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pipeline_storage.go
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/
pipeline_storage.go
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// Copyright 2017 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"bytes"
"crypto/sha256"
"database/sql"
"errors"
"fmt"
"github.com/satori/go.uuid"
"github.com/uber-go/zap"
)
func (p *pipeline) fetchStorageData(r scanner) (*TStorageData_StorageData, error) {
var userID []byte
var bucket sql.NullString
var collection sql.NullString
var record sql.NullString
var value []byte
var version []byte
var read sql.NullInt64
var write sql.NullInt64
var createdAt sql.NullInt64
var updatedAt sql.NullInt64
var expiresAt sql.NullInt64
err := r.Scan(&userID, &bucket, &collection, &record,
&value, &version, &read, &write,
&createdAt, &updatedAt, &expiresAt)
if err != nil {
return &TStorageData_StorageData{}, err
}
return &TStorageData_StorageData{
Bucket: bucket.String,
Collection: collection.String,
Record: record.String,
UserId: userID,
Value: value,
Version: version,
PermissionRead: read.Int64,
PermissionWrite: write.Int64,
CreatedAt: createdAt.Int64,
UpdatedAt: updatedAt.Int64,
ExpiresAt: expiresAt.Int64,
}, nil
}
func (p *pipeline) storageFetch(logger zap.Logger, session *session, envelope *Envelope) {
incoming := envelope.GetStorageFetch()
storageData := make([]*TStorageData_StorageData, 0)
for _, key := range incoming.Keys {
if key.Bucket == "" || key.Collection == "" || key.Record == "" {
logger.Error("Invalid values for Bucket or Collection or Record")
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: "Invalid values for Bucket or Collection or Record"}}})
return
}
if len(key.UserId) != 0 {
userID, err := uuid.FromBytes(key.UserId)
if err != nil {
logger.Error("Invalid User ID")
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: "Invalid User ID"}}})
return
}
if userID.String() != session.userID.String() {
logger.Error("Not allowed to fetch from storage of a different user")
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: "Not allowed to fetch from storage of a different user"}}})
return
}
}
var row *sql.Row
if len(key.UserId) == 0 {
query := `
SELECT user_id, bucket, collection, record,
value, version, read, write,
created_at, updated_at, expires_at
FROM storage
WHERE bucket = $1 AND collection = $2 AND record = $4 AND user_id IS NULL AND deleted_at = 0 AND read = 1`
row = p.db.QueryRow(query, key.Bucket, key.Collection, key.Record)
} else {
query := `
SELECT user_id, bucket, collection, record,
value, version, read, write,
created_at, updated_at, expires_at
FROM storage
WHERE bucket = $1 AND collection = $2 AND user_id = $3 AND record = $4 AND deleted_at = 0 AND read = 1`
row = p.db.QueryRow(query, key.Bucket, key.Collection, session.userID.Bytes(), key.Record)
}
data, err := p.fetchStorageData(row)
if err != nil {
logger.Error("Could not fetch from storage",
zap.Error(err),
zap.String("bucket", key.Bucket),
zap.String("collection", key.Collection),
zap.String("record", key.Record))
} else {
storageData = append(storageData, data)
}
}
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_StorageData{StorageData: &TStorageData{Data: storageData}}})
}
func (p *pipeline) storageWrite(logger zap.Logger, session *session, envelope *Envelope) {
incoming := envelope.GetStorageWrite()
tx, err := p.db.Begin()
if err != nil {
logger.Error("Could not store data", zap.Error(err))
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: "Could not store data"}}})
return
}
response := make([]*TStorageKey_StorageKey, 0)
errorMessage := "Could not store data"
defer func() {
if err != nil {
logger.Error("Could not store data", zap.Error(err))
err = tx.Rollback()
if err != nil {
logger.Error("Could not rollback transaction", zap.Error(err))
}
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: errorMessage}}})
} else {
err = tx.Commit()
if err != nil {
logger.Error("Could not commit transaction", zap.Error(err))
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: errorMessage}}})
} else {
logger.Info("Stored data successfully")
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_StorageKey{StorageKey: &TStorageKey{Keys: response}}})
}
}
}()
updatedAt := nowMs()
for _, data := range incoming.Data {
if data.Bucket == "" {
errorMessage = "Bucket value is empty"
err = errors.New(errorMessage)
return
} else if data.Collection == "" {
errorMessage = "Collection value is empty"
err = errors.New(errorMessage)
return
} else if data.Record == "" {
errorMessage = "Record value is empty"
err = errors.New(errorMessage)
return
}
recordID := uuid.NewV4().Bytes()
