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b84637801a* pull in go-ffmpreg v0.6.0 * add code comment * grrr linter * set empty module name when calling ffmpeg / ffprobe
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package wasm
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import (
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"context"
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"io"
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"unsafe"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/sys"
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)
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// Args encompasses a common set of
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// configuration options often passed to
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// wazero.Runtime on module instantiation.
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type Args struct {
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// Program name, depending on the
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// module being run this may or may
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// not be necessary.
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Name string
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// Optional further module configuration function.
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// (e.g. to mount filesystem dir, set env vars, etc).
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Config func(wazero.ModuleConfig) wazero.ModuleConfig
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// Standard FDs.
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Stdin io.Reader
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Stdout io.Writer
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Stderr io.Writer
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// CLI args.
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Args []string
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}
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// Run will run given compiled WebAssembly module
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// within the given runtime, with given arguments.
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// Returns the exit code, or error.
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func Run(
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ctx context.Context,
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runtime wazero.Runtime,
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module wazero.CompiledModule,
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args Args,
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) (rc uint32, err error) {
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// Prefix arguments with module name.
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cargs := make([]string, len(args.Args)+1)
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cargs[0] = args.Name
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copy(cargs[1:], args.Args)
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// Prepare new module configuration.
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modcfg := wazero.NewModuleConfig()
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modcfg = modcfg.WithArgs(cargs...)
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modcfg = modcfg.WithStdin(args.Stdin)
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modcfg = modcfg.WithStdout(args.Stdout)
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modcfg = modcfg.WithStderr(args.Stderr)
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if args.Config != nil {
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// Pass through config fn.
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modcfg = args.Config(modcfg)
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}
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// Enable setjmp longjmp.
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ctx = withSetjmpLongjmp(ctx)
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// Instantiate the module from precompiled wasm module data.
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mod, err := runtime.InstantiateModule(ctx, module, modcfg)
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if !isNil(mod) {
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// Ensure closed.
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_ = mod.Close(ctx)
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}
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// Try extract exit code.
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switch err := err.(type) {
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case *sys.ExitError:
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return err.ExitCode(), nil
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default:
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return 0, err
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}
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}
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// isNil will safely check if 'v' is nil without
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// dealing with weird Go interface nil bullshit.
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func isNil(i interface{}) bool {
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type eface struct{ Type, Data unsafe.Pointer }
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return (*(*eface)(unsafe.Pointer(&i))).Data == nil
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}
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