show sdr device log messages in the web configuration

owrx/log/__init__.py

@@ -0,0 +1,52 @@
+import threading
+import os
+from logging import Logger, Handler, LogRecord, Formatter
+
+
+class LogPipe(threading.Thread):
+
+    def __init__(self, level: int, logger: Logger, prefix: str = ""):
+        threading.Thread.__init__(self)
+        self.daemon = False
+        self.level = level
+        self.logger = logger
+        self.prefix = prefix
+        self.fdRead, self.fdWrite = os.pipe()
+        self.pipeReader = os.fdopen(self.fdRead)
+        self.start()
+
+    def fileno(self):
+        return self.fdWrite
+
+    def run(self):
+        for line in iter(self.pipeReader.readline, ''):
+            self.logger.log(self.level, "{}: {}".format(self.prefix, line.strip('\n')))
+
+        self.pipeReader.close()
+
+    def close(self):
+        os.close(self.fdWrite)
+
+
+class HistoryHandler(Handler):
+    handlers = {}
+
+    @staticmethod
+    def getHandler(name: str):
+        if name not in HistoryHandler.handlers:
+            HistoryHandler.handlers[name] = HistoryHandler()
+        return HistoryHandler.handlers[name]
+
+    def __init__(self, maxRecords: int = 200):
+        super().__init__()
+        self.history = []
+        self.maxRecords = maxRecords
+        self.setFormatter(Formatter(fmt="%(asctime)s - %(name)s - %(levelname)s - %(message)s"))
+
+    def emit(self, record: LogRecord) -> None:
+        self.history.append(record)
+        # truncate
+        self.history = self.history[-self.maxRecords:]
+
+    def getFormattedHistory(self) -> str:
+        return "\n".join([self.format(r) for r in self.history])