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split derives into different files

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freax13 2020-01-30 12:59:09 +01:00 committed by Ryan Leckey
parent 9c96bc92ee
commit e603f5fcf6
6 changed files with 884 additions and 846 deletions
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846
sqlx-macros/src/derives.rs
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@ -1,846 +0,0 @@
use proc_macro2::Ident;
use quote::quote;
use std::iter::FromIterator;
use syn::punctuated::Punctuated;
use syn::token::Comma;
use syn::{
parse_quote, Arm, Attribute, Block, Data, DataEnum, DataStruct, DeriveInput, Expr, Field,
Fields, FieldsNamed, FieldsUnnamed, Lit, Meta, MetaNameValue, NestedMeta, Stmt, Variant,
};
macro_rules! assert_attribute {
($e:expr, $err:expr, $input:expr) => {
if !$e {
return Err(syn::Error::new_spanned($input, $err));
}
};
}
struct SqlxAttributes {
transparent: bool,
postgres_oid: Option<u32>,
repr: Option<Ident>,
rename: Option<String>,
}
fn parse_attributes(input: &[Attribute]) -> syn::Result<SqlxAttributes> {
let mut transparent = None;
let mut postgres_oid = None;
let mut repr = None;
let mut rename = None;
macro_rules! fail {
($t:expr, $m:expr) => {
return Err(syn::Error::new_spanned($t, $m));
};
}
macro_rules! try_set {
($i:ident, $v:expr, $t:expr) => {
match $i {
None => $i = Some($v),
Some(_) => fail!($t, "duplicate attribute"),
}
};
}
for attr in input {
let meta = attr
.parse_meta()
.map_err(|e| syn::Error::new_spanned(attr, e))?;
match meta {
Meta::List(list) if list.path.is_ident("sqlx") => {
for value in list.nested.iter() {
match value {
NestedMeta::Meta(meta) => match meta {
Meta::Path(p) if p.is_ident("transparent") => {
try_set!(transparent, true, value)
}
Meta::NameValue(MetaNameValue {
path,
lit: Lit::Str(val),
..
}) if path.is_ident("rename") => try_set!(rename, val.value(), value),
Meta::List(list) if list.path.is_ident("postgres") => {
for value in list.nested.iter() {
match value {
NestedMeta::Meta(Meta::NameValue(MetaNameValue {
path,
lit: Lit::Int(val),
..
})) if path.is_ident("oid") => {
try_set!(postgres_oid, val.base10_parse()?, value);
}
u => fail!(u, "unexpected value"),
}
}
}
u => fail!(u, "unexpected attribute"),
},
u => fail!(u, "unexpected attribute"),
}
}
}
Meta::List(list) if list.path.is_ident("repr") => {
if list.nested.len() != 1 {
fail!(&list.nested, "expected one value")
}
match list.nested.first().unwrap() {
NestedMeta::Meta(Meta::Path(p)) if p.get_ident().is_some() => {
try_set!(repr, p.get_ident().unwrap().clone(), list);
}
u => fail!(u, "unexpected value"),
}
}
_ => {}
}
}
Ok(SqlxAttributes {
transparent: transparent.unwrap_or(false),
postgres_oid,
repr,
rename,
})
}
fn check_transparent_attributes(input: &DeriveInput, field: &Field) -> syn::Result<()> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
attributes.transparent,
"expected #[sqlx(transparent)]",
input
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
let attributes = parse_attributes(&field.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
field
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
field
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", field);
Ok(())
}
fn check_enum_attributes<'a>(
input: &'a DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
input
);
for variant in variants {
let attributes = parse_attributes(&variant.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
variant
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
variant
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", variant);
}
Ok(attributes)
}
fn check_weak_enum_attributes(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<Ident> {
let attributes = check_enum_attributes(input, variants)?;
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(attributes.repr.is_some(), "expected #[repr(..)]", input);
for variant in variants {
let attributes = parse_attributes(&variant.attrs)?;
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
variant
);
}
Ok(attributes.repr.unwrap())
}
fn check_strong_enum_attributes(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = check_enum_attributes(input, variants)?;
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_some(),
"expected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
Ok(attributes)
}
fn check_struct_attributes<'a>(
input: &'a DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
input
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_some(),
"expected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
input
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
for field in fields {
