Initial Commit

4 files changed, 703 insertions, 0 deletions

diff --git a/backend/internal/worker/analyzer/analyzer.go b/backend/internal/worker/analyzer/analyzer.go
new file mode 100644
index 0000000..924e571
--- /dev/null
+++ b/backend/internal/worker/analyzer/analyzer.go
@@ -0,0 +1,135 @@
+package analyzer
+
+import (
+	"context"
+	"log/slog"
+	"time"
+
+	"ibd-trader/internal/analyzer"
+	"ibd-trader/internal/database"
+	"ibd-trader/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.StockStore,
+	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.StockStore,
+) {
+	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
+	}
+
+	ch := make(chan error)
+	defer close(ch)
+	go func() {
+		ch <- analyzeStock(ctx, analyzer, db, task.Data.ID)
+	}()
+
+	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 = <-ch:
+			// scrapeUrl has completed.
+			if err != nil {
+				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
+				}
+			} else {
+				slog.DebugContext(ctx, "Analyzed ID", "id", task.Data.ID)
+				err = queue.Complete(ctx, task.ID, nil)
+				if err != nil {
+					slog.ErrorContext(ctx, "Failed to complete task", "error", err)
+					return
+				}
+			}
+			return
+		}
+	}
+}
+
+func analyzeStock(ctx context.Context, a analyzer.Analyzer, db database.StockStore, id string) error {
+	info, err := db.GetStockInfo(ctx, id)
+	if err != nil {
+		return err
+	}
+
+	analysis, err := a.Analyze(
+		ctx,
+		info.Symbol,
+		info.Price,
+		info.ChartAnalysis,
+	)
+	if err != nil {
+		return err
+	}
+
+	return db.AddAnalysis(ctx, id, analysis)
+}
+
+type TaskInfo struct {
+	ID string `json:"id"`
+}
diff --git a/backend/internal/worker/auth/auth.go b/backend/internal/worker/auth/auth.go
new file mode 100644
index 0000000..e1c6661
--- /dev/null
+++ b/backend/internal/worker/auth/auth.go
@@ -0,0 +1,228 @@
+package auth
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"ibd-trader/internal/database"
+	"ibd-trader/internal/ibd"
+	"ibd-trader/internal/leader/manager/ibd/auth"
+	"ibd-trader/internal/redis/taskqueue"
+
+	"github.com/redis/go-redis/v9"
+)
+
+const (
+	lockTimeout    = 1 * time.Minute
+	dequeueTimeout = 5 * time.Second
+)
+
+func RunAuthScraper(
+	ctx context.Context,
+	client *ibd.Client,
+	redis *redis.Client,
+	users database.UserStore,
+	cookies database.CookieStore,
+	name string,
+) error {
+	queue, err := taskqueue.New(
+		ctx,
+		redis,
+		auth.Queue,
+		name,
+		taskqueue.WithEncoding[auth.TaskInfo](auth.QueueEncoding),
+	)
+	if err != nil {
+		return err
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			waitForTask(ctx, queue, client, users, cookies)
+		}
+	}
+}
+
+func waitForTask(
+	ctx context.Context,
+	queue taskqueue.TaskQueue[auth.TaskInfo],
+	client *ibd.Client,
+	users database.UserStore,
+	cookies database.CookieStore,
+) {
+	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
+	}
+	slog.DebugContext(ctx, "Picked up auth task", "task", task.ID, "user", task.Data.UserSubject)
+
+	ch := make(chan error)
+	defer close(ch)
+	go func() {
+		ch <- scrapeCookies(ctx, client, users, cookies, task.Data.UserSubject)
+	}()
+
+	ticker := time.NewTicker(lockTimeout / 5)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			// The 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 = <-ch:
+			// scrapeCookies has completed.
