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From "Devansh Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (THRIFT-4221) Add Rails like Before Action to Thrift
Date Sat, 03 Jun 2017 13:59:04 GMT

     [ https://issues.apache.org/jira/browse/THRIFT-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Devansh Gupta updated THRIFT-4221:
----------------------------------
    Attachment: t_go_generator.diff
                golang_generated.diff

> Add Rails like Before Action to Thrift
> --------------------------------------
>
>                 Key: THRIFT-4221
>                 URL: https://issues.apache.org/jira/browse/THRIFT-4221
>             Project: Thrift
>          Issue Type: New Feature
>          Components: Wish List
>    Affects Versions: 1.0
>            Reporter: Devansh Gupta
>              Labels: patch
>             Fix For: 1.0
>
>         Attachments: golang_generated.diff, t_go_generator.diff
>
>
> One issue that comes up often is when we have a service defined with some functions and
we want to do Authentication & Authorization we need to manually call a function from
inside the service implementation every time.
> See:
> https://stackoverflow.com/questions/4621715/how-to-handle-authentication-and-authorization-with-thrift
> A decently popular question.
> This ticket proposes to add a _before_action_ (naming flexible) hook which will be called
before the Service call method is executed. It can _only_ raise the same errors as defined
by the function.
> Example diff for Golang generated code for simple service:
> {code}
> exception NotAuthorisedException {
>     1: string errorMessage,
> }
> exception ApiException {
>     1: string errorMessage,
> }
> service MyService {
>     string myMethod(1: string authString, 2: string otherArgs ) throws ( 1: NotAuthorisedException
e1, 2: ApiException e ),
> }
> {code}
> {code}
> +       // Called before any other action is called
> +       BeforeAction(serviceName string, actionName string, args map[string]interface{})
(err error)
> +       // Called if an action returned an error
> +       ProcessError(err error) error
>  }
>  type MyServiceClient struct {
> @@ -391,7 +395,12 @@ func (p *myServiceProcessorMyMethod) Process(seqId int32, iprot,
oprot thrift.TP
>         result := MyServiceMyMethodResult{}
>         var retval string
>         var err2 error
> -       if retval, err2 = p.handler.MyMethod(args.AuthString, args.OtherArgs_); err2
!= nil {
> +       err2 = p.handler.BeforeAction("MyService", "MyMethod", map[string]interface{}{"AuthString":
args.AuthString, "OtherArgs_": args.OtherArgs_})
> +       if err2 == nil {
> +               retval, err2 = p.handler.MyMethod(args.AuthString, args.OtherArgs_)
> +       }
> +       if err2 != nil {
> +               err2 = p.handler.ProcessError(err2)
> {code}
> It simply calls BeforeAction, if it raises an error it does NOT procede with making the
normal call.
> Diffs Attached.
>  



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