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# frozen_string_literal: true
module Gitlab
module Graphql
module Tracers
# This graphql-ruby tracer records duration for trace events and merges
# the duration into the trace event's metadata. This way, separate tracers
# can all use the same duration information.
#
# NOTE: TimerTracer should be applied last **after** other tracers, so
# that it runs first (similar to function composition)
class TimerTracer
def self.use(schema)
schema.tracer(self.new)
end
def trace(key, data)
start_time = Gitlab::Metrics::System.monotonic_time
result = yield
duration_s = Gitlab::Metrics::System.monotonic_time - start_time
data[:duration_s] = duration_s
result
end
end
end
end
end
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