From 4fa735eb939948c3c1ffb9f3de6056cb81bc6ac7 Mon Sep 17 00:00:00 2001
From: Nadeem Jamali <nadeem@candis.io>
Date: Tue, 7 Apr 2020 13:26:52 +0200
Subject: [PATCH 1/2] initialized go module

---
 go.mod                          |  8 ++++++++
 go.sum                          | 18 ++++++++++++++++++
 {collector => pkg}/collector.go |  0
 3 files changed, 26 insertions(+)
 create mode 100644 go.mod
 create mode 100644 go.sum
 rename {collector => pkg}/collector.go (100%)

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..cca3dab
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module github.com/nadeemjamali/sqs-exporter
+
+go 1.13
+
+require (
+	github.com/ashiddo11/sqs-exporter v0.0.1
+	github.com/aws/aws-sdk-go v1.30.5
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..78d0ec8
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,18 @@
+github.com/ashiddo11/sqs-exporter v0.0.1 h1:D8w6ZtnLNlG19aa35hbMDa7XRVwvRr6oVHlmPCbQSO8=
+github.com/ashiddo11/sqs-exporter v0.0.1/go.mod h1:i24T5gi/rIPwWLN9ME0a+d5mH/hQzcR2G+gokt6Xpqc=
+github.com/aws/aws-sdk-go v1.30.5 h1:i+sSesaMrSxiUt3NJddOApe2mXK+VNBgfcmRTvNFrXM=
+github.com/aws/aws-sdk-go v1.30.5/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jmespath/go-jmespath v0.3.0 h1:OS12ieG61fsCg5+qLJ+SsW9NicxNkg3b25OyT2yCeUc=
+github.com/jmespath/go-jmespath v0.3.0/go.mod h1:9QtRXoHjLGCJ5IBSaohpXITPlowMeeYCZ7fLUTSywik=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/collector/collector.go b/pkg/collector.go
similarity index 100%
rename from collector/collector.go
rename to pkg/collector.go

From 4890a666b93ad94222e916156db79dfd0bbbda0e Mon Sep 17 00:00:00 2001
From: Nadeem Jamali <nadeem@candis.io>
Date: Wed, 8 Apr 2020 12:08:51 +0200
Subject: [PATCH 2/2] added prometheus metrics and cron job for monitoring

---
 go.mod           |  2 +
 go.sum           | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
 main.go          | 90 +++++++++++++++++++++++++++++++++++++--------
 pkg/collector.go | 74 ++++++++++++++++++++++++++-----------
 4 files changed, 224 insertions(+), 38 deletions(-)

diff --git a/go.mod b/go.mod
index cca3dab..3f9686e 100644
--- a/go.mod
+++ b/go.mod
@@ -5,4 +5,6 @@ go 1.13
 require (
 	github.com/ashiddo11/sqs-exporter v0.0.1
 	github.com/aws/aws-sdk-go v1.30.5
+	github.com/go-co-op/gocron v0.1.0
+	github.com/prometheus/client_golang v1.5.1
 )
diff --git a/go.sum b/go.sum
index 78d0ec8..27c2cea 100644
--- a/go.sum
+++ b/go.sum
@@ -1,18 +1,114 @@
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/ashiddo11/sqs-exporter v0.0.1 h1:D8w6ZtnLNlG19aa35hbMDa7XRVwvRr6oVHlmPCbQSO8=
 github.com/ashiddo11/sqs-exporter v0.0.1/go.mod h1:i24T5gi/rIPwWLN9ME0a+d5mH/hQzcR2G+gokt6Xpqc=
 github.com/aws/aws-sdk-go v1.30.5 h1:i+sSesaMrSxiUt3NJddOApe2mXK+VNBgfcmRTvNFrXM=
 github.com/aws/aws-sdk-go v1.30.5/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
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+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
index 5dc5434..e7e2842 100644
--- a/main.go
+++ b/main.go
@@ -1,38 +1,96 @@
 package main
 
 import (
+	"context"
 	"flag"
-	"log"
+	"fmt"
 	"net/http"
+	"os"
+	"strconv"
+	"time"
 
