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📂 Your project directory:
📂 Directory Structure:
└ 📁 .
├ 📜 README.md
├ 📜 driver.go
├ 📜 go.mod
├ 📜 output.txt
└ 📜 preprocessor.go
📂 Go Files:
┣ 📜 driver.go
```go
package bingo
import (
"errors"
"fmt"
"github.com/go-playground/validator/v10"
jsoniter "github.com/json-iterator/go"
"go.etcd.io/bbolt"
"os"
"strings"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
var AllDocuments = -1
var (
ErrDocumentNotFound = fmt.Errorf("document not found")
ErrDocumentExists = fmt.Errorf("document already exists")
)
type WrappedBucket struct {
*bbolt.Bucket
}
func (b *WrappedBucket) ReverseIter(fn func(k, v []byte) error) error {
if b.Tx().DB() == nil {
return fmt.Errorf("tx is closed")
}
c := b.Cursor()
for k, v := c.Last(); k != nil; k, v = c.Prev() {
if err := fn(k, v); err != nil {
return err
}
}
return nil
}
func IsErrDocumentNotFound(err error) bool {
return strings.Contains(err.Error(), ErrDocumentNotFound.Error())
}
func IsErrDocumentExists(err error) bool {
return strings.Contains(err.Error(), ErrDocumentExists.Error())
}
type DriverConfiguration struct {
DeleteNoVerify bool
Filename string
}
type Driver struct {
db *bbolt.DB
val *validator.Validate
config *DriverConfiguration
}
func NewDriver(config DriverConfiguration) (*Driver, error) {
db, err := bbolt.Open(config.Filename, 0600, nil)
if err != nil {
return nil, err
}
return &Driver{
db: db,
val: validator.New(validator.WithRequiredStructEnabled()),
config: &config,
}, nil
}
func (d *Collection[DocumentType]) Drop() error {
if !d.Driver.config.DeleteNoVerify {
if r, _ := os.LookupEnv("BINGO_ALLOW_DROP_" + strings.ToUpper(d.Name)); r != "true" {
return fmt.Errorf("delete not allowed, set environment variable BINGO_ALLOW_DROP_%s=true to allow", strings.ToUpper(d.Name))
}
}
return d.Driver.db.Update(func(tx *bbolt.Tx) error {
return tx.DeleteBucket([]byte(d.Name))
})
}
type CollectionProps struct {
Name string
CacheSize int
}
type DocumentSpec interface {
Key() []byte
}
type HasUpdate interface {
Update() error
}
type Collection[DocumentType DocumentSpec] struct {
Driver *Driver
Name string
nameBytes []byte
beforeUpdate func(doc *DocumentType) error
afterUpdate func(doc *DocumentType) error
beforeDelete func(doc *DocumentType) error
afterDelete func(doc *DocumentType) error
beforeInsert func(doc *DocumentType) error
afterInsert func(doc *DocumentType) error
}
func (c *Collection[T]) BeforeUpdate(f func(doc *T) error) *Collection[T] {
c.beforeUpdate = f
return c
}
func (c *Collection[T]) AfterUpdate(f func(doc *T) error) *Collection[T] {
c.afterUpdate = f
return c
}
func (c *Collection[T]) BeforeDelete(f func(doc *T) error) *Collection[T] {
c.beforeDelete = f
return c
}
func (c *Collection[T]) AfterDelete(f func(doc *T) error) *Collection[T] {
c.afterDelete = f
return c
}
func (c *Collection[T]) BeforeInsert(f func(doc *T) error) *Collection[T] {
c.beforeInsert = f
return c
}
func (c *Collection[T]) AfterInsert(f func(doc *T) error) *Collection[T] {
c.afterInsert = f
return c
}
func CollectionFrom[T DocumentSpec](driver *Driver, name string) *Collection[T] {
return &Collection[T]{
Driver: driver,
Name: name,
nameBytes: []byte(name),
}
}
type InsertResult struct {
Success bool
Errors []error
InsertedId []byte
}
func (ir *InsertResult) Error() error {
if len(ir.Errors) == 0 {
return nil
}
var s []string
for _, err := range ir.Errors {
s = append(s, err.Error())
}
return fmt.Errorf(strings.Join(s, ": "))
}
func (ir *InsertResult) fail(errs ...error) {
