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package c_test
import (
"fmt"
"io/ioutil"
"os"
"testing"
"github.com/boltdb/bolt"
. "github.com/boltdb/bolt/c"
"github.com/stretchr/testify/assert"
)
// Ensure that the C cursor can
func TestCursor_First(t *testing.T) {
withDB(func(db *bolt.DB) {
db.Update(func(tx *bolt.Tx) error {
b, _ := tx.CreateBucket([]byte("widgets"))
return b.Put([]byte("foo"), []byte("barz"))
})
db.View(func(tx *bolt.Tx) error {
c := NewCursor(tx.Bucket([]byte("widgets")))
key, value := c.First()
assert.Equal(t, []byte("foo"), key)
assert.Equal(t, []byte("barz"), value)
return nil
})
})
}
// Ensure that a C cursor can iterate over a single root with a couple elements.
func TestCursor_Iterate_Leaf(t *testing.T) {
withDB(func(db *bolt.DB) {
db.Update(func(tx *bolt.Tx) error {
tx.CreateBucket([]byte("widgets"))
tx.Bucket([]byte("widgets")).Put([]byte("baz"), []byte{})
tx.Bucket([]byte("widgets")).Put([]byte("foo"), []byte{0})
tx.Bucket([]byte("widgets")).Put([]byte("bar"), []byte{1})
return nil
})
db.View(func(tx *bolt.Tx) error {
c := NewCursor(tx.Bucket([]byte("widgets")))
k, v := c.First()
assert.Equal(t, string(k), "bar")
assert.Equal(t, []byte{1}, v)
k, v = c.Next()
assert.Equal(t, string(k), "baz")
assert.Equal(t, []byte{}, v)
k, v = c.Next()
assert.Equal(t, string(k), "foo")
assert.Equal(t, []byte{0}, v)
k, v = c.Next()
assert.Equal(t, []byte{}, k)
assert.Equal(t, []byte{}, v)
k, v = c.Next()
assert.Equal(t, []byte{}, k)
assert.Equal(t, []byte{}, v)
return nil
})
})
}
// tempfile returns a temporary path.
func tempfile() string {
f, _ := ioutil.TempFile("", "bolt-c-")
f.Close()
os.Remove(f.Name())
return f.Name()
}
// withDB executes a function with an already opened database.
func withDB(fn func(*bolt.DB)) {
path := tempfile()
db, err := bolt.Open(path, 0666)
if err != nil {
panic("cannot open db: " + err.Error())
}
defer os.Remove(path)
defer db.Close()
fn(db)
// Check database consistency after every test.
mustCheck(db)
}
// mustCheck runs a consistency check on the database and panics if any errors are found.
func mustCheck(db *bolt.DB) {
if err := db.Check(); err != nil {
// Copy db off first.
var path = tempfile()
db.CopyFile(path, 0600)
if errors, ok := err.(bolt.ErrorList); ok {
for _, err := range errors {
fmt.Println(err)
}
}
fmt.Println(err)
panic("check failure: " + path)
}
}
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