From bcb60f306f1b93ee865b5161da9844fdb527bcaa Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Wed, 28 Feb 2024 20:46:10 +0300
Subject: [PATCH 1/6] server: error handling

---
 Makefile                   |  2 +-
 common/CMakeLists.txt      |  3 +-
 common/error.h             | 24 +++++++++++++++
 common/grammar-parser.cpp  |  5 ++--
 common/sampling.cpp        | 11 +++++--
 examples/server/README.md  | 14 +++++++++
 examples/server/server.cpp | 61 +++++++++++++++++++++++++++++++-------
 7 files changed, 102 insertions(+), 18 deletions(-)
 create mode 100644 common/error.h

diff --git a/Makefile b/Makefile
index 4f26c0463fcd8..241bbeb5aa42b 100644
--- a/Makefile
+++ b/Makefile
@@ -634,7 +634,7 @@ OBJS += ggml-alloc.o ggml-backend.o ggml-quants.o
 llama.o: llama.cpp ggml.h ggml-alloc.h ggml-backend.h ggml-cuda.h ggml-metal.h llama.h
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 
-COMMON_H_DEPS = common/common.h common/sampling.h common/log.h
+COMMON_H_DEPS = common/common.h common/sampling.h common/log.h common/error.h
 COMMON_DEPS   = common.o sampling.o grammar-parser.o build-info.o
 
 common.o: common/common.cpp $(COMMON_H_DEPS)
diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index f79acfef1d133..3859bba813868 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -57,7 +57,8 @@ add_library(${TARGET} STATIC
     grammar-parser.cpp
     train.h
     train.cpp
-    )
+    error.h
+)
 
 if (BUILD_SHARED_LIBS)
     set_target_properties(${TARGET} PROPERTIES POSITION_INDEPENDENT_CODE ON)
diff --git a/common/error.h b/common/error.h
new file mode 100644
index 0000000000000..1669c4918ea79
--- /dev/null
+++ b/common/error.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdio>
+#include <exception>
+#include <string>
+
+class llama_error : public std::exception
+{
+private:
+    std::string _id;
+    std::string _description;
+
+public:
+    llama_error(const std::string & id, const std::string & description)
+    :
+    _id(id),
+    _description(description)
+    {
+        fprintf(stderr, "ERROR [%s]: %s\n", id.c_str(), description.c_str());
+    }
+
+    inline const std::string & id() const { return _id; }
+    inline const std::string & description() const { return _description; }
+};
diff --git a/common/grammar-parser.cpp b/common/grammar-parser.cpp
index bf89a96f3617f..3d8e8bef950ce 100644
--- a/common/grammar-parser.cpp
+++ b/common/grammar-parser.cpp
@@ -1,4 +1,6 @@
 #include "grammar-parser.h"
+#include "error.h"
+
 #include <cstdint>
 #include <cwchar>
 #include <string>
@@ -280,8 +282,7 @@ namespace grammar_parser {
             }
             return state;
         } catch (const std::exception & err) {
-            fprintf(stderr, "%s: error parsing grammar: %s\n", __func__, err.what());
-            return parse_state();
+            throw llama_error("grammar.invalid", std::string(__func__) + ": error parsing grammar: " + err.what());
         }
     }
 
diff --git a/common/sampling.cpp b/common/sampling.cpp
index e67096bea6932..b0b960b732b7d 100644
--- a/common/sampling.cpp
+++ b/common/sampling.cpp
@@ -1,4 +1,5 @@
 #include "sampling.h"
+#include "error.h"
 
 struct llama_sampling_context * llama_sampling_init(const struct llama_sampling_params & params) {
     struct llama_sampling_context * result = new llama_sampling_context();
@@ -8,13 +9,17 @@ struct llama_sampling_context * llama_sampling_init(const struct llama_sampling_
 
     // if there is a grammar, parse it
     if (!params.grammar.empty()) {
-        result->parsed_grammar = grammar_parser::parse(params.grammar.c_str());
+        try {
+            result->parsed_grammar = grammar_parser::parse(params.grammar.c_str());
+        } catch (const llama_error & err) {
+            delete result;
+            throw err;
+        }
 
