chore(all): move sub-packages to internal/provider

internal/provider/ivpn/updater/servers.go

@@ -0,0 +1,82 @@
+// Package ivpn contains code to obtain the server information
+// for the Surshark provider.
+package ivpn
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/qdm12/gluetun/internal/constants/vpn"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/updater/resolver"
+)
+
+var (
+	ErrNotEnoughServers = errors.New("not enough servers found")
+)
+
+func GetServers(ctx context.Context, client *http.Client,
+	presolver resolver.Parallel, minServers int) (
+	servers []models.Server, warnings []string, err error) {
+	data, err := fetchAPI(ctx, client)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed fetching API: %w", err)
+	}
+
+	hosts := make([]string, 0, len(data.Servers))
+
+	for _, serverData := range data.Servers {
+		openVPNHost := serverData.Hostnames.OpenVPN
+		if openVPNHost != "" {
+			hosts = append(hosts, openVPNHost)
+		}
+
+		wireguardHost := serverData.Hostnames.Wireguard
+		if wireguardHost != "" {
+			hosts = append(hosts, wireguardHost)
+		}
+	}
+
+	if len(hosts) < minServers {
+		return nil, nil, fmt.Errorf("%w: %d and expected at least %d",
+			ErrNotEnoughServers, len(hosts), minServers)
+	}
+
+	hostToIPs, warnings, err := resolveHosts(ctx, presolver, hosts, minServers)
+	if err != nil {
+		return nil, warnings, err
+	}
+
+	servers = make([]models.Server, 0, len(hosts))
+	for _, serverData := range data.Servers {
+		vpnType := vpn.OpenVPN
+		hostname := serverData.Hostnames.OpenVPN
+		tcp := true
+		wgPubKey := ""
+		if hostname == "" {
+			vpnType = vpn.Wireguard
+			hostname = serverData.Hostnames.Wireguard
+			tcp = false
+			wgPubKey = serverData.WgPubKey
+		}
+
+		server := models.Server{
+			VPN:      vpnType,
+			Country:  serverData.Country,
+			City:     serverData.City,
+			ISP:      serverData.ISP,
+			Hostname: hostname,
+			WgPubKey: wgPubKey,
+			TCP:      tcp,
+			UDP:      true,
+			IPs:      hostToIPs[hostname],
+		}
+		servers = append(servers, server)
+	}
+
+	sortServers(servers)
+
+	return servers, warnings, nil
+}