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[api] Memory optimizations for API frame helper buffering (#9724)

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This commit is contained in:
J. Nick Koston
2025-07-20 12:20:35 -10:00
committed by GitHub
parent 534a1cf2e7
commit e474a33abd
2 changed files with 45 additions and 46 deletions
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13
esphome/components/api/api_frame_helper.h
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@@ -116,22 +116,23 @@ class APIFrameHelper {
// Buffer containing data to be sent
struct SendBuffer {
std::vector<uint8_t> data;
uint16_t offset{0}; // Current offset within the buffer (uint16_t to reduce memory usage)
std::unique_ptr<uint8_t[]> data;
uint16_t size{0}; // Total size of the buffer
uint16_t offset{0}; // Current offset within the buffer
// Using uint16_t reduces memory usage since ESPHome API messages are limited to UINT16_MAX (65535) bytes
uint16_t remaining() const { return static_cast<uint16_t>(data.size()) - offset; }
const uint8_t *current_data() const { return data.data() + offset; }
uint16_t remaining() const { return size - offset; }
const uint8_t *current_data() const { return data.get() + offset; }
};
// Common implementation for writing raw data to socket
APIError write_raw_(const struct iovec *iov, int iovcnt);
APIError write_raw_(const struct iovec *iov, int iovcnt, uint16_t total_write_len);
// Try to send data from the tx buffer
APIError try_send_tx_buf_();
// Helper method to buffer data from IOVs
void buffer_data_from_iov_(const struct iovec *iov, int iovcnt, uint16_t total_write_len);
void buffer_data_from_iov_(const struct iovec *iov, int iovcnt, uint16_t total_write_len, uint16_t offset);
template<typename StateEnum>
APIError write_raw_(const struct iovec *iov, int iovcnt, socket::Socket *socket, std::vector<uint8_t> &tx_buf,
const std::string &info, StateEnum &state, StateEnum failed_state);