         // will be empty (default) if there are parse errors
         if (result->parsed_grammar.rules.empty()) {
-            fprintf(stderr, "%s: failed to parse grammar\n", __func__);
             delete result;
-            return nullptr;
+            throw llama_error("grammar.empty", std::string(__func__) + ": empty grammar");
         }
 
         std::vector<const llama_grammar_element *> grammar_rules(result->parsed_grammar.c_rules());
diff --git a/examples/server/README.md b/examples/server/README.md
index 0e9bd7fd404ba..58227877060cc 100644
--- a/examples/server/README.md
+++ b/examples/server/README.md
@@ -275,6 +275,20 @@ Notice that each `probs` is an array of length `n_probs`.
 - `tokens_evaluated`: Number of tokens evaluated in total from the prompt
 - `truncated`: Boolean indicating if the context size was exceeded during generation, i.e. the number of tokens provided in the prompt (`tokens_evaluated`) plus tokens generated (`tokens predicted`) exceeded the context size (`n_ctx`)
 
+In case of an error the error details will be returned as follows:
+```json
+{
+  "error": {
+    "description": "parse: error parsing grammar: expecting name at (",
+    "id": "grammar.invalid"
+  }
+}
+```
+where:
+- `description` - human-readable description
+- `id` - unique ID for this error type
+
+
 - **POST** `/tokenize`: Tokenize a given text.
 
     *Options:*
diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 080fa9bd5702c..f9f93ccca6abc 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -23,6 +23,7 @@
 #include "index.js.hpp"
 #include "completion.js.hpp"
 #include "json-schema-to-grammar.mjs.hpp"
+#include "error.h"
 
 #include <cstddef>
 #include <thread>
@@ -674,6 +675,15 @@ struct llama_server_context
             slot->prompt = "";
         }
 
+        if (
+            (slot->prompt.is_string() && slot->prompt.get<std::string>().empty())
+            ||
+            (slot->prompt.is_array() && slot->prompt.empty())
+        )
+        {
+            throw llama_error("prompt.empty", "The prompt must not be empty");
+        }
+
         slot->sparams.penalty_prompt_tokens.clear();
         slot->sparams.use_penalty_prompt_tokens = false;
         const auto &penalty_prompt = data.find("penalty_prompt");
@@ -1132,6 +1142,28 @@ struct llama_server_context
         queue_results.send(res);
     }
 
+    static json error_to_json(const llama_error& error)
+    {
+        return {
+            { "error", {
+                { "id", error.id() },
+                { "description", error.description() }
+            } }
+        };
+    }
+
+    void send_error(task_server& task, const llama_error& error)
+    {
+        LOG_TEE("task %i - error: %s - %s\n", task.id, error.id().c_str(), error.description().c_str());
+        task_result res;
+        res.id = task.id;
+        res.multitask_id = task.multitask_id;
+        res.stop = false;
+        res.error = true;
+        res.result_json = { { "content", error_to_json(error).dump() } };
+        queue_results.send(res);
+    }
+
     json get_formated_generation(llama_client_slot &slot)
     {
         const auto eos_bias = slot.sparams.logit_bias.find(llama_token_eos(model));
@@ -1336,10 +1368,6 @@ struct llama_server_context
                 split_multiprompt_task(task_id, task);
             }
         } else {
-            // an empty prompt can make slot become buggy
-            if (task.data.contains("prompt") && task.data["prompt"].is_string() && task.data["prompt"].get<std::string>().empty()) {
-                task.data["prompt"] = " "; // add a space so that we have one token
-            }
             queue_tasks.post(task);
         }
     }
@@ -1487,11 +1515,15 @@ struct llama_server_context
                 slot->task_id      = task.id;
                 slot->multitask_id = task.multitask_id;
 
