cartel-pg 0.23.0

Async PostgreSQL driver for the dope runtime
Documentation 
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use crate::{
    protocol::frame::Payload,
    reply::{self, server},
};
use o3::buffer::{self, hold};

pub(crate) struct Plan<'input, 'd, R: buffer::Cursor> {
    payload: Payload<'input, 'd, R>,
    class: reply::Class,
    scope: Scope,
}

#[derive(Clone, Copy)]
pub(crate) enum Scope {
    Command,
    Connection,
    Unknown,
}

impl<'input, 'd, R: buffer::Cursor> Plan<'input, 'd, R> {
    pub(crate) fn as_slice(&self) -> &[u8] {
        self.payload.as_slice()
    }

    pub(crate) const fn scope(&self) -> Scope {
        self.scope
    }

    pub(crate) const fn class(&self) -> reply::Class {
        self.class
    }

    pub(crate) fn parse(payload: Payload<'input, 'd, R>) -> Result<Self, crate::Error>
    where
        R: hold::raw::Retain<'d>,
    {
        let fields = server::Fields::try_parse(payload.wire())?;
        Ok(Self {
            payload,
            class: fields.code().class(),
            scope: match fields.severity() {
                "ERROR" => Scope::Command,
                "FATAL" | "PANIC" => Scope::Connection,
                _ => Scope::Unknown,
            },
        })
    }

    pub(crate) fn try_build(
        self,
        policy: hold::Policy,
    ) -> Result<(server::Diagnostic<'d>, reply::Class), hold::Error>
    where
        R: hold::raw::Retain<'d>,
    {
        let Self {
            payload,
            class,
            scope: _,
        } = self;
        let payload = payload.into_inner().bind(policy).try_into()?;
        Ok((server::Diagnostic { payload }, class))
    }
}