Debugging Go Code

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$ mkdir -p $GOPATH/src/github.com/myusername/project && cd "$_"

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$ go get -u github.com/go-delve/delve/cmd/dlv

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$ cat $GOPATH/src/github.com/username/proj/main.go

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package main
 
import (
    "fmt"
    "log"
    "net/http"
    "os"
)
 
const port  = "8000"

func main() {
    http.HandleFunc("/hi", hi)

    fmt.Println("runing on port: " + port)
    log.Fatal(http.ListenAndServe(":" + port, nil))
}

func hi(w http.ResponseWriter, r *http.Request) {
    hostName, _ := os.Hostname()
    fmt.Fprintf(w, "HostName: %s", hostName)
}

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$ dlv debug ./main.go

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(dlv) help

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(dlv) b main.main

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(dlv) c

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(dlv) b main.hi

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(dlv) c
running on port: 8000

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curl localhost:8000/hi

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$ go build main.go
$ ./main
$ ps aux|grep main

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dlv attach pid [executable]

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(dlv) b /home/ye/go/src/github.com/username/proj/main.go:20

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curl localhost:8000/hi

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break packageName.funcName