Adopt use of prometheus/exporter-toolkit

exporter-toolkit provides easy implementation of TLS support and other
niceties such as generation of a uniform landing page.

Bump prometheus/client_golang and prometheus/common dependencies to more
recent versions.

Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>

config/config.go

@@ -43,6 +43,7 @@ type Labels struct {
 /*Config configurations for exporter */
 type Config struct {
 	ListenAddress       string
+	WebConfigFile       string
 	MetricPath          string
 	Labels              Labels
 	ExtractServiceTimes bool
@@ -62,6 +63,8 @@ func NewConfig() *Config {
 
 	flag.StringVar(&c.ListenAddress, "listen",
 		loadEnvStringVar(squidExporterListenKey, defaultListenAddress), "Address and Port to bind exporter, in host:port format")
+	flag.StringVar(&c.WebConfigFile, "web.config.file", "",
+		"Path to configuration file that can enable TLS or authentication. See: https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md")
 	flag.StringVar(&c.MetricPath, "metrics-path",
 		loadEnvStringVar(squidExporterMetricsPathKey, defaultMetricsPath), "Metrics path to expose prometheus metrics")
 

go.mod

@@ -3,22 +3,34 @@ module github.com/boynux/squid-exporter
 go 1.19
 
 require (
+	github.com/go-kit/log v0.2.1
 	github.com/pires/go-proxyproto v0.6.2
-	github.com/prometheus/client_golang v1.12.2
-	github.com/prometheus/common v0.34.0
+	github.com/prometheus/client_golang v1.19.0
+	github.com/prometheus/common v0.53.0
+	github.com/prometheus/exporter-toolkit v0.11.0
 	github.com/stretchr/testify v1.7.0
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/go-logfmt/logfmt v0.5.1 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
+	github.com/prometheus/client_model v0.6.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
+	golang.org/x/oauth2 v0.18.0 // indirect
+	golang.org/x/sync v0.5.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )