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Removes host-specific types (#347)

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This converges host-defined modules with Wasm defined modules by
introducing a custom section for host-defined functions. The net result
are far less types and consistent initialization.

* HostModule is removed for Module
* HostFunction is removed for Function
* ModuleContext is removed for Module

Note: One impact of this is that the low-level API no longer accepts a
go context (context.Context), rather a `wasm.Module` which the function
is called in context of. This meant exposing `wasm.Module.WithContext`
to override the default.

Signed-off-by: Adrian Cole <adrian@tetrate.io>
This commit is contained in:
Crypt Keeper
2022-03-08 16:43:13 +08:00
committed by GitHub
parent ea91be49eb
commit 1e4834612a
45 changed files with 1538 additions and 1348 deletions
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12
examples/wasi_test.go
View File

@@ -14,12 +14,12 @@ import (
func Test_WASI(t *testing.T) {
// built-in WASI function to write a random value to memory
randomGet := func(ctx wasm.ModuleContext, buf, bufLen uint32) wasi.Errno {
randomGet := func(ctx wasm.Module, buf, bufLen uint32) wasi.Errno {
panic("unimplemented")
}
stdout := new(bytes.Buffer)
goFunc := func(ctx wasm.ModuleContext) {
goFunc := func(ctx wasm.Module) {
// Write 8 random bytes to memory using WASI.
errno := randomGet(ctx, 0, 8)
require.Equal(t, wasi.ErrnoSuccess, errno)
@@ -34,15 +34,15 @@ func Test_WASI(t *testing.T) {
// Host functions can be exported as any module name, including the empty string.
env := &wazero.HostModuleConfig{Name: "", Functions: map[string]interface{}{"random": goFunc}}
_, err := r.NewHostModule(env)
_, err := r.NewHostModuleFromConfig(env)
// Configure WASI and implement the function to use it
we, err := r.NewHostModule(wazero.WASISnapshotPreview1())
we, err := r.NewHostModuleFromConfig(wazero.WASISnapshotPreview1())
require.NoError(t, err)
randomGetFn := we.Function("random_get")
randomGetFn := we.ExportedFunction("random_get")
// Implement the function pointer. This mainly shows how you can decouple a host function dependency.
randomGet = func(ctx wasm.ModuleContext, buf, bufLen uint32) wasi.Errno {
randomGet = func(ctx wasm.Module, buf, bufLen uint32) wasi.Errno {
res, err := randomGetFn.Call(ctx, uint64(buf), uint64(bufLen))
require.NoError(t, err)
return wasi.Errno(res[0])