1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

//! High level dynamodb crate
//!
//! ```ignore
//! use nitroglycerin::{Attributes, Key, Query, Table, DynamoDb, dynamodb::DynamoDbClient};
//! use rusoto_core::Region;
//!
//! #[derive(Debug, PartialEq, Attributes, Key, Query)]
//! struct Employee {
//!     #[nitro(partition_key)]
//!     id: String,
//!     #[nitro(rename = "firstName")]
//!     name: String,
//!     joined: i64,
//!     left: Option<i64>,
//! }
//!
//! impl Table for Employee {
//!     fn table_name() -> String {
//!         "Employees".to_string()
//!     }
//! }
//!
//! #[derive(Debug, PartialEq, Attributes, Query)]
//! struct EmployeeNameIndex {
//!     #[nitro(partition_key, rename = "firstName")]
//!     name: String,
//!     #[nitro(sort_key)]
//!     joined: i64,
//! }
//!
//! impl IndexTable for EmployeeNameIndex {
//!     type Table = Employees;
//!     fn index_name() -> Option<String> {
//!         Some("EmployeeNamesIndex".to_string())
//!     }
//! }
//!
//! let client = DynamoDbClient::new(Region::default());
//!
//! let employee: Option<Employee> = client.get::<Employee>()
//!    .id("emp_1") // get the employee with id "emp_1"
//!    .execute().await?;
//!
//! let new_employee = Employee {
//!    id: "emp_1234".into(),
//!    name: "Conrad".into(),
//!    joined: 1626900000,
//!    left: None,
//! };
//! // Put the new employee item into the db
//! client.put(new_employee).execute().await?;
//!
//! let employees: Vec<EmployeeNameIndex> = client.query::<EmployeeNameIndex>()
//!    .name("John") // query the db for all employees named "John"
//!    .execute().await?;
//!
//! let employees: Vec<EmployeeNameIndex> = client.query::<EmployeeNameIndex>()
//!    .name("John") // query the db for all employees named "John"
//!    .joined().between(1626649200, 1626735600) // and who joined between 2021-07-19 and 2021-07-20
//!    .execute().await?;
//! ```

#![warn(clippy::pedantic)]
#![warn(clippy::nursery)]
#![deny(missing_docs)]

use std::convert::TryFrom;

use attr::field;
use proc_macro::TokenStream;
use syn::{parse_macro_input, parse_quote, spanned::Spanned, DeriveInput};

mod attr;
mod convert;
mod key;
mod query;
mod iter;

trait Builder {
    fn parse(vis: syn::Visibility, name: syn::Ident, generics: syn::Generics, attrs: Vec<syn::Attribute>, fields: syn::FieldsNamed) -> syn::Result<proc_macro2::TokenStream>;
}

fn derive<P: Builder>(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let span = input.span();
    let DeriveInput { attrs, vis, ident, generics, data } = input;

    match data {
        syn::Data::Struct(s) => match s.fields {
            syn::Fields::Named(fields) => match P::parse(vis, ident, generics, attrs, fields) {
                Ok(t) => t,
                Err(e) => e.to_compile_error(),
            },
            syn::Fields::Unnamed(_) => syn::Error::new(span, "tuple structs not supported").into_compile_error(),
            syn::Fields::Unit => syn::Error::new(span, "unit structs not supported").into_compile_error(),
        },
        syn::Data::Enum(_) => syn::Error::new(span, "enums not supported").into_compile_error(),
        syn::Data::Union(_) => syn::Error::new(span, "unions not supported").into_compile_error(),
    }
    .into()
}

/// Implement a strongly typed key builder. This is used to setup get requests
#[proc_macro_derive(Key, attributes(nitro))]
pub fn derive_key(input: TokenStream) -> TokenStream {
    derive::<key::Builder>(input)
}

/// Implement a strongly typed query builder. This is used to setup query requests
#[proc_macro_derive(Query, attributes(nitro))]
pub fn derive_query(input: TokenStream) -> TokenStream {
    derive::<query::Builder>(input)
}

/// Implement `Into<Attributes>` and `TryFrom<Attributes>`
#[proc_macro_derive(Attributes, attributes(nitro))]
pub fn derive_convert(input: TokenStream) -> TokenStream {
    derive::<convert::Builder>(input)
}

#[derive(Clone, Copy)]
struct D;
impl From<D> for syn::Ident {
    fn from(_: D) -> Self {
        parse_quote!(__NitroglycerinDynamoDBClient)
    }
}
impl quote::ToTokens for D {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        syn::Ident::from(*self).to_tokens(tokens);
    }
}

#[derive(Clone, Copy)]
struct DL;
impl From<DL> for syn::Lifetime {
    fn from(_: DL) -> Self {
        parse_quote!('__nitroglycerin_dynamo_db_dlient)
    }
}
impl quote::ToTokens for DL {
    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
        syn::Lifetime::from(*self).to_tokens(tokens);
    }
}

#[derive(Clone)]
struct NamedField {
    pub attrs: field::Attr,
    pub name: syn::Ident,
    pub ty: syn::Type,
}

impl TryFrom<syn::Field> for NamedField {
    type Error = syn::Error;
    fn try_from(field: syn::Field) -> syn::Result<Self> {
        let syn::Field { ident, attrs, ty, .. } = field;
        let attrs = field::Attr::parse_attrs(attrs)?;
        Ok(Self { attrs, name: ident.unwrap(), ty })
    }
}

#[derive(Clone)]
struct Column {
    pub ident: syn::Ident,
    pub name: String,
    pub ty: syn::Type,
    pub with: Option<syn::Path>,
}

impl From<NamedField> for Column {
    fn from(f: NamedField) -> Self {
        Self {
            name: f.attrs.rename.as_ref().map_or_else(|| f.name.to_string(), syn::LitStr::value),
            ident: f.name,
            ty: f.ty,
            with: f.attrs.with,
        }
    }
}