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    //! Bridge between Tracedb and Blockchain.

    use util::{H256};
    use header::BlockNumber;
    use trace::DatabaseExtras as TraceDatabaseExtras;
    use blockchain::{BlockChain, BlockProvider};
    use blockchain::extras::TransactionAddress;
    pub use types::trace_filter::Filter;

    impl TraceDatabaseExtras for BlockChain {
    	fn block_hash(&self, block_number: BlockNumber) -> Option<H256> {
    		(self as &BlockProvider).block_hash(block_number)
    	}

    	fn transaction_hash(&self, block_number: BlockNumber, tx_position: usize) -> Option<H256> {
    		(self as &BlockProvider).block_hash(block_number)
    			.and_then(|block_hash| {
    				let tx_address = TransactionAddress {
    					block_hash: block_hash,
    					index: tx_position
    				};
    				self.transaction(&tx_address)
    			})
    			.map(|tx| tx.hash())
    	}
    }

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