Attribute Macro bindings

#[bindings]

Automatically bind bindings in your wrangler.toml into a Rust struct

• This uses the default (top-level) env by default. You can configure it by passing an env name as argument like #[bindings(dev)]
• You can the bindings instance by ＜struct name＞::from(&env).

Example

---

wrangler.toml

[[kv_namespaces]]
binding = "MY_KV"
id      = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

---

lib.rs

use worker::*;
use worker_bindings::bindings;
 
#[bindings]
struct Bindings;
 
#[event(fetch)]
pub async fn main(req: Request, env: Env, _ctx: worker::Context) -> Result<Response> {
    let b = Bindings::from(&env);
 
    let data = b.MY_KV.get("data").text().await
        .expect("Failed to get data");
 
    //...
}

---

note : #[bindings] supports

• KV
• D1
• Vars
• Service
• Queue (producer)
• Durable Objects

in cuurent version, as worker crate does. ( worker supports secrets, but secrets aren’t written in wrangler.toml… )

tips :

• You can switch between multiple envs by feature flags like #[cfg_attr(feature = "...", bindings(env_name))]
• For rust-analyzer user : when editting wrangler.toml around bindings, you’ll need to reload #[bindings] struct ...; to notice the new bindings to rust-analyer. For that, what you have to do is just deleting ; and immediate restoring it.