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server: add exceed_context_size_error type (#15780)

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* server: add exceed_context_size_error type

* change error code to 400
This commit is contained in:
Xuan-Son Nguyen
2025-09-04 11:50:23 +02:00
committed by GitHub
parent badb80cadb
commit a68d914426
2 changed files with 45 additions and 8 deletions
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30
tools/server/server.cpp
View File

@@ -86,6 +86,7 @@ enum error_type {
ERROR_TYPE_PERMISSION,
ERROR_TYPE_UNAVAILABLE, // custom error
ERROR_TYPE_NOT_SUPPORTED, // custom error
ERROR_TYPE_EXCEED_CONTEXT_SIZE, // custom error
};
static bool server_task_type_need_embd(server_task_type task_type) {
@@ -1224,6 +1225,10 @@ static json format_error_response(const std::string & message, const enum error_
type_str = "unavailable_error";
code = 503;
break;
case ERROR_TYPE_EXCEED_CONTEXT_SIZE:
type_str = "exceed_context_size_error";
code = 400;
break;
}
return json {
{"code", code},
@@ -1237,12 +1242,21 @@ struct server_task_result_error : server_task_result {
error_type err_type = ERROR_TYPE_SERVER;
std::string err_msg;
// for ERROR_TYPE_EXCEED_CONTEXT_SIZE
int32_t n_prompt_tokens = 0;
int32_t n_ctx = 0;
virtual bool is_error() override {
return true;
}
virtual json to_json() override {
return format_error_response(err_msg, err_type);
json res = format_error_response(err_msg, err_type);
if (err_type == ERROR_TYPE_EXCEED_CONTEXT_SIZE) {
res["n_prompt_tokens"] = n_prompt_tokens;
res["n_ctx"] = n_ctx;
}
return res;
}
};
@@ -2605,16 +2619,22 @@ struct server_context {
}
void send_error(const server_slot & slot, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
send_error(slot.id_task, error, type);
send_error(slot.id_task, error, type, slot.n_prompt_tokens, slot.n_ctx);
}
void send_error(const int id_task, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
void send_error(const int id_task, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER, const int32_t n_prompt_tokens = 0, const int32_t n_ctx = 0) {
SRV_ERR("task id = %d, error: %s\n", id_task, error.c_str());
if (type == ERROR_TYPE_EXCEED_CONTEXT_SIZE) {
GGML_ASSERT(n_ctx > 0 && n_prompt_tokens > 0);
}
auto res = std::make_unique<server_task_result_error>();
res->id = id_task;
res->err_type = type;
res->err_msg = error;
res->n_prompt_tokens = n_prompt_tokens;
res->n_ctx = n_ctx;
queue_results.send(std::move(res));
}
@@ -3286,7 +3306,7 @@ struct server_context {
if (slot.n_prompt_tokens > slot.n_ctx) {
slot.release();
send_error(slot, "input is larger than the max context size. skipping", ERROR_TYPE_SERVER);
send_error(slot, "input is larger than the max context size. skipping", ERROR_TYPE_EXCEED_CONTEXT_SIZE);
continue;
}
} else {
@@ -3296,7 +3316,7 @@ struct server_context {
// context shift should be applied only during the generation phase
if (slot.n_prompt_tokens >= slot.n_ctx) {
slot.release();
send_error(slot, "the request exceeds the available context size. try increasing the context size or enable context shift", ERROR_TYPE_INVALID_REQUEST);
send_error(slot, "the request exceeds the available context size. try increasing the context size or enable context shift", ERROR_TYPE_EXCEED_CONTEXT_SIZE);
continue;
}
}

17
tools/server/tests/unit/test_chat_completion.py
View File

@@ -385,3 +385,20 @@ def test_logit_bias():
output_text = res.choices[0].message.content
assert output_text
assert all(output_text.find(" " + tok + " ") == -1 for tok in exclude)
def test_context_size_exceeded():
global server
server.start()
res = server.make_request("POST", "/chat/completions", data={
"messages": [
{"role": "system", "content": "Book"},
{"role": "user", "content": "What is the best book"},
] * 100, # make the prompt too long
})
assert res.status_code == 400
assert "error" in res.body
assert res.body["error"]["type"] == "exceed_context_size_error"
assert res.body["error"]["n_prompt_tokens"] > 0
assert server.n_ctx is not None
assert server.n_slots is not None
assert res.body["error"]["n_ctx"] == server.n_ctx // server.n_slots