Calculate and replace timestamp with relative timestamp to given timestamp string.

Test: manually.
Change-Id: I11b59005595bf709125c4e4fc484140d83e0da71

1 files changed, 55 insertions, 0 deletions

diff --git a/perf_tools/parse_timestamp.py b/perf_tools/parse_timestamp.py
new file mode 100644
index 00000000..bfac3f71
--- /dev/null
+++ b/perf_tools/parse_timestamp.py
@@ -0,0 +1,55 @@
+import sys
+import os
+from datetime import datetime
+
+# Usage:
+# replace_timestamp.py input.txt output.txt timestamp_string
+#
+# Description:
+# Replace timestamp in the input.txt with the difference timestamp to timestamp_string.
+#
+# Example: replace_timestamp.py input.txt output.txt "01-28 18:12:30.339".
+#
+def main():
+    filepath = sys.argv[1]
+    if not os.path.isfile(filepath):
+        print("File path {} does not exist. Exiting...".format(filepath))
+        sys.exit()
+
+    output_filepath = sys.argv[2]
+
+    timestamp_str = sys.argv[3]
+    date_time_obj = datetime.strptime(timestamp_str, '%m-%d %H:%M:%S.%f')
+
+    output_fp = open(output_filepath, 'w')
+    i = 1
+    with open(filepath, 'r', errors = 'ignore') as fp:
+        for line in fp:
+            newline = replace_timestamp_abs(line, timestamp_str, date_time_obj)
+            output_fp.write(newline)
+            i = i + 1
+    fp.close()
+    output_fp.close()
+
+
+def replace_timestamp_abs(line, timestamp_str, date_time_obj0):
+    if line[:5] != timestamp_str[:5]:
+        return line
+
+    index = line.find(" ", 6)
+    if index <= 0:
+        return line
+    substr0 = line[:index]
+    substr1 = line[index:]
+
+    try:
+        date_time_obj = datetime.strptime(substr0, '%m-%d %H:%M:%S.%f')
+    except ValueError:
+        return line
+
+    date_time_delta = date_time_obj - date_time_obj0
+    date_time_delta_str = str(date_time_delta)
+    return date_time_delta_str + substr1
+
+if __name__ == '__main__':
+    main()