Ethereumex

Elixir JSON-RPC client for the Ethereum blockchain

Installation

Add Ethereumex to your mix.exs dependencies:

Add ethereumex to your list of dependencies in mix.exs:

def deps do
  [{:ethereumex, "~> 0.3.0"}]
end

Ensure ethereumex is started before your application:

def application do
  [applications: [:ethereumex]]
end

Configuration

In config/config.exs, add Ethereum protocol host params to your config file

config :ethereumex,
  url: "http://localhost:8545"

Usage

Available methods:

web3_clientVersion
web3_sha3
net_version
net_peerCount
net_listening
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_compileLLL
eth_compileSolidity
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_post
shh_version
shh_newIdentity
shh_hasIdentity
shh_newGroup
shh_addToGroup
shh_newFilter
shh_uninstallFilter
shh_getFilterChanges
shh_getMessages

Examples

iex> Ethereumex.HttpClient.web3_client_version
{:ok, "Parity//v1.7.2-beta-9f47909-20170918/x86_64-macos/rustc1.19.0"}

iex> Ethereumex.HttpClient.web3_sha3("wrong_param")
{:error, %{"code" => -32602, "message" => "Invalid params: invalid format."}}

iex> Ethereumex.HttpClient.eth_get_balance("0x407d73d8a49eeb85d32cf465507dd71d507100c1")
{:ok, "0x0"}

Note that all method names are snakecases, so, for example, shh_getMessages method has corresponding Ethereumex.HttpClient.shh_get_messages/1 method. Signatures can be found in Ethereumex.Client.Behaviour. There are more examples in tests.

Custom requests

Many Ethereum protocol implementations support additional JSON-RPC API methods. To use them, you should call Ethereumex.HttpClient.request/3 method.

For example, let's call parity's personal_listAccounts method.

iex> Ethereumex.HttpClient.request("personal_listAccounts", [], [])
{:ok,
 ["0x71cf0b576a95c347078ec2339303d13024a26910",
  "0x7c12323a4fff6df1a25d38319d5692982f48ec2e"]}

Batch requests

To send batch requests use Ethereumex.HttpClient.batch_request/1 method.

requests = [
   {:web3_client_version, []},
   {:net_version, []},
   {:web3_sha3, ["0x68656c6c6f20776f726c64"]}
 ]
 Ethereumex.HttpClient.batch_request(requests)
 {
   :ok,
   [
     "Parity//v1.7.2-beta-9f47909-20170918/x86_64-macos/rustc1.19.0",
     "42",
     "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad"
   ]
 }

Contributing

Fork it!
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request

Author

Ayrat Badykov (@ayrat555)

License

Ethereumex is released under the MIT License.

the-kenny / ethereumex