1094 lines
31 KiB
Go
1094 lines
31 KiB
Go
package cache
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import (
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"errors"
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"fmt"
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"sort"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/mock"
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"github.com/stretchr/testify/require"
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)
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// Test a basic Get with no indexes (and therefore no blocking queries).
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func TestCacheGet_noIndex(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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typ.Static(FetchResult{Value: 42}, nil).Times(1)
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// Get, should fetch
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req := TestRequest(t, RequestInfo{Key: "hello"})
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result, meta, err := c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.False(meta.Hit)
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// Get, should not fetch since we already have a satisfying value
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result, meta, err = c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.True(meta.Hit)
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// Sleep a tiny bit just to let maybe some background calls happen
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// then verify that we still only got the one call
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time.Sleep(20 * time.Millisecond)
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typ.AssertExpectations(t)
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}
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// Test a basic Get with no index and a failed fetch.
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func TestCacheGet_initError(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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fetcherr := fmt.Errorf("error")
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typ.Static(FetchResult{}, fetcherr).Times(2)
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// Get, should fetch
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req := TestRequest(t, RequestInfo{Key: "hello"})
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result, meta, err := c.Get("t", req)
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require.Error(err)
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require.Nil(result)
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require.False(meta.Hit)
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// Get, should fetch again since our last fetch was an error
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result, meta, err = c.Get("t", req)
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require.Error(err)
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require.Nil(result)
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require.False(meta.Hit)
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// Sleep a tiny bit just to let maybe some background calls happen
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// then verify that we still only got the one call
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time.Sleep(20 * time.Millisecond)
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typ.AssertExpectations(t)
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}
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// Test a Get with a request that returns a blank cache key. This should
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// force a backend request and skip the cache entirely.
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func TestCacheGet_blankCacheKey(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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typ.Static(FetchResult{Value: 42}, nil).Times(2)
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// Get, should fetch
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req := TestRequest(t, RequestInfo{Key: ""})
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result, meta, err := c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.False(meta.Hit)
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// Get, should not fetch since we already have a satisfying value
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result, meta, err = c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.False(meta.Hit)
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// Sleep a tiny bit just to let maybe some background calls happen
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// then verify that we still only got the one call
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time.Sleep(20 * time.Millisecond)
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typ.AssertExpectations(t)
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}
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// Test that Get blocks on the initial value
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func TestCacheGet_blockingInitSameKey(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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triggerCh := make(chan time.Time)
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typ.Static(FetchResult{Value: 42}, nil).WaitUntil(triggerCh).Times(1)
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// Perform multiple gets
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getCh1 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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getCh2 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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// They should block
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select {
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case <-getCh1:
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t.Fatal("should block (ch1)")
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case <-getCh2:
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t.Fatal("should block (ch2)")
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case <-time.After(50 * time.Millisecond):
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}
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// Trigger it
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close(triggerCh)
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// Should return
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TestCacheGetChResult(t, getCh1, 42)
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TestCacheGetChResult(t, getCh2, 42)
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}
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// Test that Get with different cache keys both block on initial value
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// but that the fetches were both properly called.
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func TestCacheGet_blockingInitDiffKeys(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Keep track of the keys
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var keysLock sync.Mutex
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var keys []string
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// Configure the type
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triggerCh := make(chan time.Time)
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typ.Static(FetchResult{Value: 42}, nil).
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WaitUntil(triggerCh).
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Times(2).
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Run(func(args mock.Arguments) {
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keysLock.Lock()
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defer keysLock.Unlock()
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keys = append(keys, args.Get(1).(Request).CacheInfo().Key)
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})
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// Perform multiple gets
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getCh1 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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getCh2 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "goodbye"}))
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// They should block
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select {
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case <-getCh1:
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t.Fatal("should block (ch1)")
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case <-getCh2:
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t.Fatal("should block (ch2)")
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case <-time.After(50 * time.Millisecond):
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}
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// Trigger it
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close(triggerCh)
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// Should return both!
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TestCacheGetChResult(t, getCh1, 42)
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TestCacheGetChResult(t, getCh2, 42)
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// Verify proper keys
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sort.Strings(keys)
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require.Equal([]string{"goodbye", "hello"}, keys)
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}
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// Test a get with an index set will wait until an index that is higher
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// is set in the cache.
