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| Block Chain | ||
| =========== | ||
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| Contents: | ||
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| .. toctree:: | ||
| :maxdepth: 2 | ||
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| tips | ||
| ethereum | ||
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| Ethereum | ||
| ======== | ||
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| https://www.infura.io/register | ||
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| .. code-block:: python | ||
| from eth_account.messages import defunct_hash_message | ||
| from solc import compile_source | ||
| from web3 import Web3 | ||
| from web3.providers.rpc import HTTPProvider | ||
| endpoint_url = 'https://ropsten.infura.io/v3/549a3096fb7d410381ba844e3930cfc5' | ||
| web3 = Web3(HTTPProvider(endpoint_url)) | ||
| # https://web3py.readthedocs.io/en/latest/web3.eth.account.html | ||
| def create_keys(): | ||
| account = web3.eth.account.create() | ||
| return account.address, account.privateKey | ||
| def sign_message(text, private_key): | ||
| message_hash = defunct_hash_message(text=text) | ||
| signed_message = web3.eth.account.signHash(message_hash, private_key=private_key) | ||
| return message_hash, signed_message | ||
| def verify_message(text, signed_message): | ||
| message_hash = defunct_hash_message(text=text) | ||
| recover = web3.eth.account.recoverHash(message_hash, signature=signed_message.signature) | ||
| return recover | ||
| def verify_message_from_message_hash(message_hash, signature): | ||
| recover = web3.eth.account.recoverHash(message_hash, signature=signature) | ||
| return recover | ||
| # Solidity source code | ||
| contract_source_code = ''' | ||
| pragma solidity ^0.4.21; | ||
| contract Greeter { | ||
| string public greeting; | ||
| function Greeter() public { | ||
| greeting = 'Hello'; | ||
| } | ||
| function setGreeting(string _greeting) public { | ||
| greeting = _greeting; | ||
| } | ||
| function greet() view public returns (string) { | ||
| return greeting; | ||
| } | ||
| } | ||
| ''' | ||
| address, pk = create_keys() | ||
| address = web3.toChecksumAddress(address) | ||
| compiled_sol = compile_source(contract_source_code) # Compiled source code | ||
| contract_interface = compiled_sol['<stdin>:Greeter'] | ||
| print('web3.eth.blockNumber', web3.eth.blockNumber) | ||
| abi, bytecode = contract_interface['abi'], contract_interface['bin'] | ||
| contract = web3.eth.contract(bytecode=bytecode, abi=abi) | ||
| print('address', address) | ||
| # sample valid address | ||
| to_address = web3.toChecksumAddress('0x7f508c2666a3b40598572d7232ec4fb95162fd9a') | ||
| transaction = { | ||
| 'to': to_address, | ||
| 'value': 1000000000000000000, | ||
| 'gas': 4700000, | ||
| 'gasPrice': web3.eth.gasPrice, | ||
| 'nonce': web3.eth.getTransactionCount(address) | ||
| } | ||
| tx = contract.buildTransaction(transaction).setGreeting('Omid') | ||
| signed = web3.eth.account.signTransaction(tx, pk) | ||
| final = web3.eth.sendRawTransaction(signed.rawTransaction) | ||
| print('final', final) | ||
| print('fin:', web3.toHex(final)) | ||
| ############################### | ||
| transaction = { | ||
| 'to': to_address, | ||
| 'value': 1000000000000000000, | ||
| 'gas': 4700000, | ||
| 'gasPrice': web3.eth.gasPrice, | ||
| 'nonce': web3.eth.getTransactionCount(address), | ||
| 'data': b'A' * 32655 | ||
| } | ||
| signed = web3.eth.account.signTransaction(transaction, pk) | ||
| final = web3.eth.sendRawTransaction(signed.rawTransaction) | ||
| print('final', final) | ||
| print('fin:', web3.toHex(final)) | ||
| ############################### | ||
| Solidity | ||
| -------- | ||
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| https://github.com/ethereum/py-solc | ||
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| .. code-block:: bash | ||
| $ pip install py-solc | ||
| $ python -m solc.install v0.4.21 | ||
| $ export PATH="~/.py-solc/solc-v0.4.21/bin/:$PATH" | ||
| Online solidity | ||
| --------------- | ||
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| https://remix.ethereum.org/#optimize=true&version=builtin | ||
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| https://ethereum.github.io/browser-solidity/#optimize=false&version=soljson-v0.4.25-nightly.2018.9.10+commit.86d85025.js | ||
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| Links | ||
| -------- | ||
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| https://ropsten.etherscan.io/tx/ | ||
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| https://hackernoon.com/ethereum-smart-contracts-in-python-a-comprehensive-ish-guide-771b03990988 | ||
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| https://chrome.google.com/webstore/detail/metamask/nkbihfbeogaeaoehlefnkodbefgpgknn?hl=en | ||
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| https://ethereum.stackexchange.com/questions/11495/best-way-to-test-a-smart-contract | ||
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| https://metamask.io/ | ||
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| https://faucet.metamask.io/ | ||
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| https://gist.github.com/Kcrong/1f832a2f4ab861da3d852c5b0a30ef47 | ||
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| http://justin.yackoski.name/winp/ | ||
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| https://web3py.readthedocs.io/en/stable/contracts.html#contract-deployment-example |
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| Tips | ||
| ==== | ||
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