let attributes = parse_attributes(&field.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
field
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
field
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", field);
}
Ok(attributes)
}
pub(crate) fn expand_derive_encode(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let args = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_encode_transparent(&input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match args.repr {
Some(_) => expand_derive_encode_weak_enum(input, variants),
None => expand_derive_encode_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_encode_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_encode_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
generics.params.insert(0, parse_quote!(DB: sqlx::Database));
generics
.make_where_clause()
.predicates
.push(parse_quote!(#ty: sqlx::encode::Encode<DB>));
let (impl_generics, _, where_clause) = generics.split_for_impl();
Ok(quote!(
impl #impl_generics sqlx::encode::Encode<DB> for #ident #ty_generics #where_clause {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
sqlx::encode::Encode::encode(&self.0, buf)
}
fn encode_nullable(&self, buf: &mut std::vec::Vec<u8>) -> sqlx::encode::IsNull {
sqlx::encode::Encode::encode_nullable(&self.0, buf)
}
fn size_hint(&self) -> usize {
sqlx::encode::Encode::size_hint(&self.0)
}
}
))
}
fn expand_derive_encode_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, &variants)?;
let ident = &input.ident;
Ok(quote!(
impl<DB: sqlx::Database> sqlx::encode::Encode<DB> for #ident where #repr: sqlx::encode::Encode<DB> {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
sqlx::encode::Encode::encode(&(*self as #repr), buf)
}
fn encode_nullable(&self, buf: &mut std::vec::Vec<u8>) -> sqlx::encode::IsNull {
sqlx::encode::Encode::encode_nullable(&(*self as #repr), buf)
}
fn size_hint(&self) -> usize {
sqlx::encode::Encode::size_hint(&(*self as #repr))
}
}
))
}
fn expand_derive_encode_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_strong_enum_attributes(input, &variants)?;
let ident = &input.ident;
let mut value_arms = Vec::new();
for v in variants {
let id = &v.ident;
let attributes = parse_attributes(&v.attrs)?;
if let Some(rename) = attributes.rename {
value_arms.push(quote!(#ident :: #id => #rename,));
} else {
let name = id.to_string();
value_arms.push(quote!(#ident :: #id => #name,));
}
}
Ok(quote!(
impl<DB: sqlx::Database> sqlx::encode::Encode<DB> for #ident where str: sqlx::encode::Encode<DB> {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
let val = match self {
#(#value_arms)*
};
<str as sqlx::encode::Encode<DB>>::encode(val, buf)
}
fn size_hint(&self) -> usize {
let val = match self {
#(#value_arms)*
};
<str as sqlx::encode::Encode<DB>>::size_hint(val)
}
}
))
}
fn expand_derive_encode_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_struct_attributes(input, &fields)?;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let ident = &input.ident;
let column_count = fields.len();
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
let predicates = &mut generics.make_where_clause().predicates;
for field in fields {
let ty = &field.ty;
predicates.push(parse_quote!(#ty: sqlx::encode::Encode<sqlx::Postgres>));
predicates.push(parse_quote!(sqlx::Postgres: sqlx::types::HasSqlType<#ty>));
}
let (impl_generics, _, where_clause) = generics.split_for_impl();
let mut writes: Vec<Block> = Vec::new();
for field in fields {
let id = &field.ident;
let ty = &field.ty;
writes.push(parse_quote!({
// write oid
let info = <sqlx::Postgres as sqlx::types::HasSqlType<#ty>>::type_info();
buf.extend(&info.oid().to_be_bytes());
// write zeros for length
buf.extend(&[0; 4]);
let start = buf.len();
sqlx::encode::Encode::<sqlx::Postgres>::encode(&self. #id, buf);
let end = buf.len();
let size = end - start;
// replaces zeros with actual length
buf[start-4..start].copy_from_slice(&(size as u32).to_be_bytes());
}));
}
let mut sizes: Vec<Expr> = Vec::new();
for field in fields {
let id = &field.ident;
let ty = &field.ty;
sizes.push(
parse_quote!(<#ty as sqlx::encode::Encode<sqlx::Postgres>>::size_hint(&self. #id)),
);
}
tts.extend(quote!(
impl #impl_generics sqlx::encode::Encode<sqlx::Postgres> for #ident #ty_generics #where_clause {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
buf.extend(&(#column_count as u32).to_be_bytes());
#(#writes)*
}
fn size_hint(&self) -> usize {
4 + #column_count * (4 + 4) + #(#sizes)+*
}
}
));
}
Ok(tts)
}
pub(crate) fn expand_derive_decode(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let attrs = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_decode_transparent(input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match attrs.repr {
