From 96f3081f9a1597943c9b40951143d1fe565b9917 Mon Sep 17 00:00:00 2001
From: arcayr <git@arcayr.online>
Date: Sat, 28 Dec 2024 21:48:30 +1100
Subject: [PATCH] add basic traits and a rough sketch of the derive macro.

a lot of this is pillaged from [miniorm](https://github.com/meuter/miniorm-rs) and [sqlx-crud](https://github.com/treydempsey/sqlx-crud) and then streamlined for a specific uuid-only, postgres-only use-case.
---
 Cargo.lock                       | 1807 ++++++++++++++++++++++++++++++
 Cargo.toml                       |    2 +-
 crates/ezpg-macros/Cargo.toml    |    7 +
 crates/ezpg-macros/src/column.rs |   43 +
 crates/ezpg-macros/src/derive.rs |   99 ++
 crates/ezpg-macros/src/lib.rs    |   23 +
 crates/ezpg/Cargo.toml           |    5 +-
 crates/ezpg/src/crud_traits.rs   |  102 ++
 crates/ezpg/src/lib.rs           |   54 +
 9 files changed, 2140 insertions(+), 2 deletions(-)
 create mode 100644 crates/ezpg-macros/src/column.rs
 create mode 100644 crates/ezpg-macros/src/derive.rs
 create mode 100644 crates/ezpg/src/crud_traits.rs

diff --git a/Cargo.lock b/Cargo.lock
index 52b8d51..a555e9a 100644
--- a/Cargo.lock
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+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
+
+[[package]]
+name = "zerovec"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6eafa6dfb17584ea3e2bd6e76e0cc15ad7af12b09abdd1ca55961bed9b1063c6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 7220d11..93b61f4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [workspace]
+resolver = "2"
 members = [
     "crates/ezpg",
     "crates/ezpg-macros",
 ]
-resolver = "2"
diff --git a/crates/ezpg-macros/Cargo.toml b/crates/ezpg-macros/Cargo.toml
index 719e97e..ec8d7cc 100644
--- a/crates/ezpg-macros/Cargo.toml
+++ b/crates/ezpg-macros/Cargo.toml
@@ -5,3 +5,10 @@ edition = "2021"
 
 [lib]
 proc-macro = true
+
+[dependencies]
+darling = "0.20.10"
+itertools = "0.13.0"
+proc-macro2 = "1.0.92"
+quote = "1.0.38"
+syn = "2.0.92"
diff --git a/crates/ezpg-macros/src/column.rs b/crates/ezpg-macros/src/column.rs
new file mode 100644
index 0000000..c8832c7
--- /dev/null
+++ b/crates/ezpg-macros/src/column.rs
@@ -0,0 +1,43 @@
+use darling::FromField;
+use proc_macro2::Ident;
+use quote::quote;
+
+/// an individual record column, corresponding to a field
+/// on the parent struct.
+#[derive(Clone, Debug, FromField)]
+#[darling(attributes(sqlx))]
+pub(crate) struct Column {
+    ident: Option<Ident>,
+    rename: Option<String>,
+    #[darling(default)]
+    skip: bool,
+}
+
+impl Column {
+    /// returns the column's [proc_macro2::Ident]. this will usually be
+    /// a rust keyword.
+    pub fn ident(&self) -> &Ident {
+        self.ident.as_ref().unwrap()
+    }
+
+    /// returns the column's name, either the `rename` attribute, or the
+    /// column name itself.
+    pub fn name(&self) -> String {
+        self
+            .rename
+            .as_ref()
+            .cloned()
+            .unwrap_or(self.ident().to_string())
+    }
+
+    /// returns the column's value or 'content'.
+    pub fn value(&self) -> proc_macro2::TokenStream {
+        let field_ident = self.ident();
+        quote!(self.#field_ident.clone())
+    }
+
+    /// whether to skip this column.
+    pub fn skip(&self) -> bool {
+        self.skip
+    }
+}
diff --git a/crates/ezpg-macros/src/derive.rs b/crates/ezpg-macros/src/derive.rs
new file mode 100644
index 0000000..340ce83
--- /dev/null
+++ b/crates/ezpg-macros/src/derive.rs
@@ -0,0 +1,99 @@
+use darling::{ast::Data, FromDeriveInput};
+use itertools::Itertools;
+use quote::quote;
+use syn::Ident;
+use crate::Column;
+
+#[derive(FromDeriveInput)]
+#[darling(attributes(sqlx), supports(struct_named))]
+pub(crate) struct RecordDerive {
+    ident: Ident,
+    rename: Option<String>,
+    data: Data<(), Column>,
+}
+
+impl RecordDerive {
+    fn table_name(&self) -> String {
+        self.rename
+            .as_ref()
+            .cloned()
+            .unwrap_or(self.ident.to_string().to_lowercase())
+    }
+
+    // returns all columns that are not marked `skip`.
+    pub fn columns(&self) -> impl Iterator<Item = &Column> {
+        match &self.data {
+            Data::Enum(_) => unreachable!(),
+            Data::Struct(fields) => fields.fields.iter().filter(|c| !c.skip()),
+        }
+    }
+
+    // generates the record c/r/u/d query strings.
