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628 lines
12 KiB
Go
628 lines
12 KiB
Go
package mysql
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import (
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"bytes"
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"context"
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"database/sql"
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"encoding/json"
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"fmt"
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"net/url"
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"github.com/Sirupsen/logrus"
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"github.com/go-sql-driver/mysql"
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_ "github.com/go-sql-driver/mysql"
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"gitlab.oracledx.com/odx/functions/api/datastore/internal/datastoreutil"
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"gitlab.oracledx.com/odx/functions/api/models"
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)
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const routesTableCreate = `CREATE TABLE IF NOT EXISTS routes (
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app_name varchar(256) NOT NULL,
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path varchar(256) NOT NULL,
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image varchar(256) NOT NULL,
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format varchar(16) NOT NULL,
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maxc int NOT NULL,
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memory int NOT NULL,
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timeout int NOT NULL,
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idle_timeout int NOT NULL,
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type varchar(16) NOT NULL,
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headers text NOT NULL,
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config text NOT NULL,
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PRIMARY KEY (app_name, path)
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);`
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const appsTableCreate = `CREATE TABLE IF NOT EXISTS apps (
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name varchar(256) NOT NULL PRIMARY KEY,
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config text NOT NULL
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);`
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const extrasTableCreate = `CREATE TABLE IF NOT EXISTS extras (
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id varchar(256) NOT NULL PRIMARY KEY,
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value varchar(256) NOT NULL
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);`
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const routeSelector = `SELECT app_name, path, image, format, maxc, memory, type, timeout, idle_timeout, headers, config FROM routes`
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type rowScanner interface {
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Scan(dest ...interface{}) error
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}
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type rowQuerier interface {
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QueryRow(query string, args ...interface{}) *sql.Row
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}
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/*
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MySQLDatastore defines a basic MySQL Datastore struct.
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*/
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type MySQLDatastore struct {
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db *sql.DB
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}
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/*
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New creates a new MySQL Datastore.
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*/
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func New(url *url.URL) (models.Datastore, error) {
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u := fmt.Sprintf("%s@%s%s", url.User.String(), url.Host, url.Path)
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db, err := sql.Open("mysql", u)
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if err != nil {
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return nil, err
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}
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err = db.Ping()
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if err != nil {
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return nil, err
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}
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maxIdleConns := 30
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db.SetMaxIdleConns(maxIdleConns)
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logrus.WithFields(logrus.Fields{"max_idle_connections": maxIdleConns}).Info("MySQL dialed")
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pg := &MySQLDatastore{
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db: db,
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}
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for _, v := range []string{routesTableCreate, appsTableCreate, extrasTableCreate} {
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_, err = db.Exec(v)
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if err != nil {
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return nil, err
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}
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}
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return datastoreutil.NewValidator(pg), nil
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}
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/*
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InsertApp inserts an app to MySQL.
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*/
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func (ds *MySQLDatastore) InsertApp(ctx context.Context, app *models.App) (*models.App, error) {
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var cbyte []byte
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var err error
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if app.Config != nil {
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cbyte, err = json.Marshal(app.Config)
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if err != nil {
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return nil, err
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}
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}
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stmt, err := ds.db.Prepare("INSERT apps SET name=?,config=?")
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if err != nil {
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return nil, err
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}
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_, err = stmt.Exec(app.Name, string(cbyte))
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if err != nil {
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mysqlErr := err.(*mysql.MySQLError)
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if mysqlErr.Number == 1062 {
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return nil, models.ErrAppsAlreadyExists
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}
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return nil, err
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}
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return app, nil
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}
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/*
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UpdateApp updates an existing app on MySQL.
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*/
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func (ds *MySQLDatastore) UpdateApp(ctx context.Context, newapp *models.App) (*models.App, error) {
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app := &models.App{Name: newapp.Name}
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err := ds.Tx(func(tx *sql.Tx) error {
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row := ds.db.QueryRow(`SELECT config FROM apps WHERE name=?`, app.Name)
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var config string
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if err := row.Scan(&config); err != nil {
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if err == sql.ErrNoRows {
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return models.ErrAppsNotFound
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}
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return err
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}
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if config != "" {
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err := json.Unmarshal([]byte(config), &app.Config)
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if err != nil {
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return err
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}
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}
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app.UpdateConfig(newapp.Config)
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cbyte, err := json.Marshal(app.Config)
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if err != nil {
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return err
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}
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stmt, err := ds.db.Prepare(`UPDATE apps SET config=? WHERE name=?`)
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if err != nil {
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return err
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}
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res, err := stmt.Exec(string(cbyte), app.Name)
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if err != nil {
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return err
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}
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if n, err := res.RowsAffected(); err != nil {
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return err
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} else if n == 0 {
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return models.ErrAppsNotFound
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return app, nil
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}
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/*
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RemoveApp removes an existing app on MySQL.
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*/
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func (ds *MySQLDatastore) RemoveApp(ctx context.Context, appName string) error {
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_, err := ds.db.Exec(`
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DELETE FROM apps
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WHERE name = ?
