83 lines
2.2 KiB
Ruby
83 lines
2.2 KiB
Ruby
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 PrometheusClient
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attr_reader :api_url, :rest_client, :headers
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def initialize(api_url:, rest_client: nil, headers: nil)
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@api_url = api_url
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@rest_client = rest_client || RestClient::Resource.new(api_url)
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@headers = headers || {}
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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, time: Time.now)
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get_result('vector') do
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json_api_get('query', query: query, time: time.to_f)
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end
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end
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def query_range(query, start: 8.hours.ago, stop: Time.now)
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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: stop.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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def label_values(name = '__name__')
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json_api_get("label/#{name}/values")
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end
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def series(*matches, start: 8.hours.ago, stop: Time.now)
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json_api_get('series', 'match': matches, start: start.to_f, end: stop.to_f)
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end
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private
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def json_api_get(type, args = {})
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path = ['api', 'v1', type].join('/')
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get(path, 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 get(path, args)
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response = rest_client[path].get(headers.merge(params: args))
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handle_response(response)
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rescue SocketError
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raise PrometheusError, "Can't connect to #{url}"
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rescue OpenSSL::SSL::SSLError
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raise PrometheusError, "#{url} contains invalid SSL data"
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rescue HTTParty::Error
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raise PrometheusError, "Network connection error"
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end
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def handle_response(response)
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json_data = json_response(response)
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if response.code == 200 && json_data['status'] == 'success'
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json_data['data'] || {}
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elsif response.code == 400
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raise PrometheusError, json_data['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 json_response(response)
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JSON.parse(response.body)
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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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