37 lines
964 B
Markdown
37 lines
964 B
Markdown
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Retry an async function which takes `&mut self` as receiver.
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This is a bit more complex since we need to capture the receiver in the closure with ownership. backon supports this use case by `RetryableWithContext`.
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```rust
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use anyhow::Result;
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use backon::ExponentialBuilder;
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use backon::RetryableWithContext;
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struct Test;
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impl Test {
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async fn fetch(&mut self, url: &str) -> Result<String> {
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Ok(reqwest::get(url).await?.text().await?)
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}
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}
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#[tokio::main(flavor = "current_thread")]
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async fn main() -> Result<()> {
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let test = Test;
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let (_, result) = (|mut v: Test| async {
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let res = v.fetch("https://www.rust-lang.org").await;
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// Return input context back.
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(v, res)
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})
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.retry(ExponentialBuilder::default())
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// Passing context in.
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.context(test)
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.when(|e| e.to_string() == "retryable")
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.await;
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println!("fetch succeeded: {}", result.unwrap());
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Ok(())
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}
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```
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