scala-rpc (Bitcoin and Ethereum JSON RPC client)

Scala client library for different blockchain nodes. Currently, Bitcoin and Ethereum are supported Litecoin, Bitcoin cash and other Bitcoin-like nodes should be supported as well

This is RPC client library for connecting to bitcoind and geth/parity nodes. Please, consider this library as experimental. API in future can be changed.

This library is not replacement of Bitcoin/Ethereum nodes. It connects to nodes using http json rpc protocol.

Supports non-blocking IO

Different http transport libraries are supported. Currently there are implementations using:

Spring's WebClient (for non-blocking IO).
scalaj-http for blocking IO

Library uses Typelevel's https://github.com/typelevel/cats to support different types of results (Try for blocking API and Mono for Spring's WebClient)

Features

Library is modular and provides different layers:

thin layer over JSON RPC
different transaction senders for Ethereum (you can use the same API for sending transactions and sign them in the node or sign them right in Java code, from your client)
common blockchain listeners for Bitcoin/Ethereum: you can listen to different events using the same api for both blockchains
contract wrappers for Ethereum

Adding dependencies (Maven)

Add bintray daonomic repository

<repositories>
    <repository>
        <id>daonomic-bintray</id>
        <name>daonomic-bintray</name>
        <url>https://dl.bintray.com/daonomic/maven/</url>
    </repository>
</repositories>

Add scalether dependency

<dependency>
    <groupId>io.daonomic.scalether</groupId>
    <artifactId>contract_2.13</artifactId>
    <version>${scalether.version}</version>
</dependency>

Adding dependencies (sbt)

Add bintray daonomic repository

resolvers += Resolver.bintrayRepo("daonomic", "maven")

Add scalether dependency

libraryDependencies += "io.daonomic.scalether" %% "contract" % scaletherVersion

Writing some code

see https://github.com/daonomic/scala-rpc/tree/master/scalether for Ethereum examples

and https://github.com/daonomic/scala-rpc/tree/master/bitcoin for Bitcoin examples

For information about smart contract wrappers generator see https://github.com/daonomic/scalether-maven-plugin

Suggestions

You are welcome to suggest features and report bugs found!

License

scala-rpc is available under MIT License.

njovy/scala-rpc