How to import shuffle or thread_rng from rand crate?

[freedeaths]

Purpose

I want to give an API of shuffling a vector/list from wasm. The example from wasmer-python readme.md and py.test tests/test_wasi.py work both, but the example shown below doesn't work. I'm confused about how to fix it. Is there anyone who can give a hand? TIA

Minimal reproduce

• Error msg:

Traceback (most recent call last):
  File "demo.py", line 12, in <module>
    instance = Instance(module)
RuntimeError: Error while importing "wasi_snapshot_preview1"."random_get": unknown import. Expected Function(FunctionType { params: [I32, I32], results: [I32] })

• API:

use rand::thread_rng;

#[no_mangle]
pub extern "C" fn add_random(a: i32) -> i32 {
    let mut rng = thread_rng();
    //let mut list = vec![1,2,3,4,5,6,7,8];
    //list.shuffle(&mut rng);
    //a + list[0]
}

• Cargo.toml

[lib]
crate-type = ['cdylib']

[dependencies]
rand = {version="0.7", features=["getrandom"]}
#rand = "0.8"
#getrandom = {version = "0.2", features = ["js"]}

• demo.py

from wasmer import engine, Store, Module, Instance
from wasmer_compiler_cranelift import Compiler

# Let's define the store, that holds the engine, that holds the compiler.
store = Store(engine.JIT(Compiler))

# Let's compile the module to be able to execute it!
module = Module(store, open('adder/target/wasm32-wasi/release/adder.wasm', 'rb').read())

# Now the module is compiled, we can instantiate it.
instance = Instance(module)

# Call the exported `sum` function.
result = instance.exports.add_random(5)

print(result)

Environments

• macOS, Intel x64
• Python 3.8.9
• Rustc 1.56.1
• wasmer==1.1.0
• wasmer_compiler_cranelift==1.1.0

Additional information

1. After cargo clean, it cannot be compiled. seems a bug issue from getrandom and a pr from wasi
2. Wasmtime runtime and wasmtime-python work both. but wasmer and wasmer-python doesn't work.

[josephlr]

wasi 0.10.3 has been yanked, so running cargo update (or the equivalent) should fix your issue.