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func TestCacheGet_blockingIndex(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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triggerCh := make(chan time.Time)
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
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typ.Static(FetchResult{Value: 12, Index: 5}, nil).Once()
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typ.Static(FetchResult{Value: 42, Index: 6}, nil).WaitUntil(triggerCh)
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// Fetch should block
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
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Key: "hello", MinIndex: 5}))
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// Should block
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select {
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case <-resultCh:
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t.Fatal("should block")
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case <-time.After(50 * time.Millisecond):
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}
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// Wait a bit
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close(triggerCh)
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// Should return
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TestCacheGetChResult(t, resultCh, 42)
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}
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// Test a get with an index set will timeout if the fetch doesn't return
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// anything.
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func TestCacheGet_blockingIndexTimeout(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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triggerCh := make(chan time.Time)
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
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typ.Static(FetchResult{Value: 12, Index: 5}, nil).Once()
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typ.Static(FetchResult{Value: 42, Index: 6}, nil).WaitUntil(triggerCh)
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// Fetch should block
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
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Key: "hello", MinIndex: 5, Timeout: 200 * time.Millisecond}))
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// Should block
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select {
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case <-resultCh:
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t.Fatal("should block")
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case <-time.After(50 * time.Millisecond):
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}
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// Should return after more of the timeout
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select {
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case result := <-resultCh:
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require.Equal(t, 12, result)
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case <-time.After(300 * time.Millisecond):
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t.Fatal("should've returned")
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}
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}
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// Test a get with an index set with requests returning an error
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// will return that error.
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func TestCacheGet_blockingIndexError(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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var retries uint32
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fetchErr := fmt.Errorf("test fetch error")
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
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typ.Static(FetchResult{Value: nil, Index: 5}, fetchErr).Run(func(args mock.Arguments) {
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atomic.AddUint32(&retries, 1)
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})
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// First good fetch to populate catch
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Fetch should not block and should return error
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
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Key: "hello", MinIndex: 7, Timeout: 1 * time.Minute}))
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TestCacheGetChResult(t, resultCh, nil)
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// Wait a bit
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time.Sleep(100 * time.Millisecond)
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// Check the number
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actual := atomic.LoadUint32(&retries)
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require.True(t, actual < 10, fmt.Sprintf("actual: %d", actual))
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}
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// Test that if a Type returns an empty value on Fetch that the previous
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// value is preserved.
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func TestCacheGet_emptyFetchResult(t *testing.T) {
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t.Parallel()
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require := require.New(t)
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, nil)
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// Configure the type
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typ.Static(FetchResult{Value: 42, Index: 1}, nil).Times(1)
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typ.Static(FetchResult{Value: nil}, nil)
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// Get, should fetch
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req := TestRequest(t, RequestInfo{Key: "hello"})
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result, meta, err := c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.False(meta.Hit)
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// Get, should not fetch since we already have a satisfying value
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req = TestRequest(t, RequestInfo{
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Key: "hello", MinIndex: 1, Timeout: 100 * time.Millisecond})
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result, meta, err = c.Get("t", req)
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require.NoError(err)
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require.Equal(42, result)
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require.False(meta.Hit)
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// Sleep a tiny bit just to let maybe some background calls happen
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// then verify that we still only got the one call
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time.Sleep(20 * time.Millisecond)
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typ.AssertExpectations(t)
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}
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// Test that a type registered with a periodic refresh will perform
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// that refresh after the timer is up.
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func TestCacheGet_periodicRefresh(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, &RegisterOptions{
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Refresh: true,
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RefreshTimer: 100 * time.Millisecond,
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RefreshTimeout: 5 * time.Minute,
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})
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// This is a bit weird, but we do this to ensure that the final
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// call to the Fetch (if it happens, depends on timing) just blocks.
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triggerCh := make(chan time.Time)
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defer close(triggerCh)
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// Configure the type
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
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typ.Static(FetchResult{Value: 12, Index: 5}, nil).Once()
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typ.Static(FetchResult{Value: 12, Index: 5}, nil).WaitUntil(triggerCh)
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// Fetch should block
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Fetch again almost immediately should return old result
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time.Sleep(5 * time.Millisecond)
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Wait for the timer
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time.Sleep(200 * time.Millisecond)
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 12)
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}
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// Test that a type registered with a periodic refresh will perform
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// that refresh after the timer is up.
