From 96ac2aa97951b0ebb3ba7a37821a921a5468fd0e Mon Sep 17 00:00:00 2001 From: Lucien Cartier-Tilet Date: Sun, 26 Jan 2025 15:03:24 +0100 Subject: [PATCH] chore: migrate source code from old repo to this repo --- Cargo.lock | 1886 +++++++++++++++++ georm-macros/Cargo.toml | 17 + georm-macros/src/georm/ir.rs | 233 ++ georm-macros/src/georm/mod.rs | 60 + georm-macros/src/georm/relationships.rs | 54 + .../src/georm/trait_implementation.rs | 137 ++ georm-macros/src/lib.rs | 82 + src/lib.rs | 75 + 8 files changed, 2544 insertions(+) create mode 100644 Cargo.lock create mode 100644 georm-macros/Cargo.toml create mode 100644 georm-macros/src/georm/ir.rs create mode 100644 georm-macros/src/georm/mod.rs create mode 100644 georm-macros/src/georm/relationships.rs create mode 100644 georm-macros/src/georm/trait_implementation.rs create mode 100644 georm-macros/src/lib.rs create mode 100644 src/lib.rs diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..207674c --- /dev/null +++ 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file mode 100644 index 0000000..77c1e78 --- /dev/null +++ b/georm-macros/Cargo.toml @@ -0,0 +1,17 @@ +[package] +name = "georm-macros" +description = "Macro support for Georm. Not intended to be used directly." +version.workspace = true +license.workspace = true +edition.workspace = true +authors.workspace = true +repository.workspace = true + +[lib] +proc-macro = true + +[dependencies] +deluxe = "0.5.0" +proc-macro2 = "1.0.93" +quote = "1.0.38" +syn = "2.0.96" \ No newline at end of file diff --git a/georm-macros/src/georm/ir.rs b/georm-macros/src/georm/ir.rs new file mode 100644 index 0000000..b447a86 --- /dev/null +++ b/georm-macros/src/georm/ir.rs @@ -0,0 +1,233 @@ +use quote::quote; +use std::fmt::{self, Display}; + +#[derive(deluxe::ExtractAttributes)] +#[deluxe(attributes(georm))] +pub struct GeormStructAttributes { + pub table: String, + #[deluxe(default = Vec::new())] + pub one_to_many: Vec, + #[deluxe(default = Vec::new())] + pub many_to_many: Vec, +} + +#[derive(deluxe::ParseMetaItem)] +pub struct O2MRelationship { + pub name: String, + pub remote_id: String, + pub table: String, + pub entity: syn::Type, +} + +impl From<&O2MRelationship> for proc_macro2::TokenStream { + fn from(value: &O2MRelationship) -> Self { + let query = format!( + "SELECT * FROM {} WHERE {} = $1", + value.table, value.remote_id + ); + let entity = &value.entity; + let function = syn::Ident::new( + &format!("get_{}", value.name), + proc_macro2::Span::call_site(), + ); + quote! { + pub async fn #function(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result> { + query_as!(#entity, #query, self.get_id()).fetch_all(pool).await + } + } + } +} + +#[derive(deluxe::ParseMetaItem, Clone)] +pub struct M2MLink { + pub table: String, + pub from: String, + pub to: String, +} + +//#[georm( +// table = "users", +// many_to_many = [ +// { +// name = friends, +// entity: User, +// link = { table = "user_friendships", from: "user1", to "user2" } +// } +// ] +//)] +#[derive(deluxe::ParseMetaItem)] +pub struct M2MRelationship { + pub name: String, + pub entity: syn::Type, + pub table: String, + #[deluxe(default = String::from("id"))] + pub remote_id: String, + pub link: M2MLink, +} + +pub struct Identifier { + pub table: String, + pub id: String, +} + +pub struct M2MRelationshipComplete { + pub name: String, + pub entity: syn::Type, + pub local: Identifier, + pub remote: Identifier, + pub link: M2MLink, +} + +impl M2MRelationshipComplete { + pub fn new(other: &M2MRelationship, local_table: &String, local_id: String) -> Self { + Self { + name: other.name.clone(), + entity: other.entity.clone(), + link: other.link.clone(), + local: Identifier { + table: local_table.to_string(), + id: local_id, + }, + remote: Identifier { + table: other.table.clone(), + id: other.remote_id.clone(), + }, + } + } +} + +impl From<&M2MRelationshipComplete> for proc_macro2::TokenStream { + fn from(value: &M2MRelationshipComplete) -> Self { + let function = syn::Ident::new( + &format!