Solana: Decoding data from accountSubscribe Websocket method. RUST

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Decoding data from AccountSubscribe Websocket Method in Solana with RUST

The accountSubscribe WSS (WebSockets Subscriptions) method is a powerful tool for fetching subscription-related data on the Solana blockchain. When used correctly, it can provide valuable insights into your asset’s vault holdings and transactions. However, decoding the base64-encoded JSON payload received from the server can be challenging.

In this article, we will explore how to decode the data sent by accountSubscribe using RUST, focusing on the specific requirements of Solana-based wallet addresses, such as “base” and “quote” assets.

Prerequisites

Before diving into the code, ensure you have:

• A Solana node running (e.g., Solflare)

• The solana-websocket crate is installed in your RUST project

• Basic understanding of Solana’s accountSubscribe API

Sample Code

Below is an example of how to fetch data from accountSubscribe using the solana-websocket crate:

use solana_sdk :: { AccountInfo , PubKey } ;

use solana_websocket::{SubscriptionResponse, SubscriptionOptions};


#[tokyo::main]

async fn main() {

    // Initialize your Solana node

    let ( context , accounts ) = tokyo :: spawn ( solana_node :: sun ( ) ) ;


    // Subscribe to accountSubscribe events

    let subscription_options = SubscriptionOptions::new(

        contextpubkey,

        Pubkey::new("your-accounts"),

    );

    let subscription_response = tokyo::run(subscription_options);


    // Parse the response as JSON

    let json: send_json::Value = send_json::from_str(&subscription_response).unwrap();


    // Loop through each account and print its details

    for (account_id, info) in json["accounts"].iter() {

        println!("Account ID: {}", account_id);

        println!("Pubkey: {}", info.pubkey.to_string());

        println!("Owner: {}", info.owner.value());

        println!("Type: {}", info.type_.value());

        // ...

    } }

} }


// Define the subscription options

#[derive(Default)]

struct SubscriptionOptions { .

    pubkey: Pubkey,

} }

In this example, we initialize a Solana node using tokyo::spawn, then subscribe to accountSubscribe events. We parse the response as JSON and loop through each account, printing its details.

Decoding Base64-Encoded Data

When receiving the JSON response from accountSubscribe, it is base64-encoded. To decode this data, we can use the following steps:

• Unpack the response into a JSON object using serde_json::from_str.

• Decode any binary data within the JSON object.

Here’s an example of how to handle these steps:

use service::{Deserialize, Serialize};

use base64;


#[derive(Default)]

struct SubscriptionResponse { .

    accounts : Vec  ,

} }


impl serde_json::Map for SubscriptionResponse {

    fn get(&self, key:&str)->Option {

        match self [ key ] {

            Some ( value ) => value ,

            None => None,

        } }

    } }


    fn as_bytes (&self) -> Option<Vec> {

        match self.as_ref() {

            Some(map) => map.get("accounts").map(|value|base64::decode(value).unwrap()),

            _ => None,

        } }

    } }

} }

In this example, we define a SubscriptionResponse struct that implements serde_json::Map. We also implement the necessary methods to handle decoding binary data within the JSON object.

Finally, when parsing the response as JSON and calling as_bytes, we use the base64::decode method to decode any binary data present in the JSON object. If no binary data is found, the method returns None.

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