Merge remote-tracking branch 'backend/main'

1 files changed, 97 insertions, 0 deletions

diff --git a/backend/internal/ibd/client.go b/backend/internal/ibd/client.go
new file mode 100644
index 0000000..c8575e3
--- /dev/null
+++ b/backend/internal/ibd/client.go
@@ -0,0 +1,97 @@
+package ibd
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"net/http"
+	"slices"
+
+	"github.com/ansg191/ibd-trader-backend/internal/database"
+	"github.com/ansg191/ibd-trader-backend/internal/ibd/transport"
+	"github.com/ansg191/ibd-trader-backend/internal/keys"
+)
+
+var ErrNoAvailableCookies = errors.New("no available cookies")
+var ErrNoAvailableTransports = errors.New("no available transports")
+
+type Client struct {
+	transports []transport.Transport
+	db         database.Executor
+	kms        keys.KeyManagementService
+}
+
+func NewClient(
+	db database.Executor,
+	kms keys.KeyManagementService,
+	transports ...transport.Transport,
+) *Client {
+	return &Client{transports, db, kms}
+}
+
+func (c *Client) getCookie(ctx context.Context, subject *string) (uint, *http.Cookie, error) {
+	if subject == nil {
+		// No subject requirement, get any cookie
+		cookie, err := database.GetAnyCookie(ctx, c.db, c.kms)
+		if err != nil {
+			return 0, nil, err
+		}
+		if cookie == nil {
+			return 0, nil, ErrNoAvailableCookies
+		}
+
+		return cookie.ID, cookie.ToHTTPCookie(), nil
+	}
+
+	// Get cookie by subject
+	cookies, err := database.GetCookies(ctx, c.db, c.kms, *subject, false)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	if len(cookies) == 0 {
+		return 0, nil, ErrNoAvailableCookies
+	}
+
+	cookie := cookies[0]
+
+	return cookie.ID, cookie.ToHTTPCookie(), nil
+}
+
+func (c *Client) Do(req *http.Request, opts ...optionFunc) (*http.Response, error) {
+	o := defaultOptions
+	for _, opt := range opts {
+		opt(&o)
+	}
+
+	// Sort and filter transports by properties
+	transports := transport.FilterTransports(c.transports, o.requiredProps)
+	transport.SortTransports(transports)
+
+	for _, tp := range transports {
+		resp, err := tp.Do(req)
+		if errors.Is(err, transport.ErrUnsupportedRequest) {
+			// Skip unsupported transport
+			continue
+		}
+		if err != nil {
+			slog.ErrorContext(req.Context(), "transport error",
+				"transport", tp.String(),
+				"error", err,
+			)
+			continue
+		}
+		if slices.Contains(o.expectedStatuses, resp.StatusCode) {
+			return resp, nil
+		} else {
+			slog.ErrorContext(req.Context(), "unexpected status code",
+				"transport", tp.String(),
+				"expected", o.expectedStatuses,
+				"actual", resp.StatusCode,
+			)
+			continue
+		}
+	}
+
+	return nil, ErrNoAvailableTransports
+}