Support account_host and check blob size attribute exists (#341)

Author: KeerthiYandaOS

adlfs/spec.py

@@ -624,10 +624,16 @@ def do_connect(self):
                 self.service_client = AIOBlobServiceClient.from_connection_string(
                     conn_str=self.connection_string
                 )
-            elif self.account_name:
-                self.account_url: str = (
-                    f"https://{self.account_name}.blob.core.windows.net"
-                )
+            elif self.account_name is not None:
+                if hasattr(self, 'account_host'):
+                    self.account_url: str = (
+                        f"https://{self.account_host}"
+                    )
+                else:
+                    self.account_url: str = (
+                        f"https://{self.account_name}.blob.core.windows.net"
+                    )
+                
                 creds = [self.credential, self.account_key]
                 if any(creds):
                     self.service_client = [
@@ -981,7 +987,7 @@ async def _ls(
                                                 outblobs.append(blob_)
                                             elif (
                                                 blob_["name"].count("/") == depth
-                                                and blob_["size"] == 0
+                                                and (hasattr(blob_, "size") and blob_["size"] == 0)
                                             ):
                                                 outblobs.append(blob_)
                                             else:
@@ -2068,10 +2074,15 @@ def connect_client(self):
         ValueError if none of the connection details are available
         """
         try:
+            if hasattr(self.fs, 'account_host'):
+                self.fs.account_url: str = (
+                    f"https://{self.fs.account_host}"
+                )
+            else:
+                self.fs.account_url: str = (
+                    f"https://{self.fs.account_name}.blob.core.windows.net"
+                )
 
-            self.fs.account_url: str = (
-                f"https://{self.fs.account_name}.blob.core.windows.net"
-            )
             creds = [self.fs.sync_credential, self.fs.account_key, self.fs.credential]
             if any(creds):
                 self.container_client = [