Struct StackKey 

pub struct StackKey {
    pub stack_name: String,
    pub version: String,
    pub vcpu_count: u8,
    pub mem_size_mib: u32,
}

Identifier for a pool entry’s bucket. Same (stack_name, version, vcpu_count, mem_size_mib) share a pool; different identities have separate pools so handoff doesn’t mismatch.

The four-tuple matches what a downstream blueprint can guarantee about a pre-restored VM:

• stack_name + version pin the rootfs / sidecar image,
• vcpu_count + mem_size_mib pin the machine config baked into the snapshot (Firecracker rejects restores into a differently-shaped VM).

All four must match for a warm entry to be valid for the caller’s request.

Fields

stack_name: String

Logical stack identifier (e.g. "node20", "python311-pytorch").

version: String

Version of the stack (e.g. sidecar version, rootfs revision).

vcpu_count: u8

vCPU count the snapshot was taken with — must match the restore target.

mem_size_mib: u32

Memory size (MiB) the snapshot was taken with — must match on restore.

Trait Implementations

impl Clone for StackKey

fn clone(&self) -> StackKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StackKey

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

Formats the value using the given formatter.

impl Hash for StackKey

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for StackKey

fn eq(&self, other: &StackKey) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for StackKey

impl StructuralPartialEq for StackKey