Skip parsing non-docker endpoints

Signed-off-by: aiordache <anca.iordache@docker.com>

docker/context/context.py

@@ -16,30 +16,42 @@ class Context:
         if not name:
             raise Exception("Name not provided")
         self.name = name
+        self.context_type = None
         self.orchestrator = orchestrator
+        self.endpoints = {}
+        self.tls_cfg = {}
+        self.meta_path = "IN MEMORY"
+        self.tls_path = "IN MEMORY"
+
         if not endpoints:
+            # set default docker endpoint if no endpoint is set
             default_endpoint = "docker" if (
                 not orchestrator or orchestrator == "swarm"
                 ) else orchestrator
+
             self.endpoints = {
                 default_endpoint: {
                     "Host": get_context_host(host, tls),
                     "SkipTLSVerify": not tls
                 }
             }
-        else:
-            for k, v in endpoints.items():
-                ekeys = v.keys()
-                for param in ["Host", "SkipTLSVerify"]:
-                    if param not in ekeys:
-                        raise ContextException(
-                            "Missing parameter {} from endpoint {}".format(
-                                param, k))
-            self.endpoints = endpoints
+            return
 
-        self.tls_cfg = {}
-        self.meta_path = "IN MEMORY"
-        self.tls_path = "IN MEMORY"
+        # check docker endpoints
+        for k, v in endpoints.items():
+            if not isinstance(v, dict):
+                # unknown format
+                raise ContextException("""Unknown endpoint format for
+                    context {}: {}""".format(name, v))
+
+            self.endpoints[k] = v
+            if k != "docker":
+                continue
+
+            self.endpoints[k]["Host"] = v.get("Host", get_context_host(
+                host, tls))
+            self.endpoints[k]["SkipTLSVerify"] = bool(v.get(
+                "SkipTLSVerify", not tls))
 
     def set_endpoint(
             self, name="docker", host=None, tls_cfg=None,
@@ -59,9 +71,13 @@ class Context:
 
     @classmethod
     def load_context(cls, name):
-        name, orchestrator, endpoints = Context._load_meta(name)
-        if name:
-            instance = cls(name, orchestrator, endpoints=endpoints)
+        meta = Context._load_meta(name)
+        if meta:
+            instance = cls(
+                meta["Name"],
+                orchestrator=meta["Metadata"].get("StackOrchestrator", None),
+                endpoints=meta.get("Endpoints", None))
+            instance.context_type = meta["Metadata"].get("Type", None)
             instance._load_certs()
             instance.meta_path = get_meta_dir(name)
             return instance
@@ -69,26 +85,30 @@ class Context:
 
     @classmethod
     def _load_meta(cls, name):
-        metadata = {}
         meta_file = get_meta_file(name)
-        if os.path.isfile(meta_file):
-            with open(meta_file) as f:
+        if not os.path.isfile(meta_file):
+            return None
+
+        metadata = {}
         try:
             with open(meta_file) as f:
                 metadata = json.load(f)
-                    for k, v in metadata["Endpoints"].items():
-                        metadata["Endpoints"][k]["SkipTLSVerify"] = bool(
-                            v["SkipTLSVerify"])
         except (IOError, KeyError, ValueError) as e:
             # unknown format
             raise Exception("""Detected corrupted meta file for
                 context {} : {}""".format(name, e))
 
-            return (
-                metadata["Name"],
-                metadata["Metadata"].get("StackOrchestrator", None),
-                metadata["Endpoints"])
-        return None, None, None
+        # for docker endpoints, set defaults for
+        # Host and SkipTLSVerify fields
+        for k, v in metadata["Endpoints"].items():
+            if k != "docker":
+                continue
+            metadata["Endpoints"][k]["Host"] = v.get(
+                "Host", get_context_host(None, False))
+            metadata["Endpoints"][k]["SkipTLSVerify"] = bool(
+                v.get("SkipTLSVerify", True))
+
+        return metadata
 
     def _load_certs(self):
         certs = {}
@@ -157,6 +177,9 @@ class Context:
         result.update(self.Storage)
         return result
 
+    def is_docker_host(self):
+        return self.context_type is None
+
     @property
     def Name(self):
         return self.name
@@ -164,8 +187,12 @@ class Context:
     @property
     def Host(self):
         if not self.orchestrator or self.orchestrator == "swarm":
-            return self.endpoints["docker"]["Host"]
-        return self.endpoints[self.orchestrator]["Host"]
+            endpoint = self.endpoints.get("docker", None)
+            if endpoint:
+                return endpoint.get("Host", None)
+            return None
+
+        return self.endpoints[self.orchestrator].get("Host", None)
 
     @property
     def Orchestrator(self):