Some(_) => expand_derive_decode_weak_enum(input, variants),
None => expand_derive_decode_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_decode_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_decode_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
generics.params.insert(0, parse_quote!(DB: sqlx::Database));
generics
.make_where_clause()
.predicates
.push(parse_quote!(#ty: sqlx::decode::Decode<DB>));
let (impl_generics, _, where_clause) = generics.split_for_impl();
Ok(quote!(
impl #impl_generics sqlx::decode::Decode<DB> for #ident #ty_generics #where_clause {
fn decode(raw: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode(raw).map(Self)
}
fn decode_null() -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode_null().map(Self)
}
fn decode_nullable(raw: std::option::Option<&[u8]>) -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode_nullable(raw).map(Self)
}
}
))
}
fn expand_derive_decode_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, &variants)?;
let ident = &input.ident;
let arms = variants
.iter()
.map(|v| {
let id = &v.ident;
parse_quote!(_ if (#ident :: #id as #repr) == val => Ok(#ident :: #id),)
})
.collect::<Vec<Arm>>();
Ok(quote!(
impl<DB: sqlx::Database> sqlx::decode::Decode<DB> for #ident where #repr: sqlx::decode::Decode<DB> {
fn decode(raw: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
let val = <#repr as sqlx::decode::Decode<DB>>::decode(raw)?;
match val {
#(#arms)*
_ => Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid value")))
}
}
}
))
}
fn expand_derive_decode_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_strong_enum_attributes(input, &variants)?;
let ident = &input.ident;
let mut value_arms = Vec::new();
for v in variants {
let id = &v.ident;
let attributes = parse_attributes(&v.attrs)?;
if let Some(rename) = attributes.rename {
value_arms.push(quote!(#rename => Ok(#ident :: #id),));
} else {
let name = id.to_string();
value_arms.push(quote!(#name => Ok(#ident :: #id),));
}
}
// TODO: prevent heap allocation
Ok(quote!(
impl<DB: sqlx::Database> sqlx::decode::Decode<DB> for #ident where std::string::String: sqlx::decode::Decode<DB> {
fn decode(buf: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
let val = <String as sqlx::decode::Decode<DB>>::decode(buf)?;
match val.as_str() {
#(#value_arms)*
_ => Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid value")))
}
}
}
))
}
fn expand_derive_decode_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_struct_attributes(input, fields)?;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let ident = &input.ident;
let column_count = fields.len();
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
let predicates = &mut generics.make_where_clause().predicates;
for field in fields {
let ty = &field.ty;
predicates.push(parse_quote!(#ty: sqlx::decode::Decode<sqlx::Postgres>));
predicates.push(parse_quote!(sqlx::Postgres: sqlx::types::HasSqlType<#ty>));
}
let (impl_generics, _, where_clause) = generics.split_for_impl();
let mut reads: Vec<Vec<Stmt>> = Vec::new();
let mut names: Vec<Ident> = Vec::new();
for field in fields {
let id = &field.ident;
names.push(id.clone().unwrap());
let ty = &field.ty;
reads.push(parse_quote!(
if buf.len() < 8 {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let oid = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[0..4]).unwrap());
if oid != <sqlx::Postgres as sqlx::types::HasSqlType<#ty>>::type_info().oid() {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid oid")));
}
let len = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[4..8]).unwrap()) as usize;
if buf.len() < 8 + len {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let raw = &buf[8..8+len];
let #id = <#ty as sqlx::decode::Decode<sqlx::Postgres>>::decode(raw)?;
let buf = &buf[8+len..];
));
}
let reads = reads.into_iter().flatten();
tts.extend(quote!(
impl #impl_generics sqlx::decode::Decode<sqlx::Postgres> for #ident#ty_generics #where_clause {
fn decode(buf: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
if buf.len() < 4 {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let column_count = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[..4]).unwrap()) as usize;
if column_count != #column_count {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid column count")));
}
let buf = &buf[4..];
#(#reads)*
if !buf.is_empty() {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new(format!("Too much data sent ({} bytes left)", buf.len()))));
}
Ok(#ident {
#(#names),*
})
}
}
