asynqmon

README

Web UI for monitoring & administering Asynq task queue

Overview

Asynqmon is a web UI tool for monitoring and administering Asynq queues and tasks. It supports integration with Prometheus to display time-series data.

Asynqmon is both a library that you can include in your web application, as well as a binary that you can simply install and run.

Version Compatibility

Please make sure the version compatibility with the Asynq package you are using.

Asynq version	WebUI (asynqmon) version
0.23.x	0.7.x
0.22.x	0.6.x
0.20.x, 0.21.x	0.5.x
0.19.x	0.4.x
0.18.x	0.2.x, 0.3.x
0.16.x, 0.17.x	0.1.x

Install the binary

There're a few options to install the binary:

• Download a release binary
• Download a docker image
• Build a binary from source
• Build a docker image from source

Release binaries

You can download the release binary for your system from the releases page.

Docker image

To pull the Docker image:

# Pull the latest image
docker pull hibiken/asynqmon

# Or specify the image by tag
docker pull hibiken/asynqmon[:tag]

Building from source

To build Asynqmon from source code, make sure you have Go installed (download). Version 1.16 or higher is required. You also need Node.js and Yarn installed in order to build the frontend assets.

Download the source code of this repository and then run:

make build

The asynqmon binary should be created in the current directory.

Building Docker image locally

To build Docker image locally, run:

make docker

Run the binary

To use the defaults, simply run and open http://localhost:8080.

# with a binary
./asynqmon

# with a docker image
docker run --rm \
    --name asynqmon \
    -p 8080:8080 \
    hibiken/asynqmon

By default, Asynqmon web server listens on port 8080 and connects to a Redis server running on 127.0.0.1:6379.

To see all available flags, run:

# with a binary
./asynqmon --help

# with a docker image
docker run hibiken/asynqmon --help

Here's the available flags:

Note: Use --redis-url to specify address, db-number, and password with one flag value; Alternatively, use --redis-addr, --redis-db, and --redis-password to specify each value.

Flag	Env	Description	Default
--port(int)	PORT	port number to use for web ui server	8080
---redis-url(string)	REDIS_URL	URL to redis or sentinel server. See godoc for supported format	""
--redis-addr(string)	REDIS_ADDR	address of redis server to connect to	"127.0.0.1:6379"
--redis-db(int)	REDIS_DB	redis database number	0
--redis-password(string)	REDIS_PASSWORD	password to use when connecting to redis server	""
--redis-cluster-nodes(string)	REDIS_CLUSTER_NODES	comma separated list of host:port addresses of cluster nodes	""
--redis-tls(string)	REDIS_TLS	server name for TLS validation used when connecting to redis server	""
--redis-insecure-tls(bool)	REDIS_INSECURE_TLS	disable TLS certificate host checks	false
--enable-metrics-exporter(bool)	ENABLE_METRICS_EXPORTER	enable prometheus metrics exporter to expose queue metrics	false
--prometheus-addr(string)	PROMETHEUS_ADDR	address of prometheus server to query time series	""
--read-only(bool)	READ_ONLY	use web UI in read-only mode	false

Connecting to Redis

To connect to a single redis server, use either --redis-url or (--redis-addr, --redis-db, and --redis-password).

Example:

$ ./asynqmon --redis-url=redis://:mypassword@localhost:6380/2

$ ./asynqmon --redis-addr=localhost:6380 --redis-db=2 --redis-password=mypassword

To connect to redis-sentinels, use --redis-url.

Example:

$ ./asynqmon --redis-url=redis-sentinel://:mypassword@localhost:5000,localhost:5001,localhost:5002?master=mymaster

To connect to a redis-cluster, use --redis-cluster-nodes.

Example:

$ ./asynqmon --redis-cluster-nodes=localhost:7000,localhost:7001,localhost:7002,localhost:7003,localhost:7004,localhost:7006

Integration with Prometheus

The binary supports two flags to enable integration with Prometheus.

