I'm encountering a server crash with a panic related to 'Multiplication overflowed' in Rust. Here's the relevant part of the log:
thread 'rw-streaming' panicked at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rust_decimal-1.33.0/src/arithmetic_impls.rs:232:18:
Multiplication overflowed
...
It seems to happen when converting from a Postgres row to a Rust struct. I'm not sure if it's related to handling large decimal numbers or something else. How can I resolve this issue?
bestmike007
Asked on Mar 26, 2024
The panic indicates that there's an overflow when performing a multiplication operation on decimal numbers. This can happen if the numbers involved are too large to be represented within the limits of the rust_decimal
type. To resolve this issue, you can try the following steps:
rust_decimal
can handle.BigInt
or a custom type for arbitrary precision arithmetic.std::panic::catch_unwind
and deal with the overflow case accordingly.rust_decimal
crate itself, consider reporting it to the maintainers or looking for an alternative crate that better suits your needs.Here's an example of how you might handle the overflow in code:
use rust_decimal::Decimal;
use std::panic::{self, AssertUnwindSafe};
fn main() {
let result = panic::catch_unwind(AssertUnwindSafe(|| {
// Your multiplication operation that might overflow
let a = Decimal::new(1, 0);
let b = Decimal::new(1, 0);
a * b
}));
match result {
Ok(value) => println!("Result: {}", value),
Err(_) => println!("Multiplication overflowed"),
}
}
This code attempts to catch the panic caused by an overflow during multiplication and prints an error message instead of crashing the server.