Add options to conditionally stop the recording

README.md

@@ -74,6 +74,18 @@ Messages written to the bag will use the latest received value of `/clock` for t
 Note: Until the first `/clock` message is received, the recorder will not write any messages.
 Before that message is received, the time is 0, which leads to a significant time jump once simulation time begins, making the bag essentially unplayable if messages are written first with time 0 and then time N from `/clock`.
 
+#### Recording with termination conditions
+
+rosbag2 can be configured to stop recording after a certain size, duration or number of messages is reached (considering **all** the bag files of the current recording). By default the recording will continue until an external signal is stopping it, but this can be changed using the CLI options.
+
+_Stopping by size_: `ros2 bag record -a --max-recording-size 100000` will stop the recording after it becomes greater than 100 kilobytes. This option defaults to `0`, which means the recording will not stop based on size.
+
+_Stopping by duration_: `ros2 bag record -a --max-recording-duration 9000` will stop the recording after `9000` seconds. This option defaults to `0`, which means the recording will not stop based on duration.
+
+_Stopping by number of messages_: `ros2 bag record -a --max-recording-messages 1000` will stop the recording after `1000` messages have been recorded. This option defaults to `0`, which means the recording will not stop based on number of messages.
+
+If multiple stopping conditions are enabled, the recording will stop at whichever threshold is reached first.
+
 #### Splitting files during recording
 
 rosbag2 offers the capability to split bag files when they reach a maximum size or after a specified duration. By default rosbag2 will record all data into a single bag file, but this can be changed using the CLI options.
@@ -253,6 +265,9 @@ output_bags:
   storage_id: ""  # will use the default storage plugin, if unspecified
   max_bagfile_size: 0
   max_bagfile_duration: 0
+  max_recording_size: 0
+  max_recording_duration: 0
+  max_recording_messages: 0
   storage_preset_profile: ""
   storage_config_uri: ""
   all_topics: false

ros2bag/ros2bag/verb/record.py

@@ -145,6 +145,18 @@ def add_recorder_arguments(parser: ArgumentParser) -> None:
              'Default: %(default)d, recording written in single bagfile and splitting '
              'is disabled. If both splitting by size and duration are enabled, '
              'the bag will split at whichever threshold is reached first.')
+    parser.add_argument(
+        '--max-recording-size', type=int, default=0,
+        help='Maximum size in bytes before the recording will be stopped. '
+             'Default: %(default)d, recording will not stop based on size.')
+    parser.add_argument(
+        '--max-recording-duration', type=int, default=0,
+        help='Maximum duration in seconds before the recording will be stopped. '
+             'Default: %(default)d, recording will not stop based on duration.')
+    parser.add_argument(
+        '--max-recording-messages', type=int, default=0,
+        help='Maximum number of messages before the recording will be stopped. '
+             'Default: %(default)d, recording will not stop based on number of messages.')
     parser.add_argument(
         '--max-cache-size', type=int, default=100 * 1024 * 1024,
         help='Maximum size (in bytes) of messages to hold in each buffer of cache. '
@@ -325,7 +337,10 @@ def main(self, *, args):  # noqa: D102
             storage_preset_profile=args.storage_preset_profile,
             storage_config_uri=storage_config_file,
             snapshot_mode=args.snapshot_mode,
-            custom_data=custom_data
+            custom_data=custom_data,
+            max_recording_size=args.max_recording_size,
+            max_recording_duration=args.max_recording_duration,
+            max_recording_messages=args.max_recording_messages,
         )
         record_options = RecordOptions()
         record_options.all_topics = args.all_topics or args.all

rosbag2_cpp/include/rosbag2_cpp/bag_events.hpp

@@ -38,6 +38,8 @@ enum class BagEvent
   WRITE_SPLIT,
   /// Reading of the input bag file has gone over a split, opening the next file.
   READ_SPLIT,
+  /// The recording has reached a predetermined stopping condition.
+  STOP_RECORDING
 };
 
 /**
@@ -51,7 +53,19 @@ struct BagSplitInfo
   std::string opened_file;
 };
 
+/**
+ * \brief The information structure passed to callbacks for the STOP_RECORDING event.
+ */
+struct StopRecordingInfo
+{
+  /// The base folder where the recording was taking place.
+  std::string base_folder;
+  /// The reason for stopping the recording.
+  std::string reason;
+};
+
 using BagSplitCallbackType = std::function<void (BagSplitInfo &)>;
+using BagStopRecordingCallbackType = std::function<void (StopRecordingInfo &)>;
 
