Shadow

The shadow service for relayers and verify workers to retrieve header data and generate proof. Shadow will index the data it needs from blockchain nodes, such as Ethereum and Darwinia.

Build

cargo build --release

Note: This will automatically build a libdarwinia_shadow dynamic lib in /usr/local/lib/. For static lib link, use

LIBRARY_TYPE=static cargo build --release

Usage

darwinia-shadow 0.7.0

USAGE:
    shadow <SUBCOMMAND>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

SUBCOMMANDS:
    epoch    Generate epoch data for ethash
    help     Prints this message or the help of the given subcommand(s)
    run      Start shadow service

Download

$ cargo install darwinia-shadow

Note

• Please make sure you have golang installed in your machine

Environment Variables

• ETHEREUM_RPC

  Optional. The RPC endpoint of an Etherum node, only http:// and https://are supported. Default is http://localhost:8545 .

  Example: http://localhost:8545/

Trouble Shooting

Everytime you run proof in error, please delete ~/.ethashproof and ~/.ethash and retry.

Apis

Get proofs

1. get the mmr proof of member under the root of last_leaf's mountain
2. get the ethash of target block

REQUEST

POST /ethereum/ethash_proof

REQUEST PARAMS

{
  "target": 10
  // ethash of target, last_leaf == target - 1
}

RESPONSE

{
  "ethash_proof": [
    {
      "dag_nodes": [
        "0x5f5a713f8189...",
        "0x0011509c9e55..."
      ],
      "proof": [
        "0x4d1fe9b0c4bd1e33ca4887ed3e49f244",
        ...
      ]
    },
    ...
  ]
}

{
  "error": "STRING, error message"
}

EXAMPLE

> curl https://shadow.darwinia.network/ethereum/proof \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"target": 10}'
{"ethash_proof":[...]}

Get ethereum tx receipt by tx hash

REQUEST

GET /ethereum/receipt/{tx_hash}

REQUEST PARAMS

tx_hash: ethereum tx hash

RESPONSE

{
  "header": {
    "parent_hash": "hash of the parent block",
    "timestamp": INTEGER,
    //the unix timestamp for when the block was collated
    "number": INTEGER,
    // the block number
    "author": "the address of the beneficiary to whom the mining rewards were given",
    "transactions_root": "the root of the transaction trie of the block",
    "uncles_hash": "SHA3 of the uncles data in the block",
    "extra_data": "the extra data field of this block",
    "state_root": "the root of the final state trie of the block",
    "receipts_root": "the root of the receipts trie of the block",
    "log_bloom": "the bloom filter for the logs of the block",
    "gas_used": INTEGER,
    // the total used gas by all transactions in this block
    "gas_limit": INTEGER,
    // the maximum gas allowed in this block
    "difficulty": INTEGER,
    // the difficulty for this block
    "seal": STRING
    ARRAY,
    //
    "hash": "hash of the block"
  },
  "receipt_proof": {
    "index": "0x4b",
    "proof": "",
    "header_hash": ""
  }
}

{
  "error": "STRING, error message"
}

EXAMPLE

> curl https://shadow.darwinia.network/ethereum/receipt/0x9b8f30bc20809571dd2382433b28d259456cb7f03aec935f6592e1ba1f1173e1
{"header":{...},"receipt_proof":{...}}

LICENSE

GPL-3.0