Enum DurabilityTier 

pub enum DurabilityTier {
    None,
    Snapshot,
    Dedup,
    Stream,
}

A workload’s declared durability tier — where a second copy of its state lives, and how far behind that copy is allowed to be (R850-P4).

The three non-None variants name turso-backup’s three implemented tiers. They are spelled here rather than imported because workload-spec is a leaf crate every fleet node links and turso-backup is a service-side dependency; the coupling that matters is the vocabulary, not the types.

Variants

None

Deliberately no second copy. State lives only where the container runs and is gone when that node is. Legitimate for caches and scratch — and it is a statement, which is why it is not the same as declaring nothing (see WorkloadSpec::durability).

Snapshot

turso-backup tier 1a — periodic full VACUUM INTO snapshot to the object store. Recovery point is the last snapshot, so the loss window is the snapshot interval, which this declaration does not carry: a snapshot-tier workload’s RPO is whatever schedules it.

Dedup

turso-backup tier 1b — incremental page-dedup snapshot. Same recovery point semantics as Self::Snapshot; cheaper per run, so in practice a shorter interval.

Stream

turso-backup tier 2 — WAL-frame streaming with restore by frame replay. The only tier with a bounded, declarable loss window; see WorkloadSpec::durability’s rpo-seconds and turso_backup::stream::DEFAULT_RPO_TARGET (120 s), which is what an undeclared RPO means in practice.

Implementations

impl DurabilityTier

pub fn as_str(&self) -> &'static str

The wire/TOML spelling, so a diagnostic and the file it points at agree.

pub fn ships_bytes(&self) -> bool

Whether this tier puts bytes in an object store — i.e. whether there is a copy to hydrate from after the node is gone.

Trait Implementations

impl Clone for DurabilityTier

fn clone(&self) -> DurabilityTier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DurabilityTier

impl Debug for DurabilityTier

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DurabilityTier

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for DurabilityTier

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

Formats the value using the given formatter.

impl Eq for DurabilityTier

impl PartialEq for DurabilityTier

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for DurabilityTier

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DurabilityTier