 /**
  * \brief Use this structure to register callbacks with Writers.
@@ -60,6 +74,8 @@ struct WriterEventCallbacks
 {
   /// The callback to call for the WRITE_SPLIT event.
   BagSplitCallbackType write_split_callback;
+  /// The callback to call for the STOP_RECORDING event.
+  BagStopRecordingCallbackType stop_recording_callback;
 };
 
 /**

rosbag2_cpp/include/rosbag2_cpp/stop_recording_options.hpp

@@ -0,0 +1,32 @@
+// Copyright 2025 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ROSBAG2_CPP__STOP_RECORDING_OPTIONS_HPP_
+#define ROSBAG2_CPP__STOP_RECORDING_OPTIONS_HPP_
+
+#include <cstdint>
+
+namespace rosbag2_cpp
+{
+
+struct StopRecordingOptions
+{
+  uint64_t max_duration;
+  uint64_t max_size;
+  uint64_t max_messages;
+};
+
+}  // namespace rosbag2_cpp
+
+#endif  // ROSBAG2_CPP__STOP_RECORDING_OPTIONS_HPP_

rosbag2_cpp/include/rosbag2_cpp/writer.hpp

@@ -27,6 +27,7 @@
 
 #include "rosbag2_cpp/bag_events.hpp"
 #include "rosbag2_cpp/converter_options.hpp"
+#include "rosbag2_cpp/stop_recording_options.hpp"
 #include "rosbag2_cpp/visibility_control.hpp"
 #include "rosbag2_cpp/writers/sequential_writer.hpp"
 

rosbag2_cpp/include/rosbag2_cpp/writers/sequential_writer.hpp

@@ -158,6 +158,10 @@ class ROSBAG2_CPP_PUBLIC SequentialWriter
   void execute_bag_split_callbacks(
     const std::string & closed_file, const std::string & opened_file);
 
+  void signal_stop_recording(const std::string & out_stop_reason);
+
+  void execute_signal_stop_recording_callbacks(const std::string & out_stop_reason);
+
   void switch_to_next_storage();
 
   std::string format_storage_uri(
@@ -183,6 +187,16 @@ class ROSBAG2_CPP_PUBLIC SequentialWriter
   bool should_split_bagfile(
     const std::chrono::time_point<std::chrono::high_resolution_clock> & current_time) const;
 
+  // Checks if the recording needs to be stopped due to predefined conditions
+  // before writing the current message.
+  bool should_stop_recording_pre_write(
+    const std::chrono::time_point<std::chrono::high_resolution_clock> & current_time,
+    std::string & stop_reason) const;
+
+  // Checks if the recording needs to be stopped due to predefined conditions
+  // after writing the current message.
+  bool should_stop_recording_post_write(std::string & stop_reason) const;
+
   // Checks if the message to be written is within accepted time range
   bool message_within_accepted_time_range(
     const rcutils_time_point_value_t current_time) const;
@@ -200,6 +214,15 @@ class ROSBAG2_CPP_PUBLIC SequentialWriter
   get_writeable_message(
     std::shared_ptr<const rosbag2_storage::SerializedBagMessage> message);
 
+  // Used to track the approximate size of the previously splitted bags.
+  uint64_t previous_bags_size_ {0};
+
+  // Used to track the number of messages in the previously splitted bags.
+  uint64_t previous_bags_num_messages_ {0};
+
+  // Used to track if the stop recording signal has been already sent.
+  bool signaled_stop_recording_ {false};
+
 private:
   /// Helper method to write messages while also updating tracked metadata.
   void write_messages(

rosbag2_cpp/src/rosbag2_cpp/writers/sequential_writer.cpp

@@ -327,6 +327,9 @@ void SequentialWriter::switch_to_next_storage()
     message_cache_->log_dropped();
   }
 
+  previous_bags_size_ += storage_->get_bagfile_size();
+  previous_bags_num_messages_ += metadata_.files.back().message_count;
+
   storage_->update_metadata(metadata_);
   storage_options_.uri = format_storage_uri(
     base_folder_,
@@ -385,8 +388,30 @@ void SequentialWriter::split_bagfile()
   (void)split_bagfile_local();
 }
 
