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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2021-2022, by Samuel Williams.
require_relative '../context'
require 'console'
require 'fiber'
class Fiber
attr_accessor :traces_backend_context
end
module Traces
module Backend
# A backend which logs all spans to the console logger output.
module Console
# A span which validates tag assignment.
class Span
def initialize(context, instance, name)
@context = context
@instance = instance
@name = name
end
attr :context
# Assign some metadata to the span.
# @parameter key [String] The metadata key.
# @parameter value [Object] The metadata value. Should be coercable to a string.
def []= key, value
::Console.logger.info(@context, @name, "#{key} = #{value}")
end
end
module Interface
# Trace the given block of code and log the execution.
# @parameter name [String] A useful name/annotation for the recorded span.
# @parameter attributes [Hash] Metadata for the recorded span.
def trace(name, resource: self, attributes: {}, &block)
context = Context.nested(Fiber.current.traces_backend_context)
Fiber.current.traces_backend_context = context
::Console.logger.info(resource, name, attributes)
if block.arity.zero?
yield
else
yield Span.new(context, self, name)
end
end
# Assign a trace context to the current execution scope.
def trace_context= context
Fiber.current.traces_backend_context = context
end
# Get a trace context from the current execution scope.
def trace_context
Fiber.current.traces_backend_context
end
end
end
Interface = Console::Interface
end
end
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