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module Rails
module Rack
# Enables easy tagging of any logging activity that occurs within the Rails request cycle. The tags are configured via the
# config.log_tags setting. The tags can either be strings, procs taking a request argument, or symbols representing method
# names on request (so :uuid will result in request.uuid being added as a tag).
class TaggedLogging
def initialize(app, tags = nil)
@app, @tags = app, tags
end
def call(env)
if @tags
Rails.logger.tagged(compute_tags(env)) { @app.call(env) }
else
@app.call(env)
end
end
private
def compute_tags(env)
request = ActionDispatch::Request.new(env)
@tags.collect do |tag|
case tag
when Proc
tag.call(request)
when Symbol
request.send(tag)
else
tag
end
end
end
end
end
end
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