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|
# frozen_string_literal: true
module Clusters
module Applications
class PrometheusConfigService
def initialize(project, cluster, app)
@project = project
@cluster = cluster
@app = app
end
def execute(config = {})
if has_alerts?
generate_alert_manager(config)
else
reset_alert_manager(config)
end
end
private
attr_reader :project, :cluster, :app
def reset_alert_manager(config)
config = set_alert_manager_enabled(config, false)
config.delete('alertmanagerFiles')
config['serverFiles'] ||= {}
config['serverFiles']['alerts'] = {}
config
end
def generate_alert_manager(config)
config = set_alert_manager_enabled(config, true)
config = set_alert_manager_files(config)
set_alert_manager_groups(config)
end
def set_alert_manager_enabled(config, enabled)
config['alertmanager'] ||= {}
config['alertmanager']['enabled'] = enabled
config
end
def set_alert_manager_files(config)
config['alertmanagerFiles'] = {
'alertmanager.yml' => {
'receivers' => alert_manager_receivers_params,
'route' => alert_manager_route_params
}
}
config
end
def set_alert_manager_groups(config)
config['serverFiles'] ||= {}
config['serverFiles']['alerts'] ||= {}
config['serverFiles']['alerts']['groups'] ||= []
environments_with_alerts.each do |env_name, alerts|
index = config['serverFiles']['alerts']['groups'].find_index do |group|
group['name'] == env_name
end
if index
config['serverFiles']['alerts']['groups'][index]['rules'] = alerts
else
config['serverFiles']['alerts']['groups'] << {
'name' => env_name,
'rules' => alerts
}
end
end
config
end
def alert_manager_receivers_params
[
{
'name' => 'gitlab',
'webhook_configs' => [
{
'url' => notify_url,
'send_resolved' => true,
'http_config' => {
'bearer_token' => alert_manager_token
}
}
]
}
]
end
def alert_manager_token
app.alert_manager_token
end
def alert_manager_route_params
{
'receiver' => 'gitlab',
'group_wait' => '30s',
'group_interval' => '5m',
'repeat_interval' => '4h'
}
end
def notify_url
::Gitlab::Routing.url_helpers
.notify_project_prometheus_alerts_url(project, format: :json)
end
def has_alerts?
environments_with_alerts.values.flatten(1).any?
end
def environments_with_alerts
@environments_with_alerts ||=
environments.each_with_object({}) do |environment, hash|
name = rule_name(environment)
hash[name] = alerts(environment)
end
end
def rule_name(environment)
"#{environment.name}.rules"
end
def alerts(environment)
alerts = Projects::Prometheus::AlertsFinder
.new(environment: environment)
.execute
alerts.map do |alert|
hash = alert.to_param
hash['expr'] = substitute_query_variables(hash['expr'], environment)
hash
end
end
def substitute_query_variables(query, environment)
result = ::Prometheus::ProxyVariableSubstitutionService.new(environment, query: query).execute
result[:params][:query]
end
def environments
project.environments_for_scope(cluster.environment_scope)
end
end
end
end
|
