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-rw-r--r--third_party/rust/rkv/tests/env-safe.rs1370
1 files changed, 1370 insertions, 0 deletions
diff --git a/third_party/rust/rkv/tests/env-safe.rs b/third_party/rust/rkv/tests/env-safe.rs
new file mode 100644
index 0000000000..9c20e39507
--- /dev/null
+++ b/third_party/rust/rkv/tests/env-safe.rs
@@ -0,0 +1,1370 @@
+// Copyright 2018-2019 Mozilla
+//
+// 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.
+
+// TODO: change this back to `clippy::cognitive_complexity` when Clippy stable
+// deprecates `clippy::cyclomatic_complexity`.
+#![allow(clippy::complexity)]
+
+use std::{
+ fs,
+ path::Path,
+ str,
+ sync::{Arc, RwLock},
+ thread,
+};
+
+use byteorder::{ByteOrder, LittleEndian};
+use tempfile::Builder;
+
+use rkv::{
+ backend::{
+ BackendEnvironmentBuilder, SafeMode, SafeModeDatabase, SafeModeEnvironment,
+ SafeModeRwTransaction,
+ },
+ Rkv, SingleStore, StoreError, StoreOptions, Value, Writer,
+};
+
+fn check_rkv(k: &Rkv<SafeModeEnvironment>) {
+ let _ = k
+ .open_single(None, StoreOptions::create())
+ .expect("created default");
+
+ let s = k.open_single("s", StoreOptions::create()).expect("opened");
+ let reader = k.read().expect("reader");
+
+ let result = s.get(&reader, "foo");
+ assert_eq!(None, result.expect("success but no value"));
+}
+
+/// We can't open a directory that doesn't exist.
+#[test]
+fn test_open_fails_safe() {
+ let root = Builder::new()
+ .prefix("test_open_fails_safe")
+ .tempdir()
+ .expect("tempdir");
+ assert!(root.path().exists());
+
+ let nope = root.path().join("nope/");
+ assert!(!nope.exists());
+
+ let pb = nope.to_path_buf();
+ match Rkv::new::<SafeMode>(nope.as_path()).err() {
+ Some(StoreError::UnsuitableEnvironmentPath(p)) => {
+ assert_eq!(pb, p);
+ }
+ _ => panic!("expected error"),
+ };
+}
+
+#[test]
+fn test_open_safe() {
+ let root = Builder::new()
+ .prefix("test_open_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ check_rkv(&k);
+}
+
+#[test]
+fn test_open_from_builder_safe() {
+ let root = Builder::new()
+ .prefix("test_open_from_builder_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let mut builder = Rkv::environment_builder::<SafeMode>();
+ builder.set_max_dbs(2);
+
+ let k = Rkv::from_builder(root.path(), builder).expect("rkv");
+ check_rkv(&k);
+}
+
+#[test]
+fn test_open_from_builder_with_dir_safe_1() {
+ let root = Builder::new()
+ .prefix("test_open_from_builder_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+
+ let mut builder = Rkv::environment_builder::<SafeMode>();
+ builder.set_max_dbs(2);
+ builder.set_make_dir_if_needed(true);
+
+ let k = Rkv::from_builder(root.path(), builder).expect("rkv");
+ check_rkv(&k);
+}
+
+#[test]
+#[should_panic(expected = "rkv: UnsuitableEnvironmentPath(\"bogus\")")]
+fn test_open_from_builder_with_dir_safe_2() {
+ let root = Path::new("bogus");
+ println!("Root path: {root:?}");
+ assert!(!root.is_dir());
+
+ let mut builder = Rkv::environment_builder::<SafeMode>();
+ builder.set_max_dbs(2);
+
+ let k = Rkv::from_builder(root, builder).expect("rkv");
+ check_rkv(&k);
+}
+
+#[test]
+#[should_panic(expected = "opened: DbsFull")]
+fn test_create_with_capacity_safe_1() {
+ let root = Builder::new()
+ .prefix("test_create_with_capacity_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 1).expect("rkv");
+ check_rkv(&k);
+
+ // This errors with "opened: DbsFull" because we specified a capacity of one (database),
+ // and check_rkv already opened one (plus the default database, which doesn't count
+ // against the limit).
+ let _zzz = k
+ .open_single("zzz", StoreOptions::create())
+ .expect("opened");
+}
+
+#[test]
+fn test_create_with_capacity_safe_2() {
+ let root = Builder::new()
+ .prefix("test_create_with_capacity_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 1).expect("rkv");
+ check_rkv(&k);
+
+ // This doesn't error with "opened: DbsFull" because even though we specified a capacity
+ // of one (database), and check_rkv already opened one, the default database doesn't
+ // count against the limit).
