rust-web3

Ethereum JSON-RPC multi-transport client. Rust implementation of Web3.js library.

Documentation

Usage

First, add this to your Cargo.toml:

[dependencies]
web3 = { git = "https://github.com/tomusdrw/rust-web3" }

Example

#[tokio::main]asyncfnmain() -> web3::Result<()>{let transport = web3::transports::Http::new("http://localhost:8545")?;let web3 = web3::Web3::new(transport);println!("Calling accounts.");letmut accounts = web3.eth().accounts().await?;println!("Accounts: {:?}", accounts);
accounts.push("00a329c0648769a73afac7f9381e08fb43dbea72".parse().unwrap());println!("Calling balance.");for account in accounts {let balance = web3.eth().balance(account,None).await?;println!("Balance of {:?}: {}", account, balance);}Ok(())}

If you want to deploy smart contracts you have written you can do something like this (make sure you have the solidity compiler installed):

solc -o build --bin --abi contracts/*.sol

The solidity compiler is generating the binary and abi code for the smart contracts in a directory called contracts and is being output to a directory called build.

For more see examples folder.

Opt-out Features

• http - Enables HTTP transport (requires tokio runtime, because of hyper).
• http-tls - Enables TLS support for HTTP transport (implies http).
• ws - Enables WS transport.
• ws-tls - Enables TLS support for WS transport (implies ws).

Futures migration

• Get rid of parking_lot (replace with async-aware locks if really needed).
• Consider getting rid of Unpin requirements. (#361)
• WebSockets: TLS support (#360)
• WebSockets: Reconnecting & Pings
• Consider using tokio instead of async-std for ws.rs transport (issue with test).
• Restore IPC Transport

General

• More flexible API (accept Into<X>)
• Contract calls (ABI encoding; debris/ethabi)
• Batch Requests

Transports

• HTTP transport
• IPC transport
• WebSockets transport

Types

• Types for U256,H256,Address(H160)
• Index type (numeric, encoded to hex)
• Transaction type (Transaction from Parity)
• Transaction receipt type (TransactionReceipt from Parity)
• Block type (RichBlock from Parity)
• Work type (Work from Parity)
• Syncing type (SyncStats from Parity)

APIs

• Eth: eth_*
• Eth filters: eth_*
• Eth pubsub: eth_*
• net_*
• web3_*
• personal_*
• traces_*

Parity-specific APIs

• Parity read-only: parity_*

• Parity accounts: parity_* (partially implemented)

• Parity set: parity_*

• signer_*

• Own APIs (Extendable)

let web3 = Web3::new(transport);
web3.api::<CustomNamespace>().custom_method().wait().unwrap()

Installation on Windows

Currently, Windows does not support IPC, which is enabled in the library by default. To complile, you need to disable the IPC feature:

web3 = { version = "0.11.0", default-features = false, features = ["http"] }

Cargo Features

The library supports following features:

• http - Enables http transport.
• http-tls - Enables http over TLS (https) transport support. Implies http.
• ws-tokio - Enables ws tranport (tokio runtime).
• ws-tls-tokio - Enables wss tranport (tokio runtime).
• ws-async-std - Enables ws tranport (async-std runtime).
• ws-tls-async-std - Enables wss tranport (async-std runtime).

By default http-tls and ws-tls-tokio are enabled.