-	"github.com/ashiddo11/sqs-exporter/collector"
+	"github.com/go-co-op/gocron"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
-func logRequest(handler http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		log.Printf("%s %s %s\n", r.RemoteAddr, r.Method, r.URL)
-		handler.ServeHTTP(w, r)
-	})
-}
+var (
+	port 				= getEnv("PORT", "9434")
+	intervalStr 		= getEnv("INTERVAL", "1")
+	endpoint				=	getEnv("ENDPOINT", "metrics")
+)
 
 func main() {
+	ctx := context.Background()
+	interval, conversionError := strconv.ParseUint(intervalStr, 10, 64)
+	if conversionError != nil {
+		panic(conversionError)
+	}
+
+	httpServer, err := setupMetricsServer()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	errChanel := make(chan error)
+
+	go func() { 
+		e := httpServer.ListenAndServe()
+		errChanel <- e
+	}()
+
+	scheduler := gocron.NewScheduler(time.UTC)
+	
+	scheduler.Every(interval).Minutes().Do(startMonitoring, errChanel)
+	scheduler.Start()
+
+	fmt.Println(fmt.Sprintf("metrics server listening at port %v with monitoring interval of %v minute(s).", httpServer.Addr, interval))
+	err = <- errChanel
+	fmt.Println(err)
+	fmt.Println("Terminating the server and monitoring")
+	httpServer.Shutdown(ctx)
+	scheduler.Clear()
+}
+
+func startMonitoring(errChanel chan error){
+	err := collector.MonitorSQS()
+	if err != nil{
+		errChanel <- err
+	}
+	return
+}
+
+func setupMetricsServer() (*http.Server, error) {
 	var (
-		listenAddress = flag.String("web.listen-address", ":9434", "Address to listen on for web interface and telemetry.")
-		metricsPath   = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
+		listenAddress = flag.String("web.listen-address", ":"+port, "Address to listen on for web interface and telemetry.")
+		metricsPath   = flag.String("web.telemetry-path", "/"+endpoint, "Path under which to expose metrics.")
 	)
 	flag.Parse()
-
-	http.Handle(*metricsPath, collector.MetricHandler{})
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+	
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte(`
 	        <html>
 	        <head><title>SQS Exporter</title></head>
 	        <body>
 	        <h1>SQS Exporter</h1>
-	        <p><a href='` + *metricsPath + `'>Metrics</a></p>
+	        <p><a href='`+*metricsPath+`'>Metrics</a></p>
 	        </body>
 	        </html>`))
 	})
-	log.Println("Starting exporter on", *listenAddress)
-	log.Fatal(http.ListenAndServe(*listenAddress, logRequest(http.DefaultServeMux)))
+	mux.Handle(*metricsPath, promhttp.Handler())	
+	httpServer := &http.Server{
+		Addr: *listenAddress,
+		Handler: mux,
+	}
+
+	return httpServer, nil
+}
+
+// GetEnv returns the value of an environment variable with a fallback
+func getEnv(key, fallback string) string {
+	if value, ok := os.LookupEnv(key); ok {
+		return value
+	}
+	return fallback
 }
diff --git a/pkg/collector.go b/pkg/collector.go
index c538e6a..67e74ae 100644
--- a/pkg/collector.go
+++ b/pkg/collector.go
@@ -2,30 +2,53 @@ package collector
 
 import (
 	"fmt"
+	"strconv"
+	"strings"
+
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/sqs"
-	"log"
-	"net/http"
-	"strings"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
-type MetricHandler struct{}
+var (
+	visibleMessageGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "sqs_messages_visible",
+		Help: "Type: Gauge, The number of available messages in queue(s). Use the name of the queue as the label to get the messages of a specific queue e.g `sqs_messages_visible{queue_name=\"<QUEUE NAME>\"}`.",
+	}, []string{"queue_name"})
+	delayedMessageGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "sqs_messages_delayed",
+		Help: "Type: Gauge, The number of messages waiting to be added into queue(s). Use the name of the queue as the label to get the messages of a specific queue e.g `sqs_messages_delayed{queue_name=\"<QUEUE NAME>\"}`.",
+	}, []string{"queue_name"})
+	invisibleMessageGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "sqs_messages_invisible",
+		Help: "Type: Gauge, The number of messages in flight in queue(s). Use the name of the queue as the label to get the messages of a specific queue e.g `sqs_messages_invisible{queue_name=\"<QUEUE NAME>\"}`.",
+	}, []string{"queue_name"})
+)
+
+func init() {
+	prometheus.MustRegister(visibleMessageCounter)
+	prometheus.MustRegister(delayedMessageCounter)
+	prometheus.MustRegister(invisibleMessageCounter)
+}
+
+// MonitorSQS Retrieves the attributes of all allowed queues from SQS and appends the metrics
+func MonitorSQS() error {
+	queues,listQueueTags, err := getQueues()
+	if err != nil {
+		return err
+	}
 