+ let _zzz = k.open_single(None, StoreOptions::create()).expect("opened");
+}
+
+#[test]
+#[should_panic(expected = "opened: SafeModeError(DbNotFoundError)")]
+fn test_open_with_capacity_safe_1() {
+ let root = Builder::new()
+ .prefix("test_open_with_capacity_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 1).expect("rkv");
+ check_rkv(&k);
+
+ let _zzz = k
+ .open_single("zzz", StoreOptions::default())
+ .expect("opened");
+}
+
+#[test]
+fn test_open_with_capacity_safe_2() {
+ let root = Builder::new()
+ .prefix("test_open_with_capacity_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 1).expect("rkv");
+ check_rkv(&k);
+
+ let _zzz = k
+ .open_single(None, StoreOptions::default())
+ .expect("opened");
+}
+
+#[test]
+fn test_list_dbs_safe_1() {
+ let root = Builder::new()
+ .prefix("test_list_dbs_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 1).expect("rkv");
+ check_rkv(&k);
+
+ let mut dbs = k.get_dbs().unwrap();
+ dbs.sort();
+ assert_eq!(dbs, vec![None, Some("s".to_owned())]);
+}
+
+#[test]
+fn test_list_dbs_safe_2() {
+ let root = Builder::new()
+ .prefix("test_list_dbs_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 2).expect("rkv");
+ check_rkv(&k);
+
+ let _ = k
+ .open_single("zzz", StoreOptions::create())
+ .expect("opened");
+
+ let mut dbs = k.get_dbs().unwrap();
+ dbs.sort();
+ assert_eq!(
+ dbs,
+ vec![None, Some("s".to_owned()), Some("zzz".to_owned())]
+ );
+}
+
+#[test]
+fn test_list_dbs_safe_3() {
+ let root = Builder::new()
+ .prefix("test_list_dbs_safe")
+ .tempdir()
+ .expect("tempdir");
+ println!("Root path: {:?}", root.path());
+ fs::create_dir_all(root.path()).expect("dir created");
+ assert!(root.path().is_dir());
+
+ let k = Rkv::with_capacity::<SafeMode>(root.path(), 0).expect("rkv");
+
+ let _ = k.open_single(None, StoreOptions::create()).expect("opened");
+
+ let mut dbs = k.get_dbs().unwrap();
+ dbs.sort();
+ assert_eq!(dbs, vec![None]);
+}
+
+#[test]
+fn test_round_trip_and_transactions_safe() {
+ let root = Builder::new()
+ .prefix("test_round_trip_and_transactions_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ sk.put(&mut writer, "noo", &Value::F64(1234.0.into()))
+ .expect("wrote");
+ sk.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ sk.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ assert_eq!(
+ sk.get(&writer, "foo").expect("read"),
+ Some(Value::I64(1234))
+ );
+ assert_eq!(
+ sk.get(&writer, "noo").expect("read"),
+ Some(Value::F64(1234.0.into()))
+ );
+ assert_eq!(
+ sk.get(&writer, "bar").expect("read"),
+ Some(Value::Bool(true))
+ );
+ assert_eq!(
+ sk.get(&writer, "baz").expect("read"),
+ Some(Value::Str("héllo, yöu"))
+ );
+
+ // Isolation. Reads won't return values.
+ let r = &k.read().unwrap();
+ assert_eq!(sk.get(r, "foo").expect("read"), None);
+ assert_eq!(sk.get(r, "bar").expect("read"), None);
+ assert_eq!(sk.get(r, "baz").expect("read"), None);
+ }
+
+ // Dropped: tx rollback. Reads will still return nothing.
+
+ {
+ let r = &k.read().unwrap();
+ assert_eq!(sk.get(r, "foo").expect("read"), None);
+ assert_eq!(sk.get(r, "bar").expect("read"), None);
+ assert_eq!(sk.get(r, "baz").expect("read"), None);
+ }
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ sk.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ sk.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ assert_eq!(
+ sk.get(&writer, "foo").expect("read"),
+ Some(Value::I64(1234))
+ );
+ assert_eq!(
+ sk.get(&writer, "bar").expect("read"),
+ Some(Value::Bool(true))
+ );
+ assert_eq!(
+ sk.get(&writer, "baz").expect("read"),
+ Some(Value::Str("héllo, yöu"))
+ );
+
+ writer.commit().expect("committed");
+ }
+
+ // Committed. Reads will succeed.
+
+ {
+ let r = k.read().unwrap();
+ assert_eq!(sk.get(&r, "foo").expect("read"), Some(Value::I64(1234)));
+ assert_eq!(sk.get(&r, "bar").expect("read"), Some(Value::Bool(true)));
+ assert_eq!(
+ sk.get(&r, "baz").expect("read"),
+ Some(Value::Str("héllo, yöu"))
+ );
+ }
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.delete(&mut writer, "foo").expect("deleted");
+ sk.delete(&mut writer, "bar").expect("deleted");
+ sk.delete(&mut writer, "baz").expect("deleted");
+ assert_eq!(sk.get(&writer, "foo").expect("read"), None);
+ assert_eq!(sk.get(&writer, "bar").expect("read"), None);
+ assert_eq!(sk.get(&writer, "baz").expect("read"), None);
+
+ // Isolation. Reads still return values.
