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syncstore_test.go
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syncstore_test.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package store
import (
"context"
"errors"
"fmt"
"sync"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus/testutil"
"github.com/stretchr/testify/require"
"github.com/cilium/cilium/pkg/metrics"
"github.com/cilium/cilium/pkg/option"
)
// Configure a generous timeout to prevent flakes when running in a noisy CI environment.
var (
tick = 10 * time.Millisecond
timeout = 5 * time.Second
)
type KVPair struct{ Key, Value string }
func NewKVPair(key, value string) *KVPair { return &KVPair{Key: key, Value: value} }
func (kv *KVPair) GetKeyName() string { return kv.Key }
func (kv *KVPair) Marshal() ([]byte, error) { return []byte(kv.Value), nil }
func (kv *KVPair) Unmarshal(data []byte) error { return nil /* not used */ }
type fakeBackend struct {
t *testing.T
expectLease bool
updated chan *KVPair
deleted chan *KVPair
errorsOnUpdate map[string]uint
errorsOnDelete map[string]uint
}
func NewFakeBackend(t *testing.T, expectLease bool) *fakeBackend {
return &fakeBackend{
t: t,
expectLease: expectLease,
updated: make(chan *KVPair),
deleted: make(chan *KVPair),
errorsOnUpdate: make(map[string]uint),
errorsOnDelete: make(map[string]uint),
}
}
func (fb *fakeBackend) Update(ctx context.Context, key string, value []byte, lease bool) error {
if lease != fb.expectLease {
key = "error"
value = []byte(fmt.Sprintf("incorrect lease setting, expected(%v) - found(%v)", fb.expectLease, lease))
}
select {
case fb.updated <- NewKVPair(key, string(value)):
case <-ctx.Done():
require.Failf(fb.t, "Context closed before writing to updated channel", "key: %s, value: %s", key, value)
}
if cnt := fb.errorsOnUpdate[key]; cnt > 0 {
fb.errorsOnUpdate[key]--
return errors.New("failing on purpose")
}
return nil
}
func (fb *fakeBackend) Delete(ctx context.Context, key string) error {
select {
case fb.deleted <- NewKVPair(key, ""):
case <-ctx.Done():
require.Failf(fb.t, "Context closed before writing to deleted channel", "key: %s", key)
}
if cnt := fb.errorsOnDelete[key]; cnt > 0 {
fb.errorsOnDelete[key]--
return errors.New("failing on purpose")
}
return nil
}
type fakeRateLimiter struct{ whenCalled, forgetCalled chan *KVPair }
func NewFakeRateLimiter() *fakeRateLimiter {
return &fakeRateLimiter{whenCalled: make(chan *KVPair), forgetCalled: make(chan *KVPair)}
}
func (frl *fakeRateLimiter) When(item interface{}) time.Duration {
frl.whenCalled <- NewKVPair(item.(string), "")
return time.Duration(0)
}
func (frl *fakeRateLimiter) Forget(item interface{}) {
frl.forgetCalled <- NewKVPair(item.(string), "")
}
func (frl *fakeRateLimiter) NumRequeues(item interface{}) int { return 0 }
func eventually(in <-chan *KVPair) *KVPair {
select {
case kv := <-in:
return kv
case <-time.After(timeout):
return NewKVPair("error", "timed out waiting for KV")
}
}
func TestWorkqueueSyncStore(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, true)
store := NewWorkqueueSyncStore(backend, "/foo/bar")
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
}()
// Upserts should trigger the corresponding backend operation.
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
require.Equal(t, NewKVPair("/foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("/foo/bar/key2", "value2"), eventually(backend.updated))
// Unless the pair is already part of the known state.
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key3", "value3"))
require.Equal(t, NewKVPair("/foo/bar/key3", "value3"), eventually(backend.updated))
// Upserts for the same key should be coalescenced. In this case, it is guaranteed
// to happen since the first upsert blocks until we read from the channel.
store.UpsertKey(ctx, NewKVPair("key4", "value4"))
store.UpsertKey(ctx, NewKVPair("key1", "valueA"))
store.UpsertKey(ctx, NewKVPair("key1", "valueB"))
require.Equal(t, NewKVPair("/foo/bar/key4", "value4"), eventually(backend.updated))
require.Equal(t, NewKVPair("/foo/bar/key1", "valueB"), eventually(backend.updated))
// Deletions should trigger the corresponding backend operation, only if known to exist.
