Merge pull request #178 from rawler/optional-capture-all

stream+ws_client: Optional capture-all

Author: k8s-ci-robot

stream/stream.py

@@ -16,7 +16,8 @@
 
 
 def stream(func, *args, **kwargs):
-    """Stream given API call using websocket"""
+    """Stream given API call using websocket.
+    Extra kwarg: capture-all=True - captures all stdout+stderr for use with WSClient.read_all()"""
 
     def _intercept_request_call(*args, **kwargs):
         # old generated code's api client has config. new ones has

stream/ws_client.py

@@ -24,6 +24,7 @@
 import yaml
 
 from six.moves.urllib.parse import urlencode, quote_plus, urlparse, urlunparse
+from six import StringIO
 
 from websocket import WebSocket, ABNF, enableTrace
 
@@ -33,9 +34,16 @@
 ERROR_CHANNEL = 3
 RESIZE_CHANNEL = 4
 
+class _IgnoredIO:
+    def write(self, _x):
+        pass
+
+    def getvalue(self):
+        raise TypeError("Tried to read_all() from a WSClient configured to not capture. Did you mean `capture_all=True`?")
+
 
 class WSClient:
-    def __init__(self, configuration, url, headers):
+    def __init__(self, configuration, url, headers, capture_all):
         """A websocket client with support for channels.
 
             Exec command uses different channels for different streams. for
@@ -47,7 +55,10 @@ def __init__(self, configuration, url, headers):
         header = []
         self._connected = False
         self._channels = {}
-        self._all = ""
+        if capture_all:
+            self._all = StringIO()
+        else:
+            self._all = _IgnoredIO()
 
         # We just need to pass the Authorization, ignore all the other
         # http headers we get from the generated code
@@ -157,8 +168,8 @@ def read_all(self):
         TODO: Maybe we can process this and return a more meaningful map with
         channels mapped for each input.
         """
-        out = self._all
-        self._all = ""
+        out = self._all.getvalue()
+        self._all = self._all.__class__()
         self._channels = {}
         return out
 
@@ -195,7 +206,7 @@ def update(self, timeout=0):
                         if channel in [STDOUT_CHANNEL, STDERR_CHANNEL]:
                             # keeping all messages in the order they received
                             # for non-blocking call.
-                            self._all += data
+                            self._all.write(data)
                         if channel not in self._channels:
                             self._channels[channel] = data
                         else:
@@ -257,6 +268,7 @@ def websocket_call(configuration, *args, **kwargs):
     url = args[1]
     _request_timeout = kwargs.get("_request_timeout", 60)
     _preload_content = kwargs.get("_preload_content", True)
+    capture_all = kwargs.get("capture_all", True)
     headers = kwargs.get("headers")
 
     # Expand command parameter list to indivitual command params
@@ -272,7 +284,7 @@ def websocket_call(configuration, *args, **kwargs):
         url += '?' + urlencode(query_params)
 
     try:
-        client = WSClient(configuration, get_websocket_url(url), headers)
+        client = WSClient(configuration, get_websocket_url(url), headers, capture_all)
         if not _preload_content:
             return client
         client.run_forever(timeout=_request_timeout)