An asynchronous runtime compatible with WebAssembly and non-WebAssembly targets.

Related tags

Learning Resources prokio
Overview

Promise x Tokio = Prokio

An asynchronous runtime compatible with WebAssembly and non-WebAssembly targets.

Rationale

When designing components and libraries that works on both WebAssembly targets backed by JavaScript Runtime and non-WebAssembly targets with Native Runtimes. Developers usually face challenges that requires applying multiple feature flags throughout their application:

  1. Select I/O and timers that works with the target runtime.
  2. Native Runtimes usually require Send futures and WebAssembly types are usually !Send.

Implementation

To alleviate these issues, Prokio implements a single-threaded runtime that executes ?Send (Send or !Send) futures.

On platforms with multi-threading support, prokio spawns multiple independent runtimes proportional to the CPU core number. When tasks are spawned with a runtime handle, it will randomly select a worker thread from the internal pool. All tasks spawned with spawn_local will run on the same thread as the thread the task was running. When the runtime runs in a WebAssembly target, all tasks will be scheduled on the main thread.

This runtime is designed in favour of IO-bounded workload with similar runtime cost. When running I/O workloads, it would produce a slightly better performance as tasks are never moved to another thread. However, If a worker thread is busy, other threads will not be able to steal tasks scheduled on the busy thread. When you have a CPU-bounded task where CPU time is significantly more expensive, it should be spawned with a dedicated thread (or Web Worker) and communicates with the application using channels.

Prokio provides the following components:

  1. A Task Scheduler that is capable of running non-Send tasks.
  2. A Timer that is compatible with the scheduler backend.
  3. Task Synchronisation Mechanisms.

Runtime Backend

Prokio runtime is implemented with different runtimes depending on the target platform and can use all features (timers / IO / task synchronisation) from the selected native runtime:

  • wasm-bindgen-futures (WebAssembly targets)
  • tokio (non-WebAssembly targets)
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Comments
  • Bump Swatinem/rust-cache from 1 to 2

    Bump Swatinem/rust-cache from 1 to 2

    Bumps Swatinem/rust-cache from 1 to 2.

    Release notes

    Sourced from Swatinem/rust-cache's releases.

    v2.0.0

    • The action code was refactored to allow for caching multiple workspaces and different target directory layouts.
    • The working-directory and target-dir input options were replaced by a single workspaces option that has the form of $workspace -> $target.
    • Support for considering env-vars as part of the cache key.
    • The sharedKey input option was renamed to shared-key for consistency.

    v1.4.0

    • Clean both debug and release target directories.

    v1.3.0

    • Use Rust toolchain file as additional cache key.
    • Allow for a configurable target-dir.

    v1.2.0

    • Cache ~/.cargo/bin.
    • Support for custom $CARGO_HOME.
    • Add a cache-hit output.
    • Add a new sharedKey option that overrides the automatic job-name based key.

    v1.1.0

    • Add a new working-directory input.
    • Support caching git dependencies.
    • Lots of other improvements.

    v1.0.1

    • Improved logging output.
    • Make sure to consider all-features dependencies when pruning.
    • Work around macOS cache corruption.
    • Remove git-db cache for now.
    Changelog

    Sourced from Swatinem/rust-cache's changelog.

    Changelog

    2.2.0

    • Add new save-if option to always restore, but only conditionally save the cache.

    2.1.0

    • Only hash Cargo.{lock,toml} files in the configured workspace directories.

    2.0.2

    • Avoid calling cargo metadata on pre-cleanup.
    • Added prefix-key, cache-directories and cache-targets options.

    2.0.1

    • Primarily just updating dependencies to fix GitHub deprecation notices.

    2.0.0

    • The action code was refactored to allow for caching multiple workspaces and different target directory layouts.
    • The working-directory and target-dir input options were replaced by a single workspaces option that has the form of $workspace -> $target.
    • Support for considering env-vars as part of the cache key.
    • The sharedKey input option was renamed to shared-key for consistency.

    1.4.0

    • Clean both debug and release target directories.

    1.3.0

    • Use Rust toolchain file as additional cache key.
    • Allow for a configurable target-dir.

    1.2.0

    • Cache ~/.cargo/bin.
    • Support for custom $CARGO_HOME.
    • Add a cache-hit output.
    • Add a new sharedKey option that overrides the automatic job-name based key.

    1.1.0

    • Add a new working-directory input.
    • Support caching git dependencies.
    • Lots of other improvements.

    ... (truncated)

    Commits

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    dependencies github_actions 
    opened by dependabot[bot] 0
  • Provide IO types

    Provide IO types

    tokio provides the following IO types:

    1. Standard Input / Output
    2. TCP / UDP / Unix Sockets
    3. Named Pipes (Windows)

    Whilst we cannot provide these traditional IO types when running in browsers, we can provide some other IO types:

    1. HTTP
    2. WebSockets
    3. WebRTC
    feature-request 
    opened by futursolo 0
  • Enable prokio for wasm32-wasi (wasm-bindgen-futures)

    Enable prokio for wasm32-wasi (wasm-bindgen-futures)

    This issue tracks the missing upstream support to land wasi support for Prokio Runtime with wasm-bindgen-futures backend:

    • [ ] wasm-bindgen supports wasm32-wasi.
    blocked feature-request 
    opened by futursolo 0
  • Enable prokio for wasm32-wasi (tokio)

    Enable prokio for wasm32-wasi (tokio)

    Tokio has just landed support for wasm32-wasi. However, wasi misses some essential features for Yew Runtime to become useful under wasi.

    wasi can be used for:

    • Client-Side Rendering (wasi in Browser)
    • Server-Side Rendering (wasi in JavaScript-capable WebAssembly Runtime & Standalone WebAssembly Runtime)
    • Static-Site Generation (wasi in JavaScript-capable WebAssembly Runtime & Standalone WebAssembly Runtime)

    This issue tracks the tokio features required to land wasi support for Yew Runtime:

    • [ ] wasi target currently lacks networking capability in general. (needed for CSR and SSR.) This is primarily due to sockets under wasi is not standardised. There is an alternative proposal for an HTTP interface.
    • [ ] tokio::fs for wasi. (needed for SSG and potentially SSR.)

    There are some other features that might be desirable before we start to implement the target:

    • [ ] multi-threading support so multiple CPU cores can be utilised.
    blocked feature-request 
    opened by futursolo 1
Releases(v0.1.0)
Owner
Yew Stack
UI for Rust
Yew Stack
GitHub
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