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package markdown
import (
"bytes"
"context"
"expvar"
"io"
"math/rand"
"os"
"strconv"
"strings"
"time"
"github.com/tetratelabs/wazero"
"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
"tailscale.com/metrics"
"xeiaso.net/v4"
)
var (
r wazero.Runtime
code wazero.CompiledModule
conversionTimes = metrics.LabelMap{Label: "conversion_time"}
)
func init() {
ctx := context.Background()
r = wazero.NewRuntime(ctx)
wasi_snapshot_preview1.MustInstantiate(ctx, r)
wasmBytes, err := xeiaso.Bin.ReadFile("bin/xemd2html.wasm")
if err != nil {
panic(err)
}
code, err = r.CompileModule(ctx, wasmBytes)
if err != nil {
panic(err)
}
expvar.Publish("gauge_markdown_conversion_times", &conversionTimes)
}
func Render(ctx context.Context, fname string, fin io.Reader, logLevel string) (string, error) {
fout := &bytes.Buffer{}
name := "xemd2html-" + strconv.Itoa(rand.Int())
fs := wazero.NewFSConfig().WithFSMount(xeiaso.Data, "/")
config := wazero.NewModuleConfig().
WithArgs("xemd2html").
WithStdout(fout).
WithStderr(os.Stderr).
WithStdin(fin).
WithFSConfig(fs).
WithEnv("RUST_LOG", logLevel).
WithName(name)
t0 := time.Now()
mod, err := r.InstantiateModule(ctx, code, config)
if err != nil {
return "", err
}
defer mod.Close(ctx)
since := time.Since(t0)
conversionTimes.Add(fname, since.Nanoseconds())
return strings.TrimSpace(fout.String()), nil
}
|