-                if (!launch_slot_with_data(slot, task.data))
-                {
-                    // send error result
-                    send_error(task, "internal_error");
-                    break;
+                try {
+                    if (!launch_slot_with_data(slot, task.data))
+                    {
+                        // send error result
+                        send_error(task, "internal_error");
+                        break;
+                    }
+                } catch (const llama_error & err) {
+                    send_error(task, err);
                 }
             } break;
             case TASK_TYPE_CANCEL: { // release slot linked with the task id
@@ -3129,7 +3161,15 @@ int main(int argc, char **argv)
                 if (!validate_api_key(req, res)) {
                     return;
                 }
-                json data = json::parse(req.body);
+                json data;
+                try {
+                    data = json::parse(req.body);
+                } catch(const json::exception & json_err) {
+                    const auto err = llama_error("request.invalid_json", std::string("Invalid JSON: ") + json_err.what());
+                    const auto err_json = llama_server_context::error_to_json(err).dump();
+                    res.set_content(err_json, "text/plain; charset=utf-8");
+                    return;
+                }
                 const int task_id = llama.queue_tasks.get_new_id();
                 llama.queue_results.add_waiting_task_id(task_id);
                 llama.request_completion(task_id, data, false, false, -1);
@@ -3141,7 +3181,6 @@ int main(int argc, char **argv)
                     }
                     else
                     {
-                        res.status = 404;
                         res.set_content(result.result_json["content"], "text/plain; charset=utf-8");
                     }
                     llama.queue_results.remove_waiting_task_id(task_id);

From 8a8aaee714dd4f200e4534995ebd28934c6ab08c Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Fri, 8 Mar 2024 20:26:27 +0300
Subject: [PATCH 2/6] server: error handling: fixes after merge

---
 examples/server/server.cpp | 45 +++++++++++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 5 deletions(-)

diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index de247f12faf4d..06707bb516313 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -1211,6 +1211,28 @@ struct server_context {
         queue_results.send(res);
     }
 
+    static json error_to_json(const llama_error& error)
+    {
+        return {
+            { "error", {
+                { "id", error.id() },
+                { "description", error.description() }
+            } }
+        };
+    }
+
+    void send_error(const server_task & task, const llama_error& error)
+    {
+        LOG_TEE("task %i - error: %s - %s\n", task.id, error.id().c_str(), error.description().c_str());
+        server_task_result res;
+        res.id = task.id;
+        res.id_multi = task.id_multi;
+        res.stop = false;
+        res.error = true;
+        res.data = { { "content", error_to_json(error).dump() } };
+        queue_results.send(res);
+    }
+
     void send_partial_response(server_slot & slot, completion_token_output tkn) {
         server_task_result res;
         res.id       = slot.id_task;
@@ -1436,10 +1458,15 @@ 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");
-                        break;
+                    try {
+                        if (!launch_slot_with_data(*slot, task.data))
+                        {
+                            // send error result
+                            send_error(task, "internal_error");
+                            break;
+                        }
+                    } catch (const llama_error & err) {
+                        send_error(task, err);
                     }
                 } break;
             case SERVER_TASK_TYPE_CANCEL:
@@ -2953,7 +2980,15 @@ int main(int argc, char ** argv) {
             return;
         }
 
-        json data = json::parse(req.body);
+        json data;
+        try {
+            data = json::parse(req.body);
+        } catch (const json::exception & json_err) {
+            const auto err = llama_error("request.invalid_json", std::string("Invalid JSON: ") + json_err.what());
+            const auto err_json = server_context::error_to_json(err).dump();
+            res.set_content(err_json, "text/plain; charset=utf-8");
+            return;
+        }
 
         const int id_task = ctx_server.queue_tasks.get_new_id();
 

From 444f32e3703b04f446d127c5decb73eb69a26534 Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Fri, 8 Mar 2024 20:32:52 +0300
Subject: [PATCH 3/6] server: error handling: rename error fields to match
 OpenAI API