+ let r = k.read().unwrap();
+ assert_eq!(sk.get(&r, "foo").expect("read"), Some(Value::I64(1234)));
+ assert_eq!(sk.get(&r, "bar").expect("read"), Some(Value::Bool(true)));
+ assert_eq!(
+ sk.get(&r, "baz").expect("read"),
+ Some(Value::Str("héllo, yöu"))
+ );
+ }
+
+ // Dropped: tx rollback. Reads will still return values.
+
+ {
+ let r = k.read().unwrap();
+ assert_eq!(sk.get(&r, "foo").expect("read"), Some(Value::I64(1234)));
+ assert_eq!(sk.get(&r, "bar").expect("read"), Some(Value::Bool(true)));
+ assert_eq!(
+ sk.get(&r, "baz").expect("read"),
+ Some(Value::Str("héllo, yöu"))
+ );
+ }
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.delete(&mut writer, "foo").expect("deleted");
+ sk.delete(&mut writer, "bar").expect("deleted");
+ sk.delete(&mut writer, "baz").expect("deleted");
+ assert_eq!(sk.get(&writer, "foo").expect("read"), None);
+ assert_eq!(sk.get(&writer, "bar").expect("read"), None);
+ assert_eq!(sk.get(&writer, "baz").expect("read"), None);
+
+ writer.commit().expect("committed");
+ }
+
+ // Committed. Reads will succeed but return None to indicate a missing value.
+
+ {
+ let r = k.read().unwrap();
+ assert_eq!(sk.get(&r, "foo").expect("read"), None);
+ assert_eq!(sk.get(&r, "bar").expect("read"), None);
+ assert_eq!(sk.get(&r, "baz").expect("read"), None);
+ }
+}
+
+#[test]
+fn test_single_store_clear_safe() {
+ let root = Builder::new()
+ .prefix("test_single_store_clear_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ sk.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ sk.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+ }
+
+ {
+ let mut writer = k.write().expect("writer");
+ sk.clear(&mut writer).expect("cleared");
+ writer.commit().expect("committed");
+ }
+
+ {
+ let r = k.read().unwrap();
+ let iter = sk.iter_start(&r).expect("iter");
+ assert_eq!(iter.count(), 0);
+ }
+}
+
+#[test]
+#[should_panic(expected = "KeyValuePairNotFound")]
+fn test_single_store_delete_nonexistent_safe() {
+ let root = Builder::new()
+ .prefix("test_single_store_delete_nonexistent_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ let mut writer = k.write().expect("writer");
+ sk.delete(&mut writer, "bogus").unwrap();
+}
+
+#[test]
+#[cfg(feature = "db-dup-sort")]
+fn test_multi_put_get_del_safe() {
+ let root = Builder::new()
+ .prefix("test_multi_put_get_del_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let multistore = k.open_multi("multistore", StoreOptions::create()).unwrap();
+
+ let mut writer = k.write().unwrap();
+ multistore
+ .put(&mut writer, "str1", &Value::Str("str1 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str1", &Value::Str("str1 bar"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str2", &Value::Str("str2 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str2", &Value::Str("str2 bar"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str3", &Value::Str("str3 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str3", &Value::Str("str3 bar"))
+ .unwrap();
+ writer.commit().unwrap();
+
+ let writer = k.write().unwrap();
+ {
+ let mut iter = multistore.get(&writer, "str1").unwrap();
+ let (id, val) = iter.next().unwrap().unwrap();
+ assert_eq!((id, val), (&b"str1"[..], Value::Str("str1 bar")));
+ let (id, val) = iter.next().unwrap().unwrap();
+ assert_eq!((id, val), (&b"str1"[..], Value::Str("str1 foo")));
+ }
+ writer.commit().unwrap();
+
+ let mut writer = k.write().unwrap();
+ multistore
+ .delete(&mut writer, "str1", &Value::Str("str1 foo"))
+ .unwrap();
+ assert_eq!(
+ multistore.get_first(&writer, "str1").unwrap(),
+ Some(Value::Str("str1 bar"))
+ );
+ multistore
+ .delete(&mut writer, "str2", &Value::Str("str2 bar"))
+ .unwrap();
+ assert_eq!(
+ multistore.get_first(&writer, "str2").unwrap(),
+ Some(Value::Str("str2 foo"))
+ );
+ multistore.delete_all(&mut writer, "str3").unwrap();
+ assert_eq!(multistore.get_first(&writer, "str3").unwrap(), None);
+ writer.commit().unwrap();
+}
+
+#[test]
+#[cfg(feature = "db-dup-sort")]
+fn test_multiple_store_clear_safe() {
+ let root = Builder::new()
+ .prefix("test_multiple_store_clear_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let multistore = k
+ .open_multi("multistore", StoreOptions::create())
+ .expect("opened");
+
+ {
+ let mut writer = k.write().expect("writer");
+ multistore
+ .put(&mut writer, "str1", &Value::Str("str1 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str1", &Value::Str("str1 bar"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str2", &Value::Str("str2 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str2", &Value::Str("str2 bar"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str3", &Value::Str("str3 foo"))
+ .unwrap();
+ multistore
+ .put(&mut writer, "str3", &Value::Str("str3 bar"))
+ .unwrap();
+ writer.commit().expect("committed");
+ }
+
+ {
+ let mut writer = k.write().expect("writer");
+ multistore.clear(&mut writer).expect("cleared");
+ writer.commit().expect("committed");
+ }
+
+ {
+ let r = k.read().unwrap();
+ assert_eq!(multistore.get_first(&r, "str1").expect("read"), None);
+ assert_eq!(multistore.get_first(&r, "str2").expect("read"), None);
+ assert_eq!(multistore.get_first(&r, "str3").expect("read"), None);
+ }
+}
+
+#[test]
+fn test_open_store_for_read_safe() {
+ let root = Builder::new()
+ .prefix("test_open_store_for_read_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+
+ // First create the store, and start a write transaction on it.
