Struct Header 

pub struct Header { /* private fields */ }

Message header information.

PostgreSQL wire protocol messages start with a 5-byte header:

• 1 byte: message type tag
• 4 bytes: message length (BigEndian, including the length field itself)

Implementations

impl Header

pub fn parse(buf: &[u8]) -> Result<Option<Header>>

Parses a message header from a buffer.

Returns Ok(None) if the buffer is too short (< 5 bytes). Returns Err if the parsed length is invalid (< 4).

Arguments

• buf - Buffer containing at least the first 5 bytes of a message

Errors

Returns io::ErrorKind::InvalidData if the parsed length field is less than 4 (which is the minimum valid length — the 4-byte length field itself).

pub fn tag(self) -> u8

Returns the message tag.

pub fn len(self) -> i32

Returns the message length (including itself).

pub fn is_empty(self) -> bool

Returns true if the message length is 0.

Note: A valid message always has a length of at least 4 (for the length field itself), so this should always return false for valid messages.

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Header

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for Header