Maint: deduplicate ProtonVPN servers by entry IP

internal/updater/providers/protonvpn/iptoserver.go

@@ -0,0 +1,37 @@
+package protonvpn
+
+import (
+	"net"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+type ipToServer map[string]models.ProtonvpnServer
+
+func (its ipToServer) add(country, region, city, name, hostname string,
+	entryIP, exitIP net.IP) {
+	key := entryIP.String()
+
+	server, ok := its[key]
+	if !ok {
+		server.Country = country
+		server.Region = region
+		server.City = city
+		server.Name = name
+		server.Hostname = hostname
+		server.EntryIP = entryIP
+		server.ExitIPs = []net.IP{exitIP}
+	} else {
+		server.ExitIPs = append(server.ExitIPs, exitIP)
+	}
+
+	its[key] = server
+}
+
+func (its ipToServer) toServersSlice() (servers []models.ProtonvpnServer) {
+	servers = make([]models.ProtonvpnServer, 0, len(its))
+	for _, server := range its {
+		servers = append(servers, server)
+	}
+	return servers
+}