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from elasticapm.instrumentation.packages.base import AbstractInstrumentedModule
from elasticapm.traces import capture_span

try:
    from functools import lru_cache
except ImportError:
    from cachetools.func import lru_cache


class PyLibMcInstrumentation(AbstractInstrumentedModule):
    name = "pylibmc"

    instrument_list = [
        ("pylibmc", "Client.get"),
        ("pylibmc", "Client.get_multi"),
        ("pylibmc", "Client.set"),
        ("pylibmc", "Client.set_multi"),
        ("pylibmc", "Client.add"),
        ("pylibmc", "Client.replace"),
        ("pylibmc", "Client.append"),
        ("pylibmc", "Client.prepend"),
        ("pylibmc", "Client.incr"),
        ("pylibmc", "Client.decr"),
        ("pylibmc", "Client.gets"),
        ("pylibmc", "Client.cas"),
        ("pylibmc", "Client.delete"),
        ("pylibmc", "Client.delete_multi"),
        ("pylibmc", "Client.touch"),
        ("pylibmc", "Client.get_stats"),
    ]

    def call(self, module, method, wrapped, instance, args, kwargs):
        wrapped_name = self.get_wrapped_name(wrapped, instance, method)
        address, port = get_address_port_from_instance(instance)
        destination = {
            "address": address,
            "port": port,
        }
        with capture_span(
            wrapped_name,
            span_type="cache",
            span_subtype="memcached",
            span_action="query",
            extra={"destination": destination},
            leaf=True,
        ):
            return wrapped(*args, **kwargs)


@lru_cache(10)
def get_address_port_from_instance(instance):
    address, port = None, None
    if instance.addresses:
        first_address = instance.addresses[0]
        if ":" in first_address:
            address, port = first_address.split(":", 1)
            try:
                port = int(port)
            except ValueError:
                port = None
    return address, port
