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|
package analyzer
import (
"context"
"log/slog"
"time"
"github.com/ansg191/ibd-trader/backend/internal/analyzer"
"github.com/ansg191/ibd-trader/backend/internal/database"
"github.com/ansg191/ibd-trader/backend/internal/redis/taskqueue"
"github.com/redis/go-redis/v9"
)
const (
Queue = "analyzer"
QueueEncoding = taskqueue.EncodingJSON
lockTimeout = 1 * time.Minute
dequeueTimeout = 5 * time.Second
)
func RunAnalyzer(
ctx context.Context,
redis *redis.Client,
analyzer analyzer.Analyzer,
db database.Executor,
name string,
) error {
queue, err := taskqueue.New(
ctx,
redis,
Queue,
name,
taskqueue.WithEncoding[TaskInfo](QueueEncoding),
)
if err != nil {
return err
}
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
waitForTask(ctx, queue, analyzer, db)
}
}
}
func waitForTask(
ctx context.Context,
queue taskqueue.TaskQueue[TaskInfo],
analyzer analyzer.Analyzer,
db database.Executor,
) {
task, err := queue.Dequeue(ctx, lockTimeout, dequeueTimeout)
if err != nil {
slog.ErrorContext(ctx, "Failed to dequeue task", "error", err)
return
}
if task == nil {
// No task available.
return
}
errCh := make(chan error)
resCh := make(chan string)
defer close(errCh)
defer close(resCh)
go func() {
res, err := analyzeStock(ctx, analyzer, db, task.Data.ID)
if err != nil {
errCh <- err
return
}
resCh <- res
}()
ticker := time.NewTicker(lockTimeout / 5)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
// Context was canceled. Return early.
return
case <-ticker.C:
// Extend the lock periodically.
func() {
ctx, cancel := context.WithTimeout(ctx, lockTimeout/5)
defer cancel()
err := queue.Extend(ctx, task.ID)
if err != nil {
slog.ErrorContext(ctx, "Failed to extend lock", "error", err)
}
}()
case err = <-errCh:
// analyzeStock has errored.
slog.ErrorContext(ctx, "Failed to analyze", "error", err)
_, err = queue.Return(ctx, task.ID, err)
if err != nil {
slog.ErrorContext(ctx, "Failed to return task", "error", err)
return
}
return
case res := <-resCh:
// analyzeStock has completed successfully.
slog.DebugContext(ctx, "Analyzed ID", "id", task.Data.ID, "result", res)
err = queue.Complete(ctx, task.ID, res)
if err != nil {
slog.ErrorContext(ctx, "Failed to complete task", "error", err)
return
}
return
}
}
}
func analyzeStock(ctx context.Context, a analyzer.Analyzer, db database.Executor, id string) (string, error) {
info, err := database.GetStockInfo(ctx, db, id)
if err != nil {
return "", err
}
analysis, err := a.Analyze(
ctx,
info.Symbol,
info.Price,
info.ChartAnalysis,
)
if err != nil {
return "", err
}
return database.AddAnalysis(ctx, db, id, analysis)
}
type TaskInfo struct {
ID string `json:"id"`
}
|
