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Server: format error to json (#5961)

Browse Source 
* server: format error to json

* server: do not crash on grammar error

* fix api key test case

* revert limit max n_predict

* small fix

* correct coding style

* update completion.js

* launch_slot_with_task

* update docs

* update_slots

* update webui

* update readme
This commit is contained in:
Xuan Son Nguyen
2024-03-11 10:56:41 +01:00
committed by GitHub
parent 3202361c5b
commit caa106d4e0
6 changed files with 430 additions and 317 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
examples/server/README.md
View File

@@ -556,9 +556,51 @@ Run with bash:
bash chat.sh
```
### API like OAI
### OAI-like API
The HTTP server supports OAI-like API
The HTTP server supports OAI-like API: https://github.com/openai/openai-openapi
### API errors
Server returns error in the same format as OAI: https://github.com/openai/openai-openapi
Example of an error:
```json
{
"error": {
"code": 401,
"message": "Invalid API Key",
"type": "authentication_error"
}
}
```
Apart from error types supported by OAI, we also have custom types that are specific to functionalities of llama.cpp:
**When /metrics or /slots endpoint is disabled**
```json
{
"error": {
"code": 501,
"message": "This server does not support metrics endpoint.",
"type": "not_supported_error"
}
}
```
**When the server receives invalid grammar via */completions endpoint**
```json
{
"error": {
"code": 400,
"message": "Failed to parse grammar",
"type": "invalid_request_error"
}
}
```
### Extending or building alternative Web Front End

469
examples/server/completion.js.hpp
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@@ -231,255 +231,256 @@ unsigned char completion_js[] = {
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};
unsigned int completion_js_len = 5782;
unsigned int completion_js_len = 5796;

20
examples/server/public/completion.js
View File

@@ -96,18 +96,18 @@ export async function* llama(prompt, params = {}, config = {}) {
}
}
if (result.error) {
result.error = JSON.parse(result.error);
if (result.error.content.includes('slot unavailable')) {
// Throw an error to be caught by upstream callers
throw new Error('slot unavailable');
} else {
console.error(`llama.cpp error: ${result.error.content}`);
try {
result.error = JSON.parse(result.error);
if (result.error.message.includes('slot unavailable')) {
// Throw an error to be caught by upstream callers
throw new Error('slot unavailable');
} else {
console.error(`llama.cpp error [${result.error.code} - ${result.error.type}]: ${result.error.message}`);
}
} catch(e) {
console.error(`llama.cpp error ${result.error}`)
}
}
if (result.error) {
result.error = JSON.parse(result.error);
console.error(`llama.cpp error: ${result.error.content}`);
}
}
}
}

159
examples/server/server.cpp
View File

@@ -396,7 +396,7 @@ struct server_queue {
// callback functions
std::function<void(server_task &)> callback_new_task;
std::function<void(server_task_multi &)> callback_finish_multitask;
std::function<void(void)> callback_run_slots;
std::function<void(void)> callback_update_slots;
// Add a new task to the end of the queue
int post(server_task task) {
@@ -435,8 +435,8 @@ struct server_queue {
}
// Register the function to be called when all slots data is ready to be processed
void on_run_slots(std::function<void(void)> callback) {
callback_run_slots = std::move(callback);
void on_update_slots(std::function<void(void)> callback) {
callback_update_slots = std::move(callback);
}
// Call when the state of one slot is changed
@@ -461,7 +461,7 @@ struct server_queue {
* - Wait until a new task arrives
