Logging Savon SOAP requests/responses in Rails

savon.rb

# initializers/savon.rb

# Savon Global configuration
Savon.configure do |config|
  config.log = true
  config.log_level = :debug
  config.logger = Rails.logger
  config.env_namespace = :soapenv
end

HTTPI.log = false

# Log SOAP requests/responses in pretty JSON instead of XML
class Savon::SOAP::Request
  def log_request(url, headers, body)
    log_calling_line
    SAVON_LOGGER.info "\n###### REQUEST:"
    SAVON_LOGGER.info "URL: #{url}"
    SAVON_LOGGER.info "Headers: #{headers}"
    log_soap_prettily body
  end

  def log_response(code, body)
    SAVON_LOGGER.info "\n###### RESPONSE:"
    SAVON_LOGGER.info "Status Code: #{code}"
    log_soap_prettily body
    SAVON_LOGGER.info "-"*50 + "\n\n"
  end

  def log_calling_line
    calling_line = caller[1..-1].find { |line| line.include?(Rails.root.to_s) }
    return unless calling_line
    calling_line.sub!(Rails.root.to_s + "/", "")
    file, line, _ = calling_line.split(":")
    code_line = File.readlines(file)[line.to_i - 1].strip
    SAVON_LOGGER.info "\n\n" + "-"*50
    SAVON_LOGGER.info "SOAP request started at #{Time.now}"
    SAVON_LOGGER.info calling_line
    SAVON_LOGGER.info "# #{code_line}"
  end

  def log_soap_prettily(soap)
    hash = Hash.from_xml(soap)
    body = hash["Envelope"]["Body"]
    json = JSON.pretty_generate(body)
    SAVON_LOGGER.info json
  end
end

savon_log_output.log

--------------------------------------------------
SOAP request started at 2013-03-11 13:34:41 +0530
app/models/some_web_service.rb:55:in `block (2 levels) in <class:SomeWebService>'
# response = send(WSDL[2]).request(:ns ,"#{WSDL[2]}_#{action}_request") do |soap, wsdl, http|

###### REQUEST:
URL: https://webserice.provider.com/services/some-service
Headers: {"charset"=>"UTF-8", "Connection"=>"Keep-Alive", "SOAPAction"=>"http://webserice.provider.com/some_kind_of_request/update", "Content-Type"=>"text/xml;charset=UTF-8", "Content-Length"=>"833"}
{
  "some_kind_of_request_update": {
    "identification": {
      "email": "foo@bar.com",
      "password": "12345"
    }
  }
}


###### RESPONSE:
Status Code: 200
{
  "some_kind_of_response_update": {
    "xmlns": "https://webserice.provider.com/services/some-service/types/1.6",
    "identification": {
      "id": "blah-blah",
      "secret": "blah-blah",
      "email": "foo@bar.com",
      "password": "12345"
    },
    "status": {
      "code": "200",
      "message": "OK"
    }
  }
}
--------------------------------------------------

savon_logger.rb

# lib/savon_logger.rb

class SavonLogger < Logger; end

logdir = "#{Rails.root}/log/savon"
Dir.mkdir(logdir) unless File.exists?(logdir)
logfile = File.open("#{logdir}/#{Time.now.to_date.to_s}.log", 'a')
logfile.sync = true  # automatically flushes data to file
SAVON_LOGGER = SavonLogger.new(logfile)


# require this in desired environment file

This looks great!

However I get:
NoMethodError: undefined method `configure' for Savon:Module

Because:
Savon has moved to version 2 and Savon.configure is no longer supported
Ref: http://savonrb.com/version2/globals.html

Any solution?

I figured out from here http://savonrb.com/version2/globals.html that

Although they are called "global options", they really are local to a client instance. Savon version 1 was based on a global Savon.configure method to store the configuration. While this was a popular concept back then, adapted by tons of libraries, its problem is global state. I tried to fix that problem.

So I figured out that I could use something like this (instead of the above savon monkey patch code):

  client = Savon.client(
      wsdl: variable_with_wsdl_url,
      log: true,
      log_level: :debug,
      logger: Logger.new('log/savon.log', 10, 1024000)
    )

The logging output in Savon 2 isn't that bad, so I'll go with that instead of your code. But thanks for sharing though!