Первый блин комом

.gitignore

@@ -21,3 +21,7 @@
 # Go workspace file
 go.work
 
+#Images dir
+images/
+
+main

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.22-alpine
+
+WORKDIR /app
+
+VOLUME /app/images
+
+EXPOSE 3666
+
+COPY main.go ./
+
+RUN go build main.go
+
+CMD ["/app/main"]
+

docker-compose.yml

@@ -0,0 +1,9 @@
+version: "3"
+
+services:
+  picran:
+    build: .
+    ports:
+      - "3666:3666"
+    volumes:
+      - "./images:/app/images"

main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"math/rand"
+	"net/http"
+	"os"
+)
+
+func GetPicsArray() []string {
+	files, err := os.ReadDir("images")
+	if err != nil {
+		panic(err)
+	}
+	if len(files) == 0 {
+		return []string{"no images"}
+	}
+	var filesNames = make([]string, len(files))
+	for i, file := range files {
+		filesNames[i] = string(file.Name())
+	}
+	return filesNames
+}
+
+func GetRandImg() string {
+	picsArray := GetPicsArray()
+	return picsArray[rand.Intn(len(picsArray))]
+}
+
+func ReturnPic(w http.ResponseWriter, req *http.Request) {
+	picture, _ := os.Open(fmt.Sprintf("images/%v", GetRandImg()))
+	var pictureReader io.Reader = picture
+	io.Copy(w, pictureReader)
+	log.Println("Картинка отдана")
+}
+
+func main() {
+	log.Println("Server Start")
+	http.HandleFunc("/", ReturnPic)
+	http.ListenAndServe(":3666", nil)
+}