From 64822d5cbfe907f717ee6023b54ddd40ae171a8a Mon Sep 17 00:00:00 2001 From: Soule BA Date: Sun, 28 Apr 2024 23:53:53 +0200 Subject: [PATCH] Add a lru cache that implements the store interface Signed-off-by: Soule BA --- cache/cache.go | 72 +++++++----- cache/cache_test.go | 16 ++- cache/errors.go | 9 ++ cache/go.mod | 32 ++++-- cache/go.sum | 189 +++++++++++++++++++++++++++----- cache/lru.go | 84 ++++++++++---- cache/lru_test.go | 259 +++++++++++++++++++++++++++++++++++++++++++- cache/store.go | 39 ++----- 8 files changed, 579 insertions(+), 121 deletions(-) diff --git a/cache/cache.go b/cache/cache.go index 2cee0c8ee..e13a165fa 100644 --- a/cache/cache.go +++ b/cache/cache.go @@ -17,7 +17,6 @@ limitations under the License. package cache import ( - "fmt" "sync" "time" ) @@ -71,11 +70,12 @@ func New[T any](maxItems int, keyFunc KeyFunc[T], interval time.Duration) *Cache return C } +// Close closes the cache. It also stops the expiration eviction process. func (c *Cache[T]) Close() error { c.mu.Lock() defer c.mu.Unlock() if c.closed { - return fmt.Errorf("cache already closed") + return ErrClosed } c.janitor.stop <- true c.closed = true @@ -92,21 +92,23 @@ func (c *Cache[T]) Add(object T) error { } c.mu.Lock() - defer c.mu.Unlock() if c.closed { - return KeyError{object, fmt.Errorf("cache already closed")} + c.mu.Unlock() + return KeyError{object, ErrClosed} } _, found := c.Items[key] if found { - return KeyError{object, fmt.Errorf("key already exists")} + c.mu.Unlock() + return KeyError{object, ErrAlreadyExists} } if c.MaxItems > 0 && len(c.Items) < c.MaxItems { c.set(key, object) + c.mu.Unlock() return nil } - - return KeyError{object, fmt.Errorf("Cache[T] is full")} + c.mu.Unlock() + return KeyError{object, ErrFull} } // Update adds an item to the cache, replacing any existing item. @@ -118,22 +120,24 @@ func (c *Cache[T]) Update(object T) error { } c.mu.Lock() - defer c.mu.Unlock() if c.closed { - return KeyError{object, fmt.Errorf("cache already closed")} + c.mu.Unlock() + return KeyError{object, ErrClosed} } _, found := c.Items[key] if found { c.set(key, object) + c.mu.Unlock() return nil } if c.MaxItems > 0 && len(c.Items) < c.MaxItems { c.set(key, object) + c.mu.Unlock() return nil } - - return KeyError{object, fmt.Errorf("Cache[T] is full")} + c.mu.Unlock() + return KeyError{object, ErrFull} } func (c *cache[T]) set(key string, object T) { @@ -169,19 +173,22 @@ func (c *Cache[T]) GetByKey(key string) (T, bool, error) { func (c *cache[T]) get(key string) (T, bool, error) { var res T c.mu.RLock() - defer c.mu.RUnlock() if c.closed { - return res, false, fmt.Errorf("cache already closed") + c.mu.RUnlock() + return res, false, ErrClosed } item, found := c.Items[key] if !found { + c.mu.RUnlock() return res, false, nil } if item.Expiration > 0 { if item.Expiration < time.Now().UnixNano() { - return res, false, fmt.Errorf("key has expired") + c.mu.RUnlock() + return res, false, ErrExpired } } + c.mu.RUnlock() return item.Object, true, nil } @@ -192,11 +199,12 @@ func (c *Cache[T]) Delete(object T) error { return KeyError{object, err} } c.mu.Lock() - defer c.mu.Unlock() if c.closed { - return KeyError{object, fmt.Errorf("cache already closed")} + c.mu.Unlock() + return KeyError{object, ErrClosed} } delete(c.Items, key) + c.mu.Unlock() return nil } @@ -206,25 +214,27 @@ func (c *Cache[T]) Delete(object T) error { // A closed cache cannot be cleared. func (c *cache[T]) Clear() { c.mu.Lock() - defer c.mu.Unlock() if