Struct PdEnvelope 

#[repr(C)]
pub struct PdEnvelope {
    pub message_id: u128,
    pub source: u128,
    pub destination: u128,
    pub type_tag: u64,
    pub payload_len: u32,
    pub flags: u32,
    pub correlation_id: u64,
}

Fixed-size C-compatible message header passed to plugin lifecycle hooks.

The layout is identical to palladium_actor::Envelope (80 bytes, repr(C)), so the engine can reinterpret Envelope bytes directly without copying.

All multi-byte fields are little-endian.

Field offsets:

offset  0 – 15 : message_id    (u128)
offset 16 – 31 : source        (u128, actor AddrHash)
offset 32 – 47 : destination   (u128, actor AddrHash)
offset 48 – 55 : type_tag      (u64,  message type discriminant)
offset 56 – 59 : payload_len   (u32)
offset 60 – 63 : flags         (u32,  see FLAG_* constants)
offset 64 – 71 : correlation_id(u64)
offset 72 – 79 : (implicit repr(C) padding — write as zeros)

Total size: 80 bytes (verified by ENVELOPE_SIZE).

Fields

message_id: u128

Unique message identifier (engine-assigned).

source: u128

Sender’s AddrHash (path + generation, packed into a u128).

destination: u128

Recipient’s AddrHash.

type_tag: u64

Message type discriminant (FNV-1a of the fully-qualified type name).

payload_len: u32

Byte length of the accompanying payload buffer.

flags: u32

Bitfield flags — see FLAG_RESPONSE and FLAG_PRIORITY_MASK.

correlation_id: u64

Response correlation: matches the message_id of the request.

Trait Implementations

impl Clone for PdEnvelope

fn clone(&self) -> PdEnvelope

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PdEnvelope

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

Formats the value using the given formatter.

impl Copy for PdEnvelope