Step 2. Create and Test sendEmial Function

In this section, you will create a function to implement the sendEmail program, and test the function through the console or by calling APIs.

Creating a sendEmail SCF

1. Log in to the Serverless Cloud Function Console. Select Guangzhou from the region list and click Create.

2. In the Function configuration section, enter sendEmail as the function name and keep default settings for the other options, and then click Next.

3. In the Function code section, enter index.main_handler as the execution method and paste the following codes into the code window, and then click Next.

# -*- coding: utf8 -*-
import json
import smtplib
from email.mime.text import MIMEText
from email.header import Header

#Third-party SMTP service
mail_host="smtp.qq.com"         #SMTP server
mail_user="3473058547@qq.com"     #User name
mail_pass="xxxxxxx"        #Password 
mail_port=465                   # SMTP service port

def sendEmail(fromAddr,toAddr,subject,content):
    sender = fromAddr
    receivers = [toAddr]  # To receive emails. You can set it as your QQ mailbox or other mailbox.

    message = MIMEText(content, 'plain', 'utf-8')
    message['From'] = Header(fromAddr, 'utf-8')
    message['To'] =  Header(toAddr, 'utf-8')
    message['Subject'] = Header(subject, 'utf-8')

    try:
        smtpObj = smtplib.SMTP_SSL(mail_host, mail_port) 
        smtpObj.login(mail_user,mail_pass)  
        smtpObj.sendmail(sender, receivers, message.as_string())
        print("send success") 
    except smtplib.SMTPException as e:
        print(e)
        print("Error: send fail") 

def main_handler(event, context):
    cmqMsg = None
    if event is not None and "Records" in event.keys():
        if len(event["Records"]) >= 1 and "CMQ" in event["Records"][0].keys():
            cmqMsgStr = event["Records"][0]["CMQ"]["msgBody"]
            cmqMsg = json.loads(cmqMsgStr)
    print cmqMsg
    sendEmail(cmqMsg['fromAddr'], cmqMsg['toAddr'], cmqMsg['title'], cmqMsg['body'])
    return "send email success"

4. In the Triggering method section, you need to test the function manually, so no trigger method is added currently. Click Complete.

Note
You must configure the mail_host, mail_user, mail_pass, and mail_port parameters based on the mailbox or mail server you use to receive emails. For example, you can view here to learn about how to enable the SMTP feature of QQ Mail. After it is enabled, the relevant parameters are as follows:

• mail_host: SMTP server "smtp.qq.com"
• mail_user: Your email address as the login user name, such as `3473058547@qq.com`
• mail_pass: The password you specified when you enable the SMTP feature.
• mail_port: The server login port. Since you can only log in to your QQ mailbox using SSL, the port must always be 465. Use smtplib.SMTP_SSL in codes to build SSL SMTP connection.

Testing the sendEmail SCF

When a function is created, it is generally tested through the console or API, to ensure the function output meets the expectation, and then you can bind it to a trigger for practical application.

1) In the details page of the sendEmail function you just created, click Test.

2) Enter the following in the test template:

{
  "Records": [
    {
      "CMQ": {
        "type": "topic",
        "topicOwner":1253970226,
        "topicName": "sendEmailQueue",
        "subscriptionName":"sendEmailFunction",
        "publishTime": "2017-09-25T06:34:00.000Z",
        "msgId": "123345346",
        "requestId":"123345346",
        "msgBody": "{\"fromAddr\":\"3473058547@qq.com\",\"toAddr\":\"3473058547@qq.com\",\"title\":\"hello from scf & cmq\",\"body\":\"email content to send\"}",
        "msgTag": []
      }
    }
  ]
}

You can modify both fromAddr and toAddr in the msgBody field to your email address. In this way, you can send an email from and to the same email address to test the validity of email sending. Here, we use `3473058547@qq.com` to test.

3) Click Run to view the results. This program is running normally if "send email success" is displayed in both the returned value and the log.

4) Go to the mailbox you specified to check whether the email is received. Open the email to check whether configured information is displayed.