worker/lib: implement an fswatcher interface

Implement an FSWatcher interface. The interface is used to abstract away
file system watchers, which have implementation specific backends. The
initial interface has one implementation: inotify for linux. Subsequent
commits will add a macOS watcher.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Tested-by: Ben Lee-Cohen <ben@lee-cohen.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 24 insertions, 0 deletions

diff --git a/worker/types/watcher.go b/worker/types/watcher.go
new file mode 100644
index 00000000..b06d12d3
--- /dev/null
+++ b/worker/types/watcher.go
@@ -0,0 +1,24 @@
+package types
+
+// FSWatcher is a file system watcher
+type FSWatcher interface {
+	Configure(string) error
+	Events() chan *FSEvent
+	// Adds a directory or file to the watcher
+	Add(string) error
+	// Removes a directory or file from the watcher
+	Remove(string) error
+}
+
+type FSOperation int
+
+const (
+	FSCreate FSOperation = iota
+	FSRemove
+	FSRename
+)
+
+type FSEvent struct {
+	Operation FSOperation
+	Path      string
+}