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catdoc.go
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catdoc.go
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package gocatdoc
import (
"bytes"
"context"
"fmt"
"io"
"io/fs"
"strings"
"sync"
"embed"
"github.com/tetratelabs/wazero"
"github.com/tetratelabs/wazero/api"
"github.com/tetratelabs/wazero/imports/emscripten"
"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
"github.com/tetratelabs/wazero/sys"
)
//go:embed catdoc.wasm
var binary []byte
//go:embed charsets/*
var charsets embed.FS
var runtimeConfig wazero.RuntimeConfig
var r wazero.Runtime
var compiledModule wazero.CompiledModule
var ctx context.Context
var initLock = &sync.Mutex{}
func getWASMModuleWithFS(file fs.FS, stdout, stderr io.Writer) (api.Module, error) {
cMod, run, err := getCompiledWASMModule()
if err != nil {
return nil, err
}
mod, err := run.InstantiateModule(ctx, cMod, wazero.NewModuleConfig().
WithStartFunctions("_initialize").
WithFSConfig(
wazero.NewFSConfig().
WithFSMount(file, "/input_file/").
WithFSMount(charsets, "/")).
WithStdout(stdout).WithStderr(stderr))
return mod, err
}
func getCompiledWASMModule() (wazero.CompiledModule, wazero.Runtime, error) {
initLock.Lock()
defer initLock.Unlock()
if r == nil {
ctx = context.Background()
if runtimeConfig == nil {
cache := wazero.NewCompilationCache()
runtimeConfig = wazero.NewRuntimeConfig().WithCompilationCache(cache)
}
r = wazero.NewRuntimeWithConfig(ctx, runtimeConfig)
wasi_snapshot_preview1.MustInstantiate(ctx, r)
if compiledModule == nil {
module, err := r.CompileModule(ctx, binary)
compiledModule = module
if err != nil {
return nil, nil, fmt.Errorf("failed to compile module: %w", err)
}
}
_, err := emscripten.InstantiateForModule(ctx, r, compiledModule)
if err != nil {
return nil, nil, fmt.Errorf("failed to instantiate module (emscripten): %w", err)
}
}
return compiledModule, r, nil
}
func GetAuthorFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_author", file)
}
func GetLastAuthorFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_last_author", file)
}
func GetTextFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_text", file)
}
func GetTitleFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_title", file)
}
func GetSubjectFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_subject", file)
}
func GetKeywordsFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_keywords", file)
}
func GetCommentsFromFile(file io.ReadSeeker) (string, error) {
return callWASMFuncWithFile("get_comments", file)
}
func GetAnnotationAuthorsFromFile(file io.ReadSeeker) ([]string, error) {
r, err := callWASMFuncWithFile("get_annotation_authors", file)
if err != nil {
return nil, err
}
return strings.Split(r, "\n"), nil
}
func GetVersion() (string, error) {
return callWASMFunc("get_version", nil)
}
func callWASMFuncWithFile(funcName string, file io.ReadSeeker) (string, error) {
fileFS, err := newFakeFS(file)
if err != nil {
return "", err
}
return callWASMFunc(funcName, fileFS)
}
func callWASMFunc(funcName string, fs fs.FS) (string, error) {
outBuf := &bytes.Buffer{}
errBuf := &bytes.Buffer{}
mod, err := getWASMModuleWithFS(fs, outBuf, errBuf)
if err != nil {
return "", fmt.Errorf("could not get wasm module: %w", err)
}
_, err = mod.ExportedFunction(funcName).Call(ctx)
if err != nil {
if exitError, ok := err.(*sys.ExitError); ok && exitError.ExitCode() != 0 {
return "", fmt.Errorf("%s %w", errBuf.String(), exitError)
}
}
outStr := outBuf.String()
errStr := errBuf.String()
outStr = strings.TrimRight(outStr, "\n")
errStr = strings.TrimRight(errStr, "\n")
err = nil
if errStr != "" {
err = fmt.Errorf(errStr)
}
return outStr, err
}