Assemble Remote speech before reader delivery

internal/tentaclewire/remote_speech.go

@@ -12,6 +12,7 @@ import (
 // Leave room for lease metadata inside the existing 8192-byte call bound.
 const MaxRemoteSpeechBytes = 6144
 const RemoteSpeechQueueSize = 64
+const RemoteSpeechQueueBytes = 256 * 1024
 
 // RemoteSpeechPart carries resolved character/language state for each fragment.
 // End is an utterance boundary, not text. Whitespace is significant.
@@ -31,7 +32,28 @@ type RemoteSpeech struct {
 
 type RemotePresentation struct {
 	RemoteOperation
-	Speech RemoteSpeech `json:"speech"`
+	Speech    RemoteSpeech `json:"speech"`
+	Utterance uint64       `json:"utterance,omitempty"` // First fragment's operation sequence.
+	Final     bool         `json:"final,omitempty"`
+}
+
+// A zero utterance is a complete, single-call effect. A nonzero utterance
+// stages speak fragments until Final; the reader admits them as one delivery.
+func ValidRemotePresentation(request RemotePresentation) bool {
+	return len(request.Lease) == 32 && request.Epoch != 0 && request.Sequence != 0 &&
+		ValidRemoteSpeech(request.Speech) &&
+		(request.Utterance == 0 && !request.Final ||
+			request.Utterance > 0 && request.Utterance <= request.Sequence && request.Speech.Kind == "speak")
+}
+
+func (request *RemotePresentation) UnmarshalJSON(data []byte) error {
+	type plain RemotePresentation
+	var value plain
+	if reject_speech_nulls(data) != nil || DecodeStrict(data, &value) != nil || !ValidRemotePresentation(RemotePresentation(value)) {
+		return ErrProtocol
+	}
+	*request = RemotePresentation(value)
+	return nil
 }
 
 func reject_speech_nulls(data []byte) error {