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require 'prometheus/client/registry'
require 'prometheus/client/configuration'
require 'prometheus/client/mmaped_value'
module Prometheus
# Client is a ruby implementation for a Prometheus compatible client.
module Client
class << self
attr_writer :configuration
def configuration
@configuration ||= Configuration.new
end
def configure
yield(configuration)
end
# Returns a default registry object
def registry
@registry ||= Registry.new
end
def logger
configuration.logger
end
def pid
configuration.pid_provider.call
end
# Resets the registry and reinitializes all metrics files.
# Use case: clean up everything in specs `before` block,
# to prevent leaking the state between specs which are updating metrics.
def reset!
@registry = nil
::Prometheus::Client::MmapedValue.reset_and_reinitialize
end
def cleanup!
Dir.glob("#{configuration.multiprocess_files_dir}/*.db").each { |f| File.unlink(f) if File.exist?(f) }
end
# With `force: false`: reinitializes metric files only for processes with the changed PID.
# With `force: true`: reinitializes all metrics files.
# Always keeps the registry.
# Use case (`force: false`): pick up new metric files on each worker start,
# without resetting already registered files for the master or previously initialized workers.
def reinitialize_on_pid_change(force: false)
if force
::Prometheus::Client::MmapedValue.reset_and_reinitialize
else
::Prometheus::Client::MmapedValue.reinitialize_on_pid_change
end
end
end
end
end
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