Add network test

internal/app.go

@@ -52,6 +52,17 @@ func MainApp(configPath string) {
 		os.Exit(1)
 	}
 
+	repo := http.NewIPRepository(log.Named("network_test"))
+	repoClient := http.NewHTTPClient(
+		"",
+		0,
+		1,
+		true,
+		config,
+		log.Named("network_test"),
+	)
+	repo.NetworkTest(repoClient, false)
+
 	apiClient := http.NewHTTPClient(
 		config.GetToken(),
 		config.GetRetriesUntilFailed(), // default retries = 2
@@ -74,7 +85,7 @@ func MainApp(configPath string) {
 		"",                              // no token required for download client
 		config.GetRetriesUntilFailed(),  //
 		config.GetDownloadTimeoutSecs(), //
-		true,                            // download client supports ipv6
+		true,                            // set as download client
 		config,
 		log.Named("download_client"),
 	)

internal/torrent/manager.go

@@ -258,9 +258,6 @@ func (t *TorrentManager) applyMediaInfoDetails(torrent *Torrent) {
 func (t *TorrentManager) readTorrentFromFile(filePath string) *Torrent {
 	file, err := os.Open(filePath)
 	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		}
 		return nil
 	}
 	defer file.Close()
@@ -318,9 +315,6 @@ func (t *TorrentManager) readInfoFromFile(torrentID string) *realdebrid.TorrentI
 	filePath := "data/info/" + torrentID + ".zurginfo"
 	file, err := os.Open(filePath)
 	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		}
 		return nil
 	}
 	defer file.Close()

pkg/http/client.go

@@ -29,18 +29,13 @@ type HTTPClient struct {
 	timeoutSecs      int
 	backoff          func(attempt int) time.Duration
 	bearerToken      string
-	supportIPv6 bool
+	isDownloadClient bool
 	cfg              config.ConfigInterface
 	ipv6             cmap.ConcurrentMap[string, string]
 	ipv6Hosts        []string
 	log              *logutil.Logger
 }
 
-// {
-// "error": "infringing_file",
-// "error_code": 35
-// }
-
 type ApiErrorResponse struct {
 	Message string `json:"error"`
 	Code    int    `json:"error_code"`
@@ -54,7 +49,7 @@ func NewHTTPClient(
 	token string,
 	maxRetries int,
 	timeoutSecs int,
-	supportIPv6 bool,
+	isDownloadClient bool,
 	cfg config.ConfigInterface,
 	log *logutil.Logger,
 ) *HTTPClient {
@@ -64,7 +59,7 @@ func NewHTTPClient(
 		maxRetries:       maxRetries,
 		timeoutSecs:      timeoutSecs,
 		backoff:          backoffFunc,
-		supportIPv6: supportIPv6,
+		isDownloadClient: isDownloadClient,
 		cfg:              cfg,
 		ipv6:             cmap.New[string](),
 		log:              log,
@@ -217,7 +212,7 @@ func (r *HTTPClient) Do(req *http.Request) (*http.Response, error) {
 
 func (r *HTTPClient) replaceWithIPv6Host(req *http.Request) {
 	// don't replace host if IPv6 is not supported or not forced
-	if !r.supportIPv6 || !r.cfg.ShouldForceIPv6() {
+	if !r.isDownloadClient || !r.cfg.ShouldForceIPv6() {
 		return
 	}
 	// this host should be replaced

