Improve safety of borrow checker with ffi objects

src/comparator.rs

@@ -20,7 +20,7 @@ use std::mem;
 use std::ptr;
 use std::slice;
 
-use rocksdb_options::RocksDBOptions;
+use rocksdb_options::Options;
 use rocksdb::RocksDB;
 
 pub struct ComparatorCallback {
@@ -69,11 +69,11 @@ fn test_reverse_compare(a: &[u8], b: &[u8]) -> c_int {
 #[test]
 fn compare_works() {
     let path = "_rust_rocksdb_comparetest";
-    let opts = RocksDBOptions::new();
+    let mut opts = Options::new();
     opts.create_if_missing(true);
     opts.add_comparator("test comparator", test_reverse_compare);
-    let db = RocksDB::open(opts, path).unwrap();
+    let db = RocksDB::open(&opts, path).unwrap();
     // TODO add interesting test
     db.close();
-    assert!(RocksDB::destroy(opts, path).is_ok());
+    assert!(RocksDB::destroy(&opts, path).is_ok());
 }

src/ffi.rs

@@ -92,14 +92,15 @@ pub enum RocksDBUniversalCompactionStyle {
     rocksdb_total_size_compaction_stop_style   = 1
 }
 
+//TODO audit the use of boolean arguments, b/c I think they need to be u8 instead...
 #[link(name = "rocksdb")]
 extern {
     pub fn rocksdb_options_create() -> RocksDBOptions;
+    pub fn rocksdb_options_destroy(opts: RocksDBOptions);
     pub fn rocksdb_cache_create_lru(capacity: size_t) -> RocksDBCache;
     pub fn rocksdb_cache_destroy(cache: RocksDBCache);
     pub fn rocksdb_block_based_options_create() -> RocksDBBlockBasedTableOptions;
-    pub fn rocksdb_block_based_options_destroy(
-        block_options: RocksDBBlockBasedTableOptions);
+    pub fn rocksdb_block_based_options_destroy(opts: RocksDBBlockBasedTableOptions);
     pub fn rocksdb_block_based_options_set_block_size(
         block_options: RocksDBBlockBasedTableOptions,
         block_size: size_t);
@@ -191,8 +192,26 @@ extern {
                        err: *mut i8);
     pub fn rocksdb_readoptions_create() -> RocksDBReadOptions;
     pub fn rocksdb_readoptions_destroy(readopts: RocksDBReadOptions);
-    pub fn rocksdb_readoptions_set_snapshot(read_opts: RocksDBReadOptions,
-                                            snapshot: RocksDBSnapshot);
+    pub fn rocksdb_readoptions_set_verify_checksums(
+            readopts: RocksDBReadOptions,
+            v: bool);
+    pub fn rocksdb_readoptions_set_fill_cache(
+            readopts: RocksDBReadOptions,
+            v: bool);
+    pub fn rocksdb_readoptions_set_snapshot(
+            readopts: RocksDBReadOptions,
+            snapshot: RocksDBSnapshot); //TODO how do I make this a const ref?
+    pub fn rocksdb_readoptions_set_iterate_upper_bound(
+            readopts: RocksDBReadOptions,
+            k: *const u8,
+            kLen: size_t);
+    pub fn rocksdb_readoptions_set_read_tier(
+            readopts: RocksDBReadOptions,
+            tier: c_int);
+    pub fn rocksdb_readoptions_set_tailing(
+            readopts: RocksDBReadOptions,
+            v: bool);
+
     pub fn rocksdb_get(db: RocksDBInstance,
                        readopts: RocksDBReadOptions,
                        k: *const u8, kLen: size_t,

src/lib.rs

@@ -38,7 +38,8 @@ pub use rocksdb::{
     Writable,
 };
 pub use rocksdb_options::{
-    RocksDBOptions,
+    Options,
+    BlockBasedOptions,
 };
 pub use merge_operator::{
     MergeOperands,

src/main.rs

@@ -17,7 +17,7 @@
 
 extern crate rocksdb;
 extern crate test;
-use rocksdb::{RocksDBOptions, RocksDB, MergeOperands, new_bloom_filter, Writable};
+use rocksdb::{Options, RocksDB, MergeOperands, new_bloom_filter, Writable};
 use rocksdb::RocksDBCompactionStyle::RocksDBUniversalCompaction;
 