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::Str("bar"))
+ .expect("write");
+
+ // Open the same store for read, note that the write transaction is still in progress,
+ // it should not block the reader though.
+ let sk_readonly = k
+ .open_single("sk", StoreOptions::default())
+ .expect("opened");
+ writer.commit().expect("commit");
+
+ // Now the write transaction is committed, any followed reads should see its change.
+ let reader = k.read().expect("reader");
+ assert_eq!(
+ sk_readonly.get(&reader, "foo").expect("read"),
+ Some(Value::Str("bar"))
+ );
+}
+
+#[test]
+#[should_panic(expected = "open a missing store")]
+fn test_open_a_missing_store_safe() {
+ let root = Builder::new()
+ .prefix("test_open_a_missing_store_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let _sk = k
+ .open_single("sk", StoreOptions::default())
+ .expect("open a missing store");
+}
+
+#[test]
+#[should_panic(expected = "new failed: FileInvalid")]
+fn test_open_a_broken_store_safe() {
+ let root = Builder::new()
+ .prefix("test_open_a_missing_store_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let dbfile = root.path().join("data.safe.bin");
+ fs::write(dbfile, "bogus").expect("dbfile created");
+
+ let _ = Rkv::new::<SafeMode>(root.path()).expect("new failed");
+}
+
+#[test]
+fn test_open_fail_with_badrslot_safe() {
+ let root = Builder::new()
+ .prefix("test_open_fail_with_badrslot_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+
+ // First create the store
+ let _sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ // Open a reader on this store
+ let _reader = k.read().expect("reader");
+
+ // Open the same store for read while the reader is in progress will panic
+ let store = k.open_single("sk", StoreOptions::default());
+ match store {
+ Err(StoreError::OpenAttemptedDuringTransaction(_thread_id)) => (),
+ _ => panic!("should panic"),
+ }
+}
+
+#[test]
+fn test_create_fail_with_badrslot_safe() {
+ let root = Builder::new()
+ .prefix("test_create_fail_with_badrslot_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+
+ // First create the store
+ let _sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ // Open a reader on this store
+ let _reader = k.read().expect("reader");
+
+ // Open the same store for read while the reader is in progress will panic
+ let store = k.open_single("sk", StoreOptions::create());
+ match store {
+ Err(StoreError::OpenAttemptedDuringTransaction(_thread_id)) => (),
+ _ => panic!("should panic"),
+ }
+}
+
+#[test]
+fn test_read_before_write_num_safe() {
+ let root = Builder::new()
+ .prefix("test_read_before_write_num_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ // Test reading a number, modifying it, and then writing it back.
+ // We have to be done with the Value::I64 before calling Writer::put,
+ // as the Value::I64 borrows an immutable reference to the Writer.
+ // So we extract and copy its primitive value.
+
+ fn get_existing_foo(
+ store: SingleStore<SafeModeDatabase>,
+ writer: &Writer<SafeModeRwTransaction>,
+ ) -> Option<i64> {
+ match store.get(writer, "foo").expect("read") {
+ Some(Value::I64(val)) => Some(val),
+ _ => None,
+ }
+ }
+
+ let mut writer = k.write().expect("writer");
+ let mut existing = get_existing_foo(sk, &writer).unwrap_or(99);
+ existing += 1;
+ sk.put(&mut writer, "foo", &Value::I64(existing))
+ .expect("success");
+
+ let updated = get_existing_foo(sk, &writer).unwrap_or(99);
+ assert_eq!(updated, 100);
+ writer.commit().expect("commit");
+}
+
+#[test]
+fn test_read_before_write_str_safe() {
+ let root = Builder::new()
+ .prefix("test_read_before_write_str_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ // Test reading a string, modifying it, and then writing it back.
