Faraday::DetailedLogger

A Faraday middleware used for providing debug- and info-level logging information. The request and response logs follow very closely with cURL output for ease of understanding.

Caution: Be careful about your log level settings when using this middleware, especially in a production environment. With a DEBUG level log enabled, there will be information security concerns.

At a DEBUG level, the request and response headers and their bodies will be logged. This means that if you have Authorization information or API keys in your headers or are passing around sensitive information in the bodies, only an INFO level or above should be used.

No headers or bodies are logged at an INFO or greater log level.

Add this line to your application's Gemfile:

gem "faraday-detailed_logger"

And then execute:

$ bundle

Or install it yourself as:

$ gem install faraday-detailed_logger

Once required, the logger can be added to any Faraday connection by inserting it into your connection's request/response stack:

require 'faraday'
require 'faraday/detailed_logger'

connection = Faraday.new(:url => "http://sushi.com") do |faraday|
  faraday.request  :url_encoded
  faraday.response :detailed_logger # <-- Inserts the logger into the connection.
  faraday.adapter  Faraday.default_adapter
end

By default, the Faraday::DetailedLogger will log to STDOUT. If this is not your desired log location, simply provide any Logger-compatible object as a parameter to the middleware definition:

require 'faraday'
require 'faraday/detailed_logger'
require 'logger'

my_logger = Logger.new("logfile.log")
my_logger.level = Logger::INFO

connection = Faraday.new(:url => "http://sushi.com") do |faraday|
  faraday.request  :url_encoded
  faraday.response :detailed_logger, my_logger # <-- sets a custom logger.
  faraday.adapter  Faraday.default_adapter
end

Or, perhaps use your Rails logger:

faraday.response :detailed_logger, Rails.logger

Further, you might like to tag logged output to make it easily located in your logs:

faraday.response :detailed_logger, Rails.logger, "Sushi Request"

Because logs generally work best with a single line of data per entry, the DEBUG-level output which contains the headers and bodies is inspected prior to logging. This crushes down and slightly manipulates the multi-line output one would expect when performing a verbose cURL operation into a log-compatible single line.

Below is a contrived example showing how this works. Presuming cURL generated the following request and received the associated response:

$ curl -v -d "requestbody=content" http://sushi.com/temaki
> GET /temaki HTTP/1.1
> User-Agent: Faraday::DetailedLogger
> Host: sushi.com
> Content-Type: application/x-www-form-urlencoded
> 
> requestbody=content
>
< HTTP/1.1 200 OK
< Content-Type: application/json
< 
< {"order_id":"1"}

The Faraday::DetailedLogger would log something similar to the following, with DEBUG-level logging enabled:

POST http://sushi.com/nigirizushi
"User-Agent: Faraday::DetailedLogger\nContent-Type: application/x-www-form-urlencoded\n\nrequestbody=content"
HTTP 200
"Content-Type: application/json\n\n{\"order_id\":\"1\"}"

Log output for the request-portion of an HTTP interaction:

POST http://sushi.com/temaki
"User-Agent: Faraday v0.9.0\nAccept: application/json\nContent-Type: application/json\n\n{\"name\":\"Polar Bear\",\"ingredients\":[\"Tuna\",\"Salmon\",\"Cream Cheese\",\"Tempura Flakes\"],\"garnish\":\"Eel Sauce\"}"

The POST line is logged at an INFO level just before the request is transmitted to the remote system. The second line containing the request headers and body are logged at a DEBUG level.

Log output for the response-portion of an HTTP interaction: Response portion:

HTTP 202
"server: nginx\ndate: Tue, 01 Jul 2014 21:56:52 GMT\ncontent-type: application/json\ncontent-length: 17\nconnection: close\nstatus: 202 Accepted\n\n{\"order_id\":\"1\"}"

The HTTP status line is logged at an INFO level at the same time the response is returned from the remote system. The second line containing the response headers and body are logged at a DEBUG level.

Bug reports and pull requests are welcome on GitHub at https://github.com/envylabs/faraday-detailed_logger.

The gem is available as open source under the terms of the MIT License.

The dependencies and sub-dependencies of this gem are checked to be available for Private Use, Commercial Use, Modification, and Distribution:

• 2-Clause BSD License
• Apache 2.0 License
• MIT License
• Ruby License