 #[cfg(not(feature = "valgrind"))]
@@ -57,10 +57,10 @@ fn concat_merge(new_key: &[u8], existing_val: Option<&[u8]>,
 
 fn custom_merge() {
     let path = "_rust_rocksdb_mergetest";
-    let opts = RocksDBOptions::new();
+    let mut opts = Options::new();
     opts.create_if_missing(true);
     opts.add_merge_operator("test operator", concat_merge);
-    let db = RocksDB::open(opts, path).unwrap();
+    let db = RocksDB::open(&opts, path).unwrap();
     db.put(b"k1", b"a");
     db.merge(b"k1", b"b");
     db.merge(b"k1", b"c");
@@ -79,16 +79,16 @@ fn custom_merge() {
         .on_error( |e| { println!("error retrieving value: {}", e) });
 
     db.close();
-    RocksDB::destroy(opts, path).is_ok();
+    RocksDB::destroy(&opts, path).is_ok();
 }
 
 #[cfg(feature = "valgrind")]
 fn main() {
     let path = "_rust_rocksdb_valgrind";
-    let opts = RocksDBOptions::new();
+    let mut opts = Options::new();
     opts.create_if_missing(true);
     opts.add_merge_operator("test operator", concat_merge);
-    let db = RocksDB::open(opts, path).unwrap();
+    let db = RocksDB::open(&opts, path).unwrap();
     loop {
         db.put(b"k1", b"a");
         db.merge(b"k1", b"b");
@@ -114,12 +114,11 @@ mod tests  {
     use test::Bencher;
     use std::thread::sleep_ms;
 
-    use rocksdb::{RocksDBOptions, RocksDB, MergeOperands, new_bloom_filter, Writable};
+    use rocksdb::{BlockBasedOptions, Options, RocksDB, MergeOperands, new_bloom_filter, Writable};
     use rocksdb::RocksDBCompactionStyle::RocksDBUniversalCompaction;
 
-    fn tuned_for_somebody_elses_disk(path: &str, opts: RocksDBOptions) -> RocksDB {
+    fn tuned_for_somebody_elses_disk(path: &str, opts: &mut Options, blockopts: &mut BlockBasedOptions) -> RocksDB {
         opts.create_if_missing(true);
-        opts.set_block_size(524288);
         opts.set_max_open_files(10000);
         opts.set_use_fsync(false);
         opts.set_bytes_per_sync(8388608);
@@ -136,12 +135,14 @@ mod tests  {
         opts.set_max_background_compactions(4);
         opts.set_max_background_flushes(4);
         opts.set_filter_deletes(false);
+        blockopts.set_block_size(524288);
+        opts.set_block_based_table_factory(blockopts);
         opts.set_disable_auto_compactions(true);
 
         let filter = new_bloom_filter(10);
-        opts.set_filter(filter);
+        //opts.set_filter(filter);
 
-        RocksDB::open(opts, path).unwrap()
+        RocksDB::open(&opts, path).unwrap()
     }
 
     #[bench]
@@ -149,8 +150,9 @@ mod tests  {
         // dirty hack due to parallel tests causing contention.
         sleep_ms(1000);
         let path = "_rust_rocksdb_optimizetest";
-        let opts = RocksDBOptions::new();
-        let db = tuned_for_somebody_elses_disk(path, opts);
+        let mut opts = Options::new();
+        let mut blockopts = BlockBasedOptions::new();
+        let db = tuned_for_somebody_elses_disk(path, &mut opts, &mut blockopts);
         let mut i = 0 as u64;
         b.iter(|| {
             db.put(i.to_string().as_bytes(), b"v1111");
@@ -162,8 +164,9 @@ mod tests  {
     #[bench]
     fn b_reads(b: &mut Bencher) {
         let path = "_rust_rocksdb_optimizetest";
-        let opts = RocksDBOptions::new();
-        let db = tuned_for_somebody_elses_disk(path, opts);
+        let mut opts = Options::new();
+        let mut blockopts = BlockBasedOptions::new();
+        let db = tuned_for_somebody_elses_disk(path, &mut opts, &mut blockopts);
         let mut i = 0 as u64;
         b.iter(|| {
             db.get(i.to_string().as_bytes()).on_error( |e| {
@@ -173,6 +176,6 @@ mod tests  {
             i += 1;
         });
         db.close();
-        RocksDB::destroy(opts, path).is_ok();
+        RocksDB::destroy(&opts, path).is_ok();
     }
 }

src/merge_operator.rs

@@ -20,7 +20,7 @@ use std::mem;
 use std::ptr;
 use std::slice;
 
