Hijack (Hi Jack!)

Hijack lets you hijack graphql requests on the fly and return custom responses based on operation being fired.

Examples:

hijack/hijack_example_test.go

Lines 25 to 48 in 2918aa4

	defer hijack.Start(func(r *request.GraphqlRequest) (string, error) {
	return `{
	"data": {
	"character": {
	"id": "11 (Mock)",
	"name": "Albert Einstein (from mock)",
	"status": "Alive (mock)"
	}
	}
	}`, nil
	}, "rickandmortyapi.com")()
	client := graphql.NewClient("https://rickandmortyapi.com/graphql")
	request := graphql.NewRequest(`query GetCharacterByID{ character(id:"11"){id, name, status }}`)
	response := OperationResult{}
	_ = client.Run(context.Background(), request, &response)
	fmt.Println(response.Character.ID)
	fmt.Println(response.Character.Name)
	fmt.Println(response.Character.Status)
	//Output:11 (Mock)
	// Albert Einstein (from mock)
	// Alive (mock)
	}

hijack/hijack_example_test.go

Lines 50 to 80 in 2918aa4

	func ExampleStart_2() { //nolint:govet
	h := handlers.New()
	h.Set("GetCharacterByID", func(r *request.GraphqlRequest) (string, error) {
	return `{
	"data": {
	"character": {
	"id": "11 (Mock)",
	"name": "Albert Einstein (from mock)",
	"status": "Alive (mock)"
	}
	}
	}`, nil
	})
	h.Set("BadOperation", func(r *request.GraphqlRequest) (string, error) {
	return "", errors.New("error")
	})
	defer hijack.Start(h.Handle, "rickandmortyapi.com")()
	client := graphql.NewClient("https://rickandmortyapi.com/graphql")
	request := graphql.NewRequest(`query GetCharacterByID{ character(id:"11"){id, name, status }}`)
	response := OperationResult{}
	_ = client.Run(context.Background(), request, &response)
	fmt.Println(response.Character.ID)
	fmt.Println(response.Character.Name)
	fmt.Println(response.Character.Status)
	//Output:11 (Mock)
	// Albert Einstein (from mock)
	// Alive (mock)
	}

hijack/hijack_example_test.go

Lines 82 to 138 in 2918aa4

	func Example_AssertVariablesInRequest() { //nolint:govet
	h := handlers.New()
	h.Set("GetCharacterByID", func(r *request.GraphqlRequest) (string, error) {
	id, err := hijack.GetVariableAs[string](r, "id")
	if err != nil {
	return "", err
	}
	if id == "12" {
	return `
	{
	"data": {},
	"errors": [
	{
	"message": "Character with ID 12 not found."
	}
	]
	}`, nil
	}
	return `{
	"data": {
	"character": {
	"id": "11 (Mock)",
	"name": "Albert Einstein (from mock)",
	"status": "Alive (mock)"
	}
	}
	}`, nil
	})
	defer hijack.Start(h.Handle, "rickandmortyapi.com")()
	client := graphql.NewClient("https://rickandmortyapi.com/graphql")
	request := graphql.NewRequest(`query GetCharacterByID($id: ID){ character(id:$id){id, name, status }}`)
	request.Var("id", "12")
	response := OperationResult{}
	fmt.Println("Fetching non-existing character...")
	err := client.Run(context.Background(), request, &response)
	fmt.Println(err)
	request = graphql.NewRequest(`query GetCharacterByID($id: ID){ character(id:$id){id, name, status }}`)
	request.Var("id", "11")
	response = OperationResult{}
	fmt.Println("Fetching existing character...")
	err = client.Run(context.Background(), request, &response)
	if err != nil {
	log.Fatal("unexpected error:", err)
	}
	fmt.Println(response.Character.ID)
	fmt.Println(response.Character.Name)
	fmt.Println(response.Character.Status)
	//Output: Fetching non-existing character...
	//graphql: Character with ID 12 not found.
	//Fetching existing character...
	//11 (Mock)
	//Albert Einstein (from mock)
	//Alive (mock)
	}

Planned Features (PRs welcome)

• fixtures support