hedera 0.43.0

The SDK for interacting with Hedera Hashgraph.
Documentation 
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use hedera::{
    ContractCreateTransaction,
    ContractFunctionParameters,
    ContractId,
    FileId,
    PublicKey,
};

mod bytecode;
mod create;
mod create_flow;
mod delete;
mod execute;
mod info;
mod nonce_info;
mod update;

enum ContractAdminKey {
    Operator,
    // Custom(PrivateKey),
}

const SMART_CONTRACT_BYTECODE: &str = concat!(
    "608060405234801561001057600080fd5b506040516104d73803806104d7833981810160405260208110156100",
    "3357600080fd5b810190808051604051939291908464010000000082111561005357600080fd5b908301906020",
    "82018581111561006857600080fd5b825164010000000081118282018810171561008257600080fd5b82525081",
    "516020918201929091019080838360005b838110156100af578181015183820152602001610097565b50505050",
    "905090810190601f1680156100dc5780820380516001836020036101000a031916815260200191505b50604052",
    "5050600080546001600160a01b0319163317905550805161010890600190602084019061010f565b50506101aa",
    "565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f",
    "1061015057805160ff191683800117855561017d565b8280016001018555821561017d579182015b8281111561",
    "017d578251825591602001919060010190610162565b5061018992915061018d565b5090565b6101a791905b80",
    "8211156101895760008155600101610193565b90565b61031e806101b96000396000f3fe608060405234801561",
    "001057600080fd5b50600436106100415760003560e01c8063368b87721461004657806341c0e1b5146100ee57",
    "8063ce6d41de146100f6575b600080fd5b6100ec6004803603602081101561005c57600080fd5b810190602081",
    "01813564010000000081111561007757600080fd5b82018360208201111561008957600080fd5b803590602001",
    "918460018302840111640100000000831117156100ab57600080fd5b91908080601f0160208091040260200160",
    "405190810160405280939291908181526020018383808284376000920191909152509295506101739450505050",
    "50565b005b6100ec6101a2565b6100fe6101ba565b604080516020808252835181830152835191928392908301",
    "9185019080838360005b83811015610138578181015183820152602001610120565b5050505090509081019060",
    "1f1680156101655780820380516001836020036101000a031916815260200191505b5092505050604051809103",
    "90f35b6000546001600160a01b0316331461018a5761019f565b805161019d906001906020840190610250565b",
    "505b50565b6000546001600160a01b03163314156101b85733ff5b565b60018054604080516020601f60026000",
    "196101008789161502019095169490940493840181900481028201810190925282815260609390929091830182",
    "8280156102455780601f1061021a57610100808354040283529160200191610245565b82019190600052602060",
    "0020905b81548152906001019060200180831161022857829003601f168201915b505050505090505b90565b82",
    "8054600181600116156101000203166002900490600052602060002090601f016020900481019282601f106102",
    "9157805160ff19168380011785556102be565b828001600101855582156102be579182015b828111156102be57",
    "82518255916020019190600101906102a3565b506102ca9291506102ce565b5090565b61024d91905b80821115",
    "6102ca57600081556001016102d456fea264697066735822122084964d4c3f6bc912a9d20e14e449721012d625",
    "aa3c8a12de41ae5519752fc89064736f6c63430006000033"
);

/// Creates a File for [`SMART_CONTRACT_BYTECODE`] and returns the File ID.
///
/// If there's already a file for it, the same file will be used.
///
/// *Deleting the file can cause spurious failures in tests, so, don't do that* (it'll expire in `30 days` anyway).
///
/// This is intended as an optimization (cost wise & network resource wise).
async fn bytecode_file_id(
    client: &hedera::Client,
    op_key: hedera::PublicKey,
) -> hedera::Result<FileId> {
    use time::{
        Duration,
        OffsetDateTime,
    };
    static BYTECODE_FILE: tokio::sync::OnceCell<FileId> = tokio::sync::OnceCell::const_new();

    async fn make_file(
        client: &hedera::Client,
        op_key: hedera::PublicKey,
    ) -> hedera::Result<FileId> {
        let file_id = hedera::FileCreateTransaction::new()
            .keys([op_key])
            .contents(SMART_CONTRACT_BYTECODE)
            .expiration_time(OffsetDateTime::now_utc() + Duration::days(30))
            .execute(client)
            .await?
            .get_receipt(client)
            .await?
            .file_id
            .unwrap();

        log::debug!("created `{file_id}@file`");

        Ok(file_id)
    }

    BYTECODE_FILE.get_or_try_init(|| make_file(client, op_key)).await.copied()
}

async fn create_contract(
    client: &hedera::Client,
    op_key: PublicKey,
    admin_key: impl Into<Option<ContractAdminKey>>,
) -> hedera::Result<ContractId> {
    async fn inner(
        client: &hedera::Client,
        op_key: PublicKey,
        admin_key: Option<ContractAdminKey>,
    ) -> hedera::Result<ContractId> {
        let file_id = bytecode_file_id(client, op_key).await?;

        let mut tx = ContractCreateTransaction::new();

        if let Some(ContractAdminKey::Operator) = admin_key {
            tx.admin_key(op_key);
        }

        let contract_id = tx
            .gas(300_000)
            .constructor_parameters(
                ContractFunctionParameters::new().add_string("Hello from Hedera.").to_bytes(None),
            )
            .bytecode_file_id(file_id)
            .contract_memo("[e2e::ContractCreateTransaction]")
            .execute(client)
            .await?
            .get_receipt(client)
            .await?
            .contract_id
            .unwrap();

        Ok(contract_id)
    }

    inner(client, op_key, admin_key.into()).await
}