38 lines
955 B
Go
38 lines
955 B
Go
package middleware
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import (
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"context"
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"github.com/pkg/errors"
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"net/http"
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"gitea.dwysokinski.me/zdam-egzamin-zawodowy/backend/internal/graphql/dataloader"
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)
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var (
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dataLoaderToContext contextKey = "data_loader"
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)
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func DataLoaderToContext(cfg dataloader.Config) func(next http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := context.WithValue(r.Context(), dataLoaderToContext, dataloader.New(cfg))
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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}
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func DataLoaderFromContext(ctx context.Context) (*dataloader.DataLoader, error) {
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dataLoader := ctx.Value(dataLoaderToContext)
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if dataLoader == nil {
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err := errors.New("couldn't retrieve dataloader.DataLoader")
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return nil, err
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}
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dl, ok := dataLoader.(*dataloader.DataLoader)
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if !ok {
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err := errors.New("dataloader.DataLoader has wrong type")
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return nil, err
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}
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return dl, nil
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}
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