fix(bridge): stop replaying explicit terminal provider failures

apps/desktop/assets/codex-bridge/terminal_stream.py

@@ -0,0 +1,119 @@
+"""Transport-only handling of a worker's explicit terminal failure.
+
+Never selects a model, evaluates content, or changes worker/Jev decisions.
+If HTTP headers have already gone out, remember the failure for exactly one
+identical retry. Codex then receives an HTTP error instead of re-running the
+whole exhausted provider chain. Ordinary network interruptions remain retries.
+"""
+import hashlib
+import json
+import threading
+import time
+from collections import OrderedDict
+
+
+def request_key(request, headers):
+    principal = "\0".join(headers.get(name, "") for name in
+                          ("Authorization", "ChatGPT-Account-Id", "session_id"))
+    body = json.dumps(request, sort_keys=True, ensure_ascii=False, separators=(",", ":"))
+    return hashlib.sha256((principal + "\0" + body).encode()).digest()
+
+
+class FailureReplays:
+    def __init__(self, ttl=120, capacity=128, clock=time.monotonic):
+        self.ttl, self.capacity, self.clock = ttl, capacity, clock
+        self.items = OrderedDict()
+        self.lock = threading.Lock()
+
+    def remember(self, key, error):
+        with self.lock:
+            self.items[key] = (self.clock() + self.ttl, error)
+            self.items.move_to_end(key)
+            while len(self.items) > self.capacity:
+                self.items.popitem(last=False)
+
+    def take(self, key):
+        with self.lock:
+            entry = self.items.pop(key, None)
+        return entry[1] if entry and entry[0] > self.clock() else None
+
+
+def error_body(error):
+    # Preserve the actual provider failure; don't relabel it invalid_prompt,
+    # fabricate response.completed, or expose a rejected model response.
+    return {"error": {"type": "upstream_terminal_error", "code": error["code"],
+                      "message": "Model yanıtı hata ile sonlandı. " + error["message"]}}
+
+
+class Observer:
+    """Bounded SSE observer. Forwarded stream bytes are never rewritten."""
+    LIMIT = 65536
+
+    def __init__(self):
+        self.tail = b""
+        self.data = []
+        self.size = 0
+        self.discard = False
+        self.discard_line = False
+        self.comment_seen = False
+        self.payload_seen = False
+        self.completed = False
+        self.error = None
+
+    def feed(self, chunk):
+        # read1() supplies small chunks, but also bound arbitrary caller input.
+        for offset in range(0, len(chunk), 4096):
+            self.tail += chunk[offset:offset + 4096]
+            while b"\n" in self.tail:
+                line, self.tail = self.tail.split(b"\n", 1)
+                if self.discard_line:
+                    self.discard_line = False
+                    continue
+                self._line(line.rstrip(b"\r"))
+            if len(self.tail) > self.LIMIT:
+                self.tail = b""
+                self.discard = self.discard_line = True
+
+    def _line(self, line):
+        if line.startswith(b":"):
+            self.comment_seen = True
+        elif line.startswith(b"data:"):
+            self.size += len(line)
+            if self.size > self.LIMIT:
+                self.discard = True
+                self.data.clear()
+            elif not self.discard:
+                self.data.append(line[5:].lstrip())
+        elif not line:
+            if self.data and not self.discard:
+                self._event(b"\n".join(self.data))
+            elif self.discard:
+                self.payload_seen = True
+            self.data, self.size, self.discard = [], 0, False
+
+    def _event(self, data):
+        try:
+            event = json.loads(data)
+        except (ValueError, UnicodeError):
+            self.payload_seen = True
+            return
+        if not isinstance(event, dict):
+            self.payload_seen = True
+            return
+        kind = event.get("type")
+        response = event.get("response")
+        error = event.get("error") if kind == "error" else response.get("error") if isinstance(response, dict) else None
+        # Known worker terminal errors only. Preserve context/rate-limit and
+        # other native error classifications rather than guessing semantics.
+        is_failure = (kind == "error" and isinstance(error, dict)
+                      and error.get("type") == "upstream_error")
+        is_failure |= (kind == "response.failed" and isinstance(error, dict)
+                       and error.get("code") == "jev_no_fallback")
+        if is_failure:
+            self.error = {"code": str(error.get("code") or "upstream_error")[:100],
+                          "message": str(error.get("message") or "Sağlayıcı yanıtı tamamlanamadı.")[:2000]}
+        else:
+            self.payload_seen = True
+        if kind == "response.completed":
+            self.completed = True
+            self.error = None