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func TestCacheGet_periodicRefreshMultiple(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, &RegisterOptions{
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Refresh: true,
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RefreshTimer: 0 * time.Millisecond,
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RefreshTimeout: 5 * time.Minute,
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})
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// This is a bit weird, but we do this to ensure that the final
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// call to the Fetch (if it happens, depends on timing) just blocks.
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trigger := make([]chan time.Time, 3)
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for i := range trigger {
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trigger[i] = make(chan time.Time)
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}
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// Configure the type
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
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typ.Static(FetchResult{Value: 12, Index: 5}, nil).Once().WaitUntil(trigger[0])
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typ.Static(FetchResult{Value: 24, Index: 6}, nil).Once().WaitUntil(trigger[1])
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typ.Static(FetchResult{Value: 42, Index: 7}, nil).WaitUntil(trigger[2])
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// Fetch should block
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Fetch again almost immediately should return old result
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time.Sleep(5 * time.Millisecond)
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Trigger the next, sleep a bit, and verify we get the next result
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close(trigger[0])
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time.Sleep(100 * time.Millisecond)
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 12)
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// Trigger the next, sleep a bit, and verify we get the next result
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close(trigger[1])
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time.Sleep(100 * time.Millisecond)
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 24)
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}
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|
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// Test that a refresh performs a backoff.
|
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func TestCacheGet_periodicRefreshErrorBackoff(t *testing.T) {
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t.Parallel()
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typ := TestType(t)
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defer typ.AssertExpectations(t)
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c := TestCache(t)
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c.RegisterType("t", typ, &RegisterOptions{
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Refresh: true,
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RefreshTimer: 0,
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RefreshTimeout: 5 * time.Minute,
|
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})
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|
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// Configure the type
|
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var retries uint32
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fetchErr := fmt.Errorf("test fetch error")
|
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typ.Static(FetchResult{Value: 1, Index: 4}, nil).Once()
|
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typ.Static(FetchResult{Value: nil, Index: 5}, fetchErr).Run(func(args mock.Arguments) {
|
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atomic.AddUint32(&retries, 1)
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})
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|
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// Fetch
|
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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|
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// Sleep a bit. The refresh will quietly fail in the background. What we
|
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// want to verify is that it doesn't retry too much. "Too much" is hard
|
|
// to measure since its CPU dependent if this test is failing. But due
|
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// to the short sleep below, we can calculate about what we'd expect if
|
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// backoff IS working.
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time.Sleep(500 * time.Millisecond)
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// Fetch should work, we should get a 1 still. Errors are ignored.
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
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TestCacheGetChResult(t, resultCh, 1)
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// Check the number
|
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actual := atomic.LoadUint32(&retries)
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require.True(t, actual < 10, fmt.Sprintf("actual: %d", actual))
|
|
}
|
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|
|
// Test that a badly behaved RPC that returns 0 index will perform a backoff.
|
|
func TestCacheGet_periodicRefreshBadRPCZeroIndexErrorBackoff(t *testing.T) {
|
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t.Parallel()
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|
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typ := TestType(t)
|
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defer typ.AssertExpectations(t)
|
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c := TestCache(t)
|
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c.RegisterType("t", typ, &RegisterOptions{
|
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Refresh: true,
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RefreshTimer: 0,
|
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RefreshTimeout: 5 * time.Minute,
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})
|
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|
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// Configure the type
|
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var retries uint32
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typ.Static(FetchResult{Value: 0, Index: 0}, nil).Run(func(args mock.Arguments) {
|
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atomic.AddUint32(&retries, 1)
|
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})
|
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|
|
// Fetch
|
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resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
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TestCacheGetChResult(t, resultCh, 0)
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|
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// Sleep a bit. The refresh will quietly fail in the background. What we
|
|
// want to verify is that it doesn't retry too much. "Too much" is hard
|
|
// to measure since its CPU dependent if this test is failing. But due
|
|
// to the short sleep below, we can calculate about what we'd expect if
|
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// backoff IS working.
|
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time.Sleep(500 * time.Millisecond)
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|
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// Fetch should work, we should get a 0 still. Errors are ignored.
|
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resultCh = TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
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TestCacheGetChResult(t, resultCh, 0)
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|
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// Check the number
|
|
actual := atomic.LoadUint32(&retries)
|
|
require.True(t, actual < 10, fmt.Sprintf("%d retries, should be < 10", actual))
|
|
}
|
|
|
|
// Test that fetching with no index makes an initial request with no index, but
|
|
// then ensures all background refreshes have > 0. This ensures we don't end up
|
|
// with any index 0 loops from background refreshed while also returning
|
|
// immediately on the initial request if there is no data written to that table
|
|
// yet.
