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J. Nick Koston
f0edf10f95
Replace StaticVector<iovec> + writev() scatter-gather in the batch write path with contiguous single-buffer write() calls. Plaintext: compact messages via memmove to close 0-3 byte varint header gaps, then write_raw_fast_buf_. Noise: messages are already contiguous (fixed 7-byte header + 16-byte MAC fills all reserved space), switch directly to write_raw_fast_buf_. Fix LOG_PACKET_SENDING to log after write/enqueue to prevent re-entrant log sends from corrupting the shared buffer before data is sent. Consolidate the macro to api_frame_helper.cpp and expose via out-of-line log_packet_sending_() helper. Remove write_raw_fast_iov_ (no remaining callers) and change encrypt_noise_message_ to return uint16_t length instead of iovec.
