Creating a Function from Scratch and Executing the Function¶
This section describes how to quickly create and test a HelloWorld function on the FunctionGraph console.
Prerequisites¶
Grant the FunctionGraph operation permissions to the user.
To perform the operations described in this section, ensure that you have the FunctionGraph FullAccess permissions, that is, all permissions for FunctionGraph. For more information, see Permissions Management.
Step 1: Create a Function¶
Log in to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
Click Create Function in the upper right corner and choose Create from scratch.
On the displayed page, enter HelloWorld for Function Name and retain the default values for other parameters by referring to Figure 1, and click Create Function. The following describes the parameters.
Function Type: Select Event Function.
Region: The default value is used. You can select other regions.
Regions are geographic areas isolated from each other. Resources are region-specific and cannot be used across regions through internal network connections. For low network latency and quick resource access, select the nearest region.
Function Name: enter HelloWorld.
Enterprise Project: The default value is default. You can select the created enterprise project.
Enterprise projects let you manage cloud resources and users by project.
Agency: By default, no agency is used. You can select an existing agency.
Specify an agency if you want to delegate FunctionGraph to access other cloud services, such as LTS and VPC.
Runtime: Select a runtime to compile the function. Default: Node.js 16.17. You can select another runtime.
Advanced Settings: Collect Logs is disabled by default. If it is enabled, function execution logs will be reported to Log Tank Service (LTS). You will be billed for log management on a pay-per-use basis.
Table 1 Parameters for configuring Collect Logs¶ Parameter
Description
Log Configuration
You can select Auto or Custom.
Auto: Use the default log group and log stream. Log groups prefixed with "functiongraph.log.group" are filtered out.
Custom: Select a custom log group and log stream. Log streams that are in the same enterprise project as your function.
Log Tag
You can use these tags to filter function logs in LTS. You can add 10 more tags.
Tag key/value: Enter a maximum of 64 characters. Only digits, letters, underscores (_), and hyphens (-) are allowed.
Figure 1 Configuring basic information¶
Configure the code source, copy the following code to the code window, and click Deploy.
The sample code enables you to obtain test events and print test event information.
exports.handler = function (event, context, callback) { const error = null; const output = `Hello message: ${JSON.stringify(event)}`; callback(error, output); }
Step 2: Test the Function¶
On the function details page, click Test. In the displayed dialog box, create a test event.
Select blank-template, set Event Name to test, modify the test event as follows, and click Create.
{ "hello": "function" }
Figure 2 Configuring a test event¶
Step 3: View the Execution Result¶
Click Test and view the execution result on the right.
Function Output: displays the return result of the function.
Log Output: displays the execution logs of the function.
Summary: displays key information of the logs.
Figure 3 Viewing the execution result¶
Note
A maximum of 2 KB logs can be displayed. For more log information, see Querying Function Logs.