|
|
func TestCacheGet_noIndexSetsOne(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
Refresh: true,
|
|
RefreshTimer: 0,
|
|
RefreshTimeout: 5 * time.Minute,
|
|
})
|
|
|
|
// Simulate "well behaved" RPC with no data yet but returning 1
|
|
{
|
|
first := int32(1)
|
|
|
|
typ.Static(FetchResult{Value: 0, Index: 1}, nil).Run(func(args mock.Arguments) {
|
|
opts := args.Get(0).(FetchOptions)
|
|
isFirst := atomic.SwapInt32(&first, 0)
|
|
if isFirst == 1 {
|
|
assert.Equal(t, uint64(0), opts.MinIndex)
|
|
} else {
|
|
assert.True(t, opts.MinIndex > 0, "minIndex > 0")
|
|
}
|
|
})
|
|
|
|
// Fetch
|
|
resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
TestCacheGetChResult(t, resultCh, 0)
|
|
|
|
// Sleep a bit so background refresh happens
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
|
|
// Same for "badly behaved" RPC that returns 0 index and no data
|
|
{
|
|
first := int32(1)
|
|
|
|
typ.Static(FetchResult{Value: 0, Index: 0}, nil).Run(func(args mock.Arguments) {
|
|
opts := args.Get(0).(FetchOptions)
|
|
isFirst := atomic.SwapInt32(&first, 0)
|
|
if isFirst == 1 {
|
|
assert.Equal(t, uint64(0), opts.MinIndex)
|
|
} else {
|
|
assert.True(t, opts.MinIndex > 0, "minIndex > 0")
|
|
}
|
|
})
|
|
|
|
// Fetch
|
|
resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
TestCacheGetChResult(t, resultCh, 0)
|
|
|
|
// Sleep a bit so background refresh happens
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
}
|
|
|
|
// Test that the backend fetch sets the proper timeout.
|
|
func TestCacheGet_fetchTimeout(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
|
|
// Register the type with a timeout
|
|
timeout := 10 * time.Minute
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
RefreshTimeout: timeout,
|
|
})
|
|
|
|
// Configure the type
|
|
var actual time.Duration
|
|
typ.Static(FetchResult{Value: 42}, nil).Times(1).Run(func(args mock.Arguments) {
|
|
opts := args.Get(0).(FetchOptions)
|
|
actual = opts.Timeout
|
|
})
|
|
|
|
// Get, should fetch
|
|
req := TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err := c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Test the timeout
|
|
require.Equal(timeout, actual)
|
|
}
|
|
|
|
// Test that entries expire
|
|
func TestCacheGet_expire(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
|
|
// Register the type with a timeout
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
LastGetTTL: 400 * time.Millisecond,
|
|
})
|
|
|
|
// Configure the type
|
|
typ.Static(FetchResult{Value: 42}, nil).Times(2)
|
|
|
|
// Get, should fetch
|
|
req := TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err := c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Wait for a non-trivial amount of time to sanity check the age increases at
|
|
// least this amount. Note that this is not a fudge for some timing-dependent
|
|
// background work it's just ensuring a non-trivial time elapses between the
|
|
// request above and below serilaly in this thread so short time is OK.
|
|
time.Sleep(5 * time.Millisecond)
|
|
|
|
// Get, should not fetch, verified via the mock assertions above
|
|
req = TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.True(meta.Hit)
|
|
require.True(meta.Age > 5*time.Millisecond)
|
|
|
|
// Sleep for the expiry
|
|
time.Sleep(500 * time.Millisecond)
|
|
|
|
// Get, should fetch
|
|
req = TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Sleep a tiny bit just to let maybe some background calls happen
|
|
// then verify that we still only got the one call
|
|
time.Sleep(20 * time.Millisecond)
|
|
typ.AssertExpectations(t)
|
|
}
|
|
|
|
// Test that entries reset their TTL on Get
|
|
func TestCacheGet_expireResetGet(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
|
|
// Register the type with a timeout
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
LastGetTTL: 150 * time.Millisecond,
|
|
})
|
|
|
|
// Configure the type
|
|
typ.Static(FetchResult{Value: 42}, nil).Times(2)
|
|
|
|
// Get, should fetch
|
|
req := TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err := c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Fetch multiple times, where the total time is well beyond
|
|
// the TTL. We should not trigger any fetches during this time.