+ // We have to be done with the Value::Str before calling Writer::put,
+ // as the Value::Str (and its underlying &str) borrows an immutable
+ // reference to the Writer. So we copy it to a String.
+
+ fn get_existing_foo(
+ store: SingleStore<SafeModeDatabase>,
+ writer: &Writer<SafeModeRwTransaction>,
+ ) -> Option<String> {
+ match store.get(writer, "foo").expect("read") {
+ Some(Value::Str(val)) => Some(val.to_string()),
+ _ => None,
+ }
+ }
+
+ let mut writer = k.write().expect("writer");
+ let mut existing = get_existing_foo(sk, &writer).unwrap_or_default();
+ existing.push('…');
+ sk.put(&mut writer, "foo", &Value::Str(&existing))
+ .expect("write");
+
+ let updated = get_existing_foo(sk, &writer).unwrap_or_default();
+ assert_eq!(updated, "…");
+ writer.commit().expect("commit");
+}
+
+#[test]
+fn test_isolation_safe() {
+ let root = Builder::new()
+ .prefix("test_isolation_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let s = k.open_single("s", StoreOptions::create()).expect("opened");
+
+ // Add one field.
+ {
+ let mut writer = k.write().expect("writer");
+ s.put(&mut writer, "foo", &Value::I64(1234)).expect("wrote");
+ writer.commit().expect("committed");
+ }
+
+ {
+ let reader = k.read().unwrap();
+ assert_eq!(s.get(&reader, "foo").expect("read"), Some(Value::I64(1234)));
+ }
+
+ // Establish a long-lived reader that outlasts a writer.
+ let reader = k.read().expect("reader");
+ assert_eq!(s.get(&reader, "foo").expect("read"), Some(Value::I64(1234)));
+
+ // Start a write transaction.
+ let mut writer = k.write().expect("writer");
+ s.put(&mut writer, "foo", &Value::I64(999)).expect("wrote");
+
+ // The reader and writer are isolated.
+ assert_eq!(s.get(&reader, "foo").expect("read"), Some(Value::I64(1234)));
+ assert_eq!(s.get(&writer, "foo").expect("read"), Some(Value::I64(999)));
+
+ // If we commit the writer, we still have isolation.
+ writer.commit().expect("committed");
+ assert_eq!(s.get(&reader, "foo").expect("read"), Some(Value::I64(1234)));
+
+ // A new reader sees the committed value. Note that LMDB doesn't allow two
+ // read transactions to exist in the same thread, so we abort the previous one.
+ reader.abort();
+ let reader = k.read().expect("reader");
+ assert_eq!(s.get(&reader, "foo").expect("read"), Some(Value::I64(999)));
+}
+
+#[test]
+fn test_blob_safe() {
+ let root = Builder::new()
+ .prefix("test_round_trip_blob_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ let mut writer = k.write().expect("writer");
+ assert_eq!(sk.get(&writer, "foo").expect("read"), None);
+ sk.put(&mut writer, "foo", &Value::Blob(&[1, 2, 3, 4]))
+ .expect("wrote");
+ assert_eq!(
+ sk.get(&writer, "foo").expect("read"),
+ Some(Value::Blob(&[1, 2, 3, 4]))
+ );
+
+ fn u16_to_u8(src: &[u16]) -> Vec<u8> {
+ let mut dst = vec![0; 2 * src.len()];
+ LittleEndian::write_u16_into(src, &mut dst);
+ dst
+ }
+
+ fn u8_to_u16(src: &[u8]) -> Vec<u16> {
+ let mut dst = vec![0; src.len() / 2];
+ LittleEndian::read_u16_into(src, &mut dst);
+ dst
+ }
+
+ // When storing UTF-16 strings as blobs, we'll need to convert
+ // their [u16] backing storage to [u8]. Test that converting, writing,
+ // reading, and converting back works as expected.
