Enum BackendConfig 

pub enum BackendConfig {
    Local {
        path: PathBuf,
    },
    S3 {
        bucket: String,
        region: String,
        endpoint: Option<String>,
    },
    Redis {
        url: String,
        ttl_secs: Option<u64>,
    },
    Pg {
        url: String,
        max_conns: u32,
    },
    Tiered {
        l1: Box<BackendConfig>,
        l2: Box<BackendConfig>,
        l3: Box<BackendConfig>,
        write_policy: WritePolicy,
    },
}

Storage backend selection.

Dispatched by build_backend to the concrete backend implementation. The #[serde(tag = "type", rename_all = "lowercase")] shape is the stable JSON wire format; a config file’s "type": "local" / "type": "tiered" etc. is the operator’s vocabulary.

Variants

Local

Local filesystem storage.

Fields

path: PathBuf

Root directory for NAR and narinfo files.

S3

S3-compatible object storage.

Fields

bucket: String

region: String

endpoint: Option<String>

Redis

Redis L1 hot cache (requires the redis-client feature to construct).

Fields

url: String

Connection URL, e.g. redis://redis.super-cache-ci.svc:6379.

ttl_secs: Option<u64>

Optional per-write TTL in seconds; None relies on maxmemory LRU.

Pg

Postgres L2 durable cache tier (requires the postgres feature to construct).

Fields

url: String

Connection URL, e.g. postgres://user@pg.svc:5432/sui.

max_conns: u32

Connection-pool ceiling.

Tiered

Tiered L1 → L2 → L3 resolver composing three nested backends.

The canonical super-cache shape: l1: Redis, l2: Pg, l3: S3. Any nesting is legal (the arms recurse), so a deployment can pick {disk | tiered} — or any composition — purely by config.

Fields

l1: Box<BackendConfig>

L1 hot tier (typically Redis).

l2: Box<BackendConfig>

L2 durable tier (typically Pg).

l3: Box<BackendConfig>

L3 object tier (typically S3).

write_policy: WritePolicy

How puts propagate across the tiers.

Trait Implementations

impl Clone for BackendConfig

fn clone(&self) -> BackendConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BackendConfig

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

Formats the value using the given formatter.

impl Default for BackendConfig

fn default() -> BackendConfig

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for BackendConfig

fn deserialize<__D>( __deserializer: __D, ) -> Result<BackendConfig, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for BackendConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.