Add services dynamically with tonic #886
Description
Feature Request
Hello 👋!
Thread from discord which motivated this issue creation: https://discord.com/channels/500028886025895936/628706823104626710/930507181516795944
Motivation
I want to dynamically add services where those services would be initialized later.
For instance, let's suppose we want a Builder pattern to create GRPC services based on a Shared Context where you could register your Service creation function.
struct GRPCDriver<C, Se>
where
C: BusinessContext + Send + Sync + 'static,
Se: Service<hyper::Request<Body>, Response = Response<BoxBody>>
+ NamedService
+ Clone
+ Send
+ 'static,
Se::Future: Send + 'static,
Se::Error: Into<TonicError> + Send,
{
// Here we have our "service factory" which create services based on a Shared Context
grpc_services: Vec<Box<dyn Fn(Arc<C>) -> Se + Send>>,
..
}
impl<C, Se> GRPCDriver<C, Se>
where
C: BusinessContext + Send + Sync + 'static,
Se: Service<Request<Body>, Response = Response<BoxBody>>
+ NamedService
+ Clone
+ Send
+ 'static,
Se::Future: Send + 'static,
Se::Error: Into<TonicError> + Send,
{
// Here the function which will run the server and services initialization.
async fn run_driver_without_context(self, context: Arc<C>) -> anyhow::Result<()> {
let grpc_services: Vec<Box<dyn Fn(Arc<C>) -> Se + Send>> = self.grpc_services;
let mut server = TonicServer::builder();
for service in grpc_services {
server = server.add_service(service(Arc::clone(&context)));
// Here types are fucked up because the compiler can't infer the right type for server.
}
server.await
}
}It won't work due to the typing of the successive add_service call.
Proposal
Not really :(