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interceptor.go
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interceptor.go
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package interceptor
import (
"context"
"net/http"
"github.com/sergiusd/redbus/internal/pkg/db"
"google.golang.org/grpc"
)
// DBClientProvider is a func for wrapping database
type DBClientProvider func(ctx context.Context) db.IClient
// UnaryServerInterceptor wrap endpoint with middleware mixing in db connection
func UnaryServerInterceptor(dbClientProvider DBClientProvider, option ...db.Option) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
return handler(db.AddToContext(ctx, dbClientProvider(ctx)), req)
}
}
// UnaryServerInterceptor wrap endpoint with middleware mixing in db connection
func StreamServerInterceptor(dbClientProvider DBClientProvider, option ...db.Option) grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
ctx := stream.Context()
wrapper := &streamWrapper{
ctx: db.AddToContext(ctx, dbClientProvider(ctx)),
ServerStream: stream,
}
return handler(srv, wrapper)
}
}
type streamWrapper struct {
ctx context.Context
grpc.ServerStream
}
func (w *streamWrapper) Context() context.Context {
return w.ctx
}
// ServerMiddleware wrap endpoint with middleware mixing in db connection
func ServerMiddleware(dbClientProvider DBClientProvider, option ...db.Option) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
r = r.WithContext(db.AddToContext(ctx, dbClientProvider(ctx)))
next.ServeHTTP(w, r)
})
}
}