+			if err != nil {
+				slog.ErrorContext(ctx, "Failed to scrape cookies", "error", err)
+				_, err = queue.Return(ctx, task.ID, err)
+				if err != nil {
+					slog.ErrorContext(ctx, "Failed to return task", "error", err)
+					return
+				}
+			} else {
+				err = queue.Complete(ctx, task.ID, nil)
+				if err != nil {
+					slog.ErrorContext(ctx, "Failed to complete task", "error", err)
+					return
+				}
+				slog.DebugContext(ctx, "Authenticated user", "user", task.Data.UserSubject)
+			}
+			return
+		}
+	}
+}
+
+func scrapeCookies(
+	ctx context.Context,
+	client *ibd.Client,
+	users database.UserStore,
+	store database.CookieStore,
+	user string,
+) error {
+	ctx, cancel := context.WithTimeout(ctx, lockTimeout)
+	defer cancel()
+
+	// Check if the user has valid cookies
+	done, err := hasValidCookies(ctx, store, user)
+	if err != nil {
+		return fmt.Errorf("failed to check cookies: %w", err)
+	}
+	if done {
+		return nil
+	}
+
+	// Health check degraded cookies
+	done, err = healthCheckDegradedCookies(ctx, client, store, user)
+	if err != nil {
+		return fmt.Errorf("failed to health check cookies: %w", err)
+	}
+	if done {
+		return nil
+	}
+
+	// No cookies are valid, so scrape new cookies
+	return scrapeNewCookies(ctx, client, users, store, user)
+}
+
+func hasValidCookies(ctx context.Context, store database.CookieStore, user string) (bool, error) {
+	// Check if the user has non-degraded cookies
+	cookies, err := store.GetCookies(ctx, user, false)
+	if err != nil {
+		return false, fmt.Errorf("failed to get non-degraded cookies: %w", err)
+	}
+
+	// If the user has non-degraded cookies, return true
+	if cookies != nil && len(cookies) > 0 {
+		return true, nil
+	}
+	return false, nil
+}
+
+func healthCheckDegradedCookies(
+	ctx context.Context,
+	client *ibd.Client,
+	store database.CookieStore,
+	user string,
+) (bool, error) {
+	// Check if the user has degraded cookies
+	cookies, err := store.GetCookies(ctx, user, true)
+	if err != nil {
+		return false, fmt.Errorf("failed to get degraded cookies: %w", err)
+	}
+
+	valid := false
+	for _, cookie := range cookies {
+		slog.DebugContext(ctx, "Health checking cookie", "cookie", cookie.ID)
+
+		// Health check the cookie
+		up, err := client.UserInfo(ctx, cookie.ToHTTPCookie())
+		if err != nil {
+			slog.ErrorContext(ctx, "Failed to health check cookie", "error", err)
+			continue
+		}
+
+		if up.Status != ibd.UserStatusSubscriber {
+			continue
+		}
+
+		// Cookie is valid
+		valid = true
+
+		// Update the cookie
+		err = store.RepairCookie(ctx, cookie.ID)
+		if err != nil {
+			slog.ErrorContext(ctx, "Failed to repair cookie", "error", err)
+		}
+	}
+
+	return valid, nil
+}
+
+func scrapeNewCookies(
+	ctx context.Context,
+	client *ibd.Client,
+	users database.UserStore,
+	store database.CookieStore,
+	user string,
+) error {
+	// Get the user's credentials
+	username, password, err := users.GetIBDCreds(ctx, user)
+	if err != nil {
+		return fmt.Errorf("failed to get IBD credentials: %w", err)
+	}
+
+	// Scrape the user's cookies
+	cookie, err := client.Authenticate(ctx, username, password)
+	if err != nil {
+		return fmt.Errorf("failed to authenticate user: %w", err)
+	}
+
+	// Store the cookie
+	err = store.AddCookie(ctx, user, cookie)
+	if err != nil {
+		return fmt.Errorf("failed to store cookie: %w", err)
+	}
+
+	return nil
+}
diff --git a/backend/internal/worker/scraper/scraper.go b/backend/internal/worker/scraper/scraper.go
new file mode 100644
index 0000000..a83d9ae
--- /dev/null
+++ b/backend/internal/worker/scraper/scraper.go
@@ -0,0 +1,191 @@
+package scraper
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"ibd-trader/internal/database"
+	"ibd-trader/internal/ibd"
+	"ibd-trader/internal/leader/manager/ibd/scrape"
+	"ibd-trader/internal/redis/taskqueue"
+	"ibd-trader/internal/worker/analyzer"
+
+	"github.com/redis/go-redis/v9"
+)
+
+const (
+	lockTimeout    = 1 * time.Minute
+	dequeueTimeout = 5 * time.Second
+)
+
+func RunScraper(
+	ctx context.Context,
+	redis *redis.Client,
+	client *ibd.Client,
+	store database.StockStore,
+	name string,
+) error {
+	queue, err := taskqueue.New(
+		ctx,
+		redis,
+		scrape.Queue,
+		name,
+		taskqueue.WithEncoding[scrape.TaskInfo](scrape.QueueEncoding),
+	)
+	if err != nil {
+		return err
+	}
+
+	aQueue, err := taskqueue.New(
+		ctx,
+		redis,
+		analyzer.Queue,
+		name,
+		taskqueue.WithEncoding[analyzer.TaskInfo](analyzer.QueueEncoding),
+	)
+	if err != nil {
+		return err
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			waitForTask(ctx, queue, aQueue, client, store)
+		}
+	}
+}
+
+func waitForTask(
+	ctx context.Context,
+	queue taskqueue.TaskQueue[scrape.TaskInfo],
+	aQueue taskqueue.TaskQueue[analyzer.TaskInfo],
+	client *ibd.Client,
+	store database.StockStore,
+) {
+	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
+	}
+
+	ch := make(chan error)
+	go func() {
+		defer close(ch)
+		ch <- scrapeUrl(ctx, client, store, aQueue, task.Data.Symbol)
+	}()
+
+	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 = <-ch:
+			// scrapeUrl has completed.