-use rocksdb_options::{RocksDBOptions};
+use rocksdb_options::{Options};
 use rocksdb::{RocksDB, RocksDBResult, RocksDBVector, Writable};
 
 pub struct MergeOperatorCallback {
@@ -166,10 +166,10 @@ fn test_provided_merge(new_key: &[u8], existing_val: Option<&[u8]>,
 #[test]
 fn mergetest() {
     let path = "_rust_rocksdb_mergetest";
-    let opts = RocksDBOptions::new();
+    let mut opts = Options::new();
     opts.create_if_missing(true);
     opts.add_merge_operator("test operator", test_provided_merge);
-    let db = RocksDB::open(opts, path).unwrap();
+    let db = RocksDB::open(&opts, path).unwrap();
     let p = db.put(b"k1", b"a");
     assert!(p.is_ok());
     db.merge(b"k1", b"b");
@@ -189,10 +189,10 @@ fn mergetest() {
       .on_error( |e| { println!("error reading value")}); //: {", e) });
 
     assert!(m.is_ok());
-    let r: RocksDBResult<RocksDBVector, &str> = db.get(b"k1");
+    let r: RocksDBResult<RocksDBVector, String> = db.get(b"k1");
     assert!(r.unwrap().to_utf8().unwrap() == "abcdefgh");
     assert!(db.delete(b"k1").is_ok());
     assert!(db.get(b"k1").is_none());
     db.close();
-    assert!(RocksDB::destroy(opts, path).is_ok());
+    assert!(RocksDB::destroy(&opts, path).is_ok());
 }

src/rocksdb.rs

@@ -25,45 +25,50 @@ use std::slice;
 use std::str::from_utf8;
 
 use rocksdb_ffi;
-use rocksdb_ffi::RocksDBSnapshot;
-use rocksdb_options::RocksDBOptions;
+use rocksdb_options::Options;
 
 pub struct RocksDB {
     inner: rocksdb_ffi::RocksDBInstance,
 }
 
 pub struct WriteBatch {
-    inner: rocksdb_ffi::RocksDBWriteBatch
+    inner: rocksdb_ffi::RocksDBWriteBatch,
+}
+
+pub struct ReadOptions {
+    inner: rocksdb_ffi::RocksDBReadOptions,
 }
 
 // This is for the RocksDB and write batches to share the same API
 pub trait Writable {
-    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), &str>;
-    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), &str>;
-    fn delete(&self, key: &[u8]) -> Result<(),&str>;
+    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), String>;
+    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), String>;
+    fn delete(&self, key: &[u8]) -> Result<(), String>;
 }
 
-fn error_message<'a>(ptr: *const i8) -> &'a str {
-    unsafe {
-        return from_utf8(CStr::from_ptr(ptr).to_bytes()).unwrap();
-    }
+fn error_message(ptr: *const i8) -> String {
+    let c_str = unsafe { CStr::from_ptr(ptr) };
+    from_utf8(c_str.to_bytes()).unwrap().to_owned()
 }
 
 impl RocksDB {
-    pub fn open_default(path: &str) -> Result<RocksDB, &str> {
-        let opts = RocksDBOptions::new();
+    pub fn open_default(path: &str) -> Result<RocksDB, String> {
+        let mut opts = Options::new();
         opts.create_if_missing(true);
-        RocksDB::open(opts, path)
+        RocksDB::open(&opts, path)
     }
 
-    pub fn open(opts: RocksDBOptions, path: &str) -> Result<RocksDB, &str> {
-        let cpath = CString::new(path.as_bytes()).unwrap();
+    pub fn open(opts: &Options, path: &str) -> Result<RocksDB, String> {
+        let cpath = match CString::new(path.as_bytes()) {
+                        Ok(c) => c,
+                        Err(_) => return Err("Failed to convert path to CString when opening rocksdb".to_string()),
+        };
         let cpath_ptr = cpath.as_ptr();
 
         let ospath = Path::new(path);
         if !ospath.exists() {
             match fs::create_dir_all(&ospath) {
-                Err(e) => return Err("Failed to create rocksdb directory."),
+                Err(e) => return Err("Failed to create rocksdb directory.".to_string()),
                 Ok(_) => (),
             }
         }
@@ -78,19 +83,20 @@ impl RocksDB {
         if !err.is_null() {
             return Err(error_message(err));
         }
-        if db.0.is_null() {
-            return Err("Could not initialize database.");
+        let rocksdb_ffi::RocksDBInstance(db_ptr) = db;
+        if db_ptr.is_null() {
+            return Err("Could not initialize database.".to_string());
         }
         Ok(RocksDB{inner: db})
     }
 
-    pub fn destroy(opts: RocksDBOptions, path: &str) -> Result<(), &str> {
+    pub fn destroy(opts: &Options, path: &str) -> Result<(), String> {
         let cpath = CString::new(path.as_bytes()).unwrap();
         let cpath_ptr = cpath.as_ptr();
 
         let ospath = Path::new(path);
         if !ospath.exists() {
-            return Err("path does not exist");
+            return Err("path does not exist".to_string());
         }
 
         let err = 0 as *mut i8;
@@ -103,13 +109,13 @@ impl RocksDB {
         Ok(())
     }
 
-    pub fn repair(opts: RocksDBOptions, path: &str) -> Result<(), &str> {
+    pub fn repair(opts: Options, path: &str) -> Result<(), String> {
         let cpath = CString::new(path.as_bytes()).unwrap();
         let cpath_ptr = cpath.as_ptr();
 
         let ospath = Path::new(path);
         if !ospath.exists() {
-            return Err("path does not exist");
+            return Err("path does not exist".to_string());
         }
 
         let err = 0 as *mut i8;
@@ -122,33 +128,27 @@ impl RocksDB {
         Ok(())
     }
 
-    pub fn create_snapshot(self) -> RocksDBSnapshot {
-        unsafe {
-            rocksdb_ffi::rocksdb_create_snapshot(self.inner)
-        }
-    }
-
-    pub fn write(&self, batch: WriteBatch) -> Result<(), &str> {
+    pub fn write(&self, batch: WriteBatch) -> Result<(), String> {
+        let writeopts = unsafe { rocksdb_ffi::rocksdb_writeoptions_create() };
+        let err = 0 as *mut i8;
         unsafe {
-            let writeopts = rocksdb_ffi::rocksdb_writeoptions_create();
-            let err = 0 as *mut i8;
             rocksdb_ffi::rocksdb_write(self.inner, writeopts.clone(), batch.inner, err);
             rocksdb_ffi::rocksdb_writeoptions_destroy(writeopts);
-            if !err.is_null() {
-                return Err(error_message(err));
-            }
-            return Ok(())
         }
+        if !err.is_null() {
+            return Err(error_message(err));
+        }
+        return Ok(())
     }
 
-    pub fn get(&self, key: &[u8]) -> RocksDBResult<RocksDBVector, &str> {
+    pub fn get(&self, key: &[u8]) -> RocksDBResult<RocksDBVector, String> {
         unsafe {
             let readopts = rocksdb_ffi::rocksdb_readoptions_create();
             if readopts.0.is_null() {
                 return RocksDBResult::Error("Unable to create rocksdb read \
                     options.  This is a fairly trivial call, and its failure \
                     may be indicative of a mis-compiled or mis-loaded rocksdb \
-                    library.");
+                    library.".to_string());
             }
 
             let val_len: size_t = 0;
@@ -175,7 +175,7 @@ impl RocksDB {
 }
 
 impl Writable for RocksDB {
-    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), &str> {
+    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), String> {
         unsafe {
             let writeopts = rocksdb_ffi::rocksdb_writeoptions_create();
             let err = 0 as *mut i8;
@@ -190,7 +190,7 @@ impl Writable for RocksDB {
         }
     }
 
