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scheduler.go
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scheduler.go
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package scheduler
import (
"fmt"
"log"
"os"
"github.com/nathanthorell/dba-agent/src/config"
"github.com/nathanthorell/dba-agent/src/db"
"github.com/robfig/cron/v3"
)
// Scheduler struct represents the scheduler
type Scheduler struct {
config config.Config
scheduler *cron.Cron
}
// NewScheduler creates a new scheduler
func NewScheduler(config config.Config) *Scheduler {
return &Scheduler{
config: config,
scheduler: cron.New(),
}
}
func (s *Scheduler) getServerByName(serverName string) (config.ServerConfig, error) {
for _, server := range s.config.DBServers {
if server.Name == serverName {
return server, nil
}
}
return config.ServerConfig{}, fmt.Errorf("server not found: %s", serverName)
}
func (s *Scheduler) Start() {
log.Printf("Scheduler started")
for _, query := range s.config.DBQueries {
// Get server configuration
server, err := s.getServerByName(query.Server)
if err != nil {
log.Printf("Error getting server config for query %s: %v", query.Name, err)
continue
}
// Schedule task to execute query
_, err = s.scheduler.AddFunc(query.Schedule, func() {
connectionString := os.Getenv(server.ConnectionStringVar)
if connectionString == "" {
log.Printf("Empty connection string for server %s", server.Name)
return
}
db, err := db.NewDBConnection(connectionString)
if err != nil {
log.Printf("Error connecting to database for query %s: %v", query.Name, err)
return
}
defer db.Close()
// Execute query
_, err = db.Exec(query.Query)
if err != nil {
log.Printf("Error executing query %s: %v", query.Name, err)
}
})
if err != nil {
log.Printf("Error scheduling task for query %s: %v", query.Name, err)
}
}
s.scheduler.Start()
}