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Merge pull request #106 from Peefy/feat-kcl-go-wasm-lib-example
feat: add kcl-go wasm lib example
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module github.com/kcl-lang/wasm-lib | ||
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go 1.22.1 | ||
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require github.com/bytecodealliance/wasmtime-go/v22 v22.0.1 |
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github.com/bytecodealliance/wasmtime-go/v22 v22.0.1 h1:/wWcvXyffeWeDQQte3Db/fHVEov8HhxfVJ43gz9xVcM= | ||
github.com/bytecodealliance/wasmtime-go/v22 v22.0.1/go.mod h1:knqkvjTLavLtAXnA5NJUM0qbRiPJCVWPLXfYu75kZSo= | ||
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= | ||
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | ||
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= | ||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= | ||
github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk= | ||
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU= | ||
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= | ||
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= |
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package main | ||
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import ( | ||
"fmt" | ||
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"github.com/kcl-lang/wasm-lib/pkg/module" | ||
) | ||
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func main() { | ||
m, err := module.New("../../kcl.wasm") | ||
if err != nil { | ||
panic(err) | ||
} | ||
result, err := m.Run(&module.RunOptions{ | ||
Filename: "test.k", | ||
Source: "a = 1", | ||
}) | ||
if err != nil { | ||
panic(err) | ||
} | ||
fmt.Println(result) | ||
} |
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package module | ||
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import ( | ||
"fmt" | ||
"log" | ||
"os" | ||
"path/filepath" | ||
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"github.com/bytecodealliance/wasmtime-go/v22" | ||
) | ||
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type RunOptions struct { | ||
Filename string | ||
Source string | ||
} | ||
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type KCLModule struct { | ||
Instance *wasmtime.Instance | ||
Store *wasmtime.Store | ||
Memory *wasmtime.Memory | ||
KclMalloc *wasmtime.Func | ||
KclFree *wasmtime.Func | ||
KclRun *wasmtime.Func | ||
} | ||
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func New(path string) (*KCLModule, error) { | ||
dir, err := os.MkdirTemp("", "out") | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
defer os.RemoveAll(dir) | ||
stdoutPath := filepath.Join(dir, "stdout") | ||
engine := wasmtime.NewEngine() | ||
module, err := wasmtime.NewModuleFromFile(engine, path) | ||
if err != nil { | ||
return nil, err | ||
} | ||
linker := wasmtime.NewLinker(engine) | ||
err = linker.DefineWasi() | ||
linker.FuncWrap("env", "kclvm_plugin_invoke_json_wasm", func(_name int32, _args int32, _kwargs int32) int32 { | ||
return 0 | ||
}) | ||
if err != nil { | ||
return nil, err | ||
} | ||
wasiConfig := wasmtime.NewWasiConfig() | ||
wasiConfig.SetStdoutFile(stdoutPath) | ||
store := wasmtime.NewStore(engine) | ||
store.SetWasi(wasiConfig) | ||
instance, err := linker.Instantiate(store, module) | ||
if err != nil { | ||
return nil, err | ||
} | ||
memory := instance.Exports(store)[0].Memory() | ||
malloc := instance.GetFunc(store, "kcl_malloc") | ||
free := instance.GetFunc(store, "kcl_free") | ||
run := instance.GetFunc(store, "kcl_run") | ||
return &KCLModule{ | ||
Instance: instance, | ||
Store: store, | ||
Memory: memory, | ||
KclMalloc: malloc, | ||
KclFree: free, | ||
KclRun: run, | ||
}, nil | ||
} | ||
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func (m *KCLModule) Run(opts *RunOptions) (string, error) { | ||
filenamePtr, filenameLen, err := copyStringToWasmMemory(m.Store, m.KclMalloc, m.Memory, opts.Filename) | ||
if err != nil { | ||
return "", err | ||
} | ||
defer func() { | ||
err := freeMemory(m.Store, m.KclFree, filenamePtr, filenameLen) | ||
if err != nil { | ||
fmt.Println("Failed to free filename memory:", err) | ||
} | ||
}() | ||
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sourcePtr, sourceLen, err := copyStringToWasmMemory(m.Store, m.KclMalloc, m.Memory, opts.Source) | ||
if err != nil { | ||
return "", err | ||
} | ||
defer func() { | ||
err := freeMemory(m.Store, m.KclFree, sourcePtr, sourceLen) | ||
if err != nil { | ||
fmt.Println("Failed to free source memory:", err) | ||
} | ||
}() | ||
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resultPtr, err := m.KclRun.Call(m.Store, filenamePtr, sourcePtr) | ||
if err != nil { | ||
return "", err | ||
} | ||
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result, _, err := copyCStrFromWasmMemory(m.Store, m.Memory, resultPtr.(int32)) | ||
if err != nil { | ||
return "", err | ||
} | ||
defer func() { | ||
err := freeMemory(m.Store, m.KclFree, resultPtr.(int32), int32(len(result))) | ||
if err != nil { | ||
fmt.Println("Failed to free result memory:", err) | ||
} | ||
}() | ||
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return result, nil | ||
} |
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package module | ||
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import "github.com/bytecodealliance/wasmtime-go/v22" | ||
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func copyStringToWasmMemory( | ||
store *wasmtime.Store, | ||
malloc *wasmtime.Func, | ||
memory *wasmtime.Memory, | ||
str string, | ||
) (int32, int32, error) { | ||
bytes := []byte(str) | ||
length := len(bytes) | ||
ptr, err := malloc.Call(store, int32(length)) | ||
if err != nil { | ||
return 0, 0, err | ||
} | ||
data := memory.UnsafeData(store) | ||
idx := ptr.(int32) | ||
copy(data[idx:(int(idx)+length)], bytes) | ||
return idx, int32(length), nil | ||
} | ||
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func copyCStrFromWasmMemory( | ||
store *wasmtime.Store, | ||
memory *wasmtime.Memory, | ||
ptr int32, | ||
) (string, int32, error) { | ||
data := memory.UnsafeData(store) | ||
end := ptr | ||
for data[end] != 0 { | ||
end++ | ||
} | ||
result := string(data[ptr:end]) | ||
return result, end + 1 - ptr, nil | ||
} | ||
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func freeMemory( | ||
store *wasmtime.Store, | ||
free *wasmtime.Func, | ||
ptr int32, | ||
length int32, | ||
) error { | ||
_, err := free.Call(store, ptr, length) | ||
return err | ||
} |