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package scrape
import (
"context"
"errors"
"log/slog"
"time"
"github.com/ansg191/ibd-trader/backend/internal/database"
"github.com/ansg191/ibd-trader/backend/internal/ibd"
"github.com/ansg191/ibd-trader/backend/internal/redis/taskqueue"
"github.com/redis/go-redis/v9"
"github.com/robfig/cron/v3"
)
const (
Queue = "scrape-queue"
QueueEncoding = taskqueue.EncodingJSON
Channel = "scrape-channel"
)
// Manager is responsible for sending scraping tasks to the workers.
type Manager struct {
client *ibd.Client
db database.Executor
queue taskqueue.TaskQueue[TaskInfo]
schedule cron.Schedule
pubsub *redis.PubSub
}
func New(
ctx context.Context,
client *ibd.Client,
db database.Executor,
redis *redis.Client,
schedule cron.Schedule,
) (*Manager, error) {
queue, err := taskqueue.New(
ctx,
redis,
Queue,
"ibd-manager",
taskqueue.WithEncoding[TaskInfo](QueueEncoding),
)
if err != nil {
return nil, err
}
return &Manager{
client: client,
db: db,
queue: queue,
schedule: schedule,
pubsub: redis.Subscribe(ctx, Channel),
}, nil
}
func (m *Manager) Close() error {
return m.pubsub.Close()
}
func (m *Manager) Run(ctx context.Context) {
ch := m.pubsub.Channel()
for {
now := time.Now()
// Find the next time
nextTime := m.schedule.Next(now)
if nextTime.IsZero() {
// Sleep until the next day
time.Sleep(time.Until(now.AddDate(0, 0, 1)))
continue
}
timer := time.NewTimer(nextTime.Sub(now))
slog.DebugContext(ctx, "waiting for next IBD50 scrape", "next_exec", nextTime)
select {
case <-timer.C:
nextExec := m.schedule.Next(nextTime)
m.scrapeIBD50(ctx, nextExec)
case <-ch:
nextExec := m.schedule.Next(time.Now())
m.scrapeIBD50(ctx, nextExec)
case <-ctx.Done():
if !timer.Stop() {
<-timer.C
}
return
}
}
}
func (m *Manager) scrapeIBD50(ctx context.Context, deadline time.Time) {
ctx, cancel := context.WithDeadline(ctx, deadline)
defer cancel()
stocks, err := m.client.GetIBD50(ctx)
if err != nil {
if errors.Is(err, ibd.ErrNoAvailableCookies) {
slog.WarnContext(ctx, "no available cookies", "error", err)
return
}
slog.ErrorContext(ctx, "failed to get IBD50", "error", err)
return
}
for _, stock := range stocks {
// Add stock to DB
err = database.AddStock(ctx, m.db, database.Stock{
Symbol: stock.Symbol,
Name: stock.Name,
IBDUrl: stock.QuoteURL.String(),
})
if err != nil {
slog.ErrorContext(ctx, "failed to add stock", "error", err)
continue
}
// Add ranking to Db
err = database.AddRanking(ctx, m.db, stock.Symbol, int(stock.Rank), 0)
if err != nil {
slog.ErrorContext(ctx, "failed to add ranking", "error", err)
continue
}
// Add scrape task to queue
task := TaskInfo{Symbol: stock.Symbol}
taskID, err := m.queue.Enqueue(ctx, task)
if err != nil {
slog.ErrorContext(ctx, "failed to enqueue task", "error", err)
}
slog.DebugContext(ctx, "enqueued scrape task", "task_id", taskID, "symbol", stock.Symbol)
}
}
type TaskInfo struct {
Symbol string `json:"symbol"`
}
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