Developing Functions in Go

Function Syntax

• Handler: name of the function that FunctionGraph invokes to execute your code. The name must be consistent with that you define when creating a function, and must start with an uppercase letter.
• payload: event parameter defined for the function. The parameter is in JSON format.
• ctx: runtime information provided for executing the function. For details, see SDK APIs.

SDK APIs

• Context APIs

  The Go SDK provides multiple context APIs and a logging API. The download link of the Go SDK is provided in Table 1. Table 1 describes the context APIs provided by FunctionGraph.

  Table 1 Context methods

  Method	Description
  GetRequestID() string	Obtains a request ID.
  GetRemainingTimeInMilliSeconds()	Obtains the remaining running time of a function.
  GetAccessKey() string	Obtains the AK (valid for 24 hours) of an agency. If you use this method, you need to configure an agency for the function. NOTE: FunctionGraph has stopped maintaining the getAccessKey API in the Runtime SDK. You cannot use this API to obtain a temporary AK.
  GetSecretKey() string	Obtains the SK (valid for 24 hours) of an agency. If you use this method, you need to configure an agency for the function. NOTE: FunctionGraph has stopped maintaining the getSecretKey API in the Runtime SDK. You cannot use this API to obtain a temporary SK.
  getSecurityAccessKey()	Obtains the SecurityAccessKey (valid for 24 hours) with an agency. If you use this method, you need to configure an agency for the function.
  getSecuritySecretKey()	Obtains the SecuritySecretKey (valid for 24 hours) with an agency. If you use this method, you need to configure an agency for the function.
  getSecurityToken()	Obtains the SecurityToken (valid for 24 hours) with an agency. If you use this method, you need to configure an agency for the function.
  GetUserData(key string) string	Uses keys to obtain the values passed by environment variables.
  GetFunctionName() string	Obtains the name of a function.
  GetRunningTimeInSeconds() int	Obtains the timeout of a function.
  GetVersion() string	Obtains the version of a function.
  GetMemorySize() int	Obtains the allocated memory.
  GetCPUNumber() int	Obtains CPU usage of a function.
  GetProjectID() string	Obtains a project ID.
  GetPackage() string	Obtains a function group, that is, an app.
  GetToken() string	Obtains the token (valid for 24 hours) of an agency. If you use this method, you need to configure an agency for the function.
  GetLogger() context.RuntimeLogger	Obtains the logger method provided by the context. By default, information such as the time and request ID is output.

  Notice

  Results returned by using the GetToken(), GetAccessKey(), and GetSecretKey() methods contain sensitive information. Exercise caution when using these methods.

Execution Result

{
    "errorMessage": "", 
    "errorType":"", 
}