ir.Success = false
for _, err := range errs {
if err != nil {
ir.Errors = append(ir.Errors, err)
}
}
}
func (c *Collection[T]) Insert(document T) (ir *InsertResult) {
_, err := c.FindById(document.Key())
if err != nil && errors.Is(err, ErrDocumentNotFound) {
return c.InsertOrUpsert(document)
}
if err != nil && !errors.Is(err, ErrDocumentNotFound) {
return &InsertResult{Errors: []error{err}}
}
return &InsertResult{Errors: []error{ErrDocumentExists, fmt.Errorf("key %v already exists", string(document.Key()))}}
}
func (c *Collection[T]) InsertOrUpsert(document T) (ir *InsertResult) {
ir = &InsertResult{
Success: true,
}
if err := c.Driver.val.Struct(document); err != nil {
ir.fail(err)
return
}
if c.beforeInsert != nil {
err := c.beforeInsert(&document)
if err != nil {
ir.fail(err)
return
}
}
marshal, err := json.Marshal(document)
if err != nil {
ir.fail(err)
return
}
var idBytes []byte
ir.fail(c.Driver.db.Update(func(tx *bbolt.Tx) error {
bucket, err := tx.CreateBucketIfNotExists(c.nameBytes)
if err != nil {
return err
}
key := document.Key()
if len(key) == 0 {
uniqueId, _ := bucket.NextSequence()
idBytes = []byte(fmt.Sprintf("%v", uniqueId))
} else {
idBytes = key
}
return bucket.Put(idBytes, marshal)
}))
if c.afterInsert != nil {
err := c.afterInsert(&document)
if err != nil {
ir.fail(err)
return
}
}
ir.InsertedId = idBytes
return
}
func (c *Collection[T]) FindById(id []byte) (T, error) {
var document T
err := c.Driver.db.View(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(c.nameBytes)
if bucket == nil {
return errors.Join(ErrDocumentNotFound, fmt.Errorf("document with id %v not found", string(id)))
}
value := bucket.Get(id)
if value == nil {
return errors.Join(ErrDocumentNotFound, fmt.Errorf("document with id %v not found", string(id)))
}
return json.Unmarshal(value, &document)
})
return document, err
}
var stoperr = fmt.Errorf("stop")
func (c *Collection[DocumentType]) queryKeys(keys ...string) []DocumentType {
var documents []DocumentType
_ = c.Driver.db.View(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(c.nameBytes)
if bucket == nil {
return fmt.Errorf("bucket %s not found", c.Name)
}
for _, key := range keys {
value := bucket.Get([]byte(key))
if value == nil {
continue
}
var document DocumentType
err := json.Unmarshal(value, &document)
if err != nil {
continue
}
documents = append(documents, document)
}
return nil
})
return documents
}
func (c *Collection[T]) queryFind(q Query[T]) ([]T, int, error) {
var documents []T
var currentFound = 0
var last = 0
err := c.Driver.db.View(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(c.nameBytes)
if bucket == nil {
return fmt.Errorf("bucket %s not found", c.Name)
}
wbucket := &WrappedBucket{bucket}
return wbucket.ReverseIter(func(k, v []byte) error {
last += 1
if last <= q.Skip {
return nil
}
var document T
err := json.Unmarshal(v, &document)
if err != nil {
return err
}
if q.Filter(document) {
documents = append(documents, document)
currentFound += 1
if q.Count > 0 && currentFound >= q.Count {
return stoperr
}
}
return nil
})
})
if err != nil && !errors.Is(err, stoperr) {
return documents, last, err
}
return documents, last, err
}
type Query[T DocumentSpec] struct {
Filter func(doc T) bool
Skip int
Count int
Keys []string
}
func (c *Collection[T]) Query(q Query[T]) *QueryResult[T] {
if q.Keys != nil && q.Filter != nil {
panic(fmt.Errorf("cannot use both key and filter"))
}
result := &QueryResult[T]{
Collection: c,
}
if q.Keys != nil {
items := c.queryKeys(q.Keys...)
