Deliver messages between parent and child agents

[onechat] / subagent.go

diff --git a/subagent.go b/subagent.go
index 596c03818510460456b8cbead078bf0051aeee3f..07bfa452f6c8aef7bc18bf10c6bbc097668f5793 100644 (file)
--- 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) {