add Func::ready_to_call and use it in wasmtime_wasi_http::handler#13683
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dicej wants to merge 1 commit into
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add Func::ready_to_call and use it in wasmtime_wasi_http::handler#13683dicej wants to merge 1 commit into
Func::ready_to_call and use it in wasmtime_wasi_http::handler#13683dicej wants to merge 1 commit into
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This allows the caller to wait for the underlying component instance to be ready to call, i.e. for any outstanding sync calls to finish and for backpressure to be disabled, if applicable. This is particularly useful in `wasmtime_wasi_http::handler` where we need to decide whether a given worker is available to handle additional requests. Previously, that decision did not take backpressure into account, meaning the worker would continue to accept requests even when the guest had enabled backpressure. However, a worker whose guest has enabled backpressure should _not_ accept new requests; instead, it should mark itself unavailable and allow another worker to accept them.
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I'm planning to add a test for this tomorrow; leaving as a draft until then. |
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This allows the caller to wait for the underlying component instance to be ready to call, i.e. for any outstanding sync calls to finish and for backpressure to be disabled, if applicable.
This is particularly useful in
wasmtime_wasi_http::handlerwhere we need to decide whether a given worker is available to handle additional requests. Previously, that decision did not take backpressure into account, meaning the worker would continue to accept requests even when the guest had enabled backpressure. However, a worker whose guest has enabled backpressure should not accept new requests; instead, it should mark itself unavailable and allow another worker to accept them.