Introduce save load test

[deliverable/lttng-ivc.git] / lttng_ivc / utils / utils.py

diff --git a/lttng_ivc/utils/utils.py b/lttng_ivc/utils/utils.py
index b8a1b37a0ca2a95089a3e22c279467eb4e29c328..37e09e197226ec1b9c9abf9a5da5f17aaa60ae6a 100644 (file)
--- a/lttng_ivc/utils/utils.py
+++ b/lttng_ivc/utils/utils.py
@@ -2,6 +2,11 @@ import signal
 import hashlib
 import os
 import time
+import socket
+
+from lxml import etree
+from contextlib import closing
+
 
 def line_count(file_path):
     line_count = 0
@@ -43,18 +48,57 @@ def __dummy_sigusr1_handler():
 
 
 def sessiond_spawn(runtime):
+    agent_port = find_free_port()
     previous_handler = signal.signal(signal.SIGUSR1, __dummy_sigusr1_handler)
-    sessiond = runtime.spawn_subprocess("lttng-sessiond -vvv -S")
+    sessiond = runtime.spawn_subprocess("lttng-sessiond -vvv -S --agent-tcp-port {}".format(agent_port))
     signal.sigtimedwait({signal.SIGUSR1}, 60)
     previous_handler = signal.signal(signal.SIGUSR1, previous_handler)
     return sessiond
 
 
+def find_free_port():
+    # There is no guarantee that the port will be free at runtime but should be
+    # good enough
+    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
+        s.bind(('', 0))
+        return s.getsockname()[1]
 
 
-def file_contains(stderr_file, list_of_string):
-    with open(stderr_file, 'r') as stderr:
-        for line in stderr:
+def file_contains(file_path, list_of_string):
+    with open(file_path, 'r') as f:
+        for line in f:
             for s in list_of_string:
                 if s in line:
                     return True
+
+
+def find_dir(root, name):
+    """
+    Returns the absolute path or None.
+    """
+    abs_path = None
+    for base, dirs, files in os.walk(root):
+        for tmp in dirs:
+            if tmp.endswith(name):
+                abs_path = os.path.abspath(os.path.join(base, tmp))
+    return abs_path
+
+
+def xpath_query(xml_file, xpath):
+    """
+    Return a list of xml node corresponding to the xpath. The list can be of lenght
+    zero.
+    """
+    with open(xml_file, 'r') as f:
+        tree = etree.parse(f)
+        root = tree.getroot()
+        # Remove all namespace
+        # https://stackoverflow.com/questions/18159221/remove-namespace-and-prefix-from-xml-in-python-using-lxml
+        for elem in root.getiterator():
+            if not hasattr(elem.tag, 'find'):
+                continue
+            i = elem.tag.find('}')
+            if i >= 0:
+                elem.tag = elem.tag[i+1:]
+
+        return root.xpath(xpath)