Crate snapdir_stores 

snapdir stores library.

Storage backends for snapdir snapshots plus the store-routing and external-store shim that implement snapdir’s store dispatch:

• FileStore — the in-process file:// backend.
• S3Store — the native AWS-SDK s3:// backend (ring rustls).
• B2Store — the native AWS-SDK b2:// backend, pointed at Backblaze B2’s S3-compatible endpoint (wraps S3Store with a custom endpoint).
• GcsStore — the native google-cloud-storage gs:// backend (ring rustls; ADC credential chain).
• router — scheme → adapter resolution, including the hardcoded gs://→gcs special case for the Google Cloud Storage adapter.
• shim (ExternalStore) — the emit-command shim that dispatches third-party snapdir-<name>-store binaries via the documented get-manifest-command / get-fetch-files-command / get-push-command contract.
• limits (BackendLimits, for_scheme) — the published per-backend request-rate / bandwidth caps (rate caps only; no retry policy) keyed by storage scheme, used to pace transfers under each provider’s documented limits.
• transfer (TransferConfig, RateLimiter, run_concurrent) — the concurrency + bandwidth-limiting foundation each store carries via a TransferConfig for the (later) concurrent transfer loops.
• retry (RetryPolicy, retry_async, retry_blocking) — a pure, injectable full-jitter exponential-backoff engine (no real clock/sleep of its own; the Jitter source and AsyncSleeper/BlockingSleeper are injected). SDK-agnostic over an Attempt outcome; wiring into the S3/GCS/B2 call sites is a later gate.
• adaptive (AdaptiveGate, AdaptiveController) — pure, injectable adaptive control: a resizable concurrency permit pool (async + blocking) plus a deterministic slow-start/AIMD controller that turns injected op samples + system metrics into a concurrency limit and target byte-rate (wiring into the live transfer loops is a later gate).
• stream (StreamStore) — object/manifest-level, content-addressed, verified read/write primitives (the foundation for store-to-store sync), implemented for FileStore, S3Store, GcsStore, and B2Store.
• sync (sync_snapshot, SyncReport) — streaming store-to-store snapshot copy: walks a source manifest and copies its raw objects source → dest through memory only (no local filesystem staging), parallelized across a rayon pool and throttled by a BlockingRateLimiter; writes the manifest last (all-or-nothing).

Re-exports

pub use adaptive::p95_object_size;

pub use adaptive::AdaptiveController;

pub use adaptive::AdaptiveGate;

pub use adaptive::AdaptivePolicy;

pub use adaptive::ControllerDriver;

pub use adaptive::Decision;

pub use adaptive::OpResult;

pub use adaptive::OpSample;

pub use b2_store::B2Store;

pub use file_store::FileStore;

pub use gcs_store::GcsLocation;

pub use gcs_store::GcsStore;

pub use limits::for_scheme;

pub use limits::BackendLimits;

pub use retry::parse_retry_after;

pub use retry::retry_async;

pub use retry::retry_blocking;

pub use retry::retry_network;

pub use retry::AsyncSleeper;

pub use retry::Attempt;

pub use retry::BlockingSleeper;

pub use retry::DefaultJitter;

pub use retry::FixedJitter;

pub use retry::Jitter;

pub use retry::RetryPolicy;

pub use retry::ThreadSleeper;

pub use retry::TokioSleeper;

pub use router::resolve_adapter;

pub use router::Adapter;

pub use router::RouteError;

pub use s3_store::S3Location;

pub use s3_store::S3Store;

pub use shim::ExternalStore;

pub use stream::StreamStore;

pub use sync::sync_snapshot;

pub use sync::SyncReport;

pub use transfer::classify_error;

pub use transfer::run_adaptive;

pub use transfer::run_concurrent;

pub use transfer::AdaptivePolicy as TransferAdaptivePolicy;

pub use transfer::BlockingRateLimiter;

pub use transfer::RateLimiter;

pub use transfer::TransferConfig;

Modules

adaptive

Adaptive concurrency + throughput control (pure control logic).

b2_store

B2Store: the b2:// storage backend, backed by Backblaze B2’s S3-compatible endpoint via the native AWS SDK.

file_store

FileStore: the file:// storage backend.

gcs_store

GcsStore: the gs:// storage backend, backed by the native google-cloud-storage SDK.

limits

Per-backend rate-limit table (RATE CAPS ONLY).

retry

Reusable retry/backoff engine for the network stores.

router

Store routing: scheme → adapter / binary-name resolution.

s3_store

S3Store: the s3:// storage backend, backed by the native AWS SDK.

shim

External-store emit-command shim.

stream

Object/manifest-level, content-addressed streaming over a Store.

sync

Streaming store-to-store snapshot copy.

transfer

Transfer configuration, rate limiting, and bounded-concurrency driver.