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Copy pathvalue.rs
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139 lines (116 loc) 路 3.33 KB
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use crate::error::{BoxDynError, UnexpectedNullError};
use crate::postgres::{PgTypeInfo, Postgres};
use crate::value::{Value, ValueRef};
use bytes::{Buf, Bytes};
use std::borrow::Cow;
use std::str::from_utf8;
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
#[repr(u8)]
pub enum PgValueFormat {
Text = 0,
Binary = 1,
}
/// Implementation of [`ValueRef`] for PostgreSQL.
#[derive(Clone)]
pub struct PgValueRef<'r> {
pub(crate) value: Option<&'r [u8]>,
pub(crate) row: Option<&'r Bytes>,
pub(crate) type_info: PgTypeInfo,
pub(crate) format: PgValueFormat,
}
/// Implementation of [`Value`] for PostgreSQL.
#[derive(Clone)]
pub struct PgValue {
pub(crate) value: Option<Bytes>,
pub(crate) type_info: PgTypeInfo,
pub(crate) format: PgValueFormat,
}
impl<'r> PgValueRef<'r> {
pub(crate) fn get(buf: &mut &'r [u8], format: PgValueFormat, ty: PgTypeInfo) -> Self {
let mut element_len = buf.get_i32();
let element_val = if element_len == -1 {
element_len = 0;
None
} else {
Some(&buf[..(element_len as usize)])
};
buf.advance(element_len as usize);
PgValueRef {
value: element_val,
row: None,
type_info: ty,
format,
}
}
pub(crate) fn format(&self) -> PgValueFormat {
self.format
}
pub(crate) fn as_bytes(&self) -> Result<&'r [u8], BoxDynError> {
match &self.value {
Some(v) => Ok(v),
None => Err(UnexpectedNullError.into()),
}
}
pub(crate) fn as_str(&self) -> Result<&'r str, BoxDynError> {
Ok(from_utf8(self.as_bytes()?)?)
}
}
impl Value for PgValue {
type Database = Postgres;
#[inline]
fn as_ref(&self) -> PgValueRef<'_> {
PgValueRef {
value: self.value.as_deref(),
row: None,
type_info: self.type_info.clone(),
format: self.format,
}
}
fn type_info(&self) -> Cow<'_, PgTypeInfo> {
Cow::Borrowed(&self.type_info)
}
fn is_null(&self) -> bool {
self.value.is_none()
}
}
impl<'r> ValueRef<'r> for PgValueRef<'r> {
type Database = Postgres;
fn to_owned(&self) -> PgValue {
let value = match (self.row, self.value) {
(Some(row), Some(value)) => Some(row.slice_ref(value)),
(None, Some(value)) => Some(Bytes::copy_from_slice(value)),
_ => None,
};
PgValue {
value,
format: self.format,
type_info: self.type_info.clone(),
}
}
fn type_info(&self) -> Cow<'_, PgTypeInfo> {
Cow::Borrowed(&self.type_info)
}
fn is_null(&self) -> bool {
self.value.is_none()
}
}
#[cfg(feature = "any")]
impl<'r> From<PgValueRef<'r>> for crate::any::AnyValueRef<'r> {
#[inline]
fn from(value: PgValueRef<'r>) -> Self {
crate::any::AnyValueRef {
type_info: value.type_info.clone().into(),
kind: crate::any::value::AnyValueRefKind::Postgres(value),
}
}
}
#[cfg(feature = "any")]
impl From<PgValue> for crate::any::AnyValue {
#[inline]
fn from(value: PgValue) -> Self {
crate::any::AnyValue {
type_info: value.type_info.clone().into(),
kind: crate::any::value::AnyValueKind::Postgres(value),
}
}
}