Fix segfault on empty vehicles

CHANGELOG.md

@@ -35,6 +35,7 @@
 
 - Crash when input is valid JSON but not an object (#1172)
 - Capacity array check consistency (#1086)
+- Segfault when using the C++ API with empty vehicles (#1187)
 
 #### Internals
 

src/structures/vroom/input/input.cpp

@@ -172,6 +172,19 @@ void Input::check_job(Job& job) {
     _all_locations_have_coords && job.location.has_coordinates();
 }
 
+void Input::run_basic_checks() const {
+  if (vehicles.empty()) {
+    throw InputException("No vehicle defined.");
+  }
+  if (jobs.empty()) {
+    throw InputException("No task defined.");
+  }
+  if (_geometry && !_all_locations_have_coords) {
+    // Early abort when info is required with missing coordinates.
+    throw InputException("Route geometry request with missing coordinates.");
+  }
+}
+
 void Input::add_job(const Job& job) {
   if (job.type != JOB_TYPE::SINGLE) {
     throw InputException("Wrong job type.");
@@ -1106,10 +1119,7 @@ Solution Input::solve(unsigned nb_searches,
                       unsigned nb_thread,
                       const Timeout& timeout,
                       const std::vector<HeuristicParameters>& h_param) {
-  if (_geometry && !_all_locations_have_coords) {
-    // Early abort when info is required with missing coordinates.
-    throw InputException("Route geometry request with missing coordinates.");
-  }
+  run_basic_checks();
 
   if (_has_initial_routes) {
     set_vehicle_steps_ranks();
@@ -1189,10 +1199,7 @@ Solution Input::solve(unsigned nb_searches,
 
 Solution Input::check(unsigned nb_thread) {
 #if USE_LIBGLPK
-  if (_geometry && !_all_locations_have_coords) {
-    // Early abort when info is required with missing coordinates.
-    throw InputException("Route geometry request with missing coordinates.");
-  }
+  run_basic_checks();
 
   set_vehicle_steps_ranks();
 

src/structures/vroom/input/input.h

@@ -94,6 +94,8 @@ class Input {
   void check_amount_size(const Amount& amount);
   void check_job(Job& job);
 
+  void run_basic_checks() const;
+
   UserCost check_cost_bound(const Matrix<UserCost>& matrix) const;
 
   void set_skills_compatibility();

src/utils/input_parser.cpp

@@ -521,19 +521,15 @@ void parse(Input& input, const std::string& input_str, bool geometry) {
     throw InputException("Input root is not an object.");
   }
 
-  bool has_jobs = json_input.HasMember("jobs") &&
-                  json_input["jobs"].IsArray() && !json_input["jobs"].Empty();
-  bool has_shipments = json_input.HasMember("shipments") &&
-                       json_input["shipments"].IsArray() &&
-                       !json_input["shipments"].Empty();
-  if (!has_jobs && !has_shipments) {
-    throw InputException("Invalid jobs or shipments.");
-  }
-
-  if (!json_input.HasMember("vehicles") || !json_input["vehicles"].IsArray() ||
-      json_input["vehicles"].Empty()) {
+  if (!json_input.HasMember("vehicles") || !json_input["vehicles"].IsArray()) {
     throw InputException("Invalid vehicles.");
   }
+  if (json_input["vehicles"].Empty()) {
+    // This is tested upstream upon solving but we still need to do it
+    // here to access first vehicle and retrieve amount_size.
+    throw InputException("No vehicle defined.");
+  }
+
   const auto& first_vehicle = json_input["vehicles"][0];
   check_id(first_vehicle, "vehicle");
   bool first_vehicle_has_capacity = (first_vehicle.HasMember("capacity") &&
@@ -551,16 +547,21 @@ void parse(Input& input, const std::string& input_str, bool geometry) {
     input.add_vehicle(get_vehicle(json_vehicle, amount_size));
   }
 
-  // Add all tasks.
-  if (has_jobs) {
-    // Add the jobs.
+  if (json_input.HasMember("jobs")) {
+    if (!json_input["jobs"].IsArray()) {
+      throw InputException("Invalid jobs.");
+    }
+
     for (rapidjson::SizeType i = 0; i < json_input["jobs"].Size(); ++i) {
       input.add_job(get_job(json_input["jobs"][i], amount_size));
     }
   }
 
-  if (has_shipments) {
-    // Add the shipments.
+  if (json_input.HasMember("shipments")) {
+    if (!json_input["shipments"].IsArray()) {
+      throw InputException("Invalid shipments.");
+    }
+
     for (rapidjson::SizeType i = 0; i < json_input["shipments"].Size(); ++i) {
       auto& json_shipment = json_input["shipments"][i];
       check_shipment(json_shipment);