32 lines
936 B
Go
32 lines
936 B
Go
package gojs
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import (
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"context"
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"github.com/tetratelabs/wazero/api"
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"github.com/tetratelabs/wazero/internal/gojs/custom"
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"github.com/tetratelabs/wazero/internal/gojs/goos"
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"github.com/tetratelabs/wazero/internal/wasm"
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)
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// jsCrypto is used by crypto/rand.Read to gets random values.
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//
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// It has only one invocation pattern:
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//
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// jsCrypto.Call("getRandomValues", a /* uint8Array */)
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//
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// This is defined as `Get("crypto")` in rand_js.go init
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var jsCrypto = newJsVal(goos.RefJsCrypto, custom.NameCrypto).
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addFunction(custom.NameCryptoGetRandomValues, cryptoGetRandomValues{})
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// cryptoGetRandomValues implements jsFn
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type cryptoGetRandomValues struct{}
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func (cryptoGetRandomValues) invoke(_ context.Context, mod api.Module, args ...interface{}) (interface{}, error) {
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randSource := mod.(*wasm.ModuleInstance).Sys.RandSource()
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r := args[0].(*goos.ByteArray)
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n, err := randSource.Read(r.Unwrap())
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return uint32(n), err
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}
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