Compile Error with Tokio and Actix-Web in Rust

[watchdogbro]

I'm encountering a compile error when trying to combine Tokio and Actix-Web in my Rust project. The error seems to be related to async context and lifetime issues.

Details:

Setup:

cargo --version

cargo 1.68.0 (ec4fa3db5 2023-03-09)

rustc --version

rustc 1.68.0 (2c8cc3432 2023-03-09)

Cargo.toml dependencies:

actix-web = "4"
tokio = { version = "1", features = ["full"] }

Encountered compile error:

cargo build

error[E0759]: self has an anonymous lifetime '_ but it needs to satisfy a 'static lifetime requirement
--> src/main.rs:20:10
|
20 | tokio::spawn(async move {
| ^^^^^^^
|
note: lifetime annotations needed
--> src/main.rs:18:31
|
18 | async fn handle_request(self) -> Result<HttpResponse, Error> {
| ^^^^

How can I resolve this lifetime issue and correctly use Tokio with Actix-Web?

[vikasmishra-dev]

This error usually occurs when you're trying to capture self in an async block that's spawned by Tokio. The problem is that Tokio's spawn requires a 'static lifetime, meaning the spawned task must outlive the current scope.

Try changing your handle_request method to take self by reference or use Arc<Mutex<Self>> if you need to share mutable state.

Example (using a reference):

async fn handle_request(&self) -> Result<HttpResponse, Error> {
    // ... your code ...
}

// In main:
tokio::spawn(async {
    // ... call handle_request using a reference to your struct ...
});

[vikasmishra-dev]

Cound be one of the above
not sure

[pranjalpruthi]

oh Webtix support is down

[vikasmishra-dev]

😂do all in go

[pranjalpruthi]

Another common cause for this error is that you are using a non-static closure inside the tokio::spawn.

Try using a move closure, and make sure that all captured variables are owned by the closure.

```rust
tokio::spawn(async move {
    let owned_data = your_data.clone(); // Clone if needed
    // ... use owned_data ...
});

[vikasmishra-dev]

better aysnc approach ⚡

[maria-sonnet]

The error is related to how Actix-Web's `self` lifetime interacts with Tokio's `spawn`. Actix-Web's handlers often have lifetimes that are tied to the request, which are not `'static`.

The best approach is to extract the necessary data from `self` and move it into the Tokio task.

```rust
async fn handle_request(self) -> Result<HttpResponse, Error> {
    let data = self.extract_data(); // Extract relevant data
    tokio::spawn(async move {
        // ... use data ...
    });
    // ... rest of handler ...
}

[watchdogbro]

sure that work

[vikasmishra-dev]

nvm go with aysnc approach ⚡