|
|
for i := 0; i < 5; i++ {
|
|
// Sleep a bit
|
|
time.Sleep(50 * time.Millisecond)
|
|
|
|
// Get, should not fetch
|
|
req = TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.True(meta.Hit)
|
|
}
|
|
|
|
time.Sleep(200 * time.Millisecond)
|
|
|
|
// Get, should fetch
|
|
req = TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Sleep a tiny bit just to let maybe some background calls happen
|
|
// then verify that we still only got the one call
|
|
time.Sleep(20 * time.Millisecond)
|
|
typ.AssertExpectations(t)
|
|
}
|
|
|
|
// Test a Get with a request that returns the same cache key across
|
|
// two different "types" returns two separate results.
|
|
func TestCacheGet_duplicateKeyDifferentType(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
typ2 := TestType(t)
|
|
defer typ2.AssertExpectations(t)
|
|
|
|
c := TestCache(t)
|
|
c.RegisterType("t", typ, nil)
|
|
c.RegisterType("t2", typ2, nil)
|
|
|
|
// Configure the types
|
|
typ.Static(FetchResult{Value: 100}, nil)
|
|
typ2.Static(FetchResult{Value: 200}, nil)
|
|
|
|
// Get, should fetch
|
|
req := TestRequest(t, RequestInfo{Key: "foo"})
|
|
result, meta, err := c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(100, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Get from t2 with same key, should fetch
|
|
req = TestRequest(t, RequestInfo{Key: "foo"})
|
|
result, meta, err = c.Get("t2", req)
|
|
require.NoError(err)
|
|
require.Equal(200, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Get from t again with same key, should cache
|
|
req = TestRequest(t, RequestInfo{Key: "foo"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(100, result)
|
|
require.True(meta.Hit)
|
|
|
|
// Sleep a tiny bit just to let maybe some background calls happen
|
|
// then verify that we still only got the one call
|
|
time.Sleep(20 * time.Millisecond)
|
|
typ.AssertExpectations(t)
|
|
typ2.AssertExpectations(t)
|
|
}
|
|
|
|
// Test that Get partitions the caches based on DC so two equivalent requests
|
|
// to different datacenters are automatically cached even if their keys are
|
|
// the same.
|
|
func TestCacheGet_partitionDC(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
c := TestCache(t)
|
|
c.RegisterType("t", &testPartitionType{}, nil)
|
|
|
|
// Perform multiple gets
|
|
getCh1 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
|
|
Datacenter: "dc1", Key: "hello"}))
|
|
getCh2 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
|
|
Datacenter: "dc9", Key: "hello"}))
|
|
|
|
// Should return both!
|
|
TestCacheGetChResult(t, getCh1, "dc1")
|
|
TestCacheGetChResult(t, getCh2, "dc9")
|
|
}
|
|
|
|
// Test that Get partitions the caches based on token so two equivalent requests
|
|
// with different ACL tokens do not return the same result.
|
|
func TestCacheGet_partitionToken(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
c := TestCache(t)
|
|
c.RegisterType("t", &testPartitionType{}, nil)
|
|
|
|
// Perform multiple gets
|
|
getCh1 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
|
|
Token: "", Key: "hello"}))
|
|
getCh2 := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{
|
|
Token: "foo", Key: "hello"}))
|
|
|
|
// Should return both!
|
|
TestCacheGetChResult(t, getCh1, "")
|
|
TestCacheGetChResult(t, getCh2, "foo")
|
|
}
|
|
|
|
// testPartitionType implements Type for testing that simply returns a value
|
|
// comprised of the request DC and ACL token, used for testing cache
|
|
// partitioning.
|
|
type testPartitionType struct{}
|
|
|
|
func (t *testPartitionType) Fetch(opts FetchOptions, r Request) (FetchResult, error) {
|
|
info := r.CacheInfo()
|
|
return FetchResult{
|
|
Value: fmt.Sprintf("%s%s", info.Datacenter, info.Token),
|
|
}, nil
|
|
}
|
|
|
|
func (t *testPartitionType) SupportsBlocking() bool {
|
|
return true
|
|
}
|
|
|
|
// Test that background refreshing reports correct Age in failure and happy
|
|
// states.
