transaction: add CSV deserialization
It is unfortunate that both [1] and [2] conspire to make this code way worse than it could otherwise be with a saner (de)serialization format. We both need to introduce `TransactionRecord` due to tagged enums not being powerful enough in CSV, and make its `amount` field optional to deal with the varying number of fields for each kind of transaction. [1]: https://github.com/BurntSushi/rust-csv/issues/211 [2]: https://github.com/BurntSushi/rust-csv/issues/172
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||||||
|
name = "serde_with_macros"
|
||||||
|
version = "2.0.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "de337f322382fcdfbb21a014f7c224ee041a23785651db67b9827403178f698f"
|
||||||
|
dependencies = [
|
||||||
|
"darling",
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "strsim"
|
||||||
|
version = "0.10.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "syn"
|
||||||
|
version = "1.0.99"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "58dbef6ec655055e20b86b15a8cc6d439cca19b667537ac6a1369572d151ab13"
|
||||||
|
dependencies = [
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"unicode-ident",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "time"
|
||||||
|
version = "0.3.13"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "db76ff9fa4b1458b3c7f077f3ff9887394058460d21e634355b273aaf11eea45"
|
||||||
|
dependencies = [
|
||||||
|
"itoa 1.0.3",
|
||||||
|
"libc",
|
||||||
|
"num_threads",
|
||||||
|
"serde",
|
||||||
|
]
|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
name = "unicode-ident"
|
name = "unicode-ident"
|
||||||
version = "1.0.3"
|
version = "1.0.3"
|
||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"
|
checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasm-bindgen"
|
||||||
|
version = "0.2.82"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "fc7652e3f6c4706c8d9cd54832c4a4ccb9b5336e2c3bd154d5cccfbf1c1f5f7d"
|
||||||
|
dependencies = [
|
||||||
|
"cfg-if",
|
||||||
|
"wasm-bindgen-macro",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasm-bindgen-backend"
|
||||||
|
version = "0.2.82"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "662cd44805586bd52971b9586b1df85cdbbd9112e4ef4d8f41559c334dc6ac3f"
|
||||||
|
dependencies = [
|
||||||
|
"bumpalo",
|
||||||
|
"log",
|
||||||
|
"once_cell",
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
"wasm-bindgen-shared",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasm-bindgen-macro"
|
||||||
|
version = "0.2.82"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "b260f13d3012071dfb1512849c033b1925038373aea48ced3012c09df952c602"
|
||||||
|
dependencies = [
|
||||||
|
"quote",
|
||||||
|
"wasm-bindgen-macro-support",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasm-bindgen-macro-support"
|
||||||
|
version = "0.2.82"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5be8e654bdd9b79216c2929ab90721aa82faf65c48cdf08bdc4e7f51357b80da"
|
||||||
|
dependencies = [
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
"wasm-bindgen-backend",
|
||||||
|
"wasm-bindgen-shared",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasm-bindgen-shared"
|
||||||
|
version = "0.2.82"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "6598dd0bd3c7d51095ff6531a5b23e02acdc81804e30d8f07afb77b7215a140a"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||||
|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
"winapi-x86_64-pc-windows-gnu",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-i686-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-x86_64-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||||
|
|
|
||||||
|
|
@ -6,4 +6,7 @@ edition = "2021"
|
||||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||||
|
|
||||||
[dependencies]
|
[dependencies]
|
||||||
|
csv = "1.1"
|
||||||
fpdec = "0.5"
|
fpdec = "0.5"
|
||||||
|
serde = { version = "1.0", features = ["derive"] }
|
||||||
|
serde_with = "2.0"
|
||||||
|
|
|
||||||
19
src/core.rs
19
src/core.rs
|
|
@ -1,16 +1,27 @@
|
||||||
//! Core types used in the processing of payments.
|
//! Core types used in the processing of payments.
|
||||||
|
|
||||||
|
use serde::{Deserialize, Serialize};
|
||||||
|
use serde_with::{serde_as, DisplayFromStr};
|
||||||
|
|
||||||
/// Clients are anonymous, identified by globally unique ids. "16-bit ought to be enough for
|
/// Clients are anonymous, identified by globally unique ids. "16-bit ought to be enough for
|
||||||
/// anyone".
|
/// anyone".
|
||||||
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
#[derive(
|
||||||
|
Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize,
|
||||||
|
)]
|
||||||
|
#[serde(transparent)]
|
||||||
pub struct ClientId(pub u16);
|
pub struct ClientId(pub u16);
|
||||||
|
|
||||||
/// Transactions are identified by a globally unique id. 32 bit is sufficient for our puposes.
