compilation fixes, some cleanup, although much is still needed

Cargo.toml

@@ -2,6 +2,6 @@
 
 name = "rocksdb"
 description = "A rust wrapper for Facebook's RocksDB embeddable database."
-version = "0.0.2"
+version = "0.0.3"
 authors = ["Tyler Neely <t@jujit.su>"]
 license = "Apache-2.0"

src/ffi.rs

@@ -15,6 +15,7 @@
 */
 extern crate libc;
 use self::libc::{c_char, c_int, c_void, size_t};
+use std::ffi::CString;
 
 #[repr(C)]
 pub struct RocksDBOptions(pub *const c_void);
@@ -41,6 +42,9 @@ impl Copy for RocksDBMergeOperator {}
 impl Copy for RocksDBBlockBasedTableOptions {}
 impl Copy for RocksDBCache {}
 impl Copy for RocksDBFilterPolicy {}
+impl Copy for RocksDBCompactionStyle {}
+impl Copy for RocksDBCompressionType {}
+impl Copy for RocksDBUniversalCompactionStyle {}
 
 pub fn new_bloom_filter(bits: c_int) -> RocksDBFilterPolicy {
     unsafe {
@@ -216,14 +220,14 @@ fn internal() {
     unsafe {
         let opts = rocksdb_options_create();
         let RocksDBOptions(opt_ptr) = opts;
-        assert!(opt_ptr.is_not_null());
+        assert!(!opt_ptr.is_null());
 
         rocksdb_options_increase_parallelism(opts, 0);
         rocksdb_options_optimize_level_style_compaction(opts, 0);
         rocksdb_options_set_create_if_missing(opts, true);
 
         let rustpath = "_rust_rocksdb_internaltest";
-        let cpath = rustpath.to_c_str();
+        let cpath = CString::from_slice(rustpath.as_bytes());
         let cpath_ptr = cpath.as_ptr();
 
         let err = 0 as *mut i8;
@@ -232,7 +236,7 @@ fn internal() {
 
         let writeopts = rocksdb_writeoptions_create();
         let RocksDBWriteOptions(write_opt_ptr) = writeopts;
-        assert!(write_opt_ptr.is_not_null());
+        assert!(!write_opt_ptr.is_null());
 
         let key = b"name\x00";
         let val = b"spacejam\x00";
@@ -242,7 +246,7 @@ fn internal() {
 
         let readopts = rocksdb_readoptions_create();
         let RocksDBReadOptions(read_opts_ptr) = readopts;
-        assert!(read_opts_ptr.is_not_null());
+        assert!(!read_opts_ptr.is_null());
 
         let val_len: size_t = 0;
         let val_len_ptr = &val_len as *const size_t;

src/main.rs

@@ -13,6 +13,8 @@
    See the License for the specific language governing permissions and
    limitations under the License.
 */
+#![allow(unstable)]
+
 extern crate rocksdb;
 extern crate test;
 use rocksdb::{RocksDBOptions, RocksDB, MergeOperands, new_bloom_filter};
@@ -44,7 +46,7 @@ fn main() {
 #[allow(dead_code)]
 fn concat_merge(new_key: &[u8], existing_val: Option<&[u8]>,
     mut operands: &mut MergeOperands) -> Vec<u8> {
-    let mut result: Vec<u8> = Vec::with_capacity(operands.size_hint().val0());
+    let mut result: Vec<u8> = Vec::with_capacity(operands.size_hint().0);
     match existing_val {
         Some(v) => result.push_all(v),
         None => (),

