Exth

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Exth is an Elixir client for interacting with EVM-compatible blockchain nodes via JSON-RPC. It provides a robust, type-safe interface for making Ethereum RPC calls.

Features

  • 🔒 Type Safety: Comprehensive type specs and validation
  • 🔄 Transport Agnostic: Pluggable transport system (HTTP, WebSocket, IPC)
  • 🎯 Smart Defaults: Sensible defaults with full configurability
  • 🛡️ Error Handling: Detailed error reporting and recovery
  • 📦 Batch Support: Efficient batch request processing
  • 🔌 Protocol Compliance: Full JSON-RPC 2.0 specification support

Installation

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

def deps do
  [
    {:exth, "~> 0.1.0"},
    # Optional dependencies:
    # Mint for Tesla adapter
    {:mint, "~> 1.7"}
  ]
end

Quick Start

  1. Define your client module:
defmodule MyClient do
  use Exth.Provider,
    transport_type: :http,
    rpc_url: "https://YOUR-RPC-URL"
end
  1. Make RPC calls:
# Get the latest block number
{:ok, block_number} = MyClient.block_number()

# Get balance for an address
{:ok, balance} = MyClient.get_balance(
  "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "latest"
)

# Get block by number with full transactions
{:ok, block} = MyClient.get_block_by_number("0x1", true)

# Send raw transaction
{:ok, tx_hash} = MyClient.send_raw_transaction("0x...")

Configuration

Transport Options 

# HTTP Transport
config = [
  transport_type: :http,
  rpc_url: "https://eth-mainnet.example.com",
  headers: [{"authorization", "Bearer token"}],
  timeout: 30_000
]

# Custom Transport
config = [
  transport_type: :custom,
  rpc_url: "custom://endpoint",
  module: MyCustomTransport
]

Client Options 

defmodule MyClient do
  use Exth.Provider,
    transport_type: :http,
    rpc_url: "https://eth-mainnet.example.com",
    headers: [
      {"authorization", "Bearer token"}
    ],
    timeout: 30_000
end

Error Handling

Exth provides detailed error information:

case MyClient.get_balance("0x123...", "latest") do
  {:ok, balance} ->
    # Handle success
    balance

  {:error, %{code: code, message: msg}} ->
    # Handle RPC error
    Logger.error("RPC Error: #{code} - #{msg}")

  {:error, reason} ->
    # Handle other errors
    Logger.error("Error: #{inspect(reason)}")
end

Requirements

  • Elixir ~> 1.18
  • Erlang/OTP 26 or later

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b feature/my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin feature/my-new-feature)
  5. Create new Pull Request

License

This project is licensed under the MIT License. See LICENSE for details.