pgx 0.7.4

pgx: A Rust framework for creating Postgres extensions
Documentation 
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use crate::pg_sys;
use crate::trigger_support::{PgTriggerError, TriggerEvent};

/// When a trigger happened
///
/// Maps from a `TEXT` of `BEFORE`, `AFTER`, or `INSTEAD OF`.
///
/// Can be calculated from a `pgx_pg_sys::TriggerEvent`.
// Postgres constants: https://cs.github.com/postgres/postgres/blob/36d4efe779bfc7190ea1c1cf8deb0d945b726663/src/include/commands/trigger.h?q=TRIGGER_FIRED_BEFORE#L100-L102
// Postgres defines: https://cs.github.com/postgres/postgres/blob/36d4efe779bfc7190ea1c1cf8deb0d945b726663/src/include/commands/trigger.h?q=TRIGGER_FIRED_BEFORE#L128-L135
pub enum PgTriggerWhen {
    /// `BEFORE`
    Before,
    /// `AFTER`
    After,
    /// `INSTEAD OF`
    InsteadOf,
}

impl TryFrom<TriggerEvent> for PgTriggerWhen {
    type Error = PgTriggerError;
    fn try_from(event: TriggerEvent) -> Result<Self, Self::Error> {
        match event.0 & pg_sys::TRIGGER_EVENT_TIMINGMASK {
            pg_sys::TRIGGER_EVENT_BEFORE => Ok(Self::Before),
            pg_sys::TRIGGER_EVENT_AFTER => Ok(Self::After),
            pg_sys::TRIGGER_EVENT_INSTEAD => Ok(Self::InsteadOf),
            v => Err(PgTriggerError::InvalidPgTriggerWhen(v)),
        }
    }
}

impl ToString for PgTriggerWhen {
    fn to_string(&self) -> String {
        match self {
            PgTriggerWhen::Before => "BEFORE",
            PgTriggerWhen::After => "AFTER",
            PgTriggerWhen::InsteadOf => "INSTEAD OF",
        }
        .to_string()
    }
}