c.closed { + c.mu.Unlock() return } c.Items = make(map[string]Item[T]) + c.mu.Unlock() } // ListKeys returns a slice of the keys in the cache. // If the cache is closed, ListKeys returns nil. func (c *cache[T]) ListKeys() []string { c.mu.RLock() - defer c.mu.RUnlock() if c.closed { + c.mu.RUnlock() return nil } keys := make([]string, 0, len(c.Items)) for k := range c.Items { keys = append(keys, k) } + c.mu.RUnlock() return keys } @@ -236,19 +246,22 @@ func (c *Cache[T]) HasExpired(object T) (bool, error) { } c.mu.RLock() - defer c.mu.RUnlock() if c.closed { - return false, KeyError{object, fmt.Errorf("cache already closed")} + c.mu.RUnlock() + return false, KeyError{object, ErrClosed} } item, ok := c.Items[key] if !ok { + c.mu.RUnlock() return true, nil } if item.Expiration > 0 { if item.Expiration < time.Now().UnixNano() { + c.mu.RUnlock() return true, nil } } + c.mu.RUnlock() return false, nil } @@ -261,15 +274,16 @@ func (c *Cache[T]) SetExpiration(object T, expiration time.Duration) error { } c.mu.Lock() - defer c.mu.Unlock() if c.closed { - return KeyError{object, fmt.Errorf("cache already closed")} + c.mu.Unlock() + return KeyError{object, ErrClosed} } item, ok := c.Items[key] if ok { item.Expiration = time.Now().Add(expiration).UnixNano() c.Items[key] = item } + c.mu.Unlock() return nil } @@ -282,27 +296,30 @@ func (c *Cache[T]) GetExpiration(object T) (time.Duration, error) { return 0, KeyError{object, err} } c.mu.RLock() - defer c.mu.RUnlock() if c.closed { - return 0, KeyError{object, fmt.Errorf("cache already closed")} + c.mu.RUnlock() + return 0, KeyError{object, ErrClosed} } item, ok := c.Items[key] if !ok { - return 0, KeyError{object, fmt.Errorf("key not found")} + c.mu.RUnlock() + return 0, KeyError{object, ErrNotFound} } if item.Expiration > 0 { if item.Expiration < time.Now().UnixNano() { - return 0, KeyError{object, fmt.Errorf("key has expired")} + c.mu.RUnlock() + return 0, KeyError{object, ErrExpired} } } + c.mu.RUnlock() return time.Duration(item.Expiration - time.Now().UnixNano()), nil } // DeleteExpired deletes all expired items from the cache. func (c *cache[T]) DeleteExpired() { c.mu.Lock() - defer c.mu.Unlock() if c.closed { + c.mu.Unlock() return } for k, v := range c.Items { @@ -310,6 +327,7 @@ func (c *cache[T]) DeleteExpired() { delete(c.Items, k) } } + c.mu.Unlock() } type janitor[T any] struct { diff --git a/cache/cache_test.go b/cache/cache_test.go index 62e6e6c1a..5091d534a 100644 --- a/cache/cache_test.go +++ b/cache/cache_test.go @@ -20,8 +20,10 @@ import ( "testing" "time" + "github.com/fluxcd/cli-utils/pkg/object" . "github.com/onsi/gomega" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/runtime/schema" kc "k8s.io/client-go/tools/cache" ) @@ -114,12 +116,18 @@ func TestCache(t *testing.T) { t.Run("Add expiring keys", func(t *testing.T) { g := NewWithT(t) // new cache with a cleanup interval of 1 second - cache := New[NamespacedNameObject](2, NamespacedNameObjectKeyFunc, 1*time.Second) + cache := New[IdentifiableObject](2, IdentifiableObjectKeyFunc, 1*time.Second) // Add an object representing an expiring token - obj := NamespacedNameObject{ - Namespace: "test-ns", - Name: "test", + obj := IdentifiableObject{ + ObjMetadata: object.ObjMetadata{ + Namespace: "test-ns", + Name: "test", + GroupKind: schema.GroupKind{ + Group: "test-group", + Kind: "TestObject", + }, + }, Object: struct { token string }{ diff --git a/cache/errors.go b/cache/errors.go index 