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db.go
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db.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package mockdb
import (
"errors"
"github.com/ava-labs/avalanchego/database"
)
var (
errNoFunction = errors.New("user didn't specify what value(s) return")
_ database.Database = &Database{}
)
// Database is a mock database meant to be used in tests.
// You specify the database's return value(s) for a given method call by
// assign value to the corresponding member.
// For example, to specify what should happen when Has is called,
// assign a value to OnHas.
// If no value is assigned to the corresponding member, the method returns an error or nil
// If you
type Database struct {
// Executed when Has is called
OnHas func([]byte) (bool, error)
OnGet func([]byte) ([]byte, error)
OnPut func([]byte, []byte) error
OnDelete func([]byte) error
OnNewBatch func() database.Batch
OnNewIterator func() database.Iterator
OnNewIteratorWithStart func([]byte) database.Iterator
OnNewIteratorWithPrefix func([]byte) database.Iterator
OnNewIteratorWithStartAndPrefix func([]byte, []byte) database.Iterator
OnCompact func([]byte, []byte) error
OnClose func() error
OnHealthCheck func() (interface{}, error)
}
// New returns a new mock database
func New() *Database { return &Database{} }
func (db *Database) Has(k []byte) (bool, error) {
if db.OnHas == nil {
return false, errNoFunction
}
return db.OnHas(k)
}
func (db *Database) Get(k []byte) ([]byte, error) {
if db.OnGet == nil {
return nil, errNoFunction
}
return db.OnGet(k)
}
func (db *Database) Put(k, v []byte) error {
if db.OnPut == nil {
return errNoFunction
}
return db.OnPut(k, v)
}
func (db *Database) Delete(k []byte) error {
if db.OnDelete == nil {
return errNoFunction
}
return db.OnDelete(k)
}
func (db *Database) NewBatch() database.Batch {
if db.OnNewBatch == nil {
return nil
}
return db.OnNewBatch()
}
func (db *Database) NewIterator() database.Iterator {
if db.OnNewIterator == nil {
return nil
}
return db.OnNewIterator()
}
func (db *Database) NewIteratorWithStart(start []byte) database.Iterator {
if db.OnNewIteratorWithStart == nil {
return nil
}
return db.OnNewIteratorWithStart(start)
}
func (db *Database) NewIteratorWithPrefix(prefix []byte) database.Iterator {
if db.OnNewIteratorWithPrefix == nil {
return nil
}
return db.OnNewIteratorWithPrefix(prefix)
}
func (db *Database) NewIteratorWithStartAndPrefix(start, prefix []byte) database.Iterator {
if db.OnNewIteratorWithStartAndPrefix == nil {
return nil
}
return db.OnNewIteratorWithStartAndPrefix(start, prefix)
}
func (db *Database) Compact(start []byte, limit []byte) error {
if db.OnCompact == nil {
return errNoFunction
}
return db.OnCompact(start, limit)
}
func (db *Database) Close() error {
if db.OnClose == nil {
return errNoFunction
}
return db.OnClose()
}
func (db *Database) HealthCheck() (interface{}, error) {
if db.OnHealthCheck == nil {
return nil, errNoFunction
}
return db.OnHealthCheck()
}