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Code Issues Releases Wiki Activity

[api] Optimize message buffer allocation and eliminate redundant methods (#10231)

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This commit is contained in:
J. Nick Koston
2025-08-14 20:26:09 -05:00
committed by GitHub
parent 5d18afcd99
commit 5fa84439c2
2 changed files with 24 additions and 49 deletions
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32
esphome/components/api/api_connection.cpp
View File

@@ -289,16 +289,26 @@ uint16_t APIConnection::encode_message_to_buffer(ProtoMessage &msg, uint8_t mess
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)
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
conn->prepare_first_message_buffer(shared_buf, header_padding, total_calculated_size);
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_calculated_size);
shared_buf.resize(current_size + footer_size + header_padding);
}
// Encode directly into buffer
msg.encode(buffer);
size_t size_before_encode = shared_buf.size();
msg.encode({&shared_buf});
// Calculate actual encoded size (not including header that was already added)
size_t actual_payload_size = shared_buf.size() - size_before_encode;
@@ -1620,14 +1630,6 @@ 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 +1737,7 @@ 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;
}

41
esphome/components/api/api_connection.h
View File

@@ -252,44 +252,21 @@ class APIConnection : public APIServerConnection {
// Get header padding size - used for both reserve and insert
uint8_t header_padding = this->helper_->frame_header_padding();
// Get shared buffer from parent server
std::vector<uint8_t> &shared_buf = this->parent_->get_shared_buffer_ref();
this->prepare_first_message_buffer(shared_buf, header_padding,
reserve_size + header_padding + this->helper_->frame_footer_size());
return {&shared_buf};
}
void prepare_first_message_buffer(std::vector<uint8_t> &shared_buf, size_t header_padding, size_t total_size) {
shared_buf.clear();
// Reserve space for header padding + message + footer
// - Header padding: space for protocol headers (7 bytes for Noise, 6 for Plaintext)
// - Footer: space for MAC (16 bytes for Noise, 0 for Plaintext)
shared_buf.reserve(reserve_size + header_padding + this->helper_->frame_footer_size());
shared_buf.reserve(total_size);
// Resize to add header padding so message encoding starts at the correct position
shared_buf.resize(header_padding);
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);
@@ -297,10 +274,6 @@ class APIConnection : public APIServerConnection {
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_();