From 7d799b85d6644fc1676b21277ce758b5bd313a5b Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Mon, 31 Jul 2017 15:53:32 +0300
Subject: Add: scripts to handle slog files

---
 slog-errors | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 slog-pretty | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100755 slog-errors
 create mode 100755 slog-pretty

diff --git a/slog-errors b/slog-errors
new file mode 100755
index 0000000..920e87d
--- /dev/null
+++ b/slog-errors
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+#
+# Read Qvarn structured log files, look for errors, and output all
+# messages related to a failed HTTP request (status code 5xx).
+
+
+import json
+import sys
+
+
+def parse_log_file(filename):
+    with open(filename) as f:
+        for line in f:
+            yield json.loads(line)
+
+
+def find_contexts(msgs):
+    return set(get_context(msg) for msg in msgs)
+
+
+def get_context(msg):
+    return msg['_context'], msg['_process_id'], msg['_thread_id']
+
+
+def is_in_context(msg, context):
+    return get_context(msg) == context
+
+
+def filter_msgs(msgs, func):
+    for msg in msgs:
+        if func(msg):
+            yield msg
+
+def has_error_status(msgs):
+    for msg in msgs:
+        if msg['msg_type'] == 'error':
+            return True
+        if msg['msg_type'] == 'http-response' and msg['status'] >= 400:
+            return True
+        if '_traceback' in msg:
+            return True
+    return False
+
+
+def show_msgs(msgs):
+    sys.stdout.write(json.dumps(msgs))
+    sys.stdout.write('\n')
+
+
+msgs = []
+for filename in sys.argv[1:]:
+    for msg in parse_log_file(filename):
+        msg['_filename'] = filename
+        msgs.append(msg)
+
+
+contexts = find_contexts(msgs)
+for context in contexts:
+    context_msgs = list(filter_msgs(msgs, lambda m: is_in_context(m, context)))
+    if has_error_status(context_msgs):
+        show_msgs(context_msgs)
diff --git a/slog-pretty b/slog-pretty
new file mode 100755
index 0000000..80f07fb
--- /dev/null
+++ b/slog-pretty
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+import json
+import sys
+
+import yaml
+
+
+def text_representer(dumper, data):
+    if '\n' in data:
+        return dumper.represent_scalar(
+            u'tag:yaml.org,2002:str', data, style='|')
+    return dumper.represent_scalar(
+        u'tag:yaml.org,2002:str', data, style='')
+
+yaml.add_representer(str, text_representer)
+yaml.add_representer(unicode, text_representer)
+
+
+def dump(f):
+    for line in f:
+        obj = json.loads(line.strip())
+        yaml.dump(
+            obj, stream=sys.stdout, indent=4, default_flow_style=False,
+            explicit_start=True, explicit_end=True)
+
+
+if len(sys.argv) == 1:
+    dump(sys.stdin)
+else:
+    for filename in sys.argv[1:]:
+        with open(filename) as f:
+            dump(f)
-- 
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