EOSIO SDK for Java: RPC Provider

An RPC provider implementation for use within EOSIO SDK for Java as a plugin. RPC providers are responsible for all RPC calls to nodeos, as well as general network handling.

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Contents

• Prerequisites
• Installation
• Direct Usage
• Releases
• Want to Help?
• License & Legal

Prerequisites

• Eclipse 4.5+
• Gradle 4.10.1+
• Gradle Plugin 3.3.0+
• Java SE 8+

This project is compatible with server-side Java, as well as Android 6+. Therefore, any project depending on Java RPC Provider with EOSIO SDK for Java must be a server-side Java or Android 6+ project.

Other RPC providers can be created to support earlier Android versions or other platforms. If your project requires support for earlier Android versions or alternate platforms, or if you'd like to create an RPC provider and have questions, please reach out to us by logging an issue.

Installation

Java RPC Provider is intended to be used in conjunction with EOSIO SDK for Java as a provider plugin.

To use Java RPC Provider with EOSIO SDK for Java in your app, add the following modules to your build.gradle:

implementation 'one.block:eosiojava:1.0.0'
implementation 'one.block:eosio-java-rpc-provider:1.0.0'

The build.gradle files for the project currently include configurations for publishing the project to Artifactory. These should be removed if you are not planning to use Artifactory or you will encounter build errors. To do so, make the changes marked by comments throughout the files.

Then refresh your gradle project.

Now Java RPC Provider is ready for use within EOSIO SDK for Java according to the EOSIO SDK for Java - Basic Usage instructions.

Direct Usage

If you wish to use Java RPC Provider directly, its public methods can be called like this:

// Synchronous call
EosioJavaRpcProviderImpl rpcProvider = new EosioJavaRpcProviderImpl(
    "https://mytestblockchain.net/"
);
GetRawAbiRequest request = new GetRawAbiRequest("eosio.token");
GetRawAbiResponse response = rpcProvider.getRawAbi(request);
String abi = response.getAbi();
String abiHash = response.getAbiHash();

Please note that only the following five RPC endpoints have proper response marshalling:

 Call<GetInfoResponse> getInfo();
 Call<GetBlockInfoResponse> getBlockInfo(@Body GetBlockInfoRequest getBlockInfoRequest);
 Call<GetRawAbiResponse> getRawAbi(@Body GetRawAbiRequest getRawAbiRequest);
 Call<GetRequiredKeysResponse> getRequiredKeys(@Body GetRequiredKeysRequest getRequiredKeysRequest);
 Call<SendTransactionResponse> sendTransaction(@Body SendTransactionRequest sendTransactionRequest);

The remaining endpoints accept a RequestBody as the request object and return a raw JSON string as the response. We aim to continue improving response marshalling for all endpoints, and we invite you to help us improve responses too. Check EosioJavaRpcProviderImpl for more details.

Here is an example demonstrating how to call RPC endpoints and handle the raw JSON string responses returned:

EosioJavaRpcProviderImpl rpcProvider = new EosioJavaRpcProviderImpl("https://mytestblockchain.net/");

String getCurrentBalanceRequestJSON = "{\n" +
            "\t\"code\" : \"eosio.token\"\n" +
            "\t\"account\" : \"test_account\"\n" +
            "}";
RequestBody requestBody = RequestBody.create(okhttp3.MediaType.parse("application/json; charset=utf-8"), getCurrentBalanceRequestJSON);
String response = rpcProvider.getCurrencyBalance(requestBody);
JSONArray jsonArray = new JSONArray(response);
String balance = jsonArray.getString(0);

More Examples

Additional examples can be found in our EXAMPLES.md document.

Releases

• 11/05/2020 - Version 1.0.0 - Support for EOSIO 3.0 functionality, including action return values and KV tables. Project jar implementation that works on both Android and server-side Java.
• 10/22/2020 - Version 0.1.4 - This version consumes the eosio-java library version 0.1.5 and adds support for the get_block_info and get_kv_table_rows endpoints. GetBlockInfo has replaced GetBlock in the IRPCProvider interface since it is the preferred method for getting the information required to calculate TAPOS. GetBlock is still available. PushTransaction has been removed from IRPCProvider in favor of SendTransaction. PushTransaction is still available.
• 10/09/2020 - Version 0.1.3 - This version consumes the eosio-java library version 0.1.3 and adds support for the send_transaction endpoint, and return values.
• 10/01/2020 - Version 0.1.1 - This version consumes the eosio-java library version 0.1.2 and provides functionality equal to the older eosio-java-android-rpc-provider 0.1.1 release.

Want to help?

Interested in contributing? That's awesome! Here are some Contribution Guidelines and the Code of Conduct.

We're always looking for ways to improve EOSIO SDK for Java: Java RPC Provider. Check out our #enhancement Issues for ways you can pitch in.

License

MIT

Important

See LICENSE for copyright and license terms. Block.one makes its contribution on a voluntary basis as a member of the EOSIO community and is not responsible for ensuring the overall performance of the software or any related applications. We make no representation, warranty, guarantee or undertaking in respect of the software or any related documentation, whether expressed or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall we be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or documentation or the use or other dealings in the software or documentation. Any test results or performance figures are indicative and will not reflect performance under all conditions. Any reference to any third party or third-party product, service or other resource is not an endorsement or recommendation by Block.one. We are not responsible, and disclaim any and all responsibility and liability, for your use of or reliance on any of these resources. Third-party resources may be updated, changed or terminated at any time, so the information here may be out of date or inaccurate. Any person using or offering this software in connection with providing software, goods or services to third parties shall advise such third parties of these license terms, disclaimers and exclusions of liability. Block.one, EOSIO, EOSIO Labs, EOS, the heptahedron and associated logos are trademarks of Block.one.

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