for _, item := range items {
item := item
result.Items = append(result.Items, &item)
}
return result
}
if q.Filter != nil {
items, last, err := c.queryFind(q)
if err != nil {
result.Error = errors.Join(err, fmt.Errorf("error while querying"))
}
result.Last = last
for _, item := range items {
item := item
result.Items = append(result.Items, &item)
}
return result
}
result.Error = fmt.Errorf("no query provided")
return result
}
type QueryResult[T DocumentSpec] struct {
Collection *Collection[T]
Items []*T
Last int
Error error
}
func (qr *QueryResult[T]) JSONResponse() map[string]any {
if !qr.Any() {
return map[string]any{
"result": []any{},
"count": 0,
"next": 0,
}
}
return map[string]any{
"result": qr.Items,
"count": len(qr.Items),
"next": qr.Last,
}
}
func (qr *QueryResult[T]) Count() int {
return len(qr.Items)
}
func (qr *QueryResult[T]) First() *T {
if len(qr.Items) == 0 {
return new(T)
}
return qr.Items[0]
}
func (qr *QueryResult[T]) Any() bool {
return len(qr.Items) > 0
}
func (qr *QueryResult[T]) Iter(f func(doc *T) error) *QueryResult[T] {
if qr.Error != nil {
return qr
}
for _, document := range qr.Items {
err := f(document)
if err != nil {
qr.Error = err
return qr
}
}
return qr
}
func (qr *QueryResult[T]) Filter(f func(doc *T) bool) *QueryResult[T] {
if qr.Error != nil {
return qr
}
var items []*T
for _, document := range qr.Items {
if f(document) {
items = append(items, document)
}
}
qr.Items = items
return qr
}
func (qr *QueryResult[T]) Validate(f func(qr *QueryResult[T]) error) *QueryResult[T] {
if qr.Error != nil {
return qr
}
err := f(qr)
if err != nil {
qr.Error = err
}
return qr
}
func (qr *QueryResult[T]) Delete() error {
if qr.Error != nil {
return qr.Error
}
return qr.Collection.Driver.db.Update(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(qr.Collection.nameBytes)
if bucket == nil {
return fmt.Errorf("bucket %s not found", qr.Collection.Name)
}
for _, document := range qr.Items {
if qr.Collection.beforeDelete != nil {
err := qr.Collection.beforeDelete(document)
if err != nil {
return err
}
}
err := bucket.Delete((*document).Key())
if err != nil {
return err
}
if qr.Collection.afterDelete != nil {
err := qr.Collection.afterDelete(document)
if err != nil {
return err
}
}
}
return nil
})
}
func (qr *QueryResult[T]) Update() error {
if qr.Error != nil {
return qr.Error
}
return qr.Collection.Driver.db.Update(func(tx *bbolt.Tx) error {
bucket := tx.Bucket(qr.Collection.nameBytes)
if bucket == nil {
return fmt.Errorf("bucket %s not found", qr.Collection.Name)
}
for _, document := range qr.Items {
if qr.Collection.beforeUpdate != nil {
err := qr.Collection.beforeUpdate(document)
if err != nil {
return err
}
}
data, err := json.Marshal(document)
if err != nil {
return err
}
err = bucket.Put((*document).Key(), data)
if err != nil {
return err
}
if qr.Collection.afterUpdate != nil {
err := qr.Collection.afterUpdate(document)
if err != nil {
return err
}
}
}
return nil
})
}
```
┣ 📜 preprocessor.go
```go
package bingo
import (
"fmt"
"reflect"
)
type Preprocessor[T any] interface {
Name() string
To(T) ([]byte, error)
From([]byte) (T, error)
}
type Guard interface {
Name() string
Check(any) error
}
type GuardNotNull struct{}
func (g *GuardNotNull) Name() string {
return "notnull"
}
func (g *GuardNotNull) Check(val any) error {
if reflect.ValueOf(val).IsNil() {
return fmt.Errorf("value is nil")
}
return nil
}
type GuardNotEmpty struct{}
func (g *GuardNotEmpty) Name() string {
return "notempty"
}
func (g *GuardNotEmpty) Check(val any) error {
if val.(string) == "" {
return fmt.Errorf("value is empty")
}
return nil
}
```