some simple metrics has been added

Author: Gaardsholt

README.md

@@ -7,7 +7,6 @@
 * Add some server config
 * Security review?
 * Add a go routine that checks if a secret has expire and then deletes it.
-* Add metrics
 
 ## Create a new secret
 

go.mod

@@ -5,6 +5,19 @@ go 1.17
 require (
 	github.com/gorilla/mux v1.8.0
 	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/prometheus/client_golang v1.11.0
 	github.com/rs/zerolog v1.25.0
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
 )
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
+	google.golang.org/protobuf v1.26.0-rc.1 // indirect
+)

go.sum

@@ -1,37 +1,168 @@
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+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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main.go

@@ -9,25 +9,37 @@ import (
 	"time"
 
 	"github.com/Gaardsholt/pass-along/config"
-	"github.com/Gaardsholt/pass-along/secret"
+	"github.com/Gaardsholt/pass-along/metrics"
 	. "github.com/Gaardsholt/pass-along/types"
 	"github.com/gorilla/mux"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/rs/zerolog/log"
 )
 
-var secretStore secret.SecretStore
+var secretStore SecretStore
 var templates map[string]*template.Template
 var startupTime time.Time
+var pr *prometheus.Registry
 
 func init() {
 	config.LoadConfig()
 
 	startupTime = time.Now()
-	secretStore = make(secret.SecretStore)
+	secretStore = make(SecretStore)
 
 	templates = make(map[string]*template.Template)
 	templates["index"] = template.Must(template.ParseFiles("templates/base.html", "templates/index.html"))
 	templates["read"] = template.Must(template.ParseFiles("templates/base.html", "templates/read.html"))
+
+	pr = prometheus.NewRegistry()
+	pr.MustRegister(NewSecretsInCache(&secretStore))
+	pr.MustRegister(metrics.SecretsRead)
+	pr.MustRegister(metrics.ExpiredSecretsRead)
+	pr.MustRegister(metrics.NonExistentSecretsRead)
+	pr.MustRegister(metrics.SecretsCreated)
+	pr.MustRegister(metrics.SecretsCreatedWithError)
+	pr.MustRegister(metrics.SecretsDeleted)
 }
 
 func main() {
@@ -42,7 +54,8 @@ func main() {
 
 	r.HandleFunc("/", IndexHandler).Methods("GET")
 	r.HandleFunc("/", NewHandler).Methods("POST")
-	r.HandleFunc("/metrics", MetricsHandler).Methods("GET")
+	r.Handle("/metrics", promhttp.HandlerFor(pr, promhttp.HandlerOpts{})).Methods("GET")
+	// r.HandleFunc("/metrics", promhttp.Handler()).Methods("GET")
 	r.HandleFunc("/{id}", GetHandler).Methods("GET")
 
 	port := 8080

metrics/metrics.go

@@ -0,0 +1,32 @@
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	SecretsRead = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "secrets_read",
+		Help: "Number of secrets that has been read.",
+	})
+	ExpiredSecretsRead = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "expired_secrets_read",
+		Help: "Number of expired secrets that has been attempted to read.",
+	})
+	NonExistentSecretsRead = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "nonexistent_secrets_read",
+		Help: "Number of non-existent secrets that has been attempted to read.",
+	})
+	SecretsCreated = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "secrets_created",
+		Help: "Number of secrets that has been created.",
+	})
+	SecretsCreatedWithError = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "secrets_created_with_errors",
+		Help: "Number of attempts to create a secret but it failed.",
+	})
+	SecretsDeleted = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "secrets_deleted",
+		Help: "Number of secrets that has been deleted.",
+	})
+)