|
|
func TestCacheGet_refreshAge(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
Refresh: true,
|
|
RefreshTimer: 0,
|
|
RefreshTimeout: 5 * time.Minute,
|
|
})
|
|
|
|
// Configure the type
|
|
var index, shouldFail uint64
|
|
|
|
typ.On("Fetch", mock.Anything, mock.Anything).
|
|
Return(func(o FetchOptions, r Request) FetchResult {
|
|
idx := atomic.LoadUint64(&index)
|
|
if atomic.LoadUint64(&shouldFail) == 1 {
|
|
t.Logf("Failing Fetch at index %d", idx)
|
|
return FetchResult{Value: nil, Index: idx}
|
|
}
|
|
if o.MinIndex == idx {
|
|
t.Logf("Sleeping Fetch at index %d", idx)
|
|
// Simulate waiting for a new value
|
|
time.Sleep(5 * time.Millisecond)
|
|
}
|
|
t.Logf("Returning Fetch at index %d", idx)
|
|
return FetchResult{Value: int(idx * 2), Index: idx}
|
|
}, func(o FetchOptions, r Request) error {
|
|
if atomic.LoadUint64(&shouldFail) == 1 {
|
|
return errors.New("test error")
|
|
}
|
|
return nil
|
|
})
|
|
|
|
// Set initial index/value
|
|
atomic.StoreUint64(&index, 4)
|
|
|
|
// Fetch
|
|
resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
TestCacheGetChResult(t, resultCh, 8)
|
|
|
|
{
|
|
// Wait a few milliseconds after initial fetch to check age is not reporting
|
|
// actual age.
|
|
time.Sleep(2 * time.Millisecond)
|
|
|
|
// Fetch again, non-blocking
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.True(meta.Hit)
|
|
// Age should be zero since background refresh was "active"
|
|
require.Equal(time.Duration(0), meta.Age)
|
|
}
|
|
|
|
// Now fail the next background sync
|
|
atomic.StoreUint64(&shouldFail, 1)
|
|
|
|
// Wait until the current request times out and starts failing
|
|
time.Sleep(6 * time.Millisecond)
|
|
|
|
var lastAge time.Duration
|
|
{
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.True(meta.Hit)
|
|
// Age should be non-zero since background refresh was "active"
|
|
require.True(meta.Age > 0)
|
|
lastAge = meta.Age
|
|
}
|
|
// Wait a bit longer - age should increase by at least this much
|
|
time.Sleep(1 * time.Millisecond)
|
|
{
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.True(meta.Hit)
|
|
require.True(meta.Age > (lastAge + (1 * time.Millisecond)))
|
|
}
|
|
|
|
// Now unfail the background refresh
|
|
atomic.StoreUint64(&shouldFail, 0)
|
|
|
|
// And update the data so we can see when the background task is working again
|
|
// (won't be immediate due to backoff on the errors).
|
|
atomic.AddUint64(&index, 1)
|
|
|
|
t0 := time.Now()
|
|
|
|
timeout := true
|
|
// Allow up to 5 seconds since the error backoff is likely to have kicked in
|
|
// and causes this to take different amounts of time depending on how quickly
|
|
// the test thread got down here relative to the failures.
|
|
for attempts := 0; attempts < 50; attempts++ {
|
|
time.Sleep(100 * time.Millisecond)
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
// Should never error even if background is failing as we have cached value
|
|
require.NoError(err)
|
|
require.True(meta.Hit)
|
|
// Got the new value!
|
|
if result == 10 {
|
|
// Age should be zero since background refresh is "active" again
|
|
t.Logf("Succeeded after %d attempts", attempts)
|
|
require.Equal(time.Duration(0), meta.Age)
|
|
timeout = false
|
|
break
|
|
}
|
|
}
|
|
require.False(timeout, "failed to observe update after %s", time.Since(t0))
|
|
}
|
|
|
|
func TestCacheGet_nonRefreshAge(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
require := require.New(t)
|
|
|
|
typ := TestType(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
c.RegisterType("t", typ, &RegisterOptions{
|
|
Refresh: false,
|
|
LastGetTTL: 100 * time.Millisecond,
|
|
})
|
|
|
|
// Configure the type
|
|
var index uint64
|
|
|
|
typ.On("Fetch", mock.Anything, mock.Anything).
