make server & router reusable outside asynqmon package

.gitignore

@@ -25,8 +25,11 @@ package-json.lock
 
 # main binary
 asynqmon
+!cmd/asynqmon
 dist/
+cmd/asynqmon/ui-assets
 
 # Editor configs
+.idea/
 .vscode/
 .editorconfig

Dockerfile

@@ -36,13 +36,13 @@ RUN go mod download
 COPY . .
 
 # Copy frontend static files from /static to the root folder of the backend container.
-COPY --from=frontend ["/static/build", "ui/build"]
+COPY --from=frontend ["/static/build", "ui-assets"]
 
 # Set necessary environmet variables needed for the image and build the server.
 ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64
 
 # Run go build (with ldflags to reduce binary size).
-RUN go build -ldflags="-s -w" -o asynqmon .
+RUN go build -ldflags="-s -w" -o asynqmon ./cmd/asynqmon
 
 #
 # Third stage: 
@@ -55,4 +55,4 @@ FROM scratch
 COPY --from=backend ["/build/asynqmon", "/"]
 
 # Command to run when starting the container.
-ENTRYPOINT ["/asynqmon"]
+ENTRYPOINT ["/asynqmon"]

Makefile

@@ -1,15 +1,14 @@
 .PHONY: assets go_binary build docker
 
-NODE_MODULES_PATH = $(PWD)/ui/node_modules
+NODE_PATH = $(PWD)/ui/node_modules
 
-# Checking for a node_modules folder before building.
 assets:
-	@if [ -d "$(NODE_MODULES_PATH)" ]; then cd ./ui && yarn install; fi
+	@cd ./ui && yarn install --modules-folder $(NODE_PATH) && yarn build --modules-folder $(NODE_PATH)
-	cd ./ui && yarn build
+	@rsync -avu --delete "./ui/build/" "./internal/assets"
 
 # Build go binary.
 go_binary: assets
-	go build -o asynqmon .
+	go build -o asynqmon ./cmd/asynqmon
 
 # Target to build a release binary.
 build: go_binary
@@ -21,4 +20,3 @@ docker:
 		--name asynqmon \
 		-p 8080:8080 \
 		asynqmon --redis-addr=host.docker.internal:6379
-

