feat: add reachview proxy utility

README.md

@@ -8,6 +8,7 @@ Librairie Golang d'interaction avec les produits [Emlid](https://emlid.com/).
 
 - [`cmd/broadcast`](./cmd/broadcast) - Affichage en flux continu des évènements transmis par un module Reach
 - [`cmd/configuration`](./cmd/configuration) - Affichage de la configuration d'un module Reach
+- [`cmd/proxy`](./cmd/proxy) - Service proxy permettant de joindre un module ReachView présent sur un autre réseau
 
 ## Licence
 

cmd/proxy/README.md

@@ -0,0 +1,17 @@
+# Reach Proxy
+
+Ce petit utilitaire permet de créer un proxy vers un module Reach, permettant ainsi à une instance [Fieldnotes](https://forge.cadoles.com/Pyxis/fieldnotes) de découvrir et travailler avec des modules qui seraient sur un autre réseau, par exemple:
+
+```
+Fieldnotes ----- [ Réseau WiFi local ] ------> PC avec proxy ----- [ VPN ]  ------> Module Reach
+```
+
+Le proxy s'annonce en mDNS permettant ainsi à l'application mobile de l'identifier automatiquement sur le réseau, comme si le proxy était un module Reach.
+
+## Usage
+
+```
+go run ./cmd/proxy -address <listening_address> -host <reachview_module_host>
+```
+
+Plus d'informations sont disponibles sur les différents flags via la commande `go run ./cmd/proxy -h`.

cmd/proxy/main.go

@@ -0,0 +1,188 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+	"os/signal"
+	"strconv"
+
+	"forge.cadoles.com/cadoles/go-emlid/reach/discovery"
+	"github.com/grandcat/zeroconf"
+	"github.com/pkg/errors"
+	sloghttp "github.com/samber/slog-http"
+	"github.com/wlynxg/anet"
+)
+
+var (
+	address = ":8080"
+	host    = "192.168.42.1"
+	name    = ""
+)
+
+func init() {
+	flag.StringVar(&address, "address", address, "proxy listening address")
+	flag.StringVar(&host, "host", host, "reachview host adress")
+	flag.StringVar(&name, "name", name, "reachview service name, default machine hostname")
+}
+
+func main() {
+	flag.Parse()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	server, err := startProxy(ctx, address, host)
+	if err != nil {
+		slog.Error("could not start proxy", slog.Any("error", errors.WithStack(err)))
+		os.Exit(1)
+	}
+
+	defer server.Close()
+
+	service, err := startMDNSService(ctx, address, name)
+	if err != nil {
+		slog.Error("could not start mdns service", slog.Any("error", errors.WithStack(err)))
+		os.Exit(1)
+	}
+
+	defer service.Shutdown()
+
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, os.Interrupt)
+
+	slog.Info("Ctrl+C to interrupt")
+
+	<-interrupt
+}
+
+func startProxy(ctx context.Context, address string, host string) (*http.Server, error) {
+	backendURL, err := url.Parse(fmt.Sprintf("http://%s", host))
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	proxy := httputil.NewSingleHostReverseProxy(backendURL)
+
+	handler := sloghttp.Recovery(proxy)
+	handler = sloghttp.New(slog.Default())(handler)
+
+	server := &http.Server{
+		Addr:    address,
+		Handler: handler,
+	}
+
+	go func() {
+		slog.Info("starting proxy server", slog.Any("address", server.Addr))
+
+		if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			slog.Error("could not listen and proxy http requests", slog.Any("error", errors.WithStack(err)))
+		}
+	}()
+
+	go func() {
+		<-ctx.Done()
+		if err := server.Close(); err != nil {
+			slog.Error("could not close proxy server", slog.Any("error", errors.WithStack(err)))
+		}
+	}()
+
+	return server, nil
+}
+
+func startMDNSService(ctx context.Context, address string, name string) (*zeroconf.Server, error) {
+	if name == "" {
+		hostname, err := os.Hostname()
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		name = hostname
+	}
+
+	ifaces, err := anet.Interfaces()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	ips, err := GetLANIPv4Addrs()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	info := []string{
+		fmt.Sprintf("local_name=%s", name),
+		"device=ReachProxy",
+		"manufacturer_data=egoHIABggkMnZWSuoy0KAgAA",
+	}
+
+	host, rawPort, err := net.SplitHostPort(address)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	var port int64
+	if rawPort != "" {
+		port, err = strconv.ParseInt(rawPort, 10, 32)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+	}
+
+	if host != "" {
+		ips = []string{host}
+	}
+
+	slog.Info("announcing mdns service", slog.Any("ips", ips), slog.Any("info", info))
+
+	server, err := zeroconf.RegisterProxy("Reach", discovery.ReachService, "local.", int(port), name, ips, info, ifaces)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	go func() {
+		<-ctx.Done()
+		server.Shutdown()
+	}()
+
+	return server, nil
+}
+
+var (
+	_, lanA, _ = net.ParseCIDR("10.0.0.0/8")
+	_, lanB, _ = net.ParseCIDR("172.16.0.0/12")
+	_, lanC, _ = net.ParseCIDR("192.168.0.0/16")
+)
+
+func GetLANIPv4Addrs() ([]string, error) {
+	ips := make([]string, 0)
+
+	addrs, err := anet.InterfaceAddrs()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	for _, address := range addrs {
+		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+			ipv4 := ipnet.IP.To4()
+			if ipv4 == nil {
+				continue
+			}
+
+			isLAN := lanA.Contains(ipv4) || lanB.Contains(ipv4) || lanC.Contains(ipv4)
+			if !isLAN {
+				continue
+			}
+
+			ips = append(ips, ipv4.String())
+		}
+	}
+
+	return ips, nil
+}