))
}
Ok(tts)
}
pub(crate) fn expand_derive_has_sql_type(
input: &DeriveInput,
) -> syn::Result<proc_macro2::TokenStream> {
let attrs = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_has_sql_type_transparent(input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match attrs.repr {
Some(_) => expand_derive_has_sql_type_weak_enum(input, variants),
None => expand_derive_has_sql_type_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_has_sql_type_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_has_sql_type_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (impl_generics, ty_generics, _) = generics.split_for_impl();
// add db type for clause
let mut generics = generics.clone();
generics
.make_where_clause()
.predicates
.push(parse_quote!(Self: sqlx::types::HasSqlType<#ty>));
let (_, _, where_clause) = generics.split_for_impl();
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl #impl_generics sqlx::types::HasSqlType< #ident #ty_generics > for sqlx::MySql #where_clause {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#ty>>::type_info()
}
}
));
}
if cfg!(feature = "postgres") {
tts.extend(quote!(
impl #impl_generics sqlx::types::HasSqlType< #ident #ty_generics > for sqlx::Postgres #where_clause {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#ty>>::type_info()
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, variants)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::MySql where Self: sqlx::types::HasSqlType< #repr > {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#repr>>::type_info()
}
}
));
}
if cfg!(feature = "postgres") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres where Self: sqlx::types::HasSqlType< #repr > {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#repr>>::type_info()
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let attributes = check_strong_enum_attributes(input, variants)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::MySql {
fn type_info() -> Self::TypeInfo {
sqlx::mysql::MySqlTypeInfo::r#enum()
}
}
));
}
if cfg!(feature = "postgres") {
let oid = attributes.postgres_oid.unwrap();
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres {
fn type_info() -> Self::TypeInfo {
sqlx::postgres::PgTypeInfo::with_oid(#oid)
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let attributes = check_struct_attributes(input, fields)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let oid = attributes.postgres_oid.unwrap();
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres {
fn type_info() -> Self::TypeInfo {
sqlx::postgres::PgTypeInfo::with_oid(#oid)
}
}
));
}
Ok(tts)
}
pub(crate) fn expand_derive_type(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let encode_tts = expand_derive_encode(input)?;
let decode_tts = expand_derive_decode(input)?;
let has_sql_type_tts = expand_derive_has_sql_type(input)?;
let combined = proc_macro2::TokenStream::from_iter(
encode_tts
.into_iter()
.chain(decode_tts)
.chain(has_sql_type_tts),
);
Ok(combined)
}

261
sqlx-macros/src/derives/attributes.rs Normal file
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@ -0,0 +1,261 @@
use proc_macro2::Ident;
use syn::punctuated::Punctuated;
use syn::token::Comma;
use syn::{Attribute, DeriveInput, Field, Lit, Meta, MetaNameValue, NestedMeta, Variant};
macro_rules! assert_attribute {
($e:expr, $err:expr, $input:expr) => {
if !$e {
return Err(syn::Error::new_spanned($input, $err));
}
};
}
pub struct SqlxAttributes {
pub transparent: bool,
pub postgres_oid: Option<u32>,
pub repr: Option<Ident>,
pub rename: Option<String>,
}
pub fn parse_attributes(input: &[Attribute]) -> syn::Result<SqlxAttributes> {
let mut transparent = None;
let mut postgres_oid = None;
let mut repr = None;
let mut rename = None;
macro_rules! fail {
($t:expr, $m:expr) => {
return Err(syn::Error::new_spanned($t, $m));
};
}
macro_rules! try_set {
($i:ident, $v:expr, $t:expr) => {
match $i {
None => $i = Some($v),
Some(_) => fail!($t, "duplicate attribute"),
}
};
}
for attr in input {
let meta = attr
.parse_meta()
.map_err(|e| syn::Error::new_spanned(attr, e))?;
match meta {
Meta::List(list) if list.path.is_ident("sqlx") => {
for value in list.nested.iter() {
match value {
NestedMeta::Meta(meta) => match meta {
Meta::Path(p) if p.is_ident("transparent") => {
try_set!(transparent, true, value)
}
Meta::NameValue(MetaNameValue {
path,
lit: Lit::Str(val),
..
}) if path.is_ident("rename") => try_set!(rename, val.value(), value),
Meta::List(list) if list.path.is_ident("postgres") => {
for value in list.nested.iter() {
match value {
NestedMeta::Meta(Meta::NameValue(MetaNameValue {
path,
lit: Lit::Int(val),
..