|
/// Transactions are identified by a globally unique id. 32 bit is sufficient for our puposes.
|
||||||
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
#[derive(
|
||||||
|
Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize,
|
||||||
|
)]
|
||||||
|
#[serde(transparent)]
|
||||||
pub struct TxId(pub u32);
|
pub struct TxId(pub u32);
|
||||||
|
|
||||||
/// Amounts are represented as exact decimals, up to four places past the decimal.
|
/// Amounts are represented as exact decimals, up to four places past the decimal.
|
||||||
/// For ease of implementation, make use of [fpdec::Decimal] instead of implementing a custom
|
/// For ease of implementation, make use of [fpdec::Decimal] instead of implementing a custom
|
||||||
/// fixed-point number.
|
/// fixed-point number.
|
||||||
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
|
#[serde_as]
|
||||||
pub struct TxAmount(pub fpdec::Decimal);
|
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Deserialize, Serialize)]
|
||||||
|
#[serde(transparent)]
|
||||||
|
pub struct TxAmount(#[serde_as(as = "DisplayFromStr")] pub fpdec::Decimal);
|
||||||
|
|
|
||||||
|
|
@ -1,8 +1,11 @@
|
||||||
//! Define all supported transactions.
|
//! Define all supported transactions.
|
||||||
use crate::core::{ClientId, TxAmount, TxId};
|
use crate::core::{ClientId, TxAmount, TxId};
|
||||||
|
|
||||||
|
use serde::Deserialize;
|
||||||
|
|
||||||
/// A generic [Transaction].
|
/// A generic [Transaction].
|
||||||
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
|
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Deserialize)]
|
||||||
|
#[serde(try_from = "TransactionRecord")]
|
||||||
pub enum Transaction {
|
pub enum Transaction {
|
||||||
Deposit(Deposit),
|
Deposit(Deposit),
|
||||||
Withdrawal(Withdrawal),
|
Withdrawal(Withdrawal),
|
||||||
|
|
@ -11,6 +14,61 @@ pub enum Transaction {
|
||||||
Chargeback(Chargeback),
|
Chargeback(Chargeback),
|
||||||
}
|
}
|
||||||
|
|
||||||
|
impl Transaction {
|
||||||
|
/// Build a [csv::ReaderBuilder] configured to read a CSV formatted [Transaction] stream.
|
||||||
|
pub fn configured_csv_reader_builder() -> csv::ReaderBuilder {
|
||||||
|
let mut builder = csv::ReaderBuilder::new();
|
||||||
|
builder
|
||||||
|
// Expect header input
|
||||||
|
.has_headers(true)
|
||||||
|
// Allow whitespace
|
||||||
|
.trim(csv::Trim::All)
|
||||||
|
// Allow trailing fields to be omitted
|
||||||
|
.flexible(true);
|
||||||
|
builder
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// A type used to deserialize [Transaction] from an input CSV stream.
|
||||||
|
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Deserialize)]
|
||||||
|
struct TransactionRecord<'a> {
|
||||||
|
#[serde(rename = "type")]
|
||||||
|
type_: &'a str,
|
||||||
|
client: ClientId,
|
||||||
|
tx: TxId,
|
||||||
|
amount: Option<TxAmount>,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl TryFrom<TransactionRecord<'_>> for Transaction {
|
||||||
|
// FIXME: use an actual error type.
|
||||||
|
type Error = String;
|
||||||
|
|
||||||
|
fn try_from(value: TransactionRecord<'_>) -> Result<Self, Self::Error> {
|
||||||
|
let TransactionRecord {
|
||||||
|
type_,
|
||||||
|
client,
|
||||||
|
tx,
|
||||||
|
amount,
|
||||||
|
} = value;
|
||||||
|
|
||||||
|
let transaction = match type_ {
|
||||||
|
"deposit" => {
|
||||||
|
let amount = amount.ok_or("Missing amount for transaction")?;
|
||||||
|
Transaction::Deposit(Deposit { client, tx, amount })
|
||||||
|
}
|
||||||
|
"withdrawal" => {
|
||||||
|
let amount = amount.ok_or("Missing amount for transaction")?;
|
||||||
|
Transaction::Withdrawal(Withdrawal { client, tx, amount })
|
||||||
|
}
|
||||||
|
"dispute" => Transaction::Dispute(Dispute { client, tx }),
|
||||||
|
"resolve" => Transaction::Resolve(Resolve { client, tx }),
|
||||||
|
"chargeback" => Transaction::Chargeback(Chargeback { client, tx }),
|
||||||
|
_ => return Err(format!("Unkown transaction type '{}'", type_)),
|
||||||
|
};
|
||||||
|
Ok(transaction)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
/// Deposit funds into an account, i.e: increase its balance by the amount given.