("get_{}", value.name), + proc_macro2::Span::call_site(), + ); + let entity = &value.entity; + let query = format!( + " +SELECT remote.* +FROM {} local +JOIN {} link ON link.{} = local.{} +JOIN {} remote ON link.{} = remote.{} +WHERE local.{} = $1 +", + value.local.table, + value.link.table, + value.link.from, + value.local.id, + value.remote.table, + value.link.to, + value.remote.id, + value.local.id + ); + quote! { + pub async fn #function(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result> { + query_as!(#entity, #query, self.get_id()).fetch_all(pool).await + } + } + } +} + +#[derive(deluxe::ExtractAttributes, Clone)] +#[deluxe(attributes(georm))] +struct GeormFieldAttributes { + #[deluxe(default = false)] + pub id: bool, + #[deluxe(default = None)] + pub column: Option, + #[deluxe(default = None)] + pub relation: Option, +} + +// #[georm( +// table = "profileId", +// one_to_one = { name = profile, id = "id", entity = Profile, nullable } +// )] +#[derive(deluxe::ParseMetaItem, Clone)] +pub struct O2ORelationship { + pub entity: syn::Type, + pub table: String, + #[deluxe(default = String::from("id"))] + pub remote_id: String, + #[deluxe(default = false)] + pub nullable: bool, + pub name: String, +} + +#[derive(Clone)] +pub struct GeormField { + pub ident: syn::Ident, + pub field: syn::Field, + pub ty: syn::Type, + pub column: Option, + pub id: bool, + pub relation: Option, +} + +impl GeormField { + pub fn new(field: &mut syn::Field) -> Self { + let ident = field.clone().ident.unwrap(); + let ty = field.clone().ty; + let attrs: GeormFieldAttributes = + deluxe::extract_attributes(field).expect("Could not extract attributes from field"); + let GeormFieldAttributes { + id, + column, + relation, + } = attrs; + Self { + ident, + field: field.to_owned(), + id, + ty, + relation, + column, + } + } +} + +impl Display for GeormField { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + write!( + f, + "{}", + self.column + .clone() + .unwrap_or_else(|| self.ident.to_string()) + ) + } +} + +impl From<&GeormField> for proc_macro2::TokenStream { + fn from(value: &GeormField) -> Self { + let Some(relation) = value.relation.clone() else { + return quote! {}; + }; + + let function = syn::Ident::new( + &format!("get_{}", relation.name), + proc_macro2::Span::call_site(), + ); + let entity = &relation.entity; + let return_type = if relation.nullable { + quote! { Option<#entity> } + } else { + quote! { #entity } + }; + let query = format!( + "SELECT * FROM {} WHERE {} = $1", + relation.table, relation.remote_id + ); + let local_ident = &value.field.ident; + let fetch = if relation.nullable { + quote! { fetch_optional } + } else { + quote! { fetch_one } + }; + quote! { + pub async fn #function(&value, pool: &::sqlx::PgPool) -> ::sqlx::Result<#return_type> { + query_as!(#entity, #query, value.#local_ident).#fetch(pool).await + } + } + } +} diff --git a/georm-macros/src/georm/mod.rs b/georm-macros/src/georm/mod.rs new file mode 100644 index 0000000..f8e39c7 --- /dev/null +++ b/georm-macros/src/georm/mod.rs @@ -0,0 +1,60 @@ +use ir::GeormField; +use quote::quote; + +mod ir; +mod relationships; +mod trait_implementation; + +fn extract_georm_field_attrs( + ast: &mut syn::DeriveInput, +) -> deluxe::Result<(Vec, GeormField)> { + let syn::Data::Struct(s) = &mut ast.data else { + return Err(syn::Error::new_spanned( + ast, + "Cannot apply to something other than a struct", + )); + }; + let fields = s + .fields + .clone() + .into_iter() + .map(|mut field| GeormField::new(&mut field)) + .collect::>(); + let identifiers: Vec = fields + .clone() + .into_iter() + .filter(|field| field.id) + .collect(); + match identifiers.len() { + 0 => Err(syn::Error::new_spanned( + ast, + "Struct {name} must have one identifier", + )), + 1 => Ok((fields, identifiers.first().unwrap().clone())), + _ => { + let id1 = identifiers.first().unwrap(); + let id2 = identifiers.get(1).unwrap(); + Err(syn::Error::new_spanned(id2.field.clone(), format!