Overview

This document describes how to develop a simple Hello World web service in the Serverless Cloud Function (SCF) Console.

Prerequisites

• You have already registered a Tencent Cloud account. If you haven't done so yet, click here to sign up.
• You have already logged in to the SCF Console.

Directions

Writing function

1. Click Function Service on the left sidebar to enter the "Function Service" page.
2. Select Guangzhou at the top of the page and click Create as shown below:
   
3. Enter the basic information of the function on the "Create Function" page and click Next as shown below:
   
   • Function name: enter helloworld.
   • Runtime environment: select "Python 2.7".
   • Create Method: select "Function Template".
   • Filter: after entering helloworld, press "Enter" to search for and select the "helloworld" template.
4. Keep the default function configuration and click Complete as shown below:
   After the function is created, you will be automatically redirected to its "Function configuration" page where you can view its configuration information.
   
   • "Execution" is set to "index.main_handler", indicating that the SCF Console will automatically save this snippet of code as an index.py file, compress it, and upload it to SCF for function creation.
   • main_handler in the sample code is the entry function, which has the following main parameters:
     • event parameter: gets information of the triggering source.
     • context parameter: gets the environment and configuration information of this function.
5. Select the Function code tab to view or edit the function code online as shown below:
   

Deploying function (with trigger configured)

1. After editing the function code online, click Save and the function will be deployed.
2. On the details page of the created function, select Trigger Management on the left and click Create a Trigger.
3. In the Create a Trigger window that pops up, set "Trigger Method" to "API Gateway Trigger" and keep other parameters as default as shown below:
   
4. Click Submit to complete the function deployment and trigger configuration.

Cloud test

Testing function deployment

Select Function code and click Test to run the code and return the test result as shown below:

Note：

• If you need to replace the test template or its content, you can directly edit the function content or select Current Test Template, replace it, and then click Save.
• Different test templates simulate different trigger message sources, and the messages passed between different triggers and SCF are data structures agreed upon in advance. For more information, please see Trigger Overview.

During this test, SCF will get the data structures of the "Hello world event template" in the event parameter of the main_handler.

{
  "key1": "test value 1",
  "key2": "test value 2"
}

Testing trigger configuration

1. After a trigger is successfully created, an access path will be generated on the "Trigger Method" page of the function as shown below:
   
2. Open the access path in a browser. If "hello from scf" is displayed, the function is successfully deployed.

Viewing logs

On the details page of a created function, select Log Query on the left to view the detailed logs of the function as shown below:

For more information on logs, please see Viewing Execution Logs.

Viewing monitoring information

On the details page of a created function, select Monitoring information to view metrics such as function invocations and execution duration as shown below:

Note：

The minimal granularity of monitoring statistics collection is 1 minute. You need to wait for 1 minute before you can view the current monitoring record.

For more information on monitoring, please see Description of Monitoring Metrics.

Configuring alarm

On the details page of a created function, click click here to configure an alarm policy for the function to monitor its running status as shown below:

For more information on how to configure an alarm, please see Configuring Alarm.