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mysql.go
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mysql.go
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// Copyright 2023 The PipeCD 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 mysql
import (
"context"
"database/sql"
"errors"
"fmt"
"os"
"strings"
"github.com/go-sql-driver/mysql"
"github.com/google/uuid"
"go.uber.org/zap"
"github.com/pipe-cd/pipecd/pkg/datastore"
)
const mysqlErrorCodeDuplicateEntry = 1062
// MySQL client wrapper
type MySQL struct {
client *sql.DB
logger *zap.Logger
usernameFile string
passwordFile string
}
// Option for create MySQL typed instance
type Option func(*MySQL)
// WithLogger returns logger setup function
func WithLogger(logger *zap.Logger) Option {
return func(m *MySQL) {
m.logger = logger
}
}
// WithAuthenticationFile returns auth info setup function
func WithAuthenticationFile(usernameFile, passwordFile string) Option {
return func(m *MySQL) {
m.usernameFile = usernameFile
m.passwordFile = passwordFile
}
}
// NewMySQL returns new MySQL instance
func NewMySQL(url, database string, opts ...Option) (*MySQL, error) {
m := &MySQL{
logger: zap.NewNop(),
}
for _, opt := range opts {
opt(m)
}
dataSourceName, err := BuildDataSourceName(url, database, m.usernameFile, m.passwordFile)
if err != nil {
return nil, err
}
db, err := sql.Open("mysql", dataSourceName)
if err != nil {
return nil, err
}
m.client = db
return m, nil
}
// Find implementation for MySQL
func (m *MySQL) Find(ctx context.Context, col datastore.Collection, opts datastore.ListOptions) (datastore.Iterator, error) {
kind := col.Kind()
if opts.Cursor != "" && len(opts.Orders) == 0 {
return nil, errors.New("opts.Cursor also requires Orders to be set")
}
query, err := buildFindQuery(kind, opts)
if err != nil {
m.logger.Error("failed to build find entities query",
zap.String("kind", kind),
zap.Error(err),
)
return nil, err
}
whereConditionVals := refineFiltersValue(opts.Filters)
cursorVals, err := makePaginationCursorValues(opts)
if err != nil {
return nil, err
}
whereConditionVals = append(whereConditionVals, cursorVals...)
rows, err := m.client.QueryContext(ctx, query, whereConditionVals...)
if err != nil {
m.logger.Error("failed to find entities",
zap.String("kind", kind),
zap.String("query", query),
zap.Any("whereConditionValues", whereConditionVals),
zap.Error(err),
)
return nil, err
}
return &Iterator{
rows: rows,
orders: opts.Orders,
}, nil
}
// Get implementation for MySQL
func (m *MySQL) Get(ctx context.Context, col datastore.Collection, id string, v interface{}) error {
kind := col.Kind()
row := m.client.QueryRowContext(ctx, buildGetQuery(kind), makeRowID(id))
var val string
err := row.Scan(&val)
if err == sql.ErrNoRows {
return datastore.ErrNotFound
}
if err != nil {
m.logger.Error("failed to get entity",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
return err
}
return decodeJSONValue(val, v)
}
// Create implementation for MySQL
func (m *MySQL) Create(ctx context.Context, col datastore.Collection, id string, entity interface{}) error {
kind := col.Kind()
stmt, err := m.client.PrepareContext(ctx, buildCreateQuery(kind))
if err != nil {
m.logger.Error("failed to create entity: failed to prepare query",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
return err
}
defer stmt.Close()
data, err := encodeJSONValue(entity)
if err != nil {
m.logger.Error("failed to create entity: failed to encode json data",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
return err
}
_, err = stmt.ExecContext(ctx, makeRowID(id), data)
if mysqlErr, ok := err.(*mysql.MySQLError); ok && mysqlErr.Number == mysqlErrorCodeDuplicateEntry {
return datastore.ErrAlreadyExists
}
if err != nil {
m.logger.Error("failed to create entity",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
return err
}
return nil
}
// Update implementation for MySQL
func (m *MySQL) Update(ctx context.Context, col datastore.Collection, id string, updater datastore.Updater) error {
kind := col.Kind()
// Start transaction with default isolation level.
tx, err := m.client.BeginTx(ctx, nil)
if err != nil {
m.logger.Error("failed to update entity: failed to start transaction",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
return err
}
row := tx.QueryRowContext(ctx, buildGetQuery(kind), makeRowID(id))
var val string
err = row.Scan(&val)
if err == sql.ErrNoRows {
tx.Rollback()
return datastore.ErrNotFound
}
if err != nil {
m.logger.Error("failed to update entity: failed to get entity",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
tx.Rollback()
return err
}
entity := col.Factory()()
if err := decodeJSONValue(val, entity); err != nil {
m.logger.Error("failed to update entity: failed to decode data",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
tx.Rollback()
return err
}
if err := updater(entity); err != nil {
m.logger.Error("failed to update entity: failed to apply updater",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
tx.Rollback()
return err
}
data, err := encodeJSONValue(entity)
if err != nil {
m.logger.Error("failed to update entity: failed to encode json data",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
tx.Rollback()
return err
}
_, err = tx.ExecContext(ctx, buildUpdateQuery(kind), data, makeRowID(id))
if err != nil {
m.logger.Error("failed to update entity",
zap.String("id", id),
zap.String("kind", kind),
zap.Error(err),
)
tx.Rollback()
return err
}
return tx.Commit()
}
// Close implementation for MySQL
func (m *MySQL) Close() error {
return m.client.Close()
}
// Ping implementation for MySQL
func (m *MySQL) Ping() error {
return m.client.Ping()
}
// BuildDataSourceName returns source name to make connection to database.
func BuildDataSourceName(url, database, usernameFile, passwordFile string) (string, error) {
if url == "" {
return "", fmt.Errorf("url is required field")
}
if database == "" {
if !strings.Contains(url, "/") {
return "", fmt.Errorf("database is not set")
}
return url, nil
}
// In case username and password files are not provided,
// those values may be included in the URL already so just return the given URL attached with Database name.
if usernameFile == "" || passwordFile == "" {
return fmt.Sprintf("%s/%s", url, database), nil
}
username, err := os.ReadFile(usernameFile)
if err != nil {
return "", fmt.Errorf("failed to read username file: %w", err)
}
password, err := os.ReadFile(passwordFile)
if err != nil {
return "", fmt.Errorf("failed to read password file: %w", err)
}
return fmt.Sprintf("%s:%s@tcp(%s)/%s", username, password, url, database), nil
}
// makeRowID converts a given string which not in UUID format to UUID string.
// Otherwise, return the id itself.
func makeRowID(id string) string {
_, err := uuid.Parse(id)
if err == nil {
return id
}
return uuid.NewSHA1(uuid.NameSpaceOID, []byte(id)).String()
}