d5ef3de64c
- Parallel resolver to resolve multiple hosts - Repeat resolver to repeat resolution for a single host - Additional parameters for fault toleration - Do not update servers if e.g. > 10% DNS resolutions failed - resolver package in updater package
107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
package updater
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import (
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"context"
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"fmt"
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"net/http"
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"sort"
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"time"
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"github.com/qdm12/gluetun/internal/models"
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"github.com/qdm12/gluetun/internal/updater/resolver"
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)
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func (u *updater) updatePrivado(ctx context.Context) (err error) {
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servers, warnings, err := findPrivadoServersFromZip(ctx, u.client, u.presolver)
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if u.options.CLI {
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for _, warning := range warnings {
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u.logger.Warn("Privado: %s", warning)
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}
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}
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if err != nil {
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return fmt.Errorf("cannot update Privado servers: %w", err)
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}
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if u.options.Stdout {
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u.println(stringifyPrivadoServers(servers))
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}
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u.servers.Privado.Timestamp = u.timeNow().Unix()
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u.servers.Privado.Servers = servers
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return nil
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}
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func findPrivadoServersFromZip(ctx context.Context, client *http.Client, presolver resolver.Parallel) (
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servers []models.PrivadoServer, warnings []string, err error) {
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const zipURL = "https://privado.io/apps/ovpn_configs.zip"
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contents, err := fetchAndExtractFiles(ctx, client, zipURL)
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if err != nil {
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return nil, nil, err
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}
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hosts := make([]string, 0, len(contents))
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for fileName, content := range contents {
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hostname, warning, err := extractHostFromOVPN(content)
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if len(warning) > 0 {
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warnings = append(warnings, warning)
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}
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if err != nil {
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return nil, warnings, fmt.Errorf("%w in %q", err, fileName)
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}
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hosts = append(hosts, hostname)
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}
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const (
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maxFailRatio = 0.1
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maxDuration = 3 * time.Second
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maxNoNew = 1
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maxFails = 2
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)
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settings := resolver.ParallelSettings{
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MaxFailRatio: maxFailRatio,
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Repeat: resolver.RepeatSettings{
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MaxDuration: maxDuration,
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MaxNoNew: maxNoNew,
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MaxFails: maxFails,
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SortIPs: true,
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},
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}
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hostToIPs, newWarnings, err := presolver.Resolve(ctx, hosts, settings)
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warnings = append(warnings, newWarnings...)
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if err != nil {
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return nil, warnings, err
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}
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for hostname, IPs := range hostToIPs {
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switch len(IPs) {
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case 0:
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warning := fmt.Sprintf("no IP address found for host %q", hostname)
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warnings = append(warnings, warning)
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continue
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case 1:
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default:
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warning := fmt.Sprintf("more than one IP address found for host %q", hostname)
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warnings = append(warnings, warning)
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}
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server := models.PrivadoServer{
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Hostname: hostname,
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IP: IPs[0],
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}
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servers = append(servers, server)
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}
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sort.Slice(servers, func(i, j int) bool {
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return servers[i].Hostname < servers[j].Hostname
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})
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return servers, warnings, nil
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}
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func stringifyPrivadoServers(servers []models.PrivadoServer) (s string) {
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s = "func PrivadoServers() []models.PrivadoServer {\n"
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s += " return []models.PrivadoServer{\n"
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for _, server := range servers {
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s += " " + server.String() + ",\n"
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}
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s += " }\n"
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s += "}"
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return s
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}
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