Stream logs from syslog

internal/app/app.go

@@ -15,16 +15,18 @@ import (
 	"github.com/nemunaire/repeater/internal/hotspot"
 	"github.com/nemunaire/repeater/internal/logging"
 	"github.com/nemunaire/repeater/internal/models"
+	"github.com/nemunaire/repeater/internal/syslog"
 	"github.com/nemunaire/repeater/internal/wifi"
 )
 
 // App represents the application
 type App struct {
-	Status      models.SystemStatus
-	StatusMutex sync.RWMutex
-	StartTime   time.Time
-	Assets      embed.FS
-	Config      *config.Config
+	Status       models.SystemStatus
+	StatusMutex  sync.RWMutex
+	StartTime    time.Time
+	Assets       embed.FS
+	Config       *config.Config
+	SyslogTailer *syslog.SyslogTailer
 }
 
 // New creates a new application instance
@@ -60,6 +62,19 @@ func (a *App) Initialize(cfg *config.Config) error {
 		// Don't fail - polling fallback still works
 	}
 
+	// Start syslog tailing if enabled
+	if cfg.SyslogEnabled {
+		a.SyslogTailer = syslog.NewSyslogTailer(
+			cfg.SyslogPath,
+			cfg.SyslogFilter,
+			cfg.SyslogSource,
+		)
+		if err := a.SyslogTailer.Start(); err != nil {
+			log.Printf("Warning: Failed to start syslog tailing: %v", err)
+			// Don't fail - app continues without syslog
+		}
+	}
+
 	// Start periodic tasks
 	go a.periodicStatusUpdate()
 	go a.periodicDeviceUpdate()
@@ -78,6 +93,11 @@ func (a *App) Run(addr string) error {
 
 // Shutdown gracefully shuts down the application
 func (a *App) Shutdown() {
+	// Stop syslog tailing if running
+	if a.SyslogTailer != nil {
+		a.SyslogTailer.Stop()
+	}
+
 	wifi.StopEventMonitoring()
 	wifi.Close()
 	logging.AddLog("Système", "Application arrêtée")

internal/config/cli.go

@@ -11,6 +11,10 @@ func declareFlags(o *Config) {
 	flag.BoolVar(&o.UseARPDiscovery, "use-arp-discovery", true, "Use ARP table for device discovery instead of DHCP leases")
 	flag.StringVar(&o.DHCPLeasesPath, "dhcp-leases-path", "/var/lib/dhcp/dhcpd.leases", "Path to DHCP leases file")
 	flag.StringVar(&o.ARPTablePath, "arp-table-path", "/proc/net/arp", "Path to ARP table file")
+	flag.BoolVar(&o.SyslogEnabled, "syslog-enabled", false, "Enable syslog tailing for iwd messages")
+	flag.StringVar(&o.SyslogPath, "syslog-path", "/var/log/messages", "Path to syslog file")
+	flag.StringVar(&o.SyslogFilter, "syslog-filter", "daemon.info iwd:", "Filter string for syslog lines")
+	flag.StringVar(&o.SyslogSource, "syslog-source", "iwd", "Source name for syslog entries in logs")
 }
 
 // parseCLI parse the flags and treats extra args as configuration filename.

internal/config/config.go

@@ -14,6 +14,10 @@ type Config struct {
 	UseARPDiscovery      bool
 	DHCPLeasesPath       string
 	ARPTablePath         string
+	SyslogEnabled        bool
+	SyslogPath           string
+	SyslogFilter         string
+	SyslogSource         string
 }
 
 // ConsolidateConfig fills an Options struct by reading configuration from
@@ -28,6 +32,10 @@ func ConsolidateConfig() (opts *Config, err error) {
 		UseARPDiscovery: true,
 		DHCPLeasesPath:  "/var/lib/dhcp/dhcpd.leases",
 		ARPTablePath:    "/proc/net/arp",
+		SyslogEnabled:   false,
+		SyslogPath:      "/var/log/messages",
+		SyslogFilter:    "daemon.info iwd:",
+		SyslogSource:    "iwd",
 	}
 
 	declareFlags(opts)

internal/syslog/parser.go

@@ -0,0 +1,32 @@
+package syslog
+
+import (
+	"strings"
+)
+
+// ParseSyslogLine extracts the message content from a syslog line.
+// It looks for the daemon prefix in the line and returns the message after it.
+//
+// Example input: "Dec  2 02:01:33 tyet daemon.info iwd: Error loading /var/lib/iwd//nemuphone.psk"
+// Example output: "Error loading /var/lib/iwd//nemuphone.psk", true
+//
+// Returns the message and a boolean indicating if the line was successfully parsed.
+func ParseSyslogLine(line, daemonPrefix string) (string, bool) {
+	// Find the daemon prefix in the line (e.g., "iwd:")
+	idx := strings.Index(line, daemonPrefix)
+	if idx == -1 {
+		return "", false
+	}
+
+	// Extract everything after the daemon prefix
+	message := line[idx+len(daemonPrefix):]
+
+	// Trim leading/trailing whitespace
+	message = strings.TrimSpace(message)
+
+	if message == "" {
+		return "", false
+	}
+
+	return message, true
+}