+void SequentialWriter::signal_stop_recording(const std::string & reason)
+{
+  if (signaled_stop_recording_) {
+    return;
+  }
+  execute_signal_stop_recording_callbacks(reason);
+  signaled_stop_recording_ = true;
+}
+
+void SequentialWriter::execute_signal_stop_recording_callbacks(
+  const std::string & reason)
+{
+  auto info = std::make_shared<bag_events::StopRecordingInfo>();
+  info->base_folder = base_folder_;
+  info->reason = reason;
+  callback_manager_.execute_callbacks(bag_events::BagEvent::STOP_RECORDING, info);
+}
+
 void SequentialWriter::write(std::shared_ptr<const rosbag2_storage::SerializedBagMessage> message)
 {
+  if (signaled_stop_recording_) {
+    return;
+  }
+
   if (!is_open_) {
     throw std::runtime_error("Bag is not open. Call open() before writing.");
   }
@@ -415,6 +440,12 @@ void SequentialWriter::write(std::shared_ptr<const rosbag2_storage::SerializedBa
     is_first_message_ = false;
   }
 
+  std::string out_stop_reason;
+  if (should_stop_recording_pre_write(message_timestamp, out_stop_reason)) {
+    signal_stop_recording(out_stop_reason);
+    return;
+  }
+
   if (!storage_options_.snapshot_mode && should_split_bagfile(message_timestamp)) {
     split_bagfile();
     metadata_.files.back().starting_time = message_timestamp;
@@ -442,6 +473,11 @@ void SequentialWriter::write(std::shared_ptr<const rosbag2_storage::SerializedBa
     // Otherwise, use cache buffer
     message_cache_->push(converted_msg);
   }
+
+  if (should_stop_recording_post_write(out_stop_reason)) {
+    signal_stop_recording(out_stop_reason);
+    return;
+  }
 }
 
 bool SequentialWriter::take_snapshot()
@@ -508,6 +544,52 @@ bool SequentialWriter::message_within_accepted_time_range(
   return true;
 }
 
+bool SequentialWriter::should_stop_recording_pre_write(
+  const std::chrono::time_point<std::chrono::high_resolution_clock> & current_time,
+  std::string & out_stop_reason) const
+{
+  // Stopping by time
+  if (storage_options_.max_recording_duration !=
+    rosbag2_storage::storage_interfaces::MAX_RECORDING_DURATION_NO_STOP)
+  {
+    auto max_duration_ns = std::chrono::duration_cast<std::chrono::nanoseconds>(
+      std::chrono::seconds(storage_options_.max_recording_duration));
+    if ((current_time - metadata_.starting_time) > max_duration_ns) {
+      out_stop_reason = "max duration";
+      return true;
+    }
+  }
+
+  return false;
+}
+
+bool SequentialWriter::should_stop_recording_post_write(std::string & out_stop_reason) const
+{
+  // Stopping by size
+  if (storage_options_.max_recording_size !=
+    rosbag2_storage::storage_interfaces::MAX_RECORDING_SIZE_NO_STOP)
+  {
+    if (previous_bags_size_ + storage_->get_bagfile_size() >= storage_options_.max_recording_size) {
+      out_stop_reason = "max size";
+      return true;
+    }
+  }
+
+  // Stopping by number of messages
+  if (storage_options_.max_recording_messages !=
+    rosbag2_storage::storage_interfaces::MAX_RECORDING_MESSAGES_NO_STOP)
+  {
+    if (previous_bags_num_messages_ + metadata_.files.back().message_count >=
+      storage_options_.max_recording_messages)
+    {
+      out_stop_reason = "max messages";
+      return true;
+    }
+  }
+
+  return false;
+}
+
 void SequentialWriter::finalize_metadata()
 {
   metadata_.bag_size = 0;
@@ -563,6 +645,11 @@ void SequentialWriter::add_event_callbacks(const bag_events::WriterEventCallback
       callbacks.write_split_callback,
       bag_events::BagEvent::WRITE_SPLIT);
   }
+  if (callbacks.stop_recording_callback) {
+    callback_manager_.add_event_callback(
+      callbacks.stop_recording_callback,
+      bag_events::BagEvent::STOP_RECORDING);
+  }
 }
 
