skar-schema 0.1.0

schema utilities for skar
Documentation 
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use std::sync::Arc;

use anyhow::{anyhow, Context, Result};
use arrow2::array::{new_empty_array, Array};
use arrow2::chunk::Chunk;
use arrow2::compute;
use arrow2::datatypes::{DataType, Field, Schema, SchemaRef};

mod util;

pub use util::project_schema;

pub type ArrowChunk = Chunk<Box<dyn Array>>;

fn hash_dt() -> DataType {
    DataType::Binary
}

fn addr_dt() -> DataType {
    DataType::Binary
}

fn quantity_dt() -> DataType {
    DataType::Binary
}

pub fn block_header() -> SchemaRef {
    Schema::from(vec![
        Field::new("number", DataType::UInt64, false),
        Field::new("hash", hash_dt(), false),
        Field::new("parent_hash", hash_dt(), false),
        Field::new("nonce", DataType::Binary, true),
        Field::new("sha3_uncles", hash_dt(), false),
        Field::new("logs_bloom", DataType::Binary, false),
        Field::new("transactions_root", hash_dt(), false),
        Field::new("state_root", hash_dt(), false),
        Field::new("receipts_root", hash_dt(), false),
        Field::new("miner", addr_dt(), false),
        Field::new("difficulty", quantity_dt(), true),
        Field::new("total_difficulty", quantity_dt(), true),
        Field::new("extra_data", DataType::Binary, false),
        Field::new("size", quantity_dt(), false),
        Field::new("gas_limit", quantity_dt(), false),
        Field::new("gas_used", quantity_dt(), false),
        Field::new("timestamp", quantity_dt(), false),
        Field::new("uncles", DataType::Binary, true),
        Field::new("base_fee_per_gas", quantity_dt(), true),
    ])
    .into()
}

pub fn transaction() -> SchemaRef {
    Schema::from(vec![
        Field::new("block_hash", hash_dt(), false),
        Field::new("block_number", DataType::UInt64, false),
        Field::new("from", addr_dt(), true),
        Field::new("gas", quantity_dt(), false),
        Field::new("gas_price", quantity_dt(), true),
        Field::new("hash", hash_dt(), false),
        Field::new("input", DataType::Binary, false),
        Field::new("nonce", quantity_dt(), false),
        Field::new("to", addr_dt(), true),
        Field::new("transaction_index", DataType::UInt64, false),
        Field::new("value", quantity_dt(), false),
        Field::new("v", quantity_dt(), true),
        Field::new("r", quantity_dt(), true),
        Field::new("s", quantity_dt(), true),
        Field::new("max_priority_fee_per_gas", quantity_dt(), true),
        Field::new("max_fee_per_gas", quantity_dt(), true),
        Field::new("chain_id", quantity_dt(), true),
        Field::new("cumulative_gas_used", quantity_dt(), false),
        Field::new("effective_gas_price", quantity_dt(), false),
        Field::new("gas_used", quantity_dt(), false),
        Field::new("contract_address", addr_dt(), true),
        Field::new("logs_bloom", DataType::Binary, false),
        Field::new("type", DataType::UInt8, true),
        Field::new("root", hash_dt(), true),
        Field::new("status", DataType::UInt8, true),
        Field::new("sighash", DataType::Binary, true),
    ])
    .into()
}

pub fn log() -> SchemaRef {
    Schema::from(vec![
        Field::new("removed", DataType::Boolean, true),
        Field::new("log_index", DataType::UInt64, false),
        Field::new("transaction_index", DataType::UInt64, false),
        Field::new("transaction_hash", hash_dt(), false),
        Field::new("block_hash", hash_dt(), false),
        Field::new("block_number", DataType::UInt64, false),
        Field::new("address", addr_dt(), false),
        Field::new("data", DataType::Binary, false),
        Field::new("topic0", DataType::Binary, true),
        Field::new("topic1", DataType::Binary, true),
        Field::new("topic2", DataType::Binary, true),
        Field::new("topic3", DataType::Binary, true),
    ])
    .into()
}

pub fn concat_chunks(chunks: &[Arc<ArrowChunk>]) -> Result<ArrowChunk> {
    if chunks.is_empty() {
        return Err(anyhow!("can't concat 0 chunks"));
    }

    let num_cols = chunks[0].columns().len();

    let cols = (0..num_cols)
        .map(|col| {
            let arrs = chunks
                .iter()
                .map(|chunk| {
                    chunk
                        .columns()
                        .get(col)
                        .map(|col| col.as_ref())
                        .context("get column")
                })
                .collect::<Result<Vec<_>>>()?;
            compute::concatenate::concatenate(&arrs).context("concat arrays")
        })
        .collect::<Result<Vec<_>>>()?;

    Ok(ArrowChunk::new(cols))
}

pub fn empty_chunk(schema: &Schema) -> ArrowChunk {
    let mut cols = Vec::new();
    for field in schema.fields.iter() {
        cols.push(new_empty_array(field.data_type().clone()));
    }
    ArrowChunk::new(cols)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn smoke_test_schema_constructors() {
        block_header();
        transaction();
        log();
    }
}