+			if err != nil {
+				slog.ErrorContext(ctx, "Failed to scrape URL", "error", err)
+				_, err = queue.Return(ctx, task.ID, err)
+				if err != nil {
+					slog.ErrorContext(ctx, "Failed to return task", "error", err)
+					return
+				}
+			} else {
+				slog.DebugContext(ctx, "Scraped URL", "symbol", task.Data.Symbol)
+				err = queue.Complete(ctx, task.ID, nil)
+				if err != nil {
+					slog.ErrorContext(ctx, "Failed to complete task", "error", err)
+					return
+				}
+			}
+			return
+		}
+	}
+}
+
+func scrapeUrl(
+	ctx context.Context,
+	client *ibd.Client,
+	store database.StockStore,
+	aQueue taskqueue.TaskQueue[analyzer.TaskInfo],
+	symbol string,
+) error {
+	ctx, cancel := context.WithTimeout(ctx, lockTimeout)
+	defer cancel()
+
+	stockUrl, err := getStockUrl(ctx, store, client, symbol)
+	if err != nil {
+		return fmt.Errorf("failed to get stock url: %w", err)
+	}
+
+	// Scrape the stock info.
+	info, err := client.StockInfo(ctx, stockUrl)
+	if err != nil {
+		return fmt.Errorf("failed to get stock info: %w", err)
+	}
+
+	// Add stock info to the database.
+	id, err := store.AddStockInfo(ctx, info)
+	if err != nil {
+		return fmt.Errorf("failed to add stock info: %w", err)
+	}
+
+	// Add the stock to the analyzer queue.
+	_, err = aQueue.Enqueue(ctx, analyzer.TaskInfo{ID: id})
+	if err != nil {
+		return fmt.Errorf("failed to enqueue analysis task: %w", err)
+	}
+
+	slog.DebugContext(ctx, "Added stock info", "id", id)
+
+	return nil
+}
+
+func getStockUrl(ctx context.Context, store database.StockStore, client *ibd.Client, symbol string) (string, error) {
+	// Get the stock from the database.
+	stock, err := store.GetStock(ctx, symbol)
+	if err == nil {
+		return stock.IBDUrl, nil
+	}
+	if !errors.Is(err, database.ErrStockNotFound) {
+		return "", fmt.Errorf("failed to get stock: %w", err)
+	}
+
+	// If stock isn't found in the database, get the stock from IBD.
+	stock, err = client.Search(ctx, symbol)
+	if errors.Is(err, ibd.ErrSymbolNotFound) {
+		return "", fmt.Errorf("symbol not found: %w", err)
+	}
+	if err != nil {
+		return "", fmt.Errorf("failed to search for symbol: %w", err)
+	}
+
+	// Add the stock to the database.