|
/// Deposit funds into an account, i.e: increase its balance by the amount given.
|
||||||
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
|
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
|
||||||
pub struct Deposit {
|
pub struct Deposit {
|
||||||
|
|
@ -55,3 +113,117 @@ pub struct Chargeback {
|
||||||
pub client: ClientId,
|
pub client: ClientId,
|
||||||
pub tx: TxId,
|
pub tx: TxId,
|
||||||
}
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod test {
|
||||||
|
use super::*;
|
||||||
|
use fpdec::{Dec, Decimal};
|
||||||
|
|
||||||
|
fn parse_transaction(input: &str) -> Transaction {
|
||||||
|
let rdr = Transaction::configured_csv_reader_builder().from_reader(input.as_bytes());
|
||||||
|
rdr.into_deserialize().next().unwrap().unwrap()
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_deposit() {
|
||||||
|
let data = "type,client,tx,amount\ndeposit,1,2,3.0";
|
||||||
|
assert_eq!(
|
||||||
|
parse_transaction(data),
|
||||||
|
Transaction::Deposit(Deposit {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
amount: TxAmount(Dec!(3.0))
|
||||||
|
}),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_withdrawal() {
|
||||||
|
let data = "type,client,tx,amount\nwithdrawal,1,2,3.0";
|
||||||
|
assert_eq!(
|
||||||
|
parse_transaction(data),
|
||||||
|
Transaction::Withdrawal(Withdrawal {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
amount: TxAmount(Dec!(3.0))
|
||||||
|
}),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_dispute() {
|
||||||
|
let data = "type,client,tx,amount\ndispute,1,2";
|
||||||
|
assert_eq!(
|
||||||
|
parse_transaction(data),
|
||||||
|
Transaction::Dispute(Dispute {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
}),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_resolve() {
|
||||||
|
let data = "type,client,tx,amount\nresolve,1,2";
|
||||||
|
assert_eq!(
|
||||||
|
parse_transaction(data),
|
||||||
|
Transaction::Resolve(Resolve {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
}),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_chargeback() {
|
||||||
|
let data = "type,client,tx,amount\nchargeback,1,2";
|
||||||
|
assert_eq!(
|
||||||
|
parse_transaction(data),
|
||||||
|
Transaction::Chargeback(Chargeback {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
}),
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn deserialize_transactions() {
|
||||||
|
let data = concat!(
|
||||||
|
"type,client,tx,amount\n",
|
||||||
|
"deposit, 1, 2, 12.0000\n",
|
||||||
|
"withdrawal , 3,4, 42.27 \n",
|
||||||
|
"dispute, 5 , 6, \n",
|
||||||
|
" resolve,7,8,\n",
|
||||||
|
"chargeback,9,10",
|
||||||
|
);
|
||||||
|
let rdr = Transaction::configured_csv_reader_builder().from_reader(data.as_bytes());
|
||||||
|
let transactions: Result<Vec<Transaction>, _> = rdr.into_deserialize().collect();
|
||||||
|
assert_eq!(
|
||||||
|
transactions.unwrap(),
|
||||||
|
vec![
|
||||||
|
Transaction::Deposit(Deposit {
|
||||||
|
client: ClientId(1),
|
||||||
|
tx: TxId(2),
|
||||||
|
amount: TxAmount(Dec!(12.0000)),
|
||||||
|
}),
|
||||||
|
Transaction::Withdrawal(Withdrawal {
|
||||||
|
client: ClientId(3),
|
||||||
|
tx: TxId(4),
|
||||||
|
amount: TxAmount(Dec!(42.27)),
|
||||||
|
}),
|
||||||
|
Transaction::Dispute(Dispute {
|
||||||
|
client: ClientId(5),
|
||||||
|
tx: TxId(6),
|
||||||
|
}),
|
||||||
|
Transaction::Resolve(Resolve {
|
||||||
|
client: ClientId(7),
|
||||||
|
tx: TxId(8),
|
||||||
|
}),
|
||||||
|
Transaction::Chargeback(Chargeback {
|
||||||
|
client: ClientId(9),
|
||||||
|
tx: TxId(10),
|
||||||
|
}),
|
||||||
|
]
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
|
||||||
Loading…
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