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Use RequestCallbackFn to manage ctx, customise HTTP-headers and use DataLoader #1

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Use RequestCallbackFn to manage ctx, customise HTTP-headers and use DataLoader #1

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42 changes: 14 additions & 28 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ import (

"github.com/graph-gophers/dataloader"
"github.com/graphql-go/graphql"
"github.com/graphql-go/handler"
"github.com/michurin/handler"
"github.com/mxk/go-sqlite/sqlite3"
)

Expand Down Expand Up @@ -62,35 +62,20 @@ func sql(sql string) []sqlite3.RowMap {
return result
}

// ----- http -----

type gtHandler struct {
origHandler http.Handler
}
// ----- util -----

func (h *gtHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// you can set you own header for tracing etc
w.Header().Add("X-Michurin", "Here!")
// hacks for graphql-cli
func requestCallbackFn(ctx context.Context, w http.ResponseWriter, r *http.Request) context.Context {
w.Header().Add("X-Michurin", "Ok")
if origin := r.Header.Get("Origin"); origin != "" {
w.Header().Add("Access-Control-Allow-Origin", origin)
}
w.Header().Add("Access-Control-Allow-Headers", "Content-Type,X-Apollo-Tracing")
if r.Method == http.MethodOptions {
// just call for schema
h.origHandler.ServeHTTP(w, r)
} else {
// fill request context
h.origHandler.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "dataloaders", NewLoaders())))
if r.Method != http.MethodOptions {
ctx = context.WithValue(ctx, "dataloaders", NewLoaders())
}
return ctx
}

func handlerWrapper(h http.Handler) *gtHandler {
return &gtHandler{h}
}

// ----- util -----

func getLoaderFnByName(p graphql.ResolveParams, name string, key dataloader.Key) dataloader.Thunk {
return p.Context.Value("dataloaders").(map[string]*dataloader.Loader)[name].Load(p.Context, key)
}
Expand Down Expand Up @@ -490,12 +475,13 @@ func main() {
panic(err)
}

handler := handlerWrapper(handler.New(&handler.Config{
Schema: &schema,
Pretty: true,
GraphiQL: true,
Playground: true,
}))
handler := handler.New(&handler.Config{
Schema: &schema,
Pretty: true,
GraphiQL: true,
Playground: true,
RequestCallbackFn: requestCallbackFn,
})
http.Handle("/gql", handler)

fmt.Println(`
Expand Down