Block chain reading code in go-ethereum

I have downloaded the go-ethereum code and analyzing it. It is working properly but I am not able to locate the local database (ldb) read and write for the block.

I have seen the eth.getBalance() function code but I could not find the read option anywhere. It is going through the trie and get the data.

How the blocks are taken by the programs are not identifiable in the code?
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