+    pub fn gen_withqueries_impl(&self) -> proc_macro2::TokenStream {
+        let ident = &self.ident;
+        let table_name = self.table_name();
+
+        // a string representing the columns in the table, joined with a ",".
+        let column_names = self.columns().map(|c| c.name());
+        let column_names_join = self.columns().map(|c| c.name()).join(",");
+
+        // e.g., "insert into items (name, weight) values ($1, $2) returning id"
+        let create_query = {
+            let bind_points = self
+                .columns()
+                .enumerate()
+                .map(|(i, _)| format!("${}", i + 1)) // enum starts at 0, column ids start at 1.
+                .join(",");
+
+            format!("insert into {table_name} ({column_names_join}) values ({bind_points}) returning id")
+        };
+
+        // e.g., "select id, name, weight from items limit $1 offset $2"
+        let index_query =
+            format!("select id, {column_names_join} from {table_name} limit $1 offset $2");
+
+        // e.g., "select id, name, weight from items where id = $1"
+        let read_query = format!("select id, {column_names_join} from {table_name} where id = $1");
+
+        let update_query = {
+            let value_pairs = self
+                .columns()
+                .enumerate()
+                .map(|(i, col)| format!("{} = ${}", col.name(), i + 2)) // enum starts at 0, id is 1, other columns start at 2.
+                .join(",");
+
+            format!("update {table_name} set {value_pairs} where id = $1")
+        };
+
+        let delete_query = format!("delete from {table_name} where id = $1");
+
+        quote! {
+            impl ::ezpg::WithQueries for #ident {
+                const COLUMNS: &'static [&'static str] = &[#(#column_names,)*];
+                const CREATE_QUERY: &'static str = #create_query;
+                const INDEX_QUERY: &'static str = #index_query;
+                const READ_QUERY: &'static str = #read_query;
+                const UPDATE_QUERY: &'static str = #update_query;
+                const DELETE_QUERY: &'static str = #delete_query;
+            }
+        }
+    }
+
+    // generates the column binding functions.
+    pub fn gen_column_impl(&self) -> proc_macro2::TokenStream {
+        let ident = &self.ident;
+        let col_name = self.columns().map(|col| col.name());
+        let col_value = self.columns().map(|col| col.value());
+
+        quote! {
+            impl ::ezpg::BindColumn for #ident {
+                fn bind_column<'q, Q: ::ezpg::QueryBind<'q>>(&self, query: Q, column_name: &'static str) -> Q {
+                    match column_name {
+                        #(#col_name => query.bind(#col_value),)*
+                        _ => query,
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/crates/ezpg-macros/src/lib.rs b/crates/ezpg-macros/src/lib.rs
index e69de29..0ac65f6 100644
--- a/crates/ezpg-macros/src/lib.rs
+++ b/crates/ezpg-macros/src/lib.rs
@@ -0,0 +1,23 @@
+mod column;
+pub(crate) use column::Column;
+mod derive;
+use darling::FromDeriveInput;
+use proc_macro::TokenStream;
+use syn::DeriveInput;
+use quote::quote;
+
+#[proc_macro_derive(Record, attributes(sqlx))]
+pub fn derive_record(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = syn::parse_macro_input!(input);
+    let derive_args =
+        derive::RecordDerive::from_derive_input(&input).expect("could not parse derive arguments");
+
+    let queries_impl = derive_args.gen_withqueries_impl();
+    let column_impl = derive_args.gen_column_impl();
+
+    quote! {
+        #queries_impl
+        #column_impl
+    }
+    .into()
+}
diff --git a/crates/ezpg/Cargo.toml b/crates/ezpg/Cargo.toml
index b280d28..204446f 100644
--- a/crates/ezpg/Cargo.toml
+++ b/crates/ezpg/Cargo.toml
@@ -3,4 +3,7 @@ name = "ezpg"
 version = "0.0.0"
 edition = "2021"
 
-[dependencies]
\ No newline at end of file
+[dependencies]
+ezpg_macros = { version = "0.0.0", path = "../ezpg-macros" }
+sqlx = { version = "0.8.2", features = ["macros", "postgres", "uuid"] }
+uuid = { version = "1.11.0", features = ["v7"] }
diff --git a/crates/ezpg/src/crud_traits.rs b/crates/ezpg/src/crud_traits.rs
new file mode 100644
index 0000000..8c49c6e
--- /dev/null
+++ b/crates/ezpg/src/crud_traits.rs
@@ -0,0 +1,102 @@
+//! traits used for c/r/u/d behaviours.
+
+use sqlx::{PgPool, Postgres};
+use uuid::Uuid;
+
+use crate::Record;
+
+/// [c]reate
+pub trait Create<'a, R> {
+    async fn create(&self, pool: &PgPool) -> sqlx::Result<R>;
+}
+
+impl<'a, R> Create<'a, R> for R
+where
+    R: Record,
+    Uuid: sqlx::Encode<'a, Postgres>,
+{
+    async fn create(&self, pool: &PgPool) -> sqlx::Result<R> {
+        let (new_uuid,): (Uuid,) = R::COLUMNS
+            .iter()
+            .fold(sqlx::query_as(R::CREATE_QUERY), |q, c| {
+                self.bind_column(q, c)
+            })
+            .fetch_one(pool)
+            .await?;
+
+        // technically, this could be called as `self.read`, however
+        // there may be some obscure cases where the read trait isn't
+        // applied.
