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    use std::{io, fs, path};
    use std::collections::BTreeSet;
    use ser::{ReadIterator, deserialize_iterator, Error as ReaderError};
    use block::Block;
    use fs::read_blk_dir;

    pub fn open_blk_file<P>(path: P) -> Result<BlkFile, io::Error> where P: AsRef<path::Path> {
    	trace!("Opening blk file: {:?}", path.as_ref());
    	let file = try!(fs::File::open(path));
    	let blk_file = BlkFile {
    		reader: deserialize_iterator(file),
    	};
    	Ok(blk_file)
    }

    pub struct BlkFile {
    	reader: ReadIterator<fs::File, Block>,
    }

    impl Iterator for BlkFile {
    	type Item = Result<Block, ReaderError>;

    	fn next(&mut self) -> Option<Self::Item> {
    		self.reader.next()
    	}
    }

    /// Creates iterator over bitcoind database blocks
    pub fn open_blk_dir<P>(path: P) -> Result<BlkDir, io::Error> where P: AsRef<path::Path> {
    	let files = read_blk_dir(path)?.collect::<Result<BTreeSet<_>, _>>()?;

    	let iter = files.into_iter()
    		// flatten results...
    		.flat_map(|file| open_blk_file(file.path))
    		// flat iterators over each block in each file
    		.flat_map(|file| file);

    	let blk_dir = BlkDir {
    		iter: Box::new(iter),
    	};

    	Ok(blk_dir)
    }

    /// Bitcoind database blocks iterator
    pub struct BlkDir {
    	iter: Box<Iterator<Item = Result<Block, ReaderError>>>,
    }

    impl Iterator for BlkDir {
    	type Item = Result<Block, ReaderError>;

    	fn next(&mut self) -> Option<Self::Item> {
    		self.iter.next()
    	}
    }

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