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Add code documentation

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Signed-off-by: Sylvain Baubeau <sbaubeau@redhat.com>
This commit is contained in:
Sylvain Baubeau 2015-06-30 14:17:12 +02:00
parent f21cbcebc6
commit 33028c11a7
1 changed files with 16 additions and 4 deletions
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20
registry/storage/driver/swift/swift.go
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@ -4,8 +4,18 @@
// This package leverages the ncw/swift client library for interfacing with
// Swift.
//
// Because Swift is a key, value store the Stat call does not support last modification
// time for directories (directories are an abstraction for key, value stores)
// It supports both TempAuth authentication and Keystone authentication
// (up to version 3).
//
// Since Swift has no concept of directories (directories are an abstration),
// empty objects are created with the MIME type application/vnd.swift.directory.
//
// As Swift has a limit on the size of a single uploaded object (by default
// this is 5GB), the driver makes use of the Swift Large Object Support
// (http://docs.openstack.org/developer/swift/overview_large_objects.html).
// Only one container is used for both manifests and data objects. Manifests
// are stored in the 'files' pseudo directory, data objects are stored under
// 'segments'.
package swift
import (
@ -33,8 +43,10 @@ import (
const driverName = "swift"
// defaultChunkSize defines the default size of a segment
const defaultChunkSize = 20 * 1024 * 1024
// minChunkSize defines the minimum size of a segment
const minChunkSize = 1 << 20
const directoryMimeType = "application/directory"
@ -80,8 +92,8 @@ type baseEmbed struct {
base.Base
}
// Driver is a storagedriver.StorageDriver implementation backed by Amazon Swift
// Objects are stored at absolute keys in the provided bucket.
// Driver is a storagedriver.StorageDriver implementation backed by Openstack Swift
// Objects are stored at absolute keys in the provided container.
type Driver struct {
baseEmbed
}