debugging in go

Author: marcel-dempers

.vscode/launch.json

@@ -0,0 +1,21 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Remote Docker",
+            "type": "go",
+            "request": "launch",
+            "mode": "remote",
+            "remotePath":"/go/src/work/",
+            "port": 2345,
+            "host": "127.0.0.1",
+            "program": "${workspaceFolder}/golang/src/",
+            "args": [],
+            "trace" : "verbose",
+            "env" : {}
+        }
+    ]
+}

docker-compose.yaml

@@ -14,20 +14,19 @@ services:
     - ./c#/src/:/work/
     ports:
       - 5000:5000
-  golang: #docker run -it -v ${PWD}:/work -w /work -p 5001:5000 aimvector/golang:1.0.0 /bin/sh
+  golang: #docker run -it -v ${PWD}:/go/src/work -p 5001:5000 -p 2345:2345 --security-opt "seccomp:unconfined" aimvector/golang:1.0.0
     container_name: golang
     image: aimvector/golang:1.0.0
     build: 
       context: ./golang
-      target: prod
-    #working_dir: /work      #comment out for build.target:prod
-    #entrypoint: /bin/sh     #comment out for build.target:prod
-    #stdin_open: true        #comment out for build.target:prod
-    #tty: true               #comment out for build.target:prod
+      target: debug
     volumes:
-    - ./golang/src/:/work
+    - ./golang/src/:/go/src/work/
     ports:
       - 5001:5000
+      - 2345:2345
+    security_opt:
+      - "seccomp:unconfined"
   nodejs: #docker run -it -v ${PWD}:/work -w /work -p 5002:5000 aimvector/nodejs:1.0.0 /bin/sh
     container_name: nodejs
     image: aimvector/nodejs:1.0.0

golang/dlv.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+cd /go/src/work
+dlv debug --headless --log -l 0.0.0.0:2345 --api-version=2

golang/dockerfile

@@ -1,18 +1,32 @@
-FROM golang:1.12.5-alpine3.9 as dev
-
-# installing git
-RUN apk update && apk upgrade && \
-    apk add --no-cache git
-
-RUN go get github.com/sirupsen/logrus
-RUN go get github.com/buaazp/fasthttprouter
-RUN go get github.com/valyala/fasthttp
-
-WORKDIR /work
-COPY ./src /work/
-RUN go build -o app
-###########START NEW IMAGE###################
-
-FROM alpine:3.9 as prod
-COPY --from=dev /work/app /
-CMD ./app
+FROM golang:1.12.5-alpine3.9 as debug
+
+# installing git
+RUN apk update && apk upgrade && \
+    apk add --no-cache git \
+        dpkg \
+        gcc \
+        git \
+        musl-dev
+
+ENV GOPATH /go
+ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+
+RUN go get github.com/sirupsen/logrus
+RUN go get github.com/buaazp/fasthttprouter
+RUN go get github.com/valyala/fasthttp
+RUN go get github.com/go-delve/delve/cmd/dlv
+
+WORKDIR /go/src/work
+COPY ./src /go/src/work/
+
+RUN go build -o app
+### Run the Delve debugger ###
+COPY ./dlv.sh /
+RUN chmod +x /dlv.sh 
+ENTRYPOINT [ "/dlv.sh"]
+
+###########START NEW IMAGE###################
+
+FROM alpine:3.9 as prod
+COPY --from=debug /go/src/work/app /
+CMD ./app

golang/src/main.go

@@ -8,14 +8,12 @@ import (
 	"github.com/valyala/fasthttp"
 )
 
-var searchMock []byte
-
 func Response(ctx *fasthttp.RequestCtx) {
 	fmt.Fprintf(ctx, "Hello") 
 }
 func main() {
 
-	fmt.Println("starting.")
+	fmt.Println("starting...")
 
 	router := fasthttprouter.New()
 	router.GET("/", Response)