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# frozen_string_literal: true
module Gitlab
module Metrics
# Class for tracking timing information about method calls
class MethodCall
include Gitlab::Metrics::Methods
BASE_LABELS = { module: nil, method: nil }.freeze
attr_reader :real_time, :cpu_time, :call_count, :labels
define_histogram :gitlab_method_call_duration_seconds do
docstring 'Method calls real duration'
base_labels Transaction::BASE_LABELS.merge(BASE_LABELS)
buckets [0.01, 0.05, 0.1, 0.5, 1]
with_feature :prometheus_metrics_method_instrumentation
end
# name - The full name of the method (including namespace) such as
# `User#sign_in`.
#
def initialize(name, module_name, method_name, transaction)
@module_name = module_name
@method_name = method_name
@transaction = transaction
@name = name
@labels = { module: @module_name, method: @method_name }
@real_time = 0.0
@cpu_time = 0.0
@call_count = 0
end
# Measures the real and CPU execution time of the supplied block.
def measure
start_real = System.monotonic_time
start_cpu = System.cpu_time
retval = yield
real_time = System.monotonic_time - start_real
cpu_time = System.cpu_time - start_cpu
@real_time += real_time
@cpu_time += cpu_time
@call_count += 1
if above_threshold?
self.class.gitlab_method_call_duration_seconds.observe(@transaction.labels.merge(labels), real_time)
end
retval
end
# Returns a Metric instance of the current method call.
def to_metric
Metric.new(
Instrumentation.series,
{
duration: real_time.in_milliseconds.to_i,
cpu_duration: cpu_time.in_milliseconds.to_i,
call_count: call_count
},
method: @name
)
end
# Returns true if the total runtime of this method exceeds the method call
# threshold.
def above_threshold?
real_time.in_milliseconds >= ::Gitlab::Metrics.method_call_threshold
end
end
end
end
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