Исходники и презентации

lessons/contexts/context_handling/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"context"
+	"time"
+)
+
+func Query(string) string
+
+func DoQeury(qyeryStr string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
+	defer cancel()
+
+	var resultCh chan string
+	go func() {
+		result := Query(qyeryStr)
+		resultCh <- result
+	}()
+
+	select {
+	case <-ctx.Done():
+		return "", ctx.Err()
+	case result := <-resultCh:
+		return result, nil
+	}
+}