Make adding servers async, checks after starting http service to avoid delays, add prom metrics

.gitignore

@@ -1 +1,5 @@
 *.mmdb
+userdata.csv
+dlrouter-apt.yaml
+*.yaml
+!dlrouter.yaml

dlrouter.yaml

@@ -1,12 +1,16 @@
 geodb: GeoIP2-City.mmdb
-dl_map: userdata.csv
 
 servers:
-    - mirrors.tuna.tsinghua.edu.cn/armbian/
+    - https://mirrors.tuna.tsinghua.edu.cn/armbian-releases/
-    - armbian.tnahosting.net/apt/
+    - https://mirrors.bfsu.edu.cn/armbian-releases/
-    - us.mirrors.fossho.st/armbian/armbian/
+    - https://mirrors.nju.edu.cn/armbian-releases/
-    - uk.mirrors.fossho.st/armbian/apt/
+    - https://mirrors.ustc.edu.cn/armbian-dl/
-    - armbian.systemonachip.net/apt/
+    - https://mirror.12z.eu/pub/linux/armbian/dl/
-    - mirrors.netix.net/armbian/apt/
+    - https://armbian.tnahosting.net/dl/
-    - mirrors.dotsrc.org/armbian-apt/
+    - https://stpete-mirror.armbian.com/dl/
-    - armbian.lv.auroradev.org/apt/
+    - https://mirror.armbian.de/dl/
+    - https://mirrors.netix.net/armbian/dl/
+    - https://mirrors.dotsrc.org/armbian-dl/
+    - https://armbian.hosthatch.com/dl/
+    - https://xogium.performanceservers.nl/dl/
+    - https://github.com/armbian/mirror/releases/download/

go.mod

@@ -4,16 +4,24 @@ go 1.17
 
 require (
 	github.com/oschwald/maxminddb-golang v1.8.0
+	github.com/prometheus/client_golang v1.11.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/viper v1.10.1
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/magiconair/properties v1.8.5 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.4.3 // indirect
 	github.com/pelletier/go-toml v1.9.4 // 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
 	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
@@ -21,6 +29,7 @@ require (
 	github.com/subosito/gotenv v1.2.0 // indirect
 	golang.org/x/sys v0.0.0-20211210111614-af8b64212486 // indirect
 	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -1,23 +1,109 @@
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@@ -31,32 +117,75 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
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 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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 golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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 golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
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+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
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 gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+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=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

http.go

@@ -54,6 +54,7 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 
 	if dlMap != nil {
 		if newPath, exists := dlMap[strings.TrimLeft(r.URL.Path, "/")]; exists {
+			downloadsMapped.Inc()
 			redirectPath = path.Join(server.Path, newPath)
 		}
 	}
@@ -64,6 +65,9 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 		Path:   redirectPath,
 	}
 
+	server.Redirects.Inc()
+	redirectsServed.Inc()
+
 	w.Header().Set("X-Geo-Distance", fmt.Sprintf("%f", distance))
 	w.Header().Set("Location", u.String())
 	w.WriteHeader(http.StatusFound)

main.go

@@ -2,12 +2,16 @@ package main
 
 import (
 	"github.com/oschwald/maxminddb-golang"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/viper"
 	"net"
 	"net/http"
 	"net/url"
 	"strings"
+	"sync"
 )
 
 var (
@@ -15,6 +19,16 @@ var (
 	servers ServerList
 
 	dlMap map[string]string
+
+	redirectsServed = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "armbian_router_redirects",
+		Help: "The total number of processed redirects",
+	})
+
+	downloadsMapped = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "armbian_router_download_maps",
+		Help: "The total number of mapped download paths",
+	})
 )
 
 // City represents a MaxmindDB city
@@ -57,7 +71,42 @@ func main() {
 
 	serverList := viper.GetStringSlice("servers")
 
+	var wg sync.WaitGroup
+
 	for _, server := range serverList {
+		wg.Add(1)
+
+		go func(server string) {
+			defer wg.Done()
+
+			addServer(server)
+		}(server)
+	}
+
+	wg.Wait()
+
+	log.Info("Servers added, checking statuses")
+
+	// Start check loop
+	go servers.checkLoop()
+
+	log.Info("Starting")
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/status", statusHandler)
+	mux.HandleFunc("/mirrors", mirrorsHandler)
+	mux.HandleFunc("/reload", reloadHandler)
+	mux.HandleFunc("/dl_map", dlMapHandler)
+	mux.Handle("/metrics", promhttp.Handler())
+	mux.HandleFunc("/", RealIPMiddleware(redirectHandler))
+
+	http.ListenAndServe(viper.GetString("bind"), mux)
+}
+
+var metricReplacer = strings.NewReplacer(".", "_", "-", "_")
+
+func addServer(server string) {
 	var prefix string
 
 	if !strings.HasPrefix(server, "http") {
@@ -71,7 +120,7 @@ func main() {
 			"error":  err,
 			"server": server,
 		}).Warning("Server is invalid")
-			continue
+		return
 	}
 
 	ips, err := net.LookupIP(u.Host)
@@ -81,7 +130,7 @@ func main() {
 			"error":  err,
 			"server": server,
 		}).Warning("Could not resolve address")
-			continue
+		return
 	}
 
 	var city City
@@ -92,14 +141,20 @@ func main() {
 			"error":  err,
 			"server": server,
 		}).Warning("Could not geolocate address")
-			continue
+		return
 	}
 
