near-jsonrpc-client

Lower-level API for interfacing with the NEAR Protocol via JSONRPC.

Usage

Each one of the valid JSON RPC methods are defined in the methods module. For instance, to make a tx request, you start with the tx module and construct a request using the methods::tx::RpcTransactionStatusRequest struct.

use near_jsonrpc_client::{methods, JsonRpcClient};
use near_jsonrpc_primitives::types::transactions::TransactionInfo;

let mainnet_client = JsonRpcClient::connect("https://archival-rpc.mainnet.near.org");

let tx_status_request = methods::tx::RpcTransactionStatusRequest {
    transaction_info: TransactionInfo::TransactionId {
        hash: "9FtHUFBQsZ2MG77K3x3MJ9wjX3UT8zE1TczCrhZEcG8U".parse()?,
        account_id: "miraclx.near".parse()?,
    },
};

// call a method on the server via the connected client
let tx_status = mainnet_client.call(tx_status_request).await?;

println!("{:?}", tx_status);

Check out the examples folder for a comprehensive list of helpful demos. You can run the examples with cargo. For example: cargo run --example view_account.

For all intents and purposes, the predefined structures in methods should suffice, if you find that they don't or you crave extra flexibility, well, you can opt in to use the generic constructor methods::any() with the any feature flag.

In this example, we retrieve only the parts from the genesis config response that we care about.

# in Cargo.toml
near-jsonrpc-client = { ..., features = ["any"] }

use serde::Deserialize;
use serde_json::json;

use near_jsonrpc_client::{methods, JsonRpcClient};
use near_primitives::serialize::u128_dec_format;
use near_primitives::types::*;

#[derive(Debug, Deserialize)]
struct PartialGenesisConfig {
    protocol_version: ProtocolVersion,
    chain_id: String,
    genesis_height: BlockHeight,
    epoch_length: BlockHeightDelta,
    #[serde(with = "u128_dec_format")]
    min_gas_price: Balance,
    #[serde(with = "u128_dec_format")]
    max_gas_price: Balance,
    #[serde(with = "u128_dec_format")]
    total_supply: Balance,
    validators: Vec<AccountInfo>,
}

impl methods::RpcHandlerResponse for PartialGenesisConfig {}

let mainnet_client = JsonRpcClient::connect("https://rpc.mainnet.near.org");

let genesis_config_request = methods::any::<Result<PartialGenesisConfig, ()>>(
    "EXPERIMENTAL_genesis_config",
    json!(null),
);

let partial_genesis = mainnet_client.call(genesis_config_request).await?;

println!("{:#?}", partial_genesis);

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.