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package state
import (
"fmt"
memdb "github.com/hashicorp/go-memdb"
"github.com/kong/deck/utils"
)
const (
consumerTableName = "consumer"
)
var consumerTableSchema = &memdb.TableSchema{
Name: consumerTableName,
Indexes: map[string]*memdb.IndexSchema{
"id": {
Name: "id",
Unique: true,
Indexer: &memdb.StringFieldIndex{Field: "ID"},
},
"Username": {
Name: "Username",
Unique: true,
Indexer: &memdb.StringFieldIndex{Field: "Username"},
AllowMissing: true,
},
all: allIndex,
},
}
// ConsumersCollection stores and indexes Kong Consumers.
type ConsumersCollection collection
// Add adds a consumer to the collection
// An error is thrown if consumer.ID is empty.
func (k *ConsumersCollection) Add(consumer Consumer) error {
if utils.Empty(consumer.ID) {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
var searchBy []string
searchBy = append(searchBy, *consumer.ID)
if !utils.Empty(consumer.Username) {
searchBy = append(searchBy, *consumer.Username)
}
_, err := getConsumer(txn, searchBy...)
if err == nil {
return fmt.Errorf("inserting consumer %v: %w", consumer.Console(), ErrAlreadyExists)
} else if err != ErrNotFound {
return err
}
err = txn.Insert(consumerTableName, &consumer)
if err != nil {
return err
}
txn.Commit()
return nil
}
func getConsumer(txn *memdb.Txn, IDs ...string) (*Consumer, error) {
for _, id := range IDs {
res, err := multiIndexLookupUsingTxn(txn, consumerTableName,
[]string{"Username", "id"}, id)
if err == ErrNotFound {
continue
}
if err != nil {
return nil, err
}
consumer, ok := res.(*Consumer)
if !ok {
panic(unexpectedType)
}
return &Consumer{Consumer: *consumer.DeepCopy()}, nil
}
return nil, ErrNotFound
}
// Get gets a consumer by name or ID.
func (k *ConsumersCollection) Get(userNameOrID string) (*Consumer, error) {
if userNameOrID == "" {
return nil, errIDRequired
}
txn := k.db.Txn(false)
defer txn.Abort()
return getConsumer(txn, userNameOrID)
}
// Update udpates an existing consumer.
// It returns an error if the consumer is not already present.
func (k *ConsumersCollection) Update(consumer Consumer) error {
// TODO abstract this in the go-memdb library itself
if utils.Empty(consumer.ID) {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
err := deleteConsumer(txn, *consumer.ID)
if err != nil {
return err
}
err = txn.Insert(consumerTableName, &consumer)
if err != nil {
return err
}
txn.Commit()
return nil
}
func deleteConsumer(txn *memdb.Txn, userNameOrID string) error {
consumer, err := getConsumer(txn, userNameOrID)
if err != nil {
return err
}
err = txn.Delete(consumerTableName, consumer)
if err != nil {
return err
}
return nil
}
// Delete deletes a consumer by name or ID.
func (k *ConsumersCollection) Delete(userNameOrID string) error {
if userNameOrID == "" {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
err := deleteConsumer(txn, userNameOrID)
if err != nil {
return err
}
txn.Commit()
return nil
}
// GetAll gets a consumer by name or ID.
func (k *ConsumersCollection) GetAll() ([]*Consumer, error) {
txn := k.db.Txn(false)
defer txn.Abort()
iter, err := txn.Get(consumerTableName, all, true)
if err != nil {
return nil, err
}
var res []*Consumer
for el := iter.Next(); el != nil; el = iter.Next() {
s, ok := el.(*Consumer)
if !ok {
panic(unexpectedType)
}
res = append(res, &Consumer{Consumer: *s.DeepCopy()})
}
txn.Commit()
return res, nil
}
|
