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db: fix c and go iterators

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This commit is contained in:
Ethan Buchman
2017-12-13 22:28:37 -05:00
parent d4aeca8ce3
commit a2f7898b6d
3 changed files with 79 additions and 86 deletions
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101
db/util_test.go
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@ -5,6 +5,7 @@ import (
"testing"
)
// empty iterator for empty db
func TestPrefixIteratorNoMatchNil(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
@ -16,6 +17,7 @@ func TestPrefixIteratorNoMatchNil(t *testing.T) {
}
}
// empty iterator for db populated after iterator created
func TestPrefixIteratorNoMatch1(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
@ -28,24 +30,8 @@ func TestPrefixIteratorNoMatch1(t *testing.T) {
}
}
func TestPrefixIteratorMatch2(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
db.SetSync(bz("2"), bz("value_2"))
itr := IteratePrefix(db, []byte("2"))
checkValid(t, itr, true)
checkItem(t, itr, bz("2"), bz("value_2"))
checkNext(t, itr, false)
// Once invalid...
checkInvalid(t, itr)
})
}
}
func TestPrefixIteratorMatch3(t *testing.T) {
// empty iterator for prefix starting above db entry
func TestPrefixIteratorNoMatch2(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
@ -58,14 +44,40 @@ func TestPrefixIteratorMatch3(t *testing.T) {
}
}
// Search for a/1, fail by too much Next()
// iterator with single val for db with single val, starting from that val
func TestPrefixIteratorMatch1(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
db.SetSync(bz("2"), bz("value_2"))
itr := IteratePrefix(db, bz("2"))
checkValid(t, itr, true)
checkItem(t, itr, bz("2"), bz("value_2"))
checkNext(t, itr, false)
// Once invalid...
checkInvalid(t, itr)
})
}
}
// iterator with prefix iterates over everything with same prefix
func TestPrefixIteratorMatches1N(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
// prefixed
db.SetSync(bz("a/1"), bz("value_1"))
db.SetSync(bz("a/3"), bz("value_3"))
itr := IteratePrefix(db, []byte("a/"))
// not
db.SetSync(bz("b/3"), bz("value_3"))
db.SetSync(bz("a-3"), bz("value_3"))
db.SetSync(bz("a.3"), bz("value_3"))
db.SetSync(bz("abcdefg"), bz("value_3"))
itr := IteratePrefix(db, bz("a/"))
checkValid(t, itr, true)
checkItem(t, itr, bz("a/1"), bz("value_1"))
@ -75,54 +87,7 @@ func TestPrefixIteratorMatches1N(t *testing.T) {
// Bad!
checkNext(t, itr, false)
// Once invalid...
checkInvalid(t, itr)
})
}
}
// Search for a/2, fail by too much Next()
func TestPrefixIteratorMatches2N(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
db.SetSync(bz("a/1"), bz("value_1"))
db.SetSync(bz("a/3"), bz("value_3"))
itr := IteratePrefix(db, []byte("a/"))
checkValid(t, itr, true)
checkItem(t, itr, bz("a/1"), bz("value_1"))
checkNext(t, itr, true)
checkValid(t, itr, true)
checkItem(t, itr, bz("a/3"), bz("value_3"))
// Bad!
checkNext(t, itr, false)
// Once invalid...
checkInvalid(t, itr)
})
}
}
// Search for a/3, fail by too much Next()
func TestPrefixIteratorMatches3N(t *testing.T) {
for backend, _ := range backends {
t.Run(fmt.Sprintf("Prefix w/ backend %s", backend), func(t *testing.T) {
db := newTempDB(t, backend)
db.SetSync(bz("a/1"), bz("value_1"))
db.SetSync(bz("a/3"), bz("value_3"))
itr := IteratePrefix(db, []byte("a/"))
checkValid(t, itr, true)
checkItem(t, itr, bz("a/1"), bz("value_1"))
checkNext(t, itr, true)
checkItem(t, itr, bz("a/3"), bz("value_3"))
// Bad!
checkNext(t, itr, false)
// Once invalid...
//Once invalid...
checkInvalid(t, itr)
})
}