feat: Check IP-stack info everytime prober send report #84

This commit add IsIPv6Only function inside `internal/ip` package
and moving `geo` package from `internal/geo` to `internal/ip/geo`.

Although it increases server resource usage, checking hostname to IP is
required every time the prober sends a report so that the `ipv6_only`
record in the database is not up-to-date. Previously, this feature did
not exist.

README.md

@@ -38,14 +38,14 @@ To build the executable binaries, you need:
 
 -   MySQL/MariaDB
 -   [GeoIP Database][geoip_doc] (optional). Place it to `./assets/geoip`,
-    see [./internal/geo/ip.go](./internal/geo/ip.go).
+    see [./internal/ip/geo/geoip.go](./internal/ip/geo/geoip.go).
 
 ## Installation
 
 ### For initial server setup:
 
 1. Download [GeoIP Database][geoip_doc] and place it to `./assets/geoip`.
-   (see [./internal/geo/ip.go](./internal/geo/ip.go)).
+   (see [./internal/ip/geo/geoip.go](./internal/ip/geo/geoip.go)).
 2. Pepare your MySQL/MariaDB.
 3. Copy `.env.example` to `.env` and edit it to match with server environment.
 4. Build the binary with `make server` (or `make build` to build both

cmd/client/probe.go

@@ -14,6 +14,7 @@ import (
 	"time"
 
 	"github.com/ditatompel/xmr-remote-nodes/internal/config"
+	"github.com/ditatompel/xmr-remote-nodes/internal/ip"
 	"github.com/ditatompel/xmr-remote-nodes/internal/monero"
 
 	"github.com/spf13/cobra"
@@ -334,6 +335,12 @@ func (p *proberClient) fetchFee(client http.Client, endpoint string) (uint, erro
 }
 
 func (p *proberClient) reportResult(node monero.Node, tookTime float64) error {
+	if !node.IsTor {
+		if hostIps, err := net.LookupIP(node.Hostname); err == nil {
+			node.IPv6Only = ip.IsIPv6Only(hostIps)
+		}
+	}
+
 	jsonData, err := json.Marshal(monero.ProbeReport{
 		TookTime: tookTime,
 		Message:  p.message,

internal/ip/ip.go

@@ -0,0 +1,16 @@
+// Package ip provides IP address related functions
+package ip
+
+import (
+	"net"
+)
+
+// IsIPv6Only returns true if all given IPs are IPv6
+func IsIPv6Only(ips []net.IP) bool {
+	for _, ip := range ips {
+		if ip.To4() != nil {
+			return false
+		}
+	}
+	return true
+}

internal/ip/ip_test.go

@@ -0,0 +1,46 @@
+package ip
+
+import (
+	"net"
+	"testing"
+)
+
+// Single test: go test ./internal/ip -bench TestIsIPv6Only -benchmem -run=^$ -v
+func TestIsIPv6Only(t *testing.T) {
+	tests := []struct {
+		name string
+		ips  []net.IP
+		want bool
+	}{
+		{
+			name: "IPv4",
+			ips: []net.IP{
+				net.ParseIP("1.1.1.1"),
+			},
+			want: false,
+		},
+		{
+			name: "IPv6",
+			ips: []net.IP{
+				net.ParseIP("2606:4700::6810:85e5"),
+			},
+			want: true,
+		},
+		{
+			name: "IPv6 and IPv4",
+			ips: []net.IP{
+				net.ParseIP("1.1.1.1"),
+				net.ParseIP("2606:4700::6810:84e5"),
+			},
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsIPv6Only(tt.ips); got != tt.want {
+				t.Errorf("IsIPv6Only() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

internal/monero/monero.go

@@ -12,7 +12,7 @@ import (
 	"time"
 
 	"github.com/ditatompel/xmr-remote-nodes/internal/database"
-
+	"github.com/ditatompel/xmr-remote-nodes/internal/ip"
 	"github.com/jmoiron/sqlx/types"
 )
 
@@ -196,9 +196,9 @@ func (r *moneroRepo) Add(protocol string, hostname string, port uint) error {
 	if strings.HasSuffix(hostname, ".onion") {
 		is_tor = true
 	}
-	ip := ""
 
-	ipv6_only := true
+	ipAddr := ""
+	ipv6_only := false
 
 	if !is_tor {
 		hostIps, err := net.LookupIP(hostname)
@@ -206,12 +206,7 @@ func (r *moneroRepo) Add(protocol string, hostname string, port uint) error {
 			return err
 		}
 
-		for _, hostIp := range hostIps {
+		ipv6_only = ip.IsIPv6Only(hostIps)
-			if hostIp.To4() != nil {
-				ipv6_only = false
-				break
-			}
-		}
 
 		hostIp := hostIps[0]
 		if hostIp.IsPrivate() {
@@ -221,7 +216,7 @@ func (r *moneroRepo) Add(protocol string, hostname string, port uint) error {
 			return errors.New("IP address is loopback address")
 		}
 
-		ip = hostIp.String()
+		ipAddr = hostIp.String()
 	}
 
 	row, err := r.db.Query(`
@@ -276,7 +271,7 @@ func (r *moneroRepo) Add(protocol string, hostname string, port uint) error {
 		port,
 		is_tor,
 		"",
-		ip,
+		ipAddr,
 		0,
 		0,
 		time.Now().Unix(),

internal/monero/report.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/ditatompel/xmr-remote-nodes/internal/geo"
+	"github.com/ditatompel/xmr-remote-nodes/internal/ip/geo"
 )
 
 type QueryLogs struct {
@@ -308,7 +308,8 @@ func (r *moneroRepo) ProcessJob(report ProbeReport, proberId int64) error {
 			city = ?,
 			last_checked = ?,
 			last_check_status = ?,
-			cors_capable = ?
+			cors_capable = ?,
+			ipv6_only = ?
 		WHERE
 			id = ?`
 		_, err := r.db.Exec(update,
@@ -330,6 +331,7 @@ func (r *moneroRepo) ProcessJob(report ProbeReport, proberId int64) error {
 			now.Unix(),
 			statuses,
 			report.Node.CORSCapable,
+			report.Node.IPv6Only,
 			report.Node.ID)
 		if err != nil {
 			slog.Warn(err.Error())
@@ -341,10 +343,11 @@ func (r *moneroRepo) ProcessJob(report ProbeReport, proberId int64) error {
 			is_available = ?,
 			uptime = ?,
 			last_checked = ?,
-			last_check_status = ?
+			last_check_status = ?,
+			ipv6_only = ?
 		WHERE
 			id = ?`
-		if _, err := r.db.Exec(u, 0, report.Node.Uptime, now.Unix(), statuses, report.Node.ID); err != nil {
+		if _, err := r.db.Exec(u, 0, report.Node.Uptime, now.Unix(), statuses, report.Node.IPv6Only, report.Node.ID); err != nil {
 			slog.Warn(err.Error())
 		}
 	}