multi response capabilitys added

main.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"sync"
 	"time"
 )
 
@@ -19,7 +20,6 @@ type Message struct {
 	To      string `json:"to"`
 }
 
-// Note: The StreamResponse structure simplified for demonstration. Adjust according to actual requirements.
 type StreamResponse struct {
 	From      string `json:"from"`
 	To        string `json:"to"`
@@ -44,7 +44,6 @@ func createStreamResponse(fromLanguage, toLanguage, message string) string {
 }
 
 func streamResponse(w http.ResponseWriter, fromLanguage, toLanguage string, messages <-chan string) {
-	// Set headers for SSE
 	w.Header().Set("Content-Type", "text/event-stream")
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Connection", "keep-alive")
@@ -58,20 +57,16 @@ func streamResponse(w http.ResponseWriter, fromLanguage, toLanguage string, mess
 	for msg := range messages {
 		formattedMessage := createStreamResponse(fromLanguage, toLanguage, msg)
 		fmt.Fprintf(w, " %s\n\n", formattedMessage)
-		flusher.Flush() // Ensure client receives the update immediately
+		flusher.Flush()
 	}
 }
 
 func downloadPackages(w http.ResponseWriter, fromLanguage, toLanguage string) {
-
-	// Create a channel to send messages from the download process
 	messages := make(chan string)
 	defer close(messages)
 
-	// Use a goroutine for streaming responses so we can proceed with the download
 	go streamResponse(w, fromLanguage, toLanguage, messages)
 
-	// Start the python command in the background
 	cmd := exec.Command(linux, "translator/download.py", fromLanguage, toLanguage)
 	output, err := cmd.StdoutPipe()
 	if err != nil {
@@ -85,10 +80,8 @@ func downloadPackages(w http.ResponseWriter, fromLanguage, toLanguage string) {
 		return
 	}
 
-	// Initial message sent to the channel for streaming
 	messages <- "Download started..."
 
-	// Start a ticker to send "..." every few seconds until we get real output
 	ticker := time.NewTicker(2 * time.Second)
 	go func() {
 		for range ticker.C {
@@ -96,19 +89,16 @@ func downloadPackages(w http.ResponseWriter, fromLanguage, toLanguage string) {
 		}
 	}()
 
-	// Read the output of the python command and send it to the channel
 	scanner := bufio.NewScanner(output)
 	firstOutputReceived := false
 	for scanner.Scan() {
 		if !firstOutputReceived {
-			// Stop the ticker after receiving the first real output
 			ticker.Stop()
 			firstOutputReceived = true
 		}
 		messages <- scanner.Text()
 	}
 
-	// Wait for the command to complete
 	err = cmd.Wait()
 	if err != nil {
 		messages <- fmt.Sprintf("Error waiting for Download: %s", err.Error())
@@ -117,14 +107,10 @@ func downloadPackages(w http.ResponseWriter, fromLanguage, toLanguage string) {
 }
 
 func executeTranslator(w http.ResponseWriter, message, fromLanguage, toLanguage string) {
-	// Create a message channel for streaming translation results
 	messages := make(chan string)
 	defer close(messages)
 
-	// A goroutine will manage sending streamed responses
 	go streamResponse(w, fromLanguage, toLanguage, messages)
-
-	// Start the python command in the background
 	cmd := exec.Command(linux, "translator/translate.py", message, fromLanguage, toLanguage)
 	output, err := cmd.StdoutPipe()
 	if err != nil {
@@ -138,13 +124,11 @@ func executeTranslator(w http.ResponseWriter, message, fromLanguage, toLanguage
 		return
 	}
 
-	// Read the output of the python command and send it through the channel
 	scanner := bufio.NewScanner(output)
 	for scanner.Scan() {
-		messages <- scanner.Text() // Sends each line of the output to the stream
+		messages <- scanner.Text()
 	}
 
-	// Wait for the command to complete
 	err = cmd.Wait()
 	if err != nil {
 		messages <- fmt.Sprintf("Error waiting for Translation: %s", err.Error())
@@ -153,27 +137,24 @@ func executeTranslator(w http.ResponseWriter, message, fromLanguage, toLanguage
 }
 
 func CheckLanguagesInstalled(fromCode, toCode string) (bool, error) {
-	// Construct the target directory path
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
 		return false, fmt.Errorf("unable to determine the user home directory: %w", err)
 	}
 	targetDir := filepath.Join(homeDir, ".local", "share", "argos-translate", "packages", fromCode+"_"+toCode)
 
-	// Check if the directory exists
 	_, err = os.Stat(targetDir)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return false, nil // Directory does not exist, indicating the language pair is not installed
+			return false, nil
 		}
 		return false, fmt.Errorf("error checking for language directory: %w", err)
 	}
 
-	// The directory exists, indicating the language pair is installed
 	return true, nil
 }
+
 func handleRequest(w http.ResponseWriter, r *http.Request) {
-	// Read the request body
 	if r.Header.Get("Content-Type") != "application/json" {
 		http.Error(w, "Request content type must be application/json", http.StatusBadRequest)
 		return
@@ -185,7 +166,6 @@ func handleRequest(w http.ResponseWriter, r *http.Request) {
 	}
 	defer r.Body.Close()
 
-	// Unmarshal the JSON data
 	var msg Message
 	err = json.Unmarshal(body, &msg)
 	if err != nil {
@@ -193,37 +173,42 @@ func handleRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Check if From and To fields are not longer than 2 letters
 	if len(msg.From) > 2 || len(msg.To) > 2 {
 		http.Error(w, "From and To fields should not be longer than 2 letters.", http.StatusBadRequest)
 		return
-	} else {
-		installed, err := CheckLanguagesInstalled(msg.From, msg.To)
-		if err != nil {
-			if err.Error() == "file not found" {
-				http.Error(w, "file not found "+err.Error(), http.StatusInternalServerError)
-			} else {
-				fmt.Println("An error occurred:", err)
-			}
-			return
+	}
+
+	installed, err := CheckLanguagesInstalled(msg.From, msg.To)
+	if err != nil {
+		if err.Error() == "file not found" {
+			http.Error(w, "file not found "+err.Error(), http.StatusInternalServerError)
+		} else {
+			fmt.Println("An error occurred:", err)
 		}
+		return
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	go func() {
+		defer wg.Done()
 		if installed {
 			executeTranslator(w, msg.Message, msg.From, msg.To)
 		} else {
 			downloadPackages(w, msg.From, msg.To)
 		}
-	}
+	}()
+
+	wg.Wait()
 }
 
 func main() {
-	// Define the HTTP handler function
-	http.HandleFunc("/", handleRequest) // This ensures all requests are routed to handleRequest
+	http.HandleFunc("/", handleRequest)
 
-	// Define the port
 	port := "53184"
 	address := fmt.Sprintf("0.0.0.0:%s", port)
 
-	// Start the HTTP server
 	fmt.Printf("Listening on %s...\n", address)
 	err := http.ListenAndServe(address, nil)
 	if err != nil {