93 lines
1.7 KiB
Go
93 lines
1.7 KiB
Go
package main
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import (
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gcontext "context"
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"os"
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"reflect"
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"github.com/Xe/ln"
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"github.com/Xe/uuid"
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"github.com/go-interpreter/wagon/exec"
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"github.com/go-interpreter/wagon/validate"
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"github.com/go-interpreter/wagon/wasm"
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)
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type Process struct {
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id string
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vm *exec.VM
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}
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func NewProcess(vm *exec.VM) *Process {
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p := &Process{
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id: uuid.New(),
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vm: vm,
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}
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return p
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}
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func (p Process) importer(name string) (*wasm.Module, error) {
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switch name {
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case "env":
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m := wasm.NewModule()
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m.Types = &wasm.SectionTypes{
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Entries: []wasm.FunctionSig{
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{
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Form: 0,
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ParamTypes: []wasm.ValueType{wasm.ValueTypeI32, wasm.ValueTypeI32},
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ReturnTypes: []wasm.ValueType{wasm.ValueTypeI32},
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},
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},
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}
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m.FunctionIndexSpace = []wasm.Function{
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{
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Sig: &m.Types.Entries[0],
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Host: reflect.ValueOf(p.log),
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Body: &wasm.FunctionBody{},
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},
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}
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m.Export = &wasm.SectionExports{
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Entries: map[string]wasm.ExportEntry{
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"log": {
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FieldStr: "log",
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Kind: wasm.ExternalFunction,
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Index: 0,
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},
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},
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}
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return m, nil
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default:
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f, err := os.Open(name + ".wasm")
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if err != nil {
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return nil, err
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}
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defer f.Close()
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m, err := wasm.ReadModule(f, nil)
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if err != nil {
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return nil, err
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}
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err = validate.VerifyModule(m)
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if err != nil {
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return nil, err
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}
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return m, nil
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}
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}
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// ID returns the process ID string.
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func (p Process) ID() string { return p.id }
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// VM returns the webassembly VM used to execute code. This isn't thread-safe.
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func (p Process) VM() *exec.VM { return p.vm }
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func (p *Process) log(ptr int32, len int32) int32 {
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data := p.vm.Memory()[ptr : ptr+len]
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ln.Log(gcontext.Background(), ln.F{"data": data, "data_string": string(data), "pid": p.id})
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return 0
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}
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