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

internal/provider/surfshark/updater/servers.go

@@ -0,0 +1,56 @@
+// Package surfshark contains code to obtain the server information
+// for the Surshark provider.
+package surfshark
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"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,
+	client *http.Client, presolver resolver.Parallel, minServers int) (
+	servers []models.Server, warnings []string, err error) {
+	hts := make(hostToServer)
+
+	err = addServersFromAPI(ctx, client, hts)
+	if err != nil {
+		return nil, nil, fmt.Errorf("cannot fetch server information from API: %w", err)
+	}
+
+	warnings, err = addOpenVPNServersFromZip(ctx, unzipper, hts)
+	if err != nil {
+		return nil, nil, fmt.Errorf("cannot get OpenVPN ZIP file: %w", err)
+	}
+
+	getRemainingServers(hts)
+
+	hosts := hts.toHostsSlice()
+	hostToIPs, newWarnings, err := resolveHosts(ctx, presolver, hosts, minServers)
+	warnings = append(warnings, newWarnings...)
+	if err != nil {
+		return nil, warnings, err
+	}
+
+	hts.adaptWithIPs(hostToIPs)
+
+	servers = hts.toServersSlice()
+
+	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
+}