})) if path.is_ident("oid") => {
try_set!(postgres_oid, val.base10_parse()?, value);
}
u => fail!(u, "unexpected value"),
}
}
}
u => fail!(u, "unexpected attribute"),
},
u => fail!(u, "unexpected attribute"),
}
}
}
Meta::List(list) if list.path.is_ident("repr") => {
if list.nested.len() != 1 {
fail!(&list.nested, "expected one value")
}
match list.nested.first().unwrap() {
NestedMeta::Meta(Meta::Path(p)) if p.get_ident().is_some() => {
try_set!(repr, p.get_ident().unwrap().clone(), list);
}
u => fail!(u, "unexpected value"),
}
}
_ => {}
}
}
Ok(SqlxAttributes {
transparent: transparent.unwrap_or(false),
postgres_oid,
repr,
rename,
})
}
pub fn check_transparent_attributes(input: &DeriveInput, field: &Field) -> syn::Result<()> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
attributes.transparent,
"expected #[sqlx(transparent)]",
input
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
let attributes = parse_attributes(&field.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
field
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
field
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", field);
Ok(())
}
pub fn check_enum_attributes<'a>(
input: &'a DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
input
);
for variant in variants {
let attributes = parse_attributes(&variant.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
variant
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
variant
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", variant);
}
Ok(attributes)
}
pub fn check_weak_enum_attributes(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<Ident> {
let attributes = check_enum_attributes(input, variants)?;
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(attributes.repr.is_some(), "expected #[repr(..)]", input);
for variant in variants {
let attributes = parse_attributes(&variant.attrs)?;
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
variant
);
}
Ok(attributes.repr.unwrap())
}
pub fn check_strong_enum_attributes(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = check_enum_attributes(input, variants)?;
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_some(),
"expected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
Ok(attributes)
}
pub fn check_struct_attributes<'a>(
input: &'a DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<SqlxAttributes> {
let attributes = parse_attributes(&input.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
input
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_some(),
"expected #[sqlx(postgres(oid = ..))]",
input
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
input
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
for field in fields {
let attributes = parse_attributes(&field.attrs)?;
assert_attribute!(
!attributes.transparent,
"unexpected #[sqlx(transparent)]",
field
);
#[cfg(feature = "postgres")]
assert_attribute!(
attributes.postgres_oid.is_none(),
"unexpected #[sqlx(postgres(oid = ..))]",
field
);
assert_attribute!(
attributes.rename.is_none(),
"unexpected #[sqlx(rename = ..)]",
field
);
assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", field);
}
Ok(attributes)
}

221
sqlx-macros/src/derives/decode.rs Normal file
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@ -0,0 +1,221 @@
use super::attributes::{
check_strong_enum_attributes, check_struct_attributes, check_transparent_attributes,
check_weak_enum_attributes, parse_attributes,
};
use proc_macro2::Ident;
use quote::quote;
use syn::punctuated::Punctuated;
use syn::token::Comma;
use syn::{
parse_quote, Arm, Data, DataEnum, DataStruct, DeriveInput, Field, Fields, FieldsNamed,
FieldsUnnamed, Stmt, Variant,
};
pub fn expand_derive_decode(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let attrs = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_decode_transparent(input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match attrs.repr {
Some(_) => expand_derive_decode_weak_enum(input, variants),
None => expand_derive_decode_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_decode_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_decode_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
generics.params.insert(0, parse_quote!(DB: sqlx::Database));
generics
.make_where_clause()
.predicates
.push(parse_quote!(#ty: sqlx::decode::Decode<DB>));
let (impl_generics, _, where_clause) = generics.split_for_impl();
Ok(quote!(
impl #impl_generics sqlx::decode::Decode<DB> for #ident #ty_generics #where_clause {
fn decode(raw: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode(raw).map(Self)
}
fn decode_null() -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode_null().map(Self)
}
