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server.go
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server.go
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package intranet
import (
"errors"
"net/http"
"os"
"strings"
"github.com/getblank/wango"
"github.com/go-chi/chi"
"golang.org/x/net/websocket"
"github.com/getblank/blank-router/berrors"
"github.com/getblank/blank-router/taskq"
"github.com/getblank/blank-sr/config"
"github.com/getblank/blank-sr/registry"
"github.com/getblank/blank-one/appconfig"
"github.com/getblank/blank-one/logging"
"github.com/getblank/blank-one/sessions"
"github.com/getblank/blank-one/sr"
)
const (
getTaskURI = "get"
doneTaskURI = "done"
errorTaskURI = "error"
publishURI = "publish"
cronRunURI = "cron.run"
uriSubStores = "com.stores"
rpcSessionNew = "session.new"
rpcSessionCheck = "session.check"
rpcSessionDelete = "session.delete"
rpcSessionUserUpdate = "session.user-update"
)
var (
wampServer = wango.New()
log = logging.Logger()
taskWatchChan = make(chan taskKeeper, 1000)
workerConnectChan = make(chan string)
workerDisconnectChan = make(chan string)
listeningPort = "2345"
)
type taskKeeper struct {
workerID string
taskID uint64
done bool
}
func taskGetHandler(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
log.Debugf("Get task request from client \"%s\"", c.ID())
t := taskq.Shift()
log.Debugf("Shifted task id: \"%d\" type: \"%s\" for client \"%s\"", t.ID, t.Type, c.ID())
if c.Connected() {
taskWatchChan <- taskKeeper{c.ID(), t.ID, false}
return t, nil
}
taskq.UnShift(t)
log.Debugf("Shifted task id: \"%d\" type: \"%s\" returned to the queue because client \"%s\" already disconnected", t.ID, t.Type, c.ID())
return nil, nil
}
func taskDoneHandler(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
if len(args) < 2 {
log.Warn("Invalid task.done RPC")
return nil, berrors.ErrInvalidArguments
}
id, ok := args[0].(float64)
if !ok {
log.Warnf("Invalid task.id %v in task.done RPC", args[0])
return nil, berrors.ErrInvalidArguments
}
log.Debugf("Task done id: \"%d\" from client \"%s\"", int(id), c.ID())
result := taskq.Result{
ID: uint64(id),
Result: args[1],
}
taskq.Done(result)
taskWatchChan <- taskKeeper{c.ID(), uint64(id), true}
return nil, nil
}
func taskErrorHandler(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
if len(args) < 2 {
log.Warn("Invalid task.error RPC")
return nil, berrors.ErrInvalidArguments
}
id, ok := args[0].(float64)
if !ok {
log.Warnf("Invalid task.id %v in task.done RPC", args[0])
return nil, berrors.ErrInvalidArguments
}
err, ok := args[1].(string)
if !ok {
log.Warn("Invalid description in task.error RPC")
return nil, berrors.ErrInvalidArguments
}
log.Debugf("Task error id: \"%d\" err: \"%s\" from client \"%s\"", int(id), err, c.ID())
result := taskq.Result{
ID: uint64(id),
Err: err,
}
taskq.Done(result)
taskWatchChan <- taskKeeper{c.ID(), uint64(id), true}
return nil, nil
}
func cronRunHandler(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
if len(args) < 2 {
log.Warn("Invalid cron.run RPC")
return nil, berrors.ErrInvalidArguments
}
storeName, ok := args[0].(string)
if !ok {
log.Warn("Invalid storeName when cron.run RPC")
return nil, berrors.ErrInvalidArguments
}
index, ok := args[1].(float64)
if !ok {
log.Warn("Invalid task index when cron.run RPC")
return nil, berrors.ErrInvalidArguments
}
t := taskq.Task{
Type: taskq.ScheduledScript,
Store: storeName,
UserID: "system",
Arguments: map[string]interface{}{
"taskIndex": index,
},
}
resChan := taskq.Push(&t)
res := <-resChan
if res.Err != "" {
return nil, errors.New(res.Err)
}
return res.Result, nil
}
func internalOpenCallback(c *wango.Conn) {
log.Infof("Connected client to TQ: '%s'", c.ID())
workerConnectChan <- c.ID()
}
func internalCloseCallback(c *wango.Conn) {
log.Infof("Disconnected client from TQ: '%s'", c.ID())
workerDisconnectChan <- c.ID()
}
// args: uri string, event interface{}, subscribers array of connIDs
// This data will be transferred sent as event on "events" topic
func publishHandler(c *wango.Conn, _uri string, args ...interface{}) (interface{}, error) {
if len(args) < 2 {
return nil, berrors.ErrInvalidArguments
}
uri, ok := args[0].(string)
if !ok {
return nil, berrors.ErrInvalidArguments
}
wampServer.Publish(uri, args[1])
if len(args) < 3 {
onEventHandler(uri, args[1], nil)
return nil, nil
}
_subscribers, ok := args[2].([]interface{})
if !ok {
