refactor: move more commands to internal/cmd (#207)

* refactor: move more commands to internal/cmd

Part of https://github.com/ooni/probe/issues/1335.

We would like all commands to be at the same level of engine
rather than inside engine (now that we can do it).

* fix: update .gitignore

* refactor: also move jafar outside engine

* We should be good now?

internal/engine/cmd/oohelperd/oohelperd.go

@@ -1,67 +0,0 @@
-// Command oohelperd contains the Web Connectivity test helper.
-package main
-
-import (
-	"context"
-	"flag"
-	"net/http"
-	"sync"
-	"time"
-
-	"github.com/apex/log"
-	"github.com/ooni/probe-cli/v3/internal/engine/cmd/oohelperd/internal"
-	"github.com/ooni/probe-cli/v3/internal/engine/netx"
-)
-
-const maxAcceptableBody = 1 << 24
-
-var (
-	dialer    netx.Dialer
-	endpoint  = flag.String("endpoint", ":8080", "Endpoint where to listen")
-	httpx     *http.Client
-	resolver  netx.Resolver
-	srvcancel context.CancelFunc
-	srvctx    context.Context
-	srvwg     = new(sync.WaitGroup)
-)
-
-func init() {
-	srvctx, srvcancel = context.WithCancel(context.Background())
-	dialer = netx.NewDialer(netx.Config{Logger: log.Log})
-	txp := netx.NewHTTPTransport(netx.Config{Logger: log.Log})
-	httpx = &http.Client{Transport: txp}
-	resolver = netx.NewResolver(netx.Config{Logger: log.Log})
-}
-
-func shutdown(srv *http.Server) {
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-	defer cancel()
-	srv.Shutdown(ctx)
-}
-
-func main() {
-	logmap := map[bool]log.Level{
-		true:  log.DebugLevel,
-		false: log.InfoLevel,
-	}
-	debug := flag.Bool("debug", false, "Toggle debug mode")
-	flag.Parse()
-	log.SetLevel(logmap[*debug])
-	testableMain()
-}
-
-func testableMain() {
-	mux := http.NewServeMux()
-	mux.Handle("/", internal.Handler{
-		Client:            httpx,
-		Dialer:            dialer,
-		MaxAcceptableBody: maxAcceptableBody,
-		Resolver:          resolver,
-	})
-	srv := &http.Server{Addr: *endpoint, Handler: mux}
-	srvwg.Add(1)
-	go srv.ListenAndServe()
-	<-srvctx.Done()
-	shutdown(srv)
-	srvwg.Done()
-}