+	err = store.AddStock(ctx, stock)
+	if err != nil {
+		return "", fmt.Errorf("failed to add stock: %w", err)
+	}
+
+	return stock.IBDUrl, nil
+}
diff --git a/backend/internal/worker/worker.go b/backend/internal/worker/worker.go
new file mode 100644
index 0000000..5858115
--- /dev/null
+++ b/backend/internal/worker/worker.go
@@ -0,0 +1,149 @@
+package worker
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/base64"
+	"io"
+	"log/slog"
+	"os"
+	"time"
+
+	"ibd-trader/internal/analyzer"
+	"ibd-trader/internal/database"
+	"ibd-trader/internal/ibd"
+	"ibd-trader/internal/leader/manager"
+	analyzer2 "ibd-trader/internal/worker/analyzer"
+	"ibd-trader/internal/worker/auth"
+	"ibd-trader/internal/worker/scraper"
+
+	"github.com/redis/go-redis/v9"
+	"golang.org/x/sync/errgroup"
+)
+
+const (
+	HeartbeatInterval = 5 * time.Second
+	HeartbeatTTL      = 30 * time.Second
+)
+
+func StartWorker(
+	ctx context.Context,
+	ibdClient *ibd.Client,
+	client *redis.Client,
+	db database.Database,
+	a analyzer.Analyzer,
+) error {
+	// Get the worker name.
+	name, err := workerName()
+	if err != nil {
+		return err
+	}
+	slog.InfoContext(ctx, "Starting worker", "worker", name)
+
+	g, ctx := errgroup.WithContext(ctx)
+
+	g.Go(func() error {
+		return workerRegistrationLoop(ctx, client, name)
+	})
+	g.Go(func() error {
+		return scraper.RunScraper(ctx, client, ibdClient, db, name)
+	})
+	g.Go(func() error {
+		return auth.RunAuthScraper(ctx, ibdClient, client, db, db, name)
+	})
+	g.Go(func() error {
+		return analyzer2.RunAnalyzer(ctx, client, a, db, name)
+	})
+
+	return g.Wait()
+}
+
+func workerRegistrationLoop(ctx context.Context, client *redis.Client, name string) error {
+	sendHeartbeat(ctx, client, name)
+
+	ticker := time.NewTicker(HeartbeatInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			sendHeartbeat(ctx, client, name)
+		case <-ctx.Done():
+			removeWorker(ctx, client, name)
+			return ctx.Err()
+		}
+	}
+}
+
+// sendHeartbeat sends a heartbeat for the worker.
+// It ensures that the worker is in the active workers set and its heartbeat exists.
+func sendHeartbeat(ctx context.Context, client *redis.Client, name string) {
+	ctx, cancel := context.WithTimeout(ctx, HeartbeatInterval)
+	defer cancel()
+
+	// Add the worker to the active workers set.
+	if err := client.SAdd(ctx, manager.ActiveWorkersSet, name).Err(); err != nil {
+		slog.ErrorContext(ctx,
+			"Unable to add worker to active workers set",
+			"worker", name,
+			"error", err,
+		)
+		return
+	}
+
+	// Set the worker's heartbeat.
+	heartbeatKey := manager.WorkerHeartbeatKey(name)
+	if err := client.Set(ctx, heartbeatKey, time.Now().Unix(), HeartbeatTTL).Err(); err != nil {
+		slog.ErrorContext(ctx,
+			"Unable to set worker heartbeat",
+			"worker", name,
+			"error", err,
+		)
+		return
+	}
+}
+
+// removeWorker removes the worker from the active workers set.
+func removeWorker(ctx context.Context, client *redis.Client, name string) {
+	if ctx.Err() != nil {
+		// If the context is canceled, create a new uncanceled context.
+		ctx = context.WithoutCancel(ctx)
+	}
+	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+
+	// Remove the worker from the active workers set.
+	if err := client.SRem(ctx, manager.ActiveWorkersSet, name).Err(); err != nil {
+		slog.ErrorContext(ctx,
+			"Unable to remove worker from active workers set",
+			"worker", name,
+			"error", err,
+		)
+		return
+	}
+
+	// Remove the worker's heartbeat.
+	heartbeatKey := manager.WorkerHeartbeatKey(name)
+	if err := client.Del(ctx, heartbeatKey).Err(); err != nil {
+		slog.ErrorContext(ctx,
+			"Unable to remove worker heartbeat",
+			"worker", name,
+			"error", err,
+		)
+		return
+	}
+}
+
+func workerName() (string, error) {
+	hostname, err := os.Hostname()
+	if err != nil {
+		return "", err
+	}
+
+	bytes := make([]byte, 12)
+	if _, err = io.ReadFull(rand.Reader, bytes); err != nil {
+		return "", err
+	}
+
+	return hostname + "-" + base64.URLEncoding.EncodeToString(bytes), nil
+}