January 2019
Intermediate to advanced
520 pages
14h 32m
English
Content preview from Hands-On Microservices with Rust
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Accessing a shared state from a service function
To get access to a shared state, you need to provide a reference to the shared data. This is simple, because we've already wrapped our state with Arc, which provides us with a clone() function to duplicate the reference to the shared object.
Since our service function needs extra parameters, we have to rewrite the definition and call our microservice_handler function. Now it has an extra argument, which is the reference to the shared state:
fn microservice_handler(req: Request<Body>, user_db: &UserDb) -> impl Future<Item=Response<Body>, Error=Error>
We also have to send this expected reference to the main function:
fn main() { let addr = ([127, 0, 0, 1], 8080).into(); let builder = Server::bind(&addr); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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