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You can use the custom runtime of Function Compute to write Lua functions in Function Compute. This topic describes how to deploy and invoke a Lua function. You can modify the Lua sample code as needed for custom development.

Prerequisites

Procedure

Run the following command to initialize a project:
```
s init fc-custom-lua-event -d fc-custom-lua-event
```
Note -d specifies the name of the folder in which the sample project resides. You can customize the folder name as required.
Run the following command to go to the project directory:
```
cd fc-custom-lua-event
```
Optional: Modify the sample code as needed for custom development.

Run the following command to deploy the project:

s deploy -y

Sample command output:

[2022-01-26 08:57:00] [INFO] [S-CLI] - Start the pre-action
[2022-01-26 08:57:00] [INFO] [S-CLI] - Action: s build --use-docker
[2022-01-26 08:57:01] [INFO] [FC-BUILD] - Build artifact start...
[2022-01-26 08:57:02] [INFO] [FC-BUILD] - Use docker for building.
[2022-01-26 08:57:02] [INFO] [FC-BUILD] - No need build for this project.
[2022-01-26 08:57:02] [INFO] [FC-BUILD] - Build artifact successfully.

Tips for next step
======================
* Invoke Event Function: s local invoke
* Invoke Http Function: s local start
* Deploy Resources: s deploy
End of method: build
[2022-01-26 08:57:02] [INFO] [S-CLI] - End the pre-action
 Checking Service, Function (3.57s)
 Creating Service, Function (114.37s)

Tips for next step
======================
* Display information of the deployed resource: s info
* Display metrics: s metrics
* Display logs: s logs
* Invoke remote function: s invoke
* Remove Service: s remove service
* Remove Function: s remove function
* Remove Trigger: s remove trigger
* Remove CustomDomain: s remove domain

helloworld:
  region:   cn-hangzhou
  service:
    name: hello-world-service
  function:
    name:       luaEventFunc
    runtime:    custom
    handler:    index.handler
    memorySize: 1024
    timeout:    30

Run the following command to remotely invoke the function:

s invoke -e "hello"

Sample command output:

========= FC invoke Logs begin =========
FC Invoke Start RequestId: cbc4a3c1-72bb-4d0d-91f8-061c99a5****, client: 21.0.XX.XX, server: , request: "POST /invoke HTTP/1.1", host: "21.0.XX.XX:9000"
2022/01/26 09:04:37 [notice] 8#8: *2 [lua] main.lua:26: hello, client: 21.0.XX.XX, server: , request: "POST /invoke HTTP/1.1", host: "21.0.XX.XX:9000"
2022/01/26 09:04:37 [notice] 8#8: *2 [lua] main.lua:28: FC Invoke End RequestId: cbc4a3c1-72bb-4d0d-91f8-061c99a5****, client: 21.0.3.254, server: , request: "POST /invoke HTTP/1.1", host: "21.0.XX.XX:9000"

Duration: 1.93 ms, Billed Duration: 2 ms, Memory Size: 1024 MB, Max Memory Used: 9.44 MB
========= FC invoke Logs end =========

FC Invoke Result:
hello



End of method: invoke