37 lines
864 B
Go
37 lines
864 B
Go
package middleware
|
|
|
|
import (
|
|
"context"
|
|
"github.com/pkg/errors"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
"github.com/zdam-egzamin-zawodowy/backend/internal/graphql/dataloader"
|
|
)
|
|
|
|
var (
|
|
dataLoaderToContext contextKey = "data_loader"
|
|
)
|
|
|
|
func DataLoaderToContext(cfg dataloader.Config) gin.HandlerFunc {
|
|
return func(c *gin.Context) {
|
|
ctx := context.WithValue(c.Request.Context(), dataLoaderToContext, dataloader.New(cfg))
|
|
c.Request = c.Request.WithContext(ctx)
|
|
c.Next()
|
|
}
|
|
}
|
|
|
|
func DataLoaderFromContext(ctx context.Context) (*dataloader.DataLoader, error) {
|
|
dataLoader := ctx.Value(dataLoaderToContext)
|
|
if dataLoader == nil {
|
|
err := errors.New("couldn't retrieve dataloader.DataLoader")
|
|
return nil, err
|
|
}
|
|
|
|
dl, ok := dataLoader.(*dataloader.DataLoader)
|
|
if !ok {
|
|
err := errors.New("dataloader.DataLoader has wrong type")
|
|
return nil, err
|
|
}
|
|
return dl, nil
|
|
}
|