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main.go
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main.go
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package main
import (
"crypto/tls"
"embed"
"errors"
"flag"
"fmt"
"io/fs"
"log"
"net/http"
"path/filepath"
"time"
"github.com/go-redis/redis/v8"
"github.com/gorilla/mux"
"github.com/hibiken/asynq"
"github.com/hibiken/asynq/inspeq"
"github.com/rs/cors"
)
// Command-line flags
var (
flagPort int
flagRedisAddr string
flagRedisDB int
flagRedisPassword string
flagRedisTLS string
)
func init() {
flag.IntVar(&flagPort, "port", 8080, "port number to use for web ui server")
flag.StringVar(&flagRedisAddr, "redis_addr", "127.0.0.1:6379", "address of redis server to connect to")
flag.IntVar(&flagRedisDB, "redis_db", 0, "redis database number")
flag.StringVar(&flagRedisPassword, "redis_password", "", "password to use when connecting to redis server")
flag.StringVar(&flagRedisTLS, "redis_tls", "", "server name for TLS validation used when connecting to redis server")
}
// staticFileServer implements the http.Handler interface, so we can use it
// to respond to HTTP requests. The path to the static directory and
// path to the index file within that static directory are used to
// serve the SPA in the given static directory.
type staticFileServer struct {
contents embed.FS
staticDirPath string
indexFileName string
}
// ServeHTTP inspects the URL path to locate a file within the static dir
// on the SPA handler.
// If path '/' is requested, it will serve the index file, otherwise it will
// serve the file specified by the URL path.
func (srv *staticFileServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Get the absolute path to prevent directory traversal.
path, err := filepath.Abs(r.URL.Path)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if path == "/" {
path = srv.indexFilePath()
} else {
path = filepath.Join(srv.staticDirPath, path)
}
bytes, err := srv.contents.ReadFile(path)
// If path is error (e.g. file not exist, path is a directory), serve index file.
var pathErr *fs.PathError
if errors.As(err, &pathErr) {
bytes, err = srv.contents.ReadFile(srv.indexFilePath())
}
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if _, err := w.Write(bytes); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func (srv *staticFileServer) indexFilePath() string {
return filepath.Join(srv.staticDirPath, srv.indexFileName)
}
//go:embed ui/build/*
var staticContents embed.FS
func main() {
flag.Parse()
var tlsConfig *tls.Config
if flagRedisTLS != "" {
tlsConfig = &tls.Config{ServerName: flagRedisTLS}
}
inspector := inspeq.New(asynq.RedisClientOpt{
Addr: flagRedisAddr,
DB: flagRedisDB,
Password: flagRedisPassword,
TLSConfig: tlsConfig,
})
defer inspector.Close()
rdb := redis.NewClient(&redis.Options{
Addr: flagRedisAddr,
DB: flagRedisDB,
Password: flagRedisPassword,
TLSConfig: tlsConfig,
})
defer rdb.Close()
router := mux.NewRouter()
router.Use(loggingMiddleware)
api := router.PathPrefix("/api").Subrouter()
// Queue endpoints.
api.HandleFunc("/queues", newListQueuesHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}", newGetQueueHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}", newDeleteQueueHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}:pause", newPauseQueueHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}:resume", newResumeQueueHandlerFunc(inspector)).Methods("POST")
// Queue Historical Stats endpoint.
api.HandleFunc("/queue_stats", newListQueueStatsHandlerFunc(inspector)).Methods("GET")
// Task endpoints.
api.HandleFunc("/queues/{qname}/active_tasks", newListActiveTasksHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}/active_tasks/{task_id}:cancel", newCancelActiveTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/active_tasks:cancel_all", newCancelAllActiveTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/active_tasks:batch_cancel", newBatchCancelActiveTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/pending_tasks", newListPendingTasksHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}/pending_tasks/{task_key}", newDeleteTaskHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/pending_tasks:delete_all", newDeleteAllPendingTasksHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/pending_tasks:batch_delete", newBatchDeleteTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/pending_tasks/{task_key}:archive", newArchiveTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/pending_tasks:archive_all", newArchiveAllPendingTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/pending_tasks:batch_archive", newBatchArchiveTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks", newListScheduledTasksHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}/scheduled_tasks/{task_key}", newDeleteTaskHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/scheduled_tasks:delete_all", newDeleteAllScheduledTasksHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/scheduled_tasks:batch_delete", newBatchDeleteTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks/{task_key}:run", newRunTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks:run_all", newRunAllScheduledTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks:batch_run", newBatchRunTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks/{task_key}:archive", newArchiveTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks:archive_all", newArchiveAllScheduledTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/scheduled_tasks:batch_archive", newBatchArchiveTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks", newListRetryTasksHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}/retry_tasks/{task_key}", newDeleteTaskHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/retry_tasks:delete_all", newDeleteAllRetryTasksHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/retry_tasks:batch_delete", newBatchDeleteTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks/{task_key}:run", newRunTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks:run_all", newRunAllRetryTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks:batch_run", newBatchRunTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks/{task_key}:archive", newArchiveTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks:archive_all", newArchiveAllRetryTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/retry_tasks:batch_archive", newBatchArchiveTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/archived_tasks", newListArchivedTasksHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/queues/{qname}/archived_tasks/{task_key}", newDeleteTaskHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/archived_tasks:delete_all", newDeleteAllArchivedTasksHandlerFunc(inspector)).Methods("DELETE")
api.HandleFunc("/queues/{qname}/archived_tasks:batch_delete", newBatchDeleteTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/archived_tasks/{task_key}:run", newRunTaskHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/archived_tasks:run_all", newRunAllArchivedTasksHandlerFunc(inspector)).Methods("POST")
api.HandleFunc("/queues/{qname}/archived_tasks:batch_run", newBatchRunTasksHandlerFunc(inspector)).Methods("POST")
// Servers endpoints.
api.HandleFunc("/servers", newListServersHandlerFunc(inspector)).Methods("GET")
// Scheduler Entry endpoints.
api.HandleFunc("/scheduler_entries", newListSchedulerEntriesHandlerFunc(inspector)).Methods("GET")
api.HandleFunc("/scheduler_entries/{entry_id}/enqueue_events", newListSchedulerEnqueueEventsHandlerFunc(inspector)).Methods("GET")
// Redis info endpoint.
api.HandleFunc("/redis_info", newRedisInfoHandlerFunc(rdb)).Methods("GET")
fs := &staticFileServer{
contents: staticContents,
staticDirPath: "ui/build",
indexFileName: "index.html",
}
router.PathPrefix("/").Handler(fs)
c := cors.New(cors.Options{
AllowedMethods: []string{"GET", "POST", "DELETE"},
})
handler := c.Handler(router)
srv := &http.Server{
Handler: handler,
Addr: fmt.Sprintf(":%d", flagPort),
WriteTimeout: 10 * time.Second,
ReadTimeout: 10 * time.Second,
}
fmt.Printf("Asynq Monitoring WebUI server is listening on port %d\n", flagPort)
log.Fatal(srv.ListenAndServe())
}