src/rocksdb.rs

@@ -13,6 +13,8 @@
    See the License for the specific language governing permissions and
    limitations under the License.
 */
+#![allow(unstable)]
+
 extern crate libc;
 use self::libc::{c_char, c_int, c_void, size_t};
 use std::io::{IoError};
@@ -297,7 +299,7 @@ impl RocksDB {
             let err = 0 as *mut i8;
             let db = rocksdb_ffi::rocksdb_open(opts.inner, cpath_ptr, err);
             let rocksdb_ffi::RocksDBInstance(db_ptr) = db;
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return Err(cs);
             }
@@ -319,7 +321,7 @@ impl RocksDB {
             let err = 0 as *mut i8;
             let result = rocksdb_ffi::rocksdb_destroy_db(
                 opts.inner, cpath_ptr, err);
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return Err(cs);
             }
@@ -334,7 +336,7 @@ impl RocksDB {
             rocksdb_ffi::rocksdb_put(self.inner, writeopts, key.as_ptr(),
                         key.len() as size_t, value.as_ptr(),
                         value.len() as size_t, err);
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return Err(cs);
             }
@@ -349,7 +351,7 @@ impl RocksDB {
             rocksdb_ffi::rocksdb_merge(self.inner, writeopts, key.as_ptr(),
                         key.len() as size_t, value.as_ptr(),
                         value.len() as size_t, err);
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return Err(cs);
             }
@@ -375,7 +377,7 @@ impl RocksDB {
             let err = 0 as *mut i8;
             let val = rocksdb_ffi::rocksdb_get(self.inner, readopts,
                 key.as_ptr(), key.len() as size_t, val_len_ptr, err) as *mut u8;
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return RocksDBResult::Error(cs);
             }
@@ -394,7 +396,7 @@ impl RocksDB {
             let err = 0 as *mut i8;
             rocksdb_ffi::rocksdb_delete(self.inner, writeopts, key.as_ptr(),
                         key.len() as size_t, err);
-            if err != 0 as *mut i8 {
+            if !err.is_null() {
                 let cs = from_c_str(err as *const i8);
                 return Err(cs);
             }
@@ -412,6 +414,13 @@ pub struct RocksDBVector {
     len: usize,
 }
 
+impl Deref for RocksDBVector {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe { slice::from_raw_mut_buf(&self.base.0, self.len) }
+    }
+}
+
 impl Drop for RocksDBVector {
     fn drop(&mut self) {
         unsafe {
@@ -431,14 +440,8 @@ impl RocksDBVector {
         }
     }
 
-    pub fn as_slice<'a>(&'a self) -> &'a [u8] {
-        unsafe {
-             slice::from_raw_buf(self.base.0 as *const u8, self.len)
-        }
-    }
-
-    pub fn to_utf8(&self) -> Option<&str> {
-        from_utf8(self.as_slice()).ok()
+    pub fn to_utf8<'a>(&'a self) -> Option<&'a str> {
+        from_utf8(self.deref()).ok()
     }
 }
 
@@ -452,7 +455,7 @@ pub enum RocksDBResult<'a,T,E> {
 }
 
 impl <'a,T,E> RocksDBResult<'a,T,E> {
-    pub fn map<U>(self, f: &mut FnOnce(T) -> U) -> RocksDBResult<'a,U,E> {
+    pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> RocksDBResult<'a,U,E> {
         match self {
             RocksDBResult::Some(x) => RocksDBResult::Some(f(x)),
             RocksDBResult::None => RocksDBResult::None,
@@ -470,7 +473,7 @@ impl <'a,T,E> RocksDBResult<'a,T,E> {
         }
     }
 
-    pub fn on_error<U>(self, f: FnOnce(E) -> U) -> RocksDBResult<'a,T,U> {
+    pub fn on_error<U, F: FnOnce(E) -> U>(self, f: F) -> RocksDBResult<'a,T,U> {
         match self {
             RocksDBResult::Some(x) => RocksDBResult::Some(x),
             RocksDBResult::None => RocksDBResult::None,
@@ -478,7 +481,7 @@ impl <'a,T,E> RocksDBResult<'a,T,E> {
         }
     }
 
-    pub fn on_absent(self, f: FnOnce() -> ()) -> RocksDBResult<'a,T,E> {
+    pub fn on_absent<F: FnOnce()->()>(self, f: F) -> RocksDBResult<'a,T,E> {
         match self {
             RocksDBResult::Some(x) => RocksDBResult::Some(x),
             RocksDBResult::None => {
@@ -519,7 +522,7 @@ 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, String> = db.get(b"k1");
+    let r: RocksDBResult<RocksDBVector, &str> = 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());
@@ -565,8 +568,6 @@ impl<'a> Iterator for &'a mut MergeOperands<'a> {
                         as *const size_t;
                     let len = *len_ptr as usize;
                     let ptr = base + (spacing * self.cursor);
-                    let op = String::from_utf8(slice::from_raw_buf(*(ptr as *const *const u8), len));
-                    let des: Option<usize> = op.to_utf8();
                     self.cursor += 1;
                     Some(mem::transmute(Slice{data:*(ptr as *const *const u8)
                         as *const u8, len: len}))
@@ -602,7 +603,7 @@ extern "C" fn name_callback(raw_cb: *mut c_void) -> *const c_char {
 }
 
