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persist_test.go
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/
persist_test.go
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package lizt_test
import (
"errors"
"reflect"
"testing"
"git.faze.center/netr/lizt"
)
func TestPersistentIterator_Next(t *testing.T) {
numbers := []string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}
iter := lizt.NewSliceIterator(nameNumbers, numbers, false)
mem := NewInMemoryPersister()
p, err := lizt.NewPersistentIterator(
lizt.PersistentIteratorConfig{
PointerIter: iter,
Persister: mem,
},
)
if err != nil {
t.Errorf("NewPersistentIterator expected no error, got %v", err)
}
next, err := p.Next(5)
if err != nil {
t.Errorf("Next expected no error, got %v", err)
}
if !reflect.DeepEqual(next, numbers[:5]) {
t.Errorf("Expected %v, got %v", numbers[:5], next)
}
if mem.pointers[nameNumbers] != 5 {
t.Errorf("Expected %d, got %d", 5, mem.pointers[nameNumbers])
}
}
func TestPersistentIterator_Slice_Next_ShouldBeOffsetBy_Two_AfterPersistenceInit(t *testing.T) {
numbers := []string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}
iter := lizt.NewSliceIterator(nameNumbers, numbers, false)
mem := NewInMemoryPersister()
mem.pointers[nameNumbers] = 2
p, err := lizt.NewPersistentIterator(
lizt.PersistentIteratorConfig{
PointerIter: iter,
Persister: mem,
},
)
if err != nil {
t.Errorf("NewPersistentIterator expected no error, got %v", err)
}
next, err := p.Next(5)
if err != nil {
t.Errorf("Next expected no error, got %v", err)
}
if !reflect.DeepEqual(next, numbers[2:7]) {
t.Errorf("Expected %v, got %v", numbers[2:7], next)
}
if mem.pointers[nameNumbers] != 7 {
t.Errorf("Expected %d, got %d", 7, mem.pointers[nameNumbers])
}
}
func TestPersistentIterator_Stream_Next_ShouldBeOffsetBy_Two_AfterPersistenceInit(t *testing.T) {
iter, err := lizt.NewStreamIterator(filenameTen, false)
if err != nil {
t.Errorf("NewStreamIterator expected no error, got %v", err)
}
iterKey := "10"
mem := NewInMemoryPersister()
mem.pointers[iterKey] = 2
p, err := lizt.NewPersistentIterator(
lizt.PersistentIteratorConfig{
PointerIter: iter,
Persister: mem,
},
)
if err != nil {
t.Errorf("NewPersistentIterator expected no error, got %v", err)
}
next, err := p.Next(5)
if err != nil {
t.Errorf("Next expected no error, got %v", err)
}
expected := []string{"c", "d", "e", "f", "g"}
if !reflect.DeepEqual(next, expected) {
t.Errorf("Expected %v, got %v", expected, next)
}
if mem.pointers[iterKey] != 7 {
t.Errorf("Expected %d, got %d", 7, mem.pointers[iterKey])
}
}
func TestNewPersistentIterator_UsingSeedingIterator_Next(t *testing.T) {
numbers := []string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}
numberIter := lizt.NewSliceIterator(nameNumbers, numbers, false)
seeds := []string{"seeder1", "seeder2", "seeder3", "seeder4", "seeder5", "seeder6", "seeder7", "seeder8", "seeder9", "seeder10"}
seedSliceIter := lizt.NewSliceIterator("seedIter", seeds, true)
seedIter := lizt.NewSeedingIterator(
lizt.SeedingIteratorConfig{
PointerIter: numberIter,
SeedIter: seedSliceIter,
PlantEvery: 2,
},
)
mem := NewInMemoryPersister()
persistIter, err := lizt.NewPersistentIterator(
lizt.PersistentIteratorConfig{
PointerIter: seedIter,
Persister: mem,
},
)
if err != nil {
t.Errorf("NewPersistentIterator expected no error, got %v", err)
}
next, err := persistIter.Next(6)
if err != nil {
t.Errorf("Next expected no error, got %v", err)
}
if !reflect.DeepEqual(next, []string{"seeder1", "1", "seeder2", "2", "seeder3", "3"}) {
t.Errorf("Expected %v, got %v", []string{"seeder1", "1", "seeder2", "2", "seeder3", "3"}, next)
}
// Only 3 iterator items were pulled, the other 3 are seeds. So the pointer should be 3, not 6.
if val, err := mem.Get(nameNumbers); err != nil || val != 3 {
t.Errorf("Expected %d, got %d", 3, val)
}
}
// USED AS "MOCK" FOR TESTING.
type InMemoryPersister struct {
lizt.PersistentIterator
pointers map[string]uint64
}
func NewInMemoryPersister() *InMemoryPersister {
return &InMemoryPersister{
pointers: make(map[string]uint64, 0),
}
}
func (i *InMemoryPersister) Set(key string, value uint64) error {
i.pointers[key] = value
return nil
}
var ErrNotFound = errors.New("not found")
func (i *InMemoryPersister) Get(key string) (uint64, error) {
if val, ok := i.pointers[key]; ok {
return val, nil
}
return 0, ErrNotFound
}