( + "Field {} cannot be an identifier, {} already is one.\nOnly one identifier is supported.", + id1.ident, id2.ident + ))) + } + } +} + +pub fn georm_derive_macro2( + item: proc_macro2::TokenStream, +) -> deluxe::Result { + let mut ast: syn::DeriveInput = syn::parse2(item).expect("Failed to parse input"); + let struct_attrs: ir::GeormStructAttributes = + deluxe::extract_attributes(&mut ast).expect("Could not extract attributes from struct"); + let (fields, id) = extract_georm_field_attrs(&mut ast)?; + let trait_impl = trait_implementation::derive_trait(&ast, &struct_attrs.table, &fields, &id); + let relationships = relationships::derive_relationships(&ast, &struct_attrs, &fields, &id); + let code = quote! { + #trait_impl + #relationships + }; + println!("{code}"); + Ok(code) +} diff --git a/georm-macros/src/georm/relationships.rs b/georm-macros/src/georm/relationships.rs new file mode 100644 index 0000000..3f9e2a3 --- /dev/null +++ b/georm-macros/src/georm/relationships.rs @@ -0,0 +1,54 @@ +use std::str::FromStr; + +use crate::georm::ir::M2MRelationshipComplete; + +use super::ir::GeormField; +use proc_macro2::TokenStream; +use quote::quote; + +fn join_token_streams(token_streams: &[TokenStream]) -> TokenStream { + let newline = TokenStream::from_str("\n").unwrap(); + token_streams + .iter() + .cloned() + .flat_map(|ts| std::iter::once(ts).chain(std::iter::once(newline.clone()))) + .collect() +} + +fn derive(relationships: &[T], condition: P) -> TokenStream +where + for<'a> &'a T: Into, + P: FnMut(&&T) -> bool, +{ + let implementations: Vec = relationships + .iter() + .filter(condition) + .map(std::convert::Into::into) + .collect(); + join_token_streams(&implementations) +} + +pub fn derive_relationships( + ast: &syn::DeriveInput, + struct_attrs: &super::ir::GeormStructAttributes, + fields: &[GeormField], + id: &GeormField, +) -> TokenStream { + let struct_name = &ast.ident; + let one_to_one = derive(fields, |field| field.relation.is_none()); + let one_to_many = derive(&struct_attrs.one_to_many, |_| true); + let many_to_many: Vec = struct_attrs + .many_to_many + .iter() + .map(|v| M2MRelationshipComplete::new(v, &struct_attrs.table, id.to_string())) + .collect(); + let many_to_many = derive(&many_to_many, |_| true); + + quote! { + impl #struct_name { + #one_to_one + #one_to_many + #many_to_many + } + } +} diff --git a/georm-macros/src/georm/trait_implementation.rs b/georm-macros/src/georm/trait_implementation.rs new file mode 100644 index 0000000..08dc57e --- /dev/null +++ b/georm-macros/src/georm/trait_implementation.rs @@ -0,0 +1,137 @@ +use super::ir::GeormField; +use quote::quote; + +fn generate_find_query(table: &str, id: &GeormField) -> proc_macro2::TokenStream { + let find_string = format!("SELECT * FROM {table} WHERE {id} = $1",); + let ty = &id.ty; + quote! { + async fn find(pool: &::sqlx::PgPool, id: &#ty) -> ::sqlx::Result> { + ::sqlx::query_as!(Self, #find_string, id) + .fetch_optional(pool) + .await + } + } +} + +fn generate_create_query(table: &str, fields: &[GeormField]) -> proc_macro2::TokenStream { + let inputs: Vec = (1..=fields.len()).map(|num| format!("${num}")).collect(); + let create_string = format!