First, enable metrics exporter to expose queue metrics to Prometheus server by passing --enable-metrics-exporter flag. The metrics data is now available under /metrics for Prometheus server to scrape.

Once the metrics data is collected by a Prometheus server, you can pass the address of the Prometheus server to asynqmon to query the time-series data. The address can be specified via --prometheus-addr. This enables the metrics view on the Web UI.

Examples

# with a local binary; custom port and connect to redis server at localhost:6380
./asynqmon --port=3000 --redis-addr=localhost:6380

# with prometheus integration enabled
./asynqmon --enable-metrics-exporter --prometheus-addr=http://localhost:9090

# with Docker (connect to a Redis server running on the host machine)
docker run --rm \
    --name asynqmon \
    -p 3000:3000 \
    hibiken/asynqmon --port=3000 --redis-addr=host.docker.internal:6380

# with Docker (connect to a Redis server running in the Docker container)
docker run --rm \
    --name asynqmon \
    --network dev-network \
    -p 8080:8080 \
    hibiken/asynqmon --redis-addr=dev-redis:6379

Next, go to localhost:8080 and see Asynqmon dashboard:

Tasks view

Settings and adaptive dark mode

Import as a Library

Asynqmon is also a library which can be imported into an existing web application.

Example with net/http:

package main

import (
	"log"
	"net/http"

	"github.com/hibiken/asynq"
	"github.com/hibiken/asynqmon"
)

func main() {
	h := asynqmon.New(asynqmon.Options{
		RootPath: "/monitoring", // RootPath specifies the root for asynqmon app
		RedisConnOpt: asynq.RedisClientOpt{Addr: ":6379"},
	})

    // Note: We need the tailing slash when using net/http.ServeMux.
	http.Handle(h.RootPath()+"/", h)

	// Go to http://localhost:8080/monitoring to see asynqmon homepage.
	log.Fatal(http.ListenAndServe(":8080", nil))
}

Example with gorilla/mux:

package main

import (
	"log"
	"net/http"

	"github.com/gorilla/mux"
	"github.com/hibiken/asynq"
	"github.com/hibiken/asynqmon"
)

func main() {
	h := asynqmon.New(asynqmon.Options{
		RootPath: "/monitoring", // RootPath specifies the root for asynqmon app
		RedisConnOpt: asynq.RedisClientOpt{Addr: ":6379"},
	})

	r := mux.NewRouter()
	r.PathPrefix(h.RootPath()).Handler(h)

	srv := &http.Server{
		Handler: r,
		Addr:    ":8080",
	}

	// Go to http://localhost:8080/monitoring to see asynqmon homepage.
	log.Fatal(srv.ListenAndServe())
}

Example with labstack/echo):

package main

import (
	"github.com/labstack/echo/v4"
	"github.com/hibiken/asynq"
	"github.com/hibiken/asynqmon"
)

func main() {
        e := echo.New()

	mon := asynqmon.New(asynqmon.Options{
		RootPath: "/monitoring/tasks",
		RedisConnOpt: asynq.RedisClientOpt{
			Addr: ":6379",
			Password: "",
			DB: 0,
		},
	})
	e.Any("/monitoring/tasks/*", echo.WrapHandler(mon))
	e.Start(":8080")
}

License

Copyright (c) 2019-present Ken Hibino and Contributors. Asynqmon is free and open-source software licensed under the MIT License. Official logo was created by Vic Shóstak and distributed under Creative Commons license (CC0 1.0 Universal).