fn decode_nullable(raw: std::option::Option<&[u8]>) -> std::result::Result<Self, sqlx::decode::DecodeError> {
<#ty as sqlx::decode::Decode<DB>>::decode_nullable(raw).map(Self)
}
}
))
}
fn expand_derive_decode_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, &variants)?;
let ident = &input.ident;
let arms = variants
.iter()
.map(|v| {
let id = &v.ident;
parse_quote!(_ if (#ident :: #id as #repr) == val => Ok(#ident :: #id),)
})
.collect::<Vec<Arm>>();
Ok(quote!(
impl<DB: sqlx::Database> sqlx::decode::Decode<DB> for #ident where #repr: sqlx::decode::Decode<DB> {
fn decode(raw: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
let val = <#repr as sqlx::decode::Decode<DB>>::decode(raw)?;
match val {
#(#arms)*
_ => Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid value")))
}
}
}
))
}
fn expand_derive_decode_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_strong_enum_attributes(input, &variants)?;
let ident = &input.ident;
let mut value_arms = Vec::new();
for v in variants {
let id = &v.ident;
let attributes = parse_attributes(&v.attrs)?;
if let Some(rename) = attributes.rename {
value_arms.push(quote!(#rename => Ok(#ident :: #id),));
} else {
let name = id.to_string();
value_arms.push(quote!(#name => Ok(#ident :: #id),));
}
}
// TODO: prevent heap allocation
Ok(quote!(
impl<DB: sqlx::Database> sqlx::decode::Decode<DB> for #ident where std::string::String: sqlx::decode::Decode<DB> {
fn decode(buf: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
let val = <String as sqlx::decode::Decode<DB>>::decode(buf)?;
match val.as_str() {
#(#value_arms)*
_ => Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid value")))
}
}
}
))
}
fn expand_derive_decode_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_struct_attributes(input, fields)?;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let ident = &input.ident;
let column_count = fields.len();
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
let predicates = &mut generics.make_where_clause().predicates;
for field in fields {
let ty = &field.ty;
predicates.push(parse_quote!(#ty: sqlx::decode::Decode<sqlx::Postgres>));
predicates.push(parse_quote!(sqlx::Postgres: sqlx::types::HasSqlType<#ty>));
}
let (impl_generics, _, where_clause) = generics.split_for_impl();
let mut reads: Vec<Vec<Stmt>> = Vec::new();
let mut names: Vec<Ident> = Vec::new();
for field in fields {
let id = &field.ident;
names.push(id.clone().unwrap());
let ty = &field.ty;
reads.push(parse_quote!(
if buf.len() < 8 {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let oid = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[0..4]).unwrap());
if oid != <sqlx::Postgres as sqlx::types::HasSqlType<#ty>>::type_info().oid() {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid oid")));
}
let len = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[4..8]).unwrap()) as usize;
if buf.len() < 8 + len {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let raw = &buf[8..8+len];
let #id = <#ty as sqlx::decode::Decode<sqlx::Postgres>>::decode(raw)?;
let buf = &buf[8+len..];
));
}
let reads = reads.into_iter().flatten();
tts.extend(quote!(
impl #impl_generics sqlx::decode::Decode<sqlx::Postgres> for #ident#ty_generics #where_clause {
fn decode(buf: &[u8]) -> std::result::Result<Self, sqlx::decode::DecodeError> {
if buf.len() < 4 {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Not enough data sent")));
}
let column_count = u32::from_be_bytes(std::convert::TryInto::try_into(&buf[..4]).unwrap()) as usize;
if column_count != #column_count {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new("Invalid column count")));
}
let buf = &buf[4..];
#(#reads)*
if !buf.is_empty() {
return Err(sqlx::decode::DecodeError::Message(std::boxed::Box::new(format!("Too much data sent ({} bytes left)", buf.len()))));
}
Ok(#ident {
#(#names),*
})
}
}
))
}
Ok(tts)
}

208
sqlx-macros/src/derives/encode.rs Normal file
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@ -0,0 +1,208 @@
use super::attributes::{
check_strong_enum_attributes, check_struct_attributes, check_transparent_attributes,
check_weak_enum_attributes, parse_attributes,
};
use quote::quote;
use syn::punctuated::Punctuated;
use syn::token::Comma;
use syn::{
parse_quote, Block, Data, DataEnum, DataStruct, DeriveInput, Expr, Field, Fields, FieldsNamed,
FieldsUnnamed, Variant,
};
pub fn expand_derive_encode(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let args = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_encode_transparent(&input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match args.repr {
Some(_) => expand_derive_encode_weak_enum(input, variants),
