marsevilspirit commented on PR #2928:
URL: https://github.com/apache/dubbo-go/pull/2928#issuecomment-3050974106
@ziyyun I have tested using ctx to pass attachments directly, and the effect
is very good.
I think this PR can be merged directly.
client:
```go
package main
import (
"context"
"dubbo.apache.org/dubbo-go/v3/client"
"dubbo.apache.org/dubbo-go/v3/common/constant"
_ "dubbo.apache.org/dubbo-go/v3/imports"
greet "github.com/apache/dubbo-go-samples/helloworld/proto"
"github.com/dubbogo/gost/log/logger"
)
func main() {
cli, err := client.NewClient(
client.WithClientURL("127.0.0.1:20000"),
)
if err != nil {
panic(err)
}
svc, err := greet.NewGreetService(cli)
if err != nil {
panic(err)
}
ctx := context.Background()
ctx = context.WithValue(ctx, constant.AttachmentKey,
map[string]any{"foo": "bar"})
resp, err := svc.Greet(ctx, &greet.GreetRequest{Name: "hello world"})
if err != nil {
logger.Error(err)
}
logger.Infof("Greet response: %s", resp.Greeting)
}
```
server:
```go
package main
import (
"context"
"dubbo.apache.org/dubbo-go/v3/common/constant"
_ "dubbo.apache.org/dubbo-go/v3/imports"
"dubbo.apache.org/dubbo-go/v3/protocol"
"dubbo.apache.org/dubbo-go/v3/server"
greet "github.com/apache/dubbo-go-samples/helloworld/proto"
"github.com/dubbogo/gost/log/logger"
)
type GreetTripleServer struct {
}
func (srv *GreetTripleServer) Greet(ctx context.Context, req
*greet.GreetRequest) (*greet.GreetResponse, error) {
attachments := ctx.Value(constant.AttachmentKey).(map[string]any)
logger.Infof("attachments : %v", attachments)
logger.Infof("attachments[foo] : %v", attachments["foo"])
resp := &greet.GreetResponse{Greeting: req.Name}
return resp, nil
}
func main() {
srv, err := server.NewServer(
server.WithServerProtocol(
protocol.WithPort(20000),
protocol.WithTriple(),
),
)
if err != nil {
panic(err)
}
if err := greet.RegisterGreetServiceHandler(srv, &GreetTripleServer{});
err != nil {
panic(err)
}
if err := srv.Serve(); err != nil {
logger.Error(err)
}
}
```
For the **context** you are worried about that there have an attachmentkey.
Different protocols do indeed have different processing logic, but the user
will not perceive it, so there is no need to worry.
``` mermaid
---
config:
look: handDrawn
theme: neutral
---
flowchart LR
start[Start] --> protocol{Protocol}
protocol -->|Triple| infoProxy[infoProxyInvoker]
protocol -->|Dubbo| proxy[ProxyInvoker]
infoProxy --> handleTriAttachments
proxy --> handleDubboAttachments
```
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