first commit

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/asedraw.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/asedraw.iml" filepath="$PROJECT_DIR$/.idea/asedraw.iml" />
+    </modules>
+  </component>
+</project>

go.mod

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+module asedraw
+
+go 1.21
+
+require github.com/gorilla/websocket v1.5.0

go.sum

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+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=

main.go

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+package main
+
+import (
+	"flag"
+	"github.com/gorilla/websocket"
+	"log"
+	"net/http"
+)
+
+var addr = flag.String("addr", "localhost:8080", "http service address")
+
+var upgrader = websocket.Upgrader{} // use default options
+
+func echo(w http.ResponseWriter, r *http.Request) {
+	c, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Print("upgrade:", err)
+		return
+	}
+	defer c.Close()
+	for {
+		mt, message, err := c.ReadMessage()
+		if err != nil {
+			log.Println("read:", err)
+			break
+		}
+		log.Printf("recv: %s", message)
+		err = c.WriteMessage(mt, message)
+		if err != nil {
+			log.Println("write:", err)
+			break
+		}
+	}
+}
+
+func main() {
+	flag.Parse()
+	log.SetFlags(0)
+	http.HandleFunc("/", echo)
+	log.Fatal(http.ListenAndServe(*addr, nil))
+}