Where can i get local merkle-patricia-tree root of my chain for look it in Nodejs?

Question

In addition to my prev question...

So i want to get data from my local chain. For that i use example form wanderer.github.io. I open my chain and get raw data, so this data, according to example - just raw node from chain. Next i need to see value of keys in that node. To do that i understood: all keys hidden in the bottom of a merkle-patricia-tree.

Let's speak about my problem. I want to do like in github: open my local wallet and look info about it, for that i looked at example:

//the genesis state root
var root = '12582945fc5ad12c3e7b67c4fc37a68fc0d52d995bb7f7291ff41a2739a7ca16';
var trie = new Trie(db, root);

//gav's address
var gav = new Buffer('8a40bfaa73256b60764c1bf40675a99083efb075', 'hex');

trie.get(gav, function (err, val) {
  var decoded = rlp.decode(val);
  console.log(decoded);
});

and wrote my own code with the fixes problem Invalid root length. Roots are 32 bytes:

var root = new Buffer('e5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc', 'hex'), 
    wallet = new Buffer('234132b22de7037e50b9fc4ebd7476315647869e', 'hex');

// work normally and get tree
var trie = new Trie(db, root);

trie.get(

    // what need to view
    wallet,

    // function which work with wallet info
    function (err, value)
    {
        console.log(err);
        console.log(value);

        var decoded = rlp.decode(value);
        console.log(decoded);
    }
);

It's work, but not get info. I didn't find root in my local chain like in example:

//the genesis state root
var root = '12582945fc5ad12c3e7b67c4fc37a68fc0d52d995bb7f7291ff41a2739a7ca16';
var trie = new Trie(db, root);

Anybody, let's help Dora to find the right root of local chain which be correct. Here my 0, 1 and last blocks from chain - maybe it will help you:

debug.printBlock(0)

"Block(#0): Size: 507.00 B { MinerHash: e521eab0c63dfd8bc7c6007e8b2ce954a66f9df3ab72ccf059e5aa49aeb149d8 Header(e5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc):[ParentHash: 0000000000000000000000000000000000000000000000000000000000000000 UncleHash: 1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347 Coinbase:0000000000000000000000000000000000000000 Root: 9178d0f23c965d81f0834a4c72c6253ce6830f4022b1359aaebfc1ecba442d4e TxSha 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 ReceiptSha: 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 Bloom: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Difficulty:131072 Number:0 GasLimit:4712388 GasUsed:0 Time:0 Extra: MixDigest: 0000000000000000000000000000000000000000000000000000000000000000 Nonce:000000000000002a] Transactions:[] Uncles:[] }"

debug.printBlock(1)

"Block(#1): Size: 536.00 B {MinerHash: d8cebba1edfdd6f0364183ace1c5bdd8b5efb2999068aa8084c84043c4a5eb5e Header(3ab5cb6c29e583c50b90e413dca4a6df802d87dd0eb9569dff926f856d011375):[ParentHash: e5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc UncleHash: 1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347 Coinbase: 234132b22de7037e50b9fc4ebd7476315647869e Root: 9c12c460f11fcf78d993119e08727e3e45266b3287e68fd42ef90bc730d275f6 TxSha 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 ReceiptSha: 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 Bloom: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Difficulty: 131072 Number: 1 GasLimit: 4712388 GasUsed: 0 Time: 1511614605 Extra: \u0603\x01\a\x02�geth�go1.9.2�darwin MixDigest: 1d51851bf1fca11a0e670fb359b7420f1393074c8c2f1760edfa3a638652a7f7 Nonce: 33c0052eafe0f837] Transactions:[] Uncles:[]}"

> debug.printBlock(81)

"Block(#81): Size: 536.00 B { MinerHash: 5fc817cc85c1ca755186f81e7a96699b68e43e53dc834a529de53bb8adcccaad Header(0dc9b40ee5b8039f2caad3542289000b22319aba762ae854208e3c73c7a31954): [ ParentHash: d9e010a5154b44cd18706decb2d47b739c71d83e4b9b53d2d14d19b6aa423001 UncleHash: 1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347 Coinbase: 234132b22de7037e50b9fc4ebd7476315647869e Root: 2aeb24f3daa4f2ed2accc00ca9af287784cc9f7292bb1bc42641490f56e235e2 TxSha 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 ReceiptSha: 56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 Bloom: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Difficulty: 132928 Number: 81 GasLimit: 4712388 GasUsed: 0 Time: 1511643645 Extra: \u0603\x01\a\x02�geth�go1.9.2�darwin MixDigest: 486a097820216125cfe87aa9e8f67b7f64b51591026db5e205aec9e8bf4f1d5e Nonce: 21ac7e333ca8a7c4 ] Transactions: [] Uncles: [] } "

I tried to use genesis as root, but that not work:

"0xe5be92145a301820111f91866566e3e99ee344d155569e4556a39bc71238f3bc"

Answer 1

You can use Geth's dump command to grab block 0, and then grab the top part of the output:

$ geth  dump  0  | head
INFO [11-26|19:58:18] Allocated cache and file handles         database=/home/richard/.ethereum/geth/chaindata cache=128 handles=1024
INFO [11-26|19:58:18] Disk storage enabled for ethash caches   dir=/home/richard/.ethereum/geth/ethash count=3
INFO [11-26|19:58:18] Disk storage enabled for ethash DAGs     dir=/home/richard/.ethash               count=2
INFO [11-26|19:58:18] Loaded most recent local header          number=18048 hash=a57baa…6c2b4d td=8705769076450279
INFO [11-26|19:58:18] Loaded most recent local full block      number=0     hash=d4e567…cb8fa3 td=17179869184
INFO [11-26|19:58:18] Loaded most recent local fast block      number=18048 hash=a57baa…6c2b4d td=8705769076450279
{
    "root": "d7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544",
    "accounts": {
        "000d836201318ec6899a67540690382780743280": {
            "balance": "200000000000000000000",
            "nonce": 0,
            "root": "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
            "codeHash": "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
            "code": "",
            "storage": {}

The first root should be the hash of the state root.

(If your chaindata is in a non-standard place you'll need to use the --datadir flag as well.)