hedera 0.39.2

The SDK for interacting with Hedera Hashgraph.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

// SPDX-License-Identifier: Apache-2.0

use std::str::FromStr;

use hedera::{
    AccountBalanceQuery, AccountCreateTransaction, AccountId, BatchTransaction, Client, Hbar, PrivateKey, TransferTransaction
};

#[tokio::main]
#[ignore] // Will currently not be working as the feature is disabled on testnet
async fn main() -> hedera::Result<()> {
    // Create client for testnet (you can also use mainnet or previewnet)
    let client = Client::for_testnet();

    // Set operator (the account that pays for transactions)
    let operator_key = PrivateKey::from_str_ed25519(
        "302e020100300506032b657004220420a869f4c6191b9c8c99933e7f6b6611711737e4b1a1a5a4cb5370e719a1f6df98"
    )?;
    let operator_account = AccountId::from_str("0.0.1001")?;
    client.set_operator(operator_account, operator_key);

    println!("BatchTransaction Example");
    println!("========================");

    // Step 1: Create a batch key
    // This key will be used to sign the batch transaction itself
    let batch_key = PrivateKey::generate_ed25519();
    println!("Generated batch key: {}", batch_key.public_key());

    // Step 2: Create some accounts that will be involved in transfers
    let alice_key = PrivateKey::generate_ed25519();
    let alice = create_account(&client, alice_key.public_key(), Hbar::new(5)).await?;
    println!("Created Alice account: {}", alice);

    let bob_key = PrivateKey::generate_ed25519();
    let bob = create_account(&client, bob_key.public_key(), Hbar::new(3)).await?;
    println!("Created Bob account: {}", bob);

    // Step 3: Create individual transactions and prepare them for batching
    println!("\nPreparing batch transactions...");

    // Create a transfer from Alice to the operator
    let mut alice_transfer = TransferTransaction::new();
    alice_transfer
        .hbar_transfer(alice, Hbar::new(-1)) // Alice sends 1 HBAR
        .hbar_transfer(operator_account, Hbar::new(1)); // Operator receives 1 HBAR

    // Freeze the transaction and set batch key
    alice_transfer.freeze_with(&client)?;
    alice_transfer.set_batch_key(batch_key.public_key().into());
    alice_transfer.sign(alice_key.clone());

    // Create a transfer from Bob to the operator
    let mut bob_transfer = TransferTransaction::new();
    bob_transfer
        .hbar_transfer(bob, Hbar::new(-2)) // Bob sends 2 HBAR
        .hbar_transfer(operator_account, Hbar::new(2)); // Operator receives 2 HBAR

    // Freeze the transaction and set batch key
    bob_transfer.freeze_with(&client)?;
    bob_transfer.set_batch_key(batch_key.public_key().into());
    bob_transfer.sign(bob_key.clone());

    // Step 4: Get balances before batch execution
    println!("\nBalances before batch execution:");
    print_balance(&client, "Alice", alice).await?;
    print_balance(&client, "Bob", bob).await?;
    print_balance(&client, "Operator", operator_account).await?;

    // Step 5: Create and execute the batch transaction
    println!("\nExecuting batch transaction...");

    let mut batch = BatchTransaction::new();
    batch.add_inner_transaction(alice_transfer.into())?;
    batch.add_inner_transaction(bob_transfer.into())?;
    batch.freeze_with(&client)?;
    batch.sign(batch_key);

    // Execute the batch transaction
    let response = batch.execute(&client).await?;
    let receipt = response.get_receipt(&client).await?;

    println!("Batch transaction executed successfully!");
    println!("Transaction ID: {}", response.transaction_id);
    println!("Status: {:?}", receipt.status);

    // Step 6: Get balances after batch execution
    println!("\nBalances after batch execution:");
    print_balance(&client, "Alice", alice).await?;
    print_balance(&client, "Bob", bob).await?;
    print_balance(&client, "Operator", operator_account).await?;

    // Step 7: Get inner transaction IDs
    println!("\nInner transaction IDs:");
    for (i, tx_id) in batch.get_inner_transaction_ids().iter().enumerate() {
        if let Some(id) = tx_id {
            println!("Transaction {}: {}", i + 1, id);
        }
    }

    println!("\nBatchTransaction example completed successfully!");

    Ok(())
}

async fn create_account(
    client: &Client,
    public_key: hedera::PublicKey,
    initial_balance: Hbar,
) -> hedera::Result<AccountId> {
    let response = AccountCreateTransaction::new()
        .set_key_without_alias(public_key)
        .initial_balance(initial_balance)
        .execute(client)
        .await?;

    let receipt = response.get_receipt(client).await?;
    receipt.account_id.ok_or_else(|| {
        hedera::Error::TimedOut(Box::new(hedera::Error::GrpcStatus(
            tonic::Status::not_found("account_id not found in receipt"),
        )))
    })
}

async fn print_balance(client: &Client, name: &str, account_id: AccountId) -> hedera::Result<()> {
    let balance = AccountBalanceQuery::new()
        .account_id(account_id)
        .execute(client)
        .await?;
    println!("{}: {} HBAR", name, balance.hbars);
    Ok(())
}