* - Process the task (i.e. maybe copy data into slot)
* - Check if multitask is finished
* - Run all slots
* - Update all slots
*/
void start_loop() {
running = true;
@@ -499,9 +499,9 @@ struct server_queue {
}
// all tasks in the current loop is processed, slots data is now ready
LOG_VERBOSE("callback_run_slots", {});
LOG_VERBOSE("callback_update_slots", {});
callback_run_slots();
callback_update_slots();
LOG_VERBOSE("wait for new task", {});
{
@@ -805,9 +805,10 @@ struct server_context {
return last_used;
}
bool launch_slot_with_data(server_slot & slot, json data) const {
bool launch_slot_with_task(server_slot & slot, const server_task & task) {
slot_params default_params;
llama_sampling_params default_sparams;
auto & data = task.data;
if (data.count("__oaicompat") != 0) {
slot.oaicompat = true;
@@ -864,10 +865,15 @@ struct server_context {
{
const auto & prompt = data.find("prompt");
if (prompt == data.end()) {
slot.prompt = "";
send_error(task, "Either \"prompt\" or \"messages\" must be provided", ERROR_TYPE_INVALID_REQUEST);
return false;
} else {
slot.prompt = *prompt;
}
if (slot.prompt.is_array() && slot.prompt.size() == 0) {
send_error(task, "\"prompt\" cannot be an empty array", ERROR_TYPE_INVALID_REQUEST);
return false;
}
}
// penalize user-provided tokens
@@ -926,6 +932,7 @@ struct server_context {
if (logit_bias != data.end() && logit_bias->is_array()) {
const int n_vocab = llama_n_vocab(model);
for (const auto & el : *logit_bias) {
// TODO: we may want to throw errors here, in case "el" is incorrect
if (el.is_array() && el.size() == 2) {
float bias;
if (el[1].is_number()) {
@@ -985,6 +992,11 @@ struct server_context {
llama_sampling_free(slot.ctx_sampling);
}
slot.ctx_sampling = llama_sampling_init(slot.sparams);
if (slot.ctx_sampling == nullptr) {
// for now, the only error that may happen here is invalid grammar
send_error(task, "Failed to parse grammar", ERROR_TYPE_INVALID_REQUEST);
return false;
}
llama_set_rng_seed(ctx, slot.params.seed);
}
@@ -1226,15 +1238,23 @@ struct server_context {
};
}
void send_error(const server_task & task, const std::string & error) {
LOG_TEE("task %i - error: %s\n", task.id, error.c_str());
void send_error(const server_task & task, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
send_error(task.id, task.id_multi, error, type);
}
void send_error(const server_slot & slot, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
send_error(slot.id_task, slot.id_multi, error, type);
}
void send_error(const int id_task, const int id_multi, const std::string & error, const enum error_type type = ERROR_TYPE_SERVER) {
LOG_TEE("task %i - error: %s\n", id_task, error.c_str());
server_task_result res;
res.id = task.id;
res.id_multi = task.id_multi;
res.id = id_task;
res.id_multi = id_multi;
res.stop = false;
res.error = true;
res.data = { { "content", error } };
res.data = format_error_response(error, type);
queue_results.send(res);
}
@@ -1468,9 +1488,8 @@ struct server_context {
slot->infill = task.infill;
slot->embedding = task.embedding;
if (!launch_slot_with_data(*slot, task.data)) {
// send error result
send_error(task, "internal_error");
if (!launch_slot_with_task(*slot, task)) {
LOG_ERROR("error while launching slot", task.data);
break;
}
} break;
@@ -1587,7 +1606,7 @@ struct server_context {
queue_results.send(result);
}
bool update_slots() {
void update_slots() {
if (system_need_update) {
system_prompt_update();
}
@@ -1630,7 +1649,7 @@ struct server_context {
kv_cache_clear();
}
return true;
return;
}
}
@@ -1975,8 +1994,7 @@ struct server_context {
if (batch.n_tokens == 0) {
LOG_VERBOSE("no tokens to decode", {});
return true;
return;
}
LOG_VERBOSE("decoding batch", {
@@ -2033,7 +2051,13 @@ struct server_context {