( + "INSERT INTO {table} ({}) VALUES ({}) RETURNING *", + fields + .iter() + .map(std::string::ToString::to_string) + .collect::>() + .join(", "), + inputs.join(", ") + ); + let field_idents: Vec = fields.iter().map(|f| f.ident.clone()).collect(); + quote! { + async fn create(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result { + ::sqlx::query_as!( + Self, + #create_string, + #(self.#field_idents),* + ) + .fetch_one(pool) + .await + } + } +} + +fn generate_update_query( + table: &str, + fields: &[GeormField], + id: &GeormField, +) -> proc_macro2::TokenStream { + let mut fields: Vec<&GeormField> = fields.iter().filter(|f| !f.id).collect(); + let update_columns = fields + .iter() + .enumerate() + .map(|(i, &field)| format!("{field} = ${}", i + 1)) + .collect::>() + .join(", "); + let update_string = format!( + "UPDATE {table} SET {update_columns} WHERE {id} = ${} RETURNING *", + fields.len() + 1 + ); + fields.push(id); + let field_idents: Vec<_> = fields.iter().map(|f| f.ident.clone()).collect(); + quote! { + async fn update(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result { + ::sqlx::query_as!( + Self, + #update_string, + #(self.#field_idents),* + ) + .fetch_one(pool) + .await + } + } +} + +fn generate_delete_query(table: &str, id: &GeormField) -> proc_macro2::TokenStream { + let delete_string = format!("DELETE FROM {table} WHERE {id} = $1"); + let ty = &id.ty; + quote! { + async fn delete_by_id(pool: &::sqlx::PgPool, id: &#ty) -> ::sqlx::Result { + let rows_affected = ::sqlx::query!(#delete_string, id) + .execute(pool) + .await? + .rows_affected(); + Ok(rows_affected) + } + + async fn delete(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result { + Self::delete_by_id(pool, self.get_id()).await + } + } +} + +fn generate_get_id(id: &GeormField) -> proc_macro2::TokenStream { + let ident = &id.ident; + let ty = &id.ty; + quote! { + fn get_id(&self) -> &#ty { + &self.#ident + } + } +} + +pub fn derive_trait( + ast: &syn::DeriveInput, + table: &str, + fields: &[GeormField], + id: &GeormField, +) -> proc_macro2::TokenStream { + let ty = &id.ty; + let id_ident = &id.ident; + + // define impl variables + let ident = &ast.ident; + let (impl_generics, type_generics, where_clause) = ast.generics.split_for_impl(); + + // generate + let get_id = generate_get_id(id); + let find_query = generate_find_query(table, id); + let create_query = generate_create_query(table, fields); + let update_query = generate_update_query(table, fields, id); + let delete_query = generate_delete_query(table, id); + quote! { + impl #impl_generics Georm<#ty> for #ident #type_generics #where_clause { + #get_id + #find_query + #create_query + #update_query + + async fn create_or_update(&self, pool: &::sqlx::PgPool) -> ::sqlx::Result { + if Self::find(pool, &self.#id_ident).await?.is_some() { + self.update(pool).await + } else { + self.create(pool).await + } + } + + #delete_query + } + } +} diff --git a/georm-macros/src/lib.rs b/georm-macros/src/lib.rs new file mode 100644 index 0000000..a21b78a --- /dev/null +++ b/georm-macros/src/lib.rs @@ -0,0 +1,82 @@ +//! Creates ORM functionality for ``SQLx`` with `PostgreSQL`. +//! +//! This crate provides the trait implementation `Georm` which +//! generates the following ``SQLx`` queries: +//! - find an entity by id +//! +//! SQL query: `SELECT * FROM ... WHERE = ...` +//! - insert an entity into the database +//! +//! SQL query: `INSERT INTO ... (...) VALUES (...) RETURNING *` +//! - update an entity in the database +//! +//! SQL query: `UPDATE ... SET ... WHERE = ... RETURNING *` +//! - delete an entity from the database using its id or an id +//! provided by the interface’s user +//! +//! SQL query: `DELETE FROM ... WHERE = ...