cmd/asynqmon/main.go

@@ -0,0 +1,138 @@
+package main
+
+import (
+	"crypto/tls"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/ajatprabha/asynqmon"
+	"github.com/go-redis/redis/v7"
+	"github.com/gorilla/mux"
+	"github.com/hibiken/asynq"
+	"github.com/rs/cors"
+)
+
+// Command-line flags
+var (
+	flagPort              int
+	flagRedisAddr         string
+	flagRedisDB           int
+	flagRedisPassword     string
+	flagRedisTLS          string
+	flagRedisURL          string
+	flagRedisInsecureTLS  bool
+	flagRedisClusterNodes 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")
+	flag.StringVar(&flagRedisURL, "redis-url", "", "URL to redis server")
+	flag.BoolVar(&flagRedisInsecureTLS, "redis-insecure-tls", false, "disable TLS certificate host checks")
+	flag.StringVar(&flagRedisClusterNodes, "redis-cluster-nodes", "", "comma separated list of host:port addresses of cluster nodes")
+}
+
+func getRedisOptionsFromFlags() (*redis.UniversalOptions, error) {
+	var opts redis.UniversalOptions
+
+	if flagRedisClusterNodes != "" {
+		opts.Addrs = strings.Split(flagRedisClusterNodes, ",")
+		opts.Password = flagRedisPassword
+	} else {
+		if flagRedisURL != "" {
+			res, err := redis.ParseURL(flagRedisURL)
+			if err != nil {
+				return nil, err
+			}
+			opts.Addrs = append(opts.Addrs, res.Addr)
+			opts.DB = res.DB
+			opts.Password = res.Password
+
+		} else {
+			opts.Addrs = []string{flagRedisAddr}
+			opts.DB = flagRedisDB
+			opts.Password = flagRedisPassword
+		}
+	}
+
+	if flagRedisTLS != "" {
+		opts.TLSConfig = &tls.Config{ServerName: flagRedisTLS}
+	}
+	if flagRedisInsecureTLS {
+		if opts.TLSConfig == nil {
+			opts.TLSConfig = &tls.Config{}
+		}
+		opts.TLSConfig.InsecureSkipVerify = true
+	}
+
+	return &opts, nil
+}
+
+func main() {
+	flag.Parse()
+
+	opts, err := getRedisOptionsFromFlags()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	useRedisCluster := flagRedisClusterNodes != ""
+
+	var redisConnOpt asynq.RedisConnOpt
+	if useRedisCluster {
+		redisConnOpt = asynq.RedisClusterClientOpt{
+			Addrs:     opts.Addrs,
+			Password:  opts.Password,
+			TLSConfig: opts.TLSConfig,
+		}
+	} else {
+		redisConnOpt = asynq.RedisClientOpt{
+			Addr:      opts.Addrs[0],
+			DB:        opts.DB,
+			Password:  opts.Password,
+			TLSConfig: opts.TLSConfig,
+		}
+	}
+
+	inspector := asynq.NewInspector(redisConnOpt)
+	defer inspector.Close()
+
+	var redisClient redis.UniversalClient
+	if useRedisCluster {
+		redisClient = redis.NewClusterClient(opts.Cluster())
+	} else {
+		redisClient = redis.NewClient(opts.Simple())
+	}
+	defer redisClient.Close()
+
+	router := asynqmon.NewRouter(asynqmon.RouterOptions{
+		Inspector:        inspector,
+		Middlewares:      []mux.MiddlewareFunc{loggingMiddleware},
+		RedisClient:      redisClient,
+	})
+
+	router.PathPrefix("/").Handler(asynqmon.NewStaticContentHandler())
+
+	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())
+}

conversion_helpers.go

@@ -1,4 +1,4 @@
-package main
+package asynqmon
 
 import (
 	"time"

go.mod

@@ -1,9 +1,9 @@
-module asynqmon
+module github.com/ajatprabha/asynqmon
 
 go 1.16
 
 require (
-	github.com/go-redis/redis/v8 v8.8.0
+	github.com/go-redis/redis/v7 v7.4.0
 	github.com/gorilla/mux v1.8.0
 	github.com/hibiken/asynq v0.18.3
 	github.com/rs/cors v1.7.0

go.sum

@@ -1,23 +1,14 @@
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-github.com/go-redis/redis/v8 v8.8.0 h1:fDZP58UN/1RD3DjtTXP/fFZ04TFohSYhjZDkcDe2dnw=
-github.com/go-redis/redis/v8 v8.8.0/go.mod h1:F7resOH5Kdug49Otu24RjHWwgK7u9AmtqWMnCV1iP5Y=
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@@ -27,38 +18,30 @@ github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:x
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internal/assets/asset-manifest.json

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+{
+  "files": {
+    "main.js": "/static/js/main.7f58c4a5.chunk.js",
+    "main.js.map": "/static/js/main.7f58c4a5.chunk.js.map",
+    "runtime-main.js": "/static/js/runtime-main.371e21b1.js",
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+    "static/js/2.17755345.chunk.js.map": "/static/js/2.17755345.chunk.js.map",
+    "index.html": "/index.html",
+    "static/js/2.17755345.chunk.js.LICENSE.txt": "/static/js/2.17755345.chunk.js.LICENSE.txt"
+  },
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+    "static/js/2.17755345.chunk.js",
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+  ]
+}

internal/assets/index.html

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internal/assets/manifest.json

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+{
+  "name": "Asynq Monitoring",
+  "short_name": "Asynqmon",
+  "icons": [
+    {
+      "src": "/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}

