cryo_freeze 0.3.2

cryo is the easiest way to extract blockchain data to parquet, csv, or json
Documentation 
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use crate::*;
use ethers::prelude::*;
use polars::prelude::*;

/// columns for transactions
#[cryo_to_df::to_df(Datatype::CodeDiffs)]
#[derive(Default)]
pub struct CodeDiffs {
    pub(crate) n_rows: u64,
    pub(crate) block_number: Vec<Option<u32>>,
    pub(crate) transaction_index: Vec<Option<u32>>,
    pub(crate) transaction_hash: Vec<Option<Vec<u8>>>,
    pub(crate) address: Vec<Vec<u8>>,
    pub(crate) from_value: Vec<Vec<u8>>,
    pub(crate) to_value: Vec<Vec<u8>>,
    pub(crate) chain_id: Vec<u64>,
}

#[async_trait::async_trait]
impl Dataset for CodeDiffs {}

type BlockTxTraces = (Option<u32>, Vec<Option<Vec<u8>>>, Vec<ethers::types::BlockTrace>);

#[async_trait::async_trait]
impl CollectByBlock for CodeDiffs {
    type Response = BlockTxTraces;

    async fn extract(request: Params, source: Arc<Source>, query: Arc<Query>) -> R<Self::Response> {
        let schema = query.schemas.get(&Datatype::CodeDiffs).ok_or(err("schema not provided"))?;
        let include_txs = schema.has_column("transaction_hash");
        source.trace_block_state_diffs(request.block_number()? as u32, include_txs).await
    }

    fn transform(response: Self::Response, columns: &mut Self, query: &Arc<Query>) -> R<()> {
        process_code_diffs(&response, columns, &query.schemas)
    }
}

#[async_trait::async_trait]
impl CollectByTransaction for CodeDiffs {
    type Response = BlockTxTraces;

    async fn extract(request: Params, source: Arc<Source>, _: Arc<Query>) -> R<Self::Response> {
        source.trace_transaction_state_diffs(request.transaction_hash()?).await
    }

    fn transform(response: Self::Response, columns: &mut Self, query: &Arc<Query>) -> R<()> {
        process_code_diffs(&response, columns, &query.schemas)
    }
}

pub(crate) fn process_code_diffs(
    response: &BlockTxTraces,
    columns: &mut CodeDiffs,
    schemas: &Schemas,
) -> R<()> {
    let schema = schemas.get(&Datatype::CodeDiffs).ok_or(err("schema not provided"))?;
    let (block_number, txs, traces) = response;
    for (index, (trace, tx)) in traces.iter().zip(txs).enumerate() {
        if let Some(ethers::types::StateDiff(state_diffs)) = &trace.state_diff {
            for (addr, diff) in state_diffs.iter() {
                process_code_diff(addr, &diff.code, block_number, tx, index, columns, schema);
            }
        }
    }
    Ok(())
}

pub(crate) fn process_code_diff(
    addr: &H160,
    diff: &Diff<Bytes>,
    block_number: &Option<u32>,
    transaction_hash: &Option<Vec<u8>>,
    transaction_index: usize,
    columns: &mut CodeDiffs,
    schema: &Table,
) {
    // this code will skip self-destructs and EOAs
    let (from, to) = match diff {
        Diff::Same => return,
        Diff::Born(value) => {
            if value.is_empty() {
                return
            };
            (Vec::new(), value.to_vec())
        }
        Diff::Died(value) => (value.to_vec(), Vec::new()),
        Diff::Changed(ChangedType { from, to }) => (from.to_vec(), to.to_vec()),
    };
    columns.n_rows += 1;
    store!(schema, columns, block_number, *block_number);
    store!(schema, columns, transaction_index, Some(transaction_index as u32));
    store!(schema, columns, transaction_hash, transaction_hash.clone());
    store!(schema, columns, address, addr.as_bytes().to_vec());
    store!(schema, columns, from_value, from);
    store!(schema, columns, to_value, to);
}