None => expand_derive_encode_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_encode_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_encode_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
generics.params.insert(0, parse_quote!(DB: sqlx::Database));
generics
.make_where_clause()
.predicates
.push(parse_quote!(#ty: sqlx::encode::Encode<DB>));
let (impl_generics, _, where_clause) = generics.split_for_impl();
Ok(quote!(
impl #impl_generics sqlx::encode::Encode<DB> for #ident #ty_generics #where_clause {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
sqlx::encode::Encode::encode(&self.0, buf)
}
fn encode_nullable(&self, buf: &mut std::vec::Vec<u8>) -> sqlx::encode::IsNull {
sqlx::encode::Encode::encode_nullable(&self.0, buf)
}
fn size_hint(&self) -> usize {
sqlx::encode::Encode::size_hint(&self.0)
}
}
))
}
fn expand_derive_encode_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, &variants)?;
let ident = &input.ident;
Ok(quote!(
impl<DB: sqlx::Database> sqlx::encode::Encode<DB> for #ident where #repr: sqlx::encode::Encode<DB> {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
sqlx::encode::Encode::encode(&(*self as #repr), buf)
}
fn encode_nullable(&self, buf: &mut std::vec::Vec<u8>) -> sqlx::encode::IsNull {
sqlx::encode::Encode::encode_nullable(&(*self as #repr), buf)
}
fn size_hint(&self) -> usize {
sqlx::encode::Encode::size_hint(&(*self as #repr))
}
}
))
}
fn expand_derive_encode_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_strong_enum_attributes(input, &variants)?;
let ident = &input.ident;
let mut value_arms = Vec::new();
for v in variants {
let id = &v.ident;
let attributes = parse_attributes(&v.attrs)?;
if let Some(rename) = attributes.rename {
value_arms.push(quote!(#ident :: #id => #rename,));
} else {
let name = id.to_string();
value_arms.push(quote!(#ident :: #id => #name,));
}
}
Ok(quote!(
impl<DB: sqlx::Database> sqlx::encode::Encode<DB> for #ident where str: sqlx::encode::Encode<DB> {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
let val = match self {
#(#value_arms)*
};
<str as sqlx::encode::Encode<DB>>::encode(val, buf)
}
fn size_hint(&self) -> usize {
let val = match self {
#(#value_arms)*
};
<str as sqlx::encode::Encode<DB>>::size_hint(val)
}
}
))
}
fn expand_derive_encode_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
check_struct_attributes(input, &fields)?;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let ident = &input.ident;
let column_count = fields.len();
// extract type generics
let generics = &input.generics;
let (_, ty_generics, _) = generics.split_for_impl();
// add db type for impl generics & where clause
let mut generics = generics.clone();
let predicates = &mut generics.make_where_clause().predicates;
for field in fields {
let ty = &field.ty;
predicates.push(parse_quote!(#ty: sqlx::encode::Encode<sqlx::Postgres>));
predicates.push(parse_quote!(sqlx::Postgres: sqlx::types::HasSqlType<#ty>));
}
let (impl_generics, _, where_clause) = generics.split_for_impl();
let mut writes: Vec<Block> = Vec::new();
for field in fields {
let id = &field.ident;
let ty = &field.ty;
writes.push(parse_quote!({
// write oid
let info = <sqlx::Postgres as sqlx::types::HasSqlType<#ty>>::type_info();
buf.extend(&info.oid().to_be_bytes());
// write zeros for length
buf.extend(&[0; 4]);
let start = buf.len();
sqlx::encode::Encode::<sqlx::Postgres>::encode(&self. #id, buf);
let end = buf.len();
let size = end - start;
// replaces zeros with actual length
buf[start-4..start].copy_from_slice(&(size as u32).to_be_bytes());
}));
}
let mut sizes: Vec<Expr> = Vec::new();
for field in fields {
let id = &field.ident;
let ty = &field.ty;
sizes.push(
parse_quote!(<#ty as sqlx::encode::Encode<sqlx::Postgres>>::size_hint(&self. #id)),
);
}
tts.extend(quote!(
impl #impl_generics sqlx::encode::Encode<sqlx::Postgres> for #ident #ty_generics #where_clause {
fn encode(&self, buf: &mut std::vec::Vec<u8>) {
buf.extend(&(#column_count as u32).to_be_bytes());
#(#writes)*
}
fn size_hint(&self) -> usize {
4 + #column_count * (4 + 4) + #(#sizes)+*
}
}
));
}
Ok(tts)
}

169
sqlx-macros/src/derives/has_sql_type.rs Normal file
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@ -0,0 +1,169 @@
use super::attributes::{
check_strong_enum_attributes, check_struct_attributes, check_transparent_attributes,
check_weak_enum_attributes, parse_attributes,
};
use quote::quote;
use syn::punctuated::Punctuated;
use syn::token::Comma;
use syn::{
parse_quote, Data, DataEnum, DataStruct, DeriveInput, Field, Fields, FieldsNamed,
FieldsUnnamed, Variant,
};
pub fn expand_derive_has_sql_type(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let attrs = parse_attributes(&input.attrs)?;
match &input.data {
Data::Struct(DataStruct {
fields: Fields::Unnamed(FieldsUnnamed { unnamed, .. }),
..
