vrl 0.32.0

Vector Remap Language
Documentation 
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use crate::compiler::prelude::*;
use std::{convert::TryInto, net::Ipv4Addr};

fn ip_ntoa(value: Value) -> Resolved {
    let i: u32 = value
        .try_integer()?
        .try_into()
        .map_err(|_| String::from("cannot convert to bytes: integer does not fit in u32"))?;

    Ok(Ipv4Addr::from(i).to_string().into())
}

#[derive(Clone, Copy, Debug)]
pub struct IpNtoa;

impl Function for IpNtoa {
    fn identifier(&self) -> &'static str {
        "ip_ntoa"
    }

    fn usage(&self) -> &'static str {
        indoc! {"
            Converts numeric representation of IPv4 address in network-order bytes
            to numbers-and-dots notation.

            This behavior mimics [inet_ntoa](https://linux.die.net/man/3/inet_ntoa).
        "}
    }

    fn category(&self) -> &'static str {
        Category::Ip.as_ref()
    }

    fn internal_failure_reasons(&self) -> &'static [&'static str] {
        &["`value` cannot fit in an unsigned 32-bit integer."]
    }

    fn return_kind(&self) -> u16 {
        kind::BYTES
    }

    fn parameters(&self) -> &'static [Parameter] {
        const PARAMETERS: &[Parameter] = &[Parameter::required(
            "value",
            kind::INTEGER,
            "The integer representation of an IPv4 address.",
        )];
        PARAMETERS
    }

    fn examples(&self) -> &'static [Example] {
        &[example! {
            title: "Integer to IPv4",
            source: "ip_ntoa!(16909060)",
            result: Ok("1.2.3.4"),
        }]
    }

    fn compile(
        &self,
        _state: &state::TypeState,
        _ctx: &mut FunctionCompileContext,
        arguments: ArgumentList,
    ) -> Compiled {
        let value = arguments.required("value");

        Ok(IpNtoaFn { value }.as_expr())
    }
}

#[derive(Debug, Clone)]
struct IpNtoaFn {
    value: Box<dyn Expression>,
}

impl FunctionExpression for IpNtoaFn {
    fn resolve(&self, ctx: &mut Context) -> Resolved {
        let value = self.value.resolve(ctx)?;
        ip_ntoa(value)
    }

    fn type_def(&self, _: &state::TypeState) -> TypeDef {
        TypeDef::bytes().fallible()
    }
}

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

    test_function![
        ip_ntoa => IpNtoa;

        invalid {
            args: func_args![value: i64::from(u32::MAX) + 1],
            want: Err("cannot convert to bytes: integer does not fit in u32"),
            tdef: TypeDef::bytes().fallible(),
        }

        valid {
            args: func_args![value: 16_909_060],
            want: Ok(value!("1.2.3.4")),
            tdef: TypeDef::bytes().fallible(),
        }
    ];
}