store.DeleteKey(ctx, NewKVPair("key5", ""))
store.DeleteKey(ctx, NewKVPair("key4", ""))
require.Equal(t, NewKVPair("/foo/bar/key4", ""), eventually(backend.deleted))
// Both upserts and deletes should be retried in case an error is returned by the client
backend.errorsOnUpdate["/foo/bar/key1"] = 1
store.UpsertKey(ctx, NewKVPair("key1", "valueC"))
require.Equal(t, NewKVPair("/foo/bar/key1", "valueC"), eventually(backend.updated))
require.Equal(t, NewKVPair("/foo/bar/key1", "valueC"), eventually(backend.updated))
backend.errorsOnDelete["/foo/bar/key2"] = 1
store.DeleteKey(ctx, NewKVPair("key2", ""))
require.Equal(t, NewKVPair("/foo/bar/key2", ""), eventually(backend.deleted))
require.Equal(t, NewKVPair("/foo/bar/key2", ""), eventually(backend.deleted))
}
func TestWorkqueueSyncStoreWithoutLease(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, false)
store := NewWorkqueueSyncStore(backend, "/foo/bar", WSSWithoutLease())
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
}()
// The fake backend checks whether the lease setting corresponds to the expected
// value, and emits a KVPair with the error message in case it does not match
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
require.Equal(t, NewKVPair("/foo/bar/key1", "value1"), eventually(backend.updated))
}
func TestWorkqueueSyncStoreWithRateLimiter(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, true)
limiter := NewFakeRateLimiter()
store := NewWorkqueueSyncStore(backend, "/foo/bar", WSSWithRateLimiter(limiter))
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
}()
backend.errorsOnUpdate["/foo/bar/key1"] = 1
// Assert that the custom rate limiter has been correctly called
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
require.Equal(t, NewKVPair("/foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("key1", ""), eventually(limiter.whenCalled))
require.Equal(t, NewKVPair("/foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("key1", ""), eventually(limiter.forgetCalled))
}
func TestWorkqueueSyncStoreWithWorkers(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, true)
store := NewWorkqueueSyncStore(backend, "/foo/bar", WSSWithWorkers(2))
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
}()
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
require.Equal(t, NewKVPair("/foo/bar/key1", "value1"), eventually(backend.updated))
// Since the Update() and Delete() functions implemented by the fake backend
// block until we read from the correposponding channel, reading in reversed
// order the elements from the two channels requires at least two workers
store.DeleteKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
require.Equal(t, NewKVPair("/foo/bar/key2", "value2"), eventually(backend.updated))
require.Equal(t, NewKVPair("/foo/bar/key1", ""), eventually(backend.deleted))
}
func TestWorkqueueSyncStoreSynced(t *testing.T) {
runnable := func(body func(*testing.T, context.Context, *fakeBackend, SyncStore), opts ...WSSOpt) func(t *testing.T) {
return func(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, true)
store := NewWorkqueueSyncStore(backend, "foo/bar", opts...)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
}()
body(t, ctx, backend, store)
}
}
t.Run("standard", runnable(func(t *testing.T, ctx context.Context, backend *fakeBackend, store SyncStore) {
callback := func(ctx context.Context) {
backend.Update(ctx, "callback/executed", []byte{}, true)
}
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
store.Synced(ctx, callback, callback)
store.UpsertKey(ctx, NewKVPair("key3", "value3"))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key2", "value2"), eventually(backend.updated))
require.Equal(t, "cilium/synced/qux/foo/bar", eventually(backend.updated).Key)
require.Equal(t, NewKVPair("callback/executed", ""), eventually(backend.updated))
require.Equal(t, NewKVPair("callback/executed", ""), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key3", "value3"), eventually(backend.updated))
}, WSSWithSourceClusterName("qux")))
t.Run("key-override", runnable(func(t *testing.T, ctx context.Context, backend *fakeBackend, store SyncStore) {
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
store.Synced(ctx)
store.UpsertKey(ctx, NewKVPair("key3", "value3"))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key2", "value2"), eventually(backend.updated))
require.Equal(t, "cilium/synced/qux/override", eventually(backend.updated).Key)
require.Equal(t, NewKVPair("foo/bar/key3", "value3"), eventually(backend.updated))
}, WSSWithSourceClusterName("qux"), WSSWithSyncedKeyOverride("override")))
t.Run("key-upsertion-failure", runnable(func(t *testing.T, ctx context.Context, backend *fakeBackend, store SyncStore) {
backend.errorsOnUpdate["foo/bar/key1"] = 1
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
store.Synced(ctx)
store.UpsertKey(ctx, NewKVPair("key3", "value3"))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key2", "value2"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key3", "value3"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
// The synced key shall be created only once key1 has been successfully upserted.
