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You can use the custom runtime of Function Compute to write functions in Function Compute by using Dart. This topic describes how to deploy and invoke a Dart function. You can modify the Dart sample code to perform secondary development.

Prerequisites

The following operations are complete:

Procedure

Run the following command in the target directory to initialize the project:
```
s init start-fc-custom-samples -d start-fc-custom-samples
```
Run the following command to go to the project directory:
```
cd start-fc-custom-samples/dart/event-demo/
```

Run the following command to install dependencies:

make biuld

Sample output:

docker run --rm -it -v $(pwd):/tmp google/dart:2.8.4 bash -c "export PUB_HOSTED_URL=https://pub.flutter-io.cn && cd tmp/code && dart2native index.dart && mv index.exe bootstrap"
Unable to find image 'google/dart:2.8.4' locally
2.8.4: Pulling from google/dart
291bafe4382e: Pull complete
0cbc81b3bc90: Pull complete
Digest: sha256:0ddfc141f0f03b41822ebf6b7245f5fbfcdea89be08f7617f49a7b01a1571dd1
Status: Downloaded newer image for google/dart:2.8.4
Generated: /tmp/code/index.exe
chmod +x code/bootstrap

Run the following command to deploy the project:

s deploy -y

Sample output:

[2021-09-09T10:14:08.452] [INFO ] [S-CLI] - Start ...
[2021-09-09T10:14:08.992] [INFO ] [FC-DEPLOY] - Using region: cn-hangzhou
[2021-09-09T10:14:08.993] [INFO ] [FC-DEPLOY] - Using access alias: default
[2021-09-09T10:14:08.993] [INFO ] [FC-DEPLOY] - Using accessKeyID: 188077086902****
[2021-09-09T10:14:08.993] [INFO ] [FC-DEPLOY] - Using accessKeySecret: LTAI4G4cwJkK4Rza6xd9****
  Using fc deploy type: sdk, If you want to deploy with pulumi, you can [s cli fc-default set deploy-type pulumi] to switch.
[2021-09-09T10:14:09.272] [INFO ] [FC-DEPLOY] - Checking Service custom-demo exists
[2021-09-09T10:14:09.502] [INFO ] [FC-DEPLOY] - Checking Function dartEventFunc exists
  Make service custom-demo success.
  Make function custom-demo/dartEventFunc success.
[2021-09-09T10:14:37.070] [INFO ] [FC-DEPLOY] - Checking Service custom-demo exists
[2021-09-09T10:14:37.108] [INFO ] [FC-DEPLOY] - Checking Function dartEventFunc exists

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



fc-dart-demo-dart-func:
  region: cn-hangzhou
  service:
    name: custom-demo
  function:
    name: dartEventFunc
    runtime: custom
    handler: index.handler
    memorySize: 1024
    timeout: 60

Run the following command to invoke the function:

s invoke -e "hello"

Sample output:

[2021-09-09T10:15:54.604] [INFO ] [S-CLI] - Start ...
========= FC invoke Logs begin =========
FC Initialize Start RequestId: 1ebb693d-86c6-4832-b5ea-034033fef2f2
init
FC Initialize End RequestId: 1ebb693d-86c6-4832-b5ea-034033fef2f2
FC Invoke Start RequestId: 1ebb693d-86c6-4832-b5ea-034033fef2f2
hello
FC Invoke End RequestId: 1ebb693d-86c6-4832-b5ea-034033fef2f2

Duration: 5.07 ms, Billed Duration: 6 ms, Memory Size: 1024 MB, Max Memory Used: 15.06 MB
========= FC invoke Logs end =========

FC Invoke Result:
OK


End of method: invoke