Rust macro for defining DynamoDB items

01_Readme.md

This is a Rust macro for defining DynamoDB items for use with rusoto_dynamodb. It also requires that the hashmap! macro from the maplit crate be in scope.

02_macro.rs

#[macro_use] extern crate maplit;
use std::collections::HashMap;

macro_rules! ddb_item {
    ($($p:tt: $t:tt => $x:expr),*) => {
        hashmap!{
            $(
                String::from(stringify!($p)) => AttributeValue {
                    $t: Some($x),
                    ..Default::default()
                },
            )*
        }
    }
}

03_example.rs

#[macro_use] extern crate maplit;
extern crate rusoto_core;
extern crate rusoto_dynamodb;
extern crate uuid;

use std::default::Default;
use uuid::Uuid;

use rusoto_core::{default_tls_client, DefaultCredentialsProvider, Region};
use rusoto_dynamodb::{DynamoDb, DynamoDbClient, PutItemInput, AttributeValue};

macro_rules! ddb_item {
    ($($p:tt: $t:tt => $x:expr),*) => {
        hashmap!{
            $(
                String::from(stringify!($p)) => AttributeValue {
                    $t: Some($x),
                    ..Default::default()
                },
            )*
        }
    }
}

fn main() {
  let credentials = DefaultCredentialsProvider::new().unwrap();
  let client = DynamoDbClient::new(default_tls_client().unwrap(), credentials, Region::SaEast1);

  let entry_id = Uuid::new_v4();

  let query_params = PutItemInput {
      table_name: String::from("TABLE NAME"),
      item: ddb_item!{
          Id: s => format!("{}", entry_id),
          Status: s => String::from("some status")
      },
      ..Default::default()
  };

  match client.put_item(&query_params) {
    Ok(_) => {
        println!("Successfully created entry")
    }
    Err(error) => {
      println!("Error: {:?}", error);
    }
  }
}