+        sqlx::query_as::<Postgres, R>(R::READ_QUERY)
+            .bind(new_uuid)
+            .fetch_one(pool)
+            .await
+    }
+}
+
+/// [r]ead
+pub trait Read<'a, R>: Record {
+    async fn index(offset: i64, limit: i64, pool: &PgPool) -> sqlx::Result<Vec<R>>;
+    async fn read(id: Uuid, pool: &PgPool) -> sqlx::Result<R>;
+}
+
+impl<'a, R> Read<'a, R> for R
+where
+    R: Record,
+    Uuid: sqlx::Encode<'a, Postgres>,
+{
+    async fn index(offset: i64, limit: i64, pool: &PgPool) -> sqlx::Result<Vec<R>> {
+        sqlx::query_as::<Postgres, R>(R::INDEX_QUERY)
+            .bind(offset)
+            .bind(limit)
+            .fetch_all(pool)
+            .await
+    }
+
+    async fn read(id: Uuid, pool: &PgPool) -> sqlx::Result<R> {
+        sqlx::query_as::<Postgres, R>(R::READ_QUERY)
+            .bind(id)
+            .fetch_one(pool)
+            .await
+    }
+}
+
+/// [c]reate
+pub trait Update<'a, R> {
+    async fn update(&self, pool: &PgPool) -> sqlx::Result<R>;
+}
+
+impl<'a, R> Update<'a, R> for R
+where
+    R: Record,
+    Uuid: sqlx::Encode<'a, Postgres>,
+{
+    async fn update(&self, pool: &PgPool) -> sqlx::Result<R> {
+        R::COLUMNS
+            .iter()
+            .fold(sqlx::query_as(R::UPDATE_QUERY), |q, c| {
+                self.bind_column(q, c)
+            })
+            .fetch_one(pool)
+            .await
+    }
+}
+
+/// [d]elete
+pub trait Delete<'a, R> {
+    async fn delete(&self, pool: &PgPool) -> sqlx::Result<()>;
+}
+
+impl<'a, R> Delete<'a, R> for R
+where
+    R: Record,
+    Uuid: sqlx::Encode<'a, Postgres>,
+{
+    async fn delete(&self, pool: &PgPool) -> sqlx::Result<()> {
+        sqlx::query(R::DELETE_QUERY)
+            .bind(self.id())
+            .execute(pool)
+            .await
+            .map(|_| ()) // i don't like this, but it works.
+    }
+}
diff --git a/crates/ezpg/src/lib.rs b/crates/ezpg/src/lib.rs
index e69de29..53c2a6b 100644
--- a/crates/ezpg/src/lib.rs
+++ b/crates/ezpg/src/lib.rs
@@ -0,0 +1,54 @@
+mod crud_traits;
+
+use sqlx::{postgres::{PgArguments, PgRow}, query::{Query, QueryAs}, Encode, FromRow, Postgres, Type};
+use uuid::Uuid;
+
+// re-export the record macro.
+pub use ezpg_macros::Record;
+
+// the following were stolen from [miniorm by meuter](https://github.com/meuter/miniorm-rs):
+pub trait QueryBind<'q> {
+    fn bind<T>(self, value: T) -> Self
+    where
+        T: 'q + Encode<'q, Postgres> + Type<Postgres>;
+}
+
+impl<'q> QueryBind<'q> for Query<'q, Postgres, PgArguments> {
+    fn bind<T>(self, value: T) -> Self
+    where
+        T: 'q + Encode<'q, Postgres> + Type<Postgres>,
+    {
+        Query::bind(self, value)
+    }
+}
+
+impl<'q, O> QueryBind<'q> for QueryAs<'q, Postgres, O, PgArguments> {
+    fn bind<T>(self, value: T) -> Self
+    where
+        T: 'q + Encode<'q, Postgres> + Type<Postgres>,
+    {
+        QueryAs::bind(self, value)
+    }
+}
+
+/// c/r/u/d queries.
+/// standard crud query strings.
+pub trait WithQueries {
+    const COLUMNS: &'static [&'static str];
+    const CREATE_QUERY: &'static str;
+    const INDEX_QUERY: &'static str;
+    const READ_QUERY: &'static str;
+    const UPDATE_QUERY: &'static str;
+    const DELETE_QUERY: &'static str;
+}
+
+/// binds a value to a field.
+/// used as part of the [ezpg_macros::Record] derive.
+pub trait BindColumn {
+    fn bind_column<'q, Q: QueryBind<'q>>(&self, query: Q, column_name: &'static str) -> Q;
+}
+
+/// a record stored within the postgres db.
+pub trait Record: WithQueries + BindColumn + for<'r> FromRow<'r, PgRow> + Send + Unpin {
+    fn id(&self) -> Uuid;
+}