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Code Issues Releases Wiki Activity

[api] Optimize message buffer allocation and eliminate redundant methods

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This commit is contained in:
J. Nick Koston
2025-08-13 22:10:15 -05:00
parent 6b5e43ca72
commit b43ca2bbab
2 changed files with 25 additions and 56 deletions
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50
esphome/components/api/api_connection.cpp
View File

@@ -281,34 +281,42 @@ uint16_t APIConnection::encode_message_to_buffer(ProtoMessage &msg, uint8_t mess
const uint8_t header_padding = conn->helper_->frame_header_padding();
const uint8_t footer_size = conn->helper_->frame_footer_size();
// Calculate total size with padding for buffer allocation
size_t total_calculated_size = calculated_size + header_padding + footer_size;
// Calculate total size with padding
size_t total_size = calculated_size + header_padding + footer_size;
// Check if it fits
if (total_calculated_size > remaining_size) {
if (total_size > remaining_size) {
return 0; // Doesn't fit
}
// Allocate buffer space - pass payload size, allocation functions add header/footer space
ProtoWriteBuffer buffer = is_single ? conn->allocate_single_message_buffer(calculated_size)
: conn->allocate_batch_message_buffer(calculated_size);
// Get buffer size after allocation (which includes header padding)
// Get buffer and prepare it inline
std::vector<uint8_t> &shared_buf = conn->parent_->get_shared_buffer_ref();
size_t size_before_encode = shared_buf.size();
if (is_single || conn->flags_.batch_first_message) {
// Single message or first batch message
shared_buf.clear();
shared_buf.reserve(total_size);
shared_buf.resize(header_padding);
if (conn->flags_.batch_first_message) {
conn->flags_.batch_first_message = false;
}
} else {
// Batch message second or later
// Add padding for previous message footer + this message header
size_t current_size = shared_buf.size();
shared_buf.reserve(current_size + total_size);
shared_buf.resize(current_size + footer_size + header_padding);
}
// Encode directly into buffer
ProtoWriteBuffer buffer{&shared_buf};
size_t size_before_encode = shared_buf.size();
msg.encode(buffer);
// Calculate actual encoded size (not including header that was already added)
size_t actual_payload_size = shared_buf.size() - size_before_encode;
// Return actual total size (header + actual payload + footer)
size_t actual_total_size = header_padding + actual_payload_size + footer_size;
// Verify that calculate_size() returned the correct value
assert(calculated_size == actual_payload_size);
return static_cast<uint16_t>(actual_total_size);
return static_cast<uint16_t>(total_size);
}
#ifdef USE_BINARY_SENSOR
@@ -1620,14 +1628,6 @@ bool APIConnection::schedule_batch_() {
return true;
}
ProtoWriteBuffer APIConnection::allocate_single_message_buffer(uint16_t size) { return this->create_buffer(size); }
ProtoWriteBuffer APIConnection::allocate_batch_message_buffer(uint16_t size) {
ProtoWriteBuffer result = this->prepare_message_buffer(size, this->flags_.batch_first_message);
this->flags_.batch_first_message = false;
return result;
}
void APIConnection::process_batch_() {
// Ensure PacketInfo remains trivially destructible for our placement new approach
static_assert(std::is_trivially_destructible<PacketInfo>::value,
@@ -1735,7 +1735,7 @@ void APIConnection::process_batch_() {
}
remaining_size -= payload_size;
// Calculate where the next message's header padding will start
// Current buffer size + footer space (that prepare_message_buffer will add for this message)
// Current buffer size + footer space for this message
current_offset = shared_buf.size() + footer_size;
}

31
esphome/components/api/api_connection.h
View File

@@ -265,42 +265,11 @@ class APIConnection : public APIServerConnection {
return {&shared_buf};
}
// Prepare buffer for next message in batch
ProtoWriteBuffer prepare_message_buffer(uint16_t message_size, bool is_first_message) {
// Get reference to shared buffer (it maintains state between batch messages)
std::vector<uint8_t> &shared_buf = this->parent_->get_shared_buffer_ref();
if (is_first_message) {
shared_buf.clear();
}
size_t current_size = shared_buf.size();
// Calculate padding to add:
// - First message: just header padding
// - Subsequent messages: footer for previous message + header padding for this message
size_t padding_to_add = is_first_message
? this->helper_->frame_header_padding()
: this->helper_->frame_header_padding() + this->helper_->frame_footer_size();
// Reserve space for padding + message
shared_buf.reserve(current_size + padding_to_add + message_size);
// Resize to add the padding bytes
shared_buf.resize(current_size + padding_to_add);
return {&shared_buf};
}
bool try_to_clear_buffer(bool log_out_of_space);
bool send_buffer(ProtoWriteBuffer buffer, uint8_t message_type) override;
std::string get_client_combined_info() const { return this->client_info_.get_combined_info(); }
// Buffer allocator methods for batch processing
ProtoWriteBuffer allocate_single_message_buffer(uint16_t size);
ProtoWriteBuffer allocate_batch_message_buffer(uint16_t size);
protected:
// Helper function to handle authentication completion
void complete_authentication_();