Gin dlv debugger doesn't work with my docker and vscode configuration

Getting Help
1

I try to setup dev environment for Gin framework using docker and vscode. I can’t figure why the breakpoint is visible in the debug console but it does not have effect. In docker I’m getting successful response but breakpoint didn’t work: library-go-backend-1 | [GIN] 2024/07/21 - 10:06:11 | 200 | 440.125µs | 192.168.65.1 | GET "/"
I tried to change ports or use different options in my setup but still no clue

Here is my setup:
Dockerfile

FROM golang:1.22.1 AS builder
WORKDIR /app/
COPY . .
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o main .
#dlv
RUN CGO_ENABLED=0 go install -ldflags "-s -w -extldflags '-static'" github.com/go-delve/delve/cmd/dlv@latest

FROM alpine:latest
WORKDIR /app/
COPY --from=builder /app/main main
COPY --from=builder /go/bin/dlv /dlv

CMD ["/dlv", "--listen=:8081",  "--headless=true", "--continue", "--accept-multiclient", "--headless=true", "--api-version=2", "exec", "./main"]

docker-compose.yaml

services:
  library-go-backend:
    build: .
    ports:
      - 8080:8080
      - 8081:8081
    volumes:
      # - ./src:/app
      - ~/.dlv:/root/.dlv

.vscode/lanuch.json

{
    "version": "0.2.0",
    "configurations": [
        {
			"name": "Launch",
			//"processId": 36840,
			"type": "go",
			"request": "attach",
			"mode": "remote",
			//"remotePath": "${workspaceRoot}/main.go",
			"port": 8081,
			"host": "127.0.0.1",
			"showLog": true,
			"trace": "log",
			"logOutput": "rpc""
        }
    ]
}

and the program is very simple:

package main

import (
	"fmt"
	"net/http"
	"pbuf/models"

	"github.com/gin-gonic/gin"
)

func sayOk(c *gin.Context) {
	fmt.Println(2 + 2) //<-breakpoint didn't work
	c.JSON(http.StatusOK, gin.H{
		"status": "ok",
	})
}

func GetDBContentTags(c *gin.Context) {
	contentTags := models.ListContentTags()
	c.JSON(http.StatusOK, contentTags)
}

func main() {
	router := gin.Default() // <- breakpoint didn't work 
	router.StaticFile("/content_tag.proto", "./content_tag.proto")
	//router.GET("/albums", getAlbums)
	router.GET("/", sayOk)
	router.GET("/content_tags", GetDBContentTags)

	router.Run()
}

here are some extra logs from vscode debug console:

DisconnectRequest
Closing Delve.
Remote Debugging: close dlv connection.
DisconnectRequest to parent to shut down protocol server.
DisconnectResponse
Verbose logs are written to:
/var/folders/pl/md29lpmn1bn5cv11vk1s_wk80000gn/T/vscode-go-debug.txt
InitializeRequest
InitializeResponse
AttachRequest
Start remote debugging: connecting 127.0.0.1:8081
InitializeEvent
ConfigurationDoneRequest
ConfigurationDoneResponse {"seq":12,"type":"response","request_seq":3,"command":"configurationDone","success":true}
SetBreakPointsRequest
Halting before setting breakpoints. SkipStopEventOnce is false.
All cleared
Creating on: /Users/tomasz/pbuf/main.go:19
All set:[{"Breakpoint":{"id":60,"name":"","addr":7225507,"addrs":[7225507],"addrpid":[11],"file":"/app/main.go","line":19,"functionName":"main.GetDBContentTags","ExprString":"","Cond":"","HitCond":"","HitCondPerG":false,"continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"LoadLocals":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"WatchExpr":"","WatchType":0,"hitCount":{},"totalHitCount":0,"disabled":false,"RootFuncName":"","TraceFollowCalls":0}}]
SetBreakPointsResponse

I send

  • curl localhost:8080 which results with {"status":"ok"}
  • curl localhost:8081 → curl: (52) Empty reply from server