module Mongo module Logging # Log a message with the given level. def log(level, msg) return unless @logger case level when :debug then @logger.debug "MONGODB [DEBUG] #{msg}" when :warn then @logger.warn "MONGODB [WARNING] #{msg}" when :error then @logger.error "MONGODB [ERROR] #{msg}" when :fatal then @logger.fatal "MONGODB [FATAL] #{msg}" else @logger.info "MONGODB [INFO] #{msg}" end end # Execute the block and log the operation described by name and payload. def instrument(name, payload = {}, &blk) res = yield log_operation(name, payload) res end protected def log_operation(name, payload) @logger ||= nil return unless @logger msg = "#{payload[:database]}['#{payload[:collection]}'].#{name}(" msg += payload.values_at(:selector, :document, :documents, :fields ).compact.map(&:inspect).join(', ') + ")" msg += ".skip(#{payload[:skip]})" if payload[:skip] msg += ".limit(#{payload[:limit]})" if payload[:limit] msg += ".sort(#{payload[:order]})" if payload[:order] @logger.debug "MONGODB #{msg}" end end end