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asynchronousrustasync-awaittraits

Call async function in non-async for rustr

Hi I have a system which pulls some data from different sources. All sources until today were sync so i designed the following API:


trait GraphPuller {
  pub fn Graph() -> Result<Vec<i64>>
}

struct GitPuller;
Struct TcpPuller;

impl GraphPuller for GitPuller {
  pub fn Graph() -> Result<Vec<i64>> {
  ...
  }
}

impl GraphPuller for Tc[Puller {
  pub fn Graph() -> Result<Vec<i64>> {
  ...
  }
}

Now I have to implement the Puller for AWS. AWS API is async, so i have to call async function in non sync system.

How Should I design the trait and api to avoid issues?

Solution

  • The easiest way is to keep the trait the same and to just block on the Amazon API calls. I'd recommend pollster::block_on because it implements just the very minimum instead of pulling in the more heavyweight futures crate.