return nil, berrors.ErrInvalidArguments
}
subscribers := make([]string, len(_subscribers))
for k, v := range _subscribers {
connID, ok := v.(string)
if !ok {
log.Warn("ConnID is not a string in 'publish' RPC call")
continue
}
subscribers[k] = connID
}
onEventHandler(uri, args[1], subscribers)
return nil, nil
}
func subStoresHandler(c *wango.Conn, _uri string, args ...interface{}) (interface{}, error) {
storeName := strings.TrimPrefix(_uri, uriSubStores)
t := taskq.Task{
Store: storeName,
Type: taskq.DbFind,
UserID: "root",
Arguments: map[string]interface{}{
"query": map[string]interface{}{},
"take": 1,
},
}
_res, err := taskq.PushAndGetResult(&t, 0)
if err != nil {
return nil, err
}
result := map[string]interface{}{"event": "init", "data": nil}
res, ok := _res.(map[string]interface{})
if !ok {
result["data"] = _res
return result, nil
}
result["data"] = res["items"]
return result, nil
}
func taskWatcher() {
workerTasks := map[string]map[uint64]struct{}{}
errWorkerDisconnectedText := "connection with worker lost"
for {
select {
case t := <-taskWatchChan:
if t.done {
delete(workerTasks[t.workerID], t.taskID)
} else {
workerTasks[t.workerID][t.taskID] = struct{}{}
}
case workerID := <-workerConnectChan:
workerTasks[workerID] = map[uint64]struct{}{}
case workerID := <-workerDisconnectChan:
workerTasksNumber := len(workerTasks[workerID])
if len(workerTasks[workerID]) == 0 {
continue
}
log.Infof("Worker %s disconnected. Need to close all proccessing tasks by this worker with error. Worker is running %d tasks now.", workerID, workerTasksNumber)
for taskID := range workerTasks[workerID] {
result := taskq.Result{
ID: taskID,
Err: errWorkerDisconnectedText,
}
taskq.Done(result)
}
delete(workerTasks, workerID)
log.Infof("All workers %s tasks closed.", workerID)
}
}
}
func sessionNewHandler(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
if len(args) < 1 {
log.Warn("Invalid cron.run RPC")
return nil, berrors.ErrInvalidArguments
}
user, ok := args[0].(map[string]interface{})
if !ok {
userID, ok := args[0].(string)
if !ok {
return nil, berrors.ErrInvalidArguments
}
user = map[string]interface{}{"_id": userID}
}
return sessions.NewSession(user, "")
}
func checkErrorAndPanic(err error) {
if err != nil {
panic(err)
}
}
func runServer() {
go taskWatcher()
wampServer.SetSessionOpenCallback(internalOpenCallback)
wampServer.SetSessionCloseCallback(internalCloseCallback)
config.OnUpdate(func(c map[string]config.Store) {
wampServer.Publish("config", c)
runMigrationScripts(c)
})
checkErrorAndPanic(wampServer.RegisterRPCHandler(getTaskURI, taskGetHandler))
checkErrorAndPanic(wampServer.RegisterRPCHandler(doneTaskURI, taskDoneHandler))
checkErrorAndPanic(wampServer.RegisterRPCHandler(errorTaskURI, taskErrorHandler))
checkErrorAndPanic(wampServer.RegisterRPCHandler(publishURI, publishHandler))
checkErrorAndPanic(wampServer.RegisterRPCHandler(cronRunURI, cronRunHandler))
checkErrorAndPanic(wampServer.RegisterRPCHandler(rpcSessionNew, sessionNewHandler))
checkErrorAndPanic(wampServer.RegisterSubHandler(uriSubStores, subStoresHandler, nil, nil))
sr.Init(wampServer, srEventHandler)
s := new(websocket.Server)
s.Handshake = func(c *websocket.Config, r *http.Request) error {
return nil
}
s.Handler = func(ws *websocket.Conn) {
wampServer.WampHandler(ws, nil)
}
if tqPort := os.Getenv("BLANK_TASK_QUEUE_PORT"); len(tqPort) > 0 {
listeningPort = tqPort
}
wampServer.RegisterSubHandler("assets-update", func(c *wango.Conn, uri string, args ...interface{}) (interface{}, error) {
return nil, nil
}, nil, nil)
r := chi.NewRouter()
r.Handle("/", s)
if nodeEnv := os.Getenv("NODE_ENV"); nodeEnv == "DEV" {
r.Post("/config", appconfig.PostConfigHandler)
r.Post("/lib/lib.zip", func(w http.ResponseWriter, r *http.Request) {
appconfig.PostLibHandler(w, r)
wampServer.Publish("assets-update", "lib.zip")
})
r.Post("/assets/assets.zip", appconfig.PostAssetsHandler)
}
r.Get("/lib/", libHandler)
log.Info("TaskQueue will listen for connection on port ", listeningPort)
if _, err := registry.Register("taskQueue", "ws://127.0.0.1", listeningPort, "0", ""); err != nil {
log.Fatalf("register taskQ error: %v", err)
}
err := http.ListenAndServe(":"+listeningPort, r)
if err != nil {
log.Fatalf("ListenAndServe: %v", err)
}
}
func libHandler(w http.ResponseWriter, r *http.Request) {
if _, err := w.Write(appconfig.GetLibZip()); err != nil {
log.Debugf("[libHandler] write error: %v", err)
}
}