Arproxy is a proxy between ActiveRecord and Database adapters. You can make a custom proxy what analyze and/or modify SQLs before DB adapter executes them.
Write your proxy and its configurations in Rails' config/initializers:
class QueryTracer < Arproxy::Base
def execute(sql, name=nil)
Rails.logger.debug sql
Rails.logger.debug caller(1).join("\n")
super(sql, name)
end
end
Arproxy.configure do |config|
config.adapter = "mysql2" # A DB Apdapter name which is used in your database.yml
config.use QueryTracer
end
Arproxy.enable!Then you can see the backtrace of SQLs in the Rails' log.
# In your Rails code
MyTable.where(:id => id).limit(1) # => The SQL and the backtrace appear in the logWithout Arproxy:
+-------------------------+ +------------------+
| ActiveRecord::Base#find |--execute(sql, name)-->| Database Adapter |
+-------------------------+ +------------------+
With Arproxy:
Arproxy.configure do |config|
config.adapter = "mysql2"
config.use MyProxy1
config.use MyProxy2
end+-------------------------+ +----------+ +----------+ +------------------+
| ActiveRecord::Base#find |--execute(sql, name)-->| MyProxy1 |-->| MyProxy2 |-->| Database Adapter |
+-------------------------+ +----------+ +----------+ +------------------+
class SlowQueryLogger < Arproxy::Base
def initialize(slow_ms)
@slow_ms = slow_ms
end
def execute(sql, name=nil)
result = nil
ms = Benchmark.ms { result = super(sql, name) }
if ms >= @slow_ms
Rails.logger.info "Slow(#{ms.to_i}ms): #{sql}"
end
result
end
end
Arproxy.configure do |config|
config.use SlowQueryLogger, 1000
endclass CommentAdder < Arproxy::Base
def execute(sql, name=nil)
sql += " /*this_is_comment*/"
super(sql, name)
end
endclass Readonly < Arproxy::Base
def execute(sql, name=nil)
if sql =~ /^(SELECT|SET|SHOW|DESCRIBE)\b/
super sql, name
else
Rails.logger.warn "#{name} (BLOCKED) #{sql}"
end
end
endIn the Rails' log you may see queries like this:
User Load (22.6ms) SELECT `users`.* FROM `users` WHERE `users`.`name` = 'Issei Naruta'
Then "User Load" is the name.
Arproxy is released under the MIT license:
Copyright (c) 2012 Issei Naruta
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