require.Equal(t, "cilium/synced/qux/foo/bar", eventually(backend.updated).Key)
}, WSSWithSourceClusterName("qux")))
t.Run("synced-upsertion-failure", runnable(func(t *testing.T, ctx context.Context, backend *fakeBackend, store SyncStore) {
backend.errorsOnUpdate["cilium/synced/qux/foo/bar"] = 1
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
store.Synced(ctx)
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key2", "value2"), eventually(backend.updated))
require.Equal(t, "cilium/synced/qux/foo/bar", eventually(backend.updated).Key)
require.Equal(t, "cilium/synced/qux/foo/bar", eventually(backend.updated).Key)
}, WSSWithSourceClusterName("qux")))
// Assert that the synced key is created only after key1 has been successfully upserted also in case there are multiple workers
t.Run("multiple-workers", runnable(func(t *testing.T, ctx context.Context, backend *fakeBackend, store SyncStore) {
backend.errorsOnUpdate["foo/bar/key1"] = 2
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.Synced(ctx)
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, NewKVPair("foo/bar/key1", "value1"), eventually(backend.updated))
require.Equal(t, "cilium/synced/qux/foo/bar", eventually(backend.updated).Key)
}, WSSWithSourceClusterName("qux"), WSSWithWorkers(10)))
}
func TestWorkqueueSyncStoreMetrics(t *testing.T) {
defer func(name string, queue, sync metrics.GaugeVec) {
option.Config.ClusterName = name
metrics.KVStoreSyncQueueSize = queue
metrics.KVStoreInitialSyncCompleted = sync
}(option.Config.ClusterName, metrics.KVStoreSyncQueueSize, metrics.KVStoreInitialSyncCompleted)
option.Config.ClusterName = "foo"
cfg, collectors := metrics.CreateConfiguration([]string{"cilium_kvstore_sync_queue_size", "cilium_kvstore_initial_sync_completed"})
require.True(t, cfg.KVStoreSyncQueueSizeEnabled)
require.True(t, cfg.KVStoreInitialSyncCompletedEnabled)
require.Len(t, collectors, 2)
ctx, cancel := context.WithCancel(context.Background())
backend := NewFakeBackend(t, true)
store := NewWorkqueueSyncStore(backend, "cilium/state/nodes/v1")
// The queue size should be initially zero.
require.Equal(t, float64(0), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
// We are not reading from the store, hence the queue size should reflect the number of upsertions
store.UpsertKey(ctx, NewKVPair("key1", "value1"))
store.UpsertKey(ctx, NewKVPair("key2", "value2"))
require.Equal(t, float64(2), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
// Upserting a different key shall increse the metric
store.UpsertKey(ctx, NewKVPair("key3", "value3"))
require.Equal(t, float64(3), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
// Upserting an already upserted key (although with a different value) shall not increase the metric
store.UpsertKey(ctx, NewKVPair("key1", "valueA"))
require.Equal(t, float64(3), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
// Start the store
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
store.Run(ctx)
}()
defer func() {
cancel()
wg.Wait()
// The store should no longer be synced, since it is stopped.
require.Equal(t, metrics.BoolToFloat64(false),
testutil.ToFloat64(metrics.KVStoreInitialSyncCompleted.WithLabelValues("nodes/v1", "foo", "write")))
}()
// The metric should reflect the updated queue size (one in this case, since one element has been processed, and
// another is being processed --- stuck performing Update()). We need to assert this "eventually", because we have
// no guarantee that the processing of the second element has already started.
require.Equal(t, NewKVPair("cilium/state/nodes/v1/key1", "valueA"), eventually(backend.updated))
require.Eventually(t, func() bool {
return testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")) == 1
}, timeout, tick, "Incorrect metric value (expected: 1)")
// Deleting one element, the queue size should grow by one (the worker is still stuck in the Update() call).
store.DeleteKey(ctx, NewKVPair("key1", ""))
require.Equal(t, float64(2), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
backend.errorsOnUpdate["cilium/state/nodes/v1/key3"] = 1
require.Equal(t, NewKVPair("cilium/state/nodes/v1/key2", "value2"), eventually(backend.updated))
require.Equal(t, NewKVPair("cilium/state/nodes/v1/key3", "value3"), eventually(backend.updated))
require.Equal(t, NewKVPair("cilium/state/nodes/v1/key1", ""), eventually(backend.deleted))
require.Equal(t, NewKVPair("cilium/state/nodes/v1/key3", "value3"), eventually(backend.updated))
store.Synced(ctx, func(ctx context.Context) {
// When the callback is executed, the store should be synced
require.Equal(t, metrics.BoolToFloat64(true),
testutil.ToFloat64(metrics.KVStoreInitialSyncCompleted.WithLabelValues("nodes/v1", "foo", "write")))
})
// The store should not yet be synced, as the synced entry has not yet been written to the kvstore.
require.Equal(t, metrics.BoolToFloat64(false),
testutil.ToFloat64(metrics.KVStoreInitialSyncCompleted.WithLabelValues("nodes/v1", "foo", "write")))
require.Equal(t, "cilium/synced/foo/cilium/state/nodes/v1", eventually(backend.updated).Key)
// Once all elements have been processed, the metric should be zero.
require.Equal(t, float64(0), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "foo")))
// The metric should reflect the specified cluster name if overwritten.
storeWithClusterName := NewWorkqueueSyncStore(backend, "cilium/state/nodes/v1", WSSWithSourceClusterName("bar"))
storeWithClusterName.UpsertKey(ctx, NewKVPair("key2", "value2"))
require.Equal(t, float64(1), testutil.ToFloat64(metrics.KVStoreSyncQueueSize.WithLabelValues("nodes/v1", "bar")))
}