[seiscomp, scanloc] Install, add .gitignore

lib/python/seiscomp/fdsnws/log.py

@@ -0,0 +1,101 @@
+################################################################################
+# Copyright (C) 2013-2014 gempa GmbH
+#
+# Thread-safe file logger
+#
+# Author:  Stephan Herrnkind
+# Email:   herrnkind@gempa.de
+################################################################################
+
+import os
+import sys
+import time
+import threading
+
+from queue import Queue
+
+# -------------------------------------------------------------------------------
+
+
+def _worker(log):
+    while True:
+        # pylint: disable=W0212
+        msg = log._queue.get()
+        log._write(str(msg))
+        log._queue.task_done()
+
+
+################################################################################
+class Log:
+    # ---------------------------------------------------------------------------
+    def __init__(self, filePath, archiveSize=7):
+        self._filePath = filePath
+        self._basePath = os.path.dirname(filePath)
+        self._fileName = os.path.basename(filePath)
+        self._archiveSize = archiveSize
+        self._queue = Queue()
+        self._lastLogTime = None
+        self._fd = None
+
+        self._archiveSize = max(self._archiveSize, 0)
+
+        # worker thread, responsible for writing messages to file
+        t = threading.Thread(target=_worker, args=(self,))
+        t.daemon = True
+        t.start()
+
+    # ---------------------------------------------------------------------------
+    def __del__(self):
+        # wait for worker thread to write all pending log messages
+        self._queue.join()
+
+        if self._fd is not None:
+            self._fd.close()
+
+    # ---------------------------------------------------------------------------
+    def log(self, msg):
+        self._queue.put(msg)
+
+    # ---------------------------------------------------------------------------
+    def _rotate(self):
+        self._fd.close()
+        self._fd = None
+
+        try:
+            pattern = f"{self._filePath}.%i"
+            for i in range(self._archiveSize, 1, -1):
+                src = pattern % (i - 1)
+                if os.path.isfile(src):
+                    os.rename(pattern % (i - 1), pattern % i)
+            os.rename(self._filePath, pattern % 1)
+        except Exception as e:
+            print(f"failed to rotate access log: {e}", file=sys.stderr)
+
+        self._fd = open(self._filePath, "w", encoding="utf-8")
+
+    # ---------------------------------------------------------------------------
+    def _write(self, msg):
+        try:
+            now = time.localtime()
+            if self._fd is None:
+                if self._basePath and not os.path.exists(self._basePath):
+                    os.makedirs(self._basePath)
+                self._fd = open(self._filePath, "a", encoding="utf-8")
+            elif (
+                self._archiveSize > 0
+                and self._lastLogTime is not None
+                and (
+                    self._lastLogTime.tm_yday != now.tm_yday
+                    or self._lastLogTime.tm_year != now.tm_year
+                )
+            ):
+                self._rotate()
+
+            print(msg, file=self._fd)
+            self._fd.flush()
+            self._lastLogTime = now
+        except Exception as e:
+            print(f"access log: {e}", file=sys.stderr)
+
+
+# vim: ts=4 et