Add TooManyRequests error

src/galaxy/api/errors.py

@@ -22,6 +22,10 @@ class UnknownBackendResponse(ApplicationError):
     def __init__(self, data=None):
         super().__init__(4, "Backend responded in uknown way", data)
 
+class TooManyRequests(ApplicationError):
+    def __init__(self, data=None):
+        super().__init__(5, "Too many requests. Try again later", data)
+
 class InvalidCredentials(ApplicationError):
     def __init__(self, data=None):
         super().__init__(100, "Invalid credentials", data)
@@ -80,4 +84,4 @@ class MessageNotFound(ApplicationError):
 
 class ImportInProgress(ApplicationError):
     def __init__(self, data=None):
-        super().__init__(600, "Import already in progress", data)
+        super().__init__(600, "Import already in progress", data)

src/galaxy/http.py

@@ -6,10 +6,11 @@ import aiohttp
 import certifi
 
 from galaxy.api.errors import (
-    AccessDenied, AuthenticationRequired,
-    BackendTimeout, BackendNotAvailable, BackendError, NetworkError, UnknownBackendResponse, UnknownError
+    AccessDenied, AuthenticationRequired, BackendTimeout, BackendNotAvailable, BackendError, NetworkError,
+    TooManyRequests, UnknownBackendResponse, UnknownError
 )
 
+
 class HttpClient:
     def __init__(self, limit=20, timeout=aiohttp.ClientTimeout(total=60), cookie_jar=None):
         ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
@@ -39,6 +40,8 @@ class HttpClient:
             raise AccessDenied()
         if response.status == HTTPStatus.SERVICE_UNAVAILABLE:
             raise BackendNotAvailable()
+        if response.status == HTTPStatus.TOO_MANY_REQUESTS:
+            raise TooManyRequests()
         if response.status >= 500:
             raise BackendError()
         if response.status >= 400: