Ethereum RPC Client

Python client for Ethereum JSON RPC Server

Note that this currently only implements a handful of the JSON RPC methods exposed by the server.

Installation

Install with pip

$ pip install ethereum-rpc-client

Basic Usage

Assuming you have an Ethereum node running the JSON RPC server on localhost:8454

>>> from eth_rpc_client import Client
>>> client = Client(host="127.0.0.1", port="8545")
>>> client.get_coinbase()
... '0xd3cda913deb6f67967b99d67acdfa1712c293601'

API

Client.get_coinbase()

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

Returns the hex encoded coinbase.

Client.get_gas_price()

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

Returns the gas price in wei as an integer

Client.get_balance(address, block="latest")

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

• address: The hex encoded address to lookup the balance for.
• block: The block to use for the lookup.

Returns the account balance for the address in wei as an integer.

Client.get_code(address, block="latest")

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

• address: The hex encoded address to lookup the code for.
• block: The block to use for the lookup.

Returns the code at the given address.

Client.call(_from=None, to=None, gas=None, gas_price=None, value=0, data=None, block="latest")

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

• _from: The hex encoded address to use as the source for the call.
• to: The hex encoded address of the contract for the call.
• gas: Integer gas alotment for the call.
• gas_price: Integer gas price in wei.
• value: Integer amount in wei to send with the call.
• data: The call data.

Returns the call response.

Client.get_transaction_receipt(txn_hash)

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

• txn_hash: The hex encoded transaction hash to lookup.

Returns a dictionary of the transaction receipt or None if no receipt is found.

• transactionHash: hex encoded hash of the transaction.
• transactionIndex: integer of the transactions index position in the block.
• blockHash: hex encoded hash of the block where this transaction was in.
• blockNumber: integer block number where this transaction was in.
• cumulativeGasUsed: The total amount of gas used when this transaction was executed in the block.
• gasUsed: The amount of gas used by this specific transaction alone.
• contractAddress: The contract address created, if the transaction was a contract creation, otherwise null.
• logs: list of log objects, which this transaction generated

Client.get_transaction_by_hash(txn_hash)

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

• txn_hash: The hex encoded transaction hash to lookup.

Returns a dictionary of the transaction values or None if no transaction is found.

* **hash**: DATA, 32 Bytes - hash of the transaction.
* **nonce**: QUANTITY - the number of transactions made by the sender prior to this one.
* **blockHash**: DATA, 32 Bytes - hash of the block where this transaction was in. null when its pending.
* **blockNumber**: QUANTITY - block number where this transaction was in. null when its pending.
* **transactionIndex**: QUANTITY - integer of the transactions index position in the block. null when its pending.
* **from**: DATA, 20 Bytes - address of the sender.
* **to**: DATA, 20 Bytes - address of the receiver. null when its a contract creation transaction.
* **value**: QUANTITY - value transferred in Wei.
* **gasPrice**: QUANTITY - gas price provided by the sender in Wei.
* **gas**: QUANTITY - gas provided by the sender.
* **input**: DATA - the data send along with the transaction.

Client.get_block_number()

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

Returns the number of the most recent block.

Client.get_accounts()

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

Returns a list of the addresses owned by the client.

Helpers

Client.get_max_gas()

Returns the gas limit from the latest block

Client.wait_for_transaction(txn_hash, max_wait=60)

Blocks for up to max_wait seconds, polling for the transaction receipt for the provided txn_hash. Returns the transaction hash.

Client.wait_for_block(block_number, max_wait=60)

Blocks for up to max_wait seconds, polling the rpc server until the block specified by block_number is seen. Returns the block.