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|
package state
import (
"fmt"
memdb "github.com/hashicorp/go-memdb"
"github.com/kong/deck/utils"
)
const (
upstreamTableName = "upstream"
)
var upstreamTableSchema = &memdb.TableSchema{
Name: upstreamTableName,
Indexes: map[string]*memdb.IndexSchema{
"id": {
Name: "id",
Unique: true,
Indexer: &memdb.StringFieldIndex{Field: "ID"},
},
"name": {
Name: "name",
Unique: true,
Indexer: &memdb.StringFieldIndex{Field: "Name"},
},
all: allIndex,
},
}
// UpstreamsCollection stores and indexes Kong Upstreams.
type UpstreamsCollection collection
// Add adds an upstream to the collection.
// upstream.ID should not be nil else an error is thrown.
func (k *UpstreamsCollection) Add(upstream Upstream) error {
// TODO abstract this check in the go-memdb library itself
if utils.Empty(upstream.ID) {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
var searchBy []string
searchBy = append(searchBy, *upstream.ID)
if !utils.Empty(upstream.Name) {
searchBy = append(searchBy, *upstream.Name)
}
_, err := getUpstream(txn, searchBy...)
if err == nil {
return fmt.Errorf("inserting upstream %v: %w", upstream.Console(), ErrAlreadyExists)
} else if err != ErrNotFound {
return err
}
err = txn.Insert(upstreamTableName, &upstream)
if err != nil {
return err
}
txn.Commit()
return nil
}
func getUpstream(txn *memdb.Txn, IDs ...string) (*Upstream, error) {
for _, id := range IDs {
res, err := multiIndexLookupUsingTxn(txn, upstreamTableName,
[]string{"name", "id"}, id)
if err == ErrNotFound {
continue
}
if err != nil {
return nil, err
}
upstream, ok := res.(*Upstream)
if !ok {
panic(unexpectedType)
}
return &Upstream{Upstream: *upstream.DeepCopy()}, nil
}
return nil, ErrNotFound
}
// Get gets an upstream by name or ID.
func (k *UpstreamsCollection) Get(nameOrID string) (*Upstream, error) {
if nameOrID == "" {
return nil, errIDRequired
}
txn := k.db.Txn(false)
defer txn.Abort()
upstream, err := getUpstream(txn, nameOrID)
if err != nil {
if err == ErrNotFound {
return nil, ErrNotFound
}
return nil, err
}
return upstream, nil
}
// Update udpates an existing upstream.
func (k *UpstreamsCollection) Update(upstream Upstream) error {
// TODO abstract this in the go-memdb library itself
if utils.Empty(upstream.ID) {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
err := deleteUpstream(txn, *upstream.ID)
if err != nil {
return err
}
err = txn.Insert(upstreamTableName, &upstream)
if err != nil {
return err
}
txn.Commit()
return nil
}
func deleteUpstream(txn *memdb.Txn, nameOrID string) error {
upstream, err := getUpstream(txn, nameOrID)
if err != nil {
return err
}
err = txn.Delete(upstreamTableName, upstream)
if err != nil {
return err
}
return nil
}
// Delete deletes an upstream by it's name or ID.
func (k *UpstreamsCollection) Delete(nameOrID string) error {
if nameOrID == "" {
return errIDRequired
}
txn := k.db.Txn(true)
defer txn.Abort()
err := deleteUpstream(txn, nameOrID)
if err != nil {
return err
}
txn.Commit()
return nil
}
// GetAll gets all upstreams in the state.
func (k *UpstreamsCollection) GetAll() ([]*Upstream, error) {
txn := k.db.Txn(false)
defer txn.Abort()
iter, err := txn.Get(upstreamTableName, all, true)
if err != nil {
return nil, err
}
var res []*Upstream
for el := iter.Next(); el != nil; el = iter.Next() {
u, ok := el.(*Upstream)
if !ok {
panic(unexpectedType)
}
res = append(res, &Upstream{Upstream: *u.DeepCopy()})
}
txn.Commit()
return res, nil
}
|