 extern "C" fn full_merge_callback(
-    raw_cb: *mut c_void, key: *const c_char, key_len: size_t,
+    raw_cb: *mut c_void, raw_key: *const c_char, key_len: size_t,
     existing_value: *const c_char, existing_value_len: size_t,
     operands_list: *const *const c_char, operands_list_len: *const size_t,
     num_operands: c_int,
@@ -614,20 +615,15 @@ extern "C" fn full_merge_callback(
             &mut MergeOperands::new(operands_list,
                                     operands_list_len,
                                     num_operands);
-        let key = String::from_utf8(slice::from_raw_buf(key as *const u8, key_len as usize));
-        let oldval = String::from_utf8(slice::from_raw_buf(existing_value as *const u8,
+        let key: &[u8] = mem::transmute(slice::from_raw_buf(&raw_key, key_len as usize));
+        let oldval: &[u8] = mem::transmute(slice::from_raw_buf(&existing_value,
                                   existing_value_len as usize));
         let mut result =
-            (cb.merge_fn)(key.as_bytes(), Some(oldval.as_bytes()), operands);
+            (cb.merge_fn)(key, Some(oldval), operands);
         result.shrink_to_fit();
-        /*
-        let ptr = result.as_ptr();
-        mem::forget(result);
-        ptr as *const c_char
-        */
         //TODO(tan) investigate zero-copy techniques to improve performance
         let buf = libc::malloc(result.len() as size_t);
-        assert!(buf.is_not_null());
+        assert!(!buf.is_null());
         *new_value_length = result.len() as size_t;
         *success = 1 as u8;
         ptr::copy_memory(&mut *buf, result.as_ptr()
@@ -637,7 +633,7 @@ extern "C" fn full_merge_callback(
 }
 
 extern "C" fn partial_merge_callback(
-    raw_cb: *mut c_void, key: *const c_char, key_len: size_t,
+    raw_cb: *mut c_void, raw_key: *const c_char, key_len: size_t,
     operands_list: *const *const c_char, operands_list_len: *const size_t,
     num_operands: c_int,
     success: *mut u8, new_value_length: *mut size_t) -> *const c_char {
@@ -647,12 +643,12 @@ extern "C" fn partial_merge_callback(
         let operands = &mut MergeOperands::new(operands_list,
                                                operands_list_len,
                                                num_operands);
-        let key = String::from_utf8(slice::from_raw_buf(key as *const u8, key_len as usize));
-        let mut result = (cb.merge_fn)(key.as_bytes(), None, operands);
+        let key: &[u8] = mem::transmute(slice::from_raw_buf(&raw_key, key_len as usize));
+        let mut result = (cb.merge_fn)(key, None, operands);
         result.shrink_to_fit();
         //TODO(tan) investigate zero-copy techniques to improve performance
         let buf = libc::malloc(result.len() as size_t);
-        assert!(buf.is_not_null());
+        assert!(!buf.is_null());
         *new_value_length = 1 as size_t;
         *success = 1 as u8;
         ptr::copy_memory(&mut *buf, result.as_ptr()
@@ -663,7 +659,7 @@ extern "C" fn partial_merge_callback(
 
 fn test_provided_merge(new_key: &[u8], existing_val: Option<&[u8]>,
     mut operands: &mut MergeOperands) -> Vec<u8> {
-    let nops = operands.size_hint().0();
+    let nops = operands.size_hint().0;
     let mut result: Vec<u8> = Vec::with_capacity(nops);
     match existing_val {
         Some(v) => result.push_all(v),
@@ -679,7 +675,6 @@ fn test_provided_merge(new_key: &[u8], existing_val: Option<&[u8]>,
 #[test]
 fn mergetest() {
     let path = "_rust_rocksdb_mergetest";
-    unsafe {
     let opts = RocksDBOptions::new();
     opts.create_if_missing(true);
     opts.add_merge_operator("test operator", test_provided_merge);
@@ -703,11 +698,10 @@ fn mergetest() {
       .on_error( |e| { println!("error reading value")}); //: {", e) });
 
     assert!(m.is_ok());
-        let r: RocksDBResult<RocksDBVector, String> = db.get(b"k1");
+    let r: RocksDBResult<RocksDBVector, &str> = 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());
-    }
 }