Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


Alanxtl commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4608837042

   Sorry, I took another look and realized this is not actually a bug in the 
way I originally described.
   
   The metadata service protocol is recorded in the service instance metadata, 
and the registry itself does not need to understand or be compatible with the 
metadata RPC protocol. The consumer just needs the corresponding protocol 
capability when it calls the provider metadata service.
   
   So this is more about sample/import setup than a framework bug. I’ll close 
this issue and the related PR. Thanks for looking into it and sorry for the 
confusion.


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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


Alanxtl closed pull request #3364: fix(metadata): improve error message when 
protocol is missing
URL: https://github.com/apache/dubbo-go/pull/3364


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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


sonarqubecloud[bot] commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4603742042

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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


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URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4603671261

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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


wlgusqkr commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4603592208

   @Alanxtl Thanks for the guidance! I've updated the PR to follow this 
direction.
   
   I reverted the `GetProtocolWithError` / metadata import-hint change and 
added a side-effect import of `protocol/dubbo` in `registry/servicediscovery`, 
so application-level service discovery registers its internal metadata 
transport dependency automatically.
   
   I kept the code change minimal and did not add a test in this revision. I 
considered adding an isolated import test under something like 
`registry/servicediscovery/importtest`, because an in-package test under 
`registry/servicediscovery` can be affected by existing tests that call 
`extension.SetProtocol("dubbo", ...)` with a mock protocol.
   
   Do you think adding that isolated import test is worthwhile here, or would 
you prefer keeping this as the minimal side-effect import change?


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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


sonarqubecloud[bot] commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4603579474

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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


Copilot commented on code in PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#discussion_r3340744025


##
metadata/client.go:
##
@@ -53,7 +53,15 @@ func GetMetadataFromMetadataReport(revision string, instance 
registry.ServiceIns
 func GetMetadataFromRpc(revision string, instance registry.ServiceInstance) 
(*info.MetadataInfo, error) {
url := buildStandardMetadataServiceURL(instance)
url.SetParam(constant.TimeoutKey, defaultTimeout)
-   p := extension.GetProtocol(url.Protocol)
+   p, err := extension.GetProtocolWithError(url.Protocol)

Review Comment:
   `buildStandardMetadataServiceURL` can return nil when the instance metadata 
doesn't contain a protocol (see `buildStandardMetadataServiceURL` returning nil 
when `ps[constant.ProtocolKey] == ""`). `GetMetadataFromRpc` dereferences `url` 
immediately (`url.SetParam(...)`), which will still panic on that path. 
Consider returning a descriptive error instead so missing/invalid metadata 
doesn't crash the consumer.



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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


Alanxtl commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4601531507

   
   Thanks for working on this, but I think we should not fix this by improving 
the error message.
   
   The issue is not that the error is unclear. The issue is that REST 
application-level service discovery leaks an internal metadata transport 
dependency to user code.
   
   For a REST consumer, users configure and import REST-related components:
   
   ```go
   _ "dubbo.apache.org/dubbo-go/v3/protocol/rest"
   _ "dubbo.apache.org/dubbo-go/v3/registry/servicediscovery"
   ```
   
   But application-level discovery internally fetches metadata through:
   
   ```text
   dubbo://.../org.apache.dubbo.metadata.MetadataService
   ```
   
   So today the consumer also has to manually import:
   
   ```go
   _ "dubbo.apache.org/dubbo-go/v3/protocol/dubbo"
   ```
   
   That should not be required. The Dubbo protocol here is an internal 
metadata-service transport detail.
   
   I suggest changing the fix direction:
   
   1. Revert the new `GetProtocolWithError` / metadata-specific import hint 
change.
   2. Make application-level service discovery register its internal metadata 
transport dependency automatically.
   3. Add a test proving that a REST consumer using service discovery works 
without importing `protocol/dubbo`.
   
   A minimal fix may be to add a side-effect import in the service discovery 
package:
   
   ```go
   import (
   _ "dubbo.apache.org/dubbo-go/v3/protocol/dubbo"
   )
   ```
   
   Probably `registry/servicediscovery` is a reasonable place, because that is 
the feature path that calls `metadata.GetMetadataFromRpc(...)` and requires the 
default Dubbo metadata protocol.
   
   The expected test should cover:
   
   - provider protocol: REST;
   - registry type: application-level service discovery;
   - consumer imports REST protocol and service discovery packages;
   - consumer does **not** import `dubbo.apache.org/dubbo-go/v3/protocol/dubbo`;
   - metadata is still fetched and the REST provider URL is reconstructed 
successfully.
   
   So I would prefer fixing the dependency registration instead of returning a 
clearer error that still asks REST users to import Dubbo manually.


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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


sonarqubecloud[bot] commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4601462911

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Re: [PR] fix(metadata): improve error message when protocol is missing [dubbo-go]

2026-06-02 Thread via GitHub


Alanxtl commented on PR #3364:
URL: https://github.com/apache/dubbo-go/pull/3364#issuecomment-4601445747

   our project use `import-formatter` to format import blocks, that's the 
reason why ur CI fails. For you, u should 
   
   1. run `go install github.com/dubbogo/tools/cmd/imports-formatter@latest`
   2. cd to the root dir of `dubbo-go`
   3. run `imports-formatter`


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