Documentation

Index

• Variables
• type HTTPHandler
  • func New(opts Options) *HTTPHandler
  • func (h *HTTPHandler) Close() error
  • func (h *HTTPHandler) RootPath() string
  • func (h *HTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request)
• type Options
• type PayloadFormatter
• type PayloadFormatterFunc
  • func (f PayloadFormatterFunc) FormatPayload(taskType string, payload []byte) string
• type ResultFormatter
• type ResultFormatterFunc
  • func (f ResultFormatterFunc) FormatResult(taskType string, result []byte) string

Examples

• HTTPHandler

Variables

var DefaultPayloadFormatter = PayloadFormatterFunc(func(_ string, payload []byte) string {
	if !isPrintable(payload) {
		return "non-printable bytes"
	}
	return string(payload)
})

DefaultPayloadFormatter is the PayloadFormater used by default. It prints the given payload bytes as is if the bytes are printable, otherwise it prints a message to indicate that the bytes are not printable.

var DefaultResultFormatter = ResultFormatterFunc(func(_ string, result []byte) string {
	if !isPrintable(result) {
		return "non-printable bytes"
	}
	return string(result)
})

DefaultResultFormatter is the ResultFormatter used by default. It prints the given result bytes as is if the bytes are printable, otherwise it prints a message to indicate that the bytes are not printable.

Types

type HTTPHandler

type HTTPHandler struct {
	// contains filtered or unexported fields
}

HTTPHandler is a http.Handler for asynqmon application.

Example

package main

import (
	"log"
	"net/http"

	"github.com/hibiken/asynq"
	"github.com/hibiken/asynqmon"
)

func main() {
	h := asynqmon.New(asynqmon.Options{
		RootPath:     "/monitoring",
		RedisConnOpt: asynq.RedisClientOpt{Addr: ":6379"},
	})

	http.Handle(h.RootPath(), h)
	log.Fatal(http.ListenAndServe(":8000", nil)) // visit localhost:8000/monitoring to see asynqmon homepage
}

func New

func New(opts Options) *HTTPHandler

New creates a HTTPHandler with the given options.

func (*HTTPHandler) Close

func (h *HTTPHandler) Close() error

Close closes connections to redis.

func (*HTTPHandler) RootPath

func (h *HTTPHandler) RootPath() string

RootPath returns the root URL path used for asynqmon application. Returned path string does not have the trailing slash.

func (*HTTPHandler) ServeHTTP

func (h *HTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request)

type Options

type Options struct {
	// URL path the handler is responsible for.
	// The path is used for the homepage of asynqmon, and every other page is rooted in this subtree.
	//
	// This field is optional. Default is "/".
	RootPath string

	// RedisConnOpt specifies the connection to a redis-server or redis-cluster.
	//
	// This field is required.
	RedisConnOpt asynq.RedisConnOpt

	// PayloadFormatter is used to convert payload bytes to string shown in the UI.
	//
	// This field is optional.
	PayloadFormatter PayloadFormatter

	// ResultFormatter is used to convert result bytes to string shown in the UI.
	//
	// This field is optional.
	ResultFormatter ResultFormatter

	// PrometheusAddress specifies the address of the Prometheus to connect to.
	//
	// This field is optional. If this field is set, asynqmon will query the Prometheus server
	// to get the time series data about queue metrics and show them in the web UI.
	PrometheusAddress string

	// Set ReadOnly to true to restrict user to view-only mode.
	ReadOnly bool
}

Options are used to configure HTTPHandler.

type PayloadFormatter

type PayloadFormatter interface {
	// FormatPayload takes the task's typename and payload and returns a string representation of the payload.
	FormatPayload(taskType string, payload []byte) string
}

PayloadFormatter is used to convert payload bytes to a string shown in the UI.

type PayloadFormatterFunc

type PayloadFormatterFunc func(string, []byte) string

func (PayloadFormatterFunc) FormatPayload

func (f PayloadFormatterFunc) FormatPayload(taskType string, payload []byte) string

type ResultFormatter

type ResultFormatter interface {
	// FormatResult takes the task's typename and result and returns a string representation of the result.
	FormatResult(taskType string, result []byte) string
}

ResultFormatter is used to convert result bytes to a string shown in the UI.

type ResultFormatterFunc

type ResultFormatterFunc func(string, []byte) string

func (ResultFormatterFunc) FormatResult

func (f ResultFormatterFunc) FormatResult(taskType string, result []byte) string