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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 seek to the appropriate keys.
func TestCursor_Seek(t *testing.T) {
withDB(func(db *bolt.DB) {
db.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucket([]byte("widgets"))
assert.NoError(t, err)
assert.NoError(t, b.Put([]byte("foo"), []byte("0001")))
assert.NoError(t, b.Put([]byte("bar"), []byte("0002")))
assert.NoError(t, b.Put([]byte("baz"), []byte("0003")))
_, err = b.CreateBucket([]byte("bkt"))
assert.NoError(t, err)
return nil
})
db.View(func(tx *bolt.Tx) error {
c := NewCursor(tx.Bucket([]byte("widgets")))
// Exact match should go to the key.
k, v, flags := c.Seek([]byte("bar"))
assert.Equal(t, "bar", string(k))
assert.Equal(t, "0002", string(v))
assert.Equal(t, 0, flags)
// Inexact match should go to the next key.
k, v, flags = c.Seek([]byte("bas"))
assert.Equal(t, "baz", string(k))
assert.Equal(t, "0003", string(v))
assert.Equal(t, 0, flags)
// Low key should go to the first key.
k, v, flags = c.Seek([]byte(""))
assert.Equal(t, "bar", string(k))
assert.Equal(t, "0002", string(v))
assert.Equal(t, 0, flags)
// High key should return no key.
k, v, flags = c.Seek([]byte("zzz"))
assert.Equal(t, "", string(k))
assert.Equal(t, "", string(v))
assert.Equal(t, 0, flags)
// Buckets should return their key but no value.
k, v, flags = c.Seek([]byte("bkt"))
assert.Equal(t, []byte("bkt"), k)
assert.True(t, len(v) > 0)
assert.Equal(t, 1, flags) // bucketLeafFlag
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
})
})
}
// Ensure that a C cursor can iterate over branches and leafs.
func TestCursor_Iterate_Large(t *testing.T) {
withDB(func(db *bolt.DB) {
db.Update(func(tx *bolt.Tx) error {
b, _ := tx.CreateBucket([]byte("widgets"))
for i := 0; i < 1000; i++ {
b.Put([]byte(fmt.Sprintf("%05d", i)), []byte(fmt.Sprintf("%020d", i)))
}
return nil
})
db.View(func(tx *bolt.Tx) error {
var index int
c := NewCursor(tx.Bucket([]byte("widgets")))
for k, v := c.First(); len(k) > 0; k, v = c.Next() {
assert.Equal(t, fmt.Sprintf("%05d", index), string(k))
assert.Equal(t, fmt.Sprintf("%020d", index), string(v))
index++
}
assert.Equal(t, 1000, index)
return nil
})
})
}
// Ensure that a C cursor can seek over branches and leafs.
func TestCursor_Seek_Large(t *testing.T) {
withDB(func(db *bolt.DB) {
db.Update(func(tx *bolt.Tx) error {
b, _ := tx.CreateBucket([]byte("widgets"))
for i := 1; i < 1000; i++ {
b.Put([]byte(fmt.Sprintf("%05d\000", i*10)), []byte(fmt.Sprintf("%020d", i*10)))
}
return nil
})
db.View(func(tx *bolt.Tx) error {
c := NewCursor(tx.Bucket([]byte("widgets")))
fmt.Println("// Exact match should go to the key.")
k, v, _ := c.Seek([]byte("05000\000"))
assert.Equal(t, "05000\000", string(k))
assert.Equal(t, fmt.Sprintf("%020d", 5000), string(v))
fmt.Println("// Inexact match should go to the next key.")
k, v, _ = c.Seek([]byte("07495\000"))
assert.Equal(t, "07500\000", string(k))
assert.Equal(t, fmt.Sprintf("%020d", 7500), string(v))
fmt.Println("// Low key should go to the first key.")
k, v, _ = c.Seek([]byte("00000\000"))
assert.Equal(t, "00010\000", string(k))
assert.Equal(t, fmt.Sprintf("%020d", 10), string(v))
fmt.Println("// High key should return no key.")
k, v, _ = c.Seek([]byte("40000\000"))
assert.Equal(t, "", string(k))
assert.Equal(t, "", string(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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