+ let u16_array = [1000, 10000, 54321, 65535];
+ assert_eq!(sk.get(&writer, "bar").expect("read"), None);
+ sk.put(&mut writer, "bar", &Value::Blob(&u16_to_u8(&u16_array)))
+ .expect("wrote");
+ let u8_array = match sk.get(&writer, "bar").expect("read") {
+ Some(Value::Blob(val)) => val,
+ _ => &[],
+ };
+ assert_eq!(u8_to_u16(u8_array), u16_array);
+}
+
+#[test]
+fn test_sync_safe() {
+ let root = Builder::new()
+ .prefix("test_sync_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let mut builder = Rkv::environment_builder::<SafeMode>();
+ builder.set_max_dbs(1);
+ {
+ let k = Rkv::from_builder(root.path(), builder).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+ {
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ writer.commit().expect("committed");
+ k.sync(true).expect("synced");
+ }
+ }
+ let k = Rkv::from_builder(root.path(), builder).expect("new succeeded");
+ let sk = k
+ .open_single("sk", StoreOptions::default())
+ .expect("opened");
+ let reader = k.read().expect("reader");
+ assert_eq!(
+ sk.get(&reader, "foo").expect("read"),
+ Some(Value::I64(1234))
+ );
+}
+
+#[test]
+fn test_iter_safe() {
+ let root = Builder::new()
+ .prefix("test_iter_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ // An iterator over an empty store returns no values.
+ {
+ let reader = k.read().unwrap();
+ let mut iter = sk.iter_start(&reader).unwrap();
+ assert!(iter.next().is_none());
+ }
+
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ sk.put(&mut writer, "noo", &Value::F64(1234.0.into()))
+ .expect("wrote");
+ sk.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ sk.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ sk.put(&mut writer, "héllò, töűrîst", &Value::Str("Emil.RuleZ!"))
+ .expect("wrote");
+ sk.put(&mut writer, "你好，遊客", &Value::Str("米克規則"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+
+ let reader = k.read().unwrap();
+
+ // Reader.iter() returns (key, value) tuples ordered by key.
+ let mut iter = sk.iter_start(&reader).unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "bar");
+ assert_eq!(val, Value::Bool(true));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "baz");
+ assert_eq!(val, Value::Str("héllo, yöu"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "foo");
+ assert_eq!(val, Value::I64(1234));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "héllò, töűrîst");
+ assert_eq!(val, Value::Str("Emil.RuleZ!"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterators don't loop. Once one returns None, additional calls
+ // to its next() method will always return None.
+ assert!(iter.next().is_none());
+
+ // Reader.iter_from() begins iteration at the first key equal to
+ // or greater than the given key.
+ let mut iter = sk.iter_from(&reader, "moo").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Reader.iter_from() works as expected when the given key is a prefix
+ // of a key in the store.
+ let mut iter = sk.iter_from(&reader, "no").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+}
+
+#[test]
+fn test_iter_from_key_greater_than_existing_safe() {
+ let root = Builder::new()
+ .prefix("test_iter_from_key_greater_than_existing_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let sk = k.open_single("sk", StoreOptions::create()).expect("opened");
+
+ let mut writer = k.write().expect("writer");
+ sk.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ sk.put(&mut writer, "noo", &Value::F64(1234.0.into()))
+ .expect("wrote");
+ sk.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ sk.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+
+ let reader = k.read().unwrap();
+ let mut iter = sk.iter_from(&reader, "nuu").unwrap();
+ assert!(iter.next().is_none());
+}
+
+#[test]
+fn test_multiple_store_read_write_safe() {
+ let root = Builder::new()
+ .prefix("test_multiple_store_read_write_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let s1 = k
+ .open_single("store_1", StoreOptions::create())
+ .expect("opened");
+ let s2 = k
+ .open_single("store_2", StoreOptions::create())
+ .expect("opened");
+ let s3 = k
+ .open_single("store_3", StoreOptions::create())
+ .expect("opened");
+
+ let mut writer = k.write().expect("writer");
+ s1.put(&mut writer, "foo", &Value::Str("bar"))
+ .expect("wrote");
+ s2.put(&mut writer, "foo", &Value::I64(123)).expect("wrote");
+ s3.put(&mut writer, "foo", &Value::Bool(true))
+ .expect("wrote");
+
+ assert_eq!(
+ s1.get(&writer, "foo").expect("read"),
+ Some(Value::Str("bar"))
+ );
+ assert_eq!(s2.get(&writer, "foo").expect("read"), Some(Value::I64(123)));
+ assert_eq!(
+ s3.get(&writer, "foo").expect("read"),
+ Some(Value::Bool(true))
+ );
+
+ writer.commit().expect("committed");
+
+ let reader = k.read().expect("unbound_reader");
+ assert_eq!(
+ s1.get(&reader, "foo").expect("read"),
+ Some(Value::Str("bar"))
+ );
+ assert_eq!(s2.get(&reader, "foo").expect("read"), Some(Value::I64(123)));
+ assert_eq!(
+ s3.get(&reader, "foo").expect("read"),
+ Some(Value::Bool(true))
+ );
+ reader.abort();
+
+ // test delete across multiple stores
+ let mut writer = k.write().expect("writer");
+ s1.delete(&mut writer, "foo").expect("deleted");
+ s2.delete(&mut writer, "foo").expect("deleted");
+ s3.delete(&mut writer, "foo").expect("deleted");
+ writer.commit().expect("committed");
+
+ let reader = k.read().expect("reader");
+ assert_eq!(s1.get(&reader, "key").expect("value"), None);
+ assert_eq!(s2.get(&reader, "key").expect("value"), None);
+ assert_eq!(s3.get(&reader, "key").expect("value"), None);
+}
+
+#[test]
+fn test_multiple_store_iter_safe() {
+ let root = Builder::new()
+ .prefix("test_multiple_store_iter_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let k = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let s1 = k
+ .open_single("store_1", StoreOptions::create())
+ .expect("opened");
+ let s2 = k
+ .open_single("store_2", StoreOptions::create())
+ .expect("opened");
+
+ let mut writer = k.write().expect("writer");
+ // Write to "s1"
+ s1.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ s1.put(&mut writer, "noo", &Value::F64(1234.0.into()))
+ .expect("wrote");
+ s1.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ s1.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ s1.put(&mut writer, "héllò, töűrîst", &Value::Str("Emil.RuleZ!"))
