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https://issues.apache.org/jira/browse/THRIFT-4617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595313#comment-16595313
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ASF GitHub Bot commented on THRIFT-4617:
----------------------------------------
flavray commented on a change in pull request #1578: THRIFT-4617: Prepend
service-specific struct names with service name
URL: https://github.com/apache/thrift/pull/1578#discussion_r213397463
##########
File path: compiler/cpp/src/thrift/generate/t_rs_generator.cc
##########
@@ -350,6 +350,7 @@ class t_rs_generator : public t_generator {
void render_sync_handler_failed_default_exception_branch(t_function *tfunc);
void render_sync_handler_send_exception_response(t_function *tfunc, const
string &err_var);
void render_service_call_structs(t_service* tservice);
+ void render_args_struct(t_function* tfunc);
Review comment:
`render_service_call_args_struct` sounds good to me! I'll also change
`render_result_value_struct` into `render_service_call_result_value_struct` to
stay consistent 🙂
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> Avoid generating conflicting struct names in Rust code
> ------------------------------------------------------
>
> Key: THRIFT-4617
> URL: https://issues.apache.org/jira/browse/THRIFT-4617
> Project: Thrift
> Issue Type: Bug
> Components: Rust - Compiler
> Reporter: Flavien Raynaud
> Priority: Minor
> Fix For: 0.12.0
>
>
> If a thrift definition file contains multiple services, with functions having
> the same name, the generated code is not valid. There are conflicting
> definitions of {{*Args}} and {{*Result}} structs.
> {noformat}
> service backend {
> i32 send(
> 1: i32 arg
> );
> }
> service other_backend {
> string send(
> 1: i32 arg
> )
> }
> {noformat}
> Will generate the following code in the same file (I only pasted the
> interesting bits):
> {noformat}
> struct SendResult {
> result_value: Option<i32>,
> }
> // ...
> struct SendResult {
> result_value: Option<String>,
> }
> {noformat}
> And rustc would complain with errors like:
> {noformat}
> error[E0428]: the name `SendResult` is defined multiple times
> --> src/test.rs:496:1
> |
> 234 | struct SendResult {
> | ----------------- previous definition of the type `SendResult` here
> ...
> 496 | struct SendResult {
> | ^^^^^^^^^^^^^^^^^ `SendResult` redefined here
> |
> = note: `SendResult` must be defined only once in the type namespace of
> this module
> {noformat}
> ----
> Another (very similar) issue occurs if a user-defined struct happens to be
> called (keeping the same example as before) {{SendResult}}:
> {noformat}
> struct SendResult {
> 1: i32 resultCode,
> 2: optional string errorCause,
> }
> service backend {
> SendResult send(
> 1: i32 arg
> );
> }
> {noformat}
> Will generate the following code in the same file (I only pasted the
> interesting bits)::
> {noformat}
> pub struct SendResult {
> pub result_code: Option<i32>,
> pub error_cause: Option<String>,
> }
> // ...
> struct SendResult {
> result_value: Option<SendResult>,
> }
> {noformat}
> Again, conflicting definitions of structs and rustc would complain.
> ----
> The approach taken by the Go generator (I haven't looked at other languages
> too much, some other generators probably do the same) for generating internal
> structs related to a service call is to [prepend the service
> name|https://github.com/apache/thrift/blob/master/compiler/cpp/src/thrift/generate/t_go_generator.cc#L502]
> to each of the structs.
> Using the same mechanism would solve both the issues cited above.
> I will give it a try and open a PR, but am also definitely open to any
> feedback on the idea :)
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