if (n_batch == 1 || ret < 0) {
// if you get here, it means the KV cache is full - try increasing it via the context size
LOG_TEE("%s : failed to decode the batch, n_batch = %d, ret = %d\n", __func__, n_batch, ret);
return false;
for (auto & slot : slots) {
slot.state = SLOT_STATE_PROCESSING;
slot.command = SLOT_COMMAND_NONE;
slot.release();
send_error(slot, "Input prompt is too big compared to KV size. Please try increasing KV size.");
}
break; // break loop of n_batch
}
LOG_TEE("%s : failed to find free space in the KV cache, retrying with smaller n_batch = %d\n", __func__, n_batch / 2);
@@ -2042,12 +2066,12 @@ struct server_context {
n_batch /= 2;
i -= n_batch;
continue;
continue; // continue loop of n_batch
}
for (auto & slot : slots) {
if (slot.state != SLOT_STATE_PROCESSING || slot.i_batch < (int) i || slot.i_batch >= (int) (i + n_tokens)) {
continue;
continue; // continue loop of slots
}
// prompt evaluated for embedding
@@ -2055,7 +2079,7 @@ struct server_context {
send_embedding(slot, batch_view);
slot.release();
slot.i_batch = -1;
continue;
continue; // continue loop of slots
}
completion_token_output result;
@@ -2097,9 +2121,7 @@ struct server_context {
}
}
LOG_VERBOSE("slots updated", {});
return true;
LOG_VERBOSE("run slots completed", {});
}
json model_meta() const {
@@ -2745,32 +2767,32 @@ int main(int argc, char ** argv) {
svr->set_logger(log_server_request);
svr->set_exception_handler([](const httplib::Request &, httplib::Response & res, std::exception_ptr ep) {
const char fmt[] = "500 Internal Server Error\n%s";
auto res_error = [](httplib::Response & res, json error_data) {
json final_response {{"error", error_data}};
res.set_content(final_response.dump(), "application/json; charset=utf-8");
res.status = json_value(error_data, "code", 500);
};
char buf[BUFSIZ];
svr->set_exception_handler([&res_error](const httplib::Request &, httplib::Response & res, std::exception_ptr ep) {
std::string message;
try {
std::rethrow_exception(std::move(ep));
} catch (std::exception &e) {
snprintf(buf, sizeof(buf), fmt, e.what());
} catch (std::exception & e) {
message = e.what();
} catch (...) {
snprintf(buf, sizeof(buf), fmt, "Unknown Exception");
message = "Unknown Exception";
}
res.set_content(buf, "text/plain; charset=utf-8");
res.status = 500;
json formatted_error = format_error_response(message, ERROR_TYPE_SERVER);
LOG_VERBOSE("Got exception", formatted_error);
res_error(res, formatted_error);
});
svr->set_error_handler([](const httplib::Request &, httplib::Response & res) {
if (res.status == 401) {
res.set_content("Unauthorized", "text/plain; charset=utf-8");
}
if (res.status == 400) {
res.set_content("Invalid request", "text/plain; charset=utf-8");
}
svr->set_error_handler([&res_error](const httplib::Request &, httplib::Response & res) {
if (res.status == 404) {
res.set_content("File Not Found", "text/plain; charset=utf-8");
res_error(res, format_error_response("File Not Found", ERROR_TYPE_NOT_FOUND));
}
// for other error codes, we skip processing here because it's already done by res_error()
});
// set timeouts and change hostname and port
@@ -2835,7 +2857,7 @@ int main(int argc, char ** argv) {
// Middlewares
//
auto middleware_validate_api_key = [&sparams](const httplib::Request & req, httplib::Response & res) {
auto middleware_validate_api_key = [&sparams, &res_error](const httplib::Request & req, httplib::Response & res) {
// TODO: should we apply API key to all endpoints, including "/health" and "/models"?
static const std::set<std::string> protected_endpoints = {
"/props",
@@ -2876,8 +2898,7 @@ int main(int argc, char ** argv) {
// API key is invalid or not provided