pkg/http/ip.go

@@ -0,0 +1,202 @@
+package http
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"math/rand"
+	"net"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/debridmediamanager/zurg/pkg/logutil"
+)
+
+type IPRepository struct {
+	ipv4       []string
+	ipv6       []string
+	latencyMap map[string]float64
+	log        *logutil.Logger
+}
+
+func NewIPRepository(log *logutil.Logger) *IPRepository {
+	repo := &IPRepository{
+		ipv4:       []string{},
+		ipv6:       []string{},
+		latencyMap: make(map[string]float64),
+		log:        log,
+	}
+
+	repo.lookupDomains()
+
+	return repo
+}
+
+func (r *IPRepository) NetworkTest(downloadClient *HTTPClient, forceRun bool) {
+	latencyFile := "data/latency.json"
+	if !forceRun {
+		latencyData := r.readLatencyFile(latencyFile)
+		if latencyData != nil {
+			r.latencyMap = *latencyData
+			return
+		}
+	}
+
+	r.log.Info("Network test will start now. Note that it will only run once and record the latency of each domain for future use.")
+	r.latencyTest(downloadClient)
+	r.log.Infof("Network test completed. Saving the results to %s", latencyFile)
+	r.writeLatencyFile(latencyFile)
+}
+
+func (r *IPRepository) lookupDomains() {
+	limit := 99
+	increment := 10
+	start := 0
+	for {
+		lastDomainWorked := false
+		for i := start; i <= limit; i++ {
+			domain := fmt.Sprintf("%d.download.real-debrid.com", i)
+			ips, err := net.LookupIP(domain)
+			if err == nil && len(ips) > 0 {
+				hasIPv6 := false
+				for _, ip := range ips {
+					if ip.To4() == nil {
+						hasIPv6 = true
+					}
+				}
+				// assume it always has ipv4
+				r.ipv4 = append(r.ipv4, domain)
+				if hasIPv6 {
+					r.ipv6 = append(r.ipv6, domain)
+				}
+				if i == limit {
+					lastDomainWorked = true
+				}
+			}
+
+			domain2 := fmt.Sprintf("%d.download.real-debrid.cloud", i)
+			ips2, err := net.LookupIP(domain2)
+			if err == nil && len(ips2) > 0 {
+				hasIPv6 := false
+				for _, ip := range ips {
+					if ip.To4() == nil {
+						hasIPv6 = true
+					}
+				}
+				r.ipv4 = append(r.ipv4, domain2)
+				if hasIPv6 {
+					r.ipv6 = append(r.ipv6, domain2)
+				}
+				if i == limit {
+					lastDomainWorked = true
+				}
+			}
+		}
+		if lastDomainWorked {
+			start = limit + 1
+			limit += increment
+		} else {
+			break
+		}
+	}
+
+	r.log.Infof("Found %d IPv4 domains and %d IPv6 domains", len(r.ipv4), len(r.ipv6))
+}
+
+func (r *IPRepository) latencyTest(downloadClient *HTTPClient) {
+	const testFileSize = 1
+	const iterations = 3
+
+	for _, domain := range r.ipv4 {
+		url := fmt.Sprintf("https://%s/speedtest/test.rar/%f", domain, rand.Float64())
+
+		var totalDuration float64
+		hasError := false
+		for i := 0; i < iterations; i++ {
+			ctx, cancel := context.WithTimeout(context.Background(), iterations*time.Second)
+			defer cancel()
+
+			req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+			if err != nil {
+				r.log.Warnf("Failed to create request for %s: %v", domain, err)
+				hasError = true
+				break
+			}
+
+			headers := make(http.Header)
+			headers.Set("Range", fmt.Sprintf("bytes=0-%d", testFileSize-1))
+			req.Header = headers
+
+			start := time.Now()
+			resp, err := downloadClient.Do(req)
+			if err != nil {
+				r.log.Warnf("Failed to download from %s: %v", domain, err)
+				hasError = true
+				break
+			}
+
+			limitedReader := io.LimitReader(resp.Body, testFileSize)
+
+			_, err = io.Copy(io.Discard, limitedReader)
+			resp.Body.Close()
+
+			if err != nil && err != io.EOF {
+				r.log.Warnf("Failed to read from %s: %v", domain, err)
+				hasError = true
+				break
+			}
+
+			duration := time.Since(start).Seconds()
+			totalDuration += duration
+		}
+		if hasError {
+			continue
+		}
+
+		r.latencyMap[domain] = totalDuration / 3
+
+		r.log.Debugf("Latency from %s: %.5f seconds", domain, r.latencyMap[domain])
+	}
+}
+
+func (r *IPRepository) readLatencyFile(latencyFile string) *map[string]float64 {
+	if _, err := os.Stat(latencyFile); err == nil {
+		file, err := os.Open(latencyFile)
+		if err != nil {
+			return nil
+		}
+		defer file.Close()
+		jsonData, err := io.ReadAll(file)
+		if err != nil {
+			return nil
+		}
+		var latencyMap map[string]float64
+		if err := json.Unmarshal(jsonData, &latencyMap); err != nil {
+			return nil
+		}
+		return &latencyMap
+	}
+	return nil
+}
+
+func (r *IPRepository) writeLatencyFile(latencyFile string) {
+	file, err := os.Create(latencyFile)
+	if err != nil {
+		r.log.Warnf("Cannot create latency file %s: %v", latencyFile, err)
+		return
+	}
+	defer file.Close()
+
+	jsonData, err := json.Marshal(r.latencyMap)
+	if err != nil {
+		r.log.Warnf("Cannot marshal latency map: %v", err)
+		return
+	}
+
+	if _, err := file.Write(jsonData); err != nil {
+		r.log.Warnf("Cannot write to latency file %s: %v", latencyFile, err)
+		return
+	}
+}