Feature: multiple IP addresses per PIA server

internal/updater/providers/pia/hosttoserver.go

@@ -0,0 +1,55 @@
+package pia
+
+import (
+	"net"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+type nameToServer map[string]models.PIAServer
+
+func (nts nameToServer) add(name, hostname, region string,
+	tcp, udp, portForward bool, ip net.IP) (change bool) {
+	server, ok := nts[name]
+	if !ok {
+		change = true
+		server.ServerName = name
+		server.Hostname = hostname
+		server.Region = region
+		server.PortForward = portForward
+	}
+
+	if !server.TCP && tcp {
+		change = true
+		server.TCP = tcp
+	}
+	if !server.UDP && udp {
+		change = true
+		server.UDP = udp
+	}
+
+	ipFound := false
+	for _, existingIP := range server.IPs {
+		if ip.Equal(existingIP) {
+			ipFound = true
+			break
+		}
+	}
+
+	if !ipFound {
+		change = true
+		server.IPs = append(server.IPs, ip)
+	}
+
+	nts[name] = server
+
+	return change
+}
+
+func (nts nameToServer) toServersSlice() (servers []models.PIAServer) {
+	servers = make([]models.PIAServer, 0, len(nts))
+	for _, server := range nts {
+		servers = append(servers, server)
+	}
+	return servers
+}