To set a timeout for each gRPC call and add metadata to the client, you can use the context.WithTimeout
function and the metadata.NewOutgoingContext
function in combination.
Here’s an example:
import (
"context"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
func main() {
// create a connection to the gRPC server
conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())
if err != nil {
// handle error
}
defer conn.Close()
// create a new gRPC client with the connection
client := mypb.NewMyServiceClient(conn)
// set a timeout for each gRPC call
ctxTimeout, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
// add metadata to the client
md := metadata.Pairs(
"authorization", "Bearer mytoken",
"request-id", "12345",
)
ctxMetadata := metadata.NewOutgoingContext(ctxTimeout, md)
// make a gRPC call with the timeout and metadata
resp, err := client.MyMethod(ctxMetadata, &mypb.MyRequest{})
if err != nil {
// handle error
}
// process response
}
In this example, we create a new gRPC client with a connection to the server. We then set a timeout of 5 seconds for each gRPC call using context.WithTimeout
. We also add metadata to the client using metadata.NewOutgoingContext
, which takes the timeout context as its first argument and the metadata as its second argument.
Finally, we make a gRPC call to a hypothetical MyMethod
method on the server, passing in the metadata context as well as a request message. If there is an error, we handle it appropriately. If the call is successful, we process the response as needed.