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Lewis Diamond 2021-03-14 16:08:26 -04:00
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/target

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[package]
name = "act"
version = "0.1.0"
authors = ["Lewis Diamond <git@lewisdiamond.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
serde = { version = "1.0", features = ["derive"] }
strum = { version = "0.20.0", features = ["derive"] }
tokio = { version = "1", features = ["full"] }
tokio-stream = "0.1"
async-stream = "0.3"
csv = "1.1.5"
strum_macros = "0.20.1"
[dev-dependencies]
tokio-test = "0.4.0"

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edition = "2018"

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src/lib.rs Normal file
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pub mod types;
use async_stream::stream;
use std::io::Read;
use tokio_stream::Stream;
use types::Transaction;
pub fn parse<R: Read>(input: R) -> impl Stream<Item = Transaction> {
let mut reader = csv::ReaderBuilder::new()
.trim(csv::Trim::All)
.has_headers(true)
.from_reader(input);
stream! {
for tx in reader.deserialize() {
match tx {
Ok(tx) => yield tx,
//Depending on the infrastructure, a specific output format
//might be used to add monitoring/alerting
Err(e) => eprintln!("Error reading CSV: {}", e),
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use tokio_stream::StreamExt;
use tokio_test::block_on;
use types::Transaction;
use types::TransactionType;
#[test]
fn valid_csv_is_parsed() {
block_on(async {
let data = "\
type,client,tx,amount
deposit,1,1,1.0
deposit,2,2,2.0
deposit,1,3,2.0
withdrawal,1,4,1.5
withdrawal,2,5,3.0";
let expected = vec![Transaction {tx_type: TransactionType::Deposit, amount: 10000, client: 1, tx: 1}];
let txs = parse(data.as_bytes()).collect::<Vec<Transaction>>().await;
assert_eq!(expected, txs);
});
}
#[test]
fn valid_csv_with_whitespaces_is_parsed() {
block_on(async {
let data = "\
type, client, tx, amount
deposit, 1, 1, 1.0
deposit, 2, 2, 2.0
deposit, 1, 3, 2.0
withdrawal, 1, 4, 1.5
withdrawal, 2, 5, 3.0";
let txs = parse(data.as_bytes());
let result: Vec<Transaction> = txs.collect::<Vec<Transaction>>().await;
result.iter().for_each(|t| eprintln!("{:?}", t));
});
}
}

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src/types/mod.rs Normal file
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use serde::{Deserialize, Deserializer};
use serde::de;
#[derive(Eq, PartialEq, Debug, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum TransactionType {
Deposit,
Withdrawal,
}
#[derive(Debug, Deserialize, PartialEq)]
pub struct Transaction {
#[serde(rename = "type")]
pub tx_type: TransactionType,
pub client: usize,
pub tx: usize,
/// Amount of the smallest unit, e.g. 0.0001 as per the specification
#[serde(deserialize_with = "de_amount")]
pub amount: usize,
}
fn de_amount<'de, D>(deserializer: D) -> Result<usize, D::Error> where D: Deserializer<'de> {
//TODO validate for input such as `.100` so it doesn't give 100
let deserialized = String::deserialize(deserializer)?;
let mut splitted = deserialized.split('.');
let mut ret: usize = 0;
let mut factor = 4;
while let Some(s) = splitted.next() {
ret += s.parse::<usize>().map_err(de::Error::custom)? * 10usize.pow(factor);
if factor < 1 { break;}
factor -= 4;
};
Ok(ret)
}