Merge pull request #75 from kaedroho/db-path

Port path() method from ngauts fork and implement Debug for DB

src/rocksdb.rs

@@ -32,6 +32,7 @@ use rocksdb_options::{Options, WriteOptions};
 pub struct DB {
     inner: rocksdb_ffi::DBInstance,
     cfs: BTreeMap<String, DBCFHandle>,
+    path: String,
 }
 
 unsafe impl Send for DB {}
@@ -405,6 +406,7 @@ impl DB {
         Ok(DB {
             inner: db,
             cfs: cf_map,
+            path: path.to_owned(),
         })
     }
 
@@ -442,6 +444,10 @@ impl DB {
         Ok(())
     }
 
+    pub fn path(&self) -> &str {
+        &self.path
+    }
+
     pub fn write_opt(&self,
                      batch: WriteBatch,
                      writeopts: &WriteOptions)
@@ -814,6 +820,12 @@ impl Drop for DB {
     }
 }
 
+impl fmt::Debug for DB {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "RocksDB {{ path: {:?} }}", self.path())
+    }
+}
+
 impl Writable for WriteBatch {
     /// Insert a value into the database under the given key
     fn put(&self, key: &[u8], value: &[u8]) -> Result<(), Error> {