"path/filepath"
"strings"
"sync"
+ "sync/atomic"
"time"
)
// 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
)
+// errCallLimit tells that a client sent its limit of calls.
+var errCallLimit = errors.New("call limit reached")
+
// authorizer adds the credentials of a model call to the headers of its
// request.
type authorizer interface {
// 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
cacheKey string
usage *usageLog
http *http.Client
+ limit int64
+ calls atomic.Int64
}
// Request is one model call. Input holds the input items in order, such as
-// userMessage values or output items of an earlier response.
+// userMessage values or output items of an earlier response. Node names the
+// node that a compaction builds, or is nil. It goes only to the usage file,
+// never to the endpoint.
type Request struct {
Model string
Effort string
Instructions string
Tools []Tool
Input []any
+ Node *nodeKey
}
// Tool is the definition of a function tool.
}
}
-// Create sends the call and reads its event stream to the end.
+// LimitCalls makes the client refuse each call after the first limit calls.
+func (c *Client) LimitCalls(limit int64) {
+ c.limit = limit
+}
+
+// LimitReached tells if the client refuses further calls.
+func (c *Client) LimitReached() bool {
+ return c.limit > 0 && c.calls.Load() >= c.limit
+}
+
+// Create sends the call and reads its event stream to the end. Over the call
+// limit it sends nothing and returns errCallLimit.
func (c *Client) Create(ctx context.Context, request Request) (Response, error) {
+ if c.calls.Add(1) > c.limit && c.limit > 0 {
+ return Response{}, errCallLimit
+ }
+
body, err := json.Marshal(requestBody{
Model: request.Model,
Instructions: request.Instructions,
return Response{}, fmt.Errorf("authorize model call: %w", err)
}
+ _, chatgpt := c.auth.(*chatgptAuth)
+ if chatgpt {
+ httpRequest.Header.Set("session_id", c.cacheKey)
+ }
+
+ start := time.Now()
record := usageRecord{
- Date: time.Now().Format(time.RFC3339Nano),
+ Date: start.Format(time.RFC3339Nano),
Model: request.Model,
}
+ if request.Node != nil {
+ record.Node = &[2]int{request.Node.level, request.Node.index}
+ }
+
response, err := c.send(httpRequest, &record)
if err != nil {
record.Error = err.Error()
}
+ record.Seconds = time.Since(start).Seconds()
record.InputTokens = response.Usage.Input
record.CachedTokens = response.Usage.Cached
record.OutputTokens = response.Usage.Output
+ record.TextBytes = len(response.Text)
return response, errors.Join(err, c.usage.Write(record))
}
path string
}
-// 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.
+// usageRecord is one line of usage.jsonl. Date is the start of the call, and
+// Seconds its length. Node is the node [l, i] of a compaction. Status is the
+// HTTP status, or 0 when no response came. TextBytes is the size of the text of
+// the reply. Quota holds the x-codex-* headers of the response, without the
+// turn state.
type usageRecord struct {
Date string `json:"date"`
+ Seconds float64 `json:"seconds"`
Model string `json:"model"`
+ Node *[2]int `json:"node,omitempty"`
Status int `json:"status"`
InputTokens int `json:"input_tokens"`
CachedTokens int `json:"cached_tokens"`
OutputTokens int `json:"output_tokens"`
+ TextBytes int `json:"text_bytes"`
Quota map[string]string `json:"quota,omitempty"`
Error string `json:"error,omitempty"`
}
}
}
-// 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
}
projects / onechat / blobdiff