initial commit with basic http server

.gitignore

@@ -0,0 +1 @@
+*.csv

go.mod

@@ -0,0 +1,14 @@
+module gogs.home.aneur.in/go/ultrashorty
+
+go 1.25.6
+
+require (
+	github.com/alecthomas/kong v1.14.0
+	github.com/rs/zerolog v1.35.0
+)
+
+require (
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+)

go.sum

@@ -0,0 +1,17 @@
+github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
+github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
+github.com/alecthomas/kong v1.14.0 h1:gFgEUZWu2ZmZ+UhyZ1bDhuutbKN1nTtJTwh19Wsn21s=
+github.com/alecthomas/kong v1.14.0/go.mod h1:wrlbXem1CWqUV5Vbmss5ISYhsVPkBb1Yo7YKJghju2I=
+github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
+github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
+github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
+github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
+github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/rs/zerolog v1.35.0 h1:VD0ykx7HMiMJytqINBsKcbLS+BJ4WYjz+05us+LRTdI=
+github.com/rs/zerolog v1.35.0/go.mod h1:EjML9kdfa/RMA7h/6z6pYmq1ykOuA8/mjWaEvGI+jcw=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

main.go

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+package main
+
+import (
+	"net"
+	"net/http"
+
+	"github.com/alecthomas/kong"
+	"github.com/rs/zerolog"
+)
+
+type CLI struct {
+	File string `arg:"" name:"file" short:"f" help:"Path to CSV redirects file." type:"path"`
+	Host string `name:"host" help:"HTTP listen host." default:"${host}"`
+	Port string `name:"port" short:"p" help:"HTTP listen port." default:"${port}"`
+}
+
+type HttpServer struct {
+	CLI *CLI
+	Log zerolog.Logger
+}
+
+func (srv *HttpServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	statusCode := 404
+	srv.Log.Trace().Int("result", statusCode).Msg(req.URL.Path)
+	w.WriteHeader(statusCode)
+}
+
+func main() {
+	vars := kong.Vars{
+		"host": "localhost",
+		"port": "4000",
+	}
+
+	cli := &CLI{}
+	kong.Parse(cli, vars)
+
+	srv := &HttpServer{
+		CLI: cli,
+		Log: zerolog.New(zerolog.NewConsoleWriter()).With().Timestamp().Logger(),
+	}
+
+	addr := net.JoinHostPort(cli.Host, cli.Port)
+	errc := make(chan error)
+	go func() {
+		errc <- http.ListenAndServe(addr, srv)
+	}()
+
+	srv.Log.Info().Msgf("Listening at %s", addr)
+	err := <-errc
+	panic(err)
+}