Module frontend 

Frontend (client → server) message encoding.

Messages are appended to a caller-owned [BytesMut] so that a full request (Parse + Describe + Bind + Execute + Sync) can be assembled in one buffer and written with a single syscall.

Counts and lengths taken from the caller are range-checked before being written: a silently truncated length prefix makes the server reinterpret the rest of the buffer as new protocol messages.

Constants

MAX_VALUE_COUNT

Maximum number of values in one Bind or COPY row.

Functions

begin

Starts a tagged message, writing the tag and a placeholder length.

bind_finish

Finishes a Bind message.

bind_start

Starts a Bind message; call write_param for each value, then bind_finish.

cancel_request

Encodes a CancelRequest message (no tag; sent on a fresh connection).

close

Encodes a Close (kind is b'S' for a statement or b'P' for a portal).

copy_data

Encodes a CopyData.

copy_done

Encodes a CopyDone.

copy_fail

Encodes a CopyFail.

describe

Encodes a Describe (kind is b'S' for a statement or b'P' for a portal).

execute

Encodes an Execute.

finish

Patches the length field written by begin.

flush

Encodes a Flush.

parse

Encodes a Parse.

password

Encodes a cleartext password message (PasswordMessage).

put_cstr

Appends a raw C string terminated by a NUL byte.

query

Encodes a simple Query.

sasl_initial_response

Encodes a SASLInitialResponse.

sasl_response

Encodes a SASLResponse.

ssl_request

Encodes an SSLRequest message.

startup

Encodes the startup message (no tag).

sync

Encodes a Sync.

terminate

Encodes a Terminate.

write_param

Writes one Bind parameter; None is encoded as SQL NULL.