624e89e47..0099a46cd 100644 --- a/cache/errors.go +++ b/cache/errors.go @@ -18,6 +18,15 @@ package cache import "fmt" +var ( + // ErrNotFound is returned when an item is not found in the cache. + ErrNotFound = fmt.Errorf("not found") + ErrAlreadyExists = fmt.Errorf("already exists") + ErrClosed = fmt.Errorf("cache closed") + ErrFull = fmt.Errorf("cache full") + ErrExpired = fmt.Errorf("key has expired") +) + // KeyError will be returned any time a KeyFunc gives an error; it includes the object // at fault. type KeyError struct { diff --git a/cache/go.mod b/cache/go.mod index a2f0b613c..842079a60 100644 --- a/cache/go.mod +++ b/cache/go.mod @@ -3,6 +3,7 @@ module github.com/fluxcd/pkg/cache go 1.22.0 require ( + github.com/fluxcd/cli-utils v0.36.0-flux.7 github.com/onsi/gomega v1.32.0 github.com/prometheus/client_golang v1.19.0 k8s.io/apimachinery v0.30.0 @@ -12,44 +13,55 @@ require ( require ( github.com/beorn7/perks v1.0.1 // indirect + github.com/blang/semver/v4 v4.0.0 // indirect github.com/cespare/xxhash/v2 v2.2.0 // indirect - github.com/davecgh/go-spew v1.1.1 // indirect + github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/go-errors/errors v1.5.1 // indirect github.com/go-logr/logr v1.4.1 // indirect github.com/go-openapi/jsonpointer v0.19.6 // indirect github.com/go-openapi/jsonreference v0.20.2 // indirect - github.com/go-openapi/swag v0.22.3 // indirect + github.com/go-openapi/swag v0.22.4 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.4 // indirect github.com/google/gnostic-models v0.6.8 // indirect github.com/google/go-cmp v0.6.0 // indirect github.com/google/gofuzz v1.2.0 // indirect - github.com/google/uuid v1.3.0 // indirect + github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect + github.com/google/uuid v1.6.0 // indirect github.com/josharian/intern v1.0.0 // indirect github.com/json-iterator/go v1.1.12 // indirect github.com/mailru/easyjson v0.7.7 // indirect github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect github.com/prometheus/client_model v0.5.0 // indirect github.com/prometheus/common v0.48.0 // indirect github.com/prometheus/procfs v0.12.0 // indirect - golang.org/x/net v0.23.0 // indirect - golang.org/x/oauth2 v0.16.0 // indirect - golang.org/x/sys v0.18.0 // indirect - golang.org/x/term v0.18.0 // indirect + github.com/xlab/treeprint v1.2.0 // indirect + go.starlark.net v0.0.0-20230525235612-a134d8f9ddca // indirect + golang.org/x/net v0.24.0 // indirect + golang.org/x/oauth2 v0.19.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.19.0 // indirect + golang.org/x/term v0.19.0 // indirect golang.org/x/text v0.14.0 // indirect - golang.org/x/time v0.3.0 // indirect - google.golang.org/appengine v1.6.7 // indirect + golang.org/x/time v0.5.0 // indirect google.golang.org/protobuf v1.33.0 // indirect + gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect gopkg.in/inf.v0 v0.9.1 // indirect gopkg.in/yaml.v2 v2.4.0 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect k8s.io/api v0.30.0 // indirect + k8s.io/cli-runtime v0.30.0 // indirect k8s.io/klog/v2 v2.120.1 // indirect k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/kustomize/api v0.17.1 // indirect + sigs.k8s.io/kustomize/kyaml v0.17.0 // indirect sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect - sigs.k8s.io/yaml v1.3.0 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect ) diff --git a/cache/go.sum b/cache/go.sum index 5268ad735..62b68a622 100644 --- a/cache/go.sum +++ b/cache/go.sum @@ -1,34 +1,76 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ= +github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE= github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM= +github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod 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v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q= +gopkg.in/evanphx/json-patch.v4 v4.12.0 h1:n6jtcsulIzXPJaxegRbvFNNrZDjbij7ny3gmSPG+6V4= +gopkg.in/evanphx/json-patch.v4 v4.12.0/go.mod h1:p8EYWUEYMpynmqDbY58zCKCFZw8pRWMG4EsWvDvM72M= gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc= gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= @@ -148,23 +265,35 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools 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h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE= k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 h1:BZqlfIlq5YbRMFko6/PM7FjZpUb45WallggurYhKGag= k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340/go.mod h1:yD4MZYeKMBwQKVht279WycxKyM84kkAx2DPrTXaeb98= +k8s.io/kubectl v0.30.0 h1:xbPvzagbJ6RNYVMVuiHArC1grrV5vSmmIcSZuCdzRyk= +k8s.io/kubectl v0.30.0/go.mod h1:zgolRw2MQXLPwmic2l/+iHs239L49fhSeICuMhQQXTI= k8s.io/utils v0.0.0-20230726121419-3b25d923346b h1:sgn3ZU783SCgtaSJjpcVVlRqd6GSnlTLKgpAAttJvpI= k8s.io/utils v0.0.0-20230726121419-3b25d923346b/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0= sigs.k8s.io/controller-runtime v0.18.0 h1:Z7jKuX784TQSUL1TIyeuF7j8KXZ4RtSX0YgtjKcSTME= sigs.k8s.io/controller-runtime v0.18.0/go.mod h1:tuAt1+wbVsXIT8lPtk5RURxqAnq7xkpv2Mhttslg7Hw= sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo= sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0= +sigs.k8s.io/kustomize/api v0.17.1 h1:MYJBOP/yQ3/5tp4/sf6HiiMfNNyO97LmtnirH9SLNr4= +sigs.k8s.io/kustomize/api v0.17.1/go.mod h1:ffn5491s2EiNrJSmgqcWGzQUVhc/pB0OKNI0HsT/0tA= +sigs.k8s.io/kustomize/kyaml v0.17.0 h1:G2bWs03V9Ur2PinHLzTUJ8Ded+30SzXZKiO92SRDs3c= +sigs.k8s.io/kustomize/kyaml v0.17.0/go.mod h1:6lxkYF1Cv9Ic8g/N7I86cvxNc5iinUo/P2vKsHNmpyE= sigs.k8s.io/structured-merge-diff/v4 v4.4.1 h1:150L+0vs/8DA78h1u02ooW1/fFq/Lwr+sGiqlzvrtq4= sigs.k8s.io/structured-merge-diff/v4 v4.4.1/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08= -sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo= -sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/cache/lru.go b/cache/lru.go index 09c1426ed..5830f6f23 100644 --- a/cache/lru.go +++ b/cache/lru.go @@ -16,6 +16,12 @@ limitations under the License. package cache +import ( + "sync" +) + +// Node is a node in a doubly linked list +// that is used to implement an LRU cache type Node[T any] struct { object T key string @@ -31,6 +37,10 @@ func (n *Node[T]) addPrev(node *Node[T]) { n.prev = node } +// LRU is a thread-safe in-memory key/object store. +// All methods are safe for concurrent use. +// All operations are O(1). The hash map lookup is O(1) and so is the doubly +// linked list insertion/deletion. type LRU[T any] struct { cache map[string]*Node[T] capacity int @@ -39,11 +49,13 @@ type LRU[T any] struct { keyFunc KeyFunc[T] head *Node[T] tail *Node[T] + mu sync.RWMutex } var _ Store[any] = &LRU[any]{} -func NewCache[T any](capacity int, keyFunc KeyFunc[T]) *LRU[T] { +// NewLRU creates a new LRU cache with the given capacity and keyFunc. +func NewLRU[T any](capacity int, keyFunc KeyFunc[T]) *LRU[T] { head := &Node[T]{} tail := &Node[T]{} head.addNext(tail) @@ -58,19 +70,29 @@ func NewCache[T any](capacity int, keyFunc KeyFunc[T]) *LRU[T] { } // Add adds a node to the end of the list +// if the node is already in the cache, an error is returned func (c *LRU[T]) Add(object T) error { key, err := c.keyFunc(object) if err != nil { return KeyError{object, err} } - node := &Node[T]{ - key: key, - object: object, + + // if node is already in cache, return error + c.mu.RLock() + _, ok := c.cache[key] + c.mu.RUnlock() + if ok { + return KeyError{object, ErrAlreadyExists} } + + c.mu.Lock() + c.add(&Node[T]{key: key, object: object}) + c.mu.Unlock() + return nil +} + +func (c *LRU[T]) add(node *Node[T]) { prev := c.tail.prev - if c.head.next.key == "" { - c.head.next = node - } prev.addNext(node) c.tail.addPrev(node) node.addPrev(prev) @@ -79,11 +101,11 @@ func (c *LRU[T]) Add(object T) error { c.cache[node.key] = node if len(c.cache) > c.capacity { - c.Delete(c.head.next.object) + c.delete(c.head.next) } - return nil } +// Delete removes a node from the list func (c *LRU[T]) Delete(object T) error { key, err := c.keyFunc(object) if err != nil { @@ -95,20 +117,26 @@ func (c *LRU[T]) Delete(object T) error { return nil } + c.mu.Lock() // if node is not in cache, do nothing node, ok := c.cache[key] if !ok { + c.mu.Unlock() return nil } - prev := node.prev - next := node.next - prev.next = next - next.prev = prev - delete(c.cache, node.key) + c.delete(node) + c.mu.Unlock() return nil } +func (c *LRU[T]) delete(node *Node[T]) { + node.prev.next, node.next.prev = node.next, node.prev + delete(c.cache, node.key) +} + +// Get returns the given object from the cache. +// If the object is not in the cache, it returns false. func (c *LRU[T]) Get(object T) (item T, exists bool, err error) { key, err := c.keyFunc(object) if err != nil { @@ -118,40 +146,52 @@ func (c *LRU[T]) Get(object T) (item T, exists bool, err error) { return c.get(key) } +// GetByKey returns the object for the given key. func (c *LRU[T]) GetByKey(key string) (item T, exists bool, err error) { return c.get(key) } func (c *LRU[T]) get(key string) (item T, exists bool, err error) { var res T + c.mu.Lock() node, ok := c.cache[key] if !ok { + c.mu.Unlock() return res, false, nil } - - err = c.Delete(node.object) - c.Add(node.object) + c.delete(node) + c.add(node) + c.mu.Unlock() return node.object, true, err } +// Update updates an object in the cache. +// If the object is not in the cache, it is added. func (c *LRU[T]) Update(object T) error { key, err := c.keyFunc(object) if err != nil { return KeyError{object, err} } - if node, ok := c.cache[key]; ok { - c.Delete(node.object) + c.mu.Lock() + node, ok := c.cache[key] + if ok { + c.delete(node) + c.add(&Node[T]{key: key, object: object}) + c.mu.Unlock() + return nil } - - c.Add(object) - return nil + c.mu.Unlock() + return c.Add(object) } +// ListKeys returns a list of keys in the cache. func (c *LRU[T]) ListKeys() []string { keys := make([]string, 0, len(c.cache)) + c.mu.RLock() for k := range c.cache { keys = append(keys, k) } + c.mu.RUnlock() return keys } diff --git a/cache/lru_test.go b/cache/lru_test.go index ab15964f7..3e970f450 100644 --- a/cache/lru_test.go +++ b/cache/lru_test.go @@ -19,8 +19,10 @@ package cache import ( "testing" + "github.com/fluxcd/cli-utils/pkg/object" . "github.com/onsi/gomega" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/runtime/schema" kc "k8s.io/client-go/tools/cache" ) @@ -65,17 +67,160 @@ func Test_LRU(t *testing.T) { }, }, }, + { + name: "add