}) if unnamed.len() == 1 => {
expand_derive_has_sql_type_transparent(input, unnamed.first().unwrap())
}
Data::Enum(DataEnum { variants, .. }) => match attrs.repr {
Some(_) => expand_derive_has_sql_type_weak_enum(input, variants),
None => expand_derive_has_sql_type_strong_enum(input, variants),
},
Data::Struct(DataStruct {
fields: Fields::Named(FieldsNamed { named, .. }),
..
}) => expand_derive_has_sql_type_struct(input, named),
_ => Err(syn::Error::new_spanned(
input,
"expected a tuple struct with a single field",
)),
}
}
fn expand_derive_has_sql_type_transparent(
input: &DeriveInput,
field: &Field,
) -> syn::Result<proc_macro2::TokenStream> {
check_transparent_attributes(input, field)?;
let ident = &input.ident;
let ty = &field.ty;
// extract type generics
let generics = &input.generics;
let (impl_generics, ty_generics, _) = generics.split_for_impl();
// add db type for clause
let mut generics = generics.clone();
generics
.make_where_clause()
.predicates
.push(parse_quote!(Self: sqlx::types::HasSqlType<#ty>));
let (_, _, where_clause) = generics.split_for_impl();
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl #impl_generics sqlx::types::HasSqlType< #ident #ty_generics > for sqlx::MySql #where_clause {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#ty>>::type_info()
}
}
));
}
if cfg!(feature = "postgres") {
tts.extend(quote!(
impl #impl_generics sqlx::types::HasSqlType< #ident #ty_generics > for sqlx::Postgres #where_clause {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#ty>>::type_info()
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_weak_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let repr = check_weak_enum_attributes(input, variants)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::MySql where Self: sqlx::types::HasSqlType< #repr > {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#repr>>::type_info()
}
}
));
}
if cfg!(feature = "postgres") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres where Self: sqlx::types::HasSqlType< #repr > {
fn type_info() -> Self::TypeInfo {
<Self as HasSqlType<#repr>>::type_info()
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_strong_enum(
input: &DeriveInput,
variants: &Punctuated<Variant, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let attributes = check_strong_enum_attributes(input, variants)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "mysql") {
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::MySql {
fn type_info() -> Self::TypeInfo {
sqlx::mysql::MySqlTypeInfo::r#enum()
}
}
));
}
if cfg!(feature = "postgres") {
let oid = attributes.postgres_oid.unwrap();
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres {
fn type_info() -> Self::TypeInfo {
sqlx::postgres::PgTypeInfo::with_oid(#oid)
}
}
));
}
Ok(tts)
}
fn expand_derive_has_sql_type_struct(
input: &DeriveInput,
fields: &Punctuated<Field, Comma>,
) -> syn::Result<proc_macro2::TokenStream> {
let attributes = check_struct_attributes(input, fields)?;
let ident = &input.ident;
let mut tts = proc_macro2::TokenStream::new();
if cfg!(feature = "postgres") {
let oid = attributes.postgres_oid.unwrap();
tts.extend(quote!(
impl sqlx::types::HasSqlType< #ident > for sqlx::Postgres {
fn type_info() -> Self::TypeInfo {
sqlx::postgres::PgTypeInfo::with_oid(#oid)
}
}
));
}
Ok(tts)
}

25
sqlx-macros/src/derives/mod.rs Normal file
View File

@ -0,0 +1,25 @@
mod attributes;
mod decode;
mod encode;
mod has_sql_type;
pub(crate) use decode::expand_derive_decode;
pub(crate) use encode::expand_derive_encode;
pub(crate) use has_sql_type::expand_derive_has_sql_type;
use std::iter::FromIterator;
use syn::DeriveInput;
pub(crate) fn expand_derive_type(input: &DeriveInput) -> syn::Result<proc_macro2::TokenStream> {
let encode_tts = expand_derive_encode(input)?;
let decode_tts = expand_derive_decode(input)?;
let has_sql_type_tts = expand_derive_has_sql_type(input)?;
let combined = proc_macro2::TokenStream::from_iter(
encode_tts
.into_iter()
.chain(decode_tts)
.chain(has_sql_type_tts),
);
Ok(combined)
}