func (lua *LuaExt) exec(reqLogger log.Logger, app *LuaApp, appID, reqId, script string, w http.ResponseWriter, r *http.Request) int {
// FIXME(tsileo) a debug mode, with a defer/recover
// also parse the Lu error and show the bugging line!
start := time.Now()
httpClient := &http.Client{}
// Initialize internal Lua module written in Go
logger := loggerModule.New(reqLogger.New("ctx", "Lua"), start, reqId)
response := responseModule.New()
request := requestModule.New(r, reqId, lua.authFunc)
blobstore := blobstoreModule.New(lua.blobStore)
kvstore := kvstoreModule.New(lua.kvStore)
bewit := bewitModule.New(reqLogger.New("ctx", "Lua bewit module"), r)
template := templateModule.New()
// Initialize Lua state
L := luamod.NewState()
defer L.Close()
setCustomGlobals(L)
L.PreloadModule("request", request.Loader)
L.PreloadModule("response", response.Loader)
L.PreloadModule("logger", logger.Loader)
L.PreloadModule("blobstore", blobstore.Loader)
L.PreloadModule("kvstore", kvstore.Loader)
L.PreloadModule("bewit", bewit.Loader)
L.PreloadModule("template", template.Loader)
// TODO(tsileo) docstore module
// TODO(tsileo) cookies module
// TODO(tsileo) lru module
// TODO(tsileo) cache module => to cache response
// TODO(tsileo) load module from github directly?
// TODO(tsileo) ETag support
// 3rd party module
luajson.Preload(L)
L.PreloadModule("http", gluahttp.NewHttpModule(httpClient).Loader)
// Set some global variables
L.SetGlobal("reqID", luamod.LString(reqId))
L.SetGlobal("appID", luamod.LString(appID))
// Execute the code
if err := L.DoString(script); err != nil {
// FIXME better error, with debug mode?
panic(err)
}
// Apply the Response object to the actual response
response.WriteTo(w)
// TODO save the logRecords in the AppStats and find a way to serve them over Server-Sent Events
// keep them in memory with the ability to dump them in bulk as blob for later query
// logRecords := logger.Records()
for _, logRecord := range logger.Records() {
app.logs = append(app.logs, logRecord)
}
reqLogger.Info("Script executed", "response", response, "duration", time.Since(start))
return response.Status()
}
func setCustomGlobals(L *luamod.LState) {
// Return the server unix timestamp
L.SetGlobal("unix", L.NewFunction(func(L *luamod.LState) int {
L.Push(luamod.LNumber(time.Now().Unix()))
return 1
}))
// Generate a random hexadecimal ID with the current timestamp as first 4 bytes,
// this means keys will be sorted by creation date automatically if sorted lexicographically
L.SetGlobal("hexid", L.NewFunction(func(L *luamod.LState) int {
id, err := hexid.New(int(time.Now().UTC().Unix()))
if err != nil {
panic(err)
}
L.Push(luamod.LString(id.String()))
return 1
}))
// Compute the Blake2B hash for the given string
L.SetGlobal("blake2b", L.NewFunction(func(L *luamod.LState) int {
hash := fmt.Sprintf("%x", blake2b.Sum256([]byte(L.ToString(1))))
L.Push(luamod.LString(hash))
return 1
}))
// Sleep for the given number of seconds
L.SetGlobal("sleep", L.NewFunction(func(L *luamod.LState) int {
time.Sleep(time.Duration(float64(L.ToNumber(1)) * float64(1e9)))
return 0
}))
// Convert the given Markdown to HTML
L.SetGlobal("markdownify", L.NewFunction(func(L *luamod.LState) int {
output := blackfriday.MarkdownCommon([]byte(L.ToString(1)))
L.Push(luamod.LString(string(output)))
return 1
}))
// Render execute a Go HTML template, data must be a table with string keys
L.SetGlobal("render", L.NewFunction(func(L *luamod.LState) int {
tplString := L.ToString(1)
data := luautil.TableToMap(L.ToTable(2))
tpl, err := template.New("tpl").Parse(tplString)
if err != nil {
L.Push(luamod.LString(err.Error()))
return 1
}
// TODO(tsileo) add some templatFuncs/template filter
out := &bytes.Buffer{}
if err := tpl.Execute(out, data); err != nil {
L.Push(luamod.LString(err.Error()))
return 1
}
L.Push(luamod.LString(out.String()))
return 1
}))
// TODO(tsileo) a urljoin?
// Return an absoulte URL for the given path
L.SetGlobal("url", L.NewFunction(func(L *luamod.LState) int {
// FIXME(tsileo) take the host from the req?
L.Push(luamod.LString("http://localhost:8050" + L.ToString(1)))
return 1
}))
}