hdp 0.9.0

All Herodotus Data Processor
Documentation 
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use alloy::primitives::hex::{self};
use alloy::primitives::{FixedBytes, B256, U256};
use anyhow::Result;
use starknet_crypto::Felt;

/// Convert a `FixedBytes<32>` which originally encoded from utf8 string into original utf8 string value
pub fn fixed_bytes_str_to_utf8_str(input_bytes: FixedBytes<32>) -> Result<String> {
    // Find the position of the first zero byte, if any, to trim the padding.
    let trim_position = input_bytes
        .iter()
        .position(|&x| x == 0)
        .unwrap_or(input_bytes.len());
    Ok(String::from_utf8(input_bytes[..trim_position].to_vec())?)
}

/// Convert a utf8 string into `FixedBytes<32>` by padding zero bytes to the end
pub fn utf8_str_to_fixed_bytes32(s: &str) -> FixedBytes<32> {
    let mut fixed_bytes = [0u8; 32];
    let bytes = s.as_bytes();
    for (i, &byte) in bytes.iter().enumerate().take(32) {
        fixed_bytes[i] = byte;
    }

    FixedBytes::from(fixed_bytes)
}

/// Convert a byte array into a hex string
pub fn bytes_to_hex_string(bytes: &[u8]) -> String {
    format!("0x{}", hex::encode(bytes))
}

/// Convert a hex string into a byte array
pub fn hex_string_to_bytes(hex_string: &str) -> Result<Vec<u8>> {
    let hex_string = hex_string.trim_start_matches("0x");
    Ok(hex::decode(hex_string)?)
}

/// Get the last byte of a byte array as a u8
pub fn last_byte_to_u8(bytes: &[u8]) -> u8 {
    *bytes.last().unwrap_or(&0)
}

/// Convert a transaction index to a transaction key
pub fn tx_index_to_tx_key(tx_index: u64) -> String {
    let binding = alloy_rlp::encode(U256::from(tx_index));
    format!("0x{}", hex::encode(binding))
}

/// Convert a [`Felt`] into a [`FixedBytes<32>`]
pub fn felt_to_bytes32(felt: Felt) -> FixedBytes<32> {
    let felt_bytes = felt.to_bytes_be();
    B256::from(felt_bytes)
}

/// Convert a hex string into integer
pub fn hex_string_to_uint(hex_string: &str) -> u128 {
    let hex_string = hex_string.trim_start_matches("0x");
    u128::from_str_radix(hex_string, 16).expect("Cannot convert hex string to uint")
}

#[cfg(test)]
mod tests {

    use super::*;
    use alloy::primitives::{hex::FromHex, FixedBytes};

    #[test]
    fn test_bytes32_to_str() {
        let value = "0x6d61780000000000000000000000000000000000000000000000000000000000";
        let input = FixedBytes::from_hex(value).unwrap();
        let result = fixed_bytes_str_to_utf8_str(input).unwrap();
        assert_eq!(result, "max".to_string());

        let value = "0x6d696e0000000000000000000000000000000000000000000000000000000000";
        let input = FixedBytes::from_hex(value).unwrap();
        let result = fixed_bytes_str_to_utf8_str(input).unwrap();
        assert_eq!(result, "min".to_string());

        let value = "0x73756d0000000000000000000000000000000000000000000000000000000000";
        let input = FixedBytes::from_hex(value).unwrap();
        let result = fixed_bytes_str_to_utf8_str(input).unwrap();
        assert_eq!(result, "sum".to_string());

        let value = "0x6176670000000000000000000000000000000000000000000000000000000000";
        let input = FixedBytes::from_hex(value).unwrap();
        let result = fixed_bytes_str_to_utf8_str(input).unwrap();
        assert_eq!(result, "avg".to_string());
    }

    #[test]
    fn test_bytes_to_hex_string() {
        let input = [0, 0, 0, 0, 0];
        let result = bytes_to_hex_string(&input);
        assert_eq!(result, "0x0000000000");
        assert_eq!(hex_string_to_bytes(&result).unwrap(), input);

        let input = [0, 0, 0, 9, 2];
        let result = bytes_to_hex_string(&input);
        assert_eq!(result, "0x0000000902");

        let hex = "030fff";
        let input = hex_string_to_bytes(hex).unwrap();
        assert_eq!(input, [3, 15, 255]);
        let result = bytes_to_hex_string(&input);
        assert_eq!(result, "0x030fff");
        assert_eq!(hex_string_to_bytes(&result).unwrap(), input);
    }

    #[test]
    fn test_last_byte_to_u8() {
        let input = [0, 0, 0, 0, 0];
        let result = last_byte_to_u8(&input);
        assert_eq!(result, 0);

        let input = [0, 0, 0, 9, 2];
        let result = last_byte_to_u8(&input);
        assert_eq!(result, 2);

        let input = [0, 0, 0, 9, 255];
        let result = last_byte_to_u8(&input);
        assert_eq!(result, 255);
    }

    #[test]
    fn test_tx_index_to_tx_key() {
        // no rlp prefix
        let tx_index = 127u64;
        let tx_key = tx_index_to_tx_key(tx_index);
        let expected_tx_key = "0x7f".to_string();

        assert_eq!(tx_key, expected_tx_key);

        // rlpx prefix
        let tx_index = 303u64;
        let tx_key = tx_index_to_tx_key(tx_index);
        let expected_tx_key = "0x82012f".to_string();

        assert_eq!(tx_key, expected_tx_key);
    }

    #[test]
    fn test_felt_to_bytes32() {
        let felt =
            Felt::from_hex("0x034d4ff54bc5c6cfee6719bfaa94ffa374071e8d656b74823681a955e9033dd9")
                .unwrap();
        let bytes32 = felt_to_bytes32(felt);
        assert_eq!(bytes32, felt.to_bytes_be());
    }

    #[test]
    fn test_hex_string_to_uint() {
        let hex_string = "0x1b";
        let result = hex_string_to_uint(hex_string);
        assert_eq!(result, 27);
    }
}