How to use libknot - 6 common examples

#!/usr/bin/env python3

import sys

from dnstest.utils import Skip
import dnstest.params as params

try:
    sys.path.append(params.repo_binary("python"))
    import libknot.control
    libknot.control.load_lib(params.libknot_lib)
except:
    raise Skip("libknot not available or set KNOT_TEST_LIBKNOT to another libknot without ASAN")

try:
            ctl.send_block(cmd="stats", flags=ctl_flags)
            global_stats = ctl.receive_stats()
        except:
            pass

        # Get zone metrics.
        zone_stats = dict()
        try:
            ctl.send_block(cmd="zone-stats", flags=ctl_flags)
            zone_stats = ctl.receive_stats()
        except:
           pass

        # Disconnect from the server.
        ctl.send(libknot.control.KnotCtlType.END)
        ctl.close()

        # Publish the stats.
        stats = {**global_stats, **zone_stats}
        self.wfile.write(bytes(json.dumps(stats, indent=4, sort_keys=True), "utf-8"))

try:
        ctl.send_block(cmd="stats", flags="F")
        global_stats = ctl.receive_stats()
    except:
        pass

    # Get zone metrics.
    zone_stats = dict()
    try:
        ctl.send_block(cmd="zone-stats", flags="F")
        zone_stats = ctl.receive_stats()
    except:
        pass

    # Disconnect from the server.
    ctl.send(libknot.control.KnotCtlType.END)
    ctl.close()

    # Prepare the metrics to publish.
    output = io.StringIO()

    stats = {**global_stats, **zone_stats}
    timestamp = str(int(time.time()))

    for metric in stats["server"]:
        print("server,instance=" + instance + ",metric=" + metric + " value=" +
              stats["server"][metric] + " " + timestamp, file=output)

    for group in stats["mod-stats"]:
        for metric in stats["mod-stats"][group]:
            print(group + ",instance=" + instance + ",metric=" + metric +
                  " value=" + stats["mod-stats"][group][metric] + " " + timestamp,

def do_GET(self):
        self.send_response(200)
        self.send_header("Content-type", "text/html")
        self.end_headers()

        # Connect to Knot server.
        ctl = libknot.control.KnotCtl()
        ctl.connect(ctl_socket)
        ctl.set_timeout(ctl_timeout)

        # Get global metrics.
        global_stats = dict()
        try:
            ctl.send_block(cmd="stats", flags=ctl_flags)
            global_stats = ctl.receive_stats()
        except:
            pass

        # Get zone metrics.
        zone_stats = dict()
        try:
            ctl.send_block(cmd="zone-stats", flags=ctl_flags)
            zone_stats = ctl.receive_stats()

def send():
    # Connect to Knot server.
    ctl = libknot.control.KnotCtl()
    ctl.connect(ctl_socket)
    ctl.set_timeout(ctl_timeout)

    # Get global metrics.
    global_stats = dict()
    try:
        ctl.send_block(cmd="stats", flags="F")
        global_stats = ctl.receive_stats()
    except:
        pass

    # Get zone metrics.
    zone_stats = dict()
    try:
        ctl.send_block(cmd="zone-stats", flags="F")
        zone_stats = ctl.receive_stats()

def load_lib(path=None):
    """Loads the libknot library."""

    if path is None:
        version = ""
        try:
            from libknot import LIBKNOT_VERSION
            version = ".%u" % int(LIBKNOT_VERSION)
        except:
            pass

        if sys.platform == "darwin":
            path = "libknot%s.dylib" % version
        else:
            path = "libknot.so%s" % version
    LIB = cdll.LoadLibrary(path)

    global CTL_ALLOC
    CTL_ALLOC = LIB.knot_ctl_alloc
    CTL_ALLOC.restype = c_void_p

    global CTL_FREE
    CTL_FREE = LIB.knot_ctl_free
    CTL_FREE.argtypes = [c_void_p]