X-Git-Url: https://git.giacomolli.uk/onechat/blobdiff_plain/74583992d2939791ef74155c99eb194269ac3721..ba9faee0cd6c35020997794ef7bf134e8db12e96:/responses.go?ds=sidebyside

diff --git a/responses.go b/responses.go
index ebffaa3..096439f 100644
--- a/responses.go
+++ b/responses.go
@@ -27,6 +27,10 @@ const (
 	// backend, in canonical form.
 	quotaPrefix = "X-Codex-"
 
+	// turnStateHeader is an x-codex-* header that holds an opaque state of
+	// the backend, not quota.
+	turnStateHeader = "X-Codex-Turn-State"
+
 	// errorBytes is the most bytes of an error response that go into the
 	// error.
 	errorBytes = 4096
@@ -44,8 +48,10 @@ type apiKey string
 // Client sends model calls to a Responses endpoint for one agent. The ChatGPT
 // backend and the OpenAI API take the same request body and differ only in the
 // URL and the credentials. Every call sends the fixed cache key of the agent,
-// so the turns and the compactions of the agent share one prompt cache. Every
-// call is recorded in the usage file.
+// so the turns and the compactions of the agent share one prompt cache. The
+// ChatGPT backend caches only with the key in the session_id header, so a call
+// to it sends the key there and in the body. Every call is recorded in the
+// usage file.
 //
 // The request never holds max_output_tokens or metadata, because the ChatGPT
 // backend refuses them. It sets store to false, so the client sends the whole
@@ -213,6 +219,11 @@ func (c *Client) Create(ctx context.Context, request Request) (Response, error)
 		return Response{}, fmt.Errorf("authorize model call: %w", err)
 	}
 
+	_, chatgpt := c.auth.(*chatgptAuth)
+	if chatgpt {
+		httpRequest.Header.Set("session_id", c.cacheKey)
+	}
+
 	record := usageRecord{
 		Date:  time.Now().Format(time.RFC3339Nano),
 		Model: request.Model,
@@ -262,7 +273,8 @@ type usageLog struct {
 }
 
 // usageRecord is one line of usage.jsonl. Status is the HTTP status, or 0 when
-// no response came. Quota holds the x-codex-* headers of the response.
+// no response came. Quota holds the x-codex-* headers of the response, without
+// the turn state.
 type usageRecord struct {
 	Date         string            `json:"date"`
 	Model        string            `json:"model"`
@@ -331,11 +343,12 @@ func userMessage(texts ...string) any {
 	}
 }
 
-// quotaHeaders returns the x-codex-* headers, with lowercase names.
+// quotaHeaders returns the x-codex-* headers, with lowercase names, without the
+// turn state.
 func quotaHeaders(header http.Header) map[string]string {
 	var quota map[string]string
 	for name, values := range header {
-		if !strings.HasPrefix(name, quotaPrefix) || len(values) == 0 {
+		if !strings.HasPrefix(name, quotaPrefix) || name == turnStateHeader || len(values) == 0 {
 			continue
 		}