[stop_seq] fix out-bound value for stop sequence (#3216)

* fix out-bound value for stop sequence

* catch error if there are out-of-bounds value

* check in offline mode

* add ut tests

fastdeploy/engine/engine.py

@@ -530,6 +530,26 @@ class LLMEngine:
             llm_logger.error(error_msg)
             raise EngineError(error_msg, error_code=400)
 
+        if request.get("stop_seqs_len") is not None:
+            stop_seqs_len = request.get("stop_seqs_len")
+            max_stop_seqs_num = int(envs.FD_MAX_STOP_SEQS_NUM)
+            if len(stop_seqs_len) > max_stop_seqs_num:
+                error_msg = (
+                    f"Length of stop ({stop_seqs_len}) exceeds the limit max_stop_seqs_num({max_stop_seqs_num})."
+                    "Please reduce the number of stop or set a lager max_stop_seqs_num by `FD_MAX_STOP_SEQS_NUM`"
+                )
+                llm_logger.error(error_msg)
+                raise EngineError(error_msg, error_code=400)
+            stop_seqs_max_len = int(envs.FD_STOP_SEQS_MAX_LEN)
+            for single_stop_seq_len in stop_seqs_len:
+                if single_stop_seq_len > stop_seqs_max_len:
+                    error_msg = (
+                        f"Length of stop_seqs({single_stop_seq_len}) exceeds the limit stop_seqs_max_len({stop_seqs_max_len})."
+                        "Please reduce the length of stop sequences or set a larger stop_seqs_max_len by `FD_STOP_SEQS_MAX_LEN`"
+                    )
+                    llm_logger.error(error_msg)
+                    raise EngineError(error_msg, error_code=400)
+
         if self.guided_decoding_checker is not None:
             request, err_msg = self.guided_decoding_checker.schema_format(request)
             if err_msg is not None:

fastdeploy/entrypoints/engine_client.py

@@ -19,6 +19,7 @@ import uuid
 
 import numpy as np
 
+from fastdeploy import envs
 from fastdeploy.engine.config import ModelConfig
 from fastdeploy.input.preprocess import InputPreprocessor
 from fastdeploy.inter_communicator import IPCSignal, ZmqClient
@@ -154,6 +155,26 @@ class EngineClient:
             api_server_logger.error(error_msg)
             raise EngineError(error_msg, error_code=400)
 
+        if "stop_seqs_len" in task:
+            stop_seqs_len = task["stop_seqs_len"]
+            max_stop_seqs_num = int(envs.FD_MAX_STOP_SEQS_NUM)
+            if len(stop_seqs_len) > max_stop_seqs_num:
+                error_msg = (
+                    f"Length of stop ({stop_seqs_len}) exceeds the limit max_stop_seqs_num({max_stop_seqs_num})."
+                    "Please reduce the number of stop or set a lager max_stop_seqs_num by `FD_MAX_STOP_SEQS_NUM`"
+                )
+                api_server_logger.error(error_msg)
+                raise EngineError(error_msg, error_code=400)
+            stop_seqs_max_len = int(envs.FD_STOP_SEQS_MAX_LEN)
+            for single_stop_seq_len in stop_seqs_len:
+                if single_stop_seq_len > stop_seqs_max_len:
+                    error_msg = (
+                        f"Length of stop_seqs({single_stop_seq_len}) exceeds the limit stop_seqs_max_len({stop_seqs_max_len})."
+                        "Please reduce the length of stop sequences or set a larger stop_seqs_max_len by `FD_STOP_SEQS_MAX_LEN`"
+                    )
+                    api_server_logger.error(error_msg)
+                    raise EngineError(error_msg, error_code=400)
+
         task["preprocess_end_time"] = time.time()
         preprocess_cost_time = task["preprocess_end_time"] - task["preprocess_start_time"]
         api_server_logger.info(

test/ce/server/test_evil_cases.py

@@ -95,3 +95,30 @@ def test_mixed_valid_invalid_fields():
     resp = send_request(URL, payload).json()
     assert "error" not in resp, "非法字段不应导致请求失败"
 
+
+def test_stop_seq_exceed_num():
+    """stop 字段包含超过 FD_MAX_STOP_SEQS_NUM 个元素，服务应报错"""
+    data = {
+        "stream": False,
+        "messages": [{"role": "user", "content": "非洲的首都是？"}],
+        "top_p": 0,
+        "stop": ["11", "22", "33", "44", "55", "66", "77"],
+    }
+    payload = build_request_payload(TEMPLATE, data)
+    resp = send_request(URL, payload).json()
+    assert resp.get("object") == "error", "stop 超出个数应触发异常"
+    assert "exceeds the limit max_stop_seqs_num" in resp.get("message", ""), "未返回预期的报错信息"
+
+
+def test_stop_seq_exceed_length():
+    """stop 中包含长度超过 FD_STOP_SEQS_MAX_LEN 的元素，服务应报错"""
+    data = {
+        "stream": False,
+        "messages": [{"role": "user", "content": "非洲的首都是？"}],
+        "top_p": 0,
+        "stop": ["11", "今天天气比明天好多了，请问你会出门还是和我一起玩"],
+    }
+    payload = build_request_payload(TEMPLATE, data)
+    resp = send_request(URL, payload).json()
+    assert resp.get("object") == "error", "stop 超出长度应触发异常"
+    assert "exceeds the limit stop_seqs_max_len" in resp.get("message", ""), "未返回预期的报错信息"