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`, appName)
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if err != nil {
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return err
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}
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return nil
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}
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/*
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GetApp retrieves an app from MySQL.
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*/
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func (ds *MySQLDatastore) GetApp(ctx context.Context, name string) (*models.App, error) {
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row := ds.db.QueryRow(`SELECT name, config FROM apps WHERE name=?`, name)
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var resName string
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var config string
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err := row.Scan(&resName, &config)
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res := &models.App{
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Name: resName,
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}
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json.Unmarshal([]byte(config), &res.Config)
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if err != nil {
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if err == sql.ErrNoRows {
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return nil, models.ErrAppsNotFound
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}
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return nil, err
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}
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return res, nil
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}
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func scanApp(scanner rowScanner, app *models.App) error {
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var configStr string
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err := scanner.Scan(
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&app.Name,
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&configStr,
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)
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json.Unmarshal([]byte(configStr), &app.Config)
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return err
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}
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/*
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GetApps retrieves an array of apps according to a specific filter.
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*/
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func (ds *MySQLDatastore) GetApps(ctx context.Context, filter *models.AppFilter) ([]*models.App, error) {
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res := []*models.App{}
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filterQuery, args := buildFilterAppQuery(filter)
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rows, err := ds.db.Query(fmt.Sprintf("SELECT DISTINCT name, config FROM apps %s", filterQuery), args...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var app models.App
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err := scanApp(rows, &app)
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if err != nil {
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break
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}
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res = append(res, &app)
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}
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if err := rows.Err(); err != nil {
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return res, err
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}
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return res, nil
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}
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/*
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InsertRoute inserts an route to MySQL.
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*/
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func (ds *MySQLDatastore) InsertRoute(ctx context.Context, route *models.Route) (*models.Route, error) {
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hbyte, err := json.Marshal(route.Headers)
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if err != nil {
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return nil, err
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}
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cbyte, err := json.Marshal(route.Config)
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if err != nil {
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return nil, err
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}
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err = ds.Tx(func(tx *sql.Tx) error {
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r := tx.QueryRow(`SELECT 1 FROM apps WHERE name=?`, route.AppName)
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if err := r.Scan(new(int)); err != nil {
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if err == sql.ErrNoRows {
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return models.ErrAppsNotFound
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}
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}
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same, err := tx.Query(`SELECT 1 FROM routes WHERE app_name=? AND path=?`,
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route.AppName, route.Path)
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if err != nil {
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return err
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}
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defer same.Close()
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if same.Next() {
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return models.ErrRoutesAlreadyExists
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}
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_, err = tx.Exec(`
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INSERT INTO routes (
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app_name,
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path,
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image,
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format,
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maxc,
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memory,
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type,
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timeout,
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idle_timeout,
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headers,
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config
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)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);`,
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route.AppName,
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route.Path,
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route.Image,
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route.Format,
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route.MaxConcurrency,
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route.Memory,
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route.Type,
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route.Timeout,
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route.IdleTimeout,
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string(hbyte),
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string(cbyte),
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)
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return err
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})
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if err != nil {
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return nil, err
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}
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return route, nil
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}
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/*
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UpdateRoute updates an existing route on MySQL.
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*/
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func (ds *MySQLDatastore) UpdateRoute(ctx context.Context, newroute *models.Route) (*models.Route, error) {
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var route models.Route
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err := ds.Tx(func(tx *sql.Tx) error {
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row := ds.db.QueryRow(fmt.Sprintf("%s WHERE app_name=? AND path=?", routeSelector), newroute.AppName, newroute.Path)
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if err := scanRoute(row, &route); err == sql.ErrNoRows {
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return models.ErrRoutesNotFound
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} else if err != nil {
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return err
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}
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route.Update(newroute)
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hbyte, err := json.Marshal(route.Headers)
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if err != nil {
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return err
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}
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cbyte, err := json.Marshal(route.Config)
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if err != nil {
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return err
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}
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res, err := tx.Exec(`
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UPDATE routes SET
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image = ?,
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format = ?,
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maxc = ?,
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memory = ?,
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type = ?,
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timeout = ?,
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idle_timeout = ?,
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headers = ?,
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config = ?
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WHERE app_name = ? AND path = ?;`,
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route.Image,
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route.Format,
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route.MaxConcurrency,
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route.Memory,
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route.Type,
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route.Timeout,
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route.IdleTimeout,
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string(hbyte),
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string(cbyte),
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route.AppName,
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route.Path,
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)
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if err != nil {
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return err
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}
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if n, err := res.RowsAffected(); err != nil {
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return err
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} else if n == 0 {
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return models.ErrRoutesNotFound
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return &route, nil
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}
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/*
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RemoveRoute removes an existing route on MySQL.
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*/
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func (ds *MySQLDatastore) RemoveRoute(ctx context.Context, appName, routePath string) error {
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res, err := ds.db.Exec(`
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DELETE FROM routes
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WHERE path = ? AND app_name = ?
