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83 lines
2.5 KiB
Ruby
83 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# Setting TRACE_PG_CONNECTIONS=1 will cause all pg connections
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# to be streamed to files for debugging. The filenames are formatted
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# like tmp/pgtrace/{{PID}}_{{CONNECTION_OBJECT_ID}}.txt
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#
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# Setting TRACE_PG_CONNECTIONS=SIDEKIQ will only trace connections
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# on in sidekiq (safer, because there will be minimal user-facing perf impact)
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#
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# Files will be automatically deleted when the connection is closed gracefully
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# (e.g. when activerecord closes it after a period of inactivity)
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# Files will not be automatically deleted when closed abruptly
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# (e.g. terminating/restarting the app process)
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#
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# Warning: this could create some very large files!
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if ENV["TRACE_PG_CONNECTIONS"]
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PG::Connection.prepend(Module.new do
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TRACE_DIR = "tmp/pgtrace"
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def initialize(*args)
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super(*args).tap do
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next if ENV["TRACE_PG_CONNECTIONS"] == "SIDEKIQ" && !Sidekiq.server?
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FileUtils.mkdir_p(TRACE_DIR)
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@trace_filename = "#{TRACE_DIR}/#{Process.pid}_#{self.object_id}.txt"
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trace File.new(@trace_filename, "w")
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end
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@access_log_mutex = Mutex.new
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@accessor_thread = nil
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end
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def close
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super.tap do
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next if ENV["TRACE_PG_CONNECTIONS"] == "SIDEKIQ" && !Sidekiq.server?
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File.delete(@trace_filename)
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end
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end
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def log_access(&blk)
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@access_log_mutex.synchronize do
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if !@accessor_thread.nil?
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Rails.logger.error <<~STRING
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PG Clash: A connection is being accessed from two locations
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#{@accessor_thread} was using the connection. Backtrace:
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#{@accessor_thread.backtrace.join("\n")}
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#{Thread.current} is now attempting to use the connection. Backtrace:
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#{Thread.current.backtrace.join("\n")}
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STRING
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end
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@accessor_thread = Thread.current
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end
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result = yield
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@access_log_mutex.synchronize do
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@accessor_thread = nil
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end
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result
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end
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end)
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class PG::Connection
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LOG_ACCESS_METHODS = [:exec, :sync_exec, :async_exec,
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:sync_exec_params, :async_exec_params,
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:sync_prepare, :async_prepare,
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:sync_exec_prepared, :async_exec_prepared,
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]
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LOG_ACCESS_METHODS.each do |method|
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new_method = "#{method}_without_logging".to_sym
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alias_method new_method, method
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define_method(method) do |*args, &blk|
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log_access { send(new_method, *args, &blk) }
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end
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end
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end
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end
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