sha := fmt.Sprintf("%x", sha256.Sum256(data.Value))
version := []byte(sha)
query := ""
params := []interface{}{}
if len(data.Version) == 0 {
query = `
INSERT INTO storage (id, user_id, bucket, collection, record, value, version, created_at, updated_at, deleted_at)
SELECT $1, $2, $3, $4, $5, $6, $7, $8, $8, 0
WHERE NOT EXISTS (SELECT record FROM storage WHERE user_id = $2 AND bucket = $3 AND collection = $4 AND record = $5 AND deleted_at = 0 AND write = 0)
ON CONFLICT (bucket, collection, user_id, record, deleted_at)
DO UPDATE SET value = $6, version = $7, updated_at = $8
`
params = []interface{}{recordID, session.userID.Bytes(), data.Bucket, data.Collection, data.Record, data.Value, version, updatedAt}
errorMessage = "Could not store data"
} else if bytes.Equal(data.Version, []byte("*")) {
// if-none-match
query = `
INSERT INTO storage (id, user_id, bucket, collection, record, value, version, created_at, updated_at, deleted_at)
SELECT $1, $2, $3, $4, $5, $6, $7, $8, $8, 0
WHERE NOT EXISTS (SELECT record FROM storage WHERE user_id = $2 AND bucket = $3 AND collection = $4 AND record = $5 AND deleted_at = 0)
`
params = []interface{}{recordID, session.userID.Bytes(), data.Bucket, data.Collection, data.Record, data.Value, version, updatedAt}
errorMessage = "Could not store data. This could be caused by failure of if-none-match version check"
} else {
// if-match
query = `
INSERT INTO storage (id, user_id, bucket, collection, record, value, version, created_at, updated_at, deleted_at)
SELECT $1, $2, $3, $4, $5, $6, $7, $8, $8, 0
WHERE EXISTS (SELECT record FROM storage WHERE user_id = $2 AND bucket = $3 AND collection = $4 and record = $5 AND version = $9 AND deleted_at = 0 AND write = 1)
ON CONFLICT (bucket, collection, user_id, record, deleted_at)
DO UPDATE SET value = $6, version = $7, updated_at = $8
`
params = []interface{}{recordID, session.userID.Bytes(), data.Bucket, data.Collection, data.Record, data.Value, version, updatedAt, data.Version}
errorMessage = "Could not store data. This could be caused by failure of if-match version check"
}
_, err = tx.Exec(query, params...)
if err != nil {
return
}
response = append(response, &TStorageKey_StorageKey{
Bucket: data.Bucket,
Collection: data.Collection,
Record: data.Record,
Version: version[:],
})
}
}
func (p *pipeline) storageRemove(logger zap.Logger, session *session, envelope *Envelope) {
incoming := envelope.GetStorageRemove()
tx, err := p.db.Begin()
if err != nil {
logger.Error("Could not store data", zap.Error(err))
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: "Could not store data"}}})
return
}
errorMessage := "Could not remove data"
defer func() {
if err != nil {
logger.Error("Could not remove data", zap.Error(err))
err = tx.Rollback()
if err != nil {
logger.Error("Could not rollback transaction", zap.Error(err))
}
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: errorMessage}}})
} else {
err = tx.Commit()
if err != nil {
logger.Error("Could not commit transaction", zap.Error(err))
session.Send(&Envelope{CollationId: envelope.CollationId, Payload: &Envelope_Error{&Error{Reason: errorMessage}}})
} else {
logger.Info("Removed data successfully")
session.Send(&Envelope{CollationId: envelope.CollationId})
}
}
}()
updatedAt := nowMs()
for _, key := range incoming.Keys {
var res sql.Result
if key.Bucket == "" {
errorMessage = "Bucket value is empty"
err = errors.New(errorMessage)
return
} else if key.Collection == "" {
errorMessage = "Collection value is empty"
err = errors.New(errorMessage)
return
} else if key.Record == "" {
errorMessage = "Record value is empty"
err = errors.New(errorMessage)
return
}
if key.Version != nil {
query := `
UPDATE storage SET deleted_at = $1, updated_at = $1
WHERE bucket = $2 AND collection = $3 AND record = $4 AND user_id = $5 AND version = $6 AND deleted_at = 0 AND write = 1`
res, err = tx.Exec(query, updatedAt, key.Bucket, key.Collection, key.Record, session.userID.Bytes(), key.Version)
} else {
query := `
UPDATE storage SET deleted_at = $1, updated_at = $1
WHERE bucket = $2 AND collection = $3 AND record = $4 AND user_id = $5 AND deleted_at = 0 AND write = 1`
res, err = tx.Exec(query, updatedAt, key.Bucket, key.Collection, key.Record, session.userID.Bytes())
}
if err != nil {
return
}
rowsAffected, _ := res.RowsAffected()
logger.Info("Soft deleted record sent as part of an uncommitted transaction",
zap.Int64("count", rowsAffected),
zap.String("bucket", key.Bucket),
zap.String("collection", key.Collection),
zap.String("record", key.Record),
zap.String("version", string(key.Version)))
}
session.Send(&Envelope{CollationId: envelope.CollationId})
}