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# frozen_string_literal: true
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# Released under the MIT License.
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# Copyright, 2021-2023, by Samuel Williams.
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require_relative '../context'
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require 'console'
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require 'fiber'
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Fiber.attr_accessor :traces_backend_context
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module Traces
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module Backend
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# A backend which logs all spans to the console logger output.
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module Console
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# A span which validates tag assignment.
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class Span
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# Initialize a new span.
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# @parameter context [Context] The context in which the span is recorded.
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# @parameter name [String] A useful name/annotation for the recorded span.
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def initialize(context, name)
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@context = context
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@name = name
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end
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# @attribute [Context] The context in which the span is recorded.
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attr :context
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# Assign some metadata to the span.
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# @parameter key [String] The metadata key.
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# @parameter value [Object] The metadata value. Should be coercable to a string.
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def []= key, value
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::Console.logger.info(@context, @name, "#{key} = #{value}")
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end
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end
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# The console backend interface.
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module Interface
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# Trace the given block of code and log the execution.
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# @parameter name [String] A useful name/annotation for the recorded span.
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# @parameter attributes [Hash] Metadata for the recorded span.
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def trace(name, resource: nil, attributes: {}, &block)
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context = Context.nested(Fiber.current.traces_backend_context)
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Fiber.current.traces_backend_context = context
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::Console.logger.info(resource || self, name, attributes)
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if block.arity.zero?
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yield
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else
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yield Span.new(context, name)
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end
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end
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# Assign a trace context to the current execution scope.
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def trace_context= context
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Fiber.current.traces_backend_context = context
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end
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# Get a trace context from the current execution scope.
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def trace_context
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Fiber.current.traces_backend_context
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end
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# @returns [Boolean] Whether there is an active trace.
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def active?
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!!Fiber.current.traces_backend_context
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end
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end
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end
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Interface = Console::Interface
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end
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end
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