class PerfCheck::Middleware
Attributes
app[R]
query_count[RW]
Public Class Methods
new(app)
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# File lib/perf_check/middleware.rb, line 8 def initialize(app) @app = app self.query_count = 0 ActiveSupport::Notifications.subscribe('sql.active_record') do |_| self.query_count += 1 end end
Public Instance Methods
call(env)
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# File lib/perf_check/middleware.rb, line 17 def call(env) self.query_count = 0 begin status, headers, body = app.call(env) rescue => error status, headers, body = 500, { "X-PerfCheck-StackTrace" => stacktrace_for(error) }, [''] end headers['X-PerfCheck-Query-Count'] = query_count.to_s [status, headers, body] end
stacktrace_for(e)
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These files are used by the perf_check daemon app
# File lib/perf_check/middleware.rb, line 30 def stacktrace_for(e) trace_file = "#{Rails.root}/tmp/perf_check_traces" << "/trace-#{SecureRandom.hex(16)}.txt" FileUtils.mkdir_p(File.dirname(trace_file)) File.open(trace_file, 'w') do |f| f.puts("#{e.class}: #{e.message}") f.write(e.backtrace.join("\n")) end trace_file end