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`, routePath, appName)
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if err != nil {
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return err
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}
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n, err := res.RowsAffected()
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if err != nil {
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return err
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}
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if n == 0 {
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return models.ErrRoutesRemoving
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}
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return nil
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}
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func scanRoute(scanner rowScanner, route *models.Route) error {
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var headerStr string
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var configStr string
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err := scanner.Scan(
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&route.AppName,
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&route.Path,
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&route.Image,
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&route.Format,
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&route.MaxConcurrency,
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&route.Memory,
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&route.Type,
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&route.Timeout,
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&route.IdleTimeout,
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&headerStr,
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&configStr,
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)
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if err != nil {
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return err
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}
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if headerStr == "" {
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return models.ErrRoutesNotFound
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}
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if err := json.Unmarshal([]byte(headerStr), &route.Headers); err != nil {
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return err
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}
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return json.Unmarshal([]byte(configStr), &route.Config)
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}
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/*
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GetRoute retrieves a route from MySQL.
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*/
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func (ds *MySQLDatastore) GetRoute(ctx context.Context, appName, routePath string) (*models.Route, error) {
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var route models.Route
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row := ds.db.QueryRow(fmt.Sprintf("%s WHERE app_name=? AND path=?", routeSelector), appName, routePath)
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err := scanRoute(row, &route)
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if err == sql.ErrNoRows {
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return nil, models.ErrRoutesNotFound
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} else if err != nil {
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return nil, err
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}
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return &route, nil
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}
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/*
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GetRoutes retrieves an array of routes according to a specific filter.
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*/
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func (ds *MySQLDatastore) GetRoutes(ctx context.Context, filter *models.RouteFilter) ([]*models.Route, error) {
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res := []*models.Route{}
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filterQuery, args := buildFilterRouteQuery(filter)
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rows, err := ds.db.Query(fmt.Sprintf("%s %s", routeSelector, filterQuery), args...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var route models.Route
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err := scanRoute(rows, &route)
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if err != nil {
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continue
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}
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res = append(res, &route)
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}
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if err := rows.Err(); err != nil {
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return nil, err
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}
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return res, nil
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}
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/*
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GetRoutesByApp retrieves a route with a specific app name.
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*/
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func (ds *MySQLDatastore) GetRoutesByApp(ctx context.Context, appName string, filter *models.RouteFilter) ([]*models.Route, error) {
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res := []*models.Route{}
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var filterQuery string
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var args []interface{}
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if filter == nil {
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filterQuery = "WHERE app_name = ?"
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args = []interface{}{appName}
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} else {
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filter.AppName = appName
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filterQuery, args = buildFilterRouteQuery(filter)
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}
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rows, err := ds.db.Query(fmt.Sprintf("%s %s", routeSelector, filterQuery), args...)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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for rows.Next() {
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var route models.Route
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err := scanRoute(rows, &route)
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if err != nil {
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continue
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}
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res = append(res, &route)
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}
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if err := rows.Err(); err != nil {
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return nil, err
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}
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return res, nil
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}
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func buildFilterAppQuery(filter *models.AppFilter) (string, []interface{}) {
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if filter == nil {
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return "", nil
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}
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if filter.Name != "" {
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return "WHERE name LIKE ?", []interface{}{filter.Name}
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}
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return "", nil
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}
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func buildFilterRouteQuery(filter *models.RouteFilter) (string, []interface{}) {
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if filter == nil {
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return "", nil
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}
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var b bytes.Buffer
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var args []interface{}
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where := func(colOp, val string) {
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if val != "" {
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args = append(args, val)
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if len(args) == 1 {
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fmt.Fprintf(&b, "WHERE %s ?", colOp)
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} else {
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fmt.Fprintf(&b, " AND %s ?", colOp)
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}
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}
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}
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where("path =", filter.Path)
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where("app_name =", filter.AppName)
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where("image =", filter.Image)
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return b.String(), args
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}
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/*
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Put inserts an extra into MySQL.
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*/
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func (ds *MySQLDatastore) Put(ctx context.Context, key, value []byte) error {
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_, err := ds.db.Exec(`
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INSERT INTO extras (
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id,
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value
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)
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VALUES (?, ?)
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ON DUPLICATE KEY UPDATE
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value = ?
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`, string(key), string(value), string(value))
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if err != nil {
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return err
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}
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return nil
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}
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/*
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Get retrieves the value of a specific extra from MySQL.
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*/
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func (ds *MySQLDatastore) Get(ctx context.Context, key []byte) ([]byte, error) {
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row := ds.db.QueryRow("SELECT value FROM extras WHERE id=?", key)
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var value string
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err := row.Scan(&value)
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if err == sql.ErrNoRows {
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return nil, nil
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} else if err != nil {
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return nil, err
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}
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return []byte(value), nil
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}
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/*
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|
Tx Begins and commits a MySQL Transaction.
|
|
*/
|
|
func (ds *MySQLDatastore) Tx(f func(*sql.Tx) error) error {
|
|
tx, err := ds.db.Begin()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = f(tx)
|
|
if err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
return tx.Commit()
|
|
}
|