71 lines
1.6 KiB
Ruby
71 lines
1.6 KiB
Ruby
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module Gitlab
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PrometheusError = Class.new(StandardError)
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# Helper methods to interact with Prometheus network services & resources
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class Prometheus
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attr_reader :api_url
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def initialize(api_url:)
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@api_url = api_url
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end
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def ping
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json_api_get('query', query: '1')
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end
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def query(query)
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get_result('vector') do
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json_api_get('query', query: query)
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end
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end
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def query_range(query, start: 8.hours.ago)
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get_result('matrix') do
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json_api_get('query_range',
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query: query,
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start: start.to_f,
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end: Time.now.utc.to_f,
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step: 1.minute.to_i)
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end
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end
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private
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def json_api_get(type, args = {})
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get(join_api_url(type, args))
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rescue Errno::ECONNREFUSED
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raise PrometheusError, 'Connection refused'
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end
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def join_api_url(type, args = {})
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url = URI.parse(api_url)
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rescue URI::Error
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raise PrometheusError, "Invalid API URL: #{api_url}"
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else
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url.path = [url.path.sub(%r{/+\z}, ''), 'api', 'v1', type].join('/')
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url.query = args.to_query
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url.to_s
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end
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def get(url)
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handle_response(HTTParty.get(url))
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end
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def handle_response(response)
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if response.code == 200 && response['status'] == 'success'
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response['data'] || {}
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elsif response.code == 400
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raise PrometheusError, response['error'] || 'Bad data received'
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else
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raise PrometheusError, "#{response.code} - #{response.body}"
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end
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end
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def get_result(expected_type)
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data = yield
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data['result'] if data['resultType'] == expected_type
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end
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end
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end
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