` +//! - update an entity or create it if it does not already exist in +//! the database +//! +//! This macro relies on the trait `Georm` found in the `georm` +//! crate. +//! +//! To use this macro, you need to add it to the derives of the +//! struct. You will also need to define its identifier +//! +//! # Usage +//! +//! Add `#[georm(table = "my_table_name")]` atop of the structure, +//! after the `Georm` derive. +//! +//! ## Entity Identifier +//! You will also need to add `#[georm(id)]` atop of the field of your +//! struct that will be used as the identifier of your entity. +//! +//! ## Column Name +//! If the name of a field does not match the name of its related +//! column, you can use `#[georm(column = "...")]` to specify the +//! correct value. +//! +//! ```ignore +//! #[derive(Georm)] +//! #[georm(table = "users")] +//! pub struct User { +//! #[georm(id)] +//! id: String, +//! #[georm(column = "name")] +//! username: String, +//! created_at: Timestampz, +//! last_updated: Timestampz, +//! } +//! ``` +//! +//! With the example of the `User` struct, this links it to the +//! `users` table of the connected database. It will use `Users.id` to +//! uniquely identify a user entity. +//! +//! # Limitations +//! ## ID +//! For now, only one identifier is supported. It does not have to be +//! a primary key, but it is strongly encouraged to use Georm ID on a +//! unique and non-null column of your database schema. +//! +//! ## Database type +//! +//! For now, only the ``PostgreSQL`` syntax is supported. If you use +//! another database that uses the same syntax, you’re in luck! +//! Otherwise, pull requests to add additional syntaxes are most +//! welcome. + +mod georm; +use georm::georm_derive_macro2; + +/// Generates GEORM code for Sqlx for a struct. +/// +/// # Panics +/// +/// May panic if errors arise while parsing and generating code. +#[proc_macro_derive(Georm, attributes(georm))] +pub fn georm_derive_macro(item: proc_macro::TokenStream) -> proc_macro::TokenStream { + georm_derive_macro2(item.into()).unwrap().into() +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..cfd72b0 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,75 @@ +pub use georm_macros::Georm; + +pub trait Georm { + /// Find the entiy in the database based on its identifier. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn find( + pool: &sqlx::PgPool, + id: &Id, + ) -> impl std::future::Future>> + Send + where + Self: Sized; + + /// Create the entity in the database. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn create( + &self, + pool: &sqlx::PgPool, + ) -> impl std::future::Future> + Send + where + Self: Sized; + + /// Update an entity with a matching identifier in the database. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn update( + &self, + pool: &sqlx::PgPool, + ) -> impl std::future::Future> + Send + where + Self: Sized; + + /// Update an entity with a matching identifier in the database if + /// it exists, create it otherwise. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn create_or_update( + &self, + pool: &sqlx::PgPool, + ) -> impl std::future::Future> + Send + where + Self: Sized; + + /// Delete the entity from the database if it exists. + /// + /// # Returns + /// Returns the amount of rows affected by the deletion. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn delete( + &self, + pool: &sqlx::PgPool, + ) -> impl std::future::Future> + Send; + + /// Delete any entity with the identifier `id`. + /// + /// # Returns + /// Returns the amount of rows affected by the deletion. + /// + /// # Errors + /// Returns any error Postgres may have encountered + fn delete_by_id( + pool: &sqlx::PgPool, + id: &Id, + ) -> impl std::future::Future> + Send; + + /// Returns the identifier of the entity. + fn get_id(&self) -> &Id; +}