+ .expect("wrote");
+ s1.put(&mut writer, "你好，遊客", &Value::Str("米克規則"))
+ .expect("wrote");
+ // &mut writer to "s2"
+ s2.put(&mut writer, "foo", &Value::I64(1234))
+ .expect("wrote");
+ s2.put(&mut writer, "noo", &Value::F64(1234.0.into()))
+ .expect("wrote");
+ s2.put(&mut writer, "bar", &Value::Bool(true))
+ .expect("wrote");
+ s2.put(&mut writer, "baz", &Value::Str("héllo, yöu"))
+ .expect("wrote");
+ s2.put(&mut writer, "héllò, töűrîst", &Value::Str("Emil.RuleZ!"))
+ .expect("wrote");
+ s2.put(&mut writer, "你好，遊客", &Value::Str("米克規則"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+
+ let reader = k.read().unwrap();
+
+ // Iterate through the whole store in "s1"
+ let mut iter = s1.iter_start(&reader).unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "bar");
+ assert_eq!(val, Value::Bool(true));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "baz");
+ assert_eq!(val, Value::Str("héllo, yöu"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "foo");
+ assert_eq!(val, Value::I64(1234));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "héllò, töűrîst");
+ assert_eq!(val, Value::Str("Emil.RuleZ!"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterate through the whole store in "s2"
+ let mut iter = s2.iter_start(&reader).unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "bar");
+ assert_eq!(val, Value::Bool(true));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "baz");
+ assert_eq!(val, Value::Str("héllo, yöu"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "foo");
+ assert_eq!(val, Value::I64(1234));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "héllò, töűrîst");
+ assert_eq!(val, Value::Str("Emil.RuleZ!"));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterate from a given key in "s1"
+ let mut iter = s1.iter_from(&reader, "moo").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterate from a given key in "s2"
+ let mut iter = s2.iter_from(&reader, "moo").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterate from a given prefix in "s1"
+ let mut iter = s1.iter_from(&reader, "no").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+
+ // Iterate from a given prefix in "s2"
+ let mut iter = s2.iter_from(&reader, "no").unwrap();
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "noo");
+ assert_eq!(val, Value::F64(1234.0.into()));
+ let (key, val) = iter.next().unwrap().unwrap();
+ assert_eq!(str::from_utf8(key).expect("key"), "你好，遊客");
+ assert_eq!(val, Value::Str("米克規則"));
+ assert!(iter.next().is_none());
+}
+
+#[test]
+fn test_store_multiple_thread_safe() {
+ let root = Builder::new()
+ .prefix("test_multiple_thread_safe")
+ .tempdir()
+ .expect("tempdir");
+ fs::create_dir_all(root.path()).expect("dir created");
+
+ let rkv_arc = Arc::new(RwLock::new(
+ Rkv::new::<SafeMode>(root.path()).expect("new succeeded"),
+ ));
+ let store = rkv_arc
+ .read()
+ .unwrap()
+ .open_single("test", StoreOptions::create())
+ .expect("opened");
+
+ let num_threads = 10;
+ let mut write_handles = Vec::with_capacity(num_threads as usize);
+ let mut read_handles = Vec::with_capacity(num_threads as usize);
+
+ // Note that this isn't intended to demonstrate a good use of threads.
+ // For this shape of data, it would be more performant to write/read
+ // all values using one transaction in a single thread. The point here
+ // is just to confirm that a store can be shared by multiple threads.
+
+ // For each KV pair, spawn a thread that writes it to the store.
+ for i in 0..num_threads {
+ let rkv_arc = rkv_arc.clone();
+ write_handles.push(thread::spawn(move || {
+ let rkv = rkv_arc.write().expect("rkv");
+ let mut writer = rkv.write().expect("writer");
+ store
+ .put(&mut writer, i.to_string(), &Value::U64(i))
+ .expect("written");
+ writer.commit().unwrap();
+ }));
+ }
+ for handle in write_handles {
+ handle.join().expect("joined");
+ }
+
+ // For each KV pair, spawn a thread that reads it from the store
+ // and returns its value.
