Beispiel #1
0
def message_server(lock, conn):
    """The GRASS message server function designed to be a target for
       multiprocessing.Process


       :param lock: A multiprocessing.Lock
       :param conn: A multiprocessing.Pipe

       This function will use the G_* message C-functions from grass.lib.gis
       to provide an interface to the GRASS C-library messaging system.

       The data that is send through the pipe must provide an
       identifier string to specify which C-function should be called.

       The following identifers are supported:

       - "INFO"       Prints an info message, see G_message() for details
       - "IMPORTANT"  Prints an important info message,
                      see G_important_message() for details
       - "VERBOSE"    Prints a verbose message if the verbosity level is
                      set accordingly, see G_verbose_message() for details
       - "WARNING"    Prints a warning message, see G_warning() for details
       - "ERROR"      Prints a message with a leading "ERROR: " string,
                      see G_important_message() for details
       - "PERCENT"    Prints a percent value based on three integer values: n, d and s
                      see G_percent() for details
       - "STOP"       Stops the server function and closes the pipe
       - "FATAL"      Calls G_fatal_error(), this functions is only for
                      testing purpose

       The that is end through the pipe must be a list of values:

       - Messages: ["INFO|VERBOSE|WARNING|ERROR|FATAL", "MESSAGE"]
       - Debug:    ["DEBUG", level, "MESSAGE"]
       - Percent:  ["PERCENT", n, d, s]

    """
    libgis.G_debug(1, "Start messenger server")

    while True:
        # Avoid busy waiting
        conn.poll(None)
        data = conn.recv()
        message_type = data[0]

        # Only one process is allowed to write to stderr
        lock.acquire()

        # Stop the pipe and the infinite loop
        if message_type == "STOP":
            conn.close()
            lock.release()
            libgis.G_debug(1, "Stop messenger server")
            sys.exit()

        message = data[1]
        # libgis limitation
        if isinstance(message, type(" ")):
            if len(message) >= 2000:
                message = message[:1999]

        if message_type == "PERCENT":
            n = int(data[1])
            d = int(data[2])
            s = int(data[3])
            libgis.G_percent(n, d, s)
        elif message_type == "DEBUG":
            level = data[1]
            message = data[2]
            libgis.G_debug(level, message)
        elif message_type == "VERBOSE":
            libgis.G_verbose_message(message)
        elif message_type == "INFO":
            libgis.G_message(message)
        elif message_type == "IMPORTANT":
            libgis.G_important_message(message)
        elif message_type == "WARNING":
            libgis.G_warning(message)
        elif message_type == "ERROR":
            libgis.G_important_message("ERROR: %s" % message)
        # This is for testing only
        elif message_type == "FATAL":
            libgis.G_fatal_error(message)

        lock.release()
Beispiel #2
0
def _fatal_error(lock, conn, data):
    """Calls G_fatal_error()"""
    libgis.G_fatal_error("Fatal Error in C library server")
 def test_something(self):
     libgis.G_fatal_error("Testing G_fatal_error() function call")