cf = db.cf_handle("test_cf").unwrap();
+    db.put_cf(cf, b"key1", b"value1").unwrap();
+
+    thread::sleep(Duration::from_secs(2));
+    // Trigger a manual compaction, this will check the TTL filter
+    // in the database and drop all expired entries.
+    db.compact_range_cf(cf, None::<&[u8]>, None::<&[u8]>);
+
+    assert!(db.get_cf(cf, b"key1").unwrap().is_none());
+}
+
 #[test]
 fn test_open_as_single_threaded() {
     let primary_path = DBPath::new("_rust_rocksdb_test_open_as_single_threaded");