ethjsonrpc

Python client for Ethereum using the JSON-RPC interface

complete: implements all 62 JSON-RPC methods plus several client-specific methods
provides a high-level interface to create contracts on the blockchain and to call contract methods

Important note

The API is not yet stable, so please use caution when upgrading.

Installation

You may need additional libraries and tools before installing ethjsonrpc.

On Ubuntu 16.04:

$ sudo apt install python-minimal
$ sudo apt install gcc
$ sudo apt install virtualenv  # optional but recommended
$ sudo apt install libpython-dev
$ sudo apt install libssl-dev

On Ubuntu 14.04:

$ sudo apt-get install python-virtualenv  # optional but recommended
$ sudo apt-get install libpython-dev
$ sudo apt-get install libssl-dev

To install ethjsonrpc:

$ pip install ethjsonrpc

Make sure to have a node running an Ethereum client (such as geth) for the library to connect to.

Example

>>> from ethjsonrpc import EthJsonRpc  # to use Parity-specific methods, import ParityEthJsonRpc
>>> c = EthJsonRpc('127.0.0.1', 8545)
>>> c.net_version()
u'1'
>>> c.web3_clientVersion()
u'Geth/v1.3.3/linux/go1.5.1'
>>> c.eth_gasPrice()
50000000000
>>> c.eth_blockNumber()
828948

High-level functionality

These examples assume the following simple Solidity contract:

contract Example {

    string foo;

    function set_foo(string new_foo) {
        foo = new_foo;
    }

    function get_foo() returns (string) {
        return foo;
    }
}

Compile it like this:

$ solc --bin --abi example.sol

Setup

>>> compiled = '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'
>>> from ethjsonrpc import EthJsonRpc  # to use Parity-specific methods, import ParityEthJsonRpc
>>> c = EthJsonRpc('127.0.0.1', 8545)

Deploy contract to the blockchain

>>> contract_tx = c.create_contract(c.eth_coinbase(), compiled, gas=300000)
>>> # wait here for the contract to be created when a new block is mined
>>> contract_addr = c.get_contract_address(contract_tx)
>>> contract_addr
u'0x24988147f2f2300450103d8c42c43182cf226857'

Calling a contract function with a transaction (storing data)

>>> # continued from above
>>> tx = c.call_with_transaction(c.eth_coinbase(), contract_addr, 'set_foo(string)', ['Hello, world'])
>>> tx
u'0x15bde63d79466e3db5169a913bb2069130ca387033d2ff2e29f4dfbef1bc6e0d'

Calling a contract function on the local blockchain (reading data)

>>> # continued from above
>>> results = c.call(contract_addr, 'get_foo()', [], ['string'])
>>> results
['Hello, world']

Calling a transfer() method in ERC20 contract

>>> tx = c.call_with_transaction(c.eth_coinbase(), contract_addr, 'transfer(address, uint256)',['0xe38F16E3d3955f21Cbf0bD0b250112ca0720a2Df',10])

Calling a balanceOf() method in ERC20 contract

>>> c.call(c.eth_coinbase(), 'balanceOf(address)', ['0xe38F16E3d3955f21Cbf0bD0b250112ca0720a2Df'], ['uint256'])
[10]

Using Infura

If you want to use the `Infura<https://infura.io/#how-to>`_ node, you need call the constructor this way:

>>> from ethjsonrpc import EthJsonRpc
>>> c = EthJsonRpc('network.infura.io/YoUrInFuRaApIkEy', 443, tls=True)

Remember to replace YoUrInFuRaApIkEy with your api key

Additional examples

Please see test.py for additional examples.

Implemented JSON-RPC methods

web3_clientVersion
web3_sha3
net_version
net_listening
net_peerCount
eth_protocolVersion
eth_syncing
eth_coinbase
eth_mining
eth_hashrate
eth_gasPrice
eth_accounts
eth_blockNumber
eth_getBalance
eth_getStorageAt
eth_getTransactionCount
eth_getBlockTransactionCountByHash
eth_getBlockTransactionCountByNumber
eth_getUncleCountByBlockHash
eth_getUncleCountByBlockNumber
eth_getCode
eth_sign
eth_sendTransaction
eth_sendRawTransaction
eth_call
eth_estimateGas
eth_getBlockByHash
eth_getBlockByNumber
eth_getTransactionByHash
eth_getTransactionByBlockHashAndIndex
eth_getTransactionByBlockNumberAndIndex
eth_getTransactionReceipt
eth_getUncleByBlockHashAndIndex
eth_getUncleByBlockNumberAndIndex
eth_getCompilers
eth_compileSolidity
eth_compileLLL
eth_compileSerpent
eth_newFilter
eth_newBlockFilter
eth_newPendingTransactionFilter
eth_uninstallFilter
eth_getFilterChanges
eth_getFilterLogs
eth_getLogs
eth_getWork
eth_submitWork
eth_submitHashrate
db_putString
db_getString
db_putHex
db_getHex
shh_version
shh_post
shh_newIdentity
shh_hasIdentity
shh_newGroup
shh_addToGroup
shh_newFilter
shh_uninstallFilter
shh_getFilterChanges
shh_getMessages

Parity-only JSON-RPC methods

To use these methods, make sure that you're

running Parity as your client
running with the --tracing on option
using this library's ParityEthJsonRpc client (not the vanilla EthJsonRpc client)

Methods:

trace_filter
trace_get
trace_transaction
trace_block
trace_rawTransaction

fmorisan/ethjsonrpc