 }  // namespace writers

rosbag2_interfaces/CMakeLists.txt

@@ -15,6 +15,7 @@ find_package(rosidl_default_generators REQUIRED)
 
 rosidl_generate_interfaces(${PROJECT_NAME}
   "msg/ReadSplitEvent.msg"
+  "msg/StopRecordingEvent.msg"
   "msg/WriteSplitEvent.msg"
   "srv/Burst.srv"
   "srv/GetRate.srv"

rosbag2_interfaces/msg/StopRecordingEvent.msg

@@ -0,0 +1,8 @@
+# The full path of the base folder where the recording was taking place.
+string base_folder
+
+# The reason for stopping the recording.
+string reason
+
+# The fully qualified node name of the event sender
+string node_name

rosbag2_py/rosbag2_py/_storage.pyi

@@ -101,13 +101,16 @@ class StorageOptions:
     max_bagfile_duration: int
     max_bagfile_size: int
     max_cache_size: int
+    max_recording_duration: int
+    max_recording_messages: int
+    max_recording_size: int
     snapshot_mode: bool
     start_time_ns: int
     storage_config_uri: str
     storage_id: str
     storage_preset_profile: str
     uri: str
-    def __init__(self, uri: str, storage_id: str = ..., max_bagfile_size: int = ..., max_bagfile_duration: int = ..., max_cache_size: int = ..., storage_preset_profile: str = ..., storage_config_uri: str = ..., snapshot_mode: bool = ..., start_time_ns: int = ..., end_time_ns: int = ..., custom_data: Dict[str, str] = ...) -> None: ...
+    def __init__(self, uri: str, storage_id: str = ..., max_bagfile_size: int = ..., max_bagfile_duration: int = ..., max_cache_size: int = ..., storage_preset_profile: str = ..., storage_config_uri: str = ..., snapshot_mode: bool = ..., start_time_ns: int = ..., end_time_ns: int = ..., custom_data: Dict[str, str] = ..., max_recording_size: int = ..., max_recording_duration: int = ..., max_recording_messages: int = ...) -> None: ...
 
 class TopicInformation:
     message_count: int

rosbag2_py/src/rosbag2_py/_storage.cpp

@@ -83,7 +83,7 @@ PYBIND11_MODULE(_storage, m) {
   .def(
     pybind11::init<
       std::string, std::string, uint64_t, uint64_t, uint64_t, std::string, std::string, bool,
-      int64_t, int64_t, KEY_VALUE_MAP>(),
+      int64_t, int64_t, KEY_VALUE_MAP, uint64_t, uint64_t, uint64_t>(),
     pybind11::arg("uri"),
     pybind11::arg("storage_id") = "",
     pybind11::arg("max_bagfile_size") = 0,
@@ -94,7 +94,10 @@ PYBIND11_MODULE(_storage, m) {
     pybind11::arg("snapshot_mode") = false,
     pybind11::arg("start_time_ns") = -1,
     pybind11::arg("end_time_ns") = -1,
-    pybind11::arg("custom_data") = KEY_VALUE_MAP{})
+    pybind11::arg("custom_data") = KEY_VALUE_MAP{},
+    pybind11::arg("max_recording_size") = 0,
+    pybind11::arg("max_recording_duration") = 0,
+    pybind11::arg("max_recording_messages") = 0)
   .def_readwrite("uri", &rosbag2_storage::StorageOptions::uri)
   .def_readwrite("storage_id", &rosbag2_storage::StorageOptions::storage_id)
   .def_readwrite(
@@ -123,7 +126,16 @@ PYBIND11_MODULE(_storage, m) {
     &rosbag2_storage::StorageOptions::end_time_ns)
   .def_readwrite(
     "custom_data",
-    &rosbag2_storage::StorageOptions::custom_data);
+    &rosbag2_storage::StorageOptions::custom_data)
+  .def_readwrite(
+    "max_recording_size",
+    &rosbag2_storage::StorageOptions::max_recording_size)
+  .def_readwrite(
+    "max_recording_duration",
+    &rosbag2_storage::StorageOptions::max_recording_duration)
+  .def_readwrite(
+    "max_recording_messages",
+    &rosbag2_storage::StorageOptions::max_recording_messages);
 
   pybind11::class_<rosbag2_storage::StorageFilter>(m, "StorageFilter")
   .def(