internal/syslog/syslog.go

@@ -0,0 +1,218 @@
+package syslog
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/nemunaire/repeater/internal/logging"
+)
+
+// SyslogTailer tails a syslog file and filters messages to the logging system.
+type SyslogTailer struct {
+	path   string
+	filter string
+	source string
+
+	file    *os.File
+	done    chan struct{}
+	wg      sync.WaitGroup
+	mu      sync.Mutex
+	running bool
+}
+
+// NewSyslogTailer creates a new syslog tailer.
+// path: Path to the syslog file (e.g., "/var/log/messages")
+// filter: Filter string to match in lines (e.g., "daemon.info iwd:")
+// source: Source name for logging (e.g., "iwd")
+func NewSyslogTailer(path, filter, source string) *SyslogTailer {
+	return &SyslogTailer{
+		path:   path,
+		filter: filter,
+		source: source,
+		done:   make(chan struct{}),
+	}
+}
+
+// Start opens the syslog file and begins tailing it.
+func (t *SyslogTailer) Start() error {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	if t.running {
+		return nil
+	}
+
+	// Try to open the file
+	file, err := os.Open(t.path)
+	if err != nil {
+		// File might not exist yet, we'll retry in the goroutine
+		log.Printf("Warning: Cannot open syslog file %s: %v (will retry)", t.path, err)
+	} else {
+		// Seek to the end to only read new entries
+		_, err = file.Seek(0, io.SeekEnd)
+		if err != nil {
+			file.Close()
+			return err
+		}
+		t.file = file
+	}
+
+	t.running = true
+	t.wg.Add(1)
+	go t.tail()
+
+	return nil
+}
+
+// Stop signals the tailer to stop and waits for it to finish.
+func (t *SyslogTailer) Stop() {
+	t.mu.Lock()
+	if !t.running {
+		t.mu.Unlock()
+		return
+	}
+	t.mu.Unlock()
+
+	close(t.done)
+	t.wg.Wait()
+
+	t.mu.Lock()
+	if t.file != nil {
+		t.file.Close()
+		t.file = nil
+	}
+	t.running = false
+	t.mu.Unlock()
+}
+
+// tail is the main loop that reads from the syslog file.
+func (t *SyslogTailer) tail() {
+	defer t.wg.Done()
+
+	retryDelay := 1 * time.Second
+	maxRetryDelay := 30 * time.Second
+
+	for {
+		select {
+		case <-t.done:
+			return
+		default:
+		}
+
+		// Check if we have a file open
+		t.mu.Lock()
+		file := t.file
+		t.mu.Unlock()
+
+		if file == nil {
+			// Try to open the file
+			newFile, err := os.Open(t.path)
+			if err != nil {
+				// File doesn't exist or can't be opened, wait and retry
+				select {
+				case <-t.done:
+					return
+				case <-time.After(retryDelay):
+					// Exponential backoff
+					retryDelay *= 2
+					if retryDelay > maxRetryDelay {
+						retryDelay = maxRetryDelay
+					}
+					continue
+				}
+			}
+
+			// Seek to the end
+			_, err = newFile.Seek(0, io.SeekEnd)
+			if err != nil {
+				log.Printf("Error seeking syslog file: %v", err)
+				newFile.Close()
+				time.Sleep(retryDelay)
+				continue
+			}
+
+			t.mu.Lock()
+			t.file = newFile
+			file = newFile
+			t.mu.Unlock()
+
+			retryDelay = 1 * time.Second
+			log.Printf("Syslog tailer: opened %s", t.path)
+		}
+
+		// Read lines from the file
+		if err := t.readLines(file); err != nil {
+			if err == io.EOF {
+				// End of file, wait a bit and try again
+				time.Sleep(100 * time.Millisecond)
+				continue
+			}
+
+			// Other error, close the file and retry
+			log.Printf("Error reading syslog file: %v", err)
+			t.mu.Lock()
+			if t.file != nil {
+				t.file.Close()
+				t.file = nil
+			}
+			t.mu.Unlock()
+
+			time.Sleep(retryDelay)
+		}
+	}
+}
+
+// readLines reads and processes lines from the file.
+func (t *SyslogTailer) readLines(file *os.File) error {
+	scanner := bufio.NewScanner(file)
+
+	// Increase buffer size to handle long log lines
+	const maxCapacity = 512 * 1024
+	buf := make([]byte, maxCapacity)
+	scanner.Buffer(buf, maxCapacity)
+
+	for scanner.Scan() {
+		select {
+		case <-t.done:
+			return nil
+		default:
+		}
+
+		line := scanner.Text()
+
+		// Check if the line contains the filter string
+		if !strings.Contains(line, t.filter) {
+			continue
+		}
+
+		// Parse the syslog line to extract the message
+		// We look for "iwd:" (or whatever comes after the filter)
+		// The filter is "daemon.info iwd:" so we want to extract text after "iwd:"
+		daemonPrefix := extractDaemonPrefix(t.filter)
+		message, ok := ParseSyslogLine(line, daemonPrefix)
+		if !ok {
+			// Couldn't parse the line, skip it
+			continue
+		}
+
+		// Add to logging system
+		logging.AddLog(t.source, message)
+	}
+
+	return scanner.Err()
+}
+
+// extractDaemonPrefix extracts the daemon prefix from the filter string.
+// For example, "daemon.info iwd:" returns "iwd:"
+func extractDaemonPrefix(filter string) string {
+	parts := strings.Fields(filter)
+	if len(parts) > 0 {
+		return parts[len(parts)-1]
+	}
+	return filter
+}