read & print test SIP messages

main.go

@@ -2,8 +2,67 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"strings"
 )
 
 func main() {
-	fmt.Println("Hello, I'm the SIP Parser!")
+	content, errChan := readTestFiles("./sip_messages")
+	printMessages(content, errChan)
+}
+
+// readTestFiles reads all files in the given directory that start with "test" and sends their content to the output channel.
+// If an error occurs, it sends the error to the error channel.
+func readTestFiles(directory string) (<-chan string, <-chan error) {
+	output := make(chan string)
+	errChan := make(chan error)
+
+	go func(output chan<- string, errChan chan<- error) {
+		defer close(output)
+		defer close(errChan)
+
+		files, err := os.ReadDir(directory)
+		if err != nil {
+			errChan <- err
+			return
+		}
+
+		for _, file := range files {
+			if !file.IsDir() && strings.HasPrefix(file.Name(), "test") {
+				content, err := os.ReadFile(directory + "/" + file.Name())
+				if err != nil {
+					errChan <- err
+					return
+				}
+				output <- fmt.Sprintf("Content of %s:\n%s\n", file.Name(), content)
+			}
+		}
+	}(output, errChan)
+
+	return output, errChan
+}
+
+// printMessages reads from the content and error channels and prints the messages to the console.
+// It stops when both channels are closed.
+func printMessages(content <-chan string, errChan <-chan error) {
+	for {
+		select {
+		case c, ok := <-content:
+			if !ok {
+				content = nil
+			} else {
+				fmt.Println(c)
+			}
+		case err, ok := <-errChan:
+			if !ok {
+				errChan = nil
+			} else {
+				fmt.Println(err)
+			}
+		}
+
+		if content == nil && errChan == nil {
+			break
+		}
+	}
 }