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class HealthController < ActionController::Base
protect_from_forgery with: :exception
include RequiresHealthToken
CHECKS = [
Gitlab::HealthChecks::DbCheck,
Gitlab::HealthChecks::RedisCheck,
Gitlab::HealthChecks::FsShardsCheck
].freeze
def readiness
results = CHECKS.map { |check| [check.name, check.readiness] }
render_check_results(results)
end
def liveness
results = CHECKS.map { |check| [check.name, check.liveness] }
render_check_results(results)
end
def metrics
results = CHECKS.flat_map(&:metrics)
response = results.map(&method(:metric_to_prom_line)).join("\n")
render text: response, content_type: 'text/plain; version=0.0.4'
end
private
def metric_to_prom_line(metric)
labels = metric.labels&.map { |key, value| "#{key}=\"#{value}\"" }&.join(',') || ''
if labels.empty?
"#{metric.name} #{metric.value}"
else
"#{metric.name}{#{labels}} #{metric.value}"
end
end
def render_check_results(results)
flattened = results.flat_map do |name, result|
if result.is_a?(Gitlab::HealthChecks::Result)
[[name, result]]
else
result.map { |r| [name, r] }
end
end
success = flattened.all? { |name, r| r.success }
response = flattened.map do |name, r|
info = { status: r.success ? 'ok' : 'failed' }
info['message'] = r.message if r.message
info[:labels] = r.labels if r.labels
[name, info]
end
render json: response.to_h, status: success ? :ok : :service_unavailable
end
end
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