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sql.go
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sql.go
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package services
import (
"database/sql"
"errors"
"fmt"
"log"
"net"
"strconv"
"strings"
"time"
"github.com/ScoreTrak/ScoreTrak/pkg/exec"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
type SQL struct {
Username string
Password string
Port string
DBType string
DBName string
Command string
MinExpectedRows string
MaxExpectedRows string
}
func NewSQL() *SQL {
return &SQL{}
}
var ErrSQLRequiresCommand = errors.New("sql check needs a command parameter")
var ErrUnsupportedDBType = errors.New("DBType should either be mysql, or postgres")
var ErrSQLNeedsUsernameOrPassword = errors.New("sql check_service needs username, and password")
func (w *SQL) Validate() error {
if w.Password == "" || w.Username == "" {
return ErrSQLNeedsUsernameOrPassword
}
if strings.ToLower(w.DBType) != "mysql" && strings.ToLower(w.DBType) != "postgres" {
return ErrUnsupportedDBType
}
if w.Command == "" {
return ErrSQLRequiresCommand
}
if w.MaxExpectedRows != "" {
_, err := strconv.ParseUint(w.MaxExpectedRows, 10, 64)
if err != nil {
return err
}
}
if w.MinExpectedRows != "" {
_, err := strconv.ParseUint(w.MinExpectedRows, 10, 64)
if err != nil {
return err
}
}
return nil
}
func (w *SQL) setupDB(e exec.Exec) (*gorm.DB, error) {
var db *gorm.DB
var err error
if w.DBType == "mysql" {
if w.Port == "" {
w.Port = "3306"
}
err = tcpPortDial(net.JoinHostPort(e.Host, w.Port), time.Until(e.Deadline())/3)
if err != nil {
return nil, err
}
var dsn string
if w.DBName != "" {
dsn = fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local", w.Username, w.Password, e.Host, w.Port, w.DBName)
} else {
dsn = fmt.Sprintf("%s:%s@tcp(%s:%s)", w.Username, w.Password, e.Host, w.Port)
}
db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
return nil, fmt.Errorf("unable to initialize mysql client: %w", err)
}
}
if w.DBType == "postgres" {
if w.Port == "" {
w.Port = "5432"
}
err = tcpPortDial(net.JoinHostPort(e.Host, w.Port), time.Until(e.Deadline())/3)
if err != nil {
return nil, err
}
var dsn string
if w.DBName != "" {
dsn = fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable",
e.Host,
w.Port,
w.Username,
w.Password,
w.DBName)
} else {
dsn = fmt.Sprintf("host=%s port=%s user=%s password=%s sslmode=disable",
e.Host,
w.Port,
w.Username,
w.Password)
}
db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
return nil, fmt.Errorf("unable to initialize postgres client: %w", err)
}
}
return db, nil
}
func (w *SQL) Execute(e exec.Exec) (passed bool, logOutput string, err error) {
db, err := w.setupDB(e)
if err != nil {
return false, "", err
}
sqlDB, err := db.DB()
if err != nil {
return false, "", fmt.Errorf("unable to fetch the underlying sql driver, this is most likely a bug: %w", err)
}
defer func(sqlDB *sql.DB) {
err := sqlDB.Close()
if err != nil {
log.Println(fmt.Errorf("unable to close sql connection: %w", err))
}
}(sqlDB)
result := db.WithContext(e.Context).Raw(w.Command)
if result.Error != nil {
return false, "", fmt.Errorf("unable to execute the provided command: %w", result.Error)
}
rows, err := result.Rows()
defer func(rows *sql.Rows) {
if rows != nil {
err := rows.Close()
if err != nil {
log.Println(fmt.Errorf("failed to close rows: %w", err))
}
}
}(rows)
if err != nil {
return false, "", fmt.Errorf("encountered a problem when retrieving rows: %w", err)
}
if rows.Err() != nil {
return false, "", fmt.Errorf("encountered a problem during row iteration: %w", err)
}
var count int64
for rows.Next() {
count++
}
if w.MaxExpectedRows != "" {
num, _ := strconv.ParseInt(w.MaxExpectedRows, 10, 64)
if num < count {
return false, "", fmt.Errorf("%w (%d < %d)", ErrNumberOfRowsMoreThanExpected, num, count)
}
}
if w.MinExpectedRows != "" {
num, _ := strconv.ParseInt(w.MinExpectedRows, 10, 64)
if num > count {
return false, "", fmt.Errorf("%w: (%d > %d)", ErrNumberOfRowsLessThanExpected, num, count)
}
}
return true, Success, nil
}
var ErrNumberOfRowsLessThanExpected = errors.New("number of rows was less than expected")
var ErrNumberOfRowsMoreThanExpected = errors.New("number of rows was more than expected")
// Todo: Implement Content Check