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+User-agent: *
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+
+/*!
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+  Licensed under the MIT License (MIT), see
+  http://jedwatson.github.io/classnames
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+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)dppx\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)em\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)ex\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)grad\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)in\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)kHz\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)mm\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)ms\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)pc\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)pt\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)px\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)rad\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)rem\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)s\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)turn\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)vh\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)vmax\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)vmin\b */
+
+/*! Rule::       ([0-9]+(\.[0-9]*)?|\.[0-9]+)vw\b */
+
+/*! Rule::       ([a-z]+) */
+
+/*! Rule::       (calc) */
+
+/*! Rule::       (var) */
+
+/*! Rule::       , */
+
+/*! Rule::       - */
+
+/*! Rule::       \( */
+
+/*! Rule::       \) */
+
+/*! Rule::       \* */
+
+/*! Rule::       \+ */
+
+/*! Rule::       \/ */
+
+/*! Rule::       \s+ */
+
+/*! decimal.js-light v2.5.1 https://github.com/MikeMcl/decimal.js-light/LICENCE */
+
+/**
+ * A better abstraction over CSS.
+ *
+ * @copyright Oleg Isonen (Slobodskoi) / Isonen 2014-present
+ * @website https://github.com/cssinjs/jss
+ * @license MIT
+ */
+
+/** @license React v0.19.1
+ * scheduler.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v16.10.2
+ * react-is.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v16.13.1
+ * react-is.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v16.14.0
+ * react-dom.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v16.14.0
+ * react-jsx-runtime.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v16.14.0
+ * react.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/** @license React v17.0.1
+ * react-is.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**!
+ * @fileOverview Kickass library to create and place poppers near their reference elements.
+ * @version 1.16.1-lts
+ * @license
+ * Copyright (c) 2016 Federico Zivolo and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */

internal/assets/static/js/runtime-main.371e21b1.js

@@ -0,0 +1,2 @@
+!function(e){function r(r){for(var n,i,l=r[0],f=r[1],a=r[2],c=0,s=[];c<l.length;c++)i=l[c],Object.prototype.hasOwnProperty.call(o,i)&&o[i]&&s.push(o[i][0]),o[i]=0;for(n in f)Object.prototype.hasOwnProperty.call(f,n)&&(e[n]=f[n]);for(p&&p(r);s.length;)s.shift()();return u.push.apply(u,a||[]),t()}function t(){for(var e,r=0;r<u.length;r++){for(var t=u[r],n=!0,l=1;l<t.length;l++){var f=t[l];0!==o[f]&&(n=!1)}n&&(u.splice(r--,1),e=i(i.s=t[0]))}return e}var n={},o={1:0},u=[];function i(r){if(n[r])return n[r].exports;var t=n[r]={i:r,l:!1,exports:{}};return e[r].call(t.exports,t,t.exports,i),t.l=!0,t.exports}i.m=e,i.c=n,i.d=function(e,r,t){i.o(e,r)||Object.defineProperty(e,r,{enumerable:!0,get:t})},i.r=function(e){"undefined"!==typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},i.t=function(e,r){if(1&r&&(e=i(e)),8&r)return e;if(4&r&&"object"===typeof e&&e&&e.__esModule)return e;var t=Object.create(null);if(i.r(t),Object.defineProperty(t,"default",{enumerable:!0,value:e}),2&r&&"string"!=typeof e)for(var n in e)i.d(t,n,function(r){return e[r]}.bind(null,n));return t},i.n=function(e){var r=e&&e.__esModule?function(){return e.default}:function(){return e};return i.d(r,"a",r),r},i.o=function(e,r){return Object.prototype.hasOwnProperty.call(e,r)},i.p="/";var l=this.webpackJsonpui=this.webpackJsonpui||[],f=l.push.bind(l);l.push=r,l=l.slice();for(var a=0;a<l.length;a++)r(l[a]);var p=f;t()}([]);
+//# sourceMappingURL=runtime-main.371e21b1.js.map

internal/static.go

@@ -0,0 +1,6 @@
+package internal
+
+import "embed"
+
+//go:embed assets/*
+var StaticContents embed.FS

queue_handlers.go

@@ -1,4 +1,4 @@
-package main
+package asynqmon
 
 import (
 	"encoding/json"

redis_info_handlers.go

@@ -1,12 +1,11 @@
-package main
+package asynqmon
 
 import (
-	"context"
 	"encoding/json"
 	"net/http"
 	"strings"
 