|
|
Return(func(o FetchOptions, r Request) FetchResult {
|
|
idx := atomic.LoadUint64(&index)
|
|
return FetchResult{Value: int(idx * 2), Index: idx}
|
|
}, nil)
|
|
|
|
// Set initial index/value
|
|
atomic.StoreUint64(&index, 4)
|
|
|
|
// Fetch
|
|
resultCh := TestCacheGetCh(t, c, "t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
TestCacheGetChResult(t, resultCh, 8)
|
|
|
|
var lastAge time.Duration
|
|
{
|
|
// Wait a few milliseconds after initial fetch to check age IS reporting
|
|
// actual age.
|
|
time.Sleep(5 * time.Millisecond)
|
|
|
|
// Fetch again, non-blocking
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.True(meta.Hit)
|
|
require.True(meta.Age > (5 * time.Millisecond))
|
|
lastAge = meta.Age
|
|
}
|
|
|
|
// Wait for expiry
|
|
time.Sleep(200 * time.Millisecond)
|
|
|
|
{
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.False(meta.Hit)
|
|
// Age should smaller again
|
|
require.True(meta.Age < lastAge)
|
|
}
|
|
|
|
{
|
|
// Wait for a non-trivial amount of time to sanity check the age increases at
|
|
// least this amount. Note that this is not a fudge for some timing-dependent
|
|
// background work it's just ensuring a non-trivial time elapses between the
|
|
// request above and below serilaly in this thread so short time is OK.
|
|
time.Sleep(5 * time.Millisecond)
|
|
|
|
// Fetch again, non-blocking
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{Key: "hello"}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.True(meta.Hit)
|
|
require.True(meta.Age > (5 * time.Millisecond))
|
|
lastAge = meta.Age
|
|
}
|
|
|
|
// Now verify that setting MaxAge results in cache invalidation
|
|
{
|
|
result, meta, err := c.Get("t", TestRequest(t, RequestInfo{
|
|
Key: "hello",
|
|
MaxAge: 1 * time.Millisecond,
|
|
}))
|
|
require.NoError(err)
|
|
require.Equal(8, result)
|
|
require.False(meta.Hit)
|
|
// Age should smaller again
|
|
require.True(meta.Age < lastAge)
|
|
}
|
|
}
|
|
|
|
func TestCacheGet_nonBlockingType(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
typ := TestTypeNonBlocking(t)
|
|
defer typ.AssertExpectations(t)
|
|
c := TestCache(t)
|
|
c.RegisterType("t", typ, nil)
|
|
|
|
// Configure the type
|
|
typ.Static(FetchResult{Value: 42, Index: 1}, nil).Once()
|
|
typ.Static(FetchResult{Value: 43, Index: 2}, nil).Twice().
|
|
Run(func(args mock.Arguments) {
|
|
opts := args.Get(0).(FetchOptions)
|
|
// MinIndex should never be set for a non-blocking type.
|
|
require.Equal(t, uint64(0), opts.MinIndex)
|
|
})
|
|
|
|
require := require.New(t)
|
|
|
|
// Get, should fetch
|
|
req := TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err := c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Get, should not fetch since we have a cached value
|
|
req = TestRequest(t, RequestInfo{Key: "hello"})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.True(meta.Hit)
|
|
|
|
// Get, should not attempt to fetch with blocking even if requested. The
|
|
// assertions below about the value being the same combined with the fact the
|
|
// mock will only return that value on first call suffice to show that
|
|
// blocking request is not being attempted.
|
|
req = TestRequest(t, RequestInfo{
|
|
Key: "hello",
|
|
MinIndex: 1,
|
|
Timeout: 10 * time.Minute,
|
|
})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(42, result)
|
|
require.True(meta.Hit)
|
|
|
|
time.Sleep(10 * time.Millisecond)
|
|
|
|
// Get with a max age should fetch again
|
|
req = TestRequest(t, RequestInfo{Key: "hello", MaxAge: 5 * time.Millisecond})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(43, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Get with a must revalidate should fetch again even without a delay.
|
|
req = TestRequest(t, RequestInfo{Key: "hello", MustRevalidate: true})
|
|
result, meta, err = c.Get("t", req)
|
|
require.NoError(err)
|
|
require.Equal(43, result)
|
|
require.False(meta.Hit)
|
|
|
|
// Sleep a tiny bit just to let maybe some background calls happen
|
|
// then verify that we still only got the one call
|
|
time.Sleep(20 * time.Millisecond)
|
|
typ.AssertExpectations(t)
|
|
}
|