Python API

Question

我希望对以太坊区块链进行一些分析，特别是在可用散列功率和交易确认时间之间寻找数据的相关性。但是，我无法理解如何下载其中一个区块链或从中提取交易和工人信息。

理想情况下，我会下载区块链，然后使用python脚本将区块链中的相关信息提取到CSV文件或类似内容中？

有关如何实现这一目标的任何指示？

Answer 1

标准接口

标准以太坊节点可以公开json-rpc interface。它通常可以通过本地套接字（也称为IPC）或HTTP访问，具体取决于您拥有的节点以及启动方式。

从命令行，从geth获取块5,000,000的统计信息：

$ curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x4c4b40", false],"id":1}' -H "Content-Type: application/json" http://localhost:8545/
{'id': 1,
 'jsonrpc': '2.0',
 'result': {'difficulty': '0x90c21c56929b2',
  'extraData': '0x743132',
  'gasLimit': '0x7a121d',
  'gasUsed': '0x79fac5',
  'hash': '0x7d5a4369273c723454ac137f48a4f142b097aa2779464e6505f1b1c5e37b5382',
  'logsBloom': '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',
  'miner': '0xb2930b35844a230f00e51431acae96fe543a0347',
  'mixHash': '0x94cd4e844619ee20989578276a0a9046877d569d37ba076bf2e8e34f76189dea',
  'nonce': '0x4617a20003ba3f25',
  'number': '0x4c4b40',
  'parentHash': '0xcae4df80f5862e4321690857eded0d8a40136dafb8155453920bade5bd0c46c0',
  'receiptsRoot': '0x6db67db55d5d972c59646a3bda26a39422e71fe400e4cdf9eb7f5c09b0efa7d0',
  'sha3Uncles': '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
  'size': '0x5dd1',
  'stateRoot': '0x6092dfd6bcdd375764d8718c365ce0e8323034da3d3b0c6d72cf7304996b86ad',
  'timestamp': '0x5a70760d',
  'totalDifficulty': '0x7be181d83d2d77d052',
  'transactions': ['0x569c5b35f203ca6db6e2cec44bceba756fad513384e2bd79c06a8c0181273379',
   ...
   '0xaa2703c3ae5d0024b2c3ab77e5200bb2a8eb39a140fad01e89a495d73760297c'],
  'transactionsRoot': '0x91dfce7cc2174482b5ebcf6f4beedce854641982eadb1a8cf538e3206abf7836',
  'uncles': []}}

Python API

有几个“web3”库可用于不同语言，每个库都提供了json-rpc上的抽象层。例如，Web3.py是由以太坊基金会资助的python接口。

使用Web3.py v4-beta（随pip install --pre web3安装），您可以通过这种方式获得相同的信息：

>>> from web3.auto import w3
>>> w3.eth.getBlock('latest')
AttributeDict({'difficulty': 2760989505172940,
 'extraData': HexBytes('0x65746865726d696e652d6177732d7573312d32'),
 'gasLimit': 8000029,
 'gasUsed': 1729027,
 'hash': HexBytes('0xff07c9bba34bf864d144c39b4f99d3fc981afcaab02c3da6456c096aab51eb89'),
 'logsBloom': HexBytes('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'),
 'miner': '0xEA674fdDe714fd979de3EdF0F56AA9716B898ec8',
 'mixHash': HexBytes('0xe3aeeafccb31673b210c17610d9706a51ad8f9f8bf35a8b71ea8fba5bb260f09'),
 'nonce': HexBytes('0x79d592e01fafd7e9'),
 'number': 5020225,
 'parentHash': HexBytes('0x41e96f6e823dd46f25bb0219c6ff9bccf418879d50f9f426cc40028d115ca785'),
 'receiptsRoot': HexBytes('0xdd7abf25ebb95c9629453b2d287d929b343ea86f52deed83c4a06d64a10137ad'),
 'sha3Uncles': HexBytes('0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347'),
 'size': 6699,
 'stateRoot': HexBytes('0x410941207de8fe6a4ea7841a2f8eb67a101c58d35691bd998ecec9a7e2350813'),
 'timestamp': 1517618294,
 'totalDifficulty': 2338872012321049424432,
 'transactions': [HexBytes('0x5ef662053e3acb450aefdbed9115c81c2562de71cc4907dc3a1647d0810d83ea'),
    ...
    HexBytes('0x23d0cbc238d12c11a5df5cb8f6cf04e89a8d270baf4b5de94c7285750774784e')],
 'transactionsRoot': HexBytes('0xdcaa0c4c4af12e9397e1d93312672e1aeb947262c25111a7ced7a31104135f26'),
 'uncles': []})

注意：我是Web3.py

的维护者

Answer 2

启动进程时提供RPC（--rpc）选项。确保您拥有整个区块链。 rpc在localhost：8545上启动服务器进程。您可以通过--rpcport选项根据您的意愿更改端口。

只需将HTTP Get请求（通过CURL或某些http模块）发送到localhost：8545，然后以JSON格式获取必要的信息。您还可以使用与区块链接口的web3.js或web3.py API，基本上在进程打开的控制台上执行。

https://github.com/ethereum/wiki/wiki/JSON-RPC

Answer 3

此处是有关如何将以太坊数据导出到csv https://medium.com/@medvedev1088/exporting-and-analyzing-ethereum-blockchain-f5353414a94e

的指南

它使用https://github.com/medvedev1088/ethereum-etl将数据输出到blocks.csv，transactions.csv，erc20_transfers.csv。

blocks.csv

Column                  | Type               |
------------------------|---------------------
block_number            | bigint             |
block_hash              | hex_string         |
block_parent_hash       | hex_string         |
block_nonce             | hex_string         |
block_sha3_uncles       | hex_string         |
block_logs_bloom        | hex_string         |
block_transactions_root | hex_string         |
block_state_root        | hex_string         |
block_miner             | hex_string         |
block_difficulty        | bigint             |
block_total_difficulty  | bigint             |
block_size              | bigint             |
block_extra_data        | hex_string         |
block_gas_limit         | bigint             |
block_gas_used          | bigint             |
block_timestamp         | bigint             |
block_transaction_count | bigint             |

transactions.csv

Column              |    Type     |
--------------------|--------------
tx_hash             | hex_string  |
tx_nonce            | bigint      |
tx_block_hash       | hex_string  |
tx_block_number     | bigint      |
tx_index            | bigint      |
tx_from             | hex_string  |
tx_to               | hex_string  |
tx_value            | bigint      |
tx_gas              | bigint      |
tx_gas_price        | bigint      |
tx_input            | hex_string  |

erc20_transfers.csv

Column              |    Type     |
--------------------|--------------
erc20_token         | hex_string  |
erc20_from          | hex_string  |
erc20_to            | hex_string  |
erc20_value         | bigint      |
erc20_tx_hash       | hex_string  |
erc20_block_number  | bigint      |

使用python从以太坊区块链中提取信息

3 个答案:

标准接口

Python API