use channel for status messages

pkg/epoch/update.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"slices"
 	"strings"
 )
 
@@ -17,20 +18,25 @@ type UpdateStats struct {
 	Updated    int
 	Current    int
 	Outdated   int
-	LogMessages []string
 	Error      error
+	MessageBuf []string
 }
 
 func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) UpdateStats {
 	stats := UpdateStats{
-		LogMessages: make([]string, 0),
 		Error:      nil,
+		MessageBuf: make([]string, 0),
 	}
 
+	msgChan := make(chan string)
+	done := make(chan bool)
+
+	go func() {
 		manifest, err := GetManifest()
 		if err != nil {
 			stats.Error = fmt.Errorf("Failed to get manifest: %v\n", err)
-		return stats
+			done <- true
+			return
 		}
 
 		for _, file := range manifest.Files {
@@ -43,7 +49,8 @@ func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) Up
 				err = os.MkdirAll(localDir, 0755)
 				if err != nil {
 					stats.Error = fmt.Errorf("failed to create directory %s: %v", localDir, err)
-				return stats
+					done <- true
+					return
 				}
 			}
 
@@ -52,12 +59,13 @@ func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) Up
 					data, err := os.ReadFile(localPath)
 					if err != nil {
 						stats.Error = fmt.Errorf("failed to read %s: %v", localPath, err)
-					return stats
+						done <- true
+						return
 					}
 					hashBytes := md5.Sum(data)
 					hash := hex.EncodeToString(hashBytes[:])
 					if hash == file.Hash {
-					stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("File %s is up to date", localPath))
+						msgChan <- fmt.Sprintf("File %s is up to date", localPath)
 						stats.Current += 1
 						continue
 					} else {
@@ -70,7 +78,8 @@ func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) Up
 				outFile, err := os.Create(localPath)
 				if err != nil {
 					stats.Error = fmt.Errorf("failed to create file %s: %v", localPath, err)
-				return stats
+					done <- true
+					return
 				}
 
 				downloadSuccess := false
@@ -80,32 +89,33 @@ func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) Up
 						if resp != nil {
 							resp.Body.Close()
 						}
-					stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("Failed to download %s: %v", url, err))
+						msgChan <- fmt.Sprintf("Failed to download %s: %v", url, err)
 						continue
 					}
 					if resp.StatusCode != http.StatusOK {
 						resp.Body.Close()
-					stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("HTTP Status %d", resp.StatusCode))
+						msgChan <- fmt.Sprintf("HTTP Status %d", resp.StatusCode)
 						continue
 					}
 
 					_, err = io.Copy(outFile, resp.Body)
 					if err != nil {
-					stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("Failed to write file %s: %v", localPath, err))
+						msgChan <- fmt.Sprintf("Failed to write file %s: %v", localPath, err)
 						resp.Body.Close()
 						continue
 					}
 
 					resp.Body.Close()
 					downloadSuccess = true
-				stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("Successfully downloaded %s", localPath))
+					msgChan <- fmt.Sprintf("Successfully downloaded %s", localPath)
 					break
 				}
 
 				outFile.Close()
 				if !downloadSuccess {
 					stats.Error = fmt.Errorf("Failed to download updates, see above messages")
-				return stats
+					done <- true
+					return
 				}
 
 				stats.Updated += 1
@@ -125,27 +135,33 @@ func Update(wowdir string, force bool, removeUnknown bool, skipDownload bool) Up
 			err = filepath.WalkDir(filepath.Join(wowdir, "Data"), func(path string, d fs.DirEntry, err error) error {
 				if !d.IsDir() && patchreg.MatchString(d.Name()) {
 					del := true
-				for _, patch := range patches {
-					if patch == d.Name() {
+					if slices.Contains(patches, d.Name()) {
 						del = false
-						break
-					}
 					}
 					if del {
 						err = os.Remove(path)
 						if err != nil {
 							return err
 						}
-					stats.LogMessages = append(stats.LogMessages, fmt.Sprintf("Removed unknown patch %s", d.Name()))
+						msgChan <- fmt.Sprintf("Removed unknown patch %s", d.Name())
 					}
 				}
 				return nil
 			})
-
 			if err != nil {
 				stats.Error = fmt.Errorf("failed to delete unknown patches: %v", err)
 			}
 		}
+		done <- true
+	}()
 
+	for {
+		select {
+		case msg := <-msgChan:
+			fmt.Println(msg)
+			stats.MessageBuf = append(stats.MessageBuf, msg)
+		case <-done:
 			return stats
 		}
+	}
+}