config.py 文件源码

def _install_handlers(cp, formatters):
    """Install and return handlers"""
    hlist = cp.get("handlers", "keys")
    if not len(hlist):
        return {}
    hlist = hlist.split(",")
    hlist = _strip_spaces(hlist)
    handlers = {}
    fixups = [] #for inter-handler references
    for hand in hlist:
        sectname = "handler_%s" % hand
        klass = cp.get(sectname, "class")
        opts = cp.options(sectname)
        if "formatter" in opts:
            fmt = cp.get(sectname, "formatter")
        else:
            fmt = ""
        try:
            klass = eval(klass, vars(logging))
        except (AttributeError, NameError):
            klass = _resolve(klass)
        args = cp.get(sectname, "args")
        args = eval(args, vars(logging))
        h = klass(*args)
        if "level" in opts:
            level = cp.get(sectname, "level")
            h.setLevel(logging._levelNames[level])
        if len(fmt):
            h.setFormatter(formatters[fmt])
        if issubclass(klass, logging.handlers.MemoryHandler):
            if "target" in opts:
                target = cp.get(sectname,"target")
            else:
                target = ""
            if len(target): #the target handler may not be loaded yet, so keep for later...
                fixups.append((h, target))
        handlers[hand] = h
    #now all handlers are loaded, fixup inter-handler references...
    for h, t in fixups:
        h.setTarget(handlers[t])
    return handlers