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Require reserve_size in create_buffer to reduce realloc overhead (#8715)

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
J. Nick Koston 2025-05-08 00:50:20 -05:00 committed by GitHub
parent ef2621aa54
commit 9e64e71cdf
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3 changed files with 13 additions and 8 deletions
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6
esphome/components/api/api_connection.cpp
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@ -212,8 +212,7 @@ void APIConnection::loop() {
msg_size += 1 + ProtoSize::varint(to_send) + to_send; msg_size += 1 + ProtoSize::varint(to_send) + to_send;
ProtoSize::add_bool_field(msg_size, 1, done); ProtoSize::add_bool_field(msg_size, 1, done);
auto buffer = this->create_buffer(); auto buffer = this->create_buffer(msg_size);
buffer.get_buffer()->reserve(msg_size);
// fixed32 key = 1; // fixed32 key = 1;
buffer.encode_fixed32(1, esp32_camera::global_esp32_camera->get_object_id_hash()); buffer.encode_fixed32(1, esp32_camera::global_esp32_camera->get_object_id_hash());
// bytes data = 2; // bytes data = 2;
@ -1807,8 +1806,7 @@ bool APIConnection::try_send_log_message(int level, const char *tag, const char
msg_size += 1 + api::ProtoSize::varint(static_cast<uint32_t>(line_length)) + line_length; msg_size += 1 + api::ProtoSize::varint(static_cast<uint32_t>(line_length)) + line_length;
// Create a pre-sized buffer // Create a pre-sized buffer
auto buffer = this->create_buffer(); auto buffer = this->create_buffer(msg_size);
buffer.get_buffer()->reserve(msg_size);
// Encode the message (SubscribeLogsResponse) // Encode the message (SubscribeLogsResponse)
buffer.encode_uint32(1, static_cast<uint32_t>(level)); // LogLevel level = 1 buffer.encode_uint32(1, static_cast<uint32_t>(level)); // LogLevel level = 1

3
esphome/components/api/api_connection.h
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@ -312,9 +312,10 @@ class APIConnection : public APIServerConnection {
void on_fatal_error() override; void on_fatal_error() override;
void on_unauthenticated_access() override; void on_unauthenticated_access() override;
void on_no_setup_connection() override; void on_no_setup_connection() override;
ProtoWriteBuffer create_buffer() override { ProtoWriteBuffer create_buffer(uint32_t reserve_size) override {
// FIXME: ensure no recursive writes can happen // FIXME: ensure no recursive writes can happen
this->proto_write_buffer_.clear(); this->proto_write_buffer_.clear();
this->proto_write_buffer_.reserve(reserve_size);
return {&this->proto_write_buffer_}; return {&this->proto_write_buffer_};
} }
bool send_buffer(ProtoWriteBuffer buffer, uint32_t message_type) override; bool send_buffer(ProtoWriteBuffer buffer, uint32_t message_type) override;

12
esphome/components/api/proto.h
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@ -311,7 +311,14 @@ class ProtoService {
virtual void on_fatal_error() = 0; virtual void on_fatal_error() = 0;
virtual void on_unauthenticated_access() = 0; virtual void on_unauthenticated_access() = 0;
virtual void on_no_setup_connection() = 0; virtual void on_no_setup_connection() = 0;
virtual ProtoWriteBuffer create_buffer() = 0; /**
* Create a buffer with a reserved size.
* @param reserve_size The number of bytes to pre-allocate in the buffer. This is a hint
* to optimize memory usage and avoid reallocations during encoding.
* Implementations should aim to allocate at least this size.
* @return A ProtoWriteBuffer object with the reserved size.
*/
virtual ProtoWriteBuffer create_buffer(uint32_t reserve_size) = 0;
virtual bool send_buffer(ProtoWriteBuffer buffer, uint32_t message_type) = 0; virtual bool send_buffer(ProtoWriteBuffer buffer, uint32_t message_type) = 0;
virtual bool read_message(uint32_t msg_size, uint32_t msg_type, uint8_t *msg_data) = 0; virtual bool read_message(uint32_t msg_size, uint32_t msg_type, uint8_t *msg_data) = 0;
@ -321,8 +328,7 @@ class ProtoService {
msg.calculate_size(msg_size); msg.calculate_size(msg_size);
// Create a pre-sized buffer // Create a pre-sized buffer
auto buffer = this->create_buffer(); auto buffer = this->create_buffer(msg_size);
buffer.get_buffer()->reserve(msg_size);
// Encode message into the buffer // Encode message into the buffer
msg.encode(buffer); msg.encode(buffer);