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module Gitlab
module Sherlock
# Rack middleware used for tracking request metrics.
class Middleware
CONTENT_TYPES = /text\/html|application\/json/i
IGNORE_PATHS = %r{^/sherlock}
def initialize(app)
@app = app
end
def call(env)
if instrument?(env)
call_with_instrumentation(env)
else
@app.call(env)
end
end
def call_with_instrumentation(env)
trans = Transaction.new(env['REQUEST_METHOD'], env['REQUEST_URI'])
retval = trans.run { @app.call(env) }
Sherlock.collection.add(trans)
retval
end
def instrument?(env)
!!(env['HTTP_ACCEPT'] =~ CONTENT_TYPES &&
env['REQUEST_URI'] !~ IGNORE_PATHS)
end
end
end
end
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