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"""MetricsService for publishing stress test qps data."""

import time

from src.proto.grpc.testing import metrics_pb2

GAUGE_NAME = 'python_overall_qps'


class MetricsServer(metrics_pb2.MetricsServiceServicer):

    def __init__(self, histogram):
        self._start_time = time.time()
        self._histogram = histogram

    def _get_qps(self):
        count = self._histogram.get_data().count
        delta = time.time() - self._start_time
        self._histogram.reset()
        self._start_time = time.time()
        return int(count / delta)

    def GetAllGauges(self, request, context):
        qps = self._get_qps()
        return [metrics_pb2.GaugeResponse(name=GAUGE_NAME, long_value=qps)]

    def GetGauge(self, request, context):
        if request.name != GAUGE_NAME:
            raise Exception('Gauge {} does not exist'.format(request.name))
        qps = self._get_qps()
        return metrics_pb2.GaugeResponse(name=GAUGE_NAME, long_value=qps)