start big refactoring

internal/config/config.go

@@ -0,0 +1,14 @@
+package config
+
+import "fmt"
+
+type Config struct {
+	RDirs []string
+	Dirs  []string
+	LogFS bool
+	LogPS bool
+}
+
+func (c Config) String() string {
+	return fmt.Sprintf("Printing events: processes: %t | file system events: %t | Watching directories: %+v (recursive) | %+v (non-recursive)", c.LogPS, c.LogFS, c.RDirs, c.Dirs)
+}

internal/logger/logger.go

@@ -0,0 +1,37 @@
+package logger
+
+import (
+	"log"
+	"os"
+)
+
+// Logger is the logger used to print to the command line
+type Logger struct {
+	infoLogger  *log.Logger
+	errorLogger *log.Logger
+	eventLogger *log.Logger
+}
+
+// NewLogger creates a new logger instance
+func NewLogger() *Logger {
+	return &Logger{
+		infoLogger:  log.New(os.Stdout, "", 0),
+		errorLogger: log.New(os.Stderr, "", 0),
+		eventLogger: log.New(os.Stdout, "", log.Ldate|log.Ltime),
+	}
+}
+
+// Infof writes an info message to stdout
+func (l *Logger) Infof(format string, v ...interface{}) {
+	l.infoLogger.Printf(format, v...)
+}
+
+// Errorf writes an error message to stderr
+func (l *Logger) Errorf(format string, v ...interface{}) {
+	l.errorLogger.Printf(format, v...)
+}
+
+// Eventf writes an event with timestamp to stdout
+func (l *Logger) Eventf(format string, v ...interface{}) {
+	l.eventLogger.Printf(format, v...)
+}

internal/logger/logger_test.go

@@ -0,0 +1,41 @@
+package logger
+
+import (
+	"bytes"
+	"log"
+	"regexp"
+	"testing"
+)
+
+const dateFormatPattern = `[\d]{4}/[\d]{2}/[\d]{2} [\d]{2}:[\d]{2}:[\d]{2}`
+
+var l = NewLogger()
+
+var logTests = []struct {
+	logger      *log.Logger
+	test        func()
+	expectation string
+}{
+	{l.infoLogger, func() { l.Infof("Info message no. %d", 1) }, "Info message no. 1\n"},
+	{l.infoLogger, func() { l.Infof("Info message no. %d with a string %s\n", 2, "appended to it") }, "Info message no. 2 with a string appended to it\n"},
+	{l.errorLogger, func() { l.Errorf("Error message") }, "Error message\n"},
+	{l.errorLogger, func() { l.Errorf("Error message\n") }, "Error message\n"},
+	{l.eventLogger, func() { l.Eventf("Event message") }, dateFormatPattern + " Event message\n"},
+}
+
+func TestLogging(t *testing.T) {
+	for i, tt := range logTests {
+		actual := captureOutput(tt.logger, tt.test)
+		matcher := regexp.MustCompile(tt.expectation)
+		if !matcher.Match([]byte(actual)) {
+			t.Fatalf("[%d] Wrong message logged!: %s", i, actual)
+		}
+	}
+}
+
+func captureOutput(logger *log.Logger, f func()) string {
+	var buf bytes.Buffer
+	logger.SetOutput(&buf)
+	f()
+	return buf.String()
+}

internal/pspy/pspy.go

@@ -4,19 +4,62 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
+	"github.com/dominicbreuker/pspy/internal/config"
 	"github.com/dominicbreuker/pspy/internal/inotify"
+	"github.com/dominicbreuker/pspy/internal/logger"
 	"github.com/dominicbreuker/pspy/internal/process"
 	"github.com/dominicbreuker/pspy/internal/walker"
 )
 
-const MaxInt = int(^uint(0) >> 1)
+func Start(cfg config.Config, logger *logger.Logger) {
+	fmt.Printf("Config: %+v\n", cfg)
 
-func Monitor() {
-	Watch([]string{"/tmp"}, nil, true, true)
+	triggerCh, fsEventCh, err := setupInotify(cfg.RDirs, cfg.Dirs)
+	if err != nil {
+		logger.Errorf("Can't set up inotify watchers: %v\n", err)
+	}
+	psEventCh, err := setupProcfsScanner(triggerCh, 100*time.Millisecond)
+	if err != nil {
+		logger.Errorf("Can't set up procfs scanner: %+v\n", err)
+	}
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
+
+	for {
+		select {
+		case se := <-sigCh:
+			logger.Infof("Exiting program... (%s)\n", se)
+			os.Exit(0)
+		case fe := <-fsEventCh:
+			if cfg.LogFS {
+				logger.Eventf("FS: %+v\n", fe)
+			}
+		case pe := <-psEventCh:
+			if cfg.LogPS {
+				logger.Eventf("CMD: %+v\n", pe)
+			}
+		}
+	}
 }
 
+func setupInotify(rdirs, dirs []string) (chan struct{}, chan string, error) {
+	triggerCh := make(chan struct{})
+	fsEventCh := make(chan string)
+	return triggerCh, fsEventCh, nil
+}
+
+func setupProcfsScanner(triggerCh chan struct{}, interval time.Duration) (chan string, error) {
+	psEventCh := make(chan string)
+	return psEventCh, nil
+}
+
+const MaxInt = int(^uint(0) >> 1)
+
 func Watch(rdirs, dirs []string, logPS, logFS bool) {
 	maxWatchers, err := inotify.WatcherLimit()
 	if err != nil {