// TODO: make another middleware for CORS related logic
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
res.set_content("Unauthorized: Invalid API Key", "text/plain; charset=utf-8");
res.status = 401; // Unauthorized
res_error(res, format_error_response("Invalid API Key", ERROR_TYPE_AUTHENTICATION));
LOG_WARNING("Unauthorized: Invalid API Key", {});
@@ -2940,21 +2961,18 @@ int main(int argc, char ** argv) {
}
case SERVER_STATE_LOADING_MODEL:
{
res.set_content(R"({"status": "loading model"})", "application/json");
res.status = 503; // HTTP Service Unavailable
res_error(res, format_error_response("Loading model", ERROR_TYPE_UNAVAILABLE));
} break;
case SERVER_STATE_ERROR:
{
res.set_content(R"({"status": "error", "error": "Model failed to load"})", "application/json");
res.status = 500; // HTTP Internal Server Error
res_error(res, format_error_response("Model failed to load", ERROR_TYPE_SERVER));
} break;
}
};
const auto handle_slots = [&](const httplib::Request &, httplib::Response & res) {
if (!sparams.slots_endpoint) {
res.status = 501;
res.set_content("This server does not support slots endpoint.", "text/plain; charset=utf-8");
res_error(res, format_error_response("This server does not support slots endpoint.", ERROR_TYPE_NOT_SUPPORTED));
return;
}
@@ -2978,8 +2996,7 @@ int main(int argc, char ** argv) {
const auto handle_metrics = [&](const httplib::Request &, httplib::Response & res) {
if (!sparams.metrics_endpoint) {
res.status = 501;
res.set_content("This server does not support metrics endpoint.", "text/plain; charset=utf-8");
res_error(res, format_error_response("This server does not support metrics endpoint.", ERROR_TYPE_NOT_SUPPORTED));
return;
}
@@ -3090,7 +3107,7 @@ int main(int argc, char ** argv) {
res.set_content(data.dump(), "application/json; charset=utf-8");
};
const auto handle_completions = [&ctx_server](const httplib::Request & req, httplib::Response & res) {
const auto handle_completions = [&ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
json data = json::parse(req.body);
@@ -3105,8 +3122,7 @@ int main(int argc, char ** argv) {
if (!result.error && result.stop) {
res.set_content(result.data.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
} else {
res.status = 500;
res.set_content(result.data["content"], "text/plain; charset=utf-8");
res_error(res, result.data);
}
ctx_server.queue_results.remove_waiting_task_id(id_task);
@@ -3186,7 +3202,7 @@ int main(int argc, char ** argv) {
res.set_content(models.dump(), "application/json; charset=utf-8");
};
const auto handle_chat_completions = [&ctx_server, &sparams](const httplib::Request & req, httplib::Response & res) {
const auto handle_chat_completions = [&ctx_server, &sparams, &res_error](const httplib::Request & req, httplib::Response & res) {
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
json data = oaicompat_completion_params_parse(ctx_server.model, json::parse(req.body), sparams.chat_template);
@@ -3204,8 +3220,7 @@ int main(int argc, char ** argv) {
res.set_content(result_oai.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
} else {
res.status = 500;
res.set_content(result.data["content"], "text/plain; charset=utf-8");
res_error(res, result.data);
}
ctx_server.queue_results.remove_waiting_task_id(id_task);
} else {
@@ -3259,7 +3274,7 @@ int main(int argc, char ** argv) {
}
};
const auto handle_infill = [&ctx_server](const httplib::Request & req, httplib::Response & res) {
const auto handle_infill = [&ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
json data = json::parse(req.body);
@@ -3274,8 +3289,7 @@ int main(int argc, char ** argv) {
if (!result.error && result.stop) {