seven nodes", + inputs: []*testObject{ + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test2", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test3", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test4", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test5", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test6", + }, + }, + { + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test7", + }, + }, + }, + expectedCache: map[string]*Node[testObject]{ + "test-ns/test3": { + object: testObject{ + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test3", + }, + }, + key: "test-ns/test3", + }, + "test-ns/test4": { + object: testObject{ + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test4", + }, + }, + key: "test-ns/test4", + }, + "test-ns/test5": { + object: testObject{ + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test5", + }, + }, + key: "test-ns/test5", + }, + "test-ns/test6": { + object: testObject{ + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test6", + }, + }, + key: "test-ns/test6", + }, + "test-ns/test7": { + object: testObject{ + TypeMeta: metav1.TypeMeta{ + Kind: "TestObject", + APIVersion: "v1", + }, + ObjectMeta: metav1.ObjectMeta{ + Namespace: "test-ns", + Name: "test7", + }, + }, + key: "test-ns/test7", + }, + }, + }, } for _, v := range testCases { t.Run(v.name, func(t *testing.T) { g := NewWithT(t) - cache := NewCache(5, kc.MetaNamespaceKeyFunc) + cache := NewLRU(5, kc.MetaNamespaceKeyFunc) for _, input := range v.inputs { err := cache.Add(input) g.Expect(err).ToNot(HaveOccurred()) } + g.Expect(cache.cache).To(HaveLen(len(v.expectedCache))) for k, v := range v.expectedCache { if node, ok := cache.cache[k]; !ok { t.Errorf("Expected key %s, got %s", k, node.key) @@ -84,5 +229,117 @@ func Test_LRU(t *testing.T) { } }) } +} + +func Test_LRU_Add(t *testing.T) { + g := NewWithT(t) + cache := NewLRU[IdentifiableObject](1, IdentifiableObjectKeyFunc) + + // Add an object representing an expiring token + obj := IdentifiableObject{ + ObjMetadata: object.ObjMetadata{ + Namespace: "test-ns", + Name: "test", + GroupKind: schema.GroupKind{ + Group: "test-group", + Kind: "TestObject", + }, + }, + Object: "test-token", + } + err := cache.Add(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(cache.ListKeys()).To(ConsistOf("test-ns_test_test-group_TestObject")) + + // try adding the same object again + err = cache.Add(obj) + g.Expect(err).To(HaveOccurred()) + g.Expect(err.Error()).To(ContainSubstring("already exists")) + + obj.Name = "test2" + err = cache.Add(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(cache.ListKeys()).To(ConsistOf("test-ns_test2_test-group_TestObject")) +} + +func Test_LRU_Update(t *testing.T) { + g := NewWithT(t) + cache := NewLRU[IdentifiableObject](1, IdentifiableObjectKeyFunc) + + // Add an object representing an expiring token + obj := IdentifiableObject{ + ObjMetadata: object.ObjMetadata{ + Namespace: "test-ns", + Name: "test", + GroupKind: schema.GroupKind{ + Group: "test-group", + Kind: "TestObject", + }, + }, + Object: "test-token", + } + err := cache.Add(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(cache.ListKeys()).To(ConsistOf("test-ns_test_test-group_TestObject")) + + obj.Object = "test-token2" + err = cache.Update(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(cache.ListKeys()).To(ConsistOf("test-ns_test_test-group_TestObject")) + g.Expect(cache.cache["test-ns_test_test-group_TestObject"].object.Object).To(Equal("test-token2")) +} + +func