+	redirects := promauto.NewCounter(prometheus.CounterOpts{
+		Name: "armbian_router_redirects_" + metricReplacer.Replace(u.Host),
+		Help: "The number of redirects for server " + u.Host,
+	})
+
 	servers = append(servers, &Server{
 		Host:      u.Host,
 		Path:      u.Path,
 		Latitude:  city.Location.Latitude,
 		Longitude: city.Location.Longitude,
+		Redirects: redirects,
 	})
 
 	log.WithFields(log.Fields{
@@ -109,23 +164,3 @@ func main() {
 		"longitude": city.Location.Longitude,
 	}).Info("Added server")
 }
-
-	log.Info("Servers added, checking statuses")
-	// Force initial check before running
-	servers.Check()
-
-	// Start check loop
-	go servers.checkLoop()
-
-	log.Info("Starting")
-
-	mux := http.NewServeMux()
-
-	mux.HandleFunc("/status", statusHandler)
-	mux.HandleFunc("/mirrors", mirrorsHandler)
-	mux.HandleFunc("/reload", reloadHandler)
-	mux.HandleFunc("/dl_map", dlMapHandler)
-	mux.HandleFunc("/", RealIPMiddleware(redirectHandler))
-
-	http.ListenAndServe(viper.GetString("bind"), mux)
-}

map.go

@@ -20,6 +20,8 @@ func loadMap(file string) (map[string]string, error) {
 
 	r := csv.NewReader(f)
 
+	r.Comma = '|'
+
 	for {
 		row, err := r.Read()
 

servers.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
 	"math"
 	"net"
@@ -23,6 +24,7 @@ type Server struct {
 	Path      string
 	Latitude  float64
 	Longitude float64
+	Redirects prometheus.Counter
 }
 
 type ServerList []*Server
@@ -31,9 +33,8 @@ func (s ServerList) checkLoop() {
 	t := time.NewTicker(60 * time.Second)
 
 	for {
-		<-t.C
-
 		s.Check()
+		<-t.C
 	}
 }
 
@@ -47,6 +48,8 @@ func (s ServerList) Check() {
 		wg.Add(1)
 
 		go func(server *Server) {
+			defer wg.Done()
+
 			req, err := http.NewRequest(http.MethodGet, "https://"+server.Host+"/"+strings.TrimLeft(server.Path, "/"), nil)
 
 			req.Header.Set("User-Agent", "ArmbianRouter/1.0 (Go "+runtime.Version()+")")
@@ -54,7 +57,6 @@ func (s ServerList) Check() {
 			if err != nil {
 				// This should never happen.
 				log.WithError(err).Warning("Invalid request! This should not happen, please check config.")
-				wg.Done()
 				return
 			}
 
@@ -64,18 +66,28 @@ func (s ServerList) Check() {
 				if server.Available {
 					log.WithField("server", server.Host).Info("Server went offline")
 					server.Available = false
+				} else {
+					log.WithField("server", server.Host).Info("Server is still offline")
 				}
-				wg.Done()
 				return
 			}
 
-			if (res.StatusCode == http.StatusOK || res.StatusCode == http.StatusMovedPermanently || res.StatusCode == http.StatusFound) &&
+			if res.StatusCode == http.StatusOK || res.StatusCode == http.StatusMovedPermanently || res.StatusCode == http.StatusFound || res.StatusCode == http.StatusNotFound {
-				!server.Available {
+				if !server.Available {
 					server.Available = true
 					log.WithField("server", server.Host).Info("Server is online")
 				}
+			} else {
+				log.WithFields(log.Fields{
+					"server":       server.Host,
+					"responseCode": res.StatusCode,
+				}).Debug("Server status not known")
 
-			wg.Done()
+				if server.Available {
+					log.WithField("server", server.Host).Info("Server went offline")
+					server.Available = false
+				}
+			}
 		}(server)
 	}
 

userdata.csv

@@ -1 +0,0 @@
-bananapi/Bullseye_current,bananapi/archive/Armbian_21.08.1_Bananapi_bullseye_current_5.10.60.img.xz