每天一剂Rails良药之Handling Bounced Email

当Email发送失败时，我们可以捕获bounced messages来notify系统用户邮件发送出错
app/models/reminder.rb
[code]
class Reminder < ActionMailer::Base
def reminder(recipient, text)
@subject = 'Automated Reminder!'
@body = {:text => text}
@recipients = recipient
@from = 'chad@chadfowler.com'
@sent_on = Time.now
@headers = {}
end
end
[/code]
app/controllers/reminder_controller.rb
[code]
class ReminderController < ApplicationController
def deliver
mail = Reminder.deliver_reminder(params[:recipient], params[:text])
Delivery.create(:message_id => mail.messsage_id,
:recipient => params[:recipient],
:content => params[:text],
:status => 'Sent')
render :text => "Message id #{mail.message_id} sent."
end
end
[/code]
app/models/bounce_receiver.rb
[code]
class BounceReceiver < ActionMailer::Base

class BouncedDelivery
attr_accessor :status_info, :original_message_id
def self.from_email(email)
returning(bounce = self.new) do
status_part = email.parts.detect do |part|
part.content_type == "message/delivery-status"
end
statuses = status_part.body.split(/\n/)
bounce.status_info = statuses.inject({}) do |hash, line|
key, value = line.split(/:/)
hash[key] = value.strip rescue nil
hash
end
original_message_part = email.parts.detect do |part|
part.content_type == "message/rfc822"
end
parsed_msg = TMail::Mail.parse(original_message_part.body)
bounce.original_message_id = parsed_msg.message_id
end
end
def status
case status_info['Status']
when /^5/
'Failure'
when /^4/
'Temporary Failure'
when /^2/
'Success'
end
end
end


def receive(email)
return unless email.content_type == "multipart/report"
bounce = BouncedDelivery.from_email(email)
msg = Delivery.find_by_message_id(bounce.original_message_id)
msg.update_attribute(:status, bounce.status)
end

end
[/code]
其中Status 2.X.X表示发送成功，4.X.X表示暂时错误，等会将重试，5.X.X表示发送失败

BTW:《Rails Recipes》终于读完了，我们对Rails的View/Controller/Database/Test等等都有不少深入的探讨
下一步我们来看看一些常用或有用的插件，继续每天一剂Rails良药的学习。