pub enum PackageCacheRequest {
    Get {
        meta_far_blob: BlobInfo,
        gc_protection: GcProtection,
        needed_blobs: ServerEnd<NeededBlobsMarker>,
        dir: ServerEnd<DirectoryMarker>,
        responder: PackageCacheGetResponder,
    },
    GetSubpackage {
        superpackage: BlobId,
        subpackage: PackageUrl,
        dir: ServerEnd<DirectoryMarker>,
        responder: PackageCacheGetSubpackageResponder,
    },
    BasePackageIndex {
        iterator: ServerEnd<PackageIndexIteratorMarker>,
        control_handle: PackageCacheControlHandle,
    },
    CachePackageIndex {
        iterator: ServerEnd<PackageIndexIteratorMarker>,
        control_handle: PackageCacheControlHandle,
    },
    Sync {
        responder: PackageCacheSyncResponder,
    },
}
Expand description

This manages the system package cache.

This is intended to be implemented by the package manager component and used by package resolver components.

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Get

Fields

§meta_far_blob: BlobInfo
§gc_protection: GcProtection
§needed_blobs: ServerEnd<NeededBlobsMarker>
§dir: ServerEnd<DirectoryMarker>

Gets the package directory if it is present on the local system. If it is not, the missing_blobs iterator will provide all the blobs in the package that are missing from the system, and the ability to write those blobs to blobfs. If all the missing blobs are downloaded and written to by the client, the dir directory will be resolved. This method will return successfully when the package has been fully resolved, or return an error if the client closes needed_blobs or dir handle before the package has been resolved.

This method does not guarantee the missing blobs have been persisted. In order to guarantee missing blobs are persisted, clients should call [‘Sync’].

Clients must not make concurrent Get() calls for the same meta_far_blob, even across different PackageCache connections, unless the meta_far_blob is in base or already active in the dynamic index. Violating this may result in Get() errors.

  • request meta_far_blob the blob info for the package’s meta.far.
  • request needed_blobs an iterator over all the blobs in the package that are not present on the system.
  • request dir the channel on which the package directory will be served.
  • error a zx_status value indicating failure. One of the following:
    • ZX_ERR_UNAVAILABLE if the client closed needed_blobs handles before all the missing blobs were downloaded to the system.
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GetSubpackage

Fields

§superpackage: BlobId
§subpackage: PackageUrl
§dir: ServerEnd<DirectoryMarker>

Gets the package directory for a subpackage. The connection to the superpackage’s package directory must still be open when this is called. The returned package will be protected by open package tracking.

  • request superpackage the hash of the superpackage’s meta.far.
  • request subpackage the relative package URL of the subpackage.
  • request dir the channel on which the package directory will be served.
  • error a GetSubpackageError value indicating failure.
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BasePackageIndex

Fields

§iterator: ServerEnd<PackageIndexIteratorMarker>

Retrieves a chunk iterator to the base package index.

  • request iterator a request for the PackageIndexIterator that will return sets of PackageIndexEntry objects until all packages in the base index have been iterated.
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CachePackageIndex

Fields

§iterator: ServerEnd<PackageIndexIteratorMarker>

Retrieves a chunk iterator to the cache package index.

  • request iterator a request for the PackageIndexIterator that will return sets of PackageIndexEntry objects until all packages in the cache index have been iterated.
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Sync

Synchronizes updates to the cached packages to the underlying persistent storage.

  • error a zx_status value indicating failure. One of the following:
    • ZX_ERR_INTERNAL if the sync fails.

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Trait Implementations§

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impl Debug for PackageCacheRequest

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

Formats the value using the given formatter. Read more

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unsafe fn encode( self, _encoder: &mut Encoder<'_>, _offset: usize, _depth: Depth ) -> Result<(), Error>

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