Struct BlobFallbackConfig 

pub struct BlobFallbackConfig {

    pub blobs: Option<BlobBackend>,
    pub s3_bucket: Option<String>,
    pub s3_endpoint: Option<String>,
    pub s3_region: Option<String>,
    pub s3_path_style: bool,
    pub s3_credential: Option<S3CredentialConfig>,
    pub gcs_bucket: Option<String>,
    pub gcs_endpoint: Option<String>,
    pub gcs_anonymous: bool,
    pub azure_account: Option<String>,
    pub azure_container: Option<String>,
    pub azure_access_key: Option<String>,
    pub azure_emulator: bool,
    pub secondary_timeout_secs: Option<u64>,
}

[serve.blob_fallback] — a read-only SECONDARY blob backend for a zero-downtime backend switch (blob-backend migration Part 2). Same backend-descriptor shape as the PRIMARY ([serve]’s blobs/s3_*/gcs_*/azure_* fields) so a source/dest is fully described by config, plus its OWN optional s3_credential (the secondary can source its base S3 credential from the sealed [secrets] store via its own boatramp:/env: ref, #505). Constructed exactly like the primary but with NO watcher provisioning (a read-only drain source never watches). Serving wraps FallbackStorage::new(primary, secondary, …) so a primary miss on a boatramp-owned key falls through to this secondary; writes/deletes are primary-only.

The secondary is never handed to the blob-upload/STS minter — external ingress mints against the PRIMARY only (the new backend the client should upload to), so this credential never reaches the minter path.

Fields

blobs: Option<BlobBackend>

The secondary blob backend (fs/s3/gcs/azure) — the OLD backend to fall back to on a primary miss. Absent ⇒ fs (the default, matching the primary’s blobs default).

s3_bucket: Option<String>

S3 bucket (secondary blobs = s3).

s3_endpoint: Option<String>

S3 endpoint URL (a MinIO/R2/Tigris endpoint) for the secondary.

s3_region: Option<String>

S3 region for the secondary.

s3_path_style: bool

Use S3 path-style addressing (MinIO) for the secondary.

s3_credential: Option<S3CredentialConfig>

The secondary’s OWN node-level sealed base S3 credential source (#505) — resolved through the SAME resolve_s3_credential path as the primary (same fail-closed posture, no second parser). Absent ⇒ the ambient AWS env chain (unchanged).

gcs_bucket: Option<String>

GCS bucket (secondary blobs = gcs).

gcs_endpoint: Option<String>

GCS storage endpoint URL (a fake-gcs-server emulator) for the secondary.

gcs_anonymous: bool

Skip GCS credential resolution (anonymous — the emulator) for the secondary.

azure_account: Option<String>

Azure storage account name (secondary blobs = azure).

azure_container: Option<String>

Azure container name for the secondary.

azure_access_key: Option<String>

Azure storage account access key (shared-key auth) for the secondary.

azure_emulator: bool

Use the Azurite emulator for the secondary.

secondary_timeout_secs: Option<u64>

Bound (seconds) on each secondary read so a wedged secondary degrades a primary miss to NotFound instead of hanging the serve path. Absent ⇒ DEFAULT_BLOB_FALLBACK_TIMEOUT_SECS.

Trait Implementations

impl Clone for BlobFallbackConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BlobFallbackConfig

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

Formats the value using the given formatter.

impl Default for BlobFallbackConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for BlobFallbackConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.