65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
package httpdelivery
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import (
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"fmt"
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"time"
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"github.com/99designs/gqlgen/graphql/handler"
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"github.com/99designs/gqlgen/graphql/handler/extension"
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"github.com/99designs/gqlgen/graphql/handler/lru"
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"github.com/99designs/gqlgen/graphql/handler/transport"
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"github.com/99designs/gqlgen/graphql/playground"
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"github.com/gin-gonic/gin"
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"github.com/tribalwarshelp/api/graphql/generated"
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"github.com/tribalwarshelp/api/graphql/resolvers"
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)
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const (
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playgroundTTL = time.Hour / time.Second
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)
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type Config struct {
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RouterGroup *gin.RouterGroup
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Resolver *resolvers.Resolver
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}
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func Attach(cfg Config) error {
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if cfg.Resolver == nil {
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return fmt.Errorf("Graphql resolver cannot be nil")
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}
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gqlHandler := graphqlHandler(cfg.Resolver)
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cfg.RouterGroup.GET("/graphql", gqlHandler)
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cfg.RouterGroup.POST("/graphql", gqlHandler)
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cfg.RouterGroup.GET("/", playgroundHandler())
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return nil
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}
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// Defining the GraphQL handler
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func graphqlHandler(r *resolvers.Resolver) gin.HandlerFunc {
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cfg := generated.Config{Resolvers: r}
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srv := handler.New(generated.NewExecutableSchema(cfg))
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srv.AddTransport(transport.GET{})
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srv.AddTransport(transport.POST{})
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srv.AddTransport(transport.MultipartForm{})
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srv.Use(extension.Introspection{})
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srv.Use(extension.AutomaticPersistedQuery{
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Cache: lru.New(100),
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})
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return func(c *gin.Context) {
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c.Header("Cache-Control", "no-store, must-revalidate")
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srv.ServeHTTP(c.Writer, c.Request)
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}
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}
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// Defining the Playground handler
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func playgroundHandler() gin.HandlerFunc {
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h := playground.Handler("Playground", "/graphql")
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return func(c *gin.Context) {
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c.Header("Cache-Control", fmt.Sprintf(`public, must-revalidate, max-age=%d, s-maxage=%d`, playgroundTTL, playgroundTTL))
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h.ServeHTTP(c.Writer, c.Request)
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}
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}
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