-	"github.com/go-redis/redis/v8"
+	"github.com/go-redis/redis/v7"
 	"github.com/hibiken/asynq"
 )
 
@@ -34,8 +33,7 @@ type QueueLocationInfo struct {
 
 func newRedisInfoHandlerFunc(client *redis.Client) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		ctx := context.Background()
+		res, err := client.Info().Result()
-		res, err := client.Info(ctx).Result()
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
@@ -56,14 +54,13 @@ func newRedisInfoHandlerFunc(client *redis.Client) http.HandlerFunc {
 
 func newRedisClusterInfoHandlerFunc(client *redis.ClusterClient, inspector *asynq.Inspector) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		ctx := context.Background()
+		rawClusterInfo, err := client.ClusterInfo().Result()
-		rawClusterInfo, err := client.ClusterInfo(ctx).Result()
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
 		info := parseRedisInfo(rawClusterInfo)
-		rawClusterNodes, err := client.ClusterNodes(ctx).Result()
+		rawClusterNodes, err := client.ClusterNodes().Result()
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return

router.go

@@ -1,173 +1,24 @@
-package main
+package asynqmon
 
 import (
-	"crypto/tls"
+	"github.com/go-redis/redis/v7"
-	"embed"
-	"errors"
-	"flag"
-	"fmt"
-	"io/fs"
-	"log"
-	"net/http"
-	"path/filepath"
-	"strings"
-	"time"
-
-	"github.com/go-redis/redis/v8"
 	"github.com/gorilla/mux"
 	"github.com/hibiken/asynq"
-	"github.com/rs/cors"
 )
 
-// Command-line flags
+type RouterOptions struct {
-var (
+	Inspector   *asynq.Inspector
-	flagPort              int
+	Middlewares []mux.MiddlewareFunc
-	flagRedisAddr         string
+	RedisClient redis.UniversalClient
-	flagRedisDB           int
-	flagRedisPassword     string
-	flagRedisTLS          string
-	flagRedisURL          string
-	flagRedisInsecureTLS  bool
-	flagRedisClusterNodes 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")
-	flag.StringVar(&flagRedisURL, "redis-url", "", "URL to redis server")
-	flag.BoolVar(&flagRedisInsecureTLS, "redis-insecure-tls", false, "disable TLS certificate host checks")
-	flag.StringVar(&flagRedisClusterNodes, "redis-cluster-nodes", "", "comma separated list of host:port addresses of cluster nodes")
 }
 
