Add log_line() which logs a single line to a given file. The file's path is
given relative to a certain base dir.
Add set_log_dir() which sets the base dir.
This is useful for logging the output of kvm_subprocess. kvm_subprocess can
take a callback function, which it calls with each line of output it gets from
the running subprocess. Redirecting kvm_subprocess's output to the regular log
files is done by passing it logging.debug or logging.info. However, in order
to log to other files, we'd have to pass kvm_subprocess a custom logger method,
e.g. our_custom_logger.debug. Unfortunately, such methods (called
instancemethods) cannot be pickled, and kvm_subprocess relies on pickling.
This patch offers an easy yet somewhat dirty solution to the problem.
Signed-off-by: Michael Goldish <mgoldish@xxxxxxxxxx>
---
client/tests/kvm/kvm_utils.py | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/client/tests/kvm/kvm_utils.py b/client/tests/kvm/kvm_utils.py
index 1399892..8569ac3 100644
--- a/client/tests/kvm/kvm_utils.py
+++ b/client/tests/kvm/kvm_utils.py
@@ -732,6 +732,43 @@ def find_free_ports(start_port, end_port, count):
return ports
+# An easy way to log lines to files when the logging system can't be used
+
+_open_log_files = {}
+_log_file_dir = "/tmp"
+
+
+def log_line(filename, line):
+ """
+ Write a line to a file. '\n' is appended to the line.
+
+ @param filename: Path of file to write to, either absolute or relative to
+ the dir set by set_log_file_dir().
+ @param line: Line to write.
+ """
+ global _open_log_files, _log_file_dir
+ if filename not in _open_log_files:
+ path = get_path(_log_file_dir, filename)
+ try:
+ os.makedirs(os.path.dirname(path))
+ except OSError:
+ pass
+ _open_log_files[filename] = open(path, "w")
+ timestr = time.strftime("%Y-%m-%d %H:%M:%S")
+ _open_log_files[filename].write("%s: %s\n" % (timestr, line))
+ _open_log_files[filename].flush()
+
+
+def set_log_file_dir(dir):
+ """
+ Set the base directory for log files created by log_line().
+
+ @param dir: Directory for log files.
+ """
+ global _log_file_dir
+ _log_file_dir = dir
+
+
# The following are miscellaneous utility functions.
def get_path(base_path, user_path):
--
1.5.4.1
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