---
 common/error.h             | 16 ++++++++--------
 examples/server/server.cpp |  6 +++---
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/common/error.h b/common/error.h
index 1669c4918ea79..79ad2c6926f89 100644
--- a/common/error.h
+++ b/common/error.h
@@ -7,18 +7,18 @@
 class llama_error : public std::exception
 {
 private:
-    std::string _id;
-    std::string _description;
+    std::string _type;
+    std::string _message;
 
 public:
-    llama_error(const std::string & id, const std::string & description)
+    llama_error(const std::string & type, const std::string & message)
     :
-    _id(id),
-    _description(description)
+    _type(type),
+    _message(message)
     {
-        fprintf(stderr, "ERROR [%s]: %s\n", id.c_str(), description.c_str());
+        fprintf(stderr, "ERROR [%s]: %s\n", type.c_str(), message.c_str());
     }
 
-    inline const std::string & id() const { return _id; }
-    inline const std::string & description() const { return _description; }
+    inline const std::string & type() const { return _type; }
+    inline const std::string & message() const { return _message; }
 };
diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 06707bb516313..88661a944db77 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -1215,15 +1215,15 @@ struct server_context {
     {
         return {
             { "error", {
-                { "id", error.id() },
-                { "description", error.description() }
+                { "type", error.type() },
+                { "message", error.message() }
             } }
         };
     }
 
     void send_error(const server_task & task, const llama_error& error)
     {
-        LOG_TEE("task %i - error: %s - %s\n", task.id, error.id().c_str(), error.description().c_str());
+        LOG_TEE("task %i - error: %s - %s\n", task.id, error.type().c_str(), error.message().c_str());
         server_task_result res;
         res.id = task.id;
         res.id_multi = task.id_multi;

From a4f25f879311f826264e9ff08061017c1c1ca771 Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Sat, 9 Mar 2024 12:01:23 +0300
Subject: [PATCH 4/6] server: error handling: fix double free of ctx_sampling

---
 examples/server/server.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 88661a944db77..420bc644dac4b 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -958,6 +958,7 @@ struct server_context {
         {
             if (slot.ctx_sampling != nullptr) {
                 llama_sampling_free(slot.ctx_sampling);
+                slot.ctx_sampling = nullptr;
             }
             slot.ctx_sampling = llama_sampling_init(slot.sparams);
             llama_set_rng_seed(ctx, slot.params.seed);

From bd5cca11b097c8ccb29dddcab9b7446ca5a9f37f Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Sat, 9 Mar 2024 12:07:44 +0300
Subject: [PATCH 5/6] server: error handling: convert all unhandled exceptions
 to API errors

---
 examples/server/server.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 420bc644dac4b..d1e48b54403a1 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -24,6 +24,7 @@
 #include <chrono>
 #include <condition_variable>
 #include <cstddef>
+#include <exception>
 #include <set>
 #include <mutex>
 #include <thread>
@@ -1468,6 +1469,8 @@ struct server_context {
                         }
                     } catch (const llama_error & err) {
                         send_error(task, err);
+                    } catch (const std::exception & err) {
+                        send_error(task, llama_error("unhandled", err.what()));
                     }
                 } break;
             case SERVER_TASK_TYPE_CANCEL:

From 7809dbca32a041bea90239818e7a85001a15a39b Mon Sep 17 00:00:00 2001
From: ZXED <zxed@alkatrazstudio.net>
Date: Sat, 9 Mar 2024 13:00:46 +0300
Subject: [PATCH 6/6] server: error handling: always use new format for API
 errors

---
 examples/server/completion.js.hpp    | 470 ++++++++++++++-------------
 examples/server/public/completion.js |  20 +-
 examples/server/server.cpp           |  17 +-
 3 files changed, 248 insertions(+), 259 deletions(-)