Test_LRU_Get(t *testing.T) { + g := NewWithT(t) + cache := NewLRU[IdentifiableObject](5, IdentifiableObjectKeyFunc) + + // Add an object representing an expiring token + obj := IdentifiableObject{ + ObjMetadata: object.ObjMetadata{ + Namespace: "test-ns", + Name: "test", + GroupKind: schema.GroupKind{ + Group: "test-group", + Kind: "TestObject", + }, + }, + Object: "test-token", + } + + _, found, err := cache.Get(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(found).To(BeFalse()) + + err = cache.Add(obj) + g.Expect(err).ToNot(HaveOccurred()) + + item, found, err := cache.Get(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(found).To(BeTrue()) + g.Expect(item).To(Equal(obj)) +} + +func Test_LRU_Delete(t *testing.T) { + g := NewWithT(t) + cache := NewLRU[IdentifiableObject](5, IdentifiableObjectKeyFunc) + + // Add an object representing an expiring token + obj := IdentifiableObject{ + ObjMetadata: object.ObjMetadata{ + Namespace: "test-ns", + Name: "test", + GroupKind: schema.GroupKind{ + Group: "test-group", + Kind: "TestObject", + }, + }, + Object: "test-token", + } + + err := cache.Add(obj) + g.Expect(err).ToNot(HaveOccurred()) + err = cache.Delete(obj) + g.Expect(err).ToNot(HaveOccurred()) + g.Expect(cache.ListKeys()).To(BeEmpty()) } diff --git a/cache/store.go b/cache/store.go index 668038e5a..93b4ed95c 100644 --- a/cache/store.go +++ b/cache/store.go @@ -19,6 +19,8 @@ package cache import ( "fmt" "time" + + "github.com/fluxcd/cli-utils/pkg/object" ) // Store is an interface for a cache store. @@ -45,42 +47,25 @@ type Expirable[T any] interface { // KeyFunc knows how to make a key from an object. Implementations should be deterministic. type KeyFunc[T any] func(object T) (string, error) -// NamespacedNameObject is an object that has a namespace and a name. -// It is useful for deriving keys from objects that do not implement meta.Interface. -type NamespacedNameObject struct { - Namespace string - Name string - Object any -} - -// GetNamespace returns the namespace of the object. -func (n NamespacedNameObject) GetNamespace() string { - return n.Namespace +// IdentifiableObject is a wrapper for an object with its identifying metadata. +type IdentifiableObject struct { + object.ObjMetadata + Object any } -// GetName returns the name of the object. -func (n NamespacedNameObject) GetName() string { - return n.Name -} - -// ExplicitKey can be passed to NamespacedNameObjectyFunc if you have the key for +// ExplicitKey can be passed to IdentifiableObjectFunc if you have the key for // the objectect but not the objectect itself. type ExplicitKey string -// NamespacedNameObjectKeyFunc is a convenient default KeyFunc which knows how to make -// keys from NamespacedNameObject objects. -// The key uses the format / unless is empty, then -// it's just . -func NamespacedNameObjectKeyFunc[T any](object T) (string, error) { +// IdentifiableObjectKeyFunc is a convenient default KeyFunc which knows how to make +// keys from IdentifiableObject objects. +func IdentifiableObjectKeyFunc[T any](object T) (string, error) { if key, ok := any(object).(ExplicitKey); ok { return string(key), nil } - n, ok := any(object).(NamespacedNameObject) + n, ok := any(object).(IdentifiableObject) if !ok { return "", fmt.Errorf("object has no meta: %v", object) } - if len(n.GetNamespace()) > 0 { - return n.GetNamespace() + "/" + n.GetName(), nil - } - return n.GetName(), nil + return n.String(), nil }