95 lines
2.8 KiB
Ruby
95 lines
2.8 KiB
Ruby
module Gitlab
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# Helper methods to interact with Prometheus network services & resources
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class PrometheusClient
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Error = Class.new(StandardError)
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QueryError = Class.new(Gitlab::PrometheusClient::Error)
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attr_reader :rest_client, :headers
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def initialize(rest_client)
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@rest_client = rest_client
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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 JSON::ParserError
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raise PrometheusClient::Error, 'Parsing response failed'
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rescue Errno::ECONNREFUSED
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raise PrometheusClient::Error, 'Connection refused'
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end
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def get(path, args)
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response = rest_client[path].get(params: args)
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handle_response(response)
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rescue SocketError
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raise PrometheusClient::Error, "Can't connect to #{rest_client.url}"
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rescue OpenSSL::SSL::SSLError
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raise PrometheusClient::Error, "#{rest_client.url} contains invalid SSL data"
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rescue RestClient::ExceptionWithResponse => ex
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if ex.response
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handle_exception_response(ex.response)
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else
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raise PrometheusClient::Error, "Network connection error"
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end
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rescue RestClient::Exception
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raise PrometheusClient::Error, "Network connection error"
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end
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def handle_response(response)
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json_data = JSON.parse(response.body)
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if response.code == 200 && json_data['status'] == 'success'
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json_data['data'] || {}
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else
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raise PrometheusClient::Error, "#{response.code} - #{response.body}"
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end
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end
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def handle_exception_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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json_data = JSON.parse(response.body)
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raise PrometheusClient::QueryError, json_data['error'] || 'Bad data received'
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else
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raise PrometheusClient::Error, "#{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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