X-Git-Url: https://git.giacomolli.uk/onechat/blobdiff_plain/ddd0a50f7b801112376d7fb27bfd05d2fc26c2fd..6004a6d0f7af1ecf3d0ac976f50bb4f93c619887:/subagent.go?ds=sidebyside

diff --git a/subagent.go b/subagent.go
index 596c038..07bfa45 100644
--- a/subagent.go
+++ b/subagent.go
@@ -124,14 +124,40 @@ func (s *Subagents) Get(ctx context.Context, name string) (*Subagent, error) {
 	return subagent, nil
 }
 
+// Snapshot flushes and locks the open logs while snapshot reads the subagent
+// files. snapshot must not call Subagents or an open Subagent.
+func (s *Subagents) Snapshot(ctx context.Context, snapshot func() error) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	for _, subagent := range s.open {
+		subagent.mutex.Lock()
+		defer subagent.mutex.Unlock()
+
+		err := subagent.Flush(ctx)
+		if err != nil {
+			return fmt.Errorf("flush subagent snapshot: %w", err)
+		}
+	}
+
+	err := snapshot()
+	if err != nil {
+		return fmt.Errorf("copy subagent snapshot: %w", err)
+	}
+
+	return nil
+}
+
 // Close makes the writes of each open log durable and closes it.
 func (s *Subagents) Close() error {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
 
 	var err error
+
 	for name, subagent := range s.open {
 		err = errors.Join(err, subagent.close())
+
 		delete(s.open, name)
 	}
 
@@ -169,6 +195,14 @@ func (a *Subagent) Flush(ctx context.Context) error {
 	return a.syncer.Flush(ctx)
 }
 
+// First returns the first message of the log.
+func (a *Subagent) First() (Message, error) {
+	a.mutex.Lock()
+	defer a.mutex.Unlock()
+
+	return a.log.Message(0)
+}
+
 // Show returns the whole log, each message as "i|kind: text", with a blank line
 // between messages.
 func (a *Subagent) Show() (string, error) {