[feat] add prometheus instrumentation

6 files changed, 109 insertions, 0 deletions

diff --git a/go.mod b/go.mod
index 89224d7..b81e92b 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,9 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab // indirect
 	github.com/gorilla/mux v1.7.3 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/prometheus/client_golang v1.4.0
 	github.com/reiver/go-oi v1.0.0 // indirect
 	github.com/reiver/go-telnet v0.0.0-20180421082511-9ff0b2ab096e
 	github.com/smartystreets/goconvey v1.6.4 // indirect
diff --git a/go.sum b/go.sum
index 48a5319..22dabc3 100644
--- a/go.sum
+++ b/go.sum
@@ -20,10 +20,20 @@ github.com/ProtonMail/go-autostart v0.0.0-20181114175602-c5272053443a/go.mod h1:
 github.com/TheTitanrain/w32 v0.0.0-20180517000239-4f5cfb03fabf/go.mod h1:peYoMncQljjNS6tZwI9WVyQB3qZS6u79/N3mBOcnd3I=
 github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 h1:w1UutsfOrms1J05zt7ISrnJIXKzwaspym5BTKGx93EI=
 github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412/go.mod h1:WPjqKcmVOxf0XSf3YxCJs6N6AOSrOx3obionmG7T0y0=
+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/apparentlymart/go-openvpn-mgmt v0.0.0-20161009010951-9a305aecd7f2 h1:E7mgGSu7JSN+ELgOq2Pddy8fVfAbMN8u1jUvpKpHtXg=
 github.com/apparentlymart/go-openvpn-mgmt v0.0.0-20161009010951-9a305aecd7f2/go.mod h1:69IHK2p7ZvTuKqxDx3vRWZRyBhLh2rNJN3b6XnjCVhY=
 github.com/auth0/go-jwt-middleware v0.0.0-20190805220309-36081240882b h1:CvoEHGmxWl5kONC5icxwqV899dkf4VjOScbxLpllEnw=
 github.com/auth0/go-jwt-middleware v0.0.0-20190805220309-36081240882b/go.mod h1:LWMyo4iOLWXHGdBki7NIht1kHru/0wM179h+d3g8ATM=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/codegangsta/inject v0.0.0-20150114235600-33e0aa1cb7c0 h1:sDMmm+q/3+BukdIpxwO365v/Rbspp2Nt5XntgQRXq8Q=
 github.com/codegangsta/inject v0.0.0-20150114235600-33e0aa1cb7c0/go.mod h1:4Zcjuz89kmFXt9morQgcfYZAYZ5n8WHjt81YYWIwtTM=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -39,30 +49,76 @@ github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7/go.mod h1:dD3CgOrwl
 github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55/go.mod h1:6mmzY2kW1TOOrVy+r41Za2MxXM+hhqTtY3oBKd2AgFA=
 github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f/go.mod h1:D5ao98qkA6pxftxoqzibIBBrLSUli+kYnJqrgBf9cIA=
 github.com/getlantern/systray v0.0.0-20191102120558-baeca33b8639/go.mod h1:7Splj4WBQSps8jODnMgrIV6goKL0N1HR+mhCAEVWlA0=
+github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab h1:xveKWz2iaueeTaUgdetzel+U7exyigDYBryyVfV/rZk=
 github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab/go.mod h1:/P9AEU963A2AYjv4d1V5eVL1CQbEJq6aCNHDDjibzu8=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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+github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
 github.com/skelterjohn/go.wde v0.0.0-20180104102407-a0324cbf3ffe/go.mod h1:zXxNsJHeUYIqpg890APBNEn9GoCbA4Cdnvuv3mx4fBk=
 github.com/skelterjohn/go.wde v0.0.0-20190318181201-adc3f78cdb45/go.mod h1:zXxNsJHeUYIqpg890APBNEn9GoCbA4Cdnvuv3mx4fBk=
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@@ -72,24 +128,35 @@ github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIK
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 golang.org/x/net v0.0.0-20191105084925-a882066a44e0 h1:QPlSTtPE2k6PZPasQUbzuK3p9JbS+vMXYVto8g/yrsg=
 golang.org/x/net v0.0.0-20191105084925-a882066a44e0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+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 v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191105142833-ac3223d80179/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/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
@@ -98,7 +165,11 @@ golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3
 golang.org/x/tools v0.0.0-20191104232314-dc038396d1f0/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+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/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/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
index 86ddfea..ac85c90 100644
--- a/main.go
+++ b/main.go
@@ -7,6 +7,8 @@ import (
 	"0xacab.org/leap/vpnweb/pkg/auth"
 	"0xacab.org/leap/vpnweb/pkg/config"
 	"0xacab.org/leap/vpnweb/pkg/web"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 func main() {
@@ -32,6 +34,9 @@ func main() {
 	web.HttpFileHandler("/ca.crt", opts.ProviderCaPath)
 	web.HttpFileHandler("/3/ca.crt", opts.ProviderCaPath)
 
+	/* prometheus metrics */
+	http.Handle("/metrics", promhttp.Handler())
+
 	pstr := ":" + opts.Port
 	log.Println("Listening in port", opts.Port)
 
diff --git a/pkg/metrics/metrics.go b/pkg/metrics/metrics.go
new file mode 100644
index 0000000..8b4bdbb
--- /dev/null
+++ b/pkg/metrics/metrics.go
@@ -0,0 +1,23 @@
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	FailedLogins = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "vpnweb_failed_logins_total",
+		Help: "The total number of failed logins",
+	})
+
+	SuccessfulLogins = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "vpnweb_successful_logins_total",
+		Help: "The total number of processed events",
+	})
+
+	DownloadedCerts = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "vpnweb_downloaded_certs_total",
+		Help: "The total number of downloaded certs",
+	})
+)
diff --git a/pkg/web/certs.go b/pkg/web/certs.go
index 779bf72..203c9d9 100644
--- a/pkg/web/certs.go
+++ b/pkg/web/certs.go
@@ -16,6 +16,7 @@
 package web
 
 import (
+	"0xacab.org/leap/vpnweb/pkg/metrics"
 	"crypto/rand"
 	"crypto/rsa"
 	"crypto/tls"
@@ -96,4 +97,6 @@ func (ci *caInfo) CertWriter(out io.Writer) {
 
 	// Write the public key
 	pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: certB})
+
+	metrics.DownloadedCerts.Inc()
 }
diff --git a/pkg/web/middleware.go b/pkg/web/middleware.go
index 3a74477..fbbdbaf 100644
--- a/pkg/web/middleware.go
+++ b/pkg/web/middleware.go
@@ -18,6 +18,7 @@ package web
 import (
 	"0xacab.org/leap/vpnweb/pkg/auth/creds"
 	"0xacab.org/leap/vpnweb/pkg/config"
+	"0xacab.org/leap/vpnweb/pkg/metrics"
 	"encoding/json"
 	"github.com/auth0/go-jwt-middleware"
 	"github.com/dgrijalva/jwt-go"
@@ -53,11 +54,14 @@ func AuthMiddleware(authenticationFunc func(*creds.Credentials) bool, opts *conf
 		valid := authenticationFunc(&c)
 
 		if !valid {
+			metrics.FailedLogins.Inc()
 			log.Println("Wrong auth for user", c.User)
 			http.Error(w, "Wrong user and/or password", http.StatusUnauthorized)
 			return
 		}
 
+		metrics.SuccessfulLogins.Inc()
+
 		if strings.ToLower(debugAuth) == "yes" {
 			log.Println("Valid auth for user", c.User)
 		}