res.set_content(result.data.dump(-1, ' ', false, json::error_handler_t::replace), "application/json; charset=utf-8");
} else {
res.status = 404;
res.set_content(result.data["content"], "text/plain; charset=utf-8");
res_error(res, result.data);
}
ctx_server.queue_results.remove_waiting_task_id(id_task);
@@ -3346,7 +3360,7 @@ int main(int argc, char ** argv) {
return res.set_content(data.dump(), "application/json; charset=utf-8");
};
const auto handle_embeddings = [&params, &ctx_server](const httplib::Request & req, httplib::Response & res) {
const auto handle_embeddings = [&params, &ctx_server, &res_error](const httplib::Request & req, httplib::Response & res) {
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
if (!params.embedding) {
res.status = 501;
@@ -3375,8 +3389,8 @@ int main(int argc, char ** argv) {
std::string content = body["content"];
prompts.push_back(content);
} else {
// TODO @ngxson : should return an error here
prompts.push_back("");
res_error(res, format_error_response("\"input\" or \"content\" must be provided", ERROR_TYPE_INVALID_REQUEST));
return;
}
// process all prompts
@@ -3392,9 +3406,14 @@ int main(int argc, char ** argv) {
// get the result
server_task_result result = ctx_server.queue_results.recv(id_task);
ctx_server.queue_results.remove_waiting_task_id(id_task);
// append to the responses
responses.push_back(result.data);
if (!result.error) {
// append to the responses
responses.push_back(result.data);
} else {
// error received, ignore everything else
res_error(res, result.data);
return;
}
}
// write JSON response
@@ -3488,7 +3507,7 @@ int main(int argc, char ** argv) {
&server_context::process_single_task, &ctx_server, std::placeholders::_1));
ctx_server.queue_tasks.on_finish_multitask(std::bind(
&server_context::on_finish_multitask, &ctx_server, std::placeholders::_1));
ctx_server.queue_tasks.on_run_slots(std::bind(
ctx_server.queue_tasks.on_update_slots(std::bind(
&server_context::update_slots, &ctx_server));
ctx_server.queue_results.on_multitask_update(std::bind(
&server_queue::update_multitask,

2
examples/server/tests/features/steps/steps.py
View File

@@ -801,7 +801,7 @@ async def oai_chat_completions(user_prompt,
stream=enable_streaming,
seed=seed
)
except openai.error.APIError as e:
except openai.error.AuthenticationError as e:
if expect_api_error is not None and expect_api_error:
return 401
else:

51
examples/server/utils.hpp
View File

@@ -14,6 +14,17 @@
using json = nlohmann::json;
// https://community.openai.com/t/openai-chat-list-of-error-codes-and-types/357791/11
enum error_type {
ERROR_TYPE_INVALID_REQUEST,
ERROR_TYPE_AUTHENTICATION,
ERROR_TYPE_SERVER,
ERROR_TYPE_NOT_FOUND,
ERROR_TYPE_PERMISSION,
ERROR_TYPE_UNAVAILABLE, // custom error
ERROR_TYPE_NOT_SUPPORTED, // custom error
};
extern bool server_verbose;
extern bool server_log_json;
@@ -542,3 +553,43 @@ static json format_detokenized_response(const std::string & content) {
{"content", content}
};
}
static json format_error_response(const std::string & message, const enum error_type type) {
std::string type_str;
int code = 500;
switch (type) {
case ERROR_TYPE_INVALID_REQUEST:
type_str = "invalid_request_error";
code = 400;
break;
case ERROR_TYPE_AUTHENTICATION:
type_str = "authentication_error";
code = 401;
break;
case ERROR_TYPE_NOT_FOUND:
type_str = "not_found_error";
code = 404;
break;
case ERROR_TYPE_SERVER:
type_str = "server_error";
code = 500;
break;
case ERROR_TYPE_PERMISSION:
type_str = "permission_error";
code = 403;
break;
case ERROR_TYPE_NOT_SUPPORTED:
type_str = "not_supported_error";
code = 501;
break;
case ERROR_TYPE_UNAVAILABLE:
type_str = "unavailable_error";
code = 503;
break;
}
return json {
{"code", code},
{"message", message},
{"type", type_str},
};
}