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

internal/provider/expressvpn/updater/servers.go

@@ -0,0 +1,56 @@
+// package expressvpn contains code to obtain the server information
+// for the ExpressVPN provider.
+package expressvpn
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/qdm12/gluetun/internal/constants/vpn"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/updater/resolver"
+	"github.com/qdm12/gluetun/internal/updater/unzip"
+)
+
+var ErrNotEnoughServers = errors.New("not enough servers found")
+
+func GetServers(ctx context.Context, unzipper unzip.Unzipper,
+	presolver resolver.Parallel, minServers int) (
+	servers []models.Server, warnings []string, err error) {
+	servers = hardcodedServers()
+
+	hosts := make([]string, len(servers))
+	for i := range servers {
+		hosts[i] = servers[i].Hostname
+	}
+
+	hostToIPs, newWarnings, err := resolveHosts(ctx, presolver, hosts, minServers)
+	warnings = append(warnings, newWarnings...)
+	if err != nil {
+		return nil, warnings, err
+	}
+
+	i := 0
+	for _, server := range servers {
+		hostname := server.Hostname
+		server.IPs = hostToIPs[hostname]
+		if len(server.IPs) == 0 {
+			continue
+		}
+		server.VPN = vpn.OpenVPN
+		server.UDP = true // no TCP support
+		servers[i] = server
+		i++
+	}
+	servers = servers[:i]
+
+	if len(servers) < minServers {
+		return nil, warnings, fmt.Errorf("%w: %d and expected at least %d",
+			ErrNotEnoughServers, len(servers), minServers)
+	}
+
+	sortServers(servers)
+
+	return servers, warnings, nil
+}