ff95059748
Add new internal upload target for Google Cloud Platform and osbuild-upload-gcp CLI tool which uses the API. Supported features are: - Authenticate with GCP using explicitly provided JSON credentials file or let the authentication be handled automatically by the Google cloud client library. The later is useful e.g. when the worker is running in GCP VM instance, which has associated permissions with it. - Upload an existing image file into existing Storage bucket. - Verify MD5 checksum of the uploaded image file against the local file's checksum. - Import the uploaded image file into Compute Node as an Image. - Delete the uploaded image file after a successful image import. - Delete all cache files from storage created as part of the image import build job. - Share the imported image with a list of specified accounts. GCP-specific image type is not yet added, since GCP supports importing VMDK and VHD images, which the osbuild-composer already supports. Update go.mod, vendor/ content and SPEC file with new dependencies. Signed-off-by: Tomas Hozza <thozza@redhat.com>
133 lines
3 KiB
Go
133 lines
3 KiB
Go
/*
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Copyright 2013 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package lru implements an LRU cache.
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package lru
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import "container/list"
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// Cache is an LRU cache. It is not safe for concurrent access.
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type Cache struct {
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// MaxEntries is the maximum number of cache entries before
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// an item is evicted. Zero means no limit.
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MaxEntries int
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// OnEvicted optionally specifies a callback function to be
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// executed when an entry is purged from the cache.
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OnEvicted func(key Key, value interface{})
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ll *list.List
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cache map[interface{}]*list.Element
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}
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// A Key may be any value that is comparable. See http://golang.org/ref/spec#Comparison_operators
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type Key interface{}
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type entry struct {
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key Key
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value interface{}
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}
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// New creates a new Cache.
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// If maxEntries is zero, the cache has no limit and it's assumed
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// that eviction is done by the caller.
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func New(maxEntries int) *Cache {
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return &Cache{
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MaxEntries: maxEntries,
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ll: list.New(),
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cache: make(map[interface{}]*list.Element),
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}
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}
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// Add adds a value to the cache.
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func (c *Cache) Add(key Key, value interface{}) {
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if c.cache == nil {
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c.cache = make(map[interface{}]*list.Element)
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c.ll = list.New()
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}
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if ee, ok := c.cache[key]; ok {
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c.ll.MoveToFront(ee)
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ee.Value.(*entry).value = value
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return
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}
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ele := c.ll.PushFront(&entry{key, value})
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c.cache[key] = ele
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if c.MaxEntries != 0 && c.ll.Len() > c.MaxEntries {
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c.RemoveOldest()
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}
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}
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// Get looks up a key's value from the cache.
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func (c *Cache) Get(key Key) (value interface{}, ok bool) {
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if c.cache == nil {
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return
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}
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if ele, hit := c.cache[key]; hit {
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c.ll.MoveToFront(ele)
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return ele.Value.(*entry).value, true
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}
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return
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}
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// Remove removes the provided key from the cache.
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func (c *Cache) Remove(key Key) {
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if c.cache == nil {
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return
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}
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if ele, hit := c.cache[key]; hit {
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c.removeElement(ele)
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}
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}
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// RemoveOldest removes the oldest item from the cache.
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func (c *Cache) RemoveOldest() {
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if c.cache == nil {
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return
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}
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ele := c.ll.Back()
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if ele != nil {
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c.removeElement(ele)
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}
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}
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func (c *Cache) removeElement(e *list.Element) {
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c.ll.Remove(e)
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kv := e.Value.(*entry)
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delete(c.cache, kv.key)
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if c.OnEvicted != nil {
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c.OnEvicted(kv.key, kv.value)
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}
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}
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// Len returns the number of items in the cache.
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func (c *Cache) Len() int {
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if c.cache == nil {
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return 0
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}
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return c.ll.Len()
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}
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// Clear purges all stored items from the cache.
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func (c *Cache) Clear() {
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if c.OnEvicted != nil {
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for _, e := range c.cache {
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kv := e.Value.(*entry)
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c.OnEvicted(kv.key, kv.value)
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}
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}
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c.ll = nil
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c.cache = nil
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}
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