lnd.xprv/channeldb/kvdb/etcd/readwrite_cursor_test.go

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// +build kvdb_etcd
package etcd
import (
"testing"
"github.com/btcsuite/btcwallet/walletdb"
"github.com/stretchr/testify/assert"
)
func TestReadCursorEmptyInterval(t *testing.T) {
t.Parallel()
f := NewEtcdTestFixture(t)
defer f.Cleanup()
db, err := newEtcdBackend(f.BackendConfig())
assert.NoError(t, err)
err = db.Update(func(tx walletdb.ReadWriteTx) error {
b, err := tx.CreateTopLevelBucket([]byte("alma"))
assert.NoError(t, err)
assert.NotNil(t, b)
return nil
})
assert.NoError(t, err)
err = db.View(func(tx walletdb.ReadTx) error {
b := tx.ReadBucket([]byte("alma"))
assert.NotNil(t, b)
cursor := b.ReadCursor()
k, v := cursor.First()
assert.Nil(t, k)
assert.Nil(t, v)
k, v = cursor.Next()
assert.Nil(t, k)
assert.Nil(t, v)
k, v = cursor.Last()
assert.Nil(t, k)
assert.Nil(t, v)
k, v = cursor.Prev()
assert.Nil(t, k)
assert.Nil(t, v)
return nil
})
assert.NoError(t, err)
}
func TestReadCursorNonEmptyInterval(t *testing.T) {
t.Parallel()
f := NewEtcdTestFixture(t)
defer f.Cleanup()
db, err := newEtcdBackend(f.BackendConfig())
assert.NoError(t, err)
testKeyValues := []KV{
{"b", "1"},
{"c", "2"},
{"da", "3"},
{"e", "4"},
}
err = db.Update(func(tx walletdb.ReadWriteTx) error {
b, err := tx.CreateTopLevelBucket([]byte("alma"))
assert.NoError(t, err)
assert.NotNil(t, b)
for _, kv := range testKeyValues {
assert.NoError(t, b.Put([]byte(kv.key), []byte(kv.val)))
}
return nil
})
assert.NoError(t, err)
err = db.View(func(tx walletdb.ReadTx) error {
b := tx.ReadBucket([]byte("alma"))
assert.NotNil(t, b)
// Iterate from the front.
var kvs []KV
cursor := b.ReadCursor()
k, v := cursor.First()
for k != nil && v != nil {
kvs = append(kvs, KV{string(k), string(v)})
k, v = cursor.Next()
}
assert.Equal(t, testKeyValues, kvs)
// Iterate from the back.
kvs = []KV{}
k, v = cursor.Last()
for k != nil && v != nil {
kvs = append(kvs, KV{string(k), string(v)})
k, v = cursor.Prev()
}
assert.Equal(t, reverseKVs(testKeyValues), kvs)
// Random access
perm := []int{3, 0, 2, 1}
for _, i := range perm {
k, v := cursor.Seek([]byte(testKeyValues[i].key))
assert.Equal(t, []byte(testKeyValues[i].key), k)
assert.Equal(t, []byte(testKeyValues[i].val), v)
}
// Seek to nonexisting key.
k, v = cursor.Seek(nil)
assert.Nil(t, k)
assert.Nil(t, v)
k, v = cursor.Seek([]byte("x"))
assert.Nil(t, k)
assert.Nil(t, v)
return nil
})
assert.NoError(t, err)
}
func TestReadWriteCursor(t *testing.T) {
t.Parallel()
f := NewEtcdTestFixture(t)
defer f.Cleanup()
db, err := newEtcdBackend(f.BackendConfig())
assert.NoError(t, err)
testKeyValues := []KV{
{"b", "1"},
{"c", "2"},
{"da", "3"},
{"e", "4"},
}
count := len(testKeyValues)
// Pre-store the first half of the interval.