go.mod

@@ -1,23 +1,31 @@
 module forge.cadoles.com/cadoles/go-emlid
 
-go 1.22.5
+go 1.23
 
 require (
 	forge.cadoles.com/Pyxis/golang-socketio v0.0.0-20240805155359-f54949ba3a46
-	github.com/Masterminds/semver/v3 v3.2.1
+	github.com/Masterminds/semver/v3 v3.3.0
 	github.com/davecgh/go-spew v1.1.1
+	github.com/googollee/go-socket.io v1.7.0
+	github.com/gorilla/websocket v1.5.3
 	github.com/grandcat/zeroconf v1.0.0
+	github.com/miekg/dns v1.1.62
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/pkg/errors v0.9.1
+	github.com/samber/slog-http v1.4.2
+	github.com/wlynxg/anet v0.0.4
+	golang.org/x/net v0.29.0
 )
 
 require (
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
-	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/gofrs/uuid v4.4.0+incompatible // indirect
-	github.com/hashicorp/mdns v1.0.5 // indirect
+	github.com/gomodule/redigo v1.9.2 // indirect
-	github.com/miekg/dns v1.1.41 // indirect
+	github.com/google/uuid v1.6.0 // indirect
-	github.com/wlynxg/anet v0.0.4-0.20240806025826-e684438fc7c6 // indirect
+	go.opentelemetry.io/otel v1.30.0 // indirect
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect
+	go.opentelemetry.io/otel/trace v1.30.0 // indirect
-	golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1 // indirect
+	golang.org/x/mod v0.21.0 // indirect
-	golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/tools v0.25.0 // indirect
 )

go.sum

@@ -1,59 +1,76 @@
-forge.cadoles.com/Pyxis/golang-socketio v0.0.0-20180919100209-bb857ced6b95 h1:o3G5+9RjczCK1xAYFaRMknk1kY9Ule6PNfiW6N6hEpg=
-forge.cadoles.com/Pyxis/golang-socketio v0.0.0-20180919100209-bb857ced6b95/go.mod h1:I6kYOFWNkFlNeQLI7ZqfTRz4NdPHZxX0Bzizmzgchs0=
 forge.cadoles.com/Pyxis/golang-socketio v0.0.0-20240805155359-f54949ba3a46 h1:vLTYHA4+pYeI9mZvCMrc29AmnNjeGEpEG1mTwtCOoDI=
 forge.cadoles.com/Pyxis/golang-socketio v0.0.0-20240805155359-f54949ba3a46/go.mod h1:bT+HWia42VRX1TzTUlEM645tPJEOtsEdzlKBiEqVchY=
-github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
+github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
-github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
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+github.com/gofrs/uuid v4.0.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
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-github.com/hashicorp/mdns v1.0.5/go.mod h1:mtBihi+LeNXGtG8L9dX59gAEa12BDtBQSp4v/YAJqrc=
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 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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