-// staticFileServer implements the http.Handler interface, so we can use it
+func NewRouter(opts RouterOptions) *mux.Router {
-// 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)
-}
-
-func getRedisOptionsFromFlags() (*redis.UniversalOptions, error) {
-	var opts redis.UniversalOptions
-
-	if flagRedisClusterNodes != "" {
-		opts.Addrs = strings.Split(flagRedisClusterNodes, ",")
-		opts.Password = flagRedisPassword
-	} else {
-		if flagRedisURL != "" {
-			res, err := redis.ParseURL(flagRedisURL)
-			if err != nil {
-				return nil, err
-			}
-			opts.Addrs = append(opts.Addrs, res.Addr)
-			opts.DB = res.DB
-			opts.Password = res.Password
-
-		} else {
-			opts.Addrs = []string{flagRedisAddr}
-			opts.DB = flagRedisDB
-			opts.Password = flagRedisPassword
-		}
-	}
-
-	if flagRedisTLS != "" {
-		opts.TLSConfig = &tls.Config{ServerName: flagRedisTLS}
-	}
-	if flagRedisInsecureTLS {
-		if opts.TLSConfig == nil {
-			opts.TLSConfig = &tls.Config{}
-		}
-		opts.TLSConfig.InsecureSkipVerify = true
-	}
-	return &opts, nil
-}
-
-//go:embed ui/build/*
-var staticContents embed.FS
-
-func main() {
-	flag.Parse()
-
-	opts, err := getRedisOptionsFromFlags()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	useRedisCluster := flagRedisClusterNodes != ""
-
-	var redisConnOpt asynq.RedisConnOpt
-	if useRedisCluster {
-		redisConnOpt = asynq.RedisClusterClientOpt{
-			Addrs:     opts.Addrs,
-			Password:  opts.Password,
-			TLSConfig: opts.TLSConfig,
-		}
-	} else {
-		redisConnOpt = asynq.RedisClientOpt{
-			Addr:      opts.Addrs[0],
-			DB:        opts.DB,
-			Password:  opts.Password,
-			TLSConfig: opts.TLSConfig,
-		}
-	}
-
-	inspector := asynq.NewInspector(redisConnOpt)
-	defer inspector.Close()
-
-	var redisClient redis.UniversalClient
-	if useRedisCluster {
-		redisClient = redis.NewClusterClient(opts.Cluster())
-	} else {
-		redisClient = redis.NewClient(opts.Simple())
-	}
-	defer redisClient.Close()
-
 	router := mux.NewRouter()
-	router.Use(loggingMiddleware)
+	inspector := opts.Inspector
+
+	for _, mf := range opts.Middlewares {
+		router.Use(mf)
+	}
 
 	api := router.PathPrefix("/api").Subrouter()
 	// Queue endpoints.
@@ -234,31 +85,12 @@ func main() {
 	api.HandleFunc("/scheduler_entries/{entry_id}/enqueue_events", newListSchedulerEnqueueEventsHandlerFunc(inspector)).Methods("GET")
 
 	// Redis info endpoint.
-	if useRedisCluster {
+	switch c := opts.RedisClient.(type) {
-		api.HandleFunc("/redis_info", newRedisClusterInfoHandlerFunc(redisClient.(*redis.ClusterClient), inspector)).Methods("GET")
+	case *redis.ClusterClient:
-	} else {
+		api.HandleFunc("/redis_info", newRedisClusterInfoHandlerFunc(c, inspector)).Methods("GET")
-		api.HandleFunc("/redis_info", newRedisInfoHandlerFunc(redisClient.(*redis.Client))).Methods("GET")
+	case *redis.Client:
+		api.HandleFunc("/redis_info", newRedisInfoHandlerFunc(c)).Methods("GET")
 	}
 
-	fs := &staticFileServer{
+	return router
-		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())
 }

scheduler_entry_handlers.go

@@ -1,4 +1,4 @@
-package main
+package asynqmon
 
 import (
 	"encoding/json"

server_handlers.go

@@ -1,4 +1,4 @@
-package main
+package asynqmon
 
 import (
 	"encoding/json"

static.go

@@ -0,0 +1,68 @@
+package asynqmon
+
+import (
+	"embed"
+	"errors"
+	"io/fs"
+	"net/http"
+	"path/filepath"
+
+	"github.com/ajatprabha/asynqmon/internal"
+)
+
+func NewStaticContentHandler() http.Handler {
+	return &staticContentHandler{
+		contents:      internal.StaticContents,
+		staticDirPath: "assets",
+		indexFileName: "index.html",
+	}
+}
+
+// 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 staticContentHandler 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 (h *staticContentHandler) 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 = h.indexFilePath()
+	} else {
+		path = filepath.Join(h.staticDirPath, path)
+	}
+
+	bytes, err := h.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 = h.contents.ReadFile(h.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 (h *staticContentHandler) indexFilePath() string {
+	return filepath.Join(h.staticDirPath, h.indexFileName)
+}

task_handlers.go

@@ -1,4 +1,4 @@
-package main
+package asynqmon
 
 import (
 	"encoding/json"