diff --git a/examples/server/completion.js.hpp b/examples/server/completion.js.hpp
index f5e696e17edfe..0524a235b75da 100644
--- a/examples/server/completion.js.hpp
+++ b/examples/server/completion.js.hpp
@@ -231,255 +231,257 @@ unsigned char completion_js[] = {
   0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
   0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74,
   0x2e, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20,
-  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x72, 0x65,
-  0x73, 0x75, 0x6c, 0x74, 0x2e, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x20, 0x3d,
-  0x20, 0x4a, 0x53, 0x4f, 0x4e, 0x2e, 0x70, 0x61, 0x72, 0x73, 0x65, 0x28,
-  0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x2e, 0x65, 0x72, 0x72, 0x6f, 0x72,
-  0x29, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x74, 0x72,
+  0x79, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74,
+  0x2e, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x20, 0x3d, 0x20, 0x4a, 0x53, 0x4f,
+  0x4e, 0x2e, 0x70, 0x61, 0x72, 0x73, 0x65, 0x28, 0x4a, 0x53, 0x4f, 0x4e,
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+  0x74, 0x65, 0x6e, 0x74, 0x29, 0x2e, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x3b,
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+  0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x29, 0x20, 0x7b,
+  0x0a, 0x20, 0x20, 0x20, 0x20, 0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20, 0x70,
+  0x72, 0x6f, 0x70, 0x73, 0x20, 0x3d, 0x20, 0x61, 0x77, 0x61, 0x69, 0x74,
+  0x20, 0x66, 0x65, 0x74, 0x63, 0x68, 0x28, 0x22, 0x2f, 0x70, 0x72, 0x6f,
+  0x70, 0x73, 0x22, 0x29, 0x2e, 0x74, 0x68, 0x65, 0x6e, 0x28, 0x72, 0x20,
+  0x3d, 0x3e, 0x20, 0x72, 0x2e, 0x6a, 0x73, 0x6f, 0x6e, 0x28, 0x29, 0x29,
+  0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61,
+  0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67,
+  0x73, 0x20, 0x3d, 0x20, 0x70, 0x72, 0x6f, 0x70, 0x73, 0x2e, 0x64, 0x65,
+  0x66, 0x61, 0x75, 0x6c, 0x74, 0x5f, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61,
+  0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67,
+  0x73, 0x3b, 0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x72, 0x65, 0x74,
+  0x75, 0x72, 0x6e, 0x20, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x69,
+  0x6f, 0x6e, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x3b,
+  0x0a, 0x7d, 0x0a
 };
-unsigned int completion_js_len = 5782;
+unsigned int completion_js_len = 5799;
diff --git a/examples/server/public/completion.js b/examples/server/public/completion.js
index ab38a7b409df1..ad5c485d2c254 100644
--- a/examples/server/public/completion.js
+++ b/examples/server/public/completion.js
@@ -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: ${result.error.content}`);
+            try {
+              result.error = JSON.parse(JSON.parse(result.error).content).error;
+              if (result.error.message.includes('slot unavailable')) {
+                // Throw an error to be caught by upstream callers
+                throw new Error('slot unavailable');
+              } else {
+                console.error(`llama.cpp error [${result.error.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}`);
-          }
         }
       }
     }
diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index d1e48b54403a1..2dd7dfca16ac3 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -1200,19 +1200,6 @@ 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());
-
-        server_task_result res;
-        res.id       = task.id;
-        res.id_multi = task.id_multi;
-        res.stop     = false;
-        res.error    = true;
-        res.data     = { { "content", error } };
-
-        queue_results.send(res);
-    }
-
     static json error_to_json(const llama_error& error)
     {
         return {
@@ -1409,7 +1396,7 @@ struct server_context {
     void split_multiprompt_task(int id_multi, const server_task & multiprompt_task) {
         const int prompt_count = multiprompt_task.data.at("prompt").size();
         if (prompt_count <= 1) {
-            send_error(multiprompt_task, "error while handling multiple prompts");
+            send_error(multiprompt_task, llama_error("prompt.multi.empty", "error while handling multiple prompts"));
             return;
         }
 
@@ -1464,7 +1451,7 @@ struct server_context {
                         if (!launch_slot_with_data(*slot, task.data))
                         {
                             // send error result
-                            send_error(task, "internal_error");
+                            send_error(task, llama_error("unknown", "Unknown error"));
                             break;
                         }
                     } catch (const llama_error & err) {