+ for i in 0..num_threads {
+ let rkv_arc = rkv_arc.clone();
+ read_handles.push(thread::spawn(move || {
+ let rkv = rkv_arc.read().expect("rkv");
+ let reader = rkv.read().expect("reader");
+ let value = match store.get(&reader, i.to_string()) {
+ Ok(Some(Value::U64(value))) => value,
+ Ok(Some(_)) => panic!("value type unexpected"),
+ Ok(None) => panic!("value not found"),
+ Err(err) => panic!("{}", err),
+ };
+ assert_eq!(value, i);
+ value
+ }));
+ }
+
+ // Sum the values returned from the threads and confirm that they're
+ // equal to the sum of values written to the threads.
+ let thread_sum: u64 = read_handles
+ .into_iter()
+ .map(|handle| handle.join().expect("value"))
+ .sum();
+ assert_eq!(thread_sum, (0..num_threads).sum());
+}
+
+#[test]
+fn test_use_value_as_key_safe() {
+ let root = Builder::new()
+ .prefix("test_use_value_as_key_safe")
+ .tempdir()
+ .expect("tempdir");
+ let rkv = Rkv::new::<SafeMode>(root.path()).expect("new succeeded");
+ let store = rkv
+ .open_single("store", StoreOptions::create())
+ .expect("opened");
+
+ {
+ let mut writer = rkv.write().expect("writer");
+ store
+ .put(&mut writer, "foo", &Value::Str("bar"))
+ .expect("wrote");
+ store
+ .put(&mut writer, "bar", &Value::Str("baz"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+ }
+
+ // It's possible to retrieve a value with a Reader and then use it
+ // as a key with a Writer.
+ {
+ let reader = &rkv.read().unwrap();
+ if let Some(Value::Str(key)) = store.get(reader, "foo").expect("read") {
+ let mut writer = rkv.write().expect("writer");
+ store.delete(&mut writer, key).expect("deleted");
+ writer.commit().expect("committed");
+ }
+ }
+
+ {
+ let mut writer = rkv.write().expect("writer");
+ store
+ .put(&mut writer, "bar", &Value::Str("baz"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+ }
+
+ // You can also retrieve a Value with a Writer and then use it as a key
+ // with the same Writer if you copy the value to an owned type
+ // so the Writer isn't still being borrowed by the retrieved value
+ // when you try to borrow the Writer again to modify that value.
+ {
+ let mut writer = rkv.write().expect("writer");
+ if let Some(Value::Str(value)) = store.get(&writer, "foo").expect("read") {
+ let key = value.to_owned();
+ store.delete(&mut writer, key).expect("deleted");
+ writer.commit().expect("committed");
+ }
+ }
+
+ {
+ let name1 = rkv
+ .open_single("name1", StoreOptions::create())
+ .expect("opened");
+ let name2 = rkv
+ .open_single("name2", StoreOptions::create())
+ .expect("opened");
+ let mut writer = rkv.write().expect("writer");
+ name1
+ .put(&mut writer, "key1", &Value::Str("bar"))
+ .expect("wrote");
+ name1
+ .put(&mut writer, "bar", &Value::Str("baz"))
+ .expect("wrote");
+ name2
+ .put(&mut writer, "key2", &Value::Str("bar"))
+ .expect("wrote");
+ name2
+ .put(&mut writer, "bar", &Value::Str("baz"))
+ .expect("wrote");
+ writer.commit().expect("committed");
+ }
+
+ // You can also iterate (store, key) pairs to retrieve foreign keys,
+ // then iterate those foreign keys to modify/delete them.
+ //
+ // You need to open the stores in advance, since opening a store
+ // uses a write transaction internally, so opening them while a writer
+ // is extant will hang.
+ //
+ // And you need to copy the values to an owned type so the Writer isn't
+ // still being borrowed by a retrieved value when you try to borrow
+ // the Writer again to modify another value.
+ let fields = vec![
+ (
+ rkv.open_single("name1", StoreOptions::create())
+ .expect("opened"),
+ "key1",
+ ),
+ (
+ rkv.open_single("name2", StoreOptions::create())
+ .expect("opened"),
+ "key2",
+ ),
+ ];
+ {
+ let mut foreignkeys = Vec::new();
+ let mut writer = rkv.write().expect("writer");
+ for (store, key) in fields.iter() {
+ if let Some(Value::Str(value)) = store.get(&writer, key).expect("read") {
+ foreignkeys.push((store, value.to_owned()));
+ }
+ }
+ for (store, key) in foreignkeys.iter() {
+ store.delete(&mut writer, key).expect("deleted");
+ }
+ writer.commit().expect("committed");
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 20:03:58 +0000