assert.NoError(t, db.Update(func(tx walletdb.ReadWriteTx) error {
b, err := tx.CreateTopLevelBucket([]byte("apple"))
assert.NoError(t, err)
assert.NotNil(t, b)
for i := 0; i < count/2; i++ {
err = b.Put(
[]byte(testKeyValues[i].key),
[]byte(testKeyValues[i].val),
)
assert.NoError(t, err)
}
return nil
}))
err = db.Update(func(tx walletdb.ReadWriteTx) error {
b := tx.ReadWriteBucket([]byte("apple"))
assert.NotNil(t, b)
// Store the second half of the interval.
for i := count / 2; i < count; i++ {
err = b.Put(
[]byte(testKeyValues[i].key),
[]byte(testKeyValues[i].val),
)
assert.NoError(t, err)
}
cursor := b.ReadWriteCursor()
// First on valid interval.
fk, fv := cursor.First()
assert.Equal(t, []byte("b"), fk)
assert.Equal(t, []byte("1"), fv)
// Prev(First()) = nil
k, v := cursor.Prev()
assert.Nil(t, k)
assert.Nil(t, v)
// Last on valid interval.
lk, lv := cursor.Last()
assert.Equal(t, []byte("e"), lk)
assert.Equal(t, []byte("4"), lv)
// Next(Last()) = nil
k, v = cursor.Next()
assert.Nil(t, k)
assert.Nil(t, v)
// Delete first item, then add an item before the
// deleted one. Check that First/Next will "jump"
// over the deleted item and return the new first.
_, _ = cursor.First()
assert.NoError(t, cursor.Delete())
assert.NoError(t, b.Put([]byte("a"), []byte("0")))
fk, fv = cursor.First()
assert.Equal(t, []byte("a"), fk)
assert.Equal(t, []byte("0"), fv)
k, v = cursor.Next()
assert.Equal(t, []byte("c"), k)
assert.Equal(t, []byte("2"), v)
// Similarly test that a new end is returned if
// the old end is deleted first.
_, _ = cursor.Last()
assert.NoError(t, cursor.Delete())
assert.NoError(t, b.Put([]byte("f"), []byte("5")))
lk, lv = cursor.Last()
assert.Equal(t, []byte("f"), lk)
assert.Equal(t, []byte("5"), lv)
k, v = cursor.Prev()
assert.Equal(t, []byte("da"), k)
assert.Equal(t, []byte("3"), v)
// Overwrite k/v in the middle of the interval.
assert.NoError(t, b.Put([]byte("c"), []byte("3")))
k, v = cursor.Prev()
assert.Equal(t, []byte("c"), k)
assert.Equal(t, []byte("3"), v)
// Insert new key/values.
assert.NoError(t, b.Put([]byte("cx"), []byte("x")))
assert.NoError(t, b.Put([]byte("cy"), []byte("y")))
k, v = cursor.Next()
assert.Equal(t, []byte("cx"), k)
assert.Equal(t, []byte("x"), v)
k, v = cursor.Next()
assert.Equal(t, []byte("cy"), k)
assert.Equal(t, []byte("y"), v)
expected := []KV{
{"a", "0"},
{"c", "3"},
{"cx", "x"},
{"cy", "y"},
{"da", "3"},
{"f", "5"},
}
// Iterate from the front.
var kvs []KV
k, v = cursor.First()
for k != nil && v != nil {
kvs = append(kvs, KV{string(k), string(v)})
k, v = cursor.Next()
}
assert.Equal(t, expected, kvs)
// Iterate from the back.
kvs = []KV{}
k, v = cursor.Last()
for k != nil && v != nil {
kvs = append(kvs, KV{string(k), string(v)})
k, v = cursor.Prev()
}
assert.Equal(t, reverseKVs(expected), kvs)
return nil
})
assert.NoError(t, err)
expected := map[string]string{
bkey("apple"): bval("apple"),
vkey("a", "apple"): "0",
vkey("c", "apple"): "3",
vkey("cx", "apple"): "x",
vkey("cy", "apple"): "y",
vkey("da", "apple"): "3",
vkey("f", "apple"): "5",
}
assert.Equal(t, expected, f.Dump())
}