-func (h MetricHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	queues,listQueueTags := getQueues()
 	for queue, attr := range queues {
-		msgAvailable := *attr.Attributes["ApproximateNumberOfMessages"]
-		msgDelayed := *attr.Attributes["ApproximateNumberOfMessagesDelayed"]
-		msgNotvisible := *attr.Attributes["ApproximateNumberOfMessagesNotVisible"]
-		tags := ""
-		for key, value := range listQueueTags[queue].Tags {
-			tags += "," + key + "=\"" + *value + "\""
-		}
-		fmt.Fprintf(w, "sqs_messages_visible{queue_name=\"%s\"%s} %+v\n", queue, tags, msgAvailable)
-		fmt.Fprintf(w, "sqs_messages_delayed{queue_name=\"%s\"%s} %+v\n", queue, tags, msgDelayed)
-		fmt.Fprintf(w, "sqs_messages_not_visible{queue_name=\"%s\"%s} %+v\n", queue, tags, msgNotvisible)
+		msgAvailable, msgError := strconv.ParseFloat(*attr.Attributes["ApproximateNumberOfMessages"], 64)
+		msgDelayed, delayError := strconv.ParseFloat(*attr.Attributes["ApproximateNumberOfMessagesDelayed"], 64)
+		msgNotVisible, invisibleError := strconv.ParseFloat(*attr.Attributes["ApproximateNumberOfMessagesNotVisible"], 64)
+		
+		visibleMessageGauge.WithLabelValues(queue).Add(msgAvailable)
+		delayedMessageGauge.WithLabelValues(queue).Add(msgDelayed)
+		invisibleMessageGauge.WithLabelValues(queue).Add(msgNotVisible)
 	}
+	return nil
 }
 
 func getQueueName(url string) (queueName string) {
@@ -34,19 +57,20 @@ func getQueueName(url string) (queueName string) {
 	return
 }
 
-func getQueues() (queues map[string]*sqs.GetQueueAttributesOutput, tags map[string]*sqs.ListQueueTagsOutput) {
+func getQueues() (queues map[string]*sqs.GetQueueAttributesOutput, tags map[string]*sqs.ListQueueTagsOutput, err error) {
 	sess := session.Must(session.NewSession())
 	client := sqs.New(sess)
 	result, err := client.ListQueues(nil)
 	if err != nil {
-		log.Fatal("Error ", err)
+		return nil, nil, err
 	}
 
 	queues = make(map[string]*sqs.GetQueueAttributesOutput)
 	tags = make(map[string]*sqs.ListQueueTagsOutput)
 
 	if result.QueueUrls == nil {
-		log.Println("Couldnt find any queues in region:", *sess.Config.Region)
+		err = fmt.Errorf("SQS did not return any QueueUrls")
+		return nil, nil, err
 	}
 	for _, urls := range result.QueueUrls {
 		params := &sqs.GetQueueAttributesInput{
@@ -62,11 +86,17 @@ func getQueues() (queues map[string]*sqs.GetQueueAttributesOutput, tags map[stri
 			QueueUrl: aws.String(*urls),
 		}
 
-		resp, _ := client.GetQueueAttributes(params)
-		tagsResp, _ := client.ListQueueTags(tagsParams)
+		resp, err := client.GetQueueAttributes(params)
+		if err != nil {
+			return nil, nil, err
+		}
+		tagsResp, err := client.ListQueueTags(tagsParams)
+		if err != nil {
+			return nil, nil, err
+		}
 		queueName := getQueueName(*urls)
 		queues[queueName] = resp
 		tags[queueName] = tagsResp
 	}
-	return queues,tags
+	return queues,tags, nil
 }