Separating rails logs per action
I have rails 3 app that generates a lot of requests for analytics. 开发者_开发百科Unfortunately this drowns the logs and I lose the main page requests that I actually care about. I want to separate these requests in to a separate log file. Is there a way to specify certain actions to go to a certain log file? Or possibly a way to reduce the logging level of these actions, and then only show certain level logs when reading back the log file?
I found this site, which talked about using a middleware for silencing log actions. I used the same sort of idea and ended up writing a middleware that would swap the logger depending on which action was being called. Here is the middleware, which i put in lib/noisy_logger.rb
class NoisyLogger < Rails::Rack::Logger
def initialize app, opts = {}
@default_log = Rails.logger
# Put the noisy log in the same directory as the default log.
@noisy_log = Logger.new Rails.root.join('log', 'noisy.log')
@app = app
@opts = opts
@opts[:noisy] = Array @opts[:noisy]
super app
end
def call env
if @opts[:noisy].include? env['PATH_INFO']
logfile = @noisy_log
else
logfile = @default_log
end
# What?! Why are these all separate?
ActiveRecord::Base.logger = logfile
ActionController::Base.logger = logfile
Rails.logger = logfile
# The Rails::Rack::Logger class is responsible for logging the
# 'starting GET blah blah' log line. We need to call super here (as opposed
# to @app.call) to make sure that line gets output. However, the
# ActiveSupport::LogSubscriber class (which Rails::Rack::Logger inherits
# from) caches the logger, so we have to override that too
@logger = logfile
super
end
end
And then this goes in config/initializers/noisy_log.rb
MyApp::Application.config.middleware.swap(
Rails::Rack::Logger, NoisyLogger, :noisy => "/analytics/track"
)
Hope that helps someone!
One option could be using a service like New Relic which would give you the required scoping (per action).
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