Add fsnotify handling

Containerfile

@@ -0,0 +1,15 @@
+FROM golang:alpine as builder
+
+ENV CGO_ENABLED 0
+
+RUN go env -w GOCACHE=/go-cache
+RUN go env -w GOMODCACHE=/gomod-cache
+COPY . /build
+WORKDIR /build
+RUN --mount=type=cache,target=/gomod-cache --mount=type=cache,target=/go-cache go build -o test ./cmd
+
+FROM scratch
+
+COPY --from=builder /build/test /
+ENTRYPOINT ["./test"]
+

cmd/root.go

@@ -4,6 +4,7 @@ import (
 	"log/slog"
 	"math/rand/v2"
 	"os"
+	"path"
 	"time"
 
 	"github.com/fsnotify/fsnotify"
@@ -37,7 +38,7 @@ func (db InputDb) Lookup(key int) string {
 func main() {
 	var db InputDb
 	done := make(chan struct{}, 1)
-	ticker := time.NewTicker(3 * time.Millisecond)
+	ticker := time.NewTicker(100 * time.Millisecond)
 
 	watcher, err := fsnotify.NewWatcher()
 	if err != nil {
@@ -47,9 +48,9 @@ func main() {
 	newInputDbFromFile("input/input.yml", &db)
 	slog.Info("Loaded DB", "db", db)
 
-	err = watcher.Add("input/input.yml")
+	err = watcher.Add("input/")
 	if err != nil {
-		slog.Error("Could not watch path", "path", "input/input.yml")
+		slog.Error("Could not watch path", "path", "input/")
 	}
 
 	go func() {
@@ -59,12 +60,13 @@ func main() {
 				key := rand.IntN(9) + 1
 				value := db.Lookup(key)
 				slog.Info("Got Rand", "key", key, "value", value, "ticker", t)
-			case event, ok := <-watcher.Events:
+			case event := <-watcher.Events:
-				if !ok {
+				if event.Has(fsnotify.Write) && event.Name == "input/input.yml" {
-					slog.Error("Could not log Event", "event.name", event.Name, "event.op", event.Op)
+					slog.Info("Got Event", "event.name", event.Name, "event.name.base", path.Base(event.Name), "event.name.dir", path.Dir(event.Name), "event.op", event.Op, "watchlist", watcher.WatchList())
+					newInputDbFromFile("input/input.yml", &db)
 				}
-				slog.Info("Got Event", "event.name", event.Name, "event.op", event.Op)
+			case err := <-watcher.Errors:
-				newInputDbFromFile("input/input.yml", &db)
+				slog.Error("Could not watch", "error", err)
 			}
 		}
 	}()

go.mod

@@ -7,4 +7,4 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
-require golang.org/x/sys v0.4.0 // indirect
+require golang.org/x/sys v0.22.0 // indirect

go.sum

@@ -2,6 +2,8 @@ github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nos
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
 golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
+golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

input/input.yml

@@ -5,3 +5,6 @@
 4: D
 5: E
 6: F
+7: G
+8: H
+9: I