-    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), &str> {
+    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), String> {
         unsafe {
             let writeopts = rocksdb_ffi::rocksdb_writeoptions_create();
             let err = 0 as *mut i8;
@@ -205,7 +205,7 @@ impl Writable for RocksDB {
         }
     }
 
-    fn delete(&self, key: &[u8]) -> Result<(),&str> {
+    fn delete(&self, key: &[u8]) -> Result<(), String> {
         unsafe {
             let writeopts = rocksdb_ffi::rocksdb_writeoptions_create();
             let err = 0 as *mut i8;
@@ -239,7 +239,7 @@ impl Drop for WriteBatch {
 }
 
 impl Writable for WriteBatch {
-    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), &str> {
+    fn put(&self, key: &[u8], value: &[u8]) -> Result<(), String> {
         unsafe {
             rocksdb_ffi::rocksdb_writebatch_put(self.inner, key.as_ptr(),
                         key.len() as size_t, value.as_ptr(),
@@ -248,7 +248,7 @@ impl Writable for WriteBatch {
         }
     }
 
-    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), &str> {
+    fn merge(&self, key: &[u8], value: &[u8]) -> Result<(), String> {
         unsafe {
             rocksdb_ffi::rocksdb_writebatch_merge(self.inner, key.as_ptr(),
                         key.len() as size_t, value.as_ptr(),
@@ -257,7 +257,7 @@ impl Writable for WriteBatch {
         }
     }
 
-    fn delete(&self, key: &[u8]) -> Result<(),&str> {
+    fn delete(&self, key: &[u8]) -> Result<(), String> {
         unsafe {
             rocksdb_ffi::rocksdb_writebatch_delete(self.inner, key.as_ptr(),
                         key.len() as size_t);
@@ -266,6 +266,23 @@ impl Writable for WriteBatch {
     }
 }
 
+impl Drop for ReadOptions {
+    fn drop(&mut self) {
+        unsafe {
+            rocksdb_ffi::rocksdb_readoptions_destroy(self.inner)
+        }
+    }
+}
+
+impl ReadOptions {
+    fn fill_cache(&mut self, v: bool) {
+        unsafe {
+            rocksdb_ffi::rocksdb_readoptions_set_fill_cache(self.inner, v);
+        }
+    }
+
+}
+
 pub struct RocksDBVector {
     base: Unique<u8>,
     len: usize,
@@ -378,13 +395,13 @@ fn external() {
     let db = RocksDB::open_default(path).unwrap();
     let p = db.put(b"k1", b"v1111");
     assert!(p.is_ok());
-    let r: RocksDBResult<RocksDBVector, &str> = db.get(b"k1");
+    let r: RocksDBResult<RocksDBVector, String> = db.get(b"k1");
     assert!(r.unwrap().to_utf8().unwrap() == "v1111");
     assert!(db.delete(b"k1").is_ok());
     assert!(db.get(b"k1").is_none());
     db.close();
-    let opts = RocksDBOptions::new();
-    assert!(RocksDB::destroy(opts, path).is_ok());
+    let opts = Options::new();
+    assert!(RocksDB::destroy(&opts, path).is_ok());
 }
 
 #[test]
@@ -398,7 +415,7 @@ fn writebatch_works() {
         assert!(db.get(b"k1").is_none());
         let p = db.write(batch);
         assert!(p.is_ok());
-        let r: RocksDBResult<RocksDBVector, &str> = db.get(b"k1");
+        let r: RocksDBResult<RocksDBVector, String> = db.get(b"k1");
         assert!(r.unwrap().to_utf8().unwrap() == "v1111");
     }
     { // test delete
@@ -409,6 +426,6 @@ fn writebatch_works() {
         assert!(db.get(b"k1").is_none());
     }
     db.close();
-    let opts = RocksDBOptions::new();
-    assert!(RocksDB::destroy(opts, path).is_ok());
+    let opts = Options::new();
+    assert!(RocksDB::destroy(&opts, path).is_ok());
 }