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use crate::util::{self, ParsedAttributeMap};
use quote::quote;
use syn::{DataStruct, Fields, Ident};
pub fn derive_to_redis_struct(
data_struct: DataStruct,
type_ident: Ident,
attrs: ParsedAttributeMap,
) -> proc_macro::TokenStream {
match &data_struct.fields {
Fields::Named(fields_named) => {
let mut regular_fields = Vec::new();
for field in &fields_named.named {
let field_ident = field.ident.as_ref().expect("Named field should have ident");
let field_attrs = util::parse_field_attributes(&field.attrs);
if field_attrs.skip {
continue;
}
let field_name = util::transform_field_name(
&field_ident.to_string(),
attrs.rename_all.as_ref(),
field_attrs.rename.as_ref(),
);
regular_fields.push((field_ident, field_name.clone()));
}
let (field_idents, field_names): (Vec<_>, Vec<_>) =
regular_fields.into_iter().unzip();
// Generate the basic ToRedisArgs implementation
let to_redis_impl = quote! {
impl redis::ToRedisArgs for #type_ident {
fn write_redis_args<W: ?Sized + redis::RedisWrite>(&self, out: &mut W) {
// Write each field as key-value pairs for hash storage
#(
out.write_arg(#field_names.as_bytes());
(&self.#field_idents).write_redis_args(out);
)*
}
fn num_of_args(&self) -> usize {
let mut count = 0;
#(
count += 1; // field name
count += (&self.#field_idents).num_of_args(); // field value args
)*
count
}
}
};
to_redis_impl.into()
}
Fields::Unnamed(fields_unnamed) => {
let field_count = fields_unnamed.unnamed.len();
let indices: Vec<usize> = (0..field_count).collect();
let to_redis_impl = quote! {
impl redis::ToRedisArgs for #type_ident {
fn write_redis_args<W: ?Sized + redis::RedisWrite>(&self, out: &mut W) {
// Write tuple struct fields as an array
#(
(&self.#indices).write_redis_args(out);
)*
}
fn num_of_args(&self) -> usize {
let mut count = 0;
#(
count += (&self.#indices).num_of_args();
)*
count
}
}
};
to_redis_impl.into()
}
Fields::Unit => {
let to_redis_impl = quote! {
impl redis::ToRedisArgs for #type_ident {
fn write_redis_args<W: ?Sized + redis::RedisWrite>(&self, _out: &mut W) {
// Unit structs don't write any args
}
fn num_of_args(&self) -> usize {
0
}
}
};
to_redis_impl.into()
}
}
}
pub fn derive_from_redis_struct(
data_struct: DataStruct,
type_ident: Ident,
attrs: ParsedAttributeMap,
) -> proc_macro::TokenStream {
match &data_struct.fields {
Fields::Named(fields_named) => {
let mut regular_fields = Vec::new();
for field in &fields_named.named {
let field_ident = field.ident.as_ref().expect("Named field should have ident");
let field_attrs = util::parse_field_attributes(&field.attrs);
if field_attrs.skip {
continue;
}
let field_name = util::transform_field_name(
&field_ident.to_string(),
attrs.rename_all.as_ref(),
field_attrs.rename.as_ref(),
);
regular_fields.push((field_ident, field_name));
}
let (field_idents, field_names): (Vec<_>, Vec<_>) =
regular_fields.into_iter().unzip();
let from_redis_impl = quote! {
impl redis::FromRedisValue for #type_ident {
fn from_redis_value(v: &redis::Value) -> redis::RedisResult<Self> {
match v {
redis::Value::Array(items) if items.len() % 2 == 0 => {
let mut fields_map = std::collections::HashMap::new();
// Parse key-value pairs from array
for chunk in items.chunks(2) {
let key: String = redis::FromRedisValue::from_redis_value(&chunk[0])?;
fields_map.insert(key, &chunk[1]);
}
Ok(Self {
#(
#field_idents: {
match fields_map.get(#field_names) {
Some(value) => redis::FromRedisValue::from_redis_value(value)
.map_err(|e| redis::RedisError::from((
redis::ErrorKind::TypeError,
"Failed to parse field",
format!("Field '{}': {}", #field_names, e),
)))?,
None => return Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Missing required field",
#field_names.to_string(),
))),
}
},
)*
})
}
redis::Value::Map(map) => {
// Handle Redis hash/map type (RESP3)
let mut fields_map = std::collections::HashMap::new();
for (key, value) in map {
let key_str: String = redis::FromRedisValue::from_redis_value(key)?;
fields_map.insert(key_str, value);
}
Ok(Self {
#(
#field_idents: {
match fields_map.get(#field_names) {
Some(value) => redis::FromRedisValue::from_redis_value(value)
.map_err(|e| redis::RedisError::from((
redis::ErrorKind::TypeError,
"Failed to parse field",
format!("Field '{}': {}", #field_names, e),
)))?,
None => return Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Missing required field",
#field_names.to_string(),
))),
}
},
)*
})
}
redis::Value::Nil => {
Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Cannot deserialize struct from nil value",
)))
}
_ => {
Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Expected Array or Map for struct",
)))
}
}
}
}
};
from_redis_impl.into()
}
Fields::Unnamed(fields_unnamed) => {
let field_count = fields_unnamed.unnamed.len();
let indices: Vec<syn::Index> = (0..field_count)
.map(syn::Index::from)
.collect();
let from_redis_impl = quote! {
impl redis::FromRedisValue for #type_ident {
fn from_redis_value(v: &redis::Value) -> redis::RedisResult<Self> {
match v {
redis::Value::Array(items) => {
if items.len() != #field_count {
return Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Array length mismatch",
format!("Expected {} elements, got {}", #field_count, items.len()),
)));
}
Ok(Self(
#(
redis::FromRedisValue::from_redis_value(&items[#indices])
.map_err(|e| redis::RedisError::from((
redis::ErrorKind::TypeError,
"Failed to parse tuple element",
format!("At index {}: {}", #indices, e),
)))?,
)*
))
}
redis::Value::Nil => {
Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Cannot deserialize tuple struct from nil",
)))
}
_ => {
Err(redis::RedisError::from((
redis::ErrorKind::TypeError,
"Expected Array for tuple struct",
)))
}
}
}
}
};
from_redis_impl.into()
}
Fields::Unit => {
let from_redis_impl = quote! {
impl redis::FromRedisValue for #type_ident {
fn from_redis_value(_v: